50 lines
2.4 KiB
Plaintext
50 lines
2.4 KiB
Plaintext
/* Lexical Analysis with Flex (2.6.0) We used some of the code from this manual */
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/* so we placed the citation here. */
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/* definitions */
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%option noyywrap
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%{
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#include "typedefs.h"
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%}
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DIGIT [0-9]
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CHAR \\\\n|\\\\t|\\\'|[^'\\\n\t]
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STRINGVAL CHAR | " "
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%%
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{DIGIT}+ {printf( "C_INTEGER: %s (%d)\n", yytext, atoi( yytext ) );}
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"null" {printf( "C_NULL: %s (%d)\n", yytext, atoi( yytext ) );}
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'{CHAR}' {printf( "C_CHARACTER: %s (%d)\n", yytext, atoi( yytext ) );} /*using double \ per documentation to show escaped chars*/
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"true" {printf( "C_TRUE: %s (%d)\n", yytext, atoi( yytext ) );}
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"false" {printf( "C_FALSE: %s (%d)\n", yytext, atoi( yytext ) );}
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"{STRINGVAL}+" {printf( "C_STRING: %s (%d)\n", yytext, atoi( yytext ) );}
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.|\n
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"integer" {printf("T_INTEGER %s, Token %d\n",yytext, T_INTEGER);} // {return T_INTEGER}
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"address" {printf("T_ADDRESS %s, Token %d\n",yytext, T_ADDRESS);} // {return T_ADDRESS}
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"Boolean" {printf("T_BOOLEAN %s, Token %d\n",yytext, T_BOOLEAN);} // {return T_BOOLEAN}
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"character" {printf("T_CHARACTER %s, Token %d\n",yytext, T_CHARACTER);} // {return T_CHARACTER}
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"string" {printf("T_STRING %s, Token %d\n",yytext, T_STRING);} // {return T_STRING}
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/* KEYWARDS */
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"while" {printf("WHILE %s, Token %d\n",yytext, WHILE);} // {return WHILE}
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"if" {printf("IF %s, Token %d\n",yytext, IF);} // {return IF}
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"then" {printf("THEN %s, Token %d\n",yytext, THEN);} // {return THEN}
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"else" {printf("ELSE %s, Token %d\n",yytext, ELSE);} // {return ELSE}
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"type" {printf("TYPE %s, Token %d\n",yytext, TYPE);} // {return TYPE}
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"function" {printf("FUNCTION %s, Token %d\n",yytext, FUNCTION);} // {return FUNCTION}
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"return" {printf("RETURN %s, Token %d\n",yytext, RETURN);} // {return RETURN}
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"external" {printf("EXTERNAL %s, Token %d\n",yytext, EXTERNAL);} // {return EXTERNAL}
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"as" {printf("AS %s, Token %d\n",yytext, AS);} // {return AS}
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%%
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int main(int argc, char *argv[]){
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argc--, argv++;
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if ( argc > 0 )
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yyin = fopen( argv[0], "r" );
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else
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yyin = stdin;
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yylex();
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}
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