/* Bison Grammar Scanner -*- C -*-
Copyright (C) 2002-2012 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
%option debug nodefault noinput nounput noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
/* Work around a bug in flex 2.5.31. See Debian bug 333231
<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>. */
#undef gram_wrap
#define gram_wrap() 1
#define FLEX_PREFIX(Id) gram_ ## Id
#include "flex-scanner.h"
#include "complain.h"
#include "files.h"
#include "gram.h"
#include "quotearg.h"
#include "reader.h"
#include "uniqstr.h"
#include <c-ctype.h>
#include <mbswidth.h>
#include <quote.h>
#include "scan-gram.h"
#define YY_DECL GRAM_LEX_DECL
#define YY_USER_INIT \
code_start = scanner_cursor = loc->start; \
/* Location of scanner cursor. */
static boundary scanner_cursor;
#define YY_USER_ACTION location_compute (loc, &scanner_cursor, yytext, yyleng);
static size_t no_cr_read (FILE *, char *, size_t);
#define YY_INPUT(buf, result, size) ((result) = no_cr_read (yyin, buf, size))
#define ROLLBACK_CURRENT_TOKEN \
do { \
scanner_cursor.column -= mbsnwidth (yytext, yyleng, 0); \
yyless (0); \
} while (0)
/* A string representing the most recently saved token. */
static char *last_string;
/* Bracketed identifier. */
static uniqstr bracketed_id_str = 0;
static location bracketed_id_loc;
static boundary bracketed_id_start;
static int bracketed_id_context_state = 0;
void
gram_scanner_last_string_free (void)
{
STRING_FREE;
}
static void handle_syncline (char *, location);
static unsigned long int scan_integer (char const *p, int base, location loc);
static int convert_ucn_to_byte (char const *hex_text);
static void unexpected_eof (boundary, char const *);
static void unexpected_newline (boundary, char const *);
%}
/* A C-like comment in directives/rules. */
%x SC_YACC_COMMENT
/* Strings and characters in directives/rules. */
%x SC_ESCAPED_STRING SC_ESCAPED_CHARACTER
/* A identifier was just read in directives/rules. Special state
to capture the sequence 'identifier :'. */
%x SC_AFTER_IDENTIFIER
/* Three types of user code:
- prologue (code between '%{' '%}' in the first section, before %%);
- actions, printers, union, etc, (between braced in the middle section);
- epilogue (everything after the second %%). */
%x SC_PROLOGUE SC_BRACED_CODE SC_EPILOGUE
/* C and C++ comments in code. */
%x SC_COMMENT SC_LINE_COMMENT
/* Strings and characters in code. */
%x SC_STRING SC_CHARACTER
/* Bracketed identifiers support. */
%x SC_BRACKETED_ID SC_RETURN_BRACKETED_ID
letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
notletter [^.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]{-}[%\{]
id {letter}({letter}|[-0-9])*
int [0-9]+
/* POSIX says that a tag must be both an id and a C union member, but
historically almost any character is allowed in a tag. We disallow
NUL and newline, as this simplifies our implementation. */
tag [^\0\n>]+
/* Zero or more instances of backslash-newline. Following GCC, allow
white space between the backslash and the newline. */
splice (\\[ \f\t\v]*\n)*
%%
%{
/* Nesting level of the current code in braces. */
int braces_level PACIFY_CC (= 0);
/* Parent context state, when applicable. */
int context_state PACIFY_CC (= 0);
/* Location of most recent identifier, when applicable. */
location id_loc PACIFY_CC (= empty_location);
/* Where containing code started, when applicable. Its initial
value is relevant only when yylex is invoked in the SC_EPILOGUE
start condition. */
boundary code_start = scanner_cursor;
/* Where containing comment or string or character literal started,
when applicable. */
boundary token_start PACIFY_CC (= scanner_cursor);
%}
/*-----------------------.
| Scanning white space. |
`-----------------------*/
<INITIAL,SC_AFTER_IDENTIFIER,SC_BRACKETED_ID,SC_RETURN_BRACKETED_ID>
{
/* Comments and white space. */
"," warn_at (*loc, _("stray ',' treated as white space"));
[ \f\n\t\v] |
"//".* continue;
"/*" {
token_start = loc->start;
context_state = YY_START;
BEGIN SC_YACC_COMMENT;
}
/* #line directives are not documented, and may be withdrawn or
modified in future versions of Bison. */
^"#line "{int}(" \"".*"\"")?"\n" {
handle_syncline (yytext + sizeof "#line " - 1, *loc);
}
}
/*----------------------------.
