private Expression ParsePrimaryExpression(TokenSet followers)
//^ ensures followers[this.currentToken] || this.currentToken == Token.EndOfFile;
{
ISourceLocation sctx = this.scanner.SourceLocationOfLastScannedToken;
Expression expression = new DummyExpression(sctx);
switch (this.currentToken) {
case Token.ArgList:
this.GetNextToken();
expression = new RuntimeArgumentHandleExpression(sctx);
break;
case Token.Delegate:
expression = this.ParseAnonymousMethod(followers);
break;
case Token.New:
expression = this.ParseNew(followers|Token.Dot|Token.LeftBracket|Token.Arrow);
break;
case Token.Identifier:
expression = this.ParseSimpleName(followers|Token.Dot|Token.DoubleColon|Token.Lambda|Token.LeftParenthesis);
if (this.currentToken == Token.DoubleColon) {
if (((SimpleName)expression).Name == this.nameTable.global)
expression = new RootNamespaceExpression(expression.SourceLocation);
expression = this.ParseQualifiedName(expression, followers|Token.Dot|Token.LessThan|Token.LeftParenthesis|Token.AddOne|Token.SubtractOne);
} else if (this.currentToken == Token.Lambda) {
expression = this.ParseLambda((SimpleName)expression, followers);
}
break;
case Token.Null:
expression = new NullLiteral(sctx);
this.GetNextToken();
break;
case Token.True:
expression = new CompileTimeConstant(true, false, sctx);
this.GetNextToken();
break;
case Token.False:
expression = new CompileTimeConstant(false, false, sctx);
this.GetNextToken();
break;
case Token.CharLiteral:
expression = new CompileTimeConstant(this.scanner.charLiteralValue, false, sctx);
this.GetNextToken();
break;
case Token.HexLiteral:
expression = this.ParseHexLiteral();
break;
case Token.IntegerLiteral:
expression = this.ParseIntegerLiteral();
break;
case Token.RealLiteral:
expression = this.ParseRealLiteral();
break;
case Token.StringLiteral:
expression = new CompileTimeConstant(this.scanner.GetString(), false, sctx);
this.GetNextToken();
break;
case Token.This:
expression = new ThisReference(sctx);
this.GetNextToken();
break;
case Token.Base:
expression = new BaseClassReference(sctx);
this.GetNextToken();
break;
case Token.Typeof:
case Token.Sizeof:
case Token.Default:
expression = this.ParseTypeofSizeofOrDefault(followers);
break;
case Token.Stackalloc:
return this.ParseStackalloc(followers);
case Token.Checked:
case Token.MakeRef:
case Token.RefType:
case Token.Unchecked:
expression = this.ParseCheckedOrMakeRefOrRefTypeOrUnchecked(followers);
break;
case Token.RefValue:
expression = this.ParseGetValueOfTypedReference(followers);
break;
case Token.Bool:
case Token.Decimal:
case Token.Sbyte:
case Token.Byte:
case Token.Short:
case Token.Ushort:
case Token.Int:
case Token.Uint:
case Token.Long:
case Token.Ulong:
case Token.Char:
case Token.Float:
case Token.Double:
case Token.Object:
case Token.String:
expression = this.RootQualifiedNameFor(this.currentToken, sctx);
this.GetNextToken();
break;
case Token.LeftParenthesis:
expression = this.ParseCastExpression(followers|Token.Dot|Token.LeftBracket|Token.Arrow);
break;
default:
if (Parser.IdentifierOrNonReservedKeyword[this.currentToken]) goto case Token.Identifier;
if (Parser.InfixOperators[this.currentToken]) {
this.HandleError(Error.InvalidExprTerm, this.scanner.GetTokenSource());
//^ assume this.currentToken != Token.EndOfFile; //should not be a member of InfixOperators
this.GetNextToken();
} else
this.SkipTo(followers|Parser.PrimaryStart, Error.InvalidExprTerm, this.scanner.GetTokenSource());
if (Parser.PrimaryStart[this.currentToken]) return this.ParsePrimaryExpression(followers);
goto done;
}
expression = this.ParseIndexerCallOrSelector(expression, followers|Token.AddOne|Token.SubtractOne);
for (; ; ) {
switch (this.currentToken) {
case Token.AddOne:
SourceLocationBuilder slb = new SourceLocationBuilder(expression.SourceLocation);
slb.UpdateToSpan(this.scanner.SourceLocationOfLastScannedToken);
this.GetNextToken();
expression = new PostfixIncrement(new TargetExpression(expression), slb);
break;
case Token.SubtractOne:
slb = new SourceLocationBuilder(expression.SourceLocation);
slb.UpdateToSpan(this.scanner.SourceLocationOfLastScannedToken);
this.GetNextToken();
expression = new PostfixDecrement(new TargetExpression(expression), slb);
break;
case Token.Arrow:
case Token.Dot:
case Token.LeftBracket:
expression = this.ParseIndexerCallOrSelector(expression, followers|Token.AddOne|Token.SubtractOne);
break;
default:
goto done;
}
}
done:
this.SkipTo(followers);
return expression;
}
private QualifiedName RootQualifiedNameFor(Token tok, ISourceLocation sctx)
