diff options
| -rw-r--r-- | src/pugixml.hpp | 239 | ||||
| -rw-r--r-- | src/pugixpath.cpp | 150 |
2 files changed, 242 insertions, 147 deletions
diff --git a/src/pugixml.hpp b/src/pugixml.hpp index 28e9a34..ce48a45 100644 --- a/src/pugixml.hpp +++ b/src/pugixml.hpp @@ -56,13 +56,13 @@ namespace std # endif #endif -// No XPath without STL or exceptions -#if (defined(PUGIXML_NO_STL) || defined(PUGIXML_NO_EXCEPTIONS)) && !defined(PUGIXML_NO_XPATH) +// No XPath without STL +#if !defined(PUGIXML_NO_XPATH) && defined(PUGIXML_NO_STL) # define PUGIXML_NO_XPATH #endif // Include exception header for XPath -#ifndef PUGIXML_NO_XPATH +#if !defined(PUGIXML_NO_XPATH) && !defined(PUGIXML_NO_EXCEPTIONS) # include <exception> #endif @@ -339,102 +339,9 @@ namespace pugi #ifndef PUGIXML_NO_XPATH class xpath_node; class xpath_node_set; - class xpath_ast_node; - class xpath_allocator; - - /// XPath query return type classification - enum xpath_value_type - { - xpath_type_none, ///< Unknown type (query failed to compile) - xpath_type_node_set, ///< Node set (xpath_node_set) - xpath_type_number, ///< Number - xpath_type_string, ///< String - xpath_type_boolean ///< Boolean - }; - - /// XPath query return type classification - /// \deprecated This type is deprecated and will be removed in future versions; use xpath_value_type instead - typedef xpath_value_type xpath_type_t; - - /** - * A class that holds compiled XPath query and allows to evaluate query result - */ - class PUGIXML_CLASS xpath_query - { - private: - // Non-copyable semantics - xpath_query(const xpath_query&); - xpath_query& operator=(const xpath_query&); - - xpath_allocator* m_alloc; - xpath_ast_node* m_root; - - public: - /** - * Constructor from string with XPath expression. - * Throws xpath_exception on compilation error, std::bad_alloc on out of memory error. - * - * \param query - string with XPath expression - */ - explicit xpath_query(const char_t* query); - - /** - * Destructor - */ - ~xpath_query(); - - /** - * Get query expression return type - * - * \return expression return type - **/ - xpath_value_type return_type() const; - - /** - * Evaluate expression as boolean value for the context node \a n. - * If expression does not directly evaluate to boolean, the expression result is converted - * as through boolean() XPath function call. - * Throws std::bad_alloc on out of memory error. - * - * \param n - context node - * \return evaluation result - */ - bool evaluate_boolean(const xml_node& n) const; - - /** - * Evaluate expression as double value for the context node \a n. - * If expression does not directly evaluate to double, the expression result is converted - * as through number() XPath function call. - * Throws std::bad_alloc on out of memory error. - * - * \param n - context node - * \return evaluation result - */ - double evaluate_number(const xml_node& n) const; - - /** - * Evaluate expression as string value for the context node \a n. - * If expression does not directly evaluate to string, the expression result is converted - * as through string() XPath function call. - * Throws std::bad_alloc on out of memory error. - * - * \param n - context node - * \return evaluation result - */ - string_t evaluate_string(const xml_node& n) const; - - /** - * Evaluate expression as node set for the context node \a n. - * If expression does not directly evaluate to node set, throws xpath_exception. - * Throws std::bad_alloc on out of memory error. - * - * \param n - context node - * \return evaluation result - */ - xpath_node_set evaluate_node_set(const xml_node& n) const; - }; + class xpath_query; #endif - + /** * Abstract writer class * \see xml_node::print @@ -2016,21 +1923,146 @@ namespace pugi }; #ifndef PUGIXML_NO_XPATH + class xpath_ast_node; + class xpath_allocator; + + /// XPath query return type classification + enum xpath_value_type + { + xpath_type_none, ///< Unknown type (query failed to compile) + xpath_type_node_set, ///< Node set (xpath_node_set) + xpath_type_number, ///< Number + xpath_type_string, ///< String + xpath_type_boolean ///< Boolean + }; + + /// XPath query return type classification + /// \deprecated This type is deprecated and will be removed in future versions; use xpath_value_type instead + typedef xpath_value_type xpath_type_t; + + struct PUGIXML_CLASS xpath_parse_result + { + /// Error message (0 if no error) + const char* error; + + /// Last parsed offset (in characters from string start) + ptrdiff_t offset; + + /// Cast to bool operator + operator