/* Token-reader for Bison's input parser,
- Copyright (C) 1984, 1986, 1989, 1992 Free Software Foundation, Inc.
+ Copyright 1984, 1986, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.
-This file is part of Bison, the GNU Compiler Compiler.
+ This file is part of Bison, the GNU Compiler Compiler.
-Bison 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 2, or (at your option)
-any later version.
+ Bison 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 2, or (at your option)
+ any later version.
-Bison 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.
+ Bison 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 Bison; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with Bison; see the file COPYING. If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-
-/*
- lex is the entry point. It is called from reader.c.
- It returns one of the token-type codes defined in lex.h.
- When an identifier is seen, the code IDENTIFIER is returned
- and the name is looked up in the symbol table using symtab.c;
- symval is set to a pointer to the entry found. */
-
-#include <stdio.h>
-#include <ctype.h>
#include "system.h"
+#include "getargs.h"
#include "files.h"
#include "getopt.h" /* for optarg */
#include "symtab.h"
#include "lex.h"
-#include "new.h"
-
-/* flags set by % directives */
-extern int definesflag; /* for -d */
-extern int toknumflag; /* for -k */
-extern int noparserflag; /* for -n */
-extern int fixed_outfiles; /* for -y */
-extern int nolinesflag; /* for -l */
-extern int rawtoknumflag; /* for -r */
-extern int verboseflag; /* for -v */
-extern int debugflag; /* for -t */
-extern char *spec_name_prefix; /* for -p */
-extern char *spec_file_prefix; /* for -b */
-/*spec_outfile is declared in files.h, for -o */
-
-extern int lineno;
-extern int translations;
-
-int parse_percent_token();
-
-/* functions from main.c */
-extern char *printable_version();
-extern void fatal();
-extern void warni();
-extern void warn();
+#include "xalloc.h"
+#include "complain.h"
+#include "gram.h"
+#include "quote.h"
/* Buffer for storing the current token. */
-char *token_buffer;
-
-/* Allocated size of token_buffer, not including space for terminator. */
-static int maxtoken;
+struct obstack token_obstack;
+const char *token_buffer = NULL;
bucket *symval;
int numval;
void
-init_lex()
+init_lex (void)
{
- maxtoken = 100;
- token_buffer = NEW2 (maxtoken + 1, char);
+ obstack_init (&token_obstack);
unlexed = -1;
}
-static char *
-grow_token_buffer (p)
- char *p;
-{
- int offset = p - token_buffer;
- maxtoken *= 2;
- token_buffer = (char *) xrealloc(token_buffer, maxtoken + 1);
- return token_buffer + offset;
-}
-
-
int
-skip_white_space()
+skip_white_space (void)
{
- register int c;
- register int inside;
+ int c;
+ int inside;
- c = getc(finput);
+ c = getc (finput);
for (;;)
{
switch (c)
{
case '/':
- c = getc(finput);
+ /* FIXME: Should probably be merged with copy_comment. */
+ c = getc (finput);
if (c != '*' && c != '/')
{
- warn(_("unexpected `/' found and ignored"));
+ complain (_("unexpected `/' found and ignored"));
break;
}
cplus_comment = (c == '/');
- c = getc(finput);
+ c = getc (finput);
inside = 1;
while (inside)
if (!cplus_comment && c == '*')
{
while (c == '*')
- c = getc(finput);
+ c = getc (finput);
if (c == '/')
{
inside = 0;
- c = getc(finput);
+ c = getc (finput);
}
}
else if (c == '\n')
lineno++;
if (cplus_comment)
inside = 0;
- c = getc(finput);
+ c = getc (finput);
}
else if (c == EOF)
- fatal(_("unterminated comment"));
+ fatal (_("unterminated comment"));
else
- c = getc(finput);
+ c = getc (finput);
}
break;
case ' ':
case '\t':
case '\f':
- c = getc(finput);
+ c = getc (finput);
break;
default:
- return (c);
+ return c;
}
}
}
-/* do a getc, but give error message if EOF encountered */
-int
-safegetc(f)
- FILE *f;
+
+/*-----------------------------------------------------.
+| Do a getc, but give error message if EOF encountered |
+`-----------------------------------------------------*/
+
+static int
+xgetc (FILE *f)
{
- register int c = getc(f);
+ int c = getc (f);
if (c == EOF)
- fatal(_("Unexpected end of file"));
+ fatal (_("unexpected end of file"));
return c;
}
-/* read one literal character from finput. process \ escapes.
