public override void Visit(BreakStatement node)
{
base.Visit(node);
DebugAssert.IsNonZero(_loopContextStack.Count, "break statement within loop");
_expressionStack.Push(node, Expression.Break(_loopContextStack.Peek().BreakLabel));
}
public override void Visit(BreakStatement breakStatement)
{
base.Visit(breakStatement);
if(_loopStack.Count == 0)
_errorCollector.BreakNotAllowedHere(breakStatement.Location);
}
public virtual void Visit(BreakStatement node)
{
this.BeforeVisitCatchAll(node);
}
AstNodeBase ParseStatement()
{
Token temp;
AstNodeBase retval;
Token peekedToken = _lexer.PeekToken();
switch (peekedToken.HappyTokenKind)
{
case HappyTokenKind.KeywordIf:
retval = this.ParseIf();
break;
case HappyTokenKind.KeywordWhile:
retval = this.ParseWhile();
break;
case HappyTokenKind.KeywordFor:
retval = this.ParseFor();
break;
case HappyTokenKind.Verbatim:
temp = _lexer.NextToken();
retval = new VerbatimSection(temp.Location, temp.Text);
break;
case HappyTokenKind.KeywordReturn:
retval = ParseReturn();
this.ExpectEOS();
break;
case HappyTokenKind.KeywordDef:
retval = ParseDef();
break;
case HappyTokenKind.Output:
retval = this.ParseOutputExpression();
break;
case HappyTokenKind.KeywordBreak:
_lexer.NextToken();
retval = new BreakStatement(peekedToken.Location);
this.ExpectEOS();
break;
case HappyTokenKind.KeywordContinue:
_lexer.NextToken();
retval = new ContinueStatement(peekedToken.Location);
this.ExpectEOS();
break;
case HappyTokenKind.Identifier:
case HappyTokenKind.LiteralString:
case HappyTokenKind.LiteralDecimalInt32:
case HappyTokenKind.LiteralBool:
case HappyTokenKind.LiteralDouble:
case HappyTokenKind.OperatorOpenParen:
retval = this.ParseExpression(ExpressionContext.Expression);
this.ExpectEOS();
break;
case HappyTokenKind.BeginTemplate:
retval = this.ParseExpression(ExpressionContext.Expression);
break;
case HappyTokenKind.VerbatimOutputExpressionDelimiter:
{
//TODO: parse multiple output expressions here...
_lexer.NextToken();
ExpressionNodeBase exp = this.ParseExpression(ExpressionContext.Expression);
this.Expect(HappyTokenKind.VerbatimOutputExpressionDelimiter, "$");
retval = new OutputStatement(new[] { exp });
}
break;
case HappyTokenKind.KeywordSwitch:
retval = this.ParseSwitch();
break;
default:
temp = _lexer.NextToken();
retval = new UnexpectedToken(temp.Location);
_errorCollector.UnexpectedToken(temp);
break;
}
DebugAssert.IsNotNull(retval, "return value is null");
return retval;
}