84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
// This file is distributed under the BSD License.
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// See LICENSE.TXT for details.
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#ifndef LANGKIT_PARSER_HPP_
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#define LANGKIT_PARSER_HPP_
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#include <boost/function.hpp>
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#include "langkit_lexer.hpp"
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typedef std::vector<TokenPtr>::iterator Token_Iterator;
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typedef boost::function<std::pair<Token_Iterator, bool>(Token_Iterator, Token_Iterator, TokenPtr, bool, int)> RuleFun;
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typedef std::tr1::shared_ptr<struct RuleImpl> RuleImplPtr;
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struct RuleImpl {
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RuleFun rule;
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bool keep;
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int new_id;
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RuleImpl() : keep(true), new_id(-1) { }
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std::pair<Token_Iterator, bool> operator()(Token_Iterator iter, Token_Iterator end, TokenPtr parent) {
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return rule(iter, end, parent, keep, new_id);
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}
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};
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std::pair<Token_Iterator, bool> String_Rule
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(Token_Iterator iter, Token_Iterator end, TokenPtr parent, bool keep, int new_id, const std::string &val);
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std::pair<Token_Iterator, bool> Type_Rule
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(Token_Iterator iter, Token_Iterator end, TokenPtr parent, bool keep, int new_id, const int val);
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std::pair<Token_Iterator, bool> Or_Rule
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(Token_Iterator iter, Token_Iterator end, TokenPtr parent, bool keep, int new_id, struct Rule lhs, struct Rule rhs);
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std::pair<Token_Iterator, bool> And_Rule
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(Token_Iterator iter, Token_Iterator end, TokenPtr parent, bool keep, int new_id, struct Rule lhs, struct Rule rhs);
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struct Rule {
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RuleImplPtr impl;
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Rule() : impl(new RuleImpl()) { }
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Rule(int id) : impl(new RuleImpl()) { impl->new_id = id; }
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Rule(RuleFun fun) : impl(new RuleImpl()) { impl->rule = fun; }
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Rule(RuleFun fun, bool keep) : impl(new RuleImpl()) { impl->rule = fun; impl->keep = keep; }
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std::pair<Token_Iterator, bool> operator()(Token_Iterator iter, Token_Iterator end, TokenPtr parent) {
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return (*impl)(iter, end, parent);
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}
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Rule &operator=(const Rule &rule) {
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//*impl = *(rule.impl);
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impl->rule = rule.impl->rule;
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impl->keep = rule.impl->keep;
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return *this;
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}
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Rule operator|(const Rule &rhs) {
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return Rule(boost::bind(Or_Rule, _1, _2, _3, _4, _5, *this, rhs));
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}
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Rule operator<<(const Rule &rhs) {
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return Rule(boost::bind(And_Rule, _1, _2, _3, _4, _5, *this, rhs));
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}
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//const RuleImplPtr get_impl() const { return impl; }
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//private:
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//RuleImplPtr impl;
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};
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Rule Str(const std::string &text, bool keep);
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Rule Id(int id, bool keep);
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Rule Str(const std::string &text);
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Rule Id(int id);
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Rule Ign(Rule rule);
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#endif /* LANGKIT_PARSER_HPP_ */
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