| Scanning Bison directives. |
`----------------------------*/
/* For directives that are also command line options, the regex must be
"%..."
after "[-_]"s are removed, and the directive must match the --long
option name, with a single string argument. Otherwise, add exceptions
to ../build-aux/cross-options.pl. */
<INITIAL>
{
"%binary" return PERCENT_NONASSOC;
"%code" return PERCENT_CODE;
"%debug" return PERCENT_DEBUG;
"%default"[-_]"prec" return PERCENT_DEFAULT_PREC;
"%define" return PERCENT_DEFINE;
"%defines" return PERCENT_DEFINES;
"%destructor" return PERCENT_DESTRUCTOR;
"%dprec" return PERCENT_DPREC;
"%error"[-_]"verbose" return PERCENT_ERROR_VERBOSE;
"%expect" return PERCENT_EXPECT;
"%expect"[-_]"rr" return PERCENT_EXPECT_RR;
"%file-prefix" return PERCENT_FILE_PREFIX;
"%fixed"[-_]"output"[-_]"files" return PERCENT_YACC;
"%initial-action" return PERCENT_INITIAL_ACTION;
"%glr-parser" return PERCENT_GLR_PARSER;
"%language" return PERCENT_LANGUAGE;
"%left" return PERCENT_LEFT;
"%lex-param" return PERCENT_LEX_PARAM;
"%locations" return PERCENT_LOCATIONS;
"%merge" return PERCENT_MERGE;
"%name"[-_]"prefix" return PERCENT_NAME_PREFIX;
"%no"[-_]"default"[-_]"prec" return PERCENT_NO_DEFAULT_PREC;
"%no"[-_]"lines" return PERCENT_NO_LINES;
"%nonassoc" return PERCENT_NONASSOC;
"%nondeterministic-parser" return PERCENT_NONDETERMINISTIC_PARSER;
"%nterm" return PERCENT_NTERM;
"%output" return PERCENT_OUTPUT;
"%parse-param" return PERCENT_PARSE_PARAM;
"%prec" return PERCENT_PREC;
"%printer" return PERCENT_PRINTER;
"%pure"[-_]"parser" return PERCENT_PURE_PARSER;
"%require" return PERCENT_REQUIRE;
"%right" return PERCENT_RIGHT;
"%skeleton" return PERCENT_SKELETON;
"%start" return PERCENT_START;
"%term" return PERCENT_TOKEN;
"%token" return PERCENT_TOKEN;
"%token"[-_]"table" return PERCENT_TOKEN_TABLE;
"%type" return PERCENT_TYPE;
"%union" return PERCENT_UNION;
"%verbose" return PERCENT_VERBOSE;
"%yacc" return PERCENT_YACC;
"%"{id}|"%"{notletter}([[:graph:]])+ {
complain_at (*loc, _("invalid directive: %s"), quote (yytext));
}
"=" return EQUAL;
"|" return PIPE;
";" return SEMICOLON;
"<*>" return TYPE_TAG_ANY;
"<>" return TYPE_TAG_NONE;
{id} {
val->uniqstr = uniqstr_new (yytext);
id_loc = *loc;
bracketed_id_str = NULL;
BEGIN SC_AFTER_IDENTIFIER;
}
{int} {
val->integer = scan_integer (yytext, 10, *loc);
return INT;
}
0[xX][0-9abcdefABCDEF]+ {
val->integer = scan_integer (yytext, 16, *loc);
return INT;
}
/* Identifiers may not start with a digit. Yet, don't silently
accept "1FOO" as "1 FOO". */
{int}{id} {
complain_at (*loc, _("invalid identifier: %s"), quote (yytext));
}
/* Characters. */
"'" token_start = loc->start; BEGIN SC_ESCAPED_CHARACTER;
/* Strings. */
"\"" token_start = loc->start; BEGIN SC_ESCAPED_STRING;
/* Prologue. */
"%{" code_start = loc->start; BEGIN SC_PROLOGUE;
/* Code in between braces. */
"{" {
STRING_GROW;
braces_level = 0;
code_start = loc->start;
BEGIN SC_BRACED_CODE;
}
/* A type. */
"<"{tag}">" {
obstack_grow (&obstack_for_string, yytext + 1, yyleng - 2);
STRING_FINISH;
val->uniqstr = uniqstr_new (last_string);
STRING_FREE;
return TYPE;
}
"%%" {
static int percent_percent_count;
if (++percent_percent_count == 2)
BEGIN SC_EPILOGUE;
return PERCENT_PERCENT;
}
"[" {
bracketed_id_str = NULL;
bracketed_id_start = loc->start;
bracketed_id_context_state = YY_START;
BEGIN SC_BRACKETED_ID;
}
[^\[%A-Za-z0-9_<>{}\"\'*;|=/, \f\n\t\v]+|. {
complain_at (*loc, "%s: %s",
ngettext ("invalid character", "invalid characters", yyleng),
quote_mem (yytext, yyleng));
}
<<EOF>> {
loc->start = loc->end = scanner_cursor;
yyterminate ();
}
}
/*-----------------------------------------------------------------.
