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d: remove yychar from YYParse.parse()

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The yychar variable was keeping the external form of the token (the
TokenKind).  As the D parser translates the token to its internal
form (the SymbolKind) inside the struct Symbol, there is no need for
yychar anymore.

* data/examples/lalr1.d (yychar): Remove.
Use only yytoken.
This commit is contained in:
Adela Vais
2020-12-11 00:06:25 +02:00
committed by Akim Demaille
parent cc04459cfe
commit 6692df8992
1 changed files with 7 additions and 13 deletions
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20
data/skeletons/lalr1.d
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@@ -420,8 +420,6 @@ b4_locations_if([, ref ]b4_location_type[ yylocationp])[)
*/ */
public bool parse () public bool parse ()
{ {
// Lookahead token kind.
int yychar = TokenKind.]b4_symbol(empty, id)[;
// Lookahead symbol kind. // Lookahead symbol kind.
SymbolKind yytoken = ]b4_symbol(empty, kind)[; SymbolKind yytoken = ]b4_symbol(empty, kind)[;
@@ -489,17 +487,16 @@ m4_popdef([b4_at_dollar])])dnl
} }
/* Read a lookahead token. */ /* Read a lookahead token. */
if (yychar == TokenKind.]b4_symbol(empty, id)[) if (yytoken == ]b4_symbol(empty, kind)[)
{]b4_parse_trace_if([[ {]b4_parse_trace_if([[
yycdebugln ("Reading a token");]])[ yycdebugln ("Reading a token");]])[
Symbol yysymbol = yylex(); Symbol yysymbol = yylex();
yychar = yysymbol.token(); yytoken = yysymbol.token();
yylval = yysymbol.value();]b4_locations_if([[ yylval = yysymbol.value();]b4_locations_if([[
yylloc = yysymbol.location();]])[ yylloc = yysymbol.location();]])[
} }
/* Convert token to internal form. */ /* Token already converted to internal form. */]b4_parse_trace_if([[
yytoken = yytranslate_ (yychar);]b4_parse_trace_if([[
yy_symbol_print ("Next token is", yytoken, yylval]b4_locations_if([, yylloc])[);]])[ yy_symbol_print ("Next token is", yytoken, yylval]b4_locations_if([, yylloc])[);]])[
if (yytoken == ]b4_symbol(error, kind)[) if (yytoken == ]b4_symbol(error, kind)[)
@@ -508,7 +505,6 @@ m4_popdef([b4_at_dollar])])dnl
// to error recovery. But do not keep the error token as // to error recovery. But do not keep the error token as
// lookahead, it is too special and may lead us to an endless // lookahead, it is too special and may lead us to an endless
// loop in error recovery. */ // loop in error recovery. */
yychar = TokenKind.]b4_symbol(undef, id)[;
yytoken = ]b4_symbol(undef, kind)[;]b4_locations_if([[ yytoken = ]b4_symbol(undef, kind)[;]b4_locations_if([[
yyerrloc = yylloc;]])[ yyerrloc = yylloc;]])[
label = YYERRLAB1; label = YYERRLAB1;
@@ -543,7 +539,7 @@ m4_popdef([b4_at_dollar])])dnl
yy_symbol_print ("Shifting", yytoken, yylval]b4_locations_if([, yylloc])[);]])[ yy_symbol_print ("Shifting", yytoken, yylval]b4_locations_if([, yylloc])[);]])[
/* Discard the token being shifted. */ /* Discard the token being shifted. */
yychar = TokenKind.]b4_symbol(empty, id)[; yytoken = ]b4_symbol(empty, kind)[;
/* Count tokens shifted since error; after three, turn off error /* Count tokens shifted since error; after three, turn off error
* status. */ * status. */
@@ -586,8 +582,6 @@ m4_popdef([b4_at_dollar])])dnl
if (yyerrstatus_ == 0) if (yyerrstatus_ == 0)
{ {
++yynerrs_; ++yynerrs_;
if (yychar == TokenKind.]b4_symbol(empty, id)[)
yytoken = ]b4_symbol(empty, kind)[;
yyreportSyntaxError(new Context(]b4_lac_if([[this, ]])[yystack, yytoken]b4_locations_if([[, yylloc]])[)); yyreportSyntaxError(new Context(]b4_lac_if([[this, ]])[yystack, yytoken]b4_locations_if([[, yylloc]])[));
} }
]b4_locations_if([ ]b4_locations_if([
@@ -597,14 +591,14 @@ m4_popdef([b4_at_dollar])])dnl
/* If just tried and failed to reuse lookahead token after an /* If just tried and failed to reuse lookahead token after an
* error, discard it. */ * error, discard it. */
if (yychar <= TokenKind.]b4_symbol(eof, [id])[) if (yytoken <= ]b4_symbol(eof, [kind])[)
{ {
/* Return failure if at end of input. */ /* Return failure if at end of input. */
if (yychar == TokenKind.]b4_symbol(eof, [id])[) if (yytoken == ]b4_symbol(eof, [kind])[)
return false; return false;
} }
else else
yychar = TokenKind.]b4_symbol(empty, id)[; yytoken = ]b4_symbol(empty, kind)[;
} }
/* Else will try to reuse lookahead token after shifting the error /* Else will try to reuse lookahead token after shifting the error