You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
896 lines
29 KiB
896 lines
29 KiB
# D skeleton for Bison -*- autoconf -*-
|
|
|
|
# Copyright (C) 2007-2012, 2019 Free Software Foundation, Inc.
|
|
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
m4_include(b4_skeletonsdir/[d.m4])
|
|
|
|
|
|
b4_output_begin([b4_parser_file_name])
|
|
b4_copyright([Skeleton implementation for Bison LALR(1) parsers in D],
|
|
[2007-2012, 2019])[
|
|
|
|
]b4_percent_define_ifdef([package], [module b4_percent_define_get([package]);
|
|
])[
|
|
version(D_Version2) {
|
|
} else {
|
|
static assert(false, "need compiler for D Version 2");
|
|
}
|
|
|
|
]b4_user_pre_prologue[
|
|
]b4_user_post_prologue[
|
|
]b4_percent_code_get([[imports]])[
|
|
import std.format;
|
|
|
|
/**
|
|
* A Bison parser, automatically generated from <tt>]m4_bpatsubst(b4_file_name, [^"\(.*\)"$], [\1])[</tt>.
|
|
*
|
|
* @@author LALR (1) parser skeleton written by Paolo Bonzini.
|
|
* Port to D language was done by Oliver Mangold.
|
|
*/
|
|
|
|
/**
|
|
* Communication interface between the scanner and the Bison-generated
|
|
* parser <tt>]b4_parser_class[</tt>.
|
|
*/
|
|
public interface Lexer
|
|
{]b4_locations_if([[
|
|
/**
|
|
* Method to retrieve the beginning position of the last scanned token.
|
|
* @@return the position at which the last scanned token starts. */
|
|
@@property ]b4_position_type[ startPos ();
|
|
|
|
/**
|
|
* Method to retrieve the ending position of the last scanned token.
|
|
* @@return the first position beyond the last scanned token. */
|
|
@@property ]b4_position_type[ endPos ();
|
|
|
|
]])[
|
|
/**
|
|
* Method to retrieve the semantic value of the last scanned token.
|
|
* @@return the semantic value of the last scanned token. */
|
|
@@property ]b4_yystype[ semanticVal ();
|
|
|
|
/**
|
|
* Entry point for the scanner. Returns the token identifier corresponding
|
|
* to the next token and prepares to return the semantic value
|
|
* ]b4_locations_if([and beginning/ending positions ])[of the token.
|
|
* @@return the token identifier corresponding to the next token. */
|
|
int yylex ();
|
|
|
|
/**
|
|
* Entry point for error reporting. Emits an error
|
|
* ]b4_locations_if([referring to the given location ])[in a user-defined way.
|
|
*]b4_locations_if([[
|
|
* @@param loc The location of the element to which the
|
|
* error message is related]])[
|
|
* @@param s The string for the error message. */
|
|
void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[string s);
|
|
}
|
|
|
|
]b4_locations_if([b4_position_type_if([[
|
|
static assert(__traits(compiles,
|
|
(new ]b4_position_type[[1])[0]=(new ]b4_position_type[[1])[0]),
|
|
"struct/class ]b4_position_type[ must be default-constructible "
|
|
"and assignable");
|
|
static assert(__traits(compiles, (new string[1])[0]=(new ]b4_position_type[).toString()),
|
|
"error: struct/class ]b4_position_type[ must have toString method");
|
|
]], [[
|
|
/**
|
|
* A struct denoting a point in the input.*/
|
|
public struct ]b4_position_type[ {
|
|
|
|
/** The column index within the line of input. */
|
|
public int column = 1;
|
|
/** The line number within an input file. */
|
|
public int line = 1;
|
|
/** The name of the input file. */
|
|
public string filename = null;
|
|
|
|
/**
|
|
* A string representation of the position. */
|
|
public string toString() const {
|
|
if (filename)
|
|
return format("%s:%d.%d", filename, line, column);
|
|
else
|
|
return format("%d.%d", line, column);
|
|
}
|
|
}
|
|
]])b4_location_type_if([[
|
|
static assert(__traits(compiles, (new ]b4_location_type[((new ]b4_position_type[[1])[0]))) &&
|
|
__traits(compiles, (new ]b4_location_type[((new ]b4_position_type[[1])[0], (new ]b4_position_type[[1])[0]))),
|
|
"error: struct/class ]b4_location_type[ must have "
|
|