| Scanning after an identifier, checking whether a colon is next. |
`-----------------------------------------------------------------*/
<SC_AFTER_IDENTIFIER>
{
"[" {
if (bracketed_id_str)
{
ROLLBACK_CURRENT_TOKEN;
BEGIN SC_RETURN_BRACKETED_ID;
*loc = id_loc;
return ID;
}
else
{
bracketed_id_start = loc->start;
bracketed_id_context_state = YY_START;
BEGIN SC_BRACKETED_ID;
}
}
":" {
BEGIN (bracketed_id_str ? SC_RETURN_BRACKETED_ID : INITIAL);
*loc = id_loc;
return ID_COLON;
}
. {
ROLLBACK_CURRENT_TOKEN;
BEGIN (bracketed_id_str ? SC_RETURN_BRACKETED_ID : INITIAL);
*loc = id_loc;
return ID;
}
<<EOF>> {
BEGIN (bracketed_id_str ? SC_RETURN_BRACKETED_ID : INITIAL);
*loc = id_loc;
return ID;
}
}
/*--------------------------------.
| Scanning bracketed identifiers. |
`--------------------------------*/
<SC_BRACKETED_ID>
{
{id} {
if (bracketed_id_str)
{
complain_at (*loc, _("unexpected identifier in bracketed name: %s"),
quote (yytext));
}
else
{
bracketed_id_str = uniqstr_new (yytext);
bracketed_id_loc = *loc;
}
}
"]" {
BEGIN bracketed_id_context_state;
if (bracketed_id_str)
{
if (INITIAL == bracketed_id_context_state)
{
val->uniqstr = bracketed_id_str;
bracketed_id_str = 0;
*loc = bracketed_id_loc;
return BRACKETED_ID;
}
}
else
complain_at (*loc, _("an identifier expected"));
}
[^\].A-Za-z0-9_/ \f\n\t\v]+|. {
complain_at (*loc, "%s: %s",
ngettext ("invalid character in bracketed name",
"invalid characters in bracketed name", yyleng),
quote_mem (yytext, yyleng));
}
<<EOF>> {
BEGIN bracketed_id_context_state;
unexpected_eof (bracketed_id_start, "]");
}
}
<SC_RETURN_BRACKETED_ID>
{
. {
ROLLBACK_CURRENT_TOKEN;
val->uniqstr = bracketed_id_str;
bracketed_id_str = 0;
*loc = bracketed_id_loc;
BEGIN INITIAL;
return BRACKETED_ID;
}
}
/*---------------------------------------------------------------.
| Scanning a Yacc comment. The initial '/ *' is already eaten. |
`---------------------------------------------------------------*/
<SC_YACC_COMMENT>
{
"*/" BEGIN context_state;
.|\n continue;
<<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
/*------------------------------------------------------------.
| Scanning a C comment. The initial '/ *' is already eaten. |
`------------------------------------------------------------*/
<SC_COMMENT>
{
"*"{splice}"/" STRING_GROW; BEGIN context_state;
<<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
/*--------------------------------------------------------------.
| Scanning a line comment. The initial '//' is already eaten. |
`--------------------------------------------------------------*/
<SC_LINE_COMMENT>
{
"\n" STRING_GROW; BEGIN context_state;
{splice} STRING_GROW;
<<EOF>> BEGIN context_state;
}
/*------------------------------------------------.
