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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Web.Razor.Generator;
using System.Web.Razor.Parser.SyntaxTree;
using System.Web.Razor.Resources;
using System.Web.Razor.Text;
using System.Web.Razor.Tokenizer;
using System.Web.Razor.Tokenizer.Symbols;
namespace System.Web.Razor.Parser
{
public partial class VBCodeParser : TokenizerBackedParser<VBTokenizer, VBSymbol, VBSymbolType>
{
private void SetUpKeywords()
{
MapKeyword(VBKeyword.Using, EndTerminatedStatement(VBKeyword.Using, supportsExit: false, supportsContinue: false)); // http://msdn.microsoft.com/en-us/library/htd05whh.aspx
MapKeyword(VBKeyword.While, EndTerminatedStatement(VBKeyword.While, supportsExit: true, supportsContinue: true)); // http://msdn.microsoft.com/en-us/library/zh1f56zs.aspx
MapKeyword(VBKeyword.If, EndTerminatedStatement(VBKeyword.If, supportsExit: false, supportsContinue: false)); // http://msdn.microsoft.com/en-us/library/752y8abs.aspx
MapKeyword(VBKeyword.Select, EndTerminatedStatement(VBKeyword.Select, supportsExit: true, supportsContinue: false, blockName: SyntaxConstants.VB.SelectCaseKeyword)); // http://msdn.microsoft.com/en-us/library/cy37t14y.aspx
MapKeyword(VBKeyword.Try, EndTerminatedStatement(VBKeyword.Try, supportsExit: true, supportsContinue: false)); // http://msdn.microsoft.com/en-us/library/fk6t46tz.aspx
MapKeyword(VBKeyword.With, EndTerminatedStatement(VBKeyword.With, supportsExit: false, supportsContinue: false)); // http://msdn.microsoft.com/en-us/library/wc500chb.aspx
MapKeyword(VBKeyword.SyncLock, EndTerminatedStatement(VBKeyword.SyncLock, supportsExit: false, supportsContinue: false)); // http://msdn.microsoft.com/en-us/library/3a86s51t.aspx
// http://msdn.microsoft.com/en-us/library/5z06z1kb.aspx
// http://msdn.microsoft.com/en-us/library/5ebk1751.aspx
MapKeyword(VBKeyword.For, KeywordTerminatedStatement(VBKeyword.For, VBKeyword.Next, supportsExit: true, supportsContinue: true));
MapKeyword(VBKeyword.Do, KeywordTerminatedStatement(VBKeyword.Do, VBKeyword.Loop, supportsExit: true, supportsContinue: true)); // http://msdn.microsoft.com/en-us/library/eked04a7.aspx
MapKeyword(VBKeyword.Imports, ImportsStatement);
MapKeyword(VBKeyword.Option, OptionStatement);
MapKeyword(VBKeyword.Inherits, InheritsStatement);
MapKeyword(VBKeyword.Class, ReservedWord);
MapKeyword(VBKeyword.Namespace, ReservedWord);
}
protected virtual bool InheritsStatement()
{
Assert(VBKeyword.Inherits);
Span.CodeGenerator = SpanCodeGenerator.Null;
Context.CurrentBlock.Type = BlockType.Directive;
AcceptAndMoveNext();
SourceLocation endInherits = CurrentLocation;
if (At(VBSymbolType.WhiteSpace))
{
Span.EditHandler.AcceptedCharacters = AcceptedCharacters.None;
}
AcceptWhile(VBSymbolType.WhiteSpace);
Output(SpanKind.MetaCode);
if (EndOfFile || At(VBSymbolType.WhiteSpace) || At(VBSymbolType.NewLine))
{
Context.OnError(endInherits, RazorResources.ParseError_InheritsKeyword_Must_Be_Followed_By_TypeName);
}
// Just accept to a newline
AcceptUntil(VBSymbolType.NewLine);
if (!Context.DesignTimeMode)
{
// We want the newline to be treated as code, but it causes issues at design-time.