"default constructor and constructors this(]b4_position_type[) and this(]b4_position_type[, ]b4_position_type[).");
|
|
static assert(__traits(compiles, (new ]b4_location_type[[1])[0].begin=(new ]b4_location_type[[1])[0].begin) &&
|
|
__traits(compiles, (new ]b4_location_type[[1])[0].begin=(new ]b4_location_type[[1])[0].end) &&
|
|
__traits(compiles, (new ]b4_location_type[[1])[0].end=(new ]b4_location_type[[1])[0].begin) &&
|
|
__traits(compiles, (new ]b4_location_type[[1])[0].end=(new ]b4_location_type[[1])[0].end),
|
|
"error: struct/class ]b4_location_type[ must have assignment-compatible "
|
|
"members/properties 'begin' and 'end'.");
|
|
static assert(__traits(compiles, (new string[1])[0]=(new ]b4_location_type[[1])[0].toString()),
|
|
"error: struct/class ]b4_location_type[ must have toString method.");
|
|
|
|
private immutable bool yy_location_is_class = !__traits(compiles, *(new ]b4_location_type[((new ]b4_position_type[[1])[0])));]], [[
|
|
/**
|
|
* A class defining a pair of positions. Positions, defined by the
|
|
* <code>]b4_position_type[</code> class, denote a point in the input.
|
|
* Locations represent a part of the input through the beginning
|
|
* and ending positions. */
|
|
public class ]b4_location_type[
|
|
{
|
|
/** The first, inclusive, position in the range. */
|
|
public ]b4_position_type[ begin;
|
|
|
|
/** The first position beyond the range. */
|
|
public ]b4_position_type[ end;
|
|
|
|
/**
|
|
* Create a <code>]b4_location_type[</code> denoting an empty range located at
|
|
* a given point.
|
|
* @@param loc The position at which the range is anchored. */
|
|
public this (]b4_position_type[ loc) {
|
|
this.begin = this.end = loc;
|
|
}
|
|
|
|
public this () {
|
|
}
|
|
|
|
/**
|
|
* Create a <code>]b4_location_type[</code> from the endpoints of the range.
|
|
* @@param begin The first position included in the range.
|
|
* @@param end The first position beyond the range. */
|
|
public this (]b4_position_type[ begin, ]b4_position_type[ end)
|
|
{
|
|
this.begin = begin;
|
|
this.end = end;
|
|
}
|
|
|
|
/**
|
|
* A representation of the location. For this to be correct,
|
|
* <code>]b4_position_type[</code> should override the <code>toString</code>
|
|
* method. */
|
|
public override string toString () const {
|
|
auto end_col = 0 < end.column ? end.column - 1 : 0;
|
|
auto res = begin.toString ();
|
|
if (end.filename && begin.filename != end.filename)
|
|
res ~= "-" ~ format("%s:%d.%d", end.filename, end.line, end_col);
|
|
else if (begin.line < end.line)
|
|
res ~= "-" ~ format("%d.%d", end.line, end_col);
|
|
else if (begin.column < end_col)
|
|
res ~= "-" ~ format("%d", end_col);
|
|
return res;
|
|
}
|
|
}
|
|
|
|
private immutable bool yy_location_is_class = true;
|
|
|
|
]])])m4_ifdef([b4_user_union_members], [private union YYSemanticType
|
|
{
|
|
b4_user_union_members
|
|
};],
|
|
[m4_if(b4_tag_seen_flag, 0,
|
|
[[private alias int YYSemanticType;]])])[
|
|
]b4_token_enums(b4_tokens)[
|
|
]b4_parser_class_declaration[
|
|
{
|
|
]b4_identification[
|
|
|
|
]b4_locations_if([[
|
|
private final ]b4_location_type[ yylloc_from_stack (ref YYStack rhs, int n)
|
|
{
|
|
static if (yy_location_is_class) {
|
|
if (n > 0)
|
|
return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
|
|
else
|
|
return new ]b4_location_type[ (rhs.locationAt (0).end);
|
|
} else {
|
|
if (n > 0)
|
|
return ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
|
|
else
|
|
return ]b4_location_type[ (rhs.locationAt (0).end);
|
|
}
|
|
}]])[
|
|
|
|
]b4_lexer_if([[ private class YYLexer implements Lexer {
|
|
]b4_percent_code_get([[lexer]])[
|
|
}
|
|
]])[
|
|
/** The object doing lexical analysis for us. */
|
|
private Lexer yylexer;
|
|
|
|
]b4_parse_param_vars[
|
|
|
|
]b4_lexer_if([[
|
|
/**
|
|
* Instantiate the Bison-generated parser.
