/* 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 nounput never-interactive stack
+%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
+
+#define FLEX_PREFIX(Id) gram_ ## Id
+#include "flex-scanner.h"
+
#include "complain.h"
-#include "quote.h"
-#include "getargs.h"
+#include "files.h"
#include "gram.h"
+#include "quotearg.h"
#include "reader.h"
+#include "uniqstr.h"
-/* Each time we match a string, move the end cursor to its end. */
-#define YY_USER_ACTION LOCATION_COLUMNS (*yylloc, yyleng)
-#define YY_LINES LOCATION_LINES (*yylloc, yyleng); lineno += yyleng;
-#define YY_STEP LOCATION_STEP (*yylloc)
+#include <mbswidth.h>
+#include <quote.h>
+#include "scan-gram.h"
-/* STRING_OBSTACK -- Used to store all the characters that we need to
- keep (to construct ID, STRINGS etc.). Use the following macros to
- use it.
+#define YY_DECL GRAM_LEX_DECL
- Use YY_OBS_GROW to append what has just been matched, and
- YY_OBS_FINISH to end the string (it puts the ending 0).
- YY_OBS_FINISH also stores this string in LAST_STRING, which can be
- used, and which is used by YY_OBS_FREE to free the last string. */
+#define YY_USER_INIT \
+ code_start = scanner_cursor = loc->start; \
-static struct obstack string_obstack;
-char *last_string;
+/* Location of scanner cursor. */
+static boundary scanner_cursor;
-#define YY_OBS_GROW \
- obstack_grow (&string_obstack, yytext, yyleng)
+#define YY_USER_ACTION location_compute (loc, &scanner_cursor, yytext, yyleng);
-#define YY_OBS_FINISH \
- do { \
- obstack_1grow (&string_obstack, '\0'); \
- last_string = obstack_finish (&string_obstack); \
- } while (0)
+static size_t no_cr_read (FILE *, char *, size_t);
+#define YY_INPUT(buf, result, size) ((result) = no_cr_read (yyin, buf, size))
-#define YY_OBS_FREE \
- do { \
- obstack_free (&string_obstack, last_string); \
- } while (0)
+/* A string representing the most recently saved token. */
+char *last_string;
void
-scanner_last_string_free (void)
+gram_scanner_last_string_free (void)
{
- YY_OBS_FREE;
+ STRING_FREE;
}
+/* 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;
-/* This is only to avoid GCC warnings. */
-#define YY_USER_INIT if (yycontrol) {;};
-
-
-static int braces_level = 0;
-static int percent_percent_count = 0;
-
-static void handle_dollar PARAMS ((char *cp));
-static void handle_at PARAMS ((char *cp));
+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 *);
%}
-%x SC_COMMENT
-%x SC_STRING SC_CHARACTER
+ /* 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_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])*
+directive %{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>]+
-id [.a-zA-Z][.a-zA-Z_0-9]*
-int [0-9]+
-eols (\n|\r|\n\r|\r\n)+
-blanks [ \t\f]+
+/* Zero or more instances of backslash-newline. Following GCC, allow
+ white space between the backslash and the newline. */
+splice (\\[ \f\t\v]*\n)*
%%
%{
- /* At each yylex invocation, mark the current position as the
- start of the next token. */
-#define TR_POS 0
-#if TR_POS
- fprintf (stderr, "FOO1: ");
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, "\n");
-#endif
- YY_STEP;
-#if TR_POS
- fprintf (stderr, "BAR1: ");
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, "\n");
-#endif
+ /* Nesting level of the current code in braces. */
+ int braces_level IF_LINT (= 0);
+
+ /* Parent context state, when applicable. */
+ int context_state IF_LINT (= 0);
+
+ /* Location of most recent identifier, when applicable. */
+ location id_loc IF_LINT (= 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 IF_LINT (= scanner_cursor);
%}
+ /*-----------------------.
