/* Bison Grammar Scanner -*- C -*-
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA
*/
-%option debug nodefault noyywrap never-interactive
+%option debug nodefault nounput noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
-#include "system.h"
+/* 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
-#include <mbswidth.h>
-#include <get-errno.h>
-#include <quote.h>
+#define FLEX_PREFIX(Id) gram_ ## Id
+#include "flex-scanner.h"
#include "complain.h"
#include "files.h"
-#include "getargs.h"
#include "gram.h"
+#include "quotearg.h"
#include "reader.h"
#include "uniqstr.h"
+#include <mbswidth.h>
+#include <quote.h>
+
+#include "scan-gram.h"
+
+#define YY_DECL GRAM_LEX_DECL
+
#define YY_USER_INIT \
- do \
- { \
- scanner_cursor.file = current_file; \
- scanner_cursor.line = 1; \
- scanner_cursor.column = 1; \
- } \
- while (0)
+ code_start = scanner_cursor = loc->start; \
/* Location of scanner cursor. */
-boundary scanner_cursor;
+static boundary scanner_cursor;
-static void adjust_location (location *, char const *, size_t);
-#define YY_USER_ACTION adjust_location (loc, yytext, yyleng);
+#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))
-
-/* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
- keep (to construct ID, STRINGS etc.). Use the following macros to
- use it.
-
- Use STRING_GROW to append what has just been matched, and
- STRING_FINISH to end the string (it puts the ending 0).
- STRING_FINISH also stores this string in LAST_STRING, which can be
- used, and which is used by STRING_FREE to free the last string. */
-
-static struct obstack obstack_for_string;
-
/* A string representing the most recently saved token. */
-static char *last_string;
-
-
-#define STRING_GROW \
- obstack_grow (&obstack_for_string, yytext, yyleng)
-
-#define STRING_FINISH \
- do { \
- obstack_1grow (&obstack_for_string, '\0'); \
- last_string = obstack_finish (&obstack_for_string); \
- } while (0)
-
-#define STRING_FREE \
- obstack_free (&obstack_for_string, last_string)
+char *last_string;
void
-scanner_last_string_free (void)
+gram_scanner_last_string_free (void)
{
STRING_FREE;
}
-/* Within well-formed rules, RULE_LENGTH is the number of values in
- the current rule so far, which says where to find `$0' with respect
- to the top of the stack. It is not the same as the rule->length in
- the case of mid rule actions.
+/* The location of the most recently saved token, if it was a
+ BRACED_CODE token; otherwise, this has an unspecified value. */
+location gram_last_braced_code_loc;
- Outside of well-formed rules, RULE_LENGTH has an undefined value. */
-static int rule_length;
-
-static void handle_dollar (int token_type, char *cp, location loc);
-static void handle_at (int token_type, char *cp, location loc);
-static void handle_syncline (char *args);
+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_end_of_file (boundary, char const *);
+static void unexpected_eof (boundary, char const *);
+static void unexpected_newline (boundary, char const *);
%}
-%x SC_COMMENT SC_LINE_COMMENT SC_YACC_COMMENT
-%x SC_STRING SC_CHARACTER
-%x SC_AFTER_IDENTIFIER
+ /* A C-like comment in directives/rules. */
+%x SC_YACC_COMMENT
+ /* Strings and characters in directives/rules. */
%x SC_ESCAPED_STRING SC_ESCAPED_CHARACTER
-%x SC_PRE_CODE SC_BRACED_CODE SC_PROLOGUE SC_EPILOGUE
+ /* 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
letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
id {letter}({letter}|[0-9])*
/* Parent context state, when applicable. */
int context_state IF_LINT (= 0);
- /* Token type to return, when applicable. */
- int token_type IF_LINT (= 0);
-
/* Location of most recent identifier, when applicable. */
- location id_loc IF_LINT (= *loc);
+ location id_loc IF_LINT (= empty_location);
- /* Where containing code started, when applicable. */
- boundary code_start IF_LINT (= loc->start);
+ /* 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 IF_LINT (= loc->start);
+ boundary token_start IF_LINT (= scanner_cursor);
%}
| Scanning white space. |
`-----------------------*/
-<INITIAL,SC_AFTER_IDENTIFIER,SC_PRE_CODE>