|
|
*/
|
|
public this] (b4_parse_param_decl([b4_lex_param_decl])[) {
|
|
this (new YYLexer(]b4_lex_param_call[));
|
|
}
|
|
]])[
|
|
|
|
/**
|
|
* Instantiate the Bison-generated parser.
|
|
* @@param yylexer The scanner that will supply tokens to the parser.
|
|
*/
|
|
]b4_lexer_if([[protected]], [[public]]) [this (]b4_parse_param_decl([[Lexer yylexer]])[) {
|
|
this.yylexer = yylexer;]b4_parse_trace_if([[
|
|
this.yyDebugStream = stderr;]])[
|
|
]b4_parse_param_cons[
|
|
}
|
|
]b4_parse_trace_if([[
|
|
private File yyDebugStream;
|
|
|
|
/**
|
|
* The <tt>File</tt> on which the debugging output is
|
|
* printed.
|
|
*/
|
|
public File getDebugStream () { return yyDebugStream; }
|
|
|
|
/**
|
|
* Set the <tt>std.File</tt> on which the debug output is printed.
|
|
* @@param s The stream that is used for debugging output.
|
|
*/
|
|
public final void setDebugStream(File s) { yyDebugStream = s; }
|
|
|
|
private int yydebug = 0;
|
|
|
|
/**
|
|
* Answer the verbosity of the debugging output; 0 means that all kinds of
|
|
* output from the parser are suppressed.
|
|
*/
|
|
public final int getDebugLevel() { return yydebug; }
|
|
|
|
/**
|
|
* Set the verbosity of the debugging output; 0 means that all kinds of
|
|
* output from the parser are suppressed.
|
|
* @@param level The verbosity level for debugging output.
|
|
*/
|
|
public final void setDebugLevel(int level) { yydebug = level; }
|
|
|
|
protected final void yycdebug (string s) {
|
|
if (0 < yydebug)
|
|
yyDebugStream.writeln (s);
|
|
}
|
|
]])[
|
|
private final int yylex () {
|
|
return yylexer.yylex ();
|
|
}
|
|
|
|
protected final void yyerror (]b4_locations_if(ref [b4_location_type[ loc, ]])[string s) {
|
|
yylexer.yyerror (]b4_locations_if([loc, ])[s);
|
|
}
|
|
|
|
/**
|
|
* Returned by a Bison action in order to stop the parsing process and
|
|
* return success (<tt>true</tt>). */
|
|
public static immutable int YYACCEPT = 0;
|
|
|
|
/**
|
|
* Returned by a Bison action in order to stop the parsing process and
|
|
* return failure (<tt>false</tt>). */
|
|
public static immutable int YYABORT = 1;
|
|
|
|
/**
|
|
* Returned by a Bison action in order to start error recovery without
|
|
* printing an error message. */
|
|
public static immutable int YYERROR = 2;
|
|
|
|
// Internal return codes that are not supported for user semantic
|
|
// actions.
|
|
private static immutable int YYERRLAB = 3;
|
|
private static immutable int YYNEWSTATE = 4;
|
|
private static immutable int YYDEFAULT = 5;
|
|
private static immutable int YYREDUCE = 6;
|
|
private static immutable int YYERRLAB1 = 7;
|
|
private static immutable int YYRETURN = 8;
|
|
]b4_locations_if([
|
|
private static immutable YYSemanticType yy_semantic_null;])[
|
|
private int yyerrstatus_ = 0;
|
|
|
|
/**
|
|
* Whether error recovery is being done. In this state, the parser
|
|
* reads token until it reaches a known state, and then restarts normal
|
|
* operation. */
|
|
public final bool recovering ()
|
|
{
|
|
return yyerrstatus_ == 0;
|
|
}
|
|
|
|
private int yyaction (int yyn, ref YYStack yystack, int yylen)
|
|
{
|
|
]b4_yystype[ yyval;]b4_locations_if([[
|
|
]b4_location_type[ yyloc = yylloc_from_stack (yystack, yylen);]])[
|
|
|
|
/* If YYLEN is nonzero, implement the default value of the action:
|
|
`$$ = $1'. Otherwise, use the top of the stack.