bool() const + { + return error == 0; + } + + /// Get error description + const char* description() const; + }; + + /** + * A class that holds compiled XPath query and allows to evaluate query result + */ + class PUGIXML_CLASS xpath_query + { + private: + // Non-copyable semantics + xpath_query(const xpath_query&); + xpath_query& operator=(const xpath_query&); + + xpath_allocator* m_alloc; + xpath_ast_node* m_root; + xpath_parse_result _result; + + typedef xpath_ast_node* xpath_query::*unspecified_bool_type; + + public: + /** + * Constructor from string with XPath expression. + * Throws xpath_exception on compilation error, std::bad_alloc on out of memory error. + * + * \param query - string with XPath expression + */ + explicit xpath_query(const char_t* query); + + /** + * Destructor + */ + ~xpath_query(); + + /** + * Get query expression return type + * + * \return expression return type + **/ + xpath_value_type return_type() const; + + /** + * Evaluate expression as boolean value for the context node \a n. + * If expression does not directly evaluate to boolean, the expression result is converted + * as through boolean() XPath function call. + * Throws std::bad_alloc on out of memory error. + * + * \param n - context node + * \return evaluation result + */ + bool evaluate_boolean(const xml_node& n) const; + + /** + * Evaluate expression as double value for the context node \a n. + * If expression does not directly evaluate to double, the expression result is converted + * as through number() XPath function call. + * Throws std::bad_alloc on out of memory error. + * + * \param n - context node + * \return evaluation result + */ + double evaluate_number(const xml_node& n) const; + + /** + * Evaluate expression as string value for the context node \a n. + * If expression does not directly evaluate to string, the expression result is converted + * as through string() XPath function call. + * Throws std::bad_alloc on out of memory error. + * + * \param n - context node + * \return evaluation result + */ + string_t evaluate_string(const xml_node& n) const; + + /** + * Evaluate expression as node set for the context node \a n. + * If expression does not directly evaluate to node set, throws xpath_exception. + * Throws std::bad_alloc on out of memory error. + * + * \param n - context node + * \return evaluation result + */ + xpath_node_set evaluate_node_set(const xml_node& n) const; + + // Get parsing result + const xpath_parse_result& result() const; + + // Safe bool conversion + operator unspecified_bool_type() const; + + // Borland C++ workaround + bool operator!() const; + }; + + #ifndef PUGIXML_NO_EXCEPTIONS /** * XPath exception class. */ class PUGIXML_CLASS xpath_exception: public std::exception { private: - const char* m_message; + xpath_parse_result _result; public: /** - * Construct exception from static error string + * Construct exception from parse result * - * \param message - error string */ - explicit xpath_exception(const char* message); + explicit xpath_exception(const xpath_parse_result& result); /** * Return error message @@ -2038,7 +2070,10 @@ namespace pugi * \return error message */ virtual const char* what() const throw(); + + const xpath_parse_result& result() const; }; + #endif /** * XPath node class. diff --git a/src/pugixpath.cpp b/src/pugixpath.cpp index 450a907..732a3c6 100644 --- a/src/pugixpath.cpp +++ b/src/pugixpath.cpp @@ -19,6 +19,7 @@ #include <stdio.h> #include <string.h> #include <assert.h> +#include <setjmp.h> #include <ctype.h> #include <math.h> #include <float.h> @@ -36,6 +37,8 @@ typedef __int32 int32_t; #if defined(_MSC_VER) # pragma warning(disable: 4127) // conditional expression is constant +# pragma warning(disable: 4611) // interaction between '_setjmp' and C++ object destruction is non-portable +# pragma warning(disable: 4324) // structure was padded due to __declspec(align()) # pragma warning(disable: 4996) // this function or variable may be unsafe #endif @@ -48,7 +51,6 @@ typedef __int32 int32_t; #endif #include <algorithm> -#include <memory> #include <string> // String utilities prototypes @@ -601,14 +603,22 @@ namespace namespace pugi { - xpath_exception::xpath_exception(const char* message): m_message(message) +#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 m_message; + return _result.error; } + + const xpath_parse_result& xpath_exception::result() const + { + return _result; + } +#endif const size_t xpath_memory_block_size = 4096; ///< Memory block size, 4 kb @@ -2554,20 +2564,29 @@ namespace pugi return alloc(sizeof(xpath_ast_node)); } - class xpath_parser + struct xpath_parser { - private: xpath_allocator& m_alloc; xpath_lexer m_lexer; + xpath_parse_result* m_result; + jmp_buf m_error_handler; xpath_parser(const xpath_parser&); xpath_parser& operator=(const xpath_parser&); + void throw_error(const char* message) + { + m_result->error = message; + m_result->offset = 0; // $$$ lexer + + longjmp(m_error_handler, 1); + } + 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 xpath_exception("Function has to be applied to node set"); + if (argc == 1 && args[0]->rettype() != xpath_type_node_set) throw_error("Function has to be applied to node set"); return new (m_alloc.node()) xpath_ast_node(argc == 0 ? type0 : type1, xpath_type_string, args[0]); } @@ -2585,7 +2604,7 @@ namespace pugi case 'c': if (name == PUGIXML_TEXT("count") && argc == 1) { - if (args[0]->rettype() != xpath_type_node_set) throw xpath_exception("count() has to be applied to node set"); + if (args[0]->rettype() != xpath_type_node_set) throw_error("count() has to be applied to node set"); return new (m_alloc.node()) xpath_ast_node(ast_func_count, xpath_type_number, args[0]); } else if (name == PUGIXML_TEXT("contains") && argc == 2) @@ -2662,7 +2681,7 @@ namespace pugi return new (m_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 xpath_exception("sum() has to be applied to node set"); + if (args[0]->rettype() != xpath_type_node_set) throw_error("sum() has to be applied to node set"); return new (m_alloc.node()) xpath_ast_node(ast_func_sum, xpath_type_number, args[0]); } @@ -2677,11 +2696,9 @@ namespace pugi break; } - throw xpath_exception("Unrecognized function or wrong parameter count"); + throw_error("Unrecognized function or wrong parameter count"); - #ifdef __DMC__ - return 0; // Digital Mars C++ - #endif + return 0; } axis_t parse_axis_name(const xpath_lexer_string& name, bool& specified) @@ -2788,11 +2805,9 @@ namespace pugi { case lex_var_ref: { - throw xpath_exception("Variables are not supported"); + throw_error("Variables are not supported"); - #ifdef __DMC__ - return 0; // Digital Mars C++ - #endif + return 0; } case lex_open_brace: @@ -2802,7 +2817,7 @@ namespace pugi xpath_ast_node* n = parse_expression(); if (m_lexer.current() != lex_close_brace) - throw xpath_exception("Unmatched braces"); + throw_error("Unmatched braces"); m_lexer.next(); @@ -2838,7 +2853,7 @@ namespace pugi xpath_ast_node* last_arg = 0; if (m_lexer.current() != lex_open_brace) - throw xpath_exception("Unrecognized function call"); + throw_error("Unrecognized function call"); m_lexer.next(); if (m_lexer.current() != lex_close_brace) @@ -2847,7 +2862,7 @@ namespace pugi while (m_lexer.current() != lex_close_brace) { if (m_lexer.current() != lex_comma) - throw xpath_exception("No comma between function arguments"); + throw_error("No comma between function arguments"); m_lexer.next(); xpath_ast_node* n = parse_expression(); @@ -2865,10 +2880,9 @@ namespace pugi } default: - throw xpath_exception("Unrecognizable primary expression"); - #ifdef __DMC__ - return 0; // Digital Mars C++ - #endif + throw_error("Unrecognizable primary expression"); + + return 0; } } @@ -2885,14 +2899,14 @@ namespace pugi xpath_ast_node* expr = parse_expression(); - if (n->rettype() != xpath_type_node_set) throw xpath_exception("Predicate has to be applied to node set"); + 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 (m_alloc.node()) xpath_ast_node(posinv ? ast_filter_posinv : ast_filter, xpath_type_node_set, n, expr); if (m_lexer.current() != lex_close_square_brace) - throw xpath_exception("Unmatched square brace"); + throw_error("Unmatched square brace"); m_lexer.next(); } @@ -2908,7 +2922,7 @@ namespace pugi xpath_ast_node* parse_step(xpath_ast_node* set) { if (set && set->rettype() != xpath_type_node_set) - throw xpath_exception("Step has to be applied to node set"); + throw_error("Step has to be applied to node set"); bool axis_specified = false; axis_t axis = axis_child; // implied child axis @@ -2946,11 +2960,11 @@ namespace pugi if (m_lexer.current() == lex_double_colon) { // parse axis name - if (axis_specified) throw xpath_exception("Two axis specifiers in one step"); + if (axis_specified) throw_error("Two axis specifiers in one step"); axis = parse_axis_name(nt_name, axis_specified); - if (!axis_specified) throw xpath_exception("Unknown axis"); + if (!axis_specified) throw_error("Unknown axis"); // read actual node test m_lexer.next(); @@ -2966,7 +2980,7 @@ namespace pugi