| Scanning a Bison string, including its escapes. |
| The initial quote is already eaten. |
`------------------------------------------------*/
<SC_ESCAPED_STRING>
{
"\""|"\n" {
if (yytext[0] == '\n')
unexpected_newline (token_start, "\"");
STRING_FINISH;
loc->start = token_start;
val->chars = last_string;
BEGIN INITIAL;
return STRING;
}
<<EOF>> {
unexpected_eof (token_start, "\"");
STRING_FINISH;
loc->start = token_start;
val->chars = last_string;
BEGIN INITIAL;
return STRING;
}
}
/*----------------------------------------------------------.
| Scanning a Bison character literal, decoding its escapes. |
| The initial quote is already eaten. |
`----------------------------------------------------------*/
<SC_ESCAPED_CHARACTER>
{
"'"|"\n" {
STRING_FINISH;
loc->start = token_start;
val->character = last_string[0];
{
/* FIXME: Eventually, make these errors. */
if (last_string[0] == '\0')
{
warn_at (*loc, _("empty character literal"));
/* '\0' seems dangerous even if we are about to complain. */
val->character = '\'';
}
else if (last_string[1] != '\0')
warn_at (*loc, _("extra characters in character literal"));
}
if (yytext[0] == '\n')
unexpected_newline (token_start, "'");
STRING_FREE;
BEGIN INITIAL;
return CHAR;
}
<<EOF>> {
STRING_FINISH;
loc->start = token_start;
val->character = last_string[0];
{
/* FIXME: Eventually, make these errors. */
if (last_string[0] == '\0')
{
warn_at (*loc, _("empty character literal"));
/* '\0' seems dangerous even if we are about to complain. */
val->character = '\'';
}
else if (last_string[1] != '\0')
warn_at (*loc, _("extra characters in character literal"));
}
unexpected_eof (token_start, "'");
STRING_FREE;
BEGIN INITIAL;
return CHAR;
}
}
<SC_ESCAPED_CHARACTER,SC_ESCAPED_STRING>
{
\0 complain_at (*loc, _("invalid null character"));
}
/*----------------------------.
| Decode escaped characters. |
`----------------------------*/
<SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>
{
\\[0-7]{1,3} {
unsigned long int c = strtoul (yytext + 1, NULL, 8);
if (!c || UCHAR_MAX < c)
complain_at (*loc, _("invalid number after \\-escape: %s"),
yytext+1);
else
obstack_1grow (&obstack_for_string, c);
}
\\x[0-9abcdefABCDEF]+ {
verify (UCHAR_MAX < ULONG_MAX);
unsigned long int c = strtoul (yytext + 2, NULL, 16);
if (!c || UCHAR_MAX < c)
complain_at (*loc, _("invalid number after \\-escape: %s"),
yytext+1);
else
obstack_1grow (&obstack_for_string, c);
}
\\a obstack_1grow (&obstack_for_string, '\a');
\\b obstack_1grow (&obstack_for_string, '\b');
\\f obstack_1grow (&obstack_for_string, '\f');
\\n obstack_1grow (&obstack_for_string, '\n');
\\r obstack_1grow (&obstack_for_string, '\r');
\\t obstack_1grow (&obstack_for_string, '\t');
\\v obstack_1grow (&obstack_for_string, '\v');
/* \\[\"\'?\\] would be shorter, but it confuses xgettext. */
\\("\""|"'"|"?"|"\\") obstack_1grow (&obstack_for_string, yytext[1]);
\\(u|U[0-9abcdefABCDEF]{4})[0-9abcdefABCDEF]{4} {
int c = convert_ucn_to_byte (yytext);
if (c <= 0)
complain_at (*loc, _("invalid number after \\-escape: %s"),
yytext+1);
else
obstack_1grow (&obstack_for_string, c);
}
\\(.|\n) {
char const *p = yytext + 1;
/* Quote only if escaping won't make the character visible. */
if (c_isspace ((unsigned char) *p) && c_isprint ((unsigned char) *p))
p = quote (p);
else
p = quotearg_style_mem (escape_quoting_style, p, 1);
complain_at (*loc, _("invalid character after \\-escape: %s"), p);
}
}
/*--------------------------------------------.
