958 lines
26 KiB
C
958 lines
26 KiB
C
/* Bison Action Scanner -*- C -*-
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Copyright (C) 2006-2012 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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%option debug nodefault noinput nounput noyywrap never-interactive
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%option prefix="code_" outfile="lex.yy.c"
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%{
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/* Work around a bug in flex 2.5.31. See Debian bug 333231
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<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>. */
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#undef code_wrap
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#define code_wrap() 1
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#define FLEX_PREFIX(Id) code_ ## Id
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#include "flex-scanner.h"
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#include "complain.h"
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#include "reader.h"
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#include "getargs.h"
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#include "scan-code.h"
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#include "symlist.h"
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#include <c-ctype.h>
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#include <get-errno.h>
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#include <quote.h>
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/* The current calling start condition: SC_RULE_ACTION or
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SC_SYMBOL_ACTION. */
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# define YY_DECL static char *code_lex (code_props *self, int sc_context)
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YY_DECL;
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#define YY_USER_ACTION location_compute (loc, &loc->end, yytext, yyleng);
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static char *fetch_type_name (char *cp, char const **type_name,
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location dollar_loc);
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static void handle_action_dollar (symbol_list *rule, char *cp,
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location dollar_loc);
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static void handle_action_at (symbol_list *rule, char *cp, location at_loc);
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/* A string to be pushed to obstack after dollar/at has been handled. */
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static char *ref_tail_fields;
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static location the_location;
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static location *loc = &the_location;
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/* A string representing the most recent translation. */
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static char *last_string;
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/* True if an untyped $$ or $n was seen. */
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static bool untyped_var_seen;
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%}
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/* C and C++ comments in code. */
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%x SC_COMMENT SC_LINE_COMMENT
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/* Strings and characters in code. */
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%x SC_STRING SC_CHARACTER
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/* Whether in a rule or symbol action. Specifies the translation
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of $ and @. */
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%x SC_RULE_ACTION SC_SYMBOL_ACTION
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/* POSIX says that a tag must be both an id and a C union member, but
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historically almost any character is allowed in a tag. We disallow
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NUL and newline, as this simplifies our implementation. */
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tag [^\0\n>]+
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/* Zero or more instances of backslash-newline. Following GCC, allow
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white space between the backslash and the newline. */
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splice (\\[ \f\t\v]*\n)*
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/* C style identifier. Must start with letter. Will be used for
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named symbol references. Shall be kept synchronized with
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scan-gram.l "letter" and "id". */
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letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
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id {letter}({letter}|[-0-9])*
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ref -?[0-9]+|{id}|"["{id}"]"|"$"
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%%
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%{
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/* Nesting level of the current code in braces. */
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int braces_level = 0;
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/* Whether a semicolon is probably needed.
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The heuristic is that a semicolon is not needed after '{', '}',
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';', or a C preprocessor directive, and that whitespaces and
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comments do not affect this flag. Note that '{' does not need a
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semicolon because of '{}'. A semicolon may be needed before a
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cpp directive, but don't bother.
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While it is maintained in several start-conditions (factoring
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opportunities), it is meaningful only for SC_RULE_ACTION. */
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bool need_semicolon = false;
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/* Whether in a C preprocessor directive. Don't use a start condition
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for this because, at the end of strings and comments, we still need
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to know whether we're in a directive. */
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bool in_cpp = false;
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/* This scanner is special: it is invoked only once, henceforth
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is expected to return only once. This initialization is
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therefore done once per action to translate. */
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aver (sc_context == SC_SYMBOL_ACTION
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|| sc_context == SC_RULE_ACTION
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|| sc_context == INITIAL);
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BEGIN sc_context;
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%}
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/*------------------------------------------------------------.
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| Scanning a C comment. The initial '/ *' is already eaten. |
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`------------------------------------------------------------*/
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<SC_COMMENT>
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{
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"*"{splice}"/" STRING_GROW; BEGIN sc_context;
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}
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/*--------------------------------------------------------------.
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| Scanning a line comment. The initial '//' is already eaten. |
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`--------------------------------------------------------------*/
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<SC_LINE_COMMENT>
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{
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"\n" STRING_GROW; BEGIN sc_context;
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{splice} STRING_GROW;
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}
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/*--------------------------------------------.