- append the normalized string version of the char to *pp.
- assign the character code to *pcode
- return 1 unless the character is an unescaped `term' or \n
- report error for \n
-*/
-int
-literalchar(pp, pcode, term)
- char **pp;
- int *pcode;
- char term;
+
+/*------------------------------------------------------------------.
+| Read one literal character from finput. Process \ escapes. |
+| Append the normalized string version of the char to OUT. Assign |
+| the character code to *PCODE. Return 1 unless the character is an |
+| unescaped `term' or \n report error for \n. |
+`------------------------------------------------------------------*/
+
+/* FIXME: We could directly work in the obstack, but that would make
+ it more difficult to move to quotearg some day. So for the time
+ being, I prefer have literalchar behave like quotearg, and change
+ my mind later if I was wrong. */
+
+static int
+literalchar (struct obstack *out, int *pcode, char term)
{
- register int c;
- register char *p;
- register int code;
+ int c;
+ char buf[4096];
+ char *cp;
+ int code;
int wasquote = 0;
- c = safegetc(finput);
+ c = xgetc (finput);
if (c == '\n')
{
- warn(_("unescaped newline in constant"));
- ungetc(c, finput);
+ complain (_("unescaped newline in constant"));
+ ungetc (c, finput);
code = '?';
wasquote = 1;
}
}
else
{
- c = safegetc(finput);
- if (c == 't') code = '\t';
- else if (c == 'n') code = '\n';
- else if (c == 'a') code = '\007';
- else if (c == 'r') code = '\r';
- else if (c == 'f') code = '\f';
- else if (c == 'b') code = '\b';
- else if (c == 'v') code = 013;
- else if (c == '\\') code = '\\';
- else if (c == '\'') code = '\'';
- else if (c == '\"') code = '\"';
+ c = xgetc (finput);
+ if (c == 't')
+ code = '\t';
+ else if (c == 'n')
+ code = '\n';
+ else if (c == 'a')
+ code = '\007';
+ else if (c == 'r')
+ code = '\r';
+ else if (c == 'f')
+ code = '\f';
+ else if (c == 'b')
+ code = '\b';
+ else if (c == 'v')
+ code = '\013';
+ else if (c == '\\')
+ code = '\\';
+ else if (c == '\'')
+ code = '\'';
+ else if (c == '\"')
+ code = '\"';
else if (c <= '7' && c >= '0')
{
code = 0;
code = (code * 8) + (c - '0');
if (code >= 256 || code < 0)
{
- warni(_("octal value outside range 0...255: `\\%o'"), code);
+ complain (_("octal value outside range 0...255: `\\%o'"),
+ code);
code &= 0xFF;
break;
}
- c = safegetc(finput);
+ c = xgetc (finput);
}
- ungetc(c, finput);
+ ungetc (c, finput);
}
else if (c == 'x')
{
- c = safegetc(finput);
+ c = xgetc (finput);
code = 0;
while (1)
{
if (c >= '0' && c <= '9')
- code *= 16, code += c - '0';
+ code *= 16, code += c - '0';
else if (c >= 'a' && c <= 'f')
- code *= 16, code += c - 'a' + 10;
+ code *= 16, code += c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
- code *= 16, code += c - 'A' + 10;
+ code *= 16, code += c - 'A' + 10;
else
break;
- if (code >= 256 || code<0)
+ if (code >= 256 || code < 0)
{
- warni(_("hexadecimal value above 255: `\\x%x'"), code);
+ complain (_("hexadecimal value above 255: `\\x%x'"), code);
code &= 0xFF;
break;
}
- c = safegetc(finput);
+ c = xgetc (finput);
}
- ungetc(c, finput);
+ ungetc (c, finput);
}
else
{
- warni (_("unknown escape sequence: `\\' followed by `%s'"),
- printable_version(c));
+ char badchar [] = "c";
+ badchar[0] = c;
+ complain (_("unknown escape sequence: `\\' followed by `%s'"),
+ quote (badchar));
code = '?';
}
- } /* has \ */
-
- /* now fill token_buffer with the canonical name for this character