+ | Scanning white space. |
+ `-----------------------*/
+
+<INITIAL,SC_AFTER_IDENTIFIER>
+{
+ /* 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, *loc);
+ }
+}
+
+
/*----------------------------.
| Scanning Bison directives. |
`----------------------------*/
<INITIAL>
{
- "%binary" return PERCENT_NONASSOC;
- "%debug" return PERCENT_DEBUG;
- "%define" return PERCENT_DEFINE;
- "%defines" return PERCENT_DEFINES;
- "%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;
- "%left" return PERCENT_LEFT;
- "%locations" return PERCENT_LOCATIONS;
- "%name"[-_]"prefix" return PERCENT_NAME_PREFIX;
- "%no"[-_]"lines" return PERCENT_NO_LINES;
- "%nonassoc" return PERCENT_NONASSOC;
- "%nterm" return PERCENT_NTERM;
- "%output" return PERCENT_OUTPUT;
- "%prec" return PERCENT_PREC;
- "%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" return PERCENT_UNION;
- "%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;
- ":" return COLON;
"|" return PIPE;
";" return SEMICOLON;
- {eols} YY_LINES; YY_STEP;
- {blanks} YY_STEP;
- {id} {
- yylval->symbol = getsym (yytext);
- return ID;
+ {id} {
+ val->uniqstr = uniqstr_new (yytext);
+ id_loc = *loc;
+ BEGIN SC_AFTER_IDENTIFIER;
}
- {int} yylval->integer = strtol (yytext, 0, 10); return INT;
+ {int} {
+ val->integer = scan_integer (yytext, 10, *loc);
+ return INT;
+ }
+ 0[xX][0-9abcdefABCDEF]+ {
+ val->integer = scan_integer (yytext, 16, *loc);
+ return INT;
+ }
/* Characters. We don't check there is only one. */
- \' YY_OBS_GROW; yy_push_state (SC_ESCAPED_CHARACTER);
+ "'" STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_CHARACTER;
/* Strings. */
- \" YY_OBS_GROW; yy_push_state (SC_ESCAPED_STRING);
-
- /* Comments. */
- "/*" yy_push_state (SC_COMMENT);
- "//".* YY_STEP;
+ "\"" token_start = loc->start; BEGIN SC_ESCAPED_STRING;
/* Prologue. */
- "%{" yy_push_state (SC_PROLOGUE);
+ "%{" code_start = loc->start; BEGIN SC_PROLOGUE;
/* Code in between braces. */
- "{" YY_OBS_GROW; ++braces_level; yy_push_state (SC_BRACED_CODE);
+ "{" {
+ STRING_GROW;
+ braces_level = 0;
+ code_start = loc->start;
+ BEGIN SC_BRACED_CODE;
+ }
/* A type. */
- "<"[^>]+">" {
- obstack_grow (&string_obstack, yytext + 1, yyleng - 2);
- YY_OBS_FINISH;
- yylval->string = last_string;
+ "<"{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)
- yy_push_state (SC_EPILOGUE);
+ BEGIN SC_EPILOGUE;
return PERCENT_PERCENT;
}
- . {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": invalid character: `%c'\n", *yytext);
- YY_STEP;
+ . {
+ complain_at (*loc, _("invalid character: %s"), quote (yytext));
+ }
+
+ <<EOF>> {
+ loc->start = loc->end = scanner_cursor;
+ yyterminate ();
}
}
- /*------------------------------------------------------------.
- | Whatever the start condition (but those which correspond to |
- | entity `swallowed' by Bison: SC_ESCAPED_STRING and |
- | SC_ESCAPED_CHARACTER), no M4 character must escape as is. |
- `------------------------------------------------------------*/
+ /*-----------------------------------------------------------------.
+ | Scanning after an identifier, checking whether a colon is next. |
+ `-----------------------------------------------------------------*/
-<SC_COMMENT,SC_STRING,SC_CHARACTER,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
+<SC_AFTER_IDENTIFIER>
{
- \[ if (YY_START != SC_COMMENT) obstack_sgrow (&string_obstack, "@<:@");
- \] if (YY_START != SC_COMMENT) obstack_sgrow (&string_obstack, "@:>@");
+ ":" {
+ *loc = id_loc;
+ BEGIN INITIAL;
+ return ID_COLON;
+ }
+ . {
+ scanner_cursor.column -= mbsnwidth (yytext, yyleng, 0);
+ yyless (0);
+ *loc = id_loc;
+ BEGIN INITIAL;
+ return ID;
+ }
+ <<EOF>> {
+ *loc = id_loc;
+ BEGIN INITIAL;
+ return ID;
+ }
}
+ /*---------------------------------------------------------------.
+ | Scanning a Yacc comment. The initial `/ *' is already eaten. |
+ `---------------------------------------------------------------*/
- /*-----------------------------------------------------------.