+<INITIAL,SC_AFTER_IDENTIFIER>
{
- [ \f\n\t\v] ;
-
- /* Comments. */
- "/*" token_start = loc->start; context_state = YY_START; BEGIN SC_YACC_COMMENT;
+ /* Comments and white space. */
+ "," warn_at (*loc, _("stray `,' treated as white space"));
+ [ \f\n\t\v] |
"//".* ;
+ "/*" {
+ 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);
+ handle_syncline (yytext + sizeof "#line " - 1, *loc);
}
}
`----------------------------*/
<INITIAL>
{
- "%binary" return PERCENT_NONASSOC;
- "%debug" return PERCENT_DEBUG;
- "%define" return PERCENT_DEFINE;
- "%defines" return PERCENT_DEFINES;
- "%destructor" token_type = PERCENT_DESTRUCTOR; BEGIN SC_PRE_CODE;
- "%dprec" return PERCENT_DPREC;
- "%error"[-_]"verbose" return PERCENT_ERROR_VERBOSE;
- "%expect" return PERCENT_EXPECT;
- "%file-prefix" return PERCENT_FILE_PREFIX;
+ "%after-header" return PERCENT_AFTER_HEADER;
+ "%before-header" return PERCENT_BEFORE_HEADER;
+ "%binary" return PERCENT_NONASSOC;
+ "%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;
+ "%end-header" return PERCENT_END_HEADER;
+ "%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;
- "%glr-parser" return PERCENT_GLR_PARSER;
- "%left" return PERCENT_LEFT;
- "%lex-param" token_type = PERCENT_LEX_PARAM; BEGIN SC_PRE_CODE;
- "%locations" return PERCENT_LOCATIONS;
- "%merge" return PERCENT_MERGE;
- "%name"[-_]"prefix" return PERCENT_NAME_PREFIX;
- "%no"[-_]"lines" return PERCENT_NO_LINES;
- "%nonassoc" return PERCENT_NONASSOC;
- "%nterm" return PERCENT_NTERM;
- "%output" return PERCENT_OUTPUT;
- "%parse-param" token_type = PERCENT_PARSE_PARAM; BEGIN SC_PRE_CODE;
- "%prec" rule_length--; return PERCENT_PREC;
- "%printer" token_type = PERCENT_PRINTER; BEGIN SC_PRE_CODE;
- "%pure"[-_]"parser" return PERCENT_PURE_PARSER;
- "%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" token_type = PERCENT_UNION; BEGIN SC_PRE_CODE;
- "%verbose" return PERCENT_VERBOSE;
- "%yacc" return PERCENT_YACC;
+ "%initial-action" return PERCENT_INITIAL_ACTION;
+ "%glr-parser" return PERCENT_GLR_PARSER;
+ "%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;
+ "%start-header" return PERCENT_START_HEADER;
+ "%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;
{directive} {
complain_at (*loc, _("invalid directive: %s"), quote (yytext));
}
"=" return EQUAL;
- "|" rule_length = 0; return PIPE;
+ "|" return PIPE;
";" return SEMICOLON;
- "," {
- warn_at (*loc, _("stray `,' treated as white space"));
- }
-
{id} {
- val->symbol = symbol_get (yytext, *loc);
+ val->uniqstr = uniqstr_new (yytext);
id_loc = *loc;
- rule_length++;
BEGIN SC_AFTER_IDENTIFIER;
}
{int} {
- unsigned long num;
- set_errno (0);
- num = strtoul (yytext, 0, 10);
- if (INT_MAX < num || get_errno ())
- {
- complain_at (*loc, _("integer out of range: %s"), quote (yytext));
- num = INT_MAX;
- }
- val->integer = num;
+ val->integer = scan_integer (yytext, 10, *loc);
+ return INT;
+ }
+ 0[xX][0-9abcdefABCDEF]+ {
+ val->integer = scan_integer (yytext, 16, *loc);
return INT;
}
"'" STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_CHARACTER;
/* Strings. */
- "\"" STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_STRING;
+ "\"" token_start = loc->start; BEGIN SC_ESCAPED_STRING;
/* Prologue. */
"%{" code_start = loc->start; BEGIN SC_PROLOGUE;
/* Code in between braces. */
"{" {
STRING_GROW;
- token_type = BRACED_CODE;
braces_level = 0;
code_start = loc->start;
BEGIN SC_BRACED_CODE;
"%%" {
static int percent_percent_count;
if (++percent_percent_count == 2)
- {
- code_start = loc->start;
- BEGIN SC_EPILOGUE;
- }
+ BEGIN SC_EPILOGUE;
return PERCENT_PERCENT;
}
. {
complain_at (*loc, _("invalid character: %s"), quote (yytext));
}
+
+ <<EOF>> {
+ loc->start = loc->end = scanner_cursor;
+ yyterminate ();
+ }
}
<SC_AFTER_IDENTIFIER>
{
":" {
- rule_length = 0;
*loc = id_loc;
BEGIN INITIAL;
return ID_COLON;
{
"*/" BEGIN context_state;
.|\n ;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
<SC_COMMENT>
{
"*"{splice}"/" STRING_GROW; BEGIN context_state;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
}
- /*----------------------------------------------------------------.
