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-rw-r--r--src/pugixml.hpp19
-rw-r--r--src/pugixpath.cpp148
-rw-r--r--tests/test_xpath_api.cpp8
3 files changed, 99 insertions, 76 deletions
diff --git a/src/pugixml.hpp b/src/pugixml.hpp
index 4fba668..4c447dc 100644
--- a/src/pugixml.hpp
+++ b/src/pugixml.hpp
@@ -258,6 +258,16 @@ namespace pugi
class xpath_ast_node;
class xpath_allocator;
+ /// XPath query return type classification
+ enum xpath_type_t
+ {
+ xpath_type_none, ///< Unknown type (query failed to compile)
+ xpath_type_node_set, ///< Node set (\see xpath_node_set)
+ xpath_type_number, ///< Number
+ xpath_type_string, ///< String
+ xpath_type_boolean ///< Boolean
+ };
+
/**
* A class that holds compiled XPath query and allows to evaluate query result
*/
@@ -286,6 +296,13 @@ namespace pugi
* Dtor
*/
~xpath_query();
+
+ /**
+ * Get query expression return type
+ *
+ * \return expression return type
+ **/
+ xpath_type_t return_type() const;
/**
* Evaluate expression as boolean value for the context node \a n.
@@ -322,7 +339,7 @@ namespace pugi
/**
* Evaluate expression as node set for the context node \a n.
- * If expression does not directly evaluate to node set, function returns empty node set.
+ * 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
diff --git a/src/pugixpath.cpp b/src/pugixpath.cpp
index dabaedc..30dc3af 100644
--- a/src/pugixpath.cpp
+++ b/src/pugixpath.cpp
@@ -1214,15 +1214,6 @@ namespace pugi
ast_step_root // select root node
};
- enum ast_rettype_t
- {
- ast_type_none,
- ast_type_node_set,
- ast_type_number,
- ast_type_string,
- ast_type_boolean
- };
-
enum axis_t
{
axis_ancestor,
@@ -1265,7 +1256,7 @@ namespace pugi
private:
ast_type_t m_type;
- ast_rettype_t m_rettype;
+ xpath_type_t m_rettype;
// tree node structure
xpath_ast_node* m_left;
@@ -1289,16 +1280,16 @@ namespace pugi
{
static bool run(xpath_ast_node* lhs, xpath_ast_node* rhs, xpath_context& c)
{
- if (lhs->rettype() != ast_type_node_set && rhs->rettype() != ast_type_node_set)
+ if (lhs->rettype() != xpath_type_node_set && rhs->rettype() != xpath_type_node_set)
{
- if (lhs->rettype() == ast_type_boolean || rhs->rettype() == ast_type_boolean)
+ if (lhs->rettype() == xpath_type_boolean || rhs->rettype() == xpath_type_boolean)
return Cbool()(lhs->eval_boolean(c), rhs->eval_boolean(c));
- else if (lhs->rettype() == ast_type_number || rhs->rettype() == ast_type_number)
+ else if (lhs->rettype() == xpath_type_number || rhs->rettype() == xpath_type_number)
return Cdouble()(lhs->eval_number(c), rhs->eval_number(c));
- else if (lhs->rettype() == ast_type_string || rhs->rettype() == ast_type_string)
+ else if (lhs->rettype() == xpath_type_string || rhs->rettype() == xpath_type_string)
return Cstring()(lhs->eval_string(c), rhs->eval_string(c));
}
- else if (lhs->rettype() == ast_type_node_set && rhs->rettype() == ast_type_node_set)
+ else if (lhs->rettype() == xpath_type_node_set && rhs->rettype() == xpath_type_node_set)
{
xpath_node_set ls = lhs->eval_node_set(c);
xpath_node_set rs = rhs->eval_node_set(c);
@@ -1312,11 +1303,11 @@ namespace pugi
return false;
}
- else if (lhs->rettype() != ast_type_node_set && rhs->rettype() == ast_type_node_set)
+ else if (lhs->rettype() != xpath_type_node_set && rhs->rettype() == xpath_type_node_set)
{
- if (lhs->rettype() == ast_type_boolean)
+ if (lhs->rettype() == xpath_type_boolean)
return Cbool()(lhs->eval_boolean(c), rhs->eval_boolean(c));
- else if (lhs->rettype() == ast_type_number)
+ else if (lhs->rettype() == xpath_type_number)
{
double l = lhs->eval_number(c);
xpath_node_set rs = rhs->eval_node_set(c);
@@ -1329,7 +1320,7 @@ namespace pugi
return false;
}
- else if (lhs->rettype() == ast_type_string)
+ else if (lhs->rettype() == xpath_type_string)
{
std::string l = lhs->eval_string(c);