|
|
|
|
Otherwise, the following line sets YYVAL to garbage.
|
|
This behavior is undocumented and Bison
|
|
users should not rely upon it. */
|
|
if (yylen > 0)
|
|
yyval = yystack.valueAt (yylen - 1);
|
|
else
|
|
yyval = yystack.valueAt (0);
|
|
|
|
]b4_parse_trace_if([[
|
|
yy_reduce_print (yyn, yystack);]])[
|
|
|
|
switch (yyn)
|
|
{
|
|
]b4_user_actions[
|
|
default: break;
|
|
}
|
|
|
|
]b4_parse_trace_if([[
|
|
yy_symbol_print ("-> $$ =", yyr1_[yyn], yyval]b4_locations_if([, yyloc])[);]])[
|
|
|
|
yystack.pop (yylen);
|
|
yylen = 0;
|
|
|
|
/* Shift the result of the reduction. */
|
|
yyn = yyr1_[yyn];
|
|
int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0);
|
|
if (0 <= yystate && yystate <= yylast_
|
|
&& yycheck_[yystate] == yystack.stateAt (0))
|
|
yystate = yytable_[yystate];
|
|
else
|
|
yystate = yydefgoto_[yyn - yyntokens_];
|
|
|
|
yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
|
|
return YYNEWSTATE;
|
|
}
|
|
|
|
/* Return YYSTR after stripping away unnecessary quotes and
|
|
backslashes, so that it's suitable for yyerror. The heuristic is
|
|
that double-quoting is unnecessary unless the string contains an
|
|
apostrophe, a comma, or backslash (other than backslash-backslash).
|
|
YYSTR is taken from yytname. */
|
|
private final string yytnamerr_ (string yystr)
|
|
{
|
|
if (yystr[0] == '"')
|
|
{
|
|
string yyr;
|
|
strip_quotes:
|
|
for (int i = 1; i < yystr.length; i++)
|
|
switch (yystr[i])
|
|
{
|
|
case '\'':
|
|
case ',':
|
|
break strip_quotes;
|
|
|
|
case '\\':
|
|
if (yystr[++i] != '\\')
|
|
break strip_quotes;
|
|
goto default;
|
|
default:
|
|
yyr ~= yystr[i];
|
|
break;
|
|
|
|
case '"':
|
|
return yyr;
|
|
}
|
|
}
|
|
else if (yystr == "$end")
|
|
return "end of input";
|
|
|
|
return yystr;
|
|
}
|
|
]b4_parse_trace_if([[
|
|
/*--------------------------------.
|
|
| Print this symbol on YYOUTPUT. |
|
|
`--------------------------------*/
|
|
|
|
private final void yy_symbol_print (string s, int yytype,
|
|
ref ]b4_yystype[ yyvaluep]dnl
|
|
b4_locations_if([, ref ]b4_location_type[ yylocationp])[)
|
|
{
|
|
if (0 < yydebug)
|
|
{
|
|
string message = s ~ (yytype < yyntokens_ ? " token " : " nterm ")
|
|
~ yytname_[yytype] ~ " ("]b4_locations_if([
|
|
~ yylocationp.toString() ~ ": "])[;
|
|
static if (__traits(compiles, message ~= yyvaluep.toString ()))
|
|
message ~= yyvaluep.toString ();
|
|
else
|
|
message ~= format ("%s", &yyvaluep);
|
|
message ~= ")";
|
|
yycdebug (message);
|
|
}
|
|
}
|
|
]])[
|
|
/**
|
|
* Parse input from the scanner that was specified at object construction
|
|
* time. Return whether the end of the input was reached successfully.
|
|
*
|
|
* @@return <tt>true</tt> if the parsing succeeds. Note that this does not
|
|
* imply that there were no syntax errors.
|
|
*/
|
|
public bool parse ()
|
|
{
|
|
/// Lookahead and lookahead in internal form.
|
|
int yychar = yyempty_;
|
|
int yytoken = 0;
|
|
|
|
/* State. */
|
|
int yyn = 0;
|
|
int yylen = 0;
|
|
int yystate = 0;
|
|
|
|
YYStack yystack;
|
|
|
|
/* Error handling. */
|
|
int yynerrs_ = 0;]b4_locations_if([[
|
|
/// The location where the error started.
