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Diffstat (limited to 'src/pugixml.cpp')
| -rw-r--r-- | src/pugixml.cpp | 3851 |
1 files changed, 3851 insertions, 0 deletions
diff --git a/src/pugixml.cpp b/src/pugixml.cpp index d319069..db9564c 100644 --- a/src/pugixml.cpp +++ b/src/pugixml.cpp @@ -4496,6 +4496,3857 @@ namespace std } #endif +#ifndef PUGIXML_NO_XPATH + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <assert.h> +#include <setjmp.h> +#include <ctype.h> +#include <math.h> +#include <float.h> + +#ifdef PUGIXML_WCHAR_MODE +# include <wchar.h> +#endif + +#include <new> + +#ifndef PUGIXML_NO_STL +# include <string> +#endif + +// int32_t +#if !defined(_MSC_VER) || _MSC_VER >= 1600 +# include <stdint.h> +#else +typedef __int32 int32_t; +#endif + +#if defined(_MSC_VER) +# pragma warning(disable: 4127) // conditional expression is constant +# pragma warning(disable: 4324) // structure was padded due to __declspec(align()) +# pragma warning(disable: 4611) // interaction between '_setjmp' and C++ object destruction is non-portable +# pragma warning(disable: 4702) // unreachable code +# pragma warning(disable: 4996) // this function or variable may be unsafe +#endif + +#ifdef __INTEL_COMPILER +# pragma warning(disable: 1478 1786) // function was declared "deprecated" +#endif + +#ifdef __SNC__ +# pragma diag_suppress=237 // controlling expression is constant +#endif + +// String utilities prototypes +namespace pugi +{ + namespace impl + { + size_t strlen(const char_t* s); + bool strequal(const char_t* src, const char_t* dst); + bool strequalrange(const char_t* lhs, const char_t* rhs, size_t count); + void widen_ascii(wchar_t* dest, const char* source); + } +} + +// STL replacements +namespace pstd +{ + struct equal_to + { + template <typename T> bool operator()(const T& lhs, const T& rhs) const + { + return lhs == rhs; + } + }; + + struct not_equal_to + { + template <typename T> bool operator()(const T& lhs, const T& rhs) const + { + return lhs != rhs; + } + }; + + struct less + { + template <typename T> bool operator()(const T& lhs, const T& rhs) const + { + return lhs < rhs; + } + }; + + struct less_equal + { + template <typename T> bool operator()(const T& lhs, const T& rhs) const + { + return lhs <= rhs; + } + }; + + template <typename T> void swap(T& lhs, T& rhs) + { + T temp = lhs; + lhs = rhs; + rhs = temp; + } + + template <typename I, typename J> void copy(I begin, I end, J target) + { + while (begin != end) *target++ = *begin++; + } + + template <typename I, typename T> I find(I begin, I end, T elem) + { + for (I it = begin; it != end; ++it) + if (*it == elem) + return it; + + return end; + } + + template <typename I, typename Pred> I min_element(I begin, I end, const Pred& pred) + { + I result = begin; + + for (I it = begin + 1; it != end; ++it) + if (pred(*it, *result)) + result = it; + + return result; + } + + template <typename I> void reverse(I begin, I end) + { + while (begin + 1 < end) swap(*begin++, *--end); + } + + template <typename I> I unique(I begin, I end) + { + // fast skip head + while (begin + 1 < end && *begin != *(begin + 1)) begin++; + + if (begin == end) return begin; + + // last written element + I write = begin++; + + // merge unique elements + while (begin != end) + { + if (*begin != *write) + *++write = *begin++; + else + begin++; + } + + // past-the-end (write points to live element) + return write + 1; + } + + template <typename I, typename Pred> void sort(I begin, I end, const Pred& pred) + { + while (begin != end) swap(*begin, *min_element(begin, end, pred)), begin++; + } +} + +namespace +{ + using namespace pugi; + + class xpath_string + { + const char_t* _buffer; + bool _uses_heap; + + static char_t* duplicate_string(const char_t* string, size_t length) + { + char_t* result = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t))); + if (!result) return 0; // $$ out of memory + + memcpy(result, string, length * sizeof(char_t)); + result[length] = 0; + + return result; + } + + static char_t* duplicate_string(const char_t* string) + { + return duplicate_string(string, impl::strlen(string)); + } + + public: + xpath_string(): _buffer(PUGIXML_TEXT("")), _uses_heap(false) + { + } + + ~xpath_string() + { + if (_uses_heap) get_memory_deallocation_function()(const_cast<char_t*>(_buffer)); + } + + explicit xpath_string(const char_t* str) + { + bool empty = (*str == 0); + + _buffer = empty ? PUGIXML_TEXT("") : duplicate_string(str); + _uses_heap = !empty; + } + + explicit xpath_string(const char_t* str, bool use_heap): _buffer(str), _uses_heap(use_heap) + { + } + + xpath_string(const char_t* begin, const char_t* end) + { + assert(begin <= end); + + if (begin != end) + { + _buffer = duplicate_string(begin, static_cast<size_t>(end - begin)); + _uses_heap = true; + } + else + { + _buffer = PUGIXML_TEXT(""); + _uses_heap = false; + } + } + + xpath_string(const xpath_string& o) + { + _buffer = o._uses_heap ? duplicate_string(o._buffer) : o._buffer; + _uses_heap = o._uses_heap; + } + + xpath_string& operator=(const xpath_string& o) + { + xpath_string temp(o); + swap(temp); + + return *this; + } + + void swap(xpath_string& o) + { + pstd::swap(_buffer, o._buffer); + pstd::swap(_uses_heap, o._uses_heap); + } + + void append(const xpath_string& o) + { + // skip empty sources + if (!*o._buffer) return; + + // fast append for empty target and constant source + if (!*_buffer && !o._uses_heap) + { + _buffer = o._buffer; + _uses_heap = false; + } + else + { + // need to make heap copy + size_t target_length = impl::strlen(_buffer); + size_t source_length = impl::strlen(o._buffer); + size_t length = target_length + source_length; + + // allocate new buffer + char_t* result = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t))); + if (!result) return; // $$ out of memory + + // append both strings in the new buffer + memcpy(result, _buffer, target_length * sizeof(char_t)); + memcpy(result + target_length, o._buffer, source_length * sizeof(char_t)); + result[length] = 0; + + // finalize + xpath_string(result, true).swap(*this); + } + } + + const char_t* c_str() const + { + return _buffer; + } + + size_t length() const + { + return impl::strlen(_buffer); + } + + char_t* data() + { + // make private heap copy + if (!_uses_heap) + { + _buffer = duplicate_string(_buffer); + _uses_heap = true; + } + + return const_cast<char_t*>(_buffer); + } + + bool empty() const + { + return *_buffer == 0; + } + + bool operator==(const xpath_string& o) const + { + return impl::strequal(_buffer, o._buffer); + } + + bool operator!=(const xpath_string& o) const + { + return !impl::strequal(_buffer, o._buffer); + } + }; + + xpath_string xpath_string_const(const char_t* str) + { + return xpath_string(str, false); + } +} + +namespace +{ + using namespace pugi; + + enum chartypex + { + ctx_space = 1, // \r, \n, space, tab + ctx_start_symbol = 2, // Any symbol > 127, a-z, A-Z, _ + ctx_digit = 4, // 0-9 + ctx_symbol = 8 // Any symbol > 127, a-z, A-Z, 0-9, _, -, . + }; + + const unsigned char chartypex_table[256] = + { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, // 0-15 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16-31 + 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 0, // 32-47 + 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 0, 0, 0, 0, 0, 0, // 48-63 + 0, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, // 64-79 + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 0, 0, 0, 0, 10, // 80-95 + 0, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, // 96-111 + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 0, 0, 0, 0, 0, // 112-127 + + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, // 128+ + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 + }; + +#ifdef PUGIXML_WCHAR_MODE + #define IS_CHARTYPEX(c, ct) ((static_cast<unsigned int>(c) < 128 ? chartypex_table[static_cast<unsigned int>(c)] : chartypex_table[128]) & (ct)) +#else + #define IS_CHARTYPEX(c, ct) (chartypex_table[static_cast<unsigned char>(c)] & (ct)) +#endif + + bool starts_with(const char_t* string, const char_t* pattern) + { + while (*pattern && *string == *pattern) + { + string++; + pattern++; + } + + return *pattern == 0; + } + + const char_t* find_char(const char_t* s, char_t c) + { + #ifdef PUGIXML_WCHAR_MODE + return wcschr(s, c); + #else + return strchr(s, c); + #endif + } + + const char_t* find_substring(const char_t* s, const char_t* p) + { + #ifdef PUGIXML_WCHAR_MODE + return wcsstr(s, p); + #else + return strstr(s, p); + #endif + } + + xpath_string string_value(const xpath_node& na) + { + if (na.attribute()) + return xpath_string_const(na.attribute().value()); + else + { + const xml_node& n = na.node(); + + switch (n.type()) + { + case node_pcdata: + case node_cdata: + case node_comment: + case node_pi: + return xpath_string_const(n.value()); + + case node_document: + case node_element: + { + xpath_string result; + + xml_node cur = n.first_child(); + + while (cur && cur != n) + { + if (cur.type() == node_pcdata || cur.type() == node_cdata) + result.append(xpath_string_const(cur.value())); + + if (cur.first_child()) + cur = cur.first_child(); + else if (cur.next_sibling()) + cur = cur.next_sibling(); + else + { + while (!cur.next_sibling() && cur != n) + cur = cur.parent(); + + if (cur != n) cur = cur.next_sibling(); + } + } + + return result; + } + + default: + return xpath_string(); + } + } + } + + unsigned int node_height(xml_node n) + { + unsigned int result = 0; + + while (n) + { + ++result; + n = n.parent(); + } + + return result; + } + + // precondition: node_height of ln is <= node_height of rn, ln != rn + bool node_is_before(xml_node ln, unsigned int lh, xml_node rn, unsigned int rh) + { + assert(lh <= rh); + + while (lh < rh) + { + --rh; + rn = rn.parent(); + } + + if (ln == rn) return true; + + while (ln.parent() != rn.parent()) + { + ln = ln.parent(); + rn = rn.parent(); + } + + for (; ln; ln = ln.next_sibling()) + if (ln == rn) + return true; + + return false; + } + + bool node_is_ancestor(xml_node parent, xml_node node) + { + while (node && node != parent) node = node.parent(); + + return parent && node == parent; + } + + struct document_order_comparator + { + bool operator()(const xpath_node& lhs, const xpath_node& rhs) const + { + xml_node ln = lhs.node(), rn = rhs.node(); + + const void* lo = lhs.attribute() ? lhs.attribute().document_order() : ln.document_order(); + const void* ro = rhs.attribute() ? rhs.attribute().document_order() : rn.document_order(); + + if (lo && ro) return lo < ro; + + if (lhs.attribute() && rhs.attribute()) + { + if (lhs.parent() == rhs.parent()) + { + for (xml_attribute a = lhs.attribute(); a; a = a.next_attribute()) + if (a == rhs.attribute()) + return true; + + return false; + } + + ln = lhs.parent(); + rn = rhs.parent(); + } + else if (lhs.attribute()) + { + if (lhs.parent() == rhs.node()) return false; + + ln = lhs.parent(); + } + else if (rhs.attribute()) + { + if (rhs.parent() == lhs.node()) return true; + + rn = rhs.parent(); + } + + if (ln == rn) return false; + + unsigned int lh = node_height(ln); + unsigned int rh = node_height(rn); + + return (lh <= rh) ? node_is_before(ln, lh, rn, rh) : !node_is_before(rn, rh, ln, lh); + } + }; + + struct duplicate_comparator + { + bool operator()(const xpath_node& lhs, const xpath_node& rhs) const + { + if (lhs.attribute()) return rhs.attribute() ? lhs.attribute() < rhs.attribute() : true; + else return rhs.attribute() ? false : lhs.node() < rhs.node(); + } + }; + + double gen_nan() + { + #if defined(__STDC_IEC_559__) || ((FLT_RADIX - 0 == 2) && (FLT_MAX_EXP - 0 == 128) && (FLT_MANT_DIG - 0 == 24)) + union { float f; int32_t i; } u[sizeof(float) == sizeof(int32_t) ? 