- | Scanning a C comment. The initial `/ *' is already eaten. |
- `-----------------------------------------------------------*/
-
-<SC_COMMENT>
+<SC_YACC_COMMENT>
{
- "*/" { /* End of the comment. */
- if (yy_top_state () == INITIAL)
- {
- YY_STEP;
- }
- else
- {
- YY_OBS_GROW;
- }
- yy_pop_state ();
- }
+ "*/" BEGIN context_state;
+ .|\n ;
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
+}
- [^\[\]*\n\r]+ if (yy_top_state () != INITIAL) YY_OBS_GROW;
- {eols} if (yy_top_state () != INITIAL) YY_OBS_GROW; YY_LINES;
- . /* Stray `*'. */if (yy_top_state () != INITIAL) YY_OBS_GROW;
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a comment\n");
- yy_pop_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 C string, including its escapes. The initial `"' is |
- | already eaten. |
- `----------------------------------------------------------------*/
+ /*--------------------------------------------------------------.
+ | Scanning a line comment. The initial `//' is already eaten. |
+ `--------------------------------------------------------------*/
-<SC_ESCAPED_STRING>
+<SC_LINE_COMMENT>
{
- \" {
- assert (yy_top_state () == INITIAL);
- YY_OBS_GROW;
- YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
- return STRING;
- }
+ "\n" STRING_GROW; BEGIN context_state;
+ {splice} STRING_GROW;
+ <<EOF>> BEGIN context_state;
+}
- [^\"\n\r\\]+ YY_OBS_GROW;
- {eols} obstack_1grow (&string_obstack, '\n'); YY_LINES;
+ /*------------------------------------------------.
+ | Scanning a Bison string, including its escapes. |
+ | The initial quote is already eaten. |
+ `------------------------------------------------*/
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a string\n");
- assert (yy_top_state () == INITIAL);
- YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
+<SC_ESCAPED_STRING>
+{
+ "\"" {
+ STRING_FINISH;
+ loc->start = token_start;
+ val->chars = last_string;
+ BEGIN INITIAL;
return STRING;
}
+ \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>
{
- \' {
- YY_OBS_GROW;
- assert (yy_top_state () == INITIAL);
- {
- YY_OBS_FINISH;
- yylval->symbol = getsym (last_string);
- symbol_class_set (yylval->symbol, token_sym);
- symbol_user_token_number_set (yylval->symbol, last_string[1]);
- YY_OBS_FREE;
- yy_pop_state ();
- return ID;
- }
+ "'" {
+ STRING_GROW;
+ STRING_FINISH;
+ loc->start = token_start;
+ val->character = last_string[1];
+ STRING_FREE;
+ BEGIN INITIAL;
+ return CHAR;
}
+ \n unexpected_newline (token_start, "'"); BEGIN INITIAL;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
+}
- [^\'\n\r\\] YY_OBS_GROW;
-
- {eols} obstack_1grow (&string_obstack, '\n'); YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a character\n");
- assert (yy_top_state () == INITIAL);
- YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
- return CHARACTER;
- }
+<SC_ESCAPED_CHARACTER,SC_ESCAPED_STRING>
+{
+ \0 complain_at (*loc, _("invalid null character"));
}
<SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>
{
- \\[0-7]{3} {
- long c = strtol (yytext + 1, 0, 8);
- if (c > 255)
- {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": invalid escape: %s\n", yytext);
- YY_STEP;
- }
+ \\[0-7]{1,3} {
+ 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 (&string_obstack, c);
+ obstack_1grow (&obstack_for_string, c);
}
- \\x[0-9a-fA-F]{2} {
- obstack_1grow (&string_obstack, strtol (yytext + 2, 0, 16));
+ \\x[0-9abcdefABCDEF]+ {
+ 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);
}
- \\a obstack_1grow (&string_obstack, '\a');
- \\b obstack_1grow (&string_obstack, '\b');
- \\f obstack_1grow (&string_obstack, '\f');
- \\n obstack_1grow (&string_obstack, '\n');
- \\r obstack_1grow (&string_obstack, '\r');
- \\t obstack_1grow (&string_obstack, '\t');
- \\v obstack_1grow (&string_obstack, '\v');
- \\[\\""] obstack_1grow (&string_obstack, yytext[1]);
- \\. {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unrecognized escape: %s\n", yytext);
- YY_OBS_GROW;
+ \\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 escape sequence: %s"), quote (yytext));
+ else if (! c)
+ complain_at (*loc, _("invalid null character: %s"), quote (yytext));
+ else
+ obstack_1grow (&obstack_for_string, c);
+ }
+ \\(.|\n) {
+ complain_at (*loc, _("unrecognized escape sequence: %s"), quote (yytext));
+ STRING_GROW;
}
}
+ /*--------------------------------------------.
