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Diffstat (limited to 'src/meta1-lex.l')
| -rw-r--r-- | src/meta1-lex.l | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/meta1-lex.l b/src/meta1-lex.l new file mode 100644 index 0000000..cb2931d --- /dev/null +++ b/src/meta1-lex.l @@ -0,0 +1,114 @@ +/* MeTA1 configuration lexer for Grecs. -*- c -*- */ +%top { +/* MeTA1 configuration lexer for Grecs. + Copyright (C) 2007-2011 Sergey Poznyakoff + + Grecs is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 3 of the License, or (at your + option) any later version. + + Grecs is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with Grecs. If not, see <http://www.gnu.org/licenses/>. */ + +/* This file implements a lexical analyzer for MeTA1 main configuration file. + */ + +#ifndef HAVE_CONFIG_H +# include <config.h> +#endif +#include "grecs.h" +#include "meta1-gram.h" +#include <ctype.h> +} + +%{ +static int yywrap(void); +static void meta1_line_add_unescape_hex(const char *text, size_t len); +%} + +%x COMMENT STR +X [0-9a-fA-F] +%% + /* C-style comments */ +"/*" BEGIN (COMMENT); +<COMMENT>[^*\n]* /* eat anything that's not a '*' */ +<COMMENT>"*"+[^*/\n]* /* eat up '*'s not followed by '/'s */ +<COMMENT>\n ++grecs_current_locus.line; +<COMMENT>"*"+"/" BEGIN (INITIAL); + /* End-of-line comments */ +#.*\n { grecs_current_locus.line++; } +#.* /* end-of-file comment */; + /* Number */ +0[xX]{X}+ | +0[0-7]+ | +[1-9][0-9]+ { grecs_line_begin(); + grecs_line_add(yytext, yyleng); + yylval.string = grecs_line_finish(); + return META1_STRING; } + /* Identifiers (unquoted strings) */ +[a-zA-Z0-9_\./:\*-]+ { grecs_line_begin(); + grecs_line_add(yytext, yyleng); + yylval.ident.locus = grecs_current_locus; + yylval.ident.string = grecs_line_finish(); + return META1_IDENT; } + /* Quoted strings */ +\"[^\\"\n]*\" { grecs_line_begin(); + grecs_line_add(yytext + 1, yyleng - 2); + yylval.string = grecs_line_finish(); + return META1_STRING; } +\"[^\\"\n]*\\x{X}{1,2} { BEGIN(STR); + grecs_line_begin(); + meta1_line_add_unescape_hex(yytext + 1, yyleng - 1); + } +\"[^\\"\n]*\\. { BEGIN(STR); + grecs_line_begin(); + grecs_line_acc_grow_unescape_last(yytext + 1, + yyleng - 1); } +<STR>[^\\"\n]*\\x{X}{1,2} { meta1_line_add_unescape_hex(yytext, yyleng); } +<STR>[^\\"\n]*\\. { grecs_line_acc_grow_unescape_last(yytext, yyleng); } +<STR>[^\\"\n]*\" { BEGIN(INITIAL); + if (yyleng > 1) + grecs_line_add(yytext, yyleng - 1); + yylval.string = grecs_line_finish(); + return META1_STRING; } +<STR>[^\\"\n]*\n { BEGIN(INITIAL); + grecs_error(&grecs_current_locus, 0, + _("newline in a string")); + grecs_line_add (yytext, yyleng - 1); + yylval.string = grecs_line_finish (); + return META1_STRING; } + /* Other tokens */ +[ \t\f][ \t\f]* ; +\n { grecs_current_locus.line++; } +[,;{}=] return yytext[0]; +. { grecs_error(&grecs_current_locus, 0, + (isascii(yytext[0]) && isprint(yytext[0])) ? + _("stray character %c") : + _("stray character \\%03o"), + (unsigned char) yytext[0]); } +%% + +int +yywrap() +{ + return 1; +} + +static void +meta1_line_add_unescape_hex(const char *text, size_t len) +{ + for (; text[len-1] != 'x' && len > 0; len--) + ; + grecs_line_acc_grow(text, len - 2); + grecs_line_acc_grow_char((char) strtoul (text + len, NULL, 16)); +} + + + + |