private Expresion ParseNull()
{
Expresion resultado = new LiteralNull();
lexer.Aceptar();
return(resultado);
}
// $ANTLR start "literal"
// JavaScript.g:364:1: literal : ( 'null' | 'true' | 'false' | StringLiteral -> StringLiteral[new JSString(ProcessEscapedString($StringLiteral.Text))] | NumericLiteral -> NumericLiteral[new JSNumber($NumericLiteral.Text.ToJSNumber())] | RegexLiteral );
public JavaScriptParser.literal_return literal() // throws RecognitionException [1]
{
JavaScriptParser.literal_return retval = new JavaScriptParser.literal_return();
retval.Start = input.LT(1);
object root_0 = null;
IToken string_literal430 = null;
IToken string_literal431 = null;
IToken string_literal432 = null;
IToken StringLiteral433 = null;
IToken NumericLiteral434 = null;
IToken RegexLiteral435 = null;
object string_literal430_tree=null;
object string_literal431_tree=null;
object string_literal432_tree=null;
object StringLiteral433_tree=null;
object NumericLiteral434_tree=null;
object RegexLiteral435_tree=null;
RewriteRuleTokenStream stream_StringLiteral = new RewriteRuleTokenStream(adaptor,"token StringLiteral");
RewriteRuleTokenStream stream_NumericLiteral = new RewriteRuleTokenStream(adaptor,"token NumericLiteral");
try
{
// JavaScript.g:365:2: ( 'null' | 'true' | 'false' | StringLiteral -> StringLiteral[new JSString(ProcessEscapedString($StringLiteral.Text))] | NumericLiteral -> NumericLiteral[new JSNumber($NumericLiteral.Text.ToJSNumber())] | RegexLiteral )
int alt216 = 6;
switch ( input.LA(1) )
{
case 112:
{
alt216 = 1;
}
break;
case 113:
{
alt216 = 2;
}
break;
case 114:
{
alt216 = 3;
}
break;
case StringLiteral:
{
alt216 = 4;
}
break;
case NumericLiteral:
{
alt216 = 5;
}
break;
case RegexLiteral:
{
alt216 = 6;
}
break;
default:
if ( state.backtracking > 0 ) {state.failed = true; return retval;}
NoViableAltException nvae_d216s0 =
new NoViableAltException("", 216, 0, input);
throw nvae_d216s0;
}
switch (alt216)
{
case 1 :
// JavaScript.g:365:4: 'null'
{
root_0 = (object)adaptor.GetNilNode();
string_literal430=(IToken)Match(input,112,FOLLOW_112_in_literal3258); if (state.failed) return retval;
if ( state.backtracking == 0 )
{string_literal430_tree = new LiteralNull(string_literal430) ;
adaptor.AddChild(root_0, string_literal430_tree);
}
}
break;
case 2 :
// JavaScript.g:366:4: 'true'
{
root_0 = (object)adaptor.GetNilNode();
string_literal431=(IToken)Match(input,113,FOLLOW_113_in_literal3266); if (state.failed) return retval;
if ( state.backtracking == 0 )
{string_literal431_tree = new LiteralTrue(string_literal431) ;
adaptor.AddChild(root_0, string_literal431_tree);
}
}
break;
case 3 :
// JavaScript.g:367:4: 'false'
{
root_0 = (object)adaptor.GetNilNode();
string_literal432=(IToken)Match(input,114,FOLLOW_114_in_literal3274); if (state.failed) return retval;
if ( state.backtracking == 0 )
{string_literal432_tree = new LiteralFalse(string_literal432) ;
adaptor.AddChild(root_0, string_literal432_tree);
}
}
break;
case 4 :
// JavaScript.g:368:4: StringLiteral
{
StringLiteral433=(IToken)Match(input,StringLiteral,FOLLOW_StringLiteral_in_literal3282); if (state.failed) return retval;
if ( (state.backtracking==0) ) stream_StringLiteral.Add(StringLiteral433);
// AST REWRITE
// elements: StringLiteral
// token labels:
// rule labels: retval
// token list labels:
// rule list labels:
// wildcard labels:
if ( (state.backtracking==0) ) {
retval.Tree = root_0;
RewriteRuleSubtreeStream stream_retval = new RewriteRuleSubtreeStream(adaptor, "rule retval", retval!=null ? retval.Tree : null);
root_0 = (object)adaptor.GetNilNode();
// 368:18: -> StringLiteral[new JSString(ProcessEscapedString($StringLiteral.Text))]
{
adaptor.AddChild(root_0, new LiteralNode(StringLiteral, new JSString(ProcessEscapedString(StringLiteral433.Text))));
}
retval.Tree = root_0;retval.Tree = root_0;}
}
break;
case 5 :
// JavaScript.g:369:4: NumericLiteral
{
NumericLiteral434=(IToken)Match(input,NumericLiteral,FOLLOW_NumericLiteral_in_literal3295); if (state.failed) return retval;
if ( (state.backtracking==0) ) stream_NumericLiteral.Add(NumericLiteral434);
// AST REWRITE
// elements: NumericLiteral
// token labels:
// rule labels: retval
// token list labels:
// rule list labels:
// wildcard labels:
if ( (state.backtracking==0) ) {
retval.Tree = root_0;
RewriteRuleSubtreeStream stream_retval = new RewriteRuleSubtreeStream(adaptor, "rule retval", retval!=null ? retval.Tree : null);
root_0 = (object)adaptor.GetNilNode();
// 369:19: -> NumericLiteral[new JSNumber($NumericLiteral.Text.ToJSNumber())]
{
adaptor.AddChild(root_0, new LiteralNode(NumericLiteral, new JSNumber(NumericLiteral434.Text.ToJSNumber())));
}
retval.Tree = root_0;retval.Tree = root_0;}
}
break;
case 6 :
// JavaScript.g:370:4: RegexLiteral
{
root_0 = (object)adaptor.GetNilNode();
RegexLiteral435=(IToken)Match(input,RegexLiteral,FOLLOW_RegexLiteral_in_literal3308); if (state.failed) return retval;
if ( state.backtracking == 0 )
{RegexLiteral435_tree = new LiteralRegex(RegexLiteral435) ;
adaptor.AddChild(root_0, RegexLiteral435_tree);
}
}
break;
}
retval.Stop = input.LT(-1);
if ( (state.backtracking==0) )
{ retval.Tree = (object)adaptor.RulePostProcessing(root_0);
adaptor.SetTokenBoundaries(retval.Tree, (IToken) retval.Start, (IToken) retval.Stop);}
}
catch (RecognitionException re)
{
ReportError(re);
Recover(input,re);
// Conversion of the second argument necessary, but harmless
retval.Tree = (object)adaptor.ErrorNode(input, (IToken) retval.Start, input.LT(-1), re);
}
finally
{
}
return retval;
}
public virtual void Visit(LiteralNull node)
{
}
public void Visit(LiteralNull node)
{
}