mirror of
https://github.com/soconnor0919/eceg431.git
synced 2025-12-11 06:34:43 -05:00
98 lines
2.6 KiB
Plaintext
98 lines
2.6 KiB
Plaintext
%{
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "y.tab.h"
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extern int yylineno;
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int comment_depth = 0;
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%}
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%x COMMENT
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%x LINE_COMMENT
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%%
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"/*" { BEGIN(COMMENT); comment_depth = 1; }
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<COMMENT>"/*" { comment_depth++; }
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<COMMENT>"*/" { comment_depth--; if (comment_depth == 0) BEGIN(INITIAL); }
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<COMMENT>. { /* ignore comment content */ }
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<COMMENT>\n { yylineno++; }
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"//" { BEGIN(LINE_COMMENT); }
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<LINE_COMMENT>\n { BEGIN(INITIAL); yylineno++; }
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<LINE_COMMENT>. { /* ignore comment content */ }
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[ \t\r]+ { /* ignore whitespace */ }
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\n { yylineno++; }
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"class" { return CLASS; }
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"constructor" { return CONSTRUCTOR; }
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"function" { return FUNCTION; }
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"method" { return METHOD; }
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"field" { return FIELD; }
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"static" { return STATIC; }
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"var" { return VAR; }
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"int" { return INT; }
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"char" { return CHAR; }
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"boolean" { return BOOLEAN; }
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"void" { return VOID; }
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"true" { return TRUE; }
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"false" { return FALSE; }
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"null" { return NULL_TOKEN; }
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"this" { return THIS; }
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"let" { return LET; }
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"do" { return DO; }
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"if" { return IF; }
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"else" { return ELSE; }
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"while" { return WHILE; }
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"return" { return RETURN; }
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[a-zA-Z_][a-zA-Z0-9_]* {
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yylval.string = strdup(yytext);
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return IDENTIFIER;
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}
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[0-9]+ {
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yylval.integer = atoi(yytext);
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return INTEGER_CONSTANT;
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}
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\"([^"\\]|\\.)*\" {
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/* Remove quotes from string */
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yylval.string = strdup(yytext + 1);
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yylval.string[strlen(yylval.string) - 1] = '\0';
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return STRING_CONSTANT;
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}
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"{" { return LBRACE; }
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"}" { return RBRACE; }
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"(" { return LPAREN; }
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")" { return RPAREN; }
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"[" { return LBRACKET; }
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"]" { return RBRACKET; }
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"." { return DOT; }
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"," { return COMMA; }
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";" { return SEMICOLON; }
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"+" { return PLUS; }
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"-" { return MINUS; }
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"*" { return MULTIPLY; }
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"/" { return DIVIDE; }
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"&" { return AND; }
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"|" { return OR; }
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"<" { return LT; }
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">" { return GT; }
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"=" { return EQ; }
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"~" { return NOT; }
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. {
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fprintf(stderr, "Unexpected character: %s at line %d\n", yytext, yylineno);
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return yytext[0];
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}
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%%
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int yywrap() {
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return 1;
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}
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