+ | 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>
{
- \' {
- YY_OBS_GROW;
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
-
- [^\[\]\'\n\r\\] YY_OBS_GROW;
- \\. YY_OBS_GROW;
-
- {eols} YY_OBS_GROW; YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a character\n");
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
+ "'" 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>
{
- \" {
- assert (yy_top_state () != INITIAL);
- YY_OBS_GROW;
- yy_pop_state ();
- }
-
- [^\[\]\"\n\r\\]+ YY_OBS_GROW;
- \\. YY_OBS_GROW;
-
- {eols} YY_OBS_GROW; YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a string\n");
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
+ "\"" STRING_GROW; BEGIN context_state;
+ \n unexpected_newline (token_start, "\""); BEGIN context_state;
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN context_state;
}
<SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
{
- /* Characters. We don't check there is only one. */
- \' YY_OBS_GROW; yy_push_state (SC_CHARACTER);
-
- /* Strings. */
- \" YY_OBS_GROW; yy_push_state (SC_STRING);
-
- /* Comments. */
- "/*" YY_OBS_GROW; yy_push_state (SC_COMMENT);
- "//".* YY_OBS_GROW;
+ "'" {
+ 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 (%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--;
"}" {
- YY_OBS_GROW;
- if (--braces_level == 0)
+ obstack_1grow (&obstack_for_string, '}');
+
+ --braces_level;
+ if (braces_level < 0)
{
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
+ STRING_FINISH;
+ loc->start = code_start;
+ val->chars = last_string;
+ gram_last_braced_code_loc = *loc;
+ BEGIN INITIAL;
return BRACED_CODE;
}
}
- "{" YY_OBS_GROW; braces_level++;
-
- "$"("<".*">")?(-?[0-9]+|"$") { handle_dollar (yytext); }
- "@"(-?[0-9]+|"$") { handle_at (yytext); }
-
- [^\[\]$/\'\"@\{\}\n\r]+ YY_OBS_GROW;
- {eols} YY_OBS_GROW; YY_LINES;
-
- /* A lose $, or /, or etc. */
- . YY_OBS_GROW;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a braced code\n");
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
- return BRACED_CODE;
- }
+ /* Tokenize `<<%' correctly (as `<<' `%') rather than incorrrectly
+ (as `<' `<%'). */
+ "<"{splice}"<" STRING_GROW;
+ <<EOF>> unexpected_eof (code_start, "}"); BEGIN INITIAL;
}
<SC_PROLOGUE>
{
"%}" {
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
- return PROLOGUE;
- }
-
- [^\[\]%\n\r]+ YY_OBS_GROW;
- "%"+[^%\}\n\r]+ YY_OBS_GROW;
- {eols} YY_OBS_GROW; YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a prologue\n");
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
+ STRING_FINISH;
+ loc->start = code_start;
+ val->chars = last_string;
+ BEGIN INITIAL;
return PROLOGUE;
}
+ <<EOF>> unexpected_eof (code_start, "%}"); BEGIN INITIAL;
}
/*---------------------------------------------------------------.
| Scanning the epilogue (everything after the second "%%", which |
- | has already been eaten. |
+ | has already been eaten). |
`---------------------------------------------------------------*/
<SC_EPILOGUE>
{
- ([^\[\]]|{eols})+ YY_OBS_GROW;
-
<<EOF>> {
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
+ 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;
+
%%
-/*------------------------------------------------------------------.
-| CP is pointing to a wannabee semantic value (i.e., a `$'). |
-| |
-| Possible inputs: $[<TYPENAME>]($|integer) |
-| |
-| Output to the STRING_OBSTACK a reference to this semantic value. |
-`------------------------------------------------------------------*/
+/* 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 void
-handle_dollar (char *cp)
+static size_t
+no_cr_read (FILE *fp, char *buf, size_t size)
{
- const char *type_name = NULL;
+ 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;
+}
- /* RULE_LENGTH is the number of values in the current rule so far,
- which says where to find `$0' with respect to the top of the
- stack. It is not the same as the rule->length in the case of mid
- rule actions. */
- int rule_length = 0;
- symbol_list *rhs;
- for (rhs = current_rule->next; rhs; rhs = rhs->next)
- ++rule_length;
- ++cp;
- /* Get the type name if explicit. */
- if (*cp == '<')
- {
- type_name = ++cp;
- while (*cp != '>')
- ++cp;
- *cp = '\0';
- ++cp;
- }
+/*------------------------------------------------------.