- | Scanning a C string, including its escapes. The initial `"' is |
- | already eaten. |
- `----------------------------------------------------------------*/
+ /*------------------------------------------------.
+ | Scanning a Bison string, including its escapes. |
+ | The initial quote is already eaten. |
+ `------------------------------------------------*/
<SC_ESCAPED_STRING>
{
"\"" {
- STRING_GROW;
STRING_FINISH;
loc->start = token_start;
val->chars = last_string;
- rule_length++;
BEGIN INITIAL;
return STRING;
}
-
- .|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ \n unexpected_newline (token_start, "\""); BEGIN INITIAL;
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN INITIAL;
}
- /*---------------------------------------------------------------.
- | Scanning a C character, decoding its escapes. The initial "'" |
- | is already eaten. |
- `---------------------------------------------------------------*/
+ /*----------------------------------------------------------.
+ | Scanning a Bison character literal, decoding its escapes. |
+ | The initial quote is already eaten. |
+ `----------------------------------------------------------*/
<SC_ESCAPED_CHARACTER>
{
"'" {
- unsigned char last_string_1;
STRING_GROW;
STRING_FINISH;
loc->start = token_start;
- val->symbol = symbol_get (last_string, *loc);
- symbol_class_set (val->symbol, token_sym, *loc);
- last_string_1 = last_string[1];
- symbol_user_token_number_set (val->symbol, last_string_1, *loc);
+ val->character = last_string[1];
STRING_FREE;
- rule_length++;
BEGIN INITIAL;
- return ID;
+ return CHAR;
}
+ \n unexpected_newline (token_start, "'"); BEGIN INITIAL;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
+}
- .|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+<SC_ESCAPED_CHARACTER,SC_ESCAPED_STRING>
+{
+ \0 complain_at (*loc, _("invalid null character"));
}
<SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>
{
\\[0-7]{1,3} {
- unsigned long c = strtoul (yytext + 1, 0, 8);
+ unsigned long int c = strtoul (yytext + 1, NULL, 8);
if (UCHAR_MAX < c)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
+ else if (! c)
+ complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
\\x[0-9abcdefABCDEF]+ {
- unsigned long c;
- set_errno (0);
- c = strtoul (yytext + 2, 0, 16);
- if (UCHAR_MAX < c || get_errno ())
+ verify (UCHAR_MAX < ULONG_MAX);
+ unsigned long int c = strtoul (yytext + 2, NULL, 16);
+ if (UCHAR_MAX < c)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
+ else if (! c)
+ complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
int c = convert_ucn_to_byte (yytext);
if (c < 0)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
+ else if (! c)
+ complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
}
}
+ /*--------------------------------------------.
+ | Scanning user-code characters and strings. |
+ `--------------------------------------------*/
- /*----------------------------------------------------------.
- | Scanning a C character without decoding its escapes. The |
- | initial "'" is already eaten. |
- `----------------------------------------------------------*/
+<SC_CHARACTER,SC_STRING>
+{
+ {splice}|\\{splice}[^\n\[\]] STRING_GROW;
+}
<SC_CHARACTER>
{
- "'" STRING_GROW; BEGIN context_state;
- \\{splice}[^$@\[\]] STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+ "'" STRING_GROW; BEGIN context_state;
+ \n unexpected_newline (token_start, "'"); BEGIN context_state;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN context_state;
}
-
- /*----------------------------------------------------------------.
