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XPath: Stack construction refactoring

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git-svn-id: http://pugixml.googlecode.com/svn/trunk@725 99668b35-9821-0410-8761-19e4c4f06640
This commit is contained in:
arseny.kapoulkine 2010-09-13 20:02:04 +00:00
parent 0b60037afc
commit 0f7684b567
1 changed files with 49 additions and 42 deletions
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91
src/pugixml.cpp
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@ -4745,17 +4745,7 @@ namespace pugi
// free all allocated pages
xpath_allocator* alloc = static_cast<xpath_allocator*>(ptr);
xpath_memory_block* cur = alloc->_root;
assert(cur);
while (cur->next)
{
xpath_memory_block* next = cur->next;
global_deallocate(cur);
cur = next;
}
alloc->release();
// free allocator memory (with the first page)
global_deallocate(alloc);
@ -4835,7 +4825,7 @@ namespace pugi
return result;
}
void revert(xpath_allocator& state)
void revert(const xpath_allocator& state)
{
// free all new pages
xpath_memory_block* cur = _root;
@ -4853,6 +4843,21 @@ namespace pugi
_root = state._root;
_root_size = state._root_size;
}
void release()
{
xpath_memory_block* cur = _root;
assert(cur);
while (cur->next)
{
xpath_memory_block* next = cur->next;
global_deallocate(cur);
cur = next;
}
}
};
struct xpath_allocator_capture
@ -4875,6 +4880,28 @@ namespace pugi
xpath_allocator* result;
xpath_allocator* temp;
};
struct xpath_stack_data
{
xpath_memory_block blocks[2];
xpath_allocator result;
xpath_allocator temp;
xpath_stack stack;
xpath_stack_data(): result(blocks + 0), temp(blocks + 1)
{
blocks[0].next = blocks[1].next = 0;
stack.result = &result;
stack.temp = &temp;
}
~xpath_stack_data()
{
result.release();
temp.release();
}
};
}
// String class
@ -8973,13 +9000,9 @@ namespace pugi
if (!_root) return false;
xpath_context c(n, 1, 1);
xpath_stack_data sd;
xpath_memory_block resultblock, tempblock;
xpath_allocator result(&resultblock), temp(&tempblock);
xpath_allocator_capture cr(&result), ct(&temp);
xpath_stack stack = {&result, &temp};
return _root->eval_boolean(c, stack);
return _root->eval_boolean(c, sd.stack);
}
double xpath_query::evaluate_number(const xpath_node& n) const
@ -8987,13 +9010,9 @@ namespace pugi
if (!_root) return gen_nan();
xpath_context c(n, 1, 1);
xpath_memory_block resultblock, tempblock;
xpath_allocator result(&resultblock), temp(&tempblock);
xpath_allocator_capture cr(&result), ct(&temp);
xpath_stack stack = {&result, &temp};
xpath_stack_data sd;
return _root->eval_number(c, stack);
return _root->eval_number(c, sd.stack);
}
#ifndef PUGIXML_NO_STL
@ -9002,26 +9021,18 @@ namespace pugi
if (!_root) return string_t();
xpath_context c(n, 1, 1);
xpath_memory_block resultblock, tempblock;
xpath_allocator result(&resultblock), temp(&tempblock);
xpath_allocator_capture cr(&result), ct(&temp);
xpath_stack stack = {&result, &temp};
xpath_stack_data sd;
return _root->eval_string(c, stack).c_str();
return _root->eval_string(c, sd.stack).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_stack_data sd;
xpath_memory_block resultblock, tempblock;
xpath_allocator result(&resultblock), temp(&tempblock);
xpath_allocator_capture cr(&result), ct(&temp);
xpath_stack stack = {&result, &temp};
xpath_string r = _root ? _root->eval_string(c, stack) : xpath_string();
xpath_string r = _root ? _root->eval_string(c, sd.stack) : xpath_string();
size_t size = r.length() + 1;
@ -9046,13 +9057,9 @@ namespace pugi
}
xpath_context c(n, 1, 1);
xpath_memory_block resultblock, tempblock;
xpath_allocator result(&resultblock), temp(&tempblock);
xpath_allocator_capture cr(&result), ct(&temp);
xpath_stack stack = {&result, &temp};
xpath_stack_data sd;
xpath_node_set_raw r = _root->eval_node_set(c, stack);
xpath_node_set_raw r = _root->eval_node_set(c, sd.stack);
return xpath_node_set(r.begin(), r.end(), r.type());
}