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| Scanning user-code characters and strings. |
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`--------------------------------------------*/
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<SC_CHARACTER,SC_STRING>
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{
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{splice}|\\{splice}. STRING_GROW;
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}
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<SC_CHARACTER>
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{
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"'" STRING_GROW; BEGIN sc_context;
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}
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<SC_STRING>
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{
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"\"" STRING_GROW; BEGIN sc_context;
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}
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<SC_RULE_ACTION,SC_SYMBOL_ACTION>
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{
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"'" {
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STRING_GROW;
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BEGIN SC_CHARACTER;
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need_semicolon = true;
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}
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"\"" {
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STRING_GROW;
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BEGIN SC_STRING;
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need_semicolon = true;
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}
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"/"{splice}"*" {
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STRING_GROW;
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BEGIN SC_COMMENT;
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}
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"/"{splice}"/" {
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STRING_GROW;
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BEGIN SC_LINE_COMMENT;
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}
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[$@] {
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warn_at (*loc, _("stray '%s'"), yytext);
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obstack_escape (&obstack_for_string, yytext);
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need_semicolon = true;
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}
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[\[\]] {
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obstack_escape (&obstack_for_string, yytext);
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need_semicolon = true;
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}
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}
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<SC_RULE_ACTION>
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{
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"$"("<"{tag}">")?{ref} {
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ref_tail_fields = NULL;
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handle_action_dollar (self->rule, yytext, *loc);
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if (ref_tail_fields)
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obstack_sgrow (&obstack_for_string, ref_tail_fields);
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need_semicolon = true;
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}
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"@"{ref} {
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ref_tail_fields = NULL;
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handle_action_at (self->rule, yytext, *loc);
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if (ref_tail_fields)
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obstack_sgrow (&obstack_for_string, ref_tail_fields);
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need_semicolon = true;
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}
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";" STRING_GROW; need_semicolon = false;
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"{" STRING_GROW; ++braces_level; need_semicolon = false;
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"}" {
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bool outer_brace = --braces_level == 0;
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/* As an undocumented Bison extension, append ';' before the last
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brace in braced code, so that the user code can omit trailing
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';'. But do not append ';' if emulating Yacc, since Yacc does
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not append one. This is deprecated since release 2.4.1. */
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if (outer_brace && !yacc_flag && language_prio == default_prio
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&& skeleton_prio == default_prio && need_semicolon && ! in_cpp)
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{
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unsigned int indent = 0;
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warn_at_indent (*loc, &indent,
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_("a ';' might be needed at the end of action code"));
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indent += SUB_INDENT;
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warn_at_indent (*loc, &indent,
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_("future versions of Bison will not add the ';'"));
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obstack_1grow (&obstack_for_string, ';');
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}
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STRING_GROW;
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need_semicolon = false;
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}
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/* Preprocessing directives should only be recognized at the beginning
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of lines, allowing whitespace including comments, but in C/C++,
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'#' can only be the start of preprocessor directives or within
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'#define' directives anyway, so don't bother with begin of line. */
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"#" STRING_GROW; in_cpp = true;
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{splice} STRING_GROW;
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[\n\r] STRING_GROW; if (in_cpp) in_cpp = need_semicolon = false;
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[ \t\f] STRING_GROW;
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/* YYFAIL is undocumented and was formally deprecated in Bison
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2.4.2. */
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YYFAIL {
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STRING_GROW; need_semicolon = true;
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warn_at (*loc, _("use of YYFAIL, which is deprecated and will be"
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" removed"));
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}
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/* The sole purpose of this is to make sure identifiers that merely
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contain YYFAIL don't produce the above warning. */
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[A-Za-z_][0-9A-Za-z_]* STRING_GROW; need_semicolon = true;
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. STRING_GROW; need_semicolon = true;
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}
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<SC_SYMBOL_ACTION>
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{
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"$"("<"{tag}">")?"$" {
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const char *type_name = NULL;
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fetch_type_name (yytext + 1, &type_name, *loc)[-1] = 0;
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obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar(");
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obstack_quote (&obstack_for_string, type_name);
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obstack_sgrow (&obstack_for_string, ")[");
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self->is_value_used = true;
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}
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"@$" {
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obstack_sgrow (&obstack_for_string, "]b4_at_dollar[");
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locations_flag = true;
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}
