137 lines
2.6 KiB
Plaintext
137 lines
2.6 KiB
Plaintext
|
// Copyright (c) 1993-1999 Microsoft Corporation
|
||
|
|
|
||
|
|
%{
|
||
|
|
/***
|
||
|
|
*** lexer for preprocessing the parser driver generated by yacc, in
|
||
|
|
*** order to convert the big switch statement into individual semantic
|
||
|
|
*** functions
|
||
|
|
***/
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <malloc.h>
|
||
|
|
#include "lex.h"
|
||
|
|
#include "gram.h"
|
||
|
|
|
||
|
|
#define VC_PRINTF( x ) /** printf(x) **/
|
||
|
|
|
||
|
|
void LexInstall_ID( void );
|
||
|
|
void LexInstall_Number( void );
|
||
|
|
int IsToken( void );
|
||
|
|
lextype_t yylval;
|
||
|
|
int Line = 0;
|
||
|
|
int Incase = 0;
|
||
|
|
int ActionSensed = 0;
|
||
|
|
char LocalBuffer[ 100 ];
|
||
|
|
|
||
|
|
%}
|
||
|
|
|
||
|
|
letter [a-z_A-Z]
|
||
|
|
digit [0-9]
|
||
|
|
letter_or_digit [a-zA-Z_0-9]
|
||
|
|
whitespace [ \t]
|
||
|
|
other .
|
||
|
|
%%
|
||
|
|
|
||
|
|
{letter}{letter_or_digit}* {
|
||
|
|
int Token;
|
||
|
|
|
||
|
|
VC_PRINTF(" Case 1\n");
|
||
|
|
|
||
|
|
if( Token = IsToken() )
|
||
|
|
{
|
||
|
|
return Token;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
LexInstall_ID();
|
||
|
|
return ID;
|
||
|
|
}
|
||
|
|
|
||
|
|
"} break;\n" {
|
||
|
|
VC_PRINTF(" Case 2\n");
|
||
|
|
Line++;
|
||
|
|
return TOKEN_END_CASE;
|
||
|
|
}
|
||
|
|
"} break;"{whitespace}*"\/\*"{whitespace}*"End of actions"{whitespace}*"\*\/\n" {
|
||
|
|
VC_PRINTF(" Case 3\n");
|
||
|
|
Line++;
|
||
|
|
return TOKEN_END_CASE;
|
||
|
|
}
|
||
|
|
{digit}{digit}* {
|
||
|
|
VC_PRINTF(" Case 4\n");
|
||
|
|
LexInstall_Number();
|
||
|
|
return NUMBER;
|
||
|
|
}
|
||
|
|
|
||
|
|
"\n" {
|
||
|
|
VC_PRINTF(" Case 5\n");
|
||
|
|
Line++;
|
||
|
|
yylval.yycharval = '\n';
|
||
|
|
return TOKEN_CHAR;
|
||
|
|
}
|
||
|
|
{other} {
|
||
|
|
VC_PRINTF(" Case 6\n");
|
||
|
|
yylval.yycharval = yytext[0];
|
||
|
|
return TOKEN_CHAR;
|
||
|
|
}
|
||
|
|
%%
|
||
|
|
/****************************************************************************
|
||
|
|
* utility routines
|
||
|
|
****************************************************************************/
|
||
|
|
/**************************************************************************
|
||
|
|
*** install parser value stack
|
||
|
|
**************************************************************************/
|
||
|
|
|
||
|
|
void
|
||
|
|
LexInstall_ID()
|
||
|
|
{
|
||
|
|
strncpy( LocalBuffer, yytext, yyleng );
|
||
|
|
LocalBuffer[ yyleng ] = '\0';
|
||
|
|
yylval.yystring = LocalBuffer;
|
||
|
|
}
|
||
|
|
void
|
||
|
|
LexInstall_Number()
|
||
|
|
{
|
||
|
|
yylval.yynumber = atoi(yytext);
|
||
|
|
}
|
||
|
|
/**************************************************************************
|
||
|
|
*** token search
|
||
|
|
**************************************************************************/
|
||
|
|
int
|
||
|
|
IsToken()
|
||
|
|
{
|
||
|
|
static char *pTokens[] =
|
||
|
|
{
|
||
|
|
"case"
|
||
|
|
,"___a_r_u_myact"
|
||
|
|
,"___a_r_u_start"
|
||
|
|
,"___a_r_u_end"
|
||
|
|
};
|
||
|
|
static int Tokens[] =
|
||
|
|
{
|
||
|
|
TOKEN_CASE
|
||
|
|
,TOKEN_MYACT
|
||
|
|
,TOKEN_START
|
||
|
|
,TOKEN_END
|
||
|
|
};
|
||
|
|
|
||
|
|
int i = 0;
|
||
|
|
int Token;
|
||
|
|
|
||
|
|
while( i < sizeof(pTokens) / sizeof(char *) )
|
||
|
|
{
|
||
|
|
if(strcmp( pTokens[i] , yytext ) == 0 )
|
||
|
|
{
|
||
|
|
Token = Tokens[i];
|
||
|
|
if(Token == TOKEN_CASE)
|
||
|
|
{
|
||
|
|
if(!ActionSensed || Incase)
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
return Token;
|
||
|
|
}
|
||
|
|
++i;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|