|
|
]b4_location_type[ yyerrloc = null;
|
|
|
|
/// ]b4_location_type[ of the lookahead.
|
|
]b4_location_type[ yylloc;
|
|
|
|
/// @@$.
|
|
]b4_location_type[ yyloc;]])[
|
|
|
|
/// Semantic value of the lookahead.
|
|
]b4_yystype[ yylval;
|
|
|
|
int yyresult;]b4_parse_trace_if([[
|
|
|
|
yycdebug ("Starting parse\n");]])[
|
|
yyerrstatus_ = 0;
|
|
|
|
]m4_ifdef([b4_initial_action], [
|
|
m4_pushdef([b4_at_dollar], [yylloc])dnl
|
|
m4_pushdef([b4_dollar_dollar], [yylval])dnl
|
|
/* User initialization code. */
|
|
b4_user_initial_action
|
|
m4_popdef([b4_dollar_dollar])dnl
|
|
m4_popdef([b4_at_dollar])])dnl
|
|
|
|
[ /* Initialize the stack. */
|
|
yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
|
|
|
|
int label = YYNEWSTATE;
|
|
for (;;)
|
|
final switch (label)
|
|
{
|
|
/* New state. Unlike in the C/C++ skeletons, the state is already
|
|
pushed when we come here. */
|
|
case YYNEWSTATE:]b4_parse_trace_if([[
|
|
yycdebug (format("Entering state %d\n", yystate));
|
|
if (0 < yydebug)
|
|
yystack.print (yyDebugStream);]])[
|
|
|
|
/* Accept? */
|
|
if (yystate == yyfinal_)
|
|
return true;
|
|
|
|
/* Take a decision. First try without lookahead. */
|
|
yyn = yypact_[yystate];
|
|
if (yy_pact_value_is_default_ (yyn))
|
|
{
|
|
label = YYDEFAULT;
|
|
break;
|
|
}
|
|
|
|
/* Read a lookahead token. */
|
|
if (yychar == yyempty_)
|
|
{]b4_parse_trace_if([[
|
|
yycdebug ("Reading a token: ");]])[
|
|
yychar = yylex ();]b4_locations_if([[
|
|
static if (yy_location_is_class) {
|
|
yylloc = new ]b4_location_type[(yylexer.startPos, yylexer.endPos);
|
|
} else {
|
|
yylloc = ]b4_location_type[(yylexer.startPos, yylexer.endPos);
|
|
}]])
|
|
yylval = yylexer.semanticVal;[
|
|
}
|
|
|
|
/* Convert token to internal form. */
|
|
yytoken = yytranslate_ (yychar);]b4_parse_trace_if([[
|
|
yy_symbol_print ("Next token is",
|
|
yytoken, yylval]b4_locations_if([, yylloc])[);]])[
|
|
|
|
/* If the proper action on seeing token YYTOKEN is to reduce or to
|
|
detect an error, take that action. */
|
|
yyn += yytoken;
|
|
if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken)
|
|
label = YYDEFAULT;
|
|
|
|
/* <= 0 means reduce or error. */
|
|
else if ((yyn = yytable_[yyn]) <= 0)
|
|
{
|
|
if (yy_table_value_is_error_ (yyn))
|
|
label = YYERRLAB;
|
|
else
|
|
{
|
|
yyn = -yyn;
|
|
label = YYREDUCE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Shift the lookahead token. */]b4_parse_trace_if([[
|
|
yy_symbol_print ("Shifting", yytoken,
|
|
yylval]b4_locations_if([, yylloc])[);]])[
|
|
|
|
/* Discard the token being shifted. */
|
|
yychar = yyempty_;
|
|
|
|
/* Count tokens shifted since error; after three, turn off error
|
|
* status. */
|
|
if (yyerrstatus_ > 0)
|
|
--yyerrstatus_;
|
|
|
|
yystate = yyn;
|
|
yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
|
|
label = YYNEWSTATE;
|
|
}
|
|
break;
|
|
|
|
/*-----------------------------------------------------------.
|
|
| yydefault -- do the default action for the current state. |
|
|
`-----------------------------------------------------------*/
|
|
case YYDEFAULT:
|
|
yyn = yydefact_[yystate];
|
|
if (yyn == 0)
|
|
label = YYERRLAB;
|
|
else
|
|
label = YYREDUCE;
|
|
break;
|
|
|
|
/*-----------------------------.
