79 lines
2.3 KiB
Plaintext
79 lines
2.3 KiB
Plaintext
/* Lexical Analysis with Flex (1.6.0) 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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int line_number = 1, column_number = 1;
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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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\n line_number++ column_number = 1;
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. column_number++;
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"integer" {return T_INTEGER}
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"address" {return T_ADDRESS}
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"Boolean" {return T_BOOLEAN}
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"character" {return T_CHARACTER}
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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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"while" {return WHILE}
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"if" {return IF}
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"then" {return THEN}
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"else" {return ELSE}
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"type" {return TYPE}
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"function" {return FUNCTION}
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"return" {return RETURN}
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"external" {return EXTERNAL}
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"as" {return AS}
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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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/* OPERATORS */
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"+" {return ADD;}
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"-" {return SUB_OR_NEG;}
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"*" {return MUL;}
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"/" {return DIV;}
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"%" {return REM;}
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"<" {return LESS_THAN;}
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"=" {return EQUAL_TO;}
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":=" {return ASSIGN;}
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"!" {return NOT;}
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"&" {return AND;}
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"|" {return OR;}
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"." {return DOT;}
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"reserve" {return RESERVE;}
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"release" {return RELEASE;}
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\"{SCHAR}*\" {printf( "C_STRING: %s (%d)\n", yytext, atoi( yytext ) );}
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{STARTCOM}{COMMENTCHAR}*{ENDCOM} {printf( "COMMENT: %s (%d)\n", yytext, atoi( yytext ) );}
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%%
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