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编译原理2.doc

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#include"parser.h"#ifndefPARSER_DEBUG#include"semantic.h"#endif#ifdefPARSER_DEBUG#defineenter(x)printf("enterin");printf(x);printf("\n")#else#defineenter(x)#endif#ifdefPARSER_DEBUG#defineback(x)printf("exitfrom");printf(x);printf("\n")#else#defineback(x)#endif#ifdefPARSER_DEBUG#definecall_match(x)printf("matchtoken\t");printf(x);printf("\n");#else#definecall_match(x)#endif#ifdefPARSER_DEBUG#defineTree_trace(x)PrintSyntaxTree(x,1);#else#defineTree_trace#endif#ifdefPARSER_DEBUGdoubleParameter=0;//参数T的存储空间#elsedoubleParameter=0,//参数T的存储空间Origin_x=0,Origin_y=0,//横、纵平移距离Scale_x=1,Scale_y=1,//横、纵比例因子Rot_angle=0;//旋转角度#endifstaticTokentoken;//记号//---------------辅助函数声明staticvoidFetchToken();staticvoidMatchToken(enumToken_TypeAToken);staticvoidSyntaxError(intcase_of);staticvoidErrMsg(unsignedLineNo,char*descrip,char*string);staticvoidPrintSyntaxTree(structExprNode*root,intindent);//---------------非终结符的递归子程序声明staticvoidProgram();staticvoidStatement();staticvoidOriginStatement();staticvoidRotStatement();staticvoidScaleStatement();staticvoidForStatement();staticstructExprNode*Expression();staticstructExprNode*Term();staticstructExprNode*Factor();staticstructExprNode*Component();staticstructExprNode*Atom();//--------------外部接口与语法树构造函数声明externvoidParser(char*SrcFilePtr);staticstructExprNode*MakeExprNode(enumToken_Typeopcode,...);//---------------------通过词法分析器接口GetToken获取-个记号staticvoidFetchToken(){token=GetToken();if(token.type==ERRTOKEN)SyntaxError(1);}//----------------------匹配记号staticvoidMatchToken(enumToken_TypeThe_Token){if(token.type!=The_Token)SyntaxError(2);FetchToken();}//----------------------语法错误处理staticvoidSyntaxError(intcase_of){switch(case_of){case1:ErrMsg(LineNo,"错误记号",token.lexeme);break;case2:ErrMsg(LineNo,"不是预期记号",token.lexeme);break;}}//---------------------打印错误信息voidErrMsg(unsignedLineNo,char*descrip,char*string){#ifdefPARSER_DEBUGprintf("LineNo%5d:%s%s!\n",LineNo,descrip,string);#elsecharmsg[256];memset(msg,0,256);sprintf(msg,"LineNo%5d:%s%s!",LineNo,descrip,s