+| Scan NUMBER for a base-BASE integer at location LOC. |
+`------------------------------------------------------*/
- if (*cp == '$')
- {
- if (!type_name)
- type_name = get_type_name (0, current_rule);
- if (!type_name && typed)
- complain (_("$$ of `%s' has no declared type"),
- current_rule->sym->tag);
- if (!type_name)
- type_name = "";
- obstack_fgrow1 (&string_obstack,
- "]b4_lhs_value([%s])[", type_name);
- }
- else if (isdigit (*cp) || *cp == '-')
- {
- int n = strtol (cp, &cp, 10);
+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 (n > rule_length)
- complain (_("invalid value: %s%d"), "$", n);
- else
- {
- if (!type_name && n > 0)
- type_name = get_type_name (n, current_rule);
- if (!type_name && typed)
- complain (_("$%d of `%s' has no declared type"),
- n, current_rule->sym->tag);
- if (!type_name)
- type_name = "";
- obstack_fgrow3 (&string_obstack,
- "]b4_rhs_value([%d], [%d], [%s])[",
- rule_length, n, type_name);
- }
- }
- else
+ if (INT_MAX < num)
{
- char buf[] = "$c";
- buf[1] = *cp;
- complain (_("%s is invalid"), quote (buf));
+ complain_at (loc, _("integer out of range: %s"), quote (number));
+ num = INT_MAX;
}
+
+ return num;
+}
+
+
+/*------------------------------------------------------------------.
+| Convert universal character name UCN to a single-byte character, |
+| and return that character. Return -1 if UCN does not correspond |
+| to a single-byte character. |
+`------------------------------------------------------------------*/
+
+static int
+convert_ucn_to_byte (char const *ucn)
+{
+ verify (UCHAR_MAX <= INT_MAX);
+ unsigned long int code = strtoul (ucn + 2, NULL, 16);
+
+ /* FIXME: Currently we assume Unicode-compatible unibyte characters
+ on ASCII hosts (i.e., Latin-1 on hosts with 8-bit bytes). On
+ non-ASCII hosts we support only the portable C character set.
+ These limitations should be removed once we add support for
+ multibyte characters. */
+
+ if (UCHAR_MAX < code)
+ return -1;
+
+#if ! ('$' == 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;
}
-/*-------------------------------------------------------.
-| CP is pointing to a location (i.e., a `@'). Output to |
-| STRING_OBSTACK a reference to this location. |
-`-------------------------------------------------------*/
+
+/*----------------------------------------------------------------.
+| Handle `#line INT "FILE"'. ARGS has already skipped `#line '. |
+`----------------------------------------------------------------*/
static void
-handle_at (char *cp)
+handle_syncline (char *args, location loc)
{
- /* RULE_LENGTH is the number of values in the current rule so far,
- which says where to find `$0' with respect to the top of the
- stack. It is not the same as the rule->length in the case of mid
- rule actions. */
- int rule_length = 0;
- symbol_list *rhs;
- for (rhs = current_rule->next; rhs; rhs = rhs->next)
- ++rule_length;
-
- locations_flag = 1;
- ++cp;
-
- if (*cp == '$')
- {
- obstack_sgrow (&string_obstack, "]b4_lhs_location[");
- }
- else if (isdigit (*cp) || *cp == '-')
- {
- int n = strtol (cp, &cp, 10);
- if (n > rule_length)
- complain (_("invalid value: %s%d"), "@", n);
- else
- obstack_fgrow2 (&string_obstack, "]b4_rhs_location([%d], [%d])[",
- rule_length, n);
- }
- else
+ 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)
{
- char buf[] = "@c";
- buf[1] = *cp;
- complain (_("%s is invalid"), quote (buf));
+ 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. |
+`------------------------------------------------------------------------*/
+
+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
-scanner_initialize (void)
+gram_scanner_initialize (void)
{
- obstack_init (&string_obstack);
+ obstack_init (&obstack_for_string);
}
+/*-----------------------------------------------.
+| Free all the memory allocated to the scanner. |
+`-----------------------------------------------*/
+
void
-scanner_free (void)
+gram_scanner_free (void)
{
- obstack_free (&string_obstack, 0);
+ obstack_free (&obstack_for_string, 0);
+ /* Reclaim Flex's buffers. */
+ yy_delete_buffer (YY_CURRENT_BUFFER);
}
projects / bison.git / blobdiff