用Boost：：spirit库写C++的源代码解析器（二） 完善的C++ enum的解析器（完全符合C++规范）

经过两天对Spirit、phoenix的熟悉终于完善了enum的解析器，他完全符合C++规范。

 

 

#include <QtCore/QCoreApplication>#include <boost/tuple/tuple.hpp>#include <boost/spirit/include/qi.hpp>#include <boost/spirit/include/phoenix.hpp>#include <iostream>#include <string>#include <list>#include <map>#define CODE_CPP_KEYWORD_ENUM "enum" namespace haha{//简单表示c++的enum的类struct CPPCodeEnum{//enum的名称::std::string enumName;//成员的名称::std::map<::std::string,int> enumMembers;};}struct InsertMap{template <typename maptype,typename keytype,typename valuetype>struct result{typedef void type;};template <typename maptype,typename keytype,typename valuetype>void operator()(maptype& mp,keytype &newkey,valuetype &newvalue) const{mp.insert(::std::pair<::std::string,int>(newkey,newvalue));}};boost::phoenix::function<InsertMap> const mInsertMap = InsertMap();namespace haha{namespace fusion = boost::fusion;namespace phoenix = boost::phoenix;namespace qi = boost::spirit::qi;namespace ascii = boost::spirit::ascii;//enum的简单解析器template <typename Iterator>struct CPPCodeEnumGrammar : qi::grammar<Iterator,CPPCodeEnum(),ascii::space_type >{CPPCodeEnumGrammar() : CPPCodeEnumGrammar::base_type(mRuleEntrence){using qi::_val;using qi::_1;using qi::_2;using qi::lit;using qi::lexeme;using qi::space;using ascii::char_;using ascii::string;//解析一个变量名（符合C++的变量命名规范，只能由数字、字母、下划线且一个字符不能是数字）mRuleCPPValueName %= lexeme[+(qi::alpha|char_('_'))>>*(qi::alpha|char_('_')|qi::digit) ];//有赋值的成员mRuleMemberValue =(mRuleCPPValueName>>qi::omit[char_("=")]>>qi::int_)[phoenix::bind(&::std::pair<::std::string,int>::first, _val)=_1,phoenix::bind(&::std::pair<::std::string,int>::second, _val)=_2,phoenix::ref(mTempValue)=_2+1];//缺省赋值的成员mRuleMemberDefaultValue = mRuleCPPValueName[phoenix::bind(&::std::pair<::std::string,int>::first, _val)=_1,phoenix::bind(&::std::pair<::std::string,int>::second, _val)=phoenix::ref(mTempValue),phoenix::ref(mTempValue)++];mRuleEntrence =//解析“enum”初始化mTempValue=0，每次调用都会使mTempValue=0lexeme[lit(CODE_CPP_KEYWORD_ENUM)[phoenix::ref(mTempValue)=0]>>+space]>>//取得enum名*mRuleCPPValueName[phoenix::bind(&CPPCodeEnum::enumName, _val)= _1]>>char_("{")>>//解析enum的成员*(((mRuleMemberValue[phoenix::insert(phoenix::bind(&CPPCodeEnum::enumMembers, _val), _1)])|mRuleMemberDefaultValue[phoenix::insert(phoenix::bind(&CPPCodeEnum::enumMembers, _val), _1)])%',')>>//可有可无的逗号小尾巴-char_(",")>>char_("}");}//成员值的计数器int mTempValue;qi::rule<Iterator,::std::pair<::std::string,int>(),ascii::space_type> mRuleMemberValue;qi::rule<Iterator,::std::pair<::std::string,int>(),ascii::space_type> mRuleMemberDefaultValue;qi::rule<Iterator, std::string(),ascii::space_type> mRuleCPPValueName;qi::rule<Iterator, CPPCodeEnum(),ascii::space_type> mRuleEntrence;};} int main(int argc, char *argv[]){QCoreApplication a(argc, argv);//模拟C++的一段代码::std::string teststr="enum _0_my_e_name_1233 {m1,m2,m3 ,m4 =5 ,m5 =90,m6}"; using boost::spirit::ascii::space;std::string::const_iterator iter = teststr.begin();std::string::const_iterator end = teststr.end();haha::CPPCodeEnumGrammar<std::string::const_iterator> myCPPCodeEnumGrammar;haha::CPPCodeEnum data; bool r = phrase_parse(iter, end, myCPPCodeEnumGrammar, space, data); return a.exec();}