- | Scanning a C string, without decoding its escapes. The initial |
- | `"' is already eaten. |
- `----------------------------------------------------------------*/
-
<SC_STRING>
{
- "\"" STRING_GROW; BEGIN context_state;
- \\{splice}[^$@\[\]] STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ "\"" STRING_GROW; BEGIN context_state;
+ \n unexpected_newline (token_start, "\""); BEGIN context_state;
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN context_state;
}
}
- /*---------------------------------------------------------------.
- | Scanning after %union etc., possibly followed by white space. |
- | For %union only, allow arbitrary C code to appear before the |
- | following brace, as an extension to POSIX. |
- `---------------------------------------------------------------*/
-<SC_PRE_CODE>
-{
- . {
- bool valid = yytext[0] == '{' || token_type == PERCENT_UNION;
- scanner_cursor.column -= mbsnwidth (yytext, yyleng, 0);
- yyless (0);
-
- if (valid)
- {
- braces_level = -1;
- code_start = loc->start;
- BEGIN SC_BRACED_CODE;
- }
- else
- {
- complain_at (*loc, _("missing `{' in `%s'"),
- token_name (token_type));
- obstack_sgrow (&obstack_for_string, "{}");
- STRING_FINISH;
- val->chars = last_string;
- BEGIN INITIAL;
- return token_type;
- }
- }
-}
-
-
- /*---------------------------------------------------------------.
- | Scanning some code in braces (%union and actions). The initial |
- | "{" is already eaten. |
- `---------------------------------------------------------------*/
+ /*-----------------------------------------------------------.
+ | Scanning some code in braces (actions). The initial "{" is |
+ | already eaten. |
+ `-----------------------------------------------------------*/
<SC_BRACED_CODE>
{
"{"|"<"{splice}"%" STRING_GROW; braces_level++;
"%"{splice}">" STRING_GROW; braces_level--;
"}" {
- bool outer_brace = --braces_level < 0;
-
- /* As an undocumented Bison extension, append `;' before the last
- brace in braced code, so that the user code can omit trailing
- `;'. But do not append `;' if emulating Yacc, since Yacc does
- not append one.
-
- FIXME: Bison should warn if a semicolon seems to be necessary
- here, and should omit the semicolon if it seems unnecessary
- (e.g., after ';', '{', or '}', each followed by comments or
- white space). Such a warning shouldn't depend on --yacc; it
- should depend on a new --pedantic option, which would cause
- Bison to warn if it detects an extension to POSIX. --pedantic
- should also diagnose other Bison extensions like %yacc.
- Perhaps there should also be a GCC-style --pedantic-errors
- option, so that such warnings are diagnosed as errors. */
- if (outer_brace && ! yacc_flag)
- obstack_1grow (&obstack_for_string, ';');
-
obstack_1grow (&obstack_for_string, '}');
- if (outer_brace)
+ --braces_level;
+ if (braces_level < 0)
{
STRING_FINISH;
- rule_length++;
loc->start = code_start;
val->chars = last_string;
+ gram_last_braced_code_loc = *loc;
BEGIN INITIAL;
- return token_type;
+ return BRACED_CODE;
}
}
(as `<' `<%'). */
"<"{splice}"<" STRING_GROW;
- "$"("<"{tag}">")?(-?[0-9]+|"$") handle_dollar (token_type, yytext, *loc);
- "@"(-?[0-9]+|"$") handle_at (token_type, yytext, *loc);
-
- <<EOF>> unexpected_end_of_file (code_start, "}");
+ <<EOF>> unexpected_eof (code_start, "}"); BEGIN INITIAL;
}
return PROLOGUE;
}
- <<EOF>> unexpected_end_of_file (code_start, "%}");
+ <<EOF>> unexpected_eof (code_start, "%}"); BEGIN INITIAL;
}
}
- /*----------------------------------------------------------------.
- | By default, grow the string obstack with the input, escaping M4 |
- | quoting characters. |
- `----------------------------------------------------------------*/
-
-<SC_COMMENT,SC_LINE_COMMENT,SC_STRING,SC_CHARACTER,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
-{
- \$ obstack_sgrow (&obstack_for_string, "$][");
- \@ obstack_sgrow (&obstack_for_string, "@@");
- \[ obstack_sgrow (&obstack_for_string, "@{");
- \] obstack_sgrow (&obstack_for_string, "@}");
- .|\n STRING_GROW;
-}
+ /*-----------------------------------------------------.