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}
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<*>
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{
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/* Escape M4 quoting characters in C code. */
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[$@\[\]] obstack_escape (&obstack_for_string, yytext);
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/* By default, grow the string obstack with the input. */
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.|\n STRING_GROW;
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/* End of processing. */
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<<EOF>> STRING_FINISH; return last_string;
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}
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%%
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static inline bool
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is_dot_or_dash (char ch)
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{
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return ch == '.' || ch == '-';
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}
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static inline bool
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contains_dot_or_dash (const char* p)
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{
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for (; *p; ++p)
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if (is_dot_or_dash (*p))
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return true;
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return false;
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}
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/* Defines a variant of a symbolic name resolution. */
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typedef struct
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{
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/* Index in symbol list. */
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unsigned symbol_index;
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/* Matched symbol id and loc. */
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uniqstr id;
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location loc;
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/* Hiding named reference. */
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named_ref* hidden_by;
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/* Error flags. May contain zero (no errors) or
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a combination of VARIANT_* values. */
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unsigned err;
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} variant;
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/* Set when the variant refers to a symbol hidden
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by an explicit symbol reference. */
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#define VARIANT_HIDDEN (1 << 0)
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/* Set when the variant refers to a symbol containing
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dots or dashes. Will require explicit bracketing. */
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#define VARIANT_BAD_BRACKETING (1 << 1)
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/* Set when the variant refers to a symbol which is
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not visible from current midrule. */
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#define VARIANT_NOT_VISIBLE_FROM_MIDRULE (1 << 2)
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static variant *variant_table = NULL;
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static unsigned variant_table_size = 0;
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static unsigned variant_count = 0;
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static variant *
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variant_table_grow (void)
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{
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++variant_count;
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if (variant_count > variant_table_size)
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{
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while (variant_count > variant_table_size)
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variant_table_size = 2 * variant_table_size + 3;
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variant_table = xnrealloc (variant_table, variant_table_size,
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sizeof *variant_table);
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}
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return &variant_table[variant_count - 1];
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}
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static void
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variant_table_free (void)
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{
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free (variant_table);
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variant_table = NULL;
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variant_table_size = variant_count = 0;
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}
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static char *
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find_prefix_end (const char *prefix, char *begin, char *end)
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{
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char *ptr = begin;
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for (; *prefix && ptr != end; ++prefix, ++ptr)
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if (*prefix != *ptr)
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return 0;
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if (*prefix)
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return 0;
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return ptr;
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}
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static variant *
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variant_add (uniqstr id, location id_loc, unsigned symbol_index,
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char *cp, char *cp_end, bool explicit_bracketing)
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{
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char *prefix_end;
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prefix_end = find_prefix_end (id, cp, cp_end);
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if (prefix_end &&
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(prefix_end == cp_end ||
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(!explicit_bracketing && is_dot_or_dash (*prefix_end))))
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{
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variant *r = variant_table_grow ();
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r->symbol_index = symbol_index;
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r->id = id;
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r->loc = id_loc;
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r->hidden_by = NULL;
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r->err = 0;
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return r;
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}
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else
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return NULL;
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}
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static const char *
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get_at_spec (unsigned symbol_index)
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{
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static char at_buf[20];
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if (symbol_index == 0)
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strcpy (at_buf, "$$");
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else
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snprintf (at_buf, sizeof at_buf, "$%u", symbol_index);
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return at_buf;
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}
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static void
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show_sub_messages (const char* cp, bool explicit_bracketing,
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int midrule_rhs_index, char dollar_or_at,
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bool is_warning, unsigned indent)
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{
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unsigned i;
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for (i = 0; i < variant_count; ++i)
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{
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const variant *var = &variant_table[i];
