97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
// This file is distributed under the BSD License.
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// See LICENSE.TXT for details.
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#include <boost/bind.hpp>
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#include <iostream>
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#include <utility>
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#include "langkit_lexer.hpp"
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#include "langkit_parser.hpp"
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std::pair<Token_Iterator, bool> String_Rule(Token_Iterator iter, Token_Iterator end, TokenPtr parent, const std::string &val, bool keep) {
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if (*iter != *end) {
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if ((*iter)->text == val) {
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if (keep) {
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parent->children.push_back(*iter);
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}
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return std::pair<Token_Iterator, bool>(++iter, true);
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}
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}
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return std::pair<Token_Iterator, bool>(iter, false);
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}
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std::pair<Token_Iterator, bool> Type_Rule(Token_Iterator iter, Token_Iterator end, TokenPtr parent, const int val, bool keep) {
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if (*iter != *end) {
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if ((*iter)->identifier == val) {
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if (keep) {
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parent->children.push_back(*iter);
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}
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return std::pair<Token_Iterator, bool>(++iter, true);
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}
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}
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return std::pair<Token_Iterator, bool>(iter, false);
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}
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std::pair<Token_Iterator, bool> Or_Rule(Token_Iterator iter, Token_Iterator end, TokenPtr parent, Rule lhs, Rule rhs) {
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Token_Iterator new_iter;
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unsigned int prev_size = parent->children.size();
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if (*iter != *end) {
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std::pair<Token_Iterator, bool> result = lhs(iter, end, parent);
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if (result.second) {
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return std::pair<Token_Iterator, bool>(result.first, true);
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}
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else {
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result = rhs(iter, end, parent);
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if (result.second) {
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return std::pair<Token_Iterator, bool>(result.first, true);
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}
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}
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}
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if (parent->children.size() != prev_size) {
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//Clear out the partial matches
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parent->children.erase(parent->children.begin() + prev_size, parent->children.end());
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}
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return std::pair<Token_Iterator, bool>(iter, false);
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}
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std::pair<Token_Iterator, bool> And_Rule(Token_Iterator iter, Token_Iterator end, TokenPtr parent, Rule lhs, Rule rhs) {
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Token_Iterator lhs_iter, rhs_iter;
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unsigned int prev_size = parent->children.size();
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if (*iter != *end) {
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std::pair<Token_Iterator, bool> result = lhs(iter, end, parent);
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if (result.second) {
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result = rhs(result.first, end, parent);
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if (result.second) {
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return std::pair<Token_Iterator, bool>(result.first, true);
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}
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}
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}
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if (parent->children.size() != prev_size) {
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//Clear out the partial matches
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parent->children.erase(parent->children.begin() + prev_size, parent->children.end());
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}
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return std::pair<Token_Iterator, bool>(iter, false);
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}
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std::pair<Token_Iterator, bool> Rule::operator()(Token_Iterator iter, Token_Iterator end, TokenPtr parent) {
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return impl->rule(iter, end, parent);
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}
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Rule Str(const std::string &text, bool keep) {
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return Rule(boost::bind(String_Rule, _1, _2, _3, text, keep));
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}
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Rule Id(int id, bool keep) {
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return Rule(boost::bind(Type_Rule, _1, _2, _3, id, keep));
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}
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