- as a literal token. Do not use what the user typed,
- so that `\012' and `\n' can be interchangeable. */
-
- p = *pp;
- if (code >= 040 && code < 0177)
- *p++ = code;
- else if (code == '\\') {*p++ = '\\'; *p++ = '\\';}
- else if (code == '\'') {*p++ = '\\'; *p++ = '\'';}
- else if (code == '\"') {*p++ = '\\'; *p++ = '\"';}
- else if (code == '\t') {*p++ = '\\'; *p++ = 't';}
- else if (code == '\n') {*p++ = '\\'; *p++ = 'n';}
- else if (code == '\r') {*p++ = '\\'; *p++ = 'r';}
- else if (code == '\v') {*p++ = '\\'; *p++ = 'v';}
- else if (code == '\b') {*p++ = '\\'; *p++ = 'b';}
- else if (code == '\f') {*p++ = '\\'; *p++ = 'f';}
+ } /* has \ */
+
+ /* now fill BUF with the canonical name for this character as a
+ literal token. Do not use what the user typed, so that `\012'
+ and `\n' can be interchangeable. */
+
+ cp = buf;
+ if (code == term && wasquote)
+ *cp++ = code;
+ else if (code == '\\')
+ {
+ *cp++ = '\\';
+ *cp++ = '\\';
+ }
+ else if (code == '\'')
+ {
+ *cp++ = '\\';
+ *cp++ = '\'';
+ }
+ else if (code == '\"')
+ {
+ *cp++ = '\\';
+ *cp++ = '\"';
+ }
+ else if (code >= 040 && code < 0177)
+ *cp++ = code;
+ else if (code == '\t')
+ {
+ *cp++ = '\\';
+ *cp++ = 't';
+ }
+ else if (code == '\n')
+ {
+ *cp++ = '\\';
+ *cp++ = 'n';
+ }
+ else if (code == '\r')
+ {
+ *cp++ = '\\';
+ *cp++ = 'r';
+ }
+ else if (code == '\v')
+ {
+ *cp++ = '\\';
+ *cp++ = 'v';
+ }
+ else if (code == '\b')
+ {
+ *cp++ = '\\';
+ *cp++ = 'b';
+ }
+ else if (code == '\f')
+ {
+ *cp++ = '\\';
+ *cp++ = 'f';
+ }
else
{
- *p++ = '\\';
- *p++ = code / 0100 + '0';
- *p++ = ((code / 010) & 07) + '0';
- *p++ = (code & 07) + '0';
+ *cp++ = '\\';
+ *cp++ = code / 0100 + '0';
+ *cp++ = ((code / 010) & 07) + '0';
+ *cp++ = (code & 07) + '0';
}
- *pp = p;
+ *cp = '\0';
+
+ if (out)
+ obstack_sgrow (out, buf);
*pcode = code;
- return ! wasquote;
+ return !wasquote;
}
void
-unlex(token)
- int token;
+unlex (int token)
{
unlexed = token;
unlexed_symval = symval;
}
+/*-----------------------------------------------------------------.
+| We just read `<' from FIN. Store in TOKEN_BUFFER, the type name |
+| specified between the `<...>'. |
+`-----------------------------------------------------------------*/
-int
-lex()
+void
+read_type_name (FILE *fin)
{
- register int c;
- char *p;
+ int c = getc (fin);
+
+ while (c != '>')
+ {
+ if (c == EOF)
+ fatal (_("unterminated type name at end of file"));
+ if (c == '\n')
+ {
+ complain (_("unterminated type name"));
+ ungetc (c, fin);
+ break;
+ }
+
+ obstack_1grow (&token_obstack, c);
+ c = getc (fin);
+ }
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
+}
+
+
+token_t
+lex (void)
+{
+ int c;
+
+ /* Just to make sure. */
+ token_buffer = NULL;
if (unlexed >= 0)
{
symval = unlexed_symval;
c = unlexed;
unlexed = -1;
- return (c);
+ return c;
}
- c = skip_white_space();
- *token_buffer = c; /* for error messages (token buffer always valid) */
- token_buffer[1] = 0;
+ c = skip_white_space ();
switch (c)
{
case EOF:
- strcpy(token_buffer, "EOF");
- return (ENDFILE);
-
- case 'A': case 'B': case 'C': case 'D': case 'E':
- case 'F': case 'G': case 'H': case 'I': case 'J':
- case 'K': case 'L': case 'M': case 'N': case 'O':
- case 'P': case 'Q': case 'R': case 'S': case 'T':
- case 'U': case 'V': case 'W': case 'X': case 'Y':
+ token_buffer = "EOF";
+ return tok_eof;
+
+ case 'A': case 'B': case 'C': case 'D': case 'E':
+ case 'F': case 'G': case 'H': case 'I': case 'J':
