/* Token-reader for Bison's input parser,
- Copyright (C) 1984, 1986, 1989, 1992, 2000 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.
#include "getopt.h" /* for optarg */
#include "symtab.h"
#include "lex.h"
-#include "alloc.h"
+#include "xalloc.h"
#include "complain.h"
#include "gram.h"
-
-/* functions from main.c */
-extern char *printable_version PARAMS ((int));
+#include "quote.h"
/* Buffer for storing the current token. */
-char *token_buffer;
-
-/* Allocated size of token_buffer, not including space for terminator. */
-int maxtoken;
+struct obstack token_obstack;
+const char *token_buffer = NULL;
bucket *symval;
int numval;
void
init_lex (void)
{
- maxtoken = 100;
- token_buffer = NEW2 (maxtoken + 1, char);
+ obstack_init (&token_obstack);
unlexed = -1;
}
-char *
-grow_token_buffer (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 (void)
{
switch (c)
{
case '/':
+ /* FIXME: Should probably be merged with copy_comment. */
c = getc (finput);
if (c != '*' && c != '/')
{
}
}
-/* do a getc, but give error message if EOF encountered */
+
+/*-----------------------------------------------------.
+| Do a getc, but give error message if EOF encountered |
+`-----------------------------------------------------*/
+
static int
xgetc (FILE *f)
{
/*------------------------------------------------------------------.
| Read one literal character from finput. Process \ escapes. |
-| Append the normalized string version of the char to *PP. Assign |
+| 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 |
+| 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 (char **pp, int *pcode, char term)
+literalchar (struct obstack *out, int *pcode, char term)
{
int c;
- char *p;
+ char buf[4096];
+ char *cp;
int code;
int wasquote = 0;
}
else
{
+ char badchar [] = "c";
+ badchar[0] = c;
complain (_("unknown escape sequence: `\\' followed by `%s'"),
- printable_version (c));
+ 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. */
+ /* 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. */
- p = *pp;
+ cp = buf;
if (code == term && wasquote)
- *p++ = code;
+ *cp++ = code;
else if (code == '\\')
{
- *p++ = '\\';
- *p++ = '\\';
+ *cp++ = '\\';
+ *cp++ = '\\';
}
else if (code == '\'')
{
- *p++ = '\\';
- *p++ = '\'';
+ *cp++ = '\\';
+ *cp++ = '\'';
}
else if (code == '\"')
{
- *p++ = '\\';
- *p++ = '\"';
+ *cp++ = '\\';
+ *cp++ = '\"';
}
else if (code >= 040 && code < 0177)
- *p++ = code;
+ *cp++ = code;
else if (code == '\t')
{
- *p++ = '\\';
- *p++ = 't';
+ *cp++ = '\\';
+ *cp++ = 't';
}
else if (code == '\n')
{
- *p++ = '\\';
- *p++ = 'n';
+ *cp++ = '\\';
+ *cp++ = 'n';
}
else if (code == '\r')
{
- *p++ = '\\';
- *p++ = 'r';
+ *cp++ = '\\';
+ *cp++ = 'r';
}
else if (code == '\v')
{
- *p++ = '\\';
- *p++ = 'v';
+ *cp++ = '\\';
+ *cp++ = 'v';
}
else if (code == '\b')
{
- *p++ = '\\';
- *p++ = 'b';
+ *cp++ = '\\';
+ *cp++ = 'b';
}
else if (code == '\f')
{
- *p++ = '\\';
- *p++ = '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;
}
unlexed_symval = symval;
}
+/*-----------------------------------------------------------------.
+| We just read `<' from FIN. Store in TOKEN_BUFFER, the type name |
+| specified between the `<...>'. |
+`-----------------------------------------------------------------*/
-int
+void
+read_type_name (FILE *fin)
+{
+ 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;
- char *p;
+
+ /* Just to make sure. */
+ token_buffer = NULL;
if (unlexed >= 0)
{
}
c = skip_white_space ();
- *token_buffer = c; /* for error messages (token buffer always valid) */
- token_buffer[1] = 0;
switch (c)
{
case EOF:
- strcpy (token_buffer, "EOF");
- return ENDFILE;
+ 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 'z':
case '.': case '_':
- p = token_buffer;
while (isalnum (c) || c == '_' || c == '.')
{
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer (p);
-
- *p++ = c;
+ obstack_1grow (&token_obstack, c);
c = getc (finput);
}
-
- *p = 0;
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
ungetc (c, finput);
symval = getsym (token_buffer);
- return IDENTIFIER;
+ 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))
{
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer (p);
-
- *p++ = c;
+ obstack_1grow (&token_obstack, c);
numval = numval * 10 + c - '0';
c = getc (finput);
}
- *p = 0;
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
ungetc (c, finput);
- return NUMBER;
+ return tok_number;
}
case '\'':
translations = -1;
{
int code, discode;
- char discard[10], *dp;
- p = token_buffer;
- *p++ = '\'';
- literalchar (&p, &code, '\'');
+ obstack_1grow (&token_obstack, '\'');
+ literalchar (&token_obstack, &code, '\'');
c = getc (finput);
if (c != '\'')
{
complain (_("use \"...\" for multi-character literal tokens"));
while (1)
- {
- dp = discard;
- if (!literalchar (&dp, &discode, '\''))
- break;
- }
+ if (!literalchar (0, &discode, '\''))
+ break;
}
- *p++ = '\'';
- *p = 0;
+ obstack_1grow (&token_obstack, '\'');
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
symval = getsym (token_buffer);
- symval->class = STOKEN;
+ symval->class = token_sym;
if (!symval->user_token_number)
symval->user_token_number = code;
- return IDENTIFIER;
+ return tok_identifier;
}
case '\"':
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;
+
+ 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);
symval = getsym (token_buffer);
- symval->class = STOKEN;
+ symval->class = token_sym;
- return IDENTIFIER;
+ 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
if (c == '{')
{
- strcpy (token_buffer, "={");
- return LEFT_CURLY;
+ token_buffer = "={";
+ return tok_left_curly;
}
else
{
ungetc (c, finput);
- return ILLEGAL;
+ 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')
- {
- complain (_("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 ();
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
+ directives. A set_flag value causes the named flag to be set. A
retval action returns the code. */
struct percent_table_struct
{
const char *name;
- void *setflag;
+ void *set_flag;
int retval;
-}
-percent_table[] =
+};
+
+struct percent_table_struct percent_table[] =
{
- { "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 */
+ { "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 */
#endif
- { NULL, NULL, ILLEGAL}
+ { "header_extension", NULL, tok_hdrext},
+ { "source_extension", NULL, tok_srcext},
+ { "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, tok_illegal}
};
/* Parse a token which starts with %.
parse_percent_token (void)
{
int c;
- char *p;
struct percent_table_struct *tx;
- p = token_buffer;
c = getc (finput);
- *p++ = '%';
- *p++ = c; /* for error msg */
- *p = 0;
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;
+ return tok_illegal;
- p = token_buffer;
- *p++ = '%';
+ obstack_1grow (&token_obstack, '%');
while (isalpha (c) || c == '_' || c == '-')
{
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer (p);
-
if (c == '-')
c = '_';
- *p++ = c;
+ obstack_1grow (&token_obstack, c);
c = getc (finput);
}
ungetc (c, finput);
-
- *p = 0;
+ 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)
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;
}
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