| Scanning user-code characters and strings. |
`--------------------------------------------*/
<SC_CHARACTER,SC_STRING>
{
{splice}|\\{splice}[^\n\[\]] STRING_GROW;
}
<SC_CHARACTER>
{
"'" STRING_GROW; BEGIN context_state;
\n unexpected_newline (token_start, "'"); BEGIN context_state;
<<EOF>> unexpected_eof (token_start, "'"); BEGIN context_state;
}
<SC_STRING>
{
"\"" STRING_GROW; BEGIN context_state;
\n unexpected_newline (token_start, "\""); BEGIN context_state;
<<EOF>> unexpected_eof (token_start, "\""); BEGIN context_state;
}
/*---------------------------------------------------.
| Strings, comments etc. can be found in user code. |
`---------------------------------------------------*/
<SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
{
"'" {
STRING_GROW;
context_state = YY_START;
token_start = loc->start;
BEGIN SC_CHARACTER;
}
"\"" {
STRING_GROW;
context_state = YY_START;
token_start = loc->start;
BEGIN SC_STRING;
}
"/"{splice}"*" {
STRING_GROW;
context_state = YY_START;
token_start = loc->start;
BEGIN SC_COMMENT;
}
"/"{splice}"/" {
STRING_GROW;
context_state = YY_START;
BEGIN SC_LINE_COMMENT;
}
}
/*-----------------------------------------------------------.
| Scanning some code in braces (actions). The initial "{" is |
| already eaten. |
`-----------------------------------------------------------*/
<SC_BRACED_CODE>
{
"{"|"<"{splice}"%" STRING_GROW; braces_level++;
"%"{splice}">" STRING_GROW; braces_level--;
"}" {
obstack_1grow (&obstack_for_string, '}');
--braces_level;
if (braces_level < 0)
{
STRING_FINISH;
loc->start = code_start;
val->code = last_string;
BEGIN INITIAL;
return BRACED_CODE;
}
}
/* Tokenize '<<%' correctly (as '<<' '%') rather than incorrrectly
(as '<' '<%'). */
"<"{splice}"<" STRING_GROW;
<<EOF>> {
unexpected_eof (code_start, "}");
STRING_FINISH;
loc->start = code_start;
val->code = last_string;
BEGIN INITIAL;
return BRACED_CODE;
}
}
/*--------------------------------------------------------------.
| Scanning some prologue: from "%{" (already scanned) to "%}". |
`--------------------------------------------------------------*/
<SC_PROLOGUE>
{
"%}" {
STRING_FINISH;
loc->start = code_start;
val->chars = last_string;
BEGIN INITIAL;
return PROLOGUE;
}
<<EOF>> {
unexpected_eof (code_start, "%}");
STRING_FINISH;
loc->start = code_start;
val->chars = last_string;
BEGIN INITIAL;
return PROLOGUE;
}
}
/*---------------------------------------------------------------.
| Scanning the epilogue (everything after the second "%%", which |
| has already been eaten). |
`---------------------------------------------------------------*/
<SC_EPILOGUE>
{
<<EOF>> {
STRING_FINISH;
loc->start = code_start;
val->chars = last_string;
BEGIN INITIAL;
return EPILOGUE;
}
}
/*-----------------------------------------------------.
| By default, grow the string obstack with the input. |
`-----------------------------------------------------*/
<SC_COMMENT,SC_LINE_COMMENT,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE,SC_STRING,SC_CHARACTER,SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>. |
<SC_COMMENT,SC_LINE_COMMENT,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>\n STRING_GROW;
%%
/* Read bytes from FP into buffer BUF of size SIZE. Return the
number of bytes read. Remove '\r' from input, treating \r\n
and isolated \r as \n. */
static size_t
no_cr_read (FILE *fp, char *buf, size_t size)
{
size_t bytes_read = fread (buf, 1, size, fp);
if (bytes_read)
{
char *w = memchr (buf, '\r', bytes_read);
if (w)
{
char const *r = ++w;
char const *lim = buf + bytes_read;
for (;;)
{
/* Found an '\r'. Treat it like '\n', but ignore any
'\n' that immediately follows. */
w[-1] = '\n';
if (r == lim)
{
int ch = getc (fp);
if (ch != '\n' && ungetc (ch, fp) != ch)
break;
}
else if (*r == '\n')
r++;
/* Copy until the next '\r'. */
do
{
if (r == lim)
return w - buf;
}
while ((*w++ = *r++) != '\r');
}
return w - buf;
}
}
return bytes_read;
}
/*------------------------------------------------------.