|
|
| yyreduce -- Do a reduction. |
|
|
`-----------------------------*/
|
|
case YYREDUCE:
|
|
yylen = yyr2_[yyn];
|
|
label = yyaction (yyn, yystack, yylen);
|
|
yystate = yystack.stateAt (0);
|
|
break;
|
|
|
|
/*------------------------------------.
|
|
| yyerrlab -- here on detecting error |
|
|
`------------------------------------*/
|
|
case YYERRLAB:
|
|
/* If not already recovering from an error, report this error. */
|
|
if (yyerrstatus_ == 0)
|
|
{
|
|
++yynerrs_;
|
|
if (yychar == yyempty_)
|
|
yytoken = yyempty_;
|
|
yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
|
|
}
|
|
|
|
]b4_locations_if([ yyerrloc = yylloc;])[
|
|
if (yyerrstatus_ == 3)
|
|
{
|
|
/* If just tried and failed to reuse lookahead token after an
|
|
* error, discard it. */
|
|
|
|
if (yychar <= YYTokenType.EOF)
|
|
{
|
|
/* Return failure if at end of input. */
|
|
if (yychar == YYTokenType.EOF)
|
|
return false;
|
|
}
|
|
else
|
|
yychar = yyempty_;
|
|
}
|
|
|
|
/* Else will try to reuse lookahead token after shifting the error
|
|
* token. */
|
|
label = YYERRLAB1;
|
|
break;
|
|
|
|
/*-------------------------------------------------.
|
|
| errorlab -- error raised explicitly by YYERROR. |
|
|
`-------------------------------------------------*/
|
|
case YYERROR:]b4_locations_if([
|
|
yyerrloc = yystack.locationAt (yylen - 1);])[
|
|
/* Do not reclaim the symbols of the rule which action triggered
|
|
this YYERROR. */
|
|
yystack.pop (yylen);
|
|
yylen = 0;
|
|
yystate = yystack.stateAt (0);
|
|
label = YYERRLAB1;
|
|
break;
|
|
|
|
/*-------------------------------------------------------------.
|
|
| yyerrlab1 -- common code for both syntax error and YYERROR. |
|
|
`-------------------------------------------------------------*/
|
|
case YYERRLAB1:
|
|
yyerrstatus_ = 3; /* Each real token shifted decrements this. */
|
|
|
|
for (;;)
|
|
{
|
|
yyn = yypact_[yystate];
|
|
if (!yy_pact_value_is_default_ (yyn))
|
|
{
|
|
yyn += yy_error_token_;
|
|
if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yy_error_token_)
|
|
{
|
|
yyn = yytable_[yyn];
|
|
if (0 < yyn)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Pop the current state because it cannot handle the error token. */
|
|
if (yystack.height == 1)
|
|
return false;
|
|
|
|
]b4_locations_if([ yyerrloc = yystack.locationAt (0);])[
|
|
yystack.pop ();
|
|
yystate = yystack.stateAt (0);]b4_parse_trace_if([[
|
|
if (0 < yydebug)
|
|
yystack.print (yyDebugStream);]])[
|
|
}
|
|
|
|
]b4_locations_if([
|
|
/* Muck with the stack to setup for yylloc. */
|
|
yystack.push (0, yy_semantic_null, yylloc);
|
|
yystack.push (0, yy_semantic_null, yyerrloc);
|
|
yyloc = yylloc_from_stack (yystack, 2);
|
|
yystack.pop (2);])[
|
|
|
|
/* Shift the error token. */]b4_parse_trace_if([[
|
|
yy_symbol_print ("Shifting", yystos_[yyn],
|
|
yylval]b4_locations_if([, yyloc])[);]])[
|
|
|
|
yystate = yyn;
|
|
yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
|
|
label = YYNEWSTATE;
|
|
break;
|
|
|
|
/* Accept. */
|
|
case YYACCEPT:
|
|
return true;
|
|
|
|
/* Abort. */
|
|
case YYABORT:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Generate an error message.
|
|
private final string yysyntax_error (int yystate, int tok)
|
|
{]b4_error_verbose_if([[
|
|
/* There are many possibilities here to consider:
|
|
- Assume YYFAIL is not used. It's too flawed to consider.
|
|
See
|
|
<http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
|
|
for details. YYERROR is fine as it does not invoke this
|
|
function.