+ case 'K': case 'L': case 'M': case 'N': case 'O':
+ case 'P': case 'Q': case 'R': case 'S': case 'T':
+ case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z':
- case 'a': case 'b': case 'c': case 'd': case 'e':
- case 'f': case 'g': case 'h': case 'i': case 'j':
- case 'k': case 'l': case 'm': case 'n': case 'o':
- case 'p': case 'q': case 'r': case 's': case 't':
- case 'u': case 'v': case 'w': case 'x': case 'y':
+ case 'a': case 'b': case 'c': case 'd': case 'e':
+ case 'f': case 'g': case 'h': case 'i': case 'j':
+ case 'k': case 'l': case 'm': case 'n': case 'o':
+ case 'p': case 'q': case 'r': case 's': case 't':
+ case 'u': case 'v': case 'w': case 'x': case 'y':
case 'z':
- case '.': case '_':
- p = token_buffer;
- while (isalnum(c) || c == '_' || c == '.')
- {
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer(p);
+ case '.': case '_':
- *p++ = c;
- c = getc(finput);
+ while (isalnum (c) || c == '_' || c == '.')
+ {
+ obstack_1grow (&token_obstack, c);
+ c = getc (finput);
}
-
- *p = 0;
- ungetc(c, finput);
- symval = getsym(token_buffer);
- return (IDENTIFIER);
-
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
+ ungetc (c, finput);
+ symval = getsym (token_buffer);
+ return tok_identifier;
+
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
{
numval = 0;
- p = token_buffer;
- while (isdigit(c))
+ while (isdigit (c))
{
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer(p);
-
- *p++ = c;
- numval = numval*10 + c - '0';
- c = getc(finput);
+ obstack_1grow (&token_obstack, c);
+ numval = numval * 10 + c - '0';
+ c = getc (finput);
}
- *p = 0;
- ungetc(c, finput);
- return (NUMBER);
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
+ ungetc (c, finput);
+ return tok_number;
}
case '\'':
-
/* parse the literal token and compute character code in code */
translations = -1;
{
int code, discode;
- char discard[10], *dp;
- p = token_buffer;
- *p++ = '\'';
- literalchar(&p, &code, '\'');
- c = getc(finput);
+ obstack_1grow (&token_obstack, '\'');
+ literalchar (&token_obstack, &code, '\'');
+
+ c = getc (finput);
if (c != '\'')
{
- warn(_("use \"...\" for multi-character literal tokens"));
- dp = discard;
- while (literalchar(&dp, &discode, '\'')) {}
+ complain (_("use \"...\" for multi-character literal tokens"));
+ while (1)
+ if (!literalchar (0, &discode, '\''))
+ break;
}
- *p++ = '\'';
- *p = 0;
- symval = getsym(token_buffer);
- symval->class = STOKEN;
- if (! symval->user_token_number)
+ obstack_1grow (&token_obstack, '\'');
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
+ symval = getsym (token_buffer);
+ symval->class = token_sym;
+ if (!symval->user_token_number)
symval->user_token_number = code;
- return (IDENTIFIER);
+ return tok_identifier;
}
case '\"':
-
/* parse the literal string token and treat as an identifier */
translations = -1;
{
- int code; /* ignored here */
- p = token_buffer;
- *p++ = '\"';
- while (literalchar(&p, &code, '\"')) /* read up to and including " */
- {
- if (p >= token_buffer + maxtoken - 4)
- p = grow_token_buffer(p);
- }
- *p = 0;
+ int code; /* ignored here */
- symval = getsym(token_buffer);
- symval->class = STOKEN;
+ obstack_1grow (&token_obstack, '\"');
+ /* Read up to and including ". */
+ while (literalchar (&token_obstack, &code, '\"'))
+ /* nothing */;
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
- return (IDENTIFIER);
+ symval = getsym (token_buffer);
+ symval->class = token_sym;
+
+ return tok_identifier;
}
case ',':