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const char *at_spec = get_at_spec (var->symbol_index);
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if (var->err == 0)
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{
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if (is_warning)
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warn_at_indent (var->loc, &indent, _("refers to: %c%s at %s"),
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dollar_or_at, var->id, at_spec);
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else
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complain_at_indent (var->loc, &indent, _("refers to: %c%s at %s"),
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dollar_or_at, var->id, at_spec);
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}
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else
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{
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static struct obstack msg_buf;
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const char *tail = explicit_bracketing ? "" :
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cp + strlen (var->id);
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const char *id = var->hidden_by ? var->hidden_by->id :
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var->id;
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location id_loc = var->hidden_by ? var->hidden_by->loc :
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var->loc;
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/* Create the explanation message. */
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obstack_init (&msg_buf);
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obstack_printf (&msg_buf, _("possibly meant: %c"), dollar_or_at);
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if (contains_dot_or_dash (id))
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obstack_printf (&msg_buf, "[%s]", id);
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else
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obstack_sgrow (&msg_buf, id);
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obstack_sgrow (&msg_buf, tail);
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if (var->err & VARIANT_HIDDEN)
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{
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obstack_printf (&msg_buf, _(", hiding %c"), dollar_or_at);
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if (contains_dot_or_dash (var->id))
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obstack_printf (&msg_buf, "[%s]", var->id);
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else
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obstack_sgrow (&msg_buf, var->id);
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obstack_sgrow (&msg_buf, tail);
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}
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obstack_printf (&msg_buf, _(" at %s"), at_spec);
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if (var->err & VARIANT_NOT_VISIBLE_FROM_MIDRULE)
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{
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const char *format =
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_(", cannot be accessed from mid-rule action at $%d");
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obstack_printf (&msg_buf, format, midrule_rhs_index);
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}
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obstack_1grow (&msg_buf, '\0');
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if (is_warning)
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warn_at_indent (id_loc, &indent, "%s",
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(char *) obstack_finish (&msg_buf));
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else
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complain_at_indent (id_loc, &indent, "%s",
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(char *) obstack_finish (&msg_buf));
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obstack_free (&msg_buf, 0);
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}
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}
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}
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/* Returned from "parse_ref" when the reference
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is inappropriate. */
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#define INVALID_REF (INT_MIN)
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/* Returned from "parse_ref" when the reference
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points to LHS ($$) of the current rule or midrule. */
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#define LHS_REF (INT_MIN + 1)
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/* Parse named or positional reference. In case of positional
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references, can return negative values for $-n "deep" stack
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accesses. */
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static long int
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parse_ref (char *cp, symbol_list *rule, int rule_length,
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int midrule_rhs_index, char *text, location text_loc,
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char dollar_or_at)
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{
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symbol_list *l;
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char *cp_end;
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bool explicit_bracketing;
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unsigned i;
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unsigned valid_variants = 0;
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unsigned valid_variant_index = 0;
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if ('$' == *cp)
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return LHS_REF;
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if (c_isdigit (*cp) || (*cp == '-' && c_isdigit (* (cp + 1))))
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{
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long int num = strtol (cp, &cp, 10);
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if (1 - INT_MAX + rule_length <= num && num <= rule_length)
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return num;
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else
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{
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complain_at (text_loc, _("integer out of range: %s"),
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quote (text));
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return INVALID_REF;
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}
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}
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if ('[' == *cp)
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{
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/* Ignore the brackets. */
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char *p;
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for (p = ++cp; *p != ']'; ++p)
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continue;
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cp_end = p;
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|
|
|
explicit_bracketing = true;
|
|
}
|
|
else
|
|
{
|
|
/* Take all characters of the name. */
|
|
char* p;
|
|
for (p = cp; *p; ++p)
|
|
if (is_dot_or_dash (*p))
|
|
{
|
|
ref_tail_fields = p;
|
|
break;
|
|
}
|
|
for (p = cp; *p; ++p)
|
|
continue;
|
|
cp_end = p;
|
|
|
|
explicit_bracketing = false;
|
|
}
|
|
|
|
/* Add all relevant variants. */
|
|
{
|
|
unsigned symbol_index;
|
|
variant_count = 0;
|
|
for (symbol_index = 0, l = rule; !symbol_list_null (l);
|
|
++symbol_index, l = l->next)
|
|
{
|
|
variant *var;
|
|
if (l->content_type != SYMLIST_SYMBOL)
|
|
continue;
|
|
|
|
var = variant_add (l->content.sym->tag, l->sym_loc,
|
|
symbol_index, cp, cp_end, explicit_bracketing);
|
|
if (var && l->named_ref)
|
|
var->hidden_by = l->named_ref;
|
|
|
|
if (l->named_ref)
|
|
variant_add (l->named_ref->id, l->named_ref->loc,
|
|
symbol_index, cp, cp_end, explicit_bracketing);
|
|
}
|
|
}
|
|
|
|
/* Check errors. */
|
|
for (i = 0; i < variant_count; ++i)
|
|
{
|
|
variant *var = &variant_table[i];
|
|
unsigned symbol_index = var->symbol_index;
|
|
|
|
/* Check visibility from mid-rule actions. */
|
|
if (midrule_rhs_index != 0
|
|
&& (symbol_index == 0 || midrule_rhs_index < symbol_index))
|
|
var->err |= VARIANT_NOT_VISIBLE_FROM_MIDRULE;
|
|
|
|
/* Check correct bracketing. */
|
|
if (!explicit_bracketing && contains_dot_or_dash (var->id))
|
|
var->err |= VARIANT_BAD_BRACKETING;
|
|
|
|
/* Check using of hidden symbols. */
|
|
if (var->hidden_by)
|
|
var->err |= VARIANT_HIDDEN;
|
|
|
|
if (!var->err)
|
|
{
|
|
valid_variant_index = i;
|
|
++valid_variants;
|
|
}
|
|
}
|
|
|
|
switch (valid_variants)
|
|
{
|
|
case 0:
|
|
{
|
|
unsigned len = (explicit_bracketing || !ref_tail_fields) ?
