cifafenxiqi.rar.rar_flex_词法分析flex_词法分析器

//FILE:tiny.1 %{ #include "globals.h" #include"util.h" #include"scan.h' char token string[MAXLEN+1]; %} digit [0-9] number {digit}+ letter [a-zA-Z] identifier {letter|number}+ newline \n whitespace [\t]+ %% "IF" {return IF;} "then" {return THEN;} "else" {return ELSE;} "end" {return END;} "repeat" {return REPEAT;} "until" {return UNTIL;} "read" {return READ;} "write" {return WRITE;} ":=" {return ASSIGN;} "=" {return EQ;} "<" {return LT;} "+" {return PLUS;} "*" {return TIMES;} "-" {return MINUS;} ";" {return SEMI;} "(" {return LPAREN;} ")" {return RPAREN;} {number} {return NUM;} {identifier} {return ID;} {newline} {lineno++} {whitespace} {/*skip whitespace*/} "{ {char c; do {c=input(); if(c=='\n') lineno++; }while(c!='}'); } {return ERROR;} %% Token Type get Token(void) { static int firstTime=TRUE; TokenType currentToken; if(firstTime) {firstTime=FALSE; lineno++; yyin=source; yyout=listing;} currentToken=yylex(); strncpy(tlkenString,yytex,MAXLEN); if(TraceScan){ fprintf{ listing,"\t%d:",lineno); printToken(currentToken,takenString); } return currentToken;}