// ident '.' ident
MemberReferenceExpression ParseMemberRef(BVE5RouteFileLexer lexer, BVE5Language.Ast.Expression parent)
{
Token token = lexer.Current;
Debug.Assert(token.Literal == ".", "Really meant a member reference?");
lexer.Advance();
token = lexer.Current;
Identifier ident = null;
if(token.Kind == TokenKind.Identifier){
ident = ParseIdent(lexer);
}else{
AddError(ErrorCode.SyntaxError, token.Line, token.Column, "Unexpected token: " + token.Kind);
if(enable_strict_parsing)
return null;
}
token = lexer.Current;
return AstNode.MakeMemRef(parent, ident, parent.StartLocation, token.StartLoc);
}
// expr '(' [arguments] ')'
Expression ParseInvokeExpr(BVE5RouteFileLexer lexer, BVE5Language.Ast.Expression callTarget)
{
if(has_error_reported) return callTarget;
Token token = lexer.Current;
Debug.Assert(token.Literal == "(", "Really meant an invoke expression?");
lexer.Advance();
token = lexer.Current;
var args = new List<BVE5Language.Ast.Expression>();
while(token.Kind != TokenKind.EOF && token.Literal != ")"){
args.Add(ParseRValueExpression(lexer));
token = lexer.Current;
if(token.Literal == ","){
lexer.Advance();
token = lexer.Current;
}
}
if(token.Kind == TokenKind.EOF){
AddError(ErrorCode.UnexpectedEOF, token.Line, token.Column, "Unexpected EOF!");
if(enable_strict_parsing)
return null;
}else if(token.Literal != ")"){
AddError(ErrorCode.SyntaxError, token.Line, token.Column, "Missing ')'");
if(enable_strict_parsing)
return null;
}else{
lexer.Advance();
token = lexer.Current;
}
return AstNode.MakeInvoke(callTarget, args, callTarget.StartLocation, token.StartLoc); //token should be pointing to a closing parenthesis token
}
// expr '(' [arguments] ')'
private InvocationExpression ParseInvokeExpr(BVE5RouteFileLexer lexer, BVE5Language.Ast.Expression callTarget)
{
Debug.Assert(lexer.Current.Literal == "(", "Really meant an invoke expression?");
lexer.Advance();
Token token = lexer.Current;
var args = new List<BVE5Language.Ast.Expression>();
while(token.Kind != TokenKind.EOF && token.Literal != ")"){
args.Add(ParseArgument(lexer));
token = lexer.Current;
if(token.Literal == ","){
lexer.Advance();
token = lexer.Current;
}
}
if(token.Kind == TokenKind.EOF)
throw new BVE5ParserException(token.Line, token.Column, "Unexpected EOF!");
lexer.Advance();
return AstNode.MakeInvoke(callTarget, args, callTarget.StartLocation, token.EndLoc);
}
// ident '.' ident
private MemberReferenceExpression ParseMemberRef(BVE5RouteFileLexer lexer, BVE5Language.Ast.Expression parent)
{
Debug.Assert(lexer.Current.Literal == ".", "Really meant a member reference?");
lexer.Advance();
Token token = lexer.Current;
if(token.Kind != TokenKind.Identifier)
throw new BVE5ParserException(token.Line, token.Column, "Unexpected token: " + token.Kind);
Identifier ident = ParseIdent(lexer);
return AstNode.MakeMemRef(parent, ident, parent.StartLocation, ident.EndLocation);
}
// ident '[' ident ']'
private IndexerExpression ParseIndexExpr(BVE5RouteFileLexer lexer, BVE5Language.Ast.Expression target)
{
Debug.Assert(lexer.Current.Literal == "[", "Really meant an index reference?");
lexer.Advance();
Token token = lexer.Current;
if(token.Kind != TokenKind.Identifier)
throw new BVE5ParserException(token.Line, token.Column, "Unexpected token: " + token.Kind);
Identifier ident = ParseIdent(lexer);
token = lexer.Current;
if(token.Literal != "]")
throw new BVE5ParserException(token.Line, token.Column, "Expected ']' but got " + token.Literal);
lexer.Advance();
return AstNode.MakeIndexExpr(target, ident, target.StartLocation, token.EndLoc);
}