|
|
cp_end - cp : ref_tail_fields - cp;
|
|
unsigned indent = 0;
|
|
|
|
complain_at_indent (text_loc, &indent, _("invalid reference: %s"),
|
|
quote (text));
|
|
indent += SUB_INDENT;
|
|
if (len == 0)
|
|
{
|
|
location sym_loc = text_loc;
|
|
sym_loc.start.column += 1;
|
|
sym_loc.end = sym_loc.start;
|
|
const char *format =
|
|
_("syntax error after '%c', expecting integer, letter,"
|
|
" '_', '[', or '$'");
|
|
complain_at_indent (sym_loc, &indent, format, dollar_or_at);
|
|
}
|
|
else if (midrule_rhs_index)
|
|
{
|
|
const char *format =
|
|
_("symbol not found in production before $%d: %.*s");
|
|
complain_at_indent (rule->location, &indent, format,
|
|
midrule_rhs_index, len, cp);
|
|
}
|
|
else
|
|
{
|
|
const char *format =
|
|
_("symbol not found in production: %.*s");
|
|
complain_at_indent (rule->location, &indent, format,
|
|
len, cp);
|
|
}
|
|
|
|
if (variant_count > 0)
|
|
show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
|
|
dollar_or_at, false, indent);
|
|
return INVALID_REF;
|
|
}
|
|
case 1:
|
|
{
|
|
unsigned indent = 0;
|
|
if (variant_count > 1)
|
|
{
|
|
warn_at_indent (text_loc, &indent, _("misleading reference: %s"),
|
|
quote (text));
|
|
show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
|
|
dollar_or_at, true, indent + SUB_INDENT);
|
|
}
|
|
{
|
|
unsigned symbol_index =
|
|
variant_table[valid_variant_index].symbol_index;
|
|
return (symbol_index == midrule_rhs_index) ? LHS_REF : symbol_index;
|
|
}
|
|
}
|
|
case 2:
|
|
default:
|
|
{
|
|
unsigned indent = 0;
|
|
complain_at_indent (text_loc, &indent, _("ambiguous reference: %s"),
|
|
quote (text));
|
|
show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
|
|
dollar_or_at, false, indent + SUB_INDENT);
|
|
return INVALID_REF;
|
|
}
|
|
}
|
|
|
|
/* Not reachable. */
|
|
return INVALID_REF;
|
|
}
|
|
|
|
/* Keeps track of the maximum number of semantic values to the left of
|
|
a handle (those referenced by $0, $-1, etc.) are required by the
|
|
semantic actions of this grammar. */
|
|
int max_left_semantic_context = 0;
|
|
|
|
|
|
/* If CP points to a typename (i.e., <.*?>), set TYPE_NAME to its
|
|
beginning (i.e., after the opening "<", and return the pointer
|
|
immediately after it. */
|
|
|
|
static
|
|
char *
|
|
fetch_type_name (char *cp, char const **type_name,
|
|
location dollar_loc)
|
|
{
|
|
if (*cp == '<')
|
|
{
|
|
*type_name = ++cp;
|
|
while (*cp != '>')
|
|
++cp;
|
|
|
|
/* The '>' symbol will be later replaced by '\0'. Original
|
|
'text' is needed for error messages. */
|
|
++cp;
|
|
if (untyped_var_seen)
|
|
complain_at (dollar_loc, _("explicit type given in untyped grammar"));
|
|
tag_seen = true;
|
|
}
|
|
return cp;
|
|
}
|
|
|
|
/*------------------------------------------------------------------.
