51 lines
1.5 KiB
Plaintext
51 lines
1.5 KiB
Plaintext
/* 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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/* char can be a newline, tab, an escaped quote, or anything but a single quote, an actual line break, an actual tab, or a backslash by itself (to prevent confusion from escaped quote */
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SCHAR \\n|\\t|\\\"|[^\"\n\\]
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/*similar to above, a string Char (SCHAR) is the same as a CHAR except we cannot have double quotes instead of single quotes. Double quotes need to be escaped in Flex unlike single quotes based on documentation */
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STARTCOM \(\*
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ENDCOM \*\)
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COMMENTCHAR [^\*]|\*[^\)]
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/*Making the contents of a comment anything that is either not a * or not a * followed by ) to terminate comments at the first ENDCOM */
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%%
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/* rules */
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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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\"{SCHAR}*\" {printf( "C_STRING: %s (%d)\n", yytext, atoi( yytext ) );}
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\(\*{COMMENTCHAR}*\*\) {printf( "COMMENT: %s (%d)\n", yytext, atoi( yytext ) );}
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.|\n
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%%
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/* user code */
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int main( int argc, char **argv )
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{
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argc--, argv++; /* skip over program name */
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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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