nt_name = m_lexer.contents(); m_lexer.next(); } - else throw xpath_exception("Unrecognized node test"); + else throw_error("Unrecognized node test"); } if (nt_type == nodetest_none) @@ -2982,25 +2996,25 @@ namespace pugi nt_type = parse_node_test_type(nt_name); - if (nt_type == nodetest_none) throw xpath_exception("Unrecognized node type"); + if (nt_type == nodetest_none) throw_error("Unrecognized node type"); nt_name = xpath_lexer_string(); } else if (nt_name == PUGIXML_TEXT("processing-instruction")) { if (m_lexer.current() != lex_quoted_string) - throw xpath_exception("Only literals are allowed as arguments to processing-instruction()"); + throw_error("Only literals are allowed as arguments to processing-instruction()"); nt_type = nodetest_pi; nt_name = m_lexer.contents(); m_lexer.next(); if (m_lexer.current() != lex_close_brace) - throw xpath_exception("Unmatched brace near processing-instruction()"); + throw_error("Unmatched brace near processing-instruction()"); m_lexer.next(); } else - throw xpath_exception("Unmatched brace near node type test"); + throw_error("Unmatched brace near node type test"); } // QName or NCName:* @@ -3023,7 +3037,7 @@ namespace pugi nt_type = nodetest_all; m_lexer.next(); } - else throw xpath_exception("Unrecognized node test"); + else throw_error("Unrecognized node test"); xpath_ast_node* n = new (m_alloc.node()) xpath_ast_node(ast_step, set, axis, nt_type, nt_name, m_alloc); @@ -3038,7 +3052,7 @@ namespace pugi xpath_ast_node* pred = new (m_alloc.node()) xpath_ast_node(ast_predicate, xpath_type_node_set, expr); if (m_lexer.current() != lex_close_square_brace) - throw xpath_exception("Unmatched square brace"); + throw_error("Unmatched square brace"); m_lexer.next(); if (last) last->set_next(pred); @@ -3141,7 +3155,7 @@ namespace pugi if (l == lex_double_slash) { - if (n->rettype() != xpath_type_node_set) throw xpath_exception("Step has to be applied to node set"); + if (n->rettype() != xpath_type_node_set) throw_error("Step has to be applied to node set"); n = new (m_alloc.node()) xpath_ast_node(ast_step, n, axis_descendant_or_self, nodetest_type_node, xpath_lexer_string(), m_alloc); } @@ -3167,7 +3181,7 @@ namespace pugi xpath_ast_node* expr = parse_union_expression(); if (n->rettype() != xpath_type_node_set || expr->rettype() != xpath_type_node_set) - throw xpath_exception("Union operator has to be applied to node sets"); + throw_error("Union operator has to be applied to node sets"); n = new (m_alloc.node()) xpath_ast_node(ast_op_union, xpath_type_node_set, n, expr); } @@ -3318,8 +3332,7 @@ namespace pugi return parse_or_expression(); } - public: - explicit xpath_parser(const char_t* query, xpath_allocator& alloc): m_alloc(alloc), m_lexer(query) + xpath_parser(const char_t* query, xpath_allocator& alloc, xpath_parse_result* result): m_alloc(alloc), m_lexer(query), m_result(result) { } @@ -3330,21 +3343,44 @@ namespace pugi if (m_lexer.current() != lex_eof) { // there are still unparsed tokens left, error - throw xpath_exception("Incorrect query"); + throw_error("Incorrect query"); } return result; } }; + const char* xpath_parse_result::description() const + { + return error ? error : "Success"; + } + xpath_query::xpath_query(const char_t* query): m_alloc(0), m_root(0) { - std::auto_ptr<xpath_allocator> alloc(new xpath_allocator); + m_alloc = new xpath_allocator; + + xpath_parser parser(query, *m_alloc, &_result); - xpath_parser p(query, *alloc); + int error = setjmp(parser.m_error_handler); - m_root = p.parse(); - m_alloc = alloc.release(); + if (error == 0) + { + m_root = parser.parse(); + + _result.error = 0; + _result.offset = 0; + } + else + { + delete m_alloc; + + m_root = 0; + m_alloc = 0; + + #ifndef PUGIXML_NO_EXCEPTIONS + throw xpath_exception(_result); + #endif + } } xpath_query::~xpath_query() @@ -3389,13 +3425,37 @@ namespace pugi xpath_node_set xpath_query::evaluate_node_set(const xml_node& n) const { if (!m_root) return xpath_node_set(); - if (m_root->rettype() != xpath_type_node_set) throw xpath_exception("Expression does not evaluate to node set"); + + if (m_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 m_root->eval_node_set(c); } + const xpath_parse_result& xpath_query::result() const + { + return _result; + } + + xpath_query::operator unspecified_bool_type() const + { + return m_root ? &xpath_query::m_root : 0; + } + + bool xpath_query::operator!() const + { + return !m_root; + } + xpath_node xml_node::select_single_node(const char_t* query) const { xpath_query q(query); |