//^ requires tok == Token.Bool || tok == Token.Decimal || tok == Token.Sbyte ||
//^ tok == Token.Byte || tok == Token.Short || tok == Token.Ushort ||
//^ tok == Token.Int || tok == Token.Uint || tok == Token.Long ||
//^ tok == Token.Ulong || tok == Token.Char || tok == Token.Float ||
//^ tok == Token.Double || tok == Token.Object || tok == Token.String ||
//^ tok == Token.Void;
{
RootNamespaceExpression rootNs = new RootNamespaceExpression(sctx);
AliasQualifiedName systemNs = new AliasQualifiedName(rootNs, this.GetSimpleNameFor("System"), sctx);
switch (tok) {
case Token.Bool: return new QualifiedName(systemNs, this.GetSimpleNameFor("Boolean"), sctx);
case Token.Decimal: return new QualifiedName(systemNs, this.GetSimpleNameFor("Decimal"), sctx);
case Token.Sbyte: return new QualifiedName(systemNs, this.GetSimpleNameFor("SByte"), sctx);
case Token.Byte: return new QualifiedName(systemNs, this.GetSimpleNameFor("Byte"), sctx);
case Token.Short: return new QualifiedName(systemNs, this.GetSimpleNameFor("Int16"), sctx);
case Token.Ushort: return new QualifiedName(systemNs, this.GetSimpleNameFor("UInt16"), sctx);
case Token.Int: return new QualifiedName(systemNs, this.GetSimpleNameFor("Int32"), sctx);
case Token.Uint: return new QualifiedName(systemNs, this.GetSimpleNameFor("UInt32"), sctx);
case Token.Long: return new QualifiedName(systemNs, this.GetSimpleNameFor("Int64"), sctx);
case Token.Ulong: return new QualifiedName(systemNs, this.GetSimpleNameFor("UInt64"), sctx);
case Token.Char: return new QualifiedName(systemNs, this.GetSimpleNameFor("Char"), sctx);
case Token.Float: return new QualifiedName(systemNs, this.GetSimpleNameFor("Single"), sctx);
case Token.Double: return new QualifiedName(systemNs, this.GetSimpleNameFor("Double"), sctx);
case Token.Object: return new QualifiedName(systemNs, this.GetSimpleNameFor("Object"), sctx);
case Token.String: return new QualifiedName(systemNs, this.GetSimpleNameFor("String"), sctx);
default:
//^ assert tok == Token.Void;
return new QualifiedName(systemNs, this.GetSimpleNameFor("Void"), sctx);
}
}
private Expression ParseNamespaceOrTypeName(bool allowEmptyArguments, TokenSet followers)
//^ ensures followers[this.currentToken] || this.currentToken == Token.EndOfFile;
//^ ensures result is SimpleName || result is AliasQualifiedName || result is QualifiedName || result is GenericTypeInstanceExpression;
{
SimpleName rootName = this.ParseSimpleName(followers|Token.Dot|Token.DoubleColon|Token.LessThan);
Expression expression = rootName;
if (rootName.Name.UniqueKey == this.nameTable.global.UniqueKey && this.currentToken == Token.DoubleColon)
expression = new RootNamespaceExpression(rootName.SourceLocation);
SourceLocationBuilder sctx = new SourceLocationBuilder(expression.SourceLocation);
if (this.currentToken == Token.DoubleColon) {
this.GetNextToken();
SimpleName simpleName = this.ParseSimpleName(followers|Token.Dot|Token.LessThan);
sctx.UpdateToSpan(simpleName.SourceLocation);
expression = new AliasQualifiedName(expression, simpleName, sctx.GetSourceLocation());
}
//^ assume expression is SimpleName || expression is AliasQualifiedName; //RootNamespace will always disappear into AliasQualifiedName
moreDots:
while (this.currentToken == Token.Dot)
//^ invariant expression is SimpleName || expression is AliasQualifiedName || expression is QualifiedName || expression is GenericTypeInstanceExpression;
{
this.GetNextToken();
SimpleName simpleName = this.ParseSimpleName(followers|Token.Dot|Token.LessThan);
sctx.UpdateToSpan(simpleName.SourceLocation);
expression = new QualifiedName(expression, simpleName, sctx.GetSourceLocation());
}
if (this.currentToken == Token.LessThan) {
//^ assume expression is SimpleName || expression is AliasQualifiedName || expression is QualifiedName; //Can only get back here if generic instance was followed by dot.
TypeExpression genericType = new NamedTypeExpression(expression);
while (this.currentToken == Token.LessThan)
//^ invariant expression is SimpleName || expression is AliasQualifiedName || expression is QualifiedName || expression is GenericTypeInstanceExpression;
{
List<TypeExpression> arguments = this.ParseTypeArguments(sctx, allowEmptyArguments, followers|Token.Dot);
expression = new GenericTypeInstanceExpression(genericType, arguments.AsReadOnly(), sctx.GetSourceLocation());
}
if (this.currentToken == Token.Dot) goto moreDots;
}
if (this.insideType && !this.insideBlock && !followers[this.currentToken])
this.SkipTo(followers, Error.InvalidMemberDecl, this.scanner.GetTokenSource());
else
this.SkipTo(followers);
return expression;
}