|
|
| TEXT is pointing to a wannabee semantic value (i.e., a '$'). |
|
|
| |
|
|
| Possible inputs: $[<TYPENAME>]($|integer) |
|
|
| |
|
|
| Output to OBSTACK_FOR_STRING a reference to this semantic value. |
|
|
`------------------------------------------------------------------*/
|
|
|
|
static void
|
|
handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
|
|
{
|
|
char const *type_name = NULL;
|
|
char *cp = text + 1;
|
|
symbol_list *effective_rule;
|
|
int effective_rule_length;
|
|
int n;
|
|
|
|
if (rule->midrule_parent_rule)
|
|
{
|
|
effective_rule = rule->midrule_parent_rule;
|
|
effective_rule_length = rule->midrule_parent_rhs_index - 1;
|
|
}
|
|
else
|
|
{
|
|
effective_rule = rule;
|
|
effective_rule_length = symbol_list_length (rule->next);
|
|
}
|
|
|
|
/* Get the type name if explicit. */
|
|
cp = fetch_type_name (cp, &type_name, dollar_loc);
|
|
|
|
n = parse_ref (cp, effective_rule, effective_rule_length,
|
|
rule->midrule_parent_rhs_index, text, dollar_loc, '$');
|
|
|
|
/* End type_name. */
|
|
if (type_name)
|
|
cp[-1] = '\0';
|
|
|
|
switch (n)
|
|
{
|
|
case INVALID_REF:
|
|
break;
|
|
|
|
case LHS_REF:
|
|
if (!type_name)
|
|
type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0);
|
|
|
|
if (!type_name)
|
|
{
|
|
if (union_seen | tag_seen)
|
|
{
|
|
if (rule->midrule_parent_rule)
|
|
complain_at (dollar_loc,
|
|
_("$$ for the midrule at $%d of %s"
|
|
" has no declared type"),
|
|
rule->midrule_parent_rhs_index,
|
|
quote (effective_rule->content.sym->tag));
|
|
else
|
|
complain_at (dollar_loc, _("$$ of %s has no declared type"),
|
|
quote (rule->content.sym->tag));
|
|
}
|
|
else
|
|
untyped_var_seen = true;
|
|
}
|
|
|
|
obstack_sgrow (&obstack_for_string, "]b4_lhs_value(");
|
|
obstack_quote (&obstack_for_string, type_name);
|
|
obstack_sgrow (&obstack_for_string, ")[");
|
|
rule->action_props.is_value_used = true;
|
|
break;
|
|
|
|
default:
|
|
if (max_left_semantic_context < 1 - n)
|
|
max_left_semantic_context = 1 - n;
|
|
if (!type_name && 0 < n)
|
|
type_name =
|
|
symbol_list_n_type_name_get (effective_rule, dollar_loc, n);
|
|
if (!type_name)
|
|
{
|
|
if (union_seen | tag_seen)
|
|
complain_at (dollar_loc, _("$%s of %s has no declared type"),
|
|
cp, quote (effective_rule->content.sym->tag));
|
|
else
|
|
untyped_var_seen = true;
|
|
}
|
|
|
|
obstack_printf (&obstack_for_string,
|
|
"]b4_rhs_value(%d, %d, ", effective_rule_length, n);
|
|
obstack_quote (&obstack_for_string, type_name);
|
|
obstack_sgrow (&obstack_for_string, ")[");
|
|
if (n > 0)
|
|
symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
|
|
true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*------------------------------------------------------.