xpath_node_set rs = rhs->eval_node_set(c);
@@ -1343,11 +1334,11 @@ namespace pugi
return false;
}
}
- else if (lhs->rettype() == ast_type_node_set && rhs->rettype() != ast_type_node_set)
+ else if (lhs->rettype() == xpath_type_node_set && rhs->rettype() != xpath_type_node_set)
{
- if (rhs->rettype() == ast_type_boolean)
+ if (rhs->rettype() == xpath_type_boolean)
return Cbool()(lhs->eval_boolean(c), rhs->eval_boolean(c));
- else if (rhs->rettype() == ast_type_number)
+ else if (rhs->rettype() == xpath_type_number)
{
xpath_node_set ls = lhs->eval_node_set(c);
double r = rhs->eval_number(c);
@@ -1360,7 +1351,7 @@ namespace pugi
return false;
}
- else if (rhs->rettype() == ast_type_string)
+ else if (rhs->rettype() == xpath_type_string)
{
xpath_node_set ls = lhs->eval_node_set(c);
std::string r = rhs->eval_string(c);
@@ -1384,9 +1375,9 @@ namespace pugi
{
static bool run(xpath_ast_node* lhs, xpath_ast_node* rhs, xpath_context& c)
{
- if (lhs->rettype() != ast_type_node_set && rhs->rettype() != ast_type_node_set)
+ if (lhs->rettype() != xpath_type_node_set && rhs->rettype() != xpath_type_node_set)
return Cdouble()(lhs->eval_number(c), rhs->eval_number(c));
- else if (lhs->rettype() == ast_type_node_set && rhs->rettype() == ast_type_node_set)
+ else if (lhs->rettype() == xpath_type_node_set && rhs->rettype() == xpath_type_node_set)
{
xpath_node_set ls = lhs->eval_node_set(c);
xpath_node_set rs = rhs->eval_node_set(c);
@@ -1404,7 +1395,7 @@ namespace pugi
return false;
}
- else if (lhs->rettype() != ast_type_node_set && rhs->rettype() == ast_type_node_set)
+ else if (lhs->rettype() != xpath_type_node_set && rhs->rettype() == xpath_type_node_set)
{
double l = lhs->eval_number(c);
xpath_node_set rs = rhs->eval_node_set(c);
@@ -1417,7 +1408,7 @@ namespace pugi
return false;
}
- else if (lhs->rettype() == ast_type_node_set && rhs->rettype() != ast_type_node_set)
+ else if (lhs->rettype() == xpath_type_node_set && rhs->rettype() != xpath_type_node_set)
{
xpath_node_set ls = lhs->eval_node_set(c);
double r = rhs->eval_number(c);
@@ -1455,7 +1446,7 @@ namespace pugi
c.position = i + 1;
c.size = size;
- if (expr->rettype() == ast_type_number)
+ if (expr->rettype() == xpath_type_number)
{
if (expr->eval_number(c) == i + 1)
*last++ = *it;
@@ -1911,24 +1902,24 @@ namespace pugi
}
public:
xpath_ast_node(ast_type_t type, const char* contents, xpath_allocator& a): m_type(type),
- m_rettype(ast_type_none), m_left(0), m_right(0), m_third(0), m_next(0), m_contents(0)
+ m_rettype(xpath_type_none), m_left(0), m_right(0), m_third(0), m_next(0), m_contents(0)
{
set_contents(contents, a);
}
xpath_ast_node(ast_type_t type, xpath_ast_node* left, xpath_ast_node* right, axis_t axis): m_type(type),
- m_rettype(ast_type_none), m_left(left), m_right(right), m_third(0), m_next(0), m_contents(0),
+ m_rettype(xpath_type_none), m_left(left), m_right(right), m_third(0), m_next(0), m_contents(0),
m_axis(axis)
{
}
xpath_ast_node(ast_type_t type, xpath_ast_node* left = 0, xpath_ast_node* right = 0, xpath_ast_node* third = 0): m_type(type),
- m_rettype(ast_type_none), m_left(left), m_right(right), m_third(third), m_next(0), m_contents(0)
+ m_rettype(xpath_type_none), m_left(left), m_right(right), m_third(third), m_next(0), m_contents(0)
{
}
xpath_ast_node(ast_type_t type, xpath_ast_node* left, axis_t axis, nodetest_t test, const char* contents, xpath_allocator& a):
- m_type(type), m_rettype(ast_type_none), m_left(left), m_right(0), m_third(0), m_next(0),
+ m_type(type), m_rettype(xpath_type_none), m_left(left), m_right(0), m_third(0), m_next(0),
m_contents(0), m_axis(axis), m_test(test)
{
set_contents(contents, a);
@@ -2029,13 +2020,13 @@ namespace pugi
{
switch (m_rettype)
{
- case ast_type_number:
+ case xpath_type_number:
return convert_number_to_boolean(eval_number(c));
- case ast_type_string:
+ case xpath_type_string:
return !eval_string(c).empty();
- case ast_type_node_set:
+ case xpath_type_node_set:
return !eval_node_set(c).empty();
default:
@@ -2126,13 +2117,13 @@ namespace pugi
{
switch (m_rettype)
{
- case ast_type_boolean:
+ case xpath_type_boolean:
return eval_boolean(c) ? 1 : 0;
- case ast_type_string:
+ case xpath_type_string:
return convert_string_to_number(eval_string(c).c_str());
- case ast_type_node_set:
+ case xpath_type_node_set:
return convert_string_to_number(eval_string(c).c_str());
default:
@@ -2326,13 +2317,13 @@ namespace pugi
{
switch (m_rettype)
{
- case ast_type_boolean:
+ case xpath_type_boolean:
return eval_boolean(c) ? "true" : "false";
- case ast_type_number:
+ case xpath_type_number:
return convert_number_to_string(eval_number(c));
- case ast_type_node_set:
+ case xpath_type_node_set:
{
xpath_node_set ns = eval_node_set(c);
return ns.empty() ? std::string("") : string_value(ns.first());
@@ -2383,7 +2374,7 @@ namespace pugi
c.position = i + 1;
c.size = set.size();
- if (m_right->rettype() == ast_type_number)
+ if (m_right->rettype() == xpath_type_number)
{
if (m_right->eval_number(c) == i + 1)
*last++ = *it;
@@ -2625,7 +2616,7 @@ namespace pugi
case ast_op_greater_or_equal:
m_left->check_semantics();
m_right->check_semantics();
- m_rettype = ast_type_boolean;
+ m_rettype = xpath_type_boolean;
break;
case ast_op_add:
@@ -2635,65 +2626,65 @@ namespace pugi
case ast_op_mod:
m_left->check_semantics();
m_right->check_semantics();
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_op_negate:
m_left->check_semantics();
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_op_union:
m_left->check_semantics();
m_right->check_semantics();
- if (m_left->rettype() != ast_type_node_set || m_right->rettype() != ast_type_node_set)
+ if (m_left->rettype() != xpath_type_node_set || m_right->rettype() != xpath_type_node_set)
throw xpath_exception("Semantics error: union operator has to be applied to node sets");
- m_rettype = ast_type_node_set;
+ m_rettype = xpath_type_node_set;
break;
case ast_filter:
case ast_filter_posinv:
m_left->check_semantics();
m_right->check_semantics();
- if (m_left->rettype() != ast_type_node_set)
+ if (m_left->rettype() != xpath_type_node_set)
throw xpath_exception("Semantics error: predicate has to be applied to node set");
- m_rettype = ast_type_node_set;
+ m_rettype = xpath_type_node_set;
- if (!m_right->contains(ast_func_position) && m_right->rettype() != ast_type_number)
+ if (!m_right->contains(ast_func_position) && m_right->rettype() != xpath_type_number)
m_type = ast_filter_posinv;
break;
case ast_predicate:
m_left->check_semantics();
- m_rettype = ast_type_node_set;
+ m_rettype = xpath_type_node_set;
break;
case ast_variable:
throw xpath_exception("Semantics error: variable are not supported");
case ast_string_constant:
- m_rettype = ast_type_string;
+ m_rettype = xpath_type_string;
break;
case ast_number_constant:
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_func_last:
case ast_func_position:
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_func_count:
m_left->check_semantics();
- if (m_left->rettype() != ast_type_node_set)
+ if (m_left->rettype() != xpath_type_node_set)
throw xpath_exception("Semantics error: count() has to be applied to node set");
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_func_id:
m_left->check_semantics();
- m_rettype = ast_type_node_set;
+ m_rettype = xpath_type_node_set;
break;
case ast_func_local_name_0:
@@ -2705,16 +2696,16 @@ namespace pugi
if (m_left)
{
m_left->check_semantics();
- if (m_left->rettype() != ast_type_node_set)
+ if (m_left->rettype() != xpath_type_node_set)
throw xpath_exception("Semantics error: function has to be applied to node set");
}
- m_rettype = ast_type_string;
+ m_rettype = xpath_type_string;