Optional(VBSymbolType.NewLine);
}
string baseType = Span.GetContent();
Span.CodeGenerator = new SetBaseTypeCodeGenerator(baseType.Trim());
Output(SpanKind.Code);
return false;
}
protected virtual bool OptionStatement()
{
try
{
Context.CurrentBlock.Type = BlockType.Directive;
Assert(VBKeyword.Option);
AcceptAndMoveNext();
AcceptWhile(VBSymbolType.WhiteSpace);
if (!At(VBSymbolType.Identifier))
{
if (CurrentSymbol != null)
{
Context.OnError(CurrentLocation, String.Format(CultureInfo.CurrentCulture,
RazorResources.ParseError_Unexpected,
CurrentSymbol.Content));
}
return false;
}
SourceLocation optionLoc = CurrentLocation;
string option = CurrentSymbol.Content;
AcceptAndMoveNext();
AcceptWhile(VBSymbolType.WhiteSpace);
bool boolVal;
if (At(VBKeyword.On))
{
AcceptAndMoveNext();
boolVal = true;
}
else if (At(VBSymbolType.Identifier))
{
if (String.Equals(CurrentSymbol.Content, SyntaxConstants.VB.OffKeyword, StringComparison.OrdinalIgnoreCase))
{
AcceptAndMoveNext();
boolVal = false;
}
else
{
Context.OnError(CurrentLocation, String.Format(CultureInfo.CurrentCulture,
RazorResources.ParseError_InvalidOptionValue,
option,
CurrentSymbol.Content));
AcceptAndMoveNext();
return false;
}
}
else
{
if (!EndOfFile)
{
Context.OnError(CurrentLocation, String.Format(CultureInfo.CurrentCulture,
RazorResources.ParseError_Unexpected,
CurrentSymbol.Content));
AcceptAndMoveNext();
}
return false;
}
if (String.Equals(option, SyntaxConstants.VB.StrictKeyword, StringComparison.OrdinalIgnoreCase))
{
Span.CodeGenerator = SetVBOptionCodeGenerator.Strict(boolVal);
}
else if (String.Equals(option, SyntaxConstants.VB.ExplicitKeyword, StringComparison.OrdinalIgnoreCase))
{
Span.CodeGenerator = SetVBOptionCodeGenerator.Explicit(boolVal);
}
else
{
Span.CodeGenerator = new SetVBOptionCodeGenerator(option, boolVal);
Context.OnError(optionLoc, RazorResources.ParseError_UnknownOption, option);
}
}
finally
{
if (Span.Symbols.Count > 0)
{
Output(SpanKind.MetaCode);
}
}
return true;
}
protected virtual bool ImportsStatement()
{
Context.CurrentBlock.Type = BlockType.Directive;
Assert(VBKeyword.Imports);
AcceptAndMoveNext();
AcceptVBSpaces();
if (At(VBSymbolType.WhiteSpace) || At(VBSymbolType.NewLine))
{
Context.OnError(CurrentLocation, RazorResources.ParseError_NamespaceOrTypeAliasExpected);
}
// Just accept to a newline
AcceptUntil(VBSymbolType.NewLine);
Optional(VBSymbolType.NewLine);
string ns = String.Concat(Span.Symbols.Skip(1).Select(s => s.Content));
Span.CodeGenerator = new AddImportCodeGenerator(ns, SyntaxConstants.VB.ImportsKeywordLength);
Output(SpanKind.MetaCode);
return false;
}
protected virtual Func<bool> EndTerminatedStatement(VBKeyword keyword, bool supportsExit, bool supportsContinue)
{
return EndTerminatedStatement(keyword, supportsExit, supportsContinue, blockName: keyword.ToString());
}
protected virtual Func<bool> EndTerminatedStatement(VBKeyword keyword, bool supportsExit, bool supportsContinue, string blockName)
{
return () =>
{
using (PushSpanConfig(StatementBlockSpanConfiguration(new StatementCodeGenerator())))
{
SourceLocation blockStart = CurrentLocation;
Assert(keyword);
AcceptAndMoveNext();
while (!EndOfFile)
{
VBSymbol lastWhitespace = AcceptWhiteSpaceInLines();
if (IsAtEmbeddedTransition(allowTemplatesAndComments: true, allowTransitions: true))
{
HandleEmbeddedTransition(lastWhitespace);
}
else
{
Accept(lastWhitespace);
if ((supportsExit && At(VBKeyword.Exit)) || (supportsContinue && At(VBKeyword.Continue)))
{
HandleExitOrContinue(keyword);
}
else if (At(VBKeyword.End))
{
AcceptAndMoveNext();
AcceptVBSpaces();
if (At(keyword))
{
AcceptAndMoveNext();
if (!Context.DesignTimeMode)
{
Optional(VBSymbolType.NewLine);
}
Span.EditHandler.AcceptedCharacters = AcceptedCharacters.None;
return false;
}
}
else if (At(keyword))
{
// Parse nested statement
EndTerminatedStatement(keyword, supportsExit, supportsContinue)();
}
else if (!EndOfFile)
{
AcceptAndMoveNext();
}
}
}
Context.OnError(blockStart,
RazorResources.ParseError_BlockNotTerminated,
blockName,
// This is a language keyword, so it does not need to be localized
String.Concat(VBKeyword.End, " ", keyword));
return false;
}
};
}
protected virtual Func<bool> KeywordTerminatedStatement(VBKeyword start, VBKeyword terminator, bool supportsExit, bool supportsContinue)
{
return () =>
{
using (PushSpanConfig(StatementBlockSpanConfiguration(new StatementCodeGenerator())))
{
SourceLocation blockStart = CurrentLocation;
Assert(start);
AcceptAndMoveNext();
while (!EndOfFile)
{
VBSymbol lastWhitespace = AcceptWhiteSpaceInLines();
if (IsAtEmbeddedTransition(allowTemplatesAndComments: true, allowTransitions: true))
{
HandleEmbeddedTransition(lastWhitespace);
}
else
{
Accept(lastWhitespace);
if ((supportsExit && At(VBKeyword.Exit)) || (supportsContinue && At(VBKeyword.Continue)))
{
HandleExitOrContinue(start);
}
else if (At(start))
{
// Parse nested statement
KeywordTerminatedStatement(start, terminator, supportsExit, supportsContinue)();
}
else if (At(terminator))
{
AcceptUntil(VBSymbolType.NewLine);
Optional(VBSymbolType.NewLine);
Span.EditHandler.AcceptedCharacters = AcceptedCharacters.AnyExceptNewline;
return false;
}
else if (!EndOfFile)
{
AcceptAndMoveNext();
}
}
}
Context.OnError(blockStart,
RazorResources.ParseError_BlockNotTerminated,
start, terminator);
return false;
}
};
}
protected void HandleExitOrContinue(VBKeyword keyword)
{
Assert(VBSymbolType.Keyword);
Debug.Assert(CurrentSymbol.Keyword == VBKeyword.Continue || CurrentSymbol.Keyword == VBKeyword.Exit);
// Accept, read whitespace and look for the next keyword
AcceptAndMoveNext();
AcceptWhile(VBSymbolType.WhiteSpace);
// If this is the start keyword, skip it and continue (to avoid starting a nested statement block)
Optional(keyword);
}
}
}
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