| Scan NUMBER for a base-BASE integer at location LOC. |
`------------------------------------------------------*/
static unsigned long int
scan_integer (char const *number, int base, location loc)
{
verify (INT_MAX < ULONG_MAX);
unsigned long int num = strtoul (number, NULL, base);
if (INT_MAX < num)
{
complain_at (loc, _("integer out of range: %s"), quote (number));
num = INT_MAX;
}
return num;
}
/*------------------------------------------------------------------.
| Convert universal character name UCN to a single-byte character, |
| and return that character. Return -1 if UCN does not correspond |
| to a single-byte character. |
`------------------------------------------------------------------*/
static int
convert_ucn_to_byte (char const *ucn)
{
verify (UCHAR_MAX <= INT_MAX);
unsigned long int code = strtoul (ucn + 2, NULL, 16);
/* FIXME: Currently we assume Unicode-compatible unibyte characters
on ASCII hosts (i.e., Latin-1 on hosts with 8-bit bytes). On
non-ASCII hosts we support only the portable C character set.
These limitations should be removed once we add support for
multibyte characters. */
if (UCHAR_MAX < code)
return -1;
#if ! ('$' == 0x24 && '@' == 0x40 && '`' == 0x60 && '~' == 0x7e)
{
/* A non-ASCII host. Use CODE to index into a table of the C
basic execution character set, which is guaranteed to exist on
all Standard C platforms. This table also includes '$', '@',
and '`', which are not in the basic execution character set but
which are unibyte characters on all the platforms that we know
about. */
static signed char const table[] =
{
'\0', -1, -1, -1, -1, -1, -1, '\a',
'\b', '\t', '\n', '\v', '\f', '\r', -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
' ', '!', '"', '#', '$', '%', '&', '\'',
'(', ')', '*', '+', ',', '-', '.', '/',
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', ':', ';', '<', '=', '>', '?',
'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', '{', '|', '}', '~'
};
code = code < sizeof table ? table[code] : -1;
}
#endif
return code;
}
/*---------------------------------------------------------------------.
| Handle '#line INT( "FILE")?\n'. ARGS has already skipped '#line '. |
`---------------------------------------------------------------------*/
static void
handle_syncline (char *args, location loc)
{
char *file;
unsigned long int lineno = strtoul (args, &file, 10);
if (INT_MAX <= lineno)
{
warn_at (loc, _("line number overflow"));
lineno = INT_MAX;
}
file = mbschr (file, '"');
if (file)
{
*mbschr (file + 1, '"') = '\0';
current_file = uniqstr_new (file + 1);
}
boundary_set (&scanner_cursor, current_file, lineno, 1);
}
/*----------------------------------------------------------------.
| For a token or comment starting at START, report message MSGID, |
| which should say that an end marker was found before |
| the expected TOKEN_END. |
`----------------------------------------------------------------*/
static void
unexpected_end (boundary start, char const *msgid, char const *token_end)
{
location loc;
loc.start = start;
loc.end = scanner_cursor;
token_end = quote (token_end);
/* Instead of '\'', display "'". */
if (!strcmp (token_end, "'\\''"))
token_end = "\"'\"";
complain_at (loc, _(msgid), token_end);
}
/*------------------------------------------------------------------------.
| Report an unexpected EOF in a token or comment starting at START. |
| An end of file was encountered and the expected TOKEN_END was missing. |
`------------------------------------------------------------------------*/
static void
unexpected_eof (boundary start, char const *token_end)
{
unexpected_end (start, N_("missing %s at end of file"), token_end);
}
/*----------------------------------------.
| Likewise, but for unexpected newlines. |
`----------------------------------------*/
static void
unexpected_newline (boundary start, char const *token_end)
{
unexpected_end (start, N_("missing %s at end of line"), token_end);
}
/*-------------------------.
| Initialize the scanner. |
`-------------------------*/
void
gram_scanner_initialize (void)
{
obstack_init (&obstack_for_string);
}
/*-----------------------------------------------.
| Free all the memory allocated to the scanner. |
`-----------------------------------------------*/
void
gram_scanner_free (void)
{
obstack_free (&obstack_for_string, 0);
/* Reclaim Flex's buffers. */
yylex_destroy ();
}