- return (COMMA);
+ return tok_comma;
case ':':
- return (COLON);
+ return tok_colon;
case ';':
- return (SEMICOLON);
+ return tok_semicolon;
case '|':
- return (BAR);
+ return tok_bar;
case '{':
- return (LEFT_CURLY);
+ return tok_left_curly;
case '=':
do
{
- c = getc(finput);
- if (c == '\n') lineno++;
+ c = getc (finput);
+ if (c == '\n')
+ lineno++;
}
- while(c==' ' || c=='\n' || c=='\t');
+ while (c == ' ' || c == '\n' || c == '\t');
if (c == '{')
{
- strcpy(token_buffer, "={");
- return(LEFT_CURLY);
+ token_buffer = "={";
+ return tok_left_curly;
}
else
{
- ungetc(c, finput);
- return(ILLEGAL);
+ ungetc (c, finput);
+ return tok_illegal;
}
case '<':
- p = token_buffer;
- c = getc(finput);
- while (c != '>')
- {
- if (c == EOF)
- fatal(_("unterminated type name at end of file"));
- if (c == '\n')
- {
- warn(_("unterminated type name"));
- ungetc(c, finput);
- break;
- }
-
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer(p);
-
- *p++ = c;
- c = getc(finput);
- }
- *p = 0;
- return (TYPENAME);
-
+ read_type_name (finput);
+ return tok_typename;
case '%':
- return (parse_percent_token());
+ return parse_percent_token ();
default:
- return (ILLEGAL);
+ return tok_illegal;
}
}
-/* the following table dictates the action taken for the various
- % directives. A setflag value causes the named flag to be
- set. A retval action returns the code.
-*/
-struct percent_table_struct {
- char *name;
- void *setflag;
- int retval;
-} percent_table[] =
+/* the following table dictates the action taken for the various %
+ directives. A set_flag value causes the named flag to be set. A
+ retval action returns the code. */
+struct percent_table_struct
{
- {"token", NULL, TOKEN},
- {"term", NULL, TOKEN},
- {"nterm", NULL, NTERM},
- {"type", NULL, TYPE},
- {"guard", NULL, GUARD},
- {"union", NULL, UNION},
- {"expect", NULL, EXPECT},
- {"thong", NULL, THONG},
- {"start", NULL, START},
- {"left", NULL, LEFT},
- {"right", NULL, RIGHT},
- {"nonassoc", NULL, NONASSOC},
- {"binary", NULL, NONASSOC},
- {"semantic_parser", NULL, SEMANTIC_PARSER},
- {"pure_parser", NULL, PURE_PARSER},
- {"prec", NULL, PREC},
-
- {"no_lines", &nolinesflag, NOOP}, /* -l */
- {"raw", &rawtoknumflag, NOOP}, /* -r */
- {"token_table", &toknumflag, NOOP}, /* -k */
+ const char *name;
+ void *set_flag;
+ int retval;
+};
+struct percent_table_struct percent_table[] =
+{
+ { "token", NULL, tok_token },
+ { "term", NULL, tok_token },
+ { "nterm", NULL, tok_nterm },
+ { "type", NULL, tok_type },
+ { "guard", NULL, tok_guard },
+ { "union", NULL, tok_union },
+ { "expect", NULL, tok_expect },
+ { "thong", NULL, tok_thong },
+ { "start", NULL, tok_start },
+ { "left", NULL, tok_left },
+ { "right", NULL, tok_right },
+ { "nonassoc", NULL, tok_nonassoc },
+ { "binary", NULL, tok_nonassoc },
+ { "prec", NULL, tok_prec },
+ { "locations", &locations_flag, tok_noop }, /* -l */
+ { "no_lines", &no_lines_flag, tok_noop }, /* -l */
+ { "raw", NULL, tok_obsolete }, /* -r */
+ { "token_table", &token_table_flag, tok_noop }, /* -k */
+ { "yacc", &yacc_flag, tok_noop }, /* -y */
+ { "fixed_output_files",&yacc_flag, tok_noop }, /* -y */
+ { "defines", &defines_flag, tok_noop }, /* -d */
+ { "no_parser", &no_parser_flag, tok_noop }, /* -n */
#if 0
- /* These can be utilized after main is reoganized so
- open_files() is deferred 'til after read_declarations().
- But %{ and %union both put information into files
- that have to be opened before read_declarations().