|
|
- If this state is a consistent state with a default action,
|
|
then the only way this function was invoked is if the
|
|
default action is an error action. In that case, don't
|
|
check for expected tokens because there are none.
|
|
- The only way there can be no lookahead present (in tok) is
|
|
if this state is a consistent state with a default action.
|
|
Thus, detecting the absence of a lookahead is sufficient to
|
|
determine that there is no unexpected or expected token to
|
|
report. In that case, just report a simple "syntax error".
|
|
- Don't assume there isn't a lookahead just because this
|
|
state is a consistent state with a default action. There
|
|
might have been a previous inconsistent state, consistent
|
|
state with a non-default action, or user semantic action
|
|
that manipulated yychar. (However, yychar is currently out
|
|
of scope during semantic actions.)
|
|
- Of course, the expected token list depends on states to
|
|
have correct lookahead information, and it depends on the
|
|
parser not to perform extra reductions after fetching a
|
|
lookahead from the scanner and before detecting a syntax
|
|
error. Thus, state merging (from LALR or IELR) and default
|
|
reductions corrupt the expected token list. However, the
|
|
list is correct for canonical LR with one exception: it
|
|
will still contain any token that will not be accepted due
|
|
to an error action in a later state.
|
|
*/
|
|
if (tok != yyempty_)
|
|
{
|
|
// FIXME: This method of building the message is not compatible
|
|
// with internationalization.
|
|
string res = "syntax error, unexpected ";
|
|
res ~= yytnamerr_ (yytname_[tok]);
|
|
int yyn = yypact_[yystate];
|
|
if (!yy_pact_value_is_default_ (yyn))
|
|
{
|
|
/* Start YYX at -YYN if negative to avoid negative
|
|
indexes in YYCHECK. In other words, skip the first
|
|
-YYN actions for this state because they are default
|
|
actions. */
|
|
int yyxbegin = yyn < 0 ? -yyn : 0;
|
|
/* Stay within bounds of both yycheck and yytname. */
|
|
int yychecklim = yylast_ - yyn + 1;
|
|
int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
|
|
int count = 0;
|
|
for (int x = yyxbegin; x < yyxend; ++x)
|
|
if (yycheck_[x + yyn] == x && x != yy_error_token_
|
|
&& !yy_table_value_is_error_ (yytable_[x + yyn]))
|
|
++count;
|
|
if (count < 5)
|
|
{
|
|
count = 0;
|
|
for (int x = yyxbegin; x < yyxend; ++x)
|
|
if (yycheck_[x + yyn] == x && x != yy_error_token_
|
|
&& !yy_table_value_is_error_ (yytable_[x + yyn]))
|
|
{
|
|
res ~= count++ == 0 ? ", expecting " : " or ";
|
|
res ~= yytnamerr_ (yytname_[x]);
|
|
}
|
|
}
|
|
}
|
|
return res;
|
|
}]])[
|
|
return "syntax error";
|
|
}
|
|
|
|
/**
|
|
* Whether the given <code>yypact_</code> value indicates a defaulted state.
|
|
* @@param yyvalue the value to check
|
|
*/
|
|
private static bool yy_pact_value_is_default_ (int yyvalue)
|
|
{
|
|
return yyvalue == yypact_ninf_;
|
|
}
|
|
|
|
/**
|
|
* Whether the given <code>yytable_</code> value indicates a syntax error.
|
|
* @@param yyvalue the value to check
|
|
*/
|
|
private static bool yy_table_value_is_error_ (int yyvalue)
|
|
{
|
|
return yyvalue == yytable_ninf_;
|
|
}
|
|
|
|
/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
|
|
STATE-NUM. */
|
|
private static immutable ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[;
|
|
|
|
/* YYTABLE[YYPACT[STATE-NUM]]. What to do in state STATE-NUM. If
|
|
positive, shift that token. If negative, reduce the rule which
|
|
number is the opposite. If YYTABLE_NINF_, syntax error. */
|
|
private static immutable ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[;
|
|
|
|
]b4_parser_tables_define[
|
|
|
|
/* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
|
|
First, the terminals, then, starting at \a yyntokens_, nonterminals. */
|
|
private static immutable string[] yytname_ =
|
|
@{
|
|
]b4_tname[
|
|
@};
|
|
|
|
]b4_parse_trace_if([[
|
|
/* YYRLINE[YYN] -- Source line where rule number YYN was defined. */
|
|
private static immutable ]b4_int_type_for([b4_rline])[[] yyrline_ =
|
|
@{
|
|
]b4_rline[
|
|
@};
|
|
|
|
// Report on the debug stream that the rule yyrule is going to be reduced.
