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added comment functionality for lexer, expanded tests, and updated to identify empty strings

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Partho Bhattacharya
2025-02-10 23:41:37 -05:00
parent f4a86f0de7
commit 3757434417
2 changed files with 19 additions and 5 deletions
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13
lexicalStructure.lex
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@ -7,8 +7,13 @@
DIGIT [0-9]
CHAR \\n|\\t|\\'|[^'\n\t\\]
SCHAR \\n|\\t|\\\"|[^\"\n\\]
/* 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 */
SCHAR \\n|\\t|\\\"|[^\"\n\\]
/*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 */
STARTCOM \(\*
ENDCOM \*\)
COMMENTCHAR [^\*]|\*[^\)]
/*Making the contents of a comment anything that is either not a * or not a * followed by ) to terminate comments at the first ENDCOM */
%%
/* rules */
{DIGIT}+ {printf( "C_INTEGER: %s (%d)\n", yytext, atoi( yytext ) );}
@ -21,7 +26,9 @@ SCHAR \\n|\\t|\\\"|[^\"\n\\]
"false" {printf( "C_FALSE: %s (%d)\n", yytext, atoi( yytext ) );}
\"{SCHAR}+\" {printf( "C_STRING: %s (%d)\n", yytext, atoi( yytext ) );}
\"{SCHAR}*\" {printf( "C_STRING: %s (%d)\n", yytext, atoi( yytext ) );}
{STARTCOM}{COMMENTCHAR}*{ENDCOM} {printf( "COMMENT: %s (%d)\n", yytext, atoi( yytext ) );}
.|\n