break;
case ast_func_string_0:
case ast_func_string_1:
if (m_left) m_left->check_semantics();
- m_rettype = ast_type_string;
+ m_rettype = xpath_type_string;
break;
case ast_func_concat:
@@ -2724,7 +2715,7 @@ namespace pugi
for (xpath_ast_node* n = m_right; n; n = n->m_next)
n->check_semantics();
- m_rettype = ast_type_string;
+ m_rettype = xpath_type_string;
break;
}
@@ -2732,7 +2723,7 @@ namespace pugi
case ast_func_contains:
m_left->check_semantics();
m_right->check_semantics();
- m_rettype = ast_type_boolean;
+ m_rettype = xpath_type_boolean;
break;
case ast_func_substring_before:
@@ -2742,13 +2733,13 @@ namespace pugi
m_left->check_semantics();
m_right->check_semantics();
if (m_third) m_third->check_semantics();
- m_rettype = ast_type_string;
+ m_rettype = xpath_type_string;
break;
case ast_func_string_length_0:
case ast_func_string_length_1:
if (m_left) m_left->check_semantics();
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_func_normalize_space_0:
@@ -2757,7 +2748,7 @@ namespace pugi
if (m_left) m_left->check_semantics();
if (m_right) m_right->check_semantics();
if (m_third) m_third->check_semantics();
- m_rettype = ast_type_string;
+ m_rettype = xpath_type_string;
break;
case ast_func_boolean:
@@ -2766,27 +2757,27 @@ namespace pugi
case ast_func_false:
case ast_func_lang:
if (m_left) m_left->check_semantics();
- m_rettype = ast_type_boolean;
+ m_rettype = xpath_type_boolean;
break;
case ast_func_number_0:
case ast_func_number_1:
if (m_left) m_left->check_semantics();
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_func_sum:
m_left->check_semantics();
- if (m_left->rettype() != ast_type_node_set)
+ if (m_left->rettype() != xpath_type_node_set)
throw xpath_exception("Semantics error: sum() has to be applied to node set");
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_func_floor:
case ast_func_ceiling:
case ast_func_round:
if (m_left) m_left->check_semantics();
- m_rettype = ast_type_number;
+ m_rettype = xpath_type_number;
break;
case ast_step:
@@ -2794,19 +2785,19 @@ namespace pugi
if (m_left)
{
m_left->check_semantics();
- if (m_left->rettype() != ast_type_node_set)
+ if (m_left->rettype() != xpath_type_node_set)
throw xpath_exception("Semantics error: step has to be applied to node set");
}
for (xpath_ast_node* n = m_right; n; n = n->m_next)
n->check_semantics();
- m_rettype = ast_type_node_set;
+ m_rettype = xpath_type_node_set;
break;
}
case ast_step_root:
- m_rettype = ast_type_node_set;
+ m_rettype = xpath_type_node_set;
break;
default:
@@ -2814,7 +2805,7 @@ namespace pugi
}
}
- ast_rettype_t rettype() const
+ xpath_type_t rettype() const
{
return m_rettype;
}
@@ -3608,6 +3599,13 @@ namespace pugi
m_root->check_semantics();
}
+ xpath_type_t xpath_query::return_type() const
+ {
+ if (!m_root) return xpath_type_none;
+
+ return m_root->rettype();
+ }
+
bool xpath_query::evaluate_boolean(const xml_node& n) const
{
if (!m_root) return false;
@@ -3653,7 +3651,7 @@ 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() != ast_type_node_set) throw xpath_exception("Expression does not evaluate to node set");
+ if (m_root->rettype() != xpath_type_node_set) throw xpath_exception("Expression does not evaluate to node set");
xpath_context c;
diff --git a/tests/test_xpath_api.cpp b/tests/test_xpath_api.cpp
index cd8c7e1..665e7e9 100644
--- a/tests/test_xpath_api.cpp
+++ b/tests/test_xpath_api.cpp
@@ -143,4 +143,12 @@ TEST(xpath_api_evaluate_node_set)
}
}
+TEST(xpath_api_return_type)
+{
+ CHECK(xpath_query("node").return_type() == xpath_type_node_set);
+ CHECK(xpath_query("1").return_type() == xpath_type_number);
+ CHECK(xpath_query("'s'").return_type() == xpath_type_string);
+ CHECK(xpath_query("true()").return_type() == xpath_type_boolean);
+}
+
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 04:03:42 +0000