|
|
private final void yy_reduce_print (int yyrule, ref YYStack yystack)
|
|
{
|
|
if (yydebug == 0)
|
|
return;
|
|
|
|
int yylno = yyrline_[yyrule];
|
|
int yynrhs = yyr2_[yyrule];
|
|
/* Print the symbols being reduced, and their result. */
|
|
yycdebug (format("Reducing stack by rule %d (line %d), ",
|
|
yyrule - 1, yylno));
|
|
|
|
/* The symbols being reduced. */
|
|
for (int yyi = 0; yyi < yynrhs; yyi++)
|
|
yy_symbol_print (format(" $%d =", yyi + 1),
|
|
yystos_[yystack.stateAt(yynrhs - (yyi + 1))],
|
|
]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
|
|
b4_rhs_location(yynrhs, yyi + 1)])[);
|
|
}
|
|
]])[
|
|
|
|
private static token_number_type yytranslate_ (int t)
|
|
{
|
|
]b4_api_token_raw_if(
|
|
[[ import std.conv : to;
|
|
return to!byte (t);]],
|
|
[[ /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */
|
|
immutable token_number_type[] translate_table =
|
|
@{
|
|
]b4_translate[
|
|
@};
|
|
|
|
immutable int user_token_number_max_ = ]b4_user_token_number_max[;
|
|
immutable token_number_type undef_token_ = ]b4_undef_token_number[;
|
|
|
|
if (t <= 0)
|
|
return YYTokenType.EOF;
|
|
else if (t <= user_token_number_max_)
|
|
return translate_table[t];
|
|
else
|
|
return undef_token_;]])[
|
|
}
|
|
|
|
alias ]b4_int_type_for([b4_translate])[ token_number_type;
|
|
|
|
private static immutable token_number_type yy_error_token_ = 1;
|
|
|
|
private static immutable int yylast_ = ]b4_last[;
|
|
private static immutable int yynnts_ = ]b4_nterms_number[;
|
|
private static immutable int yyempty_ = -2;
|
|
private static immutable int yyfinal_ = ]b4_final_state_number[;
|
|
private static immutable int yyntokens_ = ]b4_tokens_number[;
|
|
|
|
private final struct YYStackElement {
|
|
int state;
|
|
]b4_yystype[ value;]b4_locations_if(
|
|
b4_location_type[[] location;])[
|
|
}
|
|
|
|
private final struct YYStack {
|
|
private YYStackElement[] stack = [];
|
|
|
|
public final @@property ulong height()
|
|
{
|
|
return stack.length;
|
|
}
|
|
|
|
public final void push (int state, ]b4_yystype[ value]dnl
|
|
b4_locations_if([, ref ]b4_location_type[ loc])[)
|
|
{
|
|
stack ~= YYStackElement(state, value]b4_locations_if([, loc])[);
|
|
}
|
|
|
|
public final void pop ()
|
|
{
|
|
pop (1);
|
|
}
|
|
|
|
public final void pop (int num)
|
|
{
|
|
stack.length -= num;
|
|
}
|
|
|
|
public final int stateAt (int i)
|
|
{
|
|
return stack[$-i-1].state;
|
|
}
|
|
|
|
]b4_locations_if([[
|
|
public final ref ]b4_location_type[ locationAt (int i)
|
|
{
|
|
return stack[$-i-1].location;
|
|
}]])[
|
|
|
|
public final ref ]b4_yystype[ valueAt (int i)
|
|
{
|
|
return stack[$-i-1].value;
|
|
}
|
|
]b4_parse_trace_if([[
|
|
// Print the state stack on the debug stream.
|
|
public final void print (File stream)
|
|
{
|
|
stream.write ("Stack now");
|
|
for (int i = 0; i < stack.length; i++)
|
|
stream.write (" ", stack[i].state);
|
|
stream.writeln ();
|
|
}]])[
|
|
}
|
|
|
|
/* User implementation code. */
|
|
]b4_percent_code_get[
|
|
}
|
|
]b4_epilogue[]dnl
|
|
b4_output_end
|