1 : -1]; + u[0].i = 0x7fc00000; + return u[0].f; + #else + // fallback + const volatile double zero = 0.0; + return zero / zero; + #endif + } + + bool is_nan(double value) + { + #if defined(_MSC_VER) || defined(__BORLANDC__) + return !!_isnan(value); + #elif defined(fpclassify) && defined(FP_NAN) + return fpclassify(value) == FP_NAN; + #else + // fallback + const volatile double v = value; + return v != v; + #endif + } + + const char_t* convert_number_to_string_special(double value) + { + #if defined(_MSC_VER) || defined(__BORLANDC__) + if (_finite(value)) return (value == 0) ? PUGIXML_TEXT("0") : 0; + if (_isnan(value)) return PUGIXML_TEXT("NaN"); + return PUGIXML_TEXT("-Infinity") + (value > 0); + #elif defined(fpclassify) && defined(FP_NAN) && defined(FP_INFINITE) && defined(FP_ZERO) + switch (fpclassify(value)) + { + case FP_NAN: + return PUGIXML_TEXT("NaN"); + + case FP_INFINITE: + return PUGIXML_TEXT("-Infinity") + (value > 0); + + case FP_ZERO: + return PUGIXML_TEXT("0"); + + default: + return 0; + } + #else + // fallback + const volatile double v = value; + + if (v == 0) return PUGIXML_TEXT("0"); + if (v != v) return PUGIXML_TEXT("NaN"); + if (v * 2 == v) return PUGIXML_TEXT("-Infinity") + (value > 0); + return 0; + #endif + } + + bool convert_number_to_boolean(double value) + { + return (value != 0 && !is_nan(value)); + } + + void truncate_zeros(char* begin, char* end) + { + while (begin != end && end[-1] == '0') end--; + + *end = 0; + } + + // gets mantissa digits in the form of 0.xxxxx with 0. implied and the exponent +#if defined(_MSC_VER) && _MSC_VER >= 1400 + void convert_number_to_mantissa_exponent(double value, char* buffer, size_t buffer_size, char** out_mantissa, int* out_exponent) + { + // get base values + int sign, exponent; + _ecvt_s(buffer, buffer_size, value, DBL_DIG + 1, &exponent, &sign); + + // truncate redundant zeros + truncate_zeros(buffer, buffer + strlen(buffer)); + + // fill results + *out_mantissa = buffer; + *out_exponent = exponent; + } +#else + void convert_number_to_mantissa_exponent(double value, char* buffer, size_t buffer_size, char** out_mantissa, int* out_exponent) + { + // get a scientific notation value with IEEE DBL_DIG decimals + sprintf(buffer, "%.*e", DBL_DIG, value); + assert(strlen(buffer) < buffer_size); + (void)!buffer_size; + + // get the exponent (possibly negative) + char* exponent_string = strchr(buffer, 'e'); + assert(exponent_string); + + int exponent = atoi(exponent_string + 1); + + // extract mantissa string: skip sign + char* mantissa = buffer[0] == '-' ? buffer + 1 : buffer; + assert(mantissa[0] != '0' && mantissa[1] == '.'); + + // divide mantissa by 10 to eliminate integer part + mantissa[1] = mantissa[0]; + mantissa++; + exponent++; + + // remove extra mantissa digits and zero-terminate mantissa + truncate_zeros(mantissa, exponent_string); + + // fill results + *out_mantissa = mantissa; + *out_exponent = exponent; + } +#endif + + xpath_string convert_number_to_string(double value) + { + // try special number conversion + const char_t* special = convert_number_to_string_special(value); + if (special) return xpath_string_const(special); + + // get mantissa + exponent form + char mantissa_buffer[64]; + + char* mantissa; + int exponent; + convert_number_to_mantissa_exponent(value, mantissa_buffer, sizeof(mantissa_buffer), &mantissa, &exponent); + + // make the number! + char_t result[512]; + char_t* s = result; + + // sign + if (value < 0) *s++ = '-'; + + // integer part + if (exponent <= 0) + { + *s++ = '0'; + } + else + { + while (exponent > 0) + { + assert(*mantissa == 0 || (unsigned)(*mantissa - '0') <= 9); + *s++ = *mantissa ? *mantissa++ : '0'; + exponent--; + } + } + + // fractional part + if (*mantissa) + { + // decimal point + *s++ = '.'; + + // extra zeroes from negative exponent + while (exponent < 0) + { + *s++ = '0'; + exponent++; + } + + // extra mantissa digits + while (*mantissa) + { + assert((unsigned)(*mantissa - '0') <= 9); + *s++ = *mantissa++; + } + } + + // zero-terminate + assert(s < result + sizeof(result) / sizeof(result[0])); + *s = 0; + + return xpath_string(result); + } + + bool check_string_to_number_format(const char_t* string) + { + // parse leading whitespace + while (IS_CHARTYPEX(*string, ctx_space)) ++string; + + // parse sign + if (*string == '-') ++string; + + if (!*string) return false; + + // if there is no integer part, there should be a decimal part with at least one digit + if (!IS_CHARTYPEX(string[0], ctx_digit) && (string[0] != '.' || !IS_CHARTYPEX(string[1], ctx_digit))) return false; + + // parse integer part + while (IS_CHARTYPEX(*string, ctx_digit)) ++string; + + // parse decimal part + if (*string == '.') + { + ++string; + + while (IS_CHARTYPEX(*string, ctx_digit)) ++string; + } + + // parse trailing whitespace + while (IS_CHARTYPEX(*string, ctx_space)) ++string; + + return *string == 0; + } + + double convert_string_to_number(const char_t* string) + { + // check string format + if (!check_string_to_number_format(string)) return gen_nan(); + + // parse string + #ifdef PUGIXML_WCHAR_MODE + return wcstod(string, 0); + #else + return atof(string); + #endif + } + + bool convert_string_to_number(const char_t* begin, const char_t* end, double* out_result) + { + char_t buffer[32]; + + size_t length = static_cast<size_t>(end - begin); + char_t* scratch = buffer; + + if (length >= sizeof(buffer) / sizeof(buffer[0])) + { + // need to make dummy on-heap copy + scratch = static_cast<char_t*>(get_memory_allocation_function()((length + 1) * sizeof(char_t))); + if (!scratch) return false; + } + + // copy string to zero-terminated buffer and perform conversion + memcpy(scratch, begin, length * sizeof(char_t)); + scratch[length] = 0; + + *out_result = convert_string_to_number(scratch); + + // free dummy buffer + if (scratch != buffer) get_memory_deallocation_function()(scratch); + + return true; + } + + double round_nearest(double value) + { + return floor(value + 0.5); + } + + double round_nearest_nzero(double value) + { + // same as round_nearest, but returns -0 for [-0.5, -0] + // ceil is used to differentiate between +0 and -0 (we return -0 for [-0.5, -0] and +0 for +0) + return (value >= -0.5 && value <= 0) ? ceil(value) : floor(value + 0.5); + } + + const char_t* qualified_name(const xpath_node& node) + { + return node.attribute() ? node.attribute().name() : node.node().name(); + } + + const char_t* local_name(const xpath_node& node) + { + const char_t* name = qualified_name(node); + const char_t* p = find_char(name, ':'); + + return p ? p + 1 : name; + } + + struct namespace_uri_predicate + { + const char_t* prefix; + size_t prefix_length; + + namespace_uri_predicate(const char_t* name) + { + const char_t* pos = find_char(name, ':'); + + prefix = pos ? name : 0; + prefix_length = pos ? static_cast<size_t>(pos - name) : 0; + } + + bool operator()(const xml_attribute& a) const + { + const char_t* name = a.name(); + + if (!starts_with(name, PUGIXML_TEXT("xmlns"))) return false; + + return prefix ? name[5] == ':' && impl::strequalrange(name + 6, prefix, prefix_length) : name[5] == 0; + } + }; + + const char_t* namespace_uri(const xml_node& node) + { + namespace_uri_predicate pred = node.name(); + + xml_node p = node; + + while (p) + { + xml_attribute a = p.find_attribute(pred); + + if (a) return a.value(); + + p = p.parent(); + } + + return PUGIXML_TEXT(""); + } + + const char_t* namespace_uri(const xml_attribute& attr, const xml_node& parent) + { + namespace_uri_predicate pred = attr.name(); + + // Default namespace does not apply to attributes + if (!pred.prefix) return PUGIXML_TEXT(""); + + xml_node p = parent; + + while (p) + { + xml_attribute a = p.find_attribute(pred); + + if (a) return a.value(); + + p = p.parent(); + } + + return PUGIXML_TEXT(""); + } + + const char_t* namespace_uri(const xpath_node& node) + { + return node.attribute() ? namespace_uri(node.attribute(), node.parent()) : namespace_uri(node.node()); + } + + void normalize_space(char_t* buffer) + { + char_t* write = buffer; + + for (char_t* it = buffer; *it; ) + { + char_t ch = *it++; + + if (IS_CHARTYPEX(ch, ctx_space)) + { + // replace whitespace sequence with single space + while (IS_CHARTYPEX(*it, ctx_space)) it++; + + // avoid leading spaces + if (write != buffer) *write++ = ' '; + } + else *write++ = ch; + } + + // remove trailing space + if (write != buffer && IS_CHARTYPEX(write[-1], ctx_space)) write--; + + // zero-terminate + *write = 0; + } + + void translate(char_t* buffer, const char_t* from, const char_t* to) + { + size_t to_length = impl::strlen(to); + + char_t* write = buffer; + + while (*buffer) + { + #ifdef __DMC__ + volatile // explicitly store to local to work around DMC bug (it loads 4 bytes from buffer otherwise) + #endif + char_t ch = *buffer++; + + const char_t* pos = find_char(from, ch); + + if (!pos) + *write++ = ch; // do not process + else if (static_cast<size_t>(pos - from) < to_length) + *write++ = to[pos - from]; // replace + } + + // zero-terminate + *write = 0; + } +} + +namespace pugi +{ +#ifndef PUGIXML_NO_EXCEPTIONS + xpath_exception::xpath_exception(const xpath_parse_result& result): _result(result) + { + assert(result.error); + } + + const char* xpath_exception::what() const throw() + { + return _result.error; + } + + const xpath_parse_result& xpath_exception::result() const + { + return _result; + } +#endif + + const size_t xpath_memory_block_size = 4096; + + class xpath_allocator + { + struct memory_block + { + memory_block* next; + + char data[xpath_memory_block_size]; + }; + + memory_block* _root; + size_t _root_size; + + memory_block _first; + + public: + static xpath_allocator* create() + { + void* memory = get_memory_allocation_function()(sizeof(xpath_allocator)); + + return new (memory) xpath_allocator(); + } + + static void destroy(xpath_allocator* alloc) + { + if (!alloc) return; + + // free all allocated pages + memory_block* cur = alloc->_root; + memory_block* first = &alloc->_first; + + while (cur != first) + { + memory_block* next = cur->next; + + get_memory_deallocation_function()(cur); + + cur = next; + } + + // free allocator memory (with the first page) + get_memory_deallocation_function()(alloc); + } + + xpath_allocator() + { + _root = &_first; + _root_size = 0; + _first.next = 0; + } + + void* allocate(size_t size) + { + // align size so that we're able to store pointers in subsequent blocks + size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1); + + if (_root_size + size <= xpath_memory_block_size) + { + void* buf = _root->data + _root_size; + _root_size += size; + return buf; + } + else + { + size_t block_data_size = (size > xpath_memory_block_size) ? size : xpath_memory_block_size; + size_t block_size = block_data_size + offsetof(memory_block, data); + + memory_block* block = static_cast<memory_block*>(get_memory_allocation_function()(block_size)); + if (!block) return 0; + + block->next = _root; + + _root = block; + _root_size = size; + + return block->data; + } + } + }; + + xpath_node::xpath_node() + { + } + + xpath_node::xpath_node(const xml_node& node): _node(node) + { + } + + xpath_node::xpath_node(const xml_attribute& attribute, const xml_node& parent): _node(parent), _attribute(attribute) + { + } + + xml_node xpath_node::node() const + { + return _attribute ? xml_node() : _node; + } + + xml_attribute xpath_node::attribute() const + { + return _attribute; + } + + xml_node xpath_node::parent() const + { + return _attribute ? _node : _node.parent(); + } + + xpath_node::operator xpath_node::unspecified_bool_type() const + { + return (_node || _attribute) ? &xpath_node::_node : 0; + } + + bool xpath_node::operator!() const + { + return !(_node || _attribute); + } + + bool xpath_node::operator==(const xpath_node& n) const + { + return _node == n._node && _attribute == n._attribute; + } + + bool xpath_node::operator!=(const xpath_node& n) const + { + return _node != n._node || _attribute != n._attribute; + } + +#ifdef __BORLANDC__ + bool operator&&(const xpath_node& lhs, bool rhs) + { + return (bool)lhs && rhs; + } + + bool operator||(const xpath_node& lhs, bool rhs) + { + return (bool)lhs || rhs; + } +#endif + + xpath_node_set::xpath_node_set(): _type(type_unsorted), _begin(&_storage), _end(&_storage), _eos(&_storage + 1) + { + } + + xpath_node_set::~xpath_node_set() + { + if (_begin != &_storage) get_memory_deallocation_function()(_begin); + } + + xpath_node_set::xpath_node_set(const xpath_node_set& ns): _type(ns._type), _begin(&_storage), _end(&_storage), _eos(&_storage + 1) + { + if (ns.size() == 1) + { + _storage = *ns._begin; + _end = _eos; + } + else + { + append(ns.begin(), ns.end()); + } + } + + xpath_node_set& xpath_node_set::operator=(const xpath_node_set& ns) + { + if (this == &ns) return *this; + + // clear & append + _type = ns._type; + _end = _begin; + + append(ns.begin(), ns.end()); + + return *this; + } + + void xpath_node_set::swap(xpath_node_set& ns) + { + pstd::swap(_type, ns._type); + pstd::swap(_storage, ns._storage); + pstd::swap(_begin, ns._begin); + pstd::swap(_end, ns._end); + pstd::swap(_eos, ns._eos); + } + + xpath_node_set::type_t xpath_node_set::type() const + { + return _type; + } + + size_t xpath_node_set::size() const + { + return _end - _begin; + } + + bool xpath_node_set::empty() const + { + return size() == 0; + } + + const xpath_node& xpath_node_set::operator[](size_t index) const + { + assert(index < size()); + return _begin[index]; + } + + xpath_node_set::iterator xpath_node_set::mut_begin() + { + return _begin; + } + + xpath_node_set::const_iterator xpath_node_set::begin() const + { + return _begin; + } + + xpath_node_set::const_iterator xpath_node_set::end() const + { + return _end; + } + + void xpath_node_set::sort(bool reverse) + { + pstd::sort(_begin, _end, document_order_comparator()); + + if (reverse) pstd::reverse(_begin, _end); + + _type = reverse ? type_sorted_reverse : type_sorted; + } + + void xpath_node_set::push_back(const xpath_node& n) + { + if (_end == _eos) + append(&n, &n + 1); + else + { + *_end = n; + ++_end; + } + } + + void xpath_node_set::append(const_iterator begin, const_iterator end) + { + if (begin == end) return; + + size_t count = end - begin; + size_t size = _end - _begin; + size_t capacity = _eos - _begin; + + if (capacity < size + count) + { + if (capacity < 2) capacity = 2; + + while (capacity < size + count) capacity += capacity / 2; + + xpath_node* storage = static_cast<xpath_node*>(get_memory_allocation_function()(capacity * sizeof(xpath_node))); + if (!storage) return; // $$ out of memory + + pstd::copy(_begin, _end, storage); + // memcpy(storage, _begin, size * sizeof(xpath_node)); + + if (_begin != &_storage) get_memory_deallocation_function()(_begin); + + _begin = storage; + _end = storage + size; + _eos = storage + capacity; + } + + pstd::copy(begin, end, _end); + // memcpy(_end, begin, count * sizeof(xpath_node)); + _end += count; + } + + void xpath_node_set::truncate(iterator it) + { + _end = it; + } + + xpath_node xpath_node_set::first() const + { + if (empty()) return xpath_node(); + + switch (_type) + { + case type_sorted: return *_begin; + case type_sorted_reverse: return *(_end - 1); + case type_unsorted: return *pstd::min_element(_begin, _end, document_order_comparator()); + default: return xpath_node(); + } + } + + void xpath_node_set::remove_duplicates() + { + if (_type == type_unsorted) + { + pstd::sort(_begin, _end, duplicate_comparator()); + } + + truncate(pstd::unique(_begin, _end)); + } + + struct xpath_context + { + xpath_node n; + size_t position, size; + + xpath_context(const xpath_node& n, size_t position, size_t size): n(n), position(position), size(size) + { + } + }; + + enum lexeme_t + { + lex_none = 0, + lex_equal, + lex_not_equal, + lex_less, + lex_greater, + lex_less_or_equal, + lex_greater_or_equal, + lex_plus, + lex_minus, + lex_multiply, + lex_union, + lex_var_ref, + lex_open_brace, + lex_close_brace, + lex_quoted_string, + lex_number, + lex_slash, + lex_double_slash, + lex_open_square_brace, + lex_close_square_brace, + lex_string, + lex_comma, + lex_axis_attribute, + lex_dot, + lex_double_dot, + lex_double_colon, + lex_eof + }; + + struct xpath_lexer_string + { + const char_t* begin; + const char_t* end; + + xpath_lexer_string(): begin(0), end(0) + { + } + + bool operator==(const char_t* other) const + { + size_t length = static_cast<size_t>(end - begin); + + return impl::strequalrange(other, begin, length); + } + }; + + class xpath_lexer + { + const char_t* _cur; + const char_t* _cur_lexeme_pos; + xpath_lexer_string _cur_lexeme_contents; + + lexeme_t _cur_lexeme; + + public: + explicit xpath_lexer(const char_t* query): _cur(query) + { + next(); + } + + const char_t* state() const + { + return _cur; + } + + void next() + { + const char_t* cur = _cur; + + while (IS_CHARTYPEX(*cur, ctx_space)) ++cur; + + // save lexeme position for error reporting + _cur_lexeme_pos = cur; + + switch (*cur) + { + case 0: + _cur_lexeme = lex_eof; + break; + + case '>': + if (*(cur+1) == '=') + { + cur += 2; + _cur_lexeme = lex_greater_or_equal; + } + else + { + cur += 1; + _cur_lexeme = lex_greater; + } + break; + + case '<': + if (*(cur+1) == '=') + { + cur += 2; + _cur_lexeme = lex_less_or_equal; + } + else + { + cur += 1; + _cur_lexeme = lex_less; + } + break; + + case '!': + if (*(cur+1) == '=') + { + cur += 2; + _cur_lexeme = lex_not_equal; + } + else + { + _cur_lexeme = lex_none; + } + break; + + case '=': + cur += 1; + _cur_lexeme = lex_equal; + + break; + + case '+': + cur += 1; + _cur_lexeme = lex_plus; + + break; + + case '-': + cur += 1; + _cur_lexeme = lex_minus; + + break; + + case '*': + cur += 1; + _cur_lexeme = lex_multiply; + + break; + + case '|': + cur += 1; + _cur_lexeme = lex_union; + + break; + + case '$': + cur += 1; + _cur_lexeme = lex_var_ref; + + break; + + case '(': + cur += 1; + _cur_lexeme = lex_open_brace; + + break; + + case ')': + cur += 1; + _cur_lexeme = lex_close_brace; + + break; + + case '[': + cur += 1; + _cur_lexeme = lex_open_square_brace; + + break; + + case ']': + cur += 1; + _cur_lexeme = lex_close_square_brace; + + break; + + case ',': + cur += 1; + _cur_lexeme = lex_comma; + + break; + + case '/': + if (*(cur+1) == '/') + { + cur += 2; + _cur_lexeme = lex_double_slash; + } + else + { + cur += 1; + _cur_lexeme = lex_slash; + } + break; + + case '.': + if (*(cur+1) == '.') + { + cur += 2; + _cur_lexeme = lex_double_dot; + } + else if (IS_CHARTYPEX(*(cur+1), ctx_digit)) + { + _cur_lexeme_contents.begin = cur; // . + + ++cur; + + while (IS_CHARTYPEX(*cur, ctx_digit)) cur++; + + _cur_lexeme_contents.end = cur; + + _cur_lexeme = lex_number; + } + else + { + cur += 1; + _cur_lexeme = lex_dot; + } + break; + + case '@': + cur += 1; + _cur_lexeme = lex_axis_attribute; + + break; + + case '"': + case '\'': + { + char_t terminator = *cur; + + ++cur; + + _cur_lexeme_contents.begin = cur; + while (*cur && *cur != terminator) cur++; + _cur_lexeme_contents.end = cur; + + if (!