四川大学 C minus 语法分析器 纯代码(26 页)Good is good, but better carries it.精益求精，善益求善。#include#include#include#includeusing namespace std; #define BUFLEN 256#define MAXLEN 256#define MAXTOKENLEN 40#define MAXCHILDREN 4static int lineno;static int linepos = 0;//读取的字符在 lineBuf 的位置static int EOF_FLAG = false;static int bufsize = 0;//lineBuf 的长度static char lineBuf[BUFLEN];FILE * source;char tokenString[MAXTOKENLEN+1];string output;//输出文件 enum TokenType{ENDFILE,ERROR,IF,ELSE,INT,RETURN,VOID,WHILE,ID,NUM,ASSIGN,EQ,LT,PLUS,MINUS,TIMES,OVER,LPAREN,RPAREN,SEMI,LBRACKET,RBRACKET,LBRACE,RBRACE,COMMA,GT,GEQ,NEQ,LEQ}; enum StateType{START,INASSIGN,INCOMMENT,INNUM,INID,DONE,PRECOMMENT,AFTERCOMMENT}; struct{char* str;TokenType tok;}ReserverWords[6]= { {"if",IF},{"else",ELSE},{"int",INT},{"return",RETURN},{"void",VOID},{"while",WHILE} }; void UnGetNextChar(){if (!EOF_FLAG)linepos--;} int GetNextChar(){if(!(linepos')||(c=='=')||(c=='!')){state = INASSIGN;assign+=char(c);}else if ((c == ' ') || (c == '\t') || (c == '\n'))save = false;else if (c == '/'){save = false;state = PRECOMMENT;}else{state = DONE;switch (c){case EOF:save = false;CurrentToken = ENDFILE;break;c...
