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| author | kugwa <kugwa2000@gmail.com> | 2015-10-21 13:53:57 +0800 |
|---|---|---|
| committer | kugwa <kugwa2000@gmail.com> | 2015-10-21 13:53:57 +0800 |
| commit | cfc90007070c42c1b205b1d77b3ab3b61b0fba4c (patch) | |
| tree | 413bee9a060273378451519a9b0ba8faa6ff7f78 | |
| parent | 4aec326d0b910584f728e55c223738c033c43744 (diff) | |
| download | compiler2015-cfc90007070c42c1b205b1d77b3ab3b61b0fba4c.tar.gz compiler2015-cfc90007070c42c1b205b1d77b3ab3b61b0fba4c.tar.zst compiler2015-cfc90007070c42c1b205b1d77b3ab3b61b0fba4c.zip | |
Deal with identifiers and reserved words differently
| -rw-r--r-- | lexer.l | 34 |
1 files changed, 19 insertions, 15 deletions
@@ -1,8 +1,11 @@ %option noyywrap %{ #include <stdio.h> +#include <string.h> #include "symbol-table.h" +#define SIZE_OF_ARR(x) (sizeof(x)/sizeof(x[0])) + int linenumber; /* You need to define for all tokens in C--, here are some examples */ @@ -87,20 +90,25 @@ ERROR . {WS} {} {ID} { - symtab * ptr; - ptr = lookup(yytext); - if (ptr == NULL) - insertID(yytext); - else - ptr->counter++; + int i; + char *reserved[] = {"return", "typedef", "if", "else", "int", "float", "for", "void", "while"}; + + for (i = 0; i < SIZE_OF_ARR(reserved); i++) + if (strcmp(yytext, reserved[i]) == 0) break; + if (i == SIZE_OF_ARR(reserved)) { + symtab * ptr; + ptr = lookup(yytext); + if (ptr == NULL) + insertID(yytext); + else + ptr->counter++; + } } {CONST_INT} {} {CONST_FLOAT} {} {CONST_STRING} {} -{COMMENT} { - puts(yytext); - } +{COMMENT} puts(yytext); {OP_ASSIGN} {} {OP_OR} {} {OP_AND} {} @@ -116,9 +124,7 @@ ERROR . {OP_NE} {} {OP_EQ} {} -{NEWLINE} { - linenumber++; - } +{NEWLINE} linenumber++; {DL_LPAREN} {} {DL_RPAREN} {} @@ -130,9 +136,7 @@ ERROR . {DL_SEMICOL} {} {DL_DOT} {} -{ERROR} { - fputs("ERR", stderr);/* return ERROR; */ - } +{ERROR} fputs("ERR", stderr);/* return ERROR; */ %% |