- */
- {"yacc", &fixed_outfiles, NOOP}, /* -y */
- {"fixed_output_files", &fixed_outfiles, NOOP}, /* -y */
- {"defines", &definesflag, NOOP}, /* -d */
- {"no_parser", &noparserflag, NOOP}, /* -n */
- {"output_file", &spec_outfile, SETOPT}, /* -o */
- {"file_prefix", &spec_file_prefix, SETOPT}, /* -b */
- {"name_prefix", &spec_name_prefix, SETOPT}, /* -p */
-
- /* These would be acceptable, but they do not affect processing */
- {"verbose", &verboseflag, NOOP}, /* -v */
- {"debug", &debugflag, NOOP}, /* -t */
- /* {"help", <print usage stmt>, NOOP}, /* -h */
- /* {"version", <print version number> , NOOP}, /* -V */
+ /* For the time being, this is not enabled yet, while it's possible
+ though, since we use obstacks. The only risk is with semantic
+ parsers which will output an `include' of an output file: be sure
+ that the naem included is indeed the name of the output file. */
+ { "output_file", &spec_outfile, tok_setopt }, /* -o */
+ { "file_prefix", &spec_file_prefix, tok_setopt }, /* -b */
+ { "name_prefix", &spec_name_prefix, tok_setopt }, /* -p */
+ { "header_extension", NULL, tok_hdrext},
+ { "source_extension", NULL, tok_srcext},
#endif
+ { "verbose", &verbose_flag, tok_noop }, /* -v */
+ { "debug", &debug_flag, tok_noop }, /* -t */
+ { "semantic_parser", &semantic_parser, tok_noop },
+ { "pure_parser", &pure_parser, tok_noop },
- {NULL, NULL, ILLEGAL}
+ { NULL, NULL, tok_illegal}
};
/* Parse a token which starts with %.
Assumes the % has already been read and discarded. */
int
-parse_percent_token ()
+parse_percent_token (void)
{
- register int c;
- register char *p;
- register struct percent_table_struct *tx;
+ int c;
+ struct percent_table_struct *tx;
- p = token_buffer;
- c = getc(finput);
- *p++ = '%';
- *p++ = c; /* for error msg */
- *p = 0;
+ c = getc (finput);
switch (c)
{
case '%':
- return (TWO_PERCENTS);
+ return tok_two_percents;
case '{':
- return (PERCENT_LEFT_CURLY);
+ return tok_percent_left_curly;
case '<':
- return (LEFT);
+ return tok_left;
case '>':
- return (RIGHT);
+ return tok_right;
case '2':
- return (NONASSOC);
+ return tok_nonassoc;
case '0':
- return (TOKEN);
+ return tok_token;
case '=':
- return (PREC);
+ return tok_prec;
}
- if (!isalpha(c))
- return (ILLEGAL);
- p = token_buffer;
- *p++ = '%';
- while (isalpha(c) || c == '_' || c == '-')
- {
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer(p);
+ if (!isalpha (c))
+ return tok_illegal;
- if (c == '-') c = '_';
- *p++ = c;
- c = getc(finput);
+ obstack_1grow (&token_obstack, '%');
+ while (isalpha (c) || c == '_' || c == '-')
+ {
+ if (c == '-')
+ c = '_';
+ obstack_1grow (&token_obstack, c);
+ c = getc (finput);
}
- ungetc(c, finput);
-
- *p = 0;
+ ungetc (c, finput);
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
/* table lookup % directive */
for (tx = percent_table; tx->name; tx++)
- if (strcmp(token_buffer+1, tx->name) == 0)
+ if (strcmp (token_buffer + 1, tx->name) == 0)
break;
- if (tx->retval == SETOPT)
+
+ if (tx->set_flag)
{
- *((char **)(tx->setflag)) = optarg;
- return NOOP;
+ *((int *) (tx->set_flag)) = 1;
+ return tok_noop;
}
- if (tx->setflag)
+
+ switch (tx->retval)
{
- *((int *)(tx->setflag)) = 1;
- return NOOP;
+ case tok_setopt:
+ *((char **) (tx->set_flag)) = optarg;
+ return tok_noop;
+ break;
+
+ case tok_obsolete:
+ fatal (_("`%s' is no longer supported"), token_buffer);
+ break;
}
+
return tx->retval;
}
projects / bison.git / blobdiff