public static IScope ParseScope(ParseContext context, IAstNode parent, bool allowsSimpleScope, string terminatingKeyword) {
TokenStream<RToken> tokens = context.Tokens;
IScope scope;
if (tokens.CurrentToken.TokenType == RTokenType.OpenCurlyBrace) {
scope = new Scope(string.Empty);
if (scope.Parse(context, parent)) {
return scope;
}
} else if (allowsSimpleScope) {
// Try simple on-line scope as in 'for(...) statement # comment'
scope = new SimpleScope(terminatingKeyword);
if (scope.Parse(context, parent)) {
return scope;
}
} else {
context.AddError(new MissingItemParseError(ParseErrorType.OpenCurlyBraceExpected, tokens.PreviousToken));
}
return null;
}
public override bool Parse(ParseContext context, IAstNode parent) {
TokenStream<RToken> tokens = context.Tokens;
RToken currentToken = tokens.CurrentToken;
context.Scopes.Push(this);
if (!(this is GlobalScope) && currentToken.TokenType == RTokenType.OpenCurlyBrace) {
this.OpenCurlyBrace = RParser.ParseToken(context, this);
}
while (!tokens.IsEndOfStream()) {
currentToken = context.Tokens.CurrentToken;
switch (currentToken.TokenType) {
case RTokenType.CloseCurlyBrace:
if (this.OpenCurlyBrace != null) {
this.CloseCurlyBrace = RParser.ParseToken(context, this);
} else {
context.AddError(new ParseError(ParseErrorType.UnexpectedToken, ErrorLocation.Token, currentToken));
context.Tokens.MoveToNextToken();
}
break;
case RTokenType.OpenCurlyBrace:
IScope scope = new Scope(string.Empty);
scope.Parse(context, this);
break;
default:
IStatement statement = Statement.Create(context, this, null);
if (statement != null) {
if (statement.Parse(context, this)) {
this.statements.Add(statement);
} else {
statement = null;
}
}
if (statement == null) {
if (!context.TextProvider.IsNewLineBeforePosition(context.Tokens.CurrentToken.Start)) {
// try recovering at the next line or past nearest
// semicolon or closing curly brace
tokens.MoveToNextLine(context.TextProvider,
(TokenStream<RToken> ts) => {
return ts.CurrentToken.TokenType == RTokenType.Semicolon ||
ts.NextToken.TokenType == RTokenType.CloseCurlyBrace;
});
} else {
tokens.MoveToNextToken();
}
}
break;
}
if (this.CloseCurlyBrace != null) {
break;
}
}
context.Scopes.Pop();
if (this.OpenCurlyBrace != null && this.CloseCurlyBrace == null) {
context.AddError(new MissingItemParseError(ParseErrorType.CloseCurlyBraceExpected, context.Tokens.PreviousToken