+ | 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;
%%
-/* Set *LOC and adjust scanner cursor to account for token TOKEN of
- size SIZE. */
-
-static void
-adjust_location (location *loc, char const *token, size_t size)
-{
- int line = scanner_cursor.line;
- int column = scanner_cursor.column;
- char const *p0 = token;
- char const *p = token;
- char const *lim = token + size;
-
- loc->start = scanner_cursor;
-
- for (p = token; p < lim; p++)
- switch (*p)
- {
- case '\n':
- line++;
- column = 1;
- p0 = p + 1;
- break;
-
- case '\t':
- column += mbsnwidth (p0, p - p0, 0);
- column += 8 - ((column - 1) & 7);
- p0 = p + 1;
- break;
- }
-
- scanner_cursor.line = line;
- scanner_cursor.column = column + mbsnwidth (p0, p - p0, 0);
-
- loc->end = scanner_cursor;
-}
-
-
/* 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 s = fread (buf, 1, size, fp);
- if (s)
+ size_t bytes_read = fread (buf, 1, size, fp);
+ if (bytes_read)
{
- char *w = memchr (buf, '\r', s);
+ char *w = memchr (buf, '\r', bytes_read);
if (w)
{
char const *r = ++w;
- char const *lim = buf + s;
+ char const *lim = buf + bytes_read;
for (;;)
{
}
}
- return s;
-}
-
-
-/*------------------------------------------------------------------.
-| TEXT is pointing to a wannabee semantic value (i.e., a `$'). |
-| |
-| Possible inputs: $[<TYPENAME>]($|integer) |
-| |
-| Output to OBSTACK_FOR_STRING a reference to this semantic value. |
-`------------------------------------------------------------------*/
-
-static inline bool
-handle_action_dollar (char *text, location loc)
-{
- const char *type_name = NULL;
- char *cp = text + 1;
-
- if (! current_rule)
- return false;
-
- /* Get the type name if explicit. */
- if (*cp == '<')
- {
- type_name = ++cp;
- while (*cp != '>')
- ++cp;
- *cp = '\0';
- ++cp;
- }
-
- if (*cp == '$')
- {
- if (!type_name)
- type_name = symbol_list_n_type_name_get (current_rule, loc, 0);
- if (!type_name && typed)
- complain_at (loc, _("$$ of `%s' has no declared type"),
- current_rule->sym->tag);
- if (!type_name)
- type_name = "";
- obstack_fgrow1 (&obstack_for_string,
- "]b4_lhs_value([%s])[", type_name);
- }
- else
- {
- long num;
- set_errno (0);
- num = strtol (cp, 0, 10);
-
- if (INT_MIN <= num && num <= rule_length && ! get_errno ())
- {
- int n = num;
- if (!type_name && n > 0)
- type_name = symbol_list_n_type_name_get (current_rule, loc, n);
- if (!type_name && typed)
- complain_at (loc, _("$%d of `%s' has no declared type"),
- n, current_rule->sym->tag);
- if (!type_name)
- type_name = "";
- obstack_fgrow3 (&obstack_for_string,
- "]b4_rhs_value([%d], [%d], [%s])[",
- rule_length, n, type_name);
- }
- else
- complain_at (loc, _("integer out of range: %s"), quote (text));
- }
-
- return true;
+ return bytes_read;
}
-/*-----------------------------------------------------------------.
-| Dispatch onto handle_action_dollar, or handle_destructor_dollar, |
-| depending upon TOKEN_TYPE. |
-`-----------------------------------------------------------------*/
-
-static void
-handle_dollar (int token_type, char *text, location loc)
-{
- switch (token_type)
- {
- case BRACED_CODE:
- if (handle_action_dollar (text, loc))
- return;
- break;
-
- case PERCENT_DESTRUCTOR:
- case PERCENT_PRINTER:
- if (text[1] == '$')
- {
- obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar[");
- return;
- }
- break;
-
- default:
- break;
- }
-
- complain_at (loc, _("invalid value: %s"), quote (text));
-}
-
/*------------------------------------------------------.
