shithub: rgbds

ref: d1ed4fbdedb5afef82e0711c0ee686a4dc83044c
dir: /src/link/lexer.l/

/*
 * Copyright (C) 2017 Antonio Nino Diaz <[email protected]>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

%option noinput
%option nounput
%option noyywrap

%{
#include <unistd.h>

#include "extern/err.h"

#include "parser.h"
%}

%%

\"([^\\\"]|\\.)*\"  {
                        if (strlen(yytext) > sizeof(yylval.s) - 1)
                            errx(1, "String is too long: \"%s\"\n.", yytext);
                        if (strlen(yytext) < 3) /* 2 quotes + 1 character */
                            errx(1, "String \"%s\" is invalid\n.", yytext);

                        yytext++; /* ignore first quote */
                        strcpy(yylval.s, yytext);
                        yylval.s[strlen(yylval.s)-1] = '\0'; /* remove end quote */

                        return STRING;
                    }

\$[a-fA-F0-9]+      {
                        yytext++; /* Skip prefix */
                        yylval.i = strtol(yytext, NULL, 16);
                        return INTEGER;
                    }
[0-9]+              {
                        yylval.i = strtol(yytext, NULL, 10);
                        return INTEGER;
                    }

(?i:ROM0)           { strcpy(yylval.s, "ROM0");  return SECTION_NONBANKED; }
(?i:ROMX)           { strcpy(yylval.s, "ROMX");  return SECTION_BANKED; }
(?i:VRAM)           { strcpy(yylval.s, "VRAM");  return SECTION_BANKED; }
(?i:WRAM0)          { strcpy(yylval.s, "WRAM0"); return SECTION_NONBANKED; }
(?i:WRAMX)          { strcpy(yylval.s, "WRAMX"); return SECTION_BANKED; }
(?i:SRAM)           { strcpy(yylval.s, "SRAM");  return SECTION_BANKED; }
(?i:OAM)            { strcpy(yylval.s, "OAM");   return SECTION_NONBANKED; }
(?i:HRAM)           { strcpy(yylval.s, "HRAM");  return SECTION_NONBANKED; }

(?i:ALIGN)          { return COMMAND_ALIGN; }
(?i:ORG)            { return COMMAND_ORG; }

"\n"                { return NEWLINE; }

;.*                 { /* Ignore comments. A dot doesn't match newline. */ }

[[:space:]]         { /* Ignore whitespace. */ }

.                   { errx(1, "Invalid character [%s]\n.", yytext); }

%%