|
|
| TEXT is a location token (i.e., a '@...'). Output to |
|
|
| OBSTACK_FOR_STRING a reference to this location. |
|
|
`------------------------------------------------------*/
|
|
|
|
static void
|
|
handle_action_at (symbol_list *rule, char *text, location at_loc)
|
|
{
|
|
char *cp = text + 1;
|
|
symbol_list *effective_rule;
|
|
int effective_rule_length;
|
|
int n;
|
|
|
|
if (rule->midrule_parent_rule)
|
|
{
|
|
effective_rule = rule->midrule_parent_rule;
|
|
effective_rule_length = rule->midrule_parent_rhs_index - 1;
|
|
}
|
|
else
|
|
{
|
|
effective_rule = rule;
|
|
effective_rule_length = symbol_list_length (rule->next);
|
|
}
|
|
|
|
locations_flag = true;
|
|
|
|
n = parse_ref (cp, effective_rule, effective_rule_length,
|
|
rule->midrule_parent_rhs_index, text, at_loc, '@');
|
|
switch (n)
|
|
{
|
|
case INVALID_REF:
|
|
break;
|
|
|
|
case LHS_REF:
|
|
obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
|
|
break;
|
|
|
|
default:
|
|
obstack_printf (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
|
|
effective_rule_length, n);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*-------------------------.
|
|
| Initialize the scanner. |
|
|
`-------------------------*/
|
|
|
|
/* Translate the dollars and ats in \a self, in the context \a sc_context
|
|
(SC_RULE_ACTION, SC_SYMBOL_ACTION, INITIAL). */
|
|
|
|
static char const *
|
|
translate_action (code_props *self, int sc_context)
|
|
{
|
|
char *res;
|
|
static bool initialized = false;
|
|
if (!initialized)
|
|
{
|
|
obstack_init (&obstack_for_string);
|
|
yy_flex_debug = 0;
|
|
initialized = true;
|
|
}
|
|
|
|
loc->start = loc->end = self->location.start;
|
|
yy_switch_to_buffer (yy_scan_string (self->code));
|
|
res = code_lex (self, sc_context);
|
|
yy_delete_buffer (YY_CURRENT_BUFFER);
|
|
|
|
return res;
|
|
}
|
|
|
|
/*------------------------------------------------------------------------.
|
|
| Implementation of the public interface as documented in "scan-code.h". |
|
|
`------------------------------------------------------------------------*/
|
|
|
|
void
|
|
code_props_none_init (code_props *self)
|
|
{
|
|
*self = code_props_none;
|
|
}
|
|
|
|
code_props const code_props_none = CODE_PROPS_NONE_INIT;
|
|
|
|
void
|
|
code_props_plain_init (code_props *self, char const *code,
|
|
location code_loc)
|
|
{
|
|
self->kind = CODE_PROPS_PLAIN;
|
|
self->code = code;
|
|
self->location = code_loc;
|
|
self->is_value_used = false;
|
|
self->rule = NULL;
|
|
self->named_ref = NULL;
|
|
}
|
|
|
|
void
|
|
code_props_symbol_action_init (code_props *self, char const *code,
|
|
location code_loc)
|
|
{
|
|
self->kind = CODE_PROPS_SYMBOL_ACTION;
|
|
self->code = code;
|
|
self->location = code_loc;
|
|
self->is_value_used = false;
|
|
self->rule = NULL;
|
|
self->named_ref = NULL;
|
|
}
|
|
|
|
void
|
|
code_props_rule_action_init (code_props *self, char const *code,
|
|
location code_loc, symbol_list *rule,
|
|
named_ref *name)
|
|
{
|
|
self->kind = CODE_PROPS_RULE_ACTION;
|
|
self->code = code;
|
|
self->location = code_loc;
|
|
self->is_value_used = false;
|
|
self->rule = rule;
|
|
self->named_ref = name;
|
|
}
|
|
|
|
void
|
|
code_props_translate_code (code_props *self)
|
|
{
|
|
switch (self->kind)
|
|
{
|
|
case CODE_PROPS_NONE:
|
|
break;
|
|
case CODE_PROPS_PLAIN:
|
|
self->code = translate_action (self, INITIAL);
|
|
break;
|
|
case CODE_PROPS_SYMBOL_ACTION:
|
|
self->code = translate_action (self, SC_SYMBOL_ACTION);
|
|
break;
|
|
case CODE_PROPS_RULE_ACTION:
|
|
self->code = translate_action (self, SC_RULE_ACTION);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
code_scanner_last_string_free (void)
|
|
{
|
|
STRING_FREE;
|
|
}
|
|
|
|
void
|
|
code_scanner_free (void)
|
|
{
|
|
obstack_free (&obstack_for_string, 0);
|
|
variant_table_free ();
|
|
|
|
/* Reclaim Flex's buffers. */
|
|
yylex_destroy ();
|
|
}
|