-| TEXT is a location token (i.e., a `@...'). Output to |
-| OBSTACK_FOR_STRING a reference to this location. |
+| Scan NUMBER for a base-BASE integer at location LOC. |
`------------------------------------------------------*/
-static inline bool
-handle_action_at (char *text, location loc)
+static unsigned long int
+scan_integer (char const *number, int base, location loc)
{
- char *cp = text + 1;
- locations_flag = 1;
-
- if (! current_rule)
- return false;
-
- if (*cp == '$')
- obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
- else
- {
- long num;
- set_errno (0);
- num = strtol (cp, 0, 10);
-
- if (INT_MIN <= num && num <= rule_length && ! get_errno ())
- {
- int n = num;
- obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location([%d], [%d])[",
- rule_length, n);
- }
- else
- complain_at (loc, _("integer out of range: %s"), quote (text));
- }
+ verify (INT_MAX < ULONG_MAX);
+ unsigned long int num = strtoul (number, NULL, base);
- return true;
-}
-
-
-/*-------------------------------------------------------------------.
-| Dispatch onto handle_action_at, or handle_destructor_at, depending |
-| upon CODE_KIND. |
-`-------------------------------------------------------------------*/
-
-static void
-handle_at (int token_type, char *text, location loc)
-{
- switch (token_type)
+ if (INT_MAX < num)
{
- case BRACED_CODE:
- handle_action_at (text, loc);
- return;
-
- case PERCENT_DESTRUCTOR:
- case PERCENT_PRINTER:
- if (text[1] == '$')
- {
- obstack_sgrow (&obstack_for_string, "]b4_at_dollar[");
- return;
- }
- break;
-
- default:
- break;
+ complain_at (loc, _("integer out of range: %s"), quote (number));
+ num = INT_MAX;
}
- complain_at (loc, _("invalid value: %s"), quote (text));
+ return num;
}
static int
convert_ucn_to_byte (char const *ucn)
{
- unsigned long code = strtoul (ucn + 2, 0, 16);
+ 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
`----------------------------------------------------------------*/
static void
-handle_syncline (char *args)
+handle_syncline (char *args, location loc)
{
- int lineno = strtol (args, &args, 10);
- const char *file = NULL;
- file = strchr (args, '"') + 1;
- *strchr (file, '"') = 0;
- scanner_cursor.file = current_file = xstrdup (file);
- scanner_cursor.line = lineno;
- scanner_cursor.column = 1;
+ char *after_num;
+ unsigned long int lineno = strtoul (args, &after_num, 10);
+ char *file = strchr (after_num, '"') + 1;
+ *strchr (file, '"') = '\0';
+ if (INT_MAX <= lineno)
+ {
+ warn_at (loc, _("line number overflow"));
+ lineno = INT_MAX;
+ }
+ current_file = uniqstr_new (file);
+ 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;
+ 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. |
-| After reporting the problem, pretend that TOKEN_END was found. |
`------------------------------------------------------------------------*/
static void
-unexpected_end_of_file (boundary start, char const *token_end)
+unexpected_eof (boundary start, char const *token_end)
{
- size_t i = strlen (token_end);
+ unexpected_end (start, N_("missing `%s' at end of file"), token_end);
+}
- location loc;
- loc.start = start;
- loc.end = scanner_cursor;
- complain_at (loc, _("missing `%s' at end of file"), token_end);
- /* Adjust scanner cursor so that any later message does not count
- the characters about to be inserted. */
- scanner_cursor.column -= i;
+/*----------------------------------------.
+| Likewise, but for unexpected newlines. |
+`----------------------------------------*/
- while (i != 0)
- unput (token_end[--i]);
+static void
+unexpected_newline (boundary start, char const *token_end)
+{
+ unexpected_end (start, N_("missing `%s' at end of line"), token_end);
}
`-------------------------*/
void
-scanner_initialize (void)
+gram_scanner_initialize (void)
{
obstack_init (&obstack_for_string);
}
`-----------------------------------------------*/
void
-scanner_free (void)
+gram_scanner_free (void)
{
obstack_free (&obstack_for_string, 0);
/* Reclaim Flex's buffers. */
projects / bison.git / blobdiff