*cur) + _cur_lexeme = lex_none; + else + { + cur += 1; + _cur_lexeme = lex_quoted_string; + } + + break; + } + + case ':': + if (*(cur+1) == ':') + { + cur += 2; + _cur_lexeme = lex_double_colon; + } + else + { + _cur_lexeme = lex_none; + } + break; + + default: + if (IS_CHARTYPEX(*cur, ctx_digit)) + { + _cur_lexeme_contents.begin = cur; + + while (IS_CHARTYPEX(*cur, ctx_digit)) cur++; + + if (*cur == '.') + { + cur++; + + while (IS_CHARTYPEX(*cur, ctx_digit)) cur++; + } + + _cur_lexeme_contents.end = cur; + + _cur_lexeme = lex_number; + } + else if (IS_CHARTYPEX(*cur, ctx_start_symbol)) + { + _cur_lexeme_contents.begin = cur; + + while (IS_CHARTYPEX(*cur, ctx_symbol)) cur++; + + if (cur[0] == ':') + { + if (cur[1] == '*') // namespace test ncname:* + { + cur += 2; // :* + } + else if (IS_CHARTYPEX(cur[1], ctx_symbol)) // namespace test qname + { + cur++; // : + + while (IS_CHARTYPEX(*cur, ctx_symbol)) cur++; + } + } + + _cur_lexeme_contents.end = cur; + + _cur_lexeme = lex_string; + } + else + { + _cur_lexeme = lex_none; + } + } + + _cur = cur; + } + + lexeme_t current() const + { + return _cur_lexeme; + } + + const char_t* current_pos() const + { + return _cur_lexeme_pos; + } + + const xpath_lexer_string& contents() const + { + assert(_cur_lexeme == lex_number || _cur_lexeme == lex_string || _cur_lexeme == lex_quoted_string); + + return _cur_lexeme_contents; + } + }; + + enum ast_type_t + { + ast_op_or, // left or right + ast_op_and, // left and right + ast_op_equal, // left = right + ast_op_not_equal, // left != right + ast_op_less, // left < right + ast_op_greater, // left > right + ast_op_less_or_equal, // left <= right + ast_op_greater_or_equal, // left >= right + ast_op_add, // left + right + ast_op_subtract, // left - right + ast_op_multiply, // left * right + ast_op_divide, // left / right + ast_op_mod, // left % right + ast_op_negate, // left - right + ast_op_union, // left | right + ast_predicate, // apply predicate to set; next points to next predicate + ast_filter, // select * from left where right + ast_filter_posinv, // select * from left where right; proximity position invariant + ast_string_constant, // string constant + ast_number_constant, // number constant + ast_func_last, // last() + ast_func_position, // position() + ast_func_count, // count(left) + ast_func_id, // id(left) + ast_func_local_name_0, // local-name() + ast_func_local_name_1, // local-name(left) + ast_func_namespace_uri_0, // namespace-uri() + ast_func_namespace_uri_1, // namespace-uri(left) + ast_func_name_0, // name() + ast_func_name_1, // name(left) + ast_func_string_0, // string() + ast_func_string_1, // string(left) + ast_func_concat, // concat(left, right, siblings) + ast_func_starts_with, // starts_with(left, right) + ast_func_contains, // contains(left, right) + ast_func_substring_before, // substring-before(left, right) + ast_func_substring_after, // substring-after(left, right) + ast_func_substring_2, // substring(left, right) + ast_func_substring_3, // substring(left, right, third) + ast_func_string_length_0, // string-length() + ast_func_string_length_1, // string-length(left) + ast_func_normalize_space_0, // normalize-space() + ast_func_normalize_space_1, // normalize-space(left) + ast_func_translate, // translate(left, right, third) + ast_func_boolean, // boolean(left) + ast_func_not, // not(left) + ast_func_true, // true() + ast_func_false, // false() + ast_func_lang, // lang(left) + ast_func_number_0, // number() + ast_func_number_1, // number(left) + ast_func_sum, // sum(left) + ast_func_floor, // floor(left) + ast_func_ceiling, // ceiling(left) + ast_func_round, // round(left) + ast_step, // process set left with step + ast_step_root // select root node + }; + + enum axis_t + { + axis_ancestor, + axis_ancestor_or_self, + axis_attribute, + axis_child, + axis_descendant, + axis_descendant_or_self, + axis_following, + axis_following_sibling, + axis_namespace, + axis_parent, + axis_preceding, + axis_preceding_sibling, + axis_self + }; + + enum nodetest_t + { + nodetest_none, + nodetest_name, + nodetest_type_node, + nodetest_type_comment, + nodetest_type_pi, + nodetest_type_text, + nodetest_pi, + nodetest_all, + nodetest_all_in_namespace + }; + + template <axis_t N> struct axis_to_type + { + static const axis_t axis; + }; + + template <axis_t N> const axis_t axis_to_type<N>::axis = N; + + class xpath_ast_node + { + private: + // node type + char _type; + char _rettype; + + // for ast_step / ast_predicate + char _axis; + char _test; + + // tree node structure + xpath_ast_node* _left; + xpath_ast_node* _right; + xpath_ast_node* _next; + + union + { + // value for ast_string_constant + const char_t* string; + // value for ast_number_constant + double number; + // node test for ast_step (node name/namespace/node type/pi target) + const char_t* nodetest; + } _data; + + xpath_ast_node(const xpath_ast_node&); + xpath_ast_node& operator=(const xpath_ast_node&); + + template <class Comp> static bool compare_eq(xpath_ast_node* lhs, xpath_ast_node* rhs, const xpath_context& c, const Comp& comp) + { + xpath_value_type lt = lhs->rettype(), rt = rhs->rettype(); + + if (lt != xpath_type_node_set && rt != xpath_type_node_set) + { + if (lt == xpath_type_boolean || rt == xpath_type_boolean) + return comp(lhs->eval_boolean(c), rhs->eval_boolean(c)); + else if (lt == xpath_type_number || rt == xpath_type_number) + return comp(lhs->eval_number(c), rhs->eval_number(c)); + else if (lt == xpath_type_string || rt == xpath_type_string) + return comp(lhs->eval_string(c), rhs->eval_string(c)); + } + else if (lt == xpath_type_node_set && rt == xpath_type_node_set) + { + xpath_node_set ls = lhs->eval_node_set(c); + xpath_node_set rs = rhs->eval_node_set(c); + + for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li) + for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri) + { + if (comp(string_value(*li), string_value(*ri))) + return true; + } + + return false; + } + else + { + if (lt == xpath_type_node_set) + { + pstd::swap(lhs, rhs); + pstd::swap(lt, rt); + } + + if (lt == xpath_type_boolean) + return comp(lhs->eval_boolean(c), rhs->eval_boolean(c)); + else if (lt == xpath_type_number) + { + double l = lhs->eval_number(c); + xpath_node_set rs = rhs->eval_node_set(c); + + for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri) + { + if (comp(l, convert_string_to_number(string_value(*ri).c_str()))) + return true; + } + + return false; + } + else if (lt == xpath_type_string) + { + xpath_string l = lhs->eval_string(c); + xpath_node_set rs = rhs->eval_node_set(c); + + for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri) + { + if (comp(l, string_value(*ri))) + return true; + } + + return false; + } + } + + assert(!"Wrong types"); + return false; + } + + template <class Comp> static bool compare_rel(xpath_ast_node* lhs, xpath_ast_node* rhs, const xpath_context& c, const Comp& comp) + { + xpath_value_type lt = lhs->rettype(), rt = rhs->rettype(); + + if (lt != xpath_type_node_set && rt != xpath_type_node_set) + return comp(lhs->eval_number(c), rhs->eval_number(c)); + else if (lt == xpath_type_node_set && rt == xpath_type_node_set) + { + xpath_node_set ls = lhs->eval_node_set(c); + xpath_node_set rs = rhs->eval_node_set(c); + + for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li) + { + double l = convert_string_to_number(string_value(*li).c_str()); + + for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri) + { + if (comp(l, convert_string_to_number(string_value(*ri).c_str()))) + return true; + } + } + + return false; + } + else if (lt != xpath_type_node_set && rt == xpath_type_node_set) + { + double l = lhs->eval_number(c); + xpath_node_set rs = rhs->eval_node_set(c); + + for (xpath_node_set::const_iterator ri = rs.begin(); ri != rs.end(); ++ri) + { + if (comp(l, convert_string_to_number(string_value(*ri).c_str()))) + return true; + } + + return false; + } + else if (lt == xpath_type_node_set && rt != xpath_type_node_set) + { + xpath_node_set ls = lhs->eval_node_set(c); + double r = rhs->eval_number(c); + + for (xpath_node_set::const_iterator li = ls.begin(); li != ls.end(); ++li) + { + if (comp(convert_string_to_number(string_value(*li).c_str()), r)) + return true; + } + + return false; + } + else + { + assert(!"Wrong types"); + return false; + } + } + + void apply_predicate(xpath_node_set& ns, size_t first, xpath_ast_node* expr) + { + assert(ns.size() >= first); + + size_t i = 1; + size_t size = ns.size() - first; + + xpath_node_set::iterator last = ns.mut_begin() + first; + + // remove_if... or well, sort of + for (xpath_node_set::iterator it = last; it != ns.end(); ++it, ++i) + { + xpath_context c(*it, i, size); + + if (expr->rettype() == xpath_type_number) + { + if (expr->eval_number(c) == i) + *last++ = *it; + } + else if (expr->eval_boolean(c)) + *last++ = *it; + } + + ns.truncate(last); + } + + void apply_predicates(xpath_node_set& ns, size_t first) + { + if (ns.size() == first) return; + + for (xpath_ast_node* pred = _right; pred; pred = pred->_next) + { + apply_predicate(ns, first, pred->_left); + } + } + + void step_push(xpath_node_set& ns, const xml_attribute& a, const xml_node& parent) + { + if (!a) return; + + const char_t* name = a.name(); + + // There are no attribute nodes corresponding to attributes that declare namespaces + // That is, "xmlns:..." or "xmlns" + if (starts_with(name, PUGIXML_TEXT("xmlns")) && (name[5] == 0 || name[5] == ':')) return; + + switch (_test) + { + case nodetest_name: + if (impl::strequal(name, _data.nodetest)) ns.push_back(xpath_node(a, parent)); + break; + + case nodetest_type_node: + case nodetest_all: + ns.push_back(xpath_node(a, parent)); + break; + + case nodetest_all_in_namespace: + if (starts_with(name, _data.nodetest)) + ns.push_back(xpath_node(a, parent)); + break; + + default: + ; + } + } + + void step_push(xpath_node_set& ns, const xml_node& n) + { + if (!n) return; + + switch (_test) + { + case nodetest_name: + if (n.type() == node_element && impl::strequal(n.name(), _data.nodetest)) ns.push_back(n); + break; + + case nodetest_type_node: + ns.push_back(n); + break; + + case nodetest_type_comment: + if (n.type() == node_comment) + ns.push_back(n); + break; + + case nodetest_type_text: + if (n.type() == node_pcdata || n.type() == node_cdata) + ns.push_back(n); + break; + + case nodetest_type_pi: + if (n.type() == node_pi) + ns.push_back(n); + break; + + case nodetest_pi: + if (n.type() == node_pi && impl::strequal(n.name(), _data.nodetest)) + ns.push_back(n); + break; + + case nodetest_all: + if (n.type() == node_element) + ns.push_back(n); + break; + + case nodetest_all_in_namespace: + if (n.type() == node_element && starts_with(n.name(), _data.nodetest)) + ns.push_back(n); + break; + + default: + assert(!"Unknown axis"); + } + } + + template <class T> void step_fill(xpath_node_set& ns, const xml_node& n, T) + { + const axis_t axis = T::axis; + + switch (axis) + { + case axis_attribute: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + for (xml_attribute a = n.first_attribute(); a; a = a.next_attribute()) + step_push(ns, a, n); + + break; + } + + case axis_child: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + for (xml_node c = n.first_child(); c; c = c.next_sibling()) + step_push(ns, c); + + break; + } + + case axis_descendant: + case axis_descendant_or_self: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + if (axis == axis_descendant_or_self) + step_push(ns, n); + + xml_node cur = n.first_child(); + + while (cur && cur != n) + { + step_push(ns, cur); + + if (cur.first_child()) + cur = cur.first_child(); + else if (cur.next_sibling()) + cur = cur.next_sibling(); + else + { + while (!cur.next_sibling() && cur != n) + cur = cur.parent(); + + if (cur != n) cur = cur.next_sibling(); + } + } + + break; + } + + case axis_following_sibling: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + for (xml_node c = n.next_sibling(); c; c = c.next_sibling()) + step_push(ns, c); + + break; + } + + case axis_preceding_sibling: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted; + + for (xml_node c = n.previous_sibling(); c; c = c.previous_sibling()) + step_push(ns, c); + + break; + } + + case axis_following: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + xml_node cur = n; + + // exit from this node so that we don't include descendants + while (cur && !cur.next_sibling()) cur = cur.parent(); + cur = cur.next_sibling(); + + for (;;) + { + step_push(ns, cur); + + if (cur.first_child()) + cur = cur.first_child(); + else if (cur.next_sibling()) + cur = cur.next_sibling(); + else + { + while (cur && !cur.next_sibling()) cur = cur.parent(); + cur = cur.next_sibling(); + + if (!cur) break; + } + } + + break; + } + + case axis_preceding: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted; + + xml_node cur = n; + + while (cur && !cur.previous_sibling()) cur = cur.parent(); + cur = cur.previous_sibling(); + + for (;;) + { + if (cur.last_child()) + cur = cur.last_child(); + else + { + // leaf node, can't be ancestor + step_push(ns, cur); + + if (cur.previous_sibling()) + cur = cur.previous_sibling(); + else + { + do + { + cur = cur.parent(); + if (!cur) break; + + if (!node_is_ancestor(cur, n)) step_push(ns, cur); + } + while (!cur.previous_sibling()); + + cur = cur.previous_sibling(); + + if (!cur) break; + } + } + } + + break; + } + + case axis_ancestor: + case axis_ancestor_or_self: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted; + + if (axis == axis_ancestor_or_self) + step_push(ns, n); + + xml_node cur = n.parent(); + + while (cur) + { + step_push(ns, cur); + + cur = cur.parent(); + } + + break; + } + + case axis_self: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + step_push(ns, n); + + break; + } + + case axis_parent: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + if (n.parent()) step_push(ns, n.parent()); + + break; + } + + default: + assert(!"Unimplemented axis"); + } + } + + template <class T> void step_fill(xpath_node_set& ns, const xml_attribute& a, const xml_node& p, T v) + { + const axis_t axis = T::axis; + + switch (axis) + { + case axis_ancestor: + case axis_ancestor_or_self: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted_reverse : xpath_node_set::type_unsorted; + + if (axis == axis_ancestor_or_self && _test == nodetest_type_node) // reject attributes based on principal node type test + step_push(ns, a, p); + + xml_node cur = p; + + while (cur) + { + step_push(ns, cur); + + cur = cur.parent(); + } + + break; + } + + case axis_descendant_or_self: + case axis_self: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + if (_test == nodetest_type_node) // reject attributes based on principal node type test + step_push(ns, a, p); + + break; + } + + case axis_following: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + xml_node cur = p; + + for (;;) + { + if (cur.first_child()) + cur = cur.first_child(); + else if (cur.next_sibling()) + cur = cur.next_sibling(); + else + { + while (cur && !cur.next_sibling()) cur = cur.parent(); + cur = cur.next_sibling(); + + if (!cur) break; + } + + step_push(ns, cur); + } + + break; + } + + case axis_parent: + { + ns._type = ns.empty() ? xpath_node_set::type_sorted : xpath_node_set::type_unsorted; + + step_push(ns, p); + + break; + } + + case axis_preceding: + { + // preceding:: axis does not include attribute nodes and attribute ancestors (they are the same as parent's ancestors), so we can reuse node preceding + step_fill(ns, p, v); + break; + } + + default: + assert(!"Unimplemented axis"); + } + } + + template <class T> void step_do(xpath_node_set& ns, const xpath_context& c, T v) + { + const axis_t axis = T::axis; + + assert(ns.empty()); + + switch (axis) + { + case axis_ancestor: + case axis_ancestor_or_self: + case axis_descendant_or_self: + case axis_following: + case axis_parent: + case axis_preceding: + case axis_self: + if (_left) + { + xpath_node_set s = _left->eval_node_set(c); + + for (xpath_node_set::const_iterator it = s.begin(); it != s.end(); ++it) + { + size_t size = ns.size(); + + if (it->node()) + step_fill(ns, it->node(), v); + else + step_fill(ns, it->attribute(), it->parent(), v); + + apply_predicates(ns, size); + } + } + else + { + if (c.n.node()) step_fill(ns, c.n.node(), v); + else step_fill(ns, c.n.attribute(), c.n.parent(), v); + + apply_predicates(ns, 0); + } + + break; + + case axis_following_sibling: + case axis_preceding_sibling: + case axis_attribute: + case axis_child: + case axis_descendant: + if (_left) + { + xpath_node_set s = _left->eval_node_set(c); + + for (xpath_node_set::const_iterator it = s.begin(); it != s.end(); ++it) + { + size_t size = ns.size(); + + if (it->node()) + step_fill(ns, it->node(), v); + + apply_predicates(ns, size); + } + } + else if (c.n.node()) + { + step_fill(ns, c.n.node(), v); + + apply_predicates(ns, 0); + } + + break; + + case axis_namespace: + break; + + default: + assert(!"Unimplemented axis"); + } + } + + public: + xpath_ast_node(ast_type_t type, xpath_value_type rettype, const char_t* value): + _type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(0), _right(0), _next(0) + { + assert(type == ast_string_constant); + _data.string = value; + } + + xpath_ast_node(ast_type_t type, xpath_value_type rettype, double value): + _type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(0), _right(0), _next(0) + { + assert(type == ast_number_constant); + _data.number = value; + } + + xpath_ast_node(ast_type_t type, xpath_value_type rettype, xpath_ast_node* left = 0, xpath_ast_node* right = 0): + _type((char)type), _rettype((char)rettype), _axis(0), _test(0), _left(left), _right(right), _next(0) + { + } + + xpath_ast_node(ast_type_t type, xpath_ast_node* left, axis_t axis, nodetest_t test, const char_t* contents): + _type((char)type), _rettype(xpath_type_node_set), _axis((char)axis), _test((char)test), _left(left), _right(0), _next(0) + { + _data.nodetest = contents; + } + + void set_next(xpath_ast_node* value) + { + _next = value; + } + + void set_right(xpath_ast_node* value) + { + _right = value; + } + + bool eval_boolean(const xpath_context& c) + { + switch (_type) + { + case ast_op_or: + if (_left->eval_boolean(c)) return true; + else return _right->eval_boolean(c); + + case ast_op_and: + if (!_left->eval_boolean(c)) return false; + else return _right->eval_boolean(c); + + case ast_op_equal: + return compare_eq(_left, _right, c, pstd::equal_to()); + + case ast_op_not_equal: + return compare_eq(_left, _right, c, pstd::not_equal_to()); + + case ast_op_less: + return compare_rel(_left, _right, c, pstd::less()); + + case ast_op_greater: + return compare_rel(_right, _left, c, pstd::less()); + + case ast_op_less_or_equal: + return compare_rel(_left, _right, c, pstd::less_equal()); + + case ast_op_greater_or_equal: + return compare_rel(_right, _left, c, pstd::less_equal()); + + case ast_func_starts_with: + return starts_with(_left->eval_string(c).c_str(), _right->eval_string(c).c_str()); + + case ast_func_contains: + { + xpath_string lr = _left->eval_string(c); + xpath_string rr = _right->eval_string(c); + + return find_substring(lr.c_str(), rr.c_str()) != 0; + } + + case ast_func_boolean: + return _left->eval_boolean(c); + + case ast_func_not: + return !_left->eval_boolean(c); + + case ast_func_true: + return true; + + case ast_func_false: + return false; + + case ast_func_lang: + { + if (c.n.attribute()) return false; + + xpath_string lang = _left->eval_string(c); + + for (xml_node n = c.n.node(); n; n = n.parent()) + { + xml_attribute a = n.attribute(PUGIXML_TEXT("xml:lang")); + + if (a) + { + const char_t* value = a.value(); + + // strnicmp / strncasecmp is not portable + for (const char_t* lit = lang.c_str(); *lit; ++lit) + { + if (tolower(*lit) != tolower(*value)) return false; + ++value; + } + + return *value == 0 || *value == '-'; + } + } + + return false; + } + + default: + { + switch (_rettype) + { + case xpath_type_number: + return convert_number_to_boolean(eval_number(c)); + + case xpath_type_string: + return !eval_string(c).empty(); + + case xpath_type_node_set: + return !eval_node_set(c).empty(); + + default: + assert(!"Wrong expression for return type boolean"); + return false; + } + } + } + } + + double eval_number(const xpath_context& c) + { + switch (_type) + { + case ast_op_add: + return _left->eval_number(c) + _right->eval_number(c); + + case ast_op_subtract: + return _left->eval_number(c) - _right->eval_number(c); + + case ast_op_multiply: + return _left->eval_number(c) * _right->eval_number(c); + + case ast_op_divide: + return _left->eval_number(c) / _right->eval_number(c); + + case ast_op_mod: + return fmod(_left->eval_number(c), _right->eval_number(c)); + + case ast_op_negate: + return -_left->eval_number(c); + + case ast_number_constant: + return _data.number; + + case ast_func_last: + return (double)c.size; + + case ast_func_position: + return (double)c.position; + + case ast_func_count: + return (double)_left->eval_node_set(c).size(); + + case ast_func_string_length_0: + return (double)string_value(c.n).length(); + + case ast_func_string_length_1: + return (double)_left->eval_string(c).length(); + + case ast_func_number_0: + return convert_string_to_number(string_value(c.n).c_str()); + + case ast_func_number_1: + return _left->eval_number(c); + + case ast_func_sum: + { + double r = 0; + + xpath_node_set ns = _left->eval_node_set(c); + + for (xpath_node_set::const_iterator it = ns.begin(); it != ns.end(); ++it) + r += convert_string_to_number(string_value(*it).c_str()); + + return r; + } + + case ast_func_floor: + { + double r = _left->eval_number(c); + + return r == r ? floor(r) : r; + } + + case ast_func_ceiling: + { + double r = _left->eval_number(c); + + return r == r ? ceil(r) : r; + } + + case ast_func_round: + return round_nearest_nzero(_left->eval_number(c)); + + default: + { + switch (_rettype) + { + case xpath_type_boolean: + return eval_boolean(c) ? 1 : 0; + + case xpath_type_string: + return convert_string_to_number(eval_string(c).c_str()); + + case xpath_type_node_set: + return convert_string_to_number(eval_string(c).c_str()); + + default: + assert(!"Wrong expression for return type number"); + return 0; + } + + } + } + } + + xpath_string eval_string(const xpath_context& c) + { + switch (_type) + { + case ast_string_constant: + return xpath_string_const(_data.string); + + case ast_func_local_name_0: + { + xpath_node na = c.n; + + return xpath_string_const(local_name(na)); + } + + case ast_func_local_name_1: + { + xpath_node_set ns = _left->eval_node_set(c); + xpath_node na = ns.first(); + + return xpath_string_const(local_name(na)); + } + + case ast_func_name_0: + { + xpath_node na = c.n; + + return xpath_string_const(qualified_name(na)); + } + + case ast_func_name_1: + { + xpath_node_set ns = _left->eval_node_set(c); + xpath_node na = ns.first(); + + return xpath_string_const(qualified_name(na)); + } + + case ast_func_namespace_uri_0: + { + xpath_node na = c.n; + + return xpath_string_const(namespace_uri(na)); + } + + case ast_func_namespace_uri_1: + { + xpath_node_set ns = _left->eval_node_set(c); + xpath_node na = ns.first(); + + return xpath_string_const(namespace_uri(na)); + } + + case ast_func_string_0: + return string_value(c.n); + + case ast_func_string_1: + return _left->eval_string(c); + + case ast_func_concat: + { + xpath_string r = _left->eval_string(c); + + for (xpath_ast_node* n = _right; n; n = n->_next) + r.append(n->eval_string(c)); + + return r; + } + + case ast_func_substring_before: + { + xpath_string s = _left->eval_string(c); + xpath_string p = _right->eval_string(c); + + const char_t* pos = find_substring(s.c_str(), p.c_str()); + + return pos ? xpath_string(s.c_str(), pos) : xpath_string(); + } + + case ast_func_substring_after: + { + xpath_string s = _left->eval_string(c); + xpath_string p = _right->eval_string(c); + + const char_t* pos = find_substring(s.c_str(), p.c_str()); + + return pos ? xpath_string(pos + p.length()) : xpath_string(); + } + + case ast_func_substring_2: + { + xpath_string s = _left->eval_string(c); + double first = round_nearest(_right->eval_number(c)); + + if (is_nan(first)) return xpath_string(); // NaN + else if (first >= s.length() + 1) return xpath_string(); + + size_t pos = first < 1 ? 1 : (size_t)first; + + return xpath_string(s.c_str() + (pos - 1)); + } + + case ast_func_substring_3: + { + xpath_string s = _left->eval_string(c); + size_t s_length = s.length(); + + double first = round_nearest(_right->eval_number(c)); + double last = first + round_nearest(_right->_next->eval_number(c)); + + if (is_nan(first) || is_nan(last)) return xpath_string(); + else if (first >= s_length + 1) return xpath_string(); + else if (first >= last) return xpath_string(); + + size_t pos = first < 1 ? 1 : (size_t)first; + size_t end = last >= s_length + 1 ? s_length + 1 : (size_t)last; + + size_t size_requested = end - pos; + size_t size_to_end = s_length - pos + 1; + + size_t size = size_requested < size_to_end ? size_requested : size_to_end; + + return xpath_string(s.c_str() + pos - 1, s.c_str() + pos - 1 + size); + } + + case ast_func_normalize_space_0: + { + xpath_string s = string_value(c.n); + + normalize_space(s.data()); + + return s; + } + + case ast_func_normalize_space_1: + { + xpath_string s = _left->eval_string(c); + + normalize_space(s.data()); + + return s; + } + + case ast_func_translate: + { + xpath_string s = _left->eval_string(c); + xpath_string from = _right->eval_string(c); + xpath_string to = _right->_next->eval_string(c); + + translate(s.data(), from.c_str(), to.c_str()); + + return s; + } + + default: + { + switch (_rettype) + { + case xpath_type_boolean: + return xpath_string_const(eval_boolean(c) ? PUGIXML_TEXT("true") : PUGIXML_TEXT("false")); + + case xpath_type_number: + return convert_number_to_string(eval_number(c)); + + case xpath_type_node_set: + { + xpath_node_set ns = eval_node_set(c); + return ns.empty() ? xpath_string() : string_value(ns.first()); + } + + default: + assert(!"Wrong expression for return type string"); + return xpath_string(); + } + } + } + } + + xpath_node_set eval_node_set(const xpath_context& c) + { + switch (_type) + { + case ast_op_union: + { + xpath_node_set ls = _left->eval_node_set(c); + xpath_node_set rs = _right->eval_node_set(c); + + // we can optimize merging two sorted sets, but this is a very rare operation, so don't bother + ls._type = xpath_node_set::type_unsorted; + + ls.append(rs.begin(), rs.end()); + + ls.remove_duplicates(); + + return ls; + } + + case ast_filter: + case ast_filter_posinv: + { + xpath_node_set set = _left->eval_node_set(c); + + // either expression is a number or it contains position() call; sort by document order + if (_type == ast_filter) set.sort(); + + apply_predicate(set, 0, _right); + + return set; + } + + case ast_func_id: + return xpath_node_set(); + + case ast_step: + { + xpath_node_set ns; + + switch (_axis) + { + case axis_ancestor: + step_do(ns, c, axis_to_type<axis_ancestor>()); + break; + + case axis_ancestor_or_self: + step_do(ns, c, axis_to_type<axis_ancestor_or_self>()); + break; + + case axis_attribute: + step_do(ns, c, axis_to_type<axis_attribute>()); + break; + + case axis_child: + step_do(ns, c, axis_to_type<axis_child>()); + break; + + case axis_descendant: + step_do(ns, c, axis_to_type<axis_descendant>()); + break; + + case axis_descendant_or_self: + step_do(ns, c, axis_to_type<axis_descendant_or_self>()); + break; + + case axis_following: + step_do(ns, c, axis_to_type<axis_following>()); + break; + + case axis_following_sibling: + step_do(ns, c, axis_to_type<axis_following_sibling>()); + break; + + case axis_namespace: + step_do(ns, c, axis_to_type<axis_namespace>()); + break; + + case axis_parent: + step_do(ns, c, axis_to_type<axis_parent>()); + break; + + case axis_preceding: + step_do(ns, c, axis_to_type<axis_preceding>()); + break; + + case axis_preceding_sibling: + step_do(ns, c, axis_to_type<axis_preceding_sibling>()); + break; + + case axis_self: + step_do(ns, c, axis_to_type<axis_self>()); + break; + } + + ns.remove_duplicates(); + + return ns; + } + + case ast_step_root: + { + assert(!_right); // root step can't have any predicates + + xpath_node_set ns; + ns._type = xpath_node_set::type_sorted; + + if (c.n.node()) ns.push_back(c.n.node().root()); + else if (c.n.attribute()) ns.push_back(c.n.parent().root()); + + return ns; + } + + default: + assert(!"Wrong expression for return type node set"); + return xpath_node_set(); + } + } + + bool is_posinv() + { + switch (_type) + { + case ast_func_position: + return false; + + case ast_string_constant: + case ast_number_constant: + // $$ case ast_variable: + return true; + + case ast_step: + case ast_step_root: + return true; + + case ast_predicate: + case ast_filter: + case ast_filter_posinv: + return true; + + default: + if (_left && !_left->is_posinv()) return false; + + for (xpath_ast_node* n = _right; n; n = n->_next) + if (!n->is_posinv()) return false; + + return true; + } + } + + xpath_value_type rettype() const + { + return static_cast<xpath_value_type>(_rettype); + } + }; + + struct xpath_parser + { + xpath_allocator& _alloc; + xpath_lexer _lexer; + const char_t* _query; + xpath_parse_result* _result; + jmp_buf _error_handler; + + xpath_parser(const xpath_parser&); + xpath_parser& operator=(const xpath_parser&); + + void throw_error(const char* message) + { + _result->error = message; + _result->offset = _lexer.current_pos() - _query; + + longjmp(_error_handler, 1); + } + + void* alloc_node() + { + void* result = _alloc.allocate(sizeof(xpath_ast_node)); + + if (!result) throw_error("Out of memory"); + + return result; + } + + const char_t* alloc_string(const xpath_lexer_string& value) + { + if (value.begin) + { + size_t length = static_cast<size_t>(value.end - value.begin); + + char_t* c = static_cast<char_t*>(_alloc.allocate((length + 1) * sizeof(char_t))); + if (!c) throw_error("Out of memory"); + + memcpy(c, value.begin, length * sizeof(char_t)); + c[length] = 0; + + return c; + } + else return 0; + } + + xpath_ast_node* parse_function_helper(ast_type_t type0, ast_type_t type1, size_t argc, xpath_ast_node* args[2]) + { + assert(argc <= 1); + + if (argc == 1 && args[0]->rettype() != xpath_type_node_set) throw_error("Function has to be applied to node set"); + + return new (alloc_node()) xpath_ast_node(argc == 0 ? type0 : type1, xpath_type_string, args[0]); + } + + xpath_ast_node* parse_function(const xpath_lexer_string& name, size_t argc, xpath_ast_node* args[2]) + { + switch (name.begin[0]) + { + case 'b': + if (name == PUGIXML_TEXT("boolean") && argc == 1) + return new (alloc_node()) xpath_ast_node(ast_func_boolean, xpath_type_boolean, args[0]); + + break; + + case 'c': + if (name == PUGIXML_TEXT("count") && argc == 1) + { + if (args[0]->rettype() != xpath_type_node_set) throw_error("count() has to be applied to node set"); + return new (alloc_node()) xpath_ast_node(ast_func_count, xpath_type_number, args[0]); + } + else if (name == PUGIXML_TEXT("contains") && argc == 2) + return new (alloc_node()) xpath_ast_node(ast_func_contains, xpath_type_string, args[0], args[1]); + else if (name == PUGIXML_TEXT("concat") && argc >= 2) + return new (alloc_node()) xpath_ast_node(ast_func_concat, xpath_type_string, args[0], args[1]); + else if (name == PUGIXML_TEXT("ceiling") && argc == 1) + return new (alloc_node()) xpath_ast_node(ast_func_ceiling, xpath_type_number, args[0]); + + break; + + case 'f': + if (name == PUGIXML_TEXT("false") && argc == 0) + return new (alloc_node()) xpath_ast_node(ast_func_false, xpath_type_boolean); + else if (name == PUGIXML_TEXT("floor") && argc == 1) + return new (alloc_node()) xpath_ast_node(ast_func_floor, xpath_type_number, args[0]); + + break; + + case 'i': + if (name == PUGIXML_TEXT("id") && argc == 1) + return new (alloc_node()) xpath_ast_node(ast_func_id, xpath_type_node_set, args[0]); + + break; + + case 'l': + if (name == PUGIXML_TEXT("last") && argc == 0) + return new (alloc_node()) xpath_ast_node(ast_func_last, xpath_type_number); + else if (name == PUGIXML_TEXT("lang") && argc == 1) + return new (alloc_node()) xpath_ast_node(ast_func_lang, xpath_type_boolean, args[0]); + else if (name == PUGIXML_TEXT("local-name") && argc <= 1) + return parse_function_helper(ast_func_local_name_0, ast_func_local_name_1, argc, args); + + break; + + case 'n': + if (name == PUGIXML_TEXT("name") && argc <= 1) + return parse_function_helper(ast_func_name_0, ast_func_name_1, argc, args); + else if (name == PUGIXML_TEXT("namespace-uri") && argc <= 1) + return parse_function_helper(ast_func_namespace_uri_0, ast_func_namespace_uri_1, argc, args); + else if (name == PUGIXML_TEXT("normalize-space") && argc <= 1) + return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_normalize_space_0 : ast_func_normalize_space_1, xpath_type_string, args[0], args[1]); + else if (name == PUGIXML_TEXT("not") && argc == 1) + return new (alloc_node()) xpath_ast_node(ast_func_not, xpath_type_boolean, args[0]); + else if (name == PUGIXML_TEXT("number") && argc <= 1) + return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_number_0 : ast_func_number_1, xpath_type_number, args[0]); + + break; + + case 'p': + if (name == PUGIXML_TEXT("position") && argc == 0) + return new (alloc_node()) xpath_ast_node(ast_func_position, xpath_type_number); + + break; + + case 'r': + if (name == PUGIXML_TEXT("round") && argc == 1) + return new (alloc_node()) xpath_ast_node(ast_func_round, xpath_type_number, args[0]); + + break; + + case 's': + if (name == PUGIXML_TEXT("string") && argc <= 1) + return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_string_0 : ast_func_string_1, xpath_type_string, args[0]); + else if (name == PUGIXML_TEXT("string-length") && argc <= 1) + return new (alloc_node()) xpath_ast_node(argc == 0 ? ast_func_string_length_0 : ast_func_string_length_1, xpath_type_string, args[0]); + else if (name == PUGIXML_TEXT("starts-with") && argc == 2) + return new (alloc_node()) xpath_ast_node(ast_func_starts_with, xpath_type_boolean, args[0], args[1]); + else if (name == PUGIXML_TEXT("substring-before") && argc == 2) + return new (alloc_node()) xpath_ast_node(ast_func_substring_before, xpath_type_string, args[0], args[1]); + else if (name == PUGIXML_TEXT("substring-after") && argc == 2) + return new (alloc_node()) xpath_ast_node(ast_func_substring_after, xpath_type_string, args[0], args[1]); + else if (name == PUGIXML_TEXT("substring") && (argc == 2 || argc == 3)) + return new (alloc_node()) xpath_ast_node(argc == 2 ? ast_func_substring_2 : ast_func_substring_3, xpath_type_string, args[0], args[1]); + else if (name == PUGIXML_TEXT("sum") && argc == 1) + { + if (args[0]->rettype() != xpath_type_node_set) throw_error("sum() has to be applied to node set"); + return new (alloc_node()) xpath_ast_node(ast_func_sum, xpath_type_number, args[0]); + } + + break; + + case 't': + if (name == PUGIXML_TEXT("translate") && argc == 3) + return new (alloc_node()) xpath_ast_node(ast_func_translate, xpath_type_string, args[0], args[1]); + else if (name == PUGIXML_TEXT("true") && argc == 0) + return new (alloc_node()) xpath_ast_node(ast_func_true, xpath_type_boolean); + + break; + } + + throw_error("Unrecognized function or wrong parameter count"); + + return 0; + } + + axis_t parse_axis_name(const xpath_lexer_string& name, bool& specified) + { + specified = true; + + switch (name.begin[0]) + { + case 'a': + if (name == PUGIXML_TEXT("ancestor")) + return axis_ancestor; + else if (name == PUGIXML_TEXT("ancestor-or-self")) + return axis_ancestor_or_self; + else if (name == PUGIXML_TEXT("attribute")) + return axis_attribute; + + break; + + case 'c': + if (name == PUGIXML_TEXT("child")) + return axis_child; + + break; + + case 'd': + if (name == PUGIXML_TEXT("descendant")) + return axis_descendant; + else if (name == PUGIXML_TEXT("descendant-or-self")) + return axis_descendant_or_self; + + break; + + case 'f': + if (name == PUGIXML_TEXT("following")) + return axis_following; + else if (name == PUGIXML_TEXT("following-sibling")) + return axis_following_sibling; + + break; + + case 'n': + if (name == PUGIXML_TEXT("namespace")) + return axis_namespace; + + break; + + case 'p': + if (name == PUGIXML_TEXT("parent")) + return axis_parent; + else if (name == PUGIXML_TEXT("preceding")) + return axis_preceding; + else if (name == PUGIXML_TEXT("preceding-sibling")) + return axis_preceding_sibling; + + break; + + case 's': + if (name == PUGIXML_TEXT("self")) + return axis_self; + + break; + } + + specified = false; + return axis_child; + } + + nodetest_t parse_node_test_type(const xpath_lexer_string& name) + { + switch (name.begin[0]) + { + case 'c': + if (name == PUGIXML_TEXT("comment")) + return nodetest_type_comment; + + break; + + case 'n': + if (name == PUGIXML_TEXT("node")) + return nodetest_type_node; + + break; + + case 'p': + if (name == PUGIXML_TEXT("processing-instruction")) + return nodetest_type_pi; + + break; + + case 't': + if (name == PUGIXML_TEXT("text")) + return nodetest_type_text; + + break; + } + + return nodetest_none; + } + + // PrimaryExpr ::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall + xpath_ast_node* parse_primary_expression() + { + switch (_lexer.current()) + { + case lex_var_ref: + { + throw_error("Variables are not supported"); + + return 0; + } + + case lex_open_brace: + { + _lexer.next(); + + xpath_ast_node* n = parse_expression(); + + if (_lexer.current() != lex_close_brace) + throw_error("Unmatched braces"); + + _lexer.next(); + + return n; + } + + case lex_quoted_string: + { + const char_t* value = alloc_string(_lexer.contents()); + + xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_string_constant, xpath_type_string, value); + _lexer.next(); + + return n; + } + + case lex_number: + { + double value = 0; + + if (!convert_string_to_number(_lexer.contents().begin, _lexer.contents().end, &value)) + throw_error("Out of memory"); + + xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_number_constant, xpath_type_number, value); + _lexer.next(); + + return n; + } + + case lex_string: + { + xpath_ast_node* args[2] = {0}; + size_t argc = 0; + + xpath_lexer_string function = _lexer.contents(); + _lexer.next(); + + xpath_ast_node* last_arg = 0; + + if (_lexer.current() != lex_open_brace) + throw_error("Unrecognized function call"); + _lexer.next(); + + if (_lexer.current() != lex_close_brace) + args[argc++] = parse_expression(); + + while (_lexer.current() != lex_close_brace) + { + if (_lexer.current() != lex_comma) + throw_error("No comma between function arguments"); + _lexer.next(); + + xpath_ast_node* n = parse_expression(); + + if (argc < 2) args[argc] = n; + else last_arg->set_next(n); + + argc++; + last_arg = n; + } + + _lexer.next(); + + return parse_function(function, argc, args); + } + + default: + throw_error("Unrecognizable primary expression"); + + return 0; + } + } + + // FilterExpr ::= PrimaryExpr | FilterExpr Predicate + // Predicate ::= '[' PredicateExpr ']' + // PredicateExpr ::= Expr + xpath_ast_node* parse_filter_expression() + { + xpath_ast_node* n = parse_primary_expression(); + + while (_lexer.current() == lex_open_square_brace) + { + _lexer.next(); + + xpath_ast_node* expr = parse_expression(); + + if (n->rettype() != xpath_type_node_set) throw_error("Predicate has to be applied to node set"); + + bool posinv = expr->rettype() != xpath_type_number && expr->is_posinv(); + + n = new (alloc_node()) xpath_ast_node(posinv ? ast_filter_posinv : ast_filter, xpath_type_node_set, n, expr); + + if (_lexer.current() != lex_close_square_brace) + throw_error("Unmatched square brace"); + + _lexer.next(); + } + + return n; + } + + // Step ::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep + // AxisSpecifier ::= AxisName '::' | '@'? + // NodeTest ::= NameTest | NodeType '(' ')' | 'processing-instruction' '(' Literal ')' + // NameTest ::= '*' | NCName ':' '*' | QName + // AbbreviatedStep ::= '.' | '..' + xpath_ast_node* parse_step(xpath_ast_node* set) + { + if (set && set->rettype() != xpath_type_node_set) + throw_error("Step has to be applied to node set"); + + bool axis_specified = false; + axis_t axis = axis_child; // implied child axis + + if (_lexer.current() == lex_axis_attribute) + { + axis = axis_attribute; + axis_specified = true; + + _lexer.next(); + } + else if (_lexer.current() == lex_dot) + { + _lexer.next(); + + return new (alloc_node()) xpath_ast_node(ast_step, set, axis_self, nodetest_type_node, 0); + } + else if (_lexer.current() == lex_double_dot) + { + _lexer.next(); + + return new (alloc_node()) xpath_ast_node(ast_step, set, axis_parent, nodetest_type_node, 0); + } + + nodetest_t nt_type = nodetest_none; + xpath_lexer_string nt_name; + + if (_lexer.current() == lex_string) + { + // node name test + nt_name = _lexer.contents(); + _lexer.next(); + + // was it an axis name? + if (_lexer.current() == lex_double_colon) + { + // parse axis name + if (axis_specified) throw_error("Two axis specifiers in one step"); + + axis = parse_axis_name(nt_name, axis_specified); + + if (!axis_specified) throw_error("Unknown axis"); + + // read actual node test + _lexer.next(); + + if (_lexer.current() == lex_multiply) + { + nt_type = nodetest_all; + nt_name = xpath_lexer_string(); + _lexer.next(); + } + else if (_lexer.current() == lex_string) + { + nt_name = _lexer.contents(); + _lexer.next(); + } + else throw_error("Unrecognized node test"); + } + + if (nt_type == nodetest_none) + { + // node type test or processing-instruction + if (_lexer.current() == lex_open_brace) + { + _lexer.next(); + + if (_lexer.current() == lex_close_brace) + { + _lexer.next(); + + nt_type = parse_node_test_type(nt_name); + + if (nt_type == nodetest_none) throw_error("Unrecognized node type"); + + nt_name = xpath_lexer_string(); + } + else if (nt_name == PUGIXML_TEXT("processing-instruction")) + { + if (_lexer.current() != lex_quoted_string) + throw_error("Only literals are allowed as arguments to processing-instruction()"); + + nt_type = nodetest_pi; + nt_name = _lexer.contents(); + _lexer.next(); + + if (_lexer.current() != lex_close_brace) + throw_error("Unmatched brace near processing-instruction()"); + _lexer.next(); + } + else + throw_error("Unmatched brace near node type test"); + + } + // QName or NCName:* + else + { + const char_t* colon_pos = pstd::find(nt_name.begin, nt_name.end, ':'); + + if (colon_pos + 2 == nt_name.end && colon_pos[1] == '*') // NCName:* + { + nt_name.end--; // erase * + + nt_type = nodetest_all_in_namespace; + } + else nt_type = nodetest_name; + } + } + } + else if (_lexer.current() == lex_multiply) + { + nt_type = nodetest_all; + _lexer.next(); + } + else throw_error("Unrecognized node test"); + + xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step, set, axis, nt_type, alloc_string(nt_name)); + + xpath_ast_node* last = 0; + + while (_lexer.current() == lex_open_square_brace) + { + _lexer.next(); + + xpath_ast_node* expr = parse_expression(); + + xpath_ast_node* pred = new (alloc_node()) xpath_ast_node(ast_predicate, xpath_type_node_set, expr); + + if (_lexer.current() != lex_close_square_brace) + throw_error("Unmatched square brace"); + _lexer.next(); + + if (last) last->set_next(pred); + else n->set_right(pred); + + last = pred; + } + + return n; + } + + // RelativeLocationPath ::= Step | RelativeLocationPath '/' Step | RelativeLocationPath '//' Step + xpath_ast_node* parse_relative_location_path(xpath_ast_node* set) + { + xpath_ast_node* n = parse_step(set); + + while (_lexer.current() == lex_slash || _lexer.current() == lex_double_slash) + { + lexeme_t l = _lexer.current(); + _lexer.next(); + + if (l == lex_double_slash) + n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0); + + n = parse_step(n); + } + + return n; + } + + // LocationPath ::= RelativeLocationPath | AbsoluteLocationPath + // AbsoluteLocationPath ::= '/' RelativeLocationPath? | '//' RelativeLocationPath + xpath_ast_node* parse_location_path() + { + if (_lexer.current() == lex_slash) + { + _lexer.next(); + + xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step_root, xpath_type_node_set); + + // relative location path can start from axis_attribute, dot, double_dot, multiply and string lexemes; any other lexeme means standalone root path + lexeme_t l = _lexer.current(); + + if (l == lex_string || l == lex_axis_attribute || l == lex_dot || l == lex_double_dot || l == lex_multiply) + return parse_relative_location_path(n); + else + return n; + } + else if (_lexer.current() == lex_double_slash) + { + _lexer.next(); + + xpath_ast_node* n = new (alloc_node()) xpath_ast_node(ast_step_root, xpath_type_node_set); + n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0); + + return parse_relative_location_path(n); + } + else + { + return parse_relative_location_path(0); + } + } + + // PathExpr ::= LocationPath + // | FilterExpr + // | FilterExpr '/' RelativeLocationPath + // | FilterExpr '//' RelativeLocationPath + xpath_ast_node* parse_path_expression() + { + // Clarification. + // PathExpr begins with either LocationPath or FilterExpr. + // FilterExpr begins with PrimaryExpr + // PrimaryExpr begins with '$' in case of it being a variable reference, + // '(' in case of it being an expression, string literal, number constant or + // function call. + + if (_lexer.current() == lex_var_ref || _lexer.current() == lex_open_brace || + _lexer.current() == lex_quoted_string || _lexer.current() == lex_number || + _lexer.current() == lex_string) + { + if (_lexer.current() == lex_string) + { + // This is either a function call, or not - if not, we shall proceed with location path + const char_t* state = _lexer.state(); + + while (IS_CHARTYPEX(*state, ctx_space)) ++state; + + if (*state != '(') return parse_location_path(); + + // This looks like a function call; however this still can be a node-test. Check it. + if (parse_node_test_type(_lexer.contents()) != nodetest_none) return parse_location_path(); + } + + xpath_ast_node* n = parse_filter_expression(); + + if (_lexer.current() == lex_slash || _lexer.current() == lex_double_slash) + { + lexeme_t l = _lexer.current(); + _lexer.next(); + + if (l == lex_double_slash) + { + if (n->rettype() != xpath_type_node_set) throw_error("Step has to be applied to node set"); + + n = new (alloc_node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, 0); + } + + // select from location path + return parse_relative_location_path(n); + } + + return n; + } + else return parse_location_path(); + } + + // UnionExpr ::= PathExpr | UnionExpr '|' PathExpr + xpath_ast_node* parse_union_expression() + { + xpath_ast_node* n = parse_path_expression(); + + while (_lexer.current() == lex_union) + { + _lexer.next(); + + xpath_ast_node* expr = parse_union_expression(); + + if (n->rettype() != xpath_type_node_set || expr->rettype() != xpath_type_node_set) + throw_error("Union operator has to be applied to node sets"); + + n = new (alloc_node()) xpath_ast_node(ast_op_union, xpath_type_node_set, n, expr); + } + + return n; + } + + // UnaryExpr ::= UnionExpr | '-' UnaryExpr + xpath_ast_node* parse_unary_expression() + { + if (_lexer.current() == lex_minus) + { + _lexer.next(); + + xpath_ast_node* expr = parse_unary_expression(); + + return new (alloc_node()) xpath_ast_node(ast_op_negate, xpath_type_number, expr); + } + else return parse_union_expression(); + } + + // MultiplicativeExpr ::= UnaryExpr + // | MultiplicativeExpr '*' UnaryExpr + // | MultiplicativeExpr 'div' UnaryExpr + // | MultiplicativeExpr 'mod' UnaryExpr + xpath_ast_node* parse_multiplicative_expression() + { + xpath_ast_node* n = parse_unary_expression(); + + while (_lexer.current() == lex_multiply || (_lexer.current() == lex_string && + (_lexer.contents() == PUGIXML_TEXT("mod") || _lexer.contents() == PUGIXML_TEXT("div")))) + { + ast_type_t op = _lexer.current() == lex_multiply ? ast_op_multiply : + _lexer.contents().begin[0] == 'd' ? ast_op_divide : ast_op_mod; + _lexer.next(); + + xpath_ast_node* expr = parse_unary_expression(); + + n = new (alloc_node()) xpath_ast_node(op, xpath_type_number, n, expr); + } + + return n; + } + + // AdditiveExpr ::= MultiplicativeExpr + // | AdditiveExpr '+' MultiplicativeExpr + // | AdditiveExpr '-' MultiplicativeExpr + xpath_ast_node* parse_additive_expression() + { + xpath_ast_node* n = parse_multiplicative_expression(); + + while (_lexer.current() == lex_plus || _lexer.current() == lex_minus) + { + lexeme_t l = _lexer.current(); + + _lexer.next(); + + xpath_ast_node* expr = parse_multiplicative_expression(); + + n = new (alloc_node()) xpath_ast_node(l == lex_plus ? ast_op_add : ast_op_subtract, xpath_type_number, n, expr); + } + + return n; + } + + // RelationalExpr ::= AdditiveExpr + // | RelationalExpr '<' AdditiveExpr + // | RelationalExpr '>' AdditiveExpr + // | RelationalExpr '<=' AdditiveExpr + // | RelationalExpr '>=' AdditiveExpr + xpath_ast_node* parse_relational_expression() + { + xpath_ast_node* n = parse_additive_expression(); + + while (_lexer.current() == lex_less || _lexer.current() == lex_less_or_equal || + _lexer.current() == lex_greater || _lexer.current() == lex_greater_or_equal) + { + lexeme_t l = _lexer.current(); + _lexer.next(); + + xpath_ast_node* expr = parse_additive_expression(); + + n = new (alloc_node()) xpath_ast_node(l == lex_less ? ast_op_less : l == lex_greater ? ast_op_greater : + l == lex_less_or_equal ? ast_op_less_or_equal : ast_op_greater_or_equal, xpath_type_boolean, n, expr); + } + + return n; + } + + // EqualityExpr ::= RelationalExpr + // | EqualityExpr '=' RelationalExpr + // | EqualityExpr '!=' RelationalExpr + xpath_ast_node* parse_equality_expression() + { + xpath_ast_node* n = parse_relational_expression(); + + while (_lexer.current() == lex_equal || _lexer.current() == lex_not_equal) + { + lexeme_t l = _lexer.current(); + + _lexer.next(); + + xpath_ast_node* expr = parse_relational_expression(); + + n = new (alloc_node()) xpath_ast_node(l == lex_equal ? ast_op_equal : ast_op_not_equal, xpath_type_boolean, n, expr); + } + + return n; + } + + // AndExpr ::= EqualityExpr | AndExpr 'and' EqualityExpr + xpath_ast_node* parse_and_expression() + { + xpath_ast_node* n = parse_equality_expression(); + + while (_lexer.current() == lex_string && _lexer.contents() == PUGIXML_TEXT("and")) + { + _lexer.next(); + + xpath_ast_node* expr = parse_equality_expression(); + + n = new (alloc_node()) xpath_ast_node(ast_op_and, xpath_type_boolean, n, expr); + } + + return n; + } + + // OrExpr ::= AndExpr | OrExpr 'or' AndExpr + xpath_ast_node* parse_or_expression() + { + xpath_ast_node* n = parse_and_expression(); + + while (_lexer.current() == lex_string && _lexer.contents() == PUGIXML_TEXT("or")) + { + _lexer.next(); + + xpath_ast_node* expr = parse_and_expression(); + + n = new (alloc_node()) xpath_ast_node(ast_op_or, xpath_type_boolean, n, expr); + } + + return n; + } + + // Expr ::= OrExpr + xpath_ast_node* parse_expression() + { + return parse_or_expression(); + } + + xpath_parser(const char_t* query, xpath_allocator& alloc, xpath_parse_result* result): _alloc(alloc), _lexer(query), _query(query), _result(result) + { + } + + xpath_ast_node* parse() + { + xpath_ast_node* result = parse_expression(); + + if (_lexer.current() != lex_eof) + { + // there are still unparsed tokens left, error + throw_error("Incorrect query"); + } + + return result; + } + + static xpath_ast_node* parse(const char_t* query, xpath_allocator& alloc, xpath_parse_result* result) + { + xpath_parser parser(query, alloc, result); + + int error = setjmp(parser._error_handler); + + return (error == 0) ? parser.parse() : 0; + } + }; + + const char* xpath_parse_result::description() const + { + return error ? error : "No error"; + } + + xpath_query::xpath_query(const char_t* query): _alloc(0), _root(0) + { + _result.error = 0; + _result.offset = 0; + + _alloc = xpath_allocator::create(); + + if (!_alloc) + { + _result.error = "Out of memory"; + } + else + { + _root = xpath_parser::parse(query, *_alloc, &_result); + } + + if (!_root) + { + xpath_allocator::destroy(_alloc); + _alloc = 0; + + #ifndef PUGIXML_NO_EXCEPTIONS + throw xpath_exception(_result); + #endif + } + } + + xpath_query::~xpath_query() + { + xpath_allocator::destroy(_alloc); + } + + xpath_value_type xpath_query::return_type() const + { + if (!_root) return xpath_type_none; + + return _root->rettype(); + } + + bool xpath_query::evaluate_boolean(const xpath_node& n) const + { + if (!_root) return false; + + xpath_context c(n, 1, 1); + + return _root->eval_boolean(c); + } + + double xpath_query::evaluate_number(const xpath_node& n) const + { + if (!_root) return gen_nan(); + + xpath_context c(n, 1, 1); + + return _root->eval_number(c); + } + +#ifndef PUGIXML_NO_STL + string_t xpath_query::evaluate_string(const xpath_node& n) const + { + if (!_root) return string_t(); + + xpath_context c(n, 1, 1); + + return _root->eval_string(c).c_str(); + } +#endif + + size_t xpath_query::evaluate_string(char_t* buffer, size_t capacity, const xpath_node& n) const + { + xpath_context c(n, 1, 1); + xpath_string r = _root ? _root->eval_string(c) : xpath_string(); + + size_t size = r.length() + 1; + + // $$ zero-terminate? + if (capacity > 0) memcpy(buffer, r.c_str(), (size < capacity ? size : capacity) * sizeof(char_t)); + + return size; + } + + xpath_node_set xpath_query::evaluate_node_set(const xpath_node& n) const + { + if (!_root) return xpath_node_set(); + + if (_root->rettype() != xpath_type_node_set) + { + #ifdef PUGIXML_NO_EXCEPTIONS + return xpath_node_set(); + #else + xpath_parse_result result = {"Expression does not evaluate to node set", 0}; + throw xpath_exception(result); + #endif + } + + xpath_context c(n, 1, 1); + + return _root->eval_node_set(c); + } + + const xpath_parse_result& xpath_query::result() const + { + return _result; + } + + xpath_query::operator unspecified_bool_type() const + { + return _root ? &xpath_query::_root : 0; + } + + bool xpath_query::operator!() const + { + return !_root; + } + + xpath_node xml_node::select_single_node(const char_t* query) const + { + xpath_query q(query); + return select_single_node(q); + } + + xpath_node xml_node::select_single_node(const xpath_query& query) const + { + xpath_node_set s = query.evaluate_node_set(*this); + return s.empty() ? xpath_node() : s.first(); + } + + xpath_node_set xml_node::select_nodes(const char_t* query) const + { + xpath_query q(query); + return select_nodes(q); + } + + xpath_node_set xml_node::select_nodes(const xpath_query& query) const + { + return query.evaluate_node_set(*this); + } +} + +#endif + /** * Copyright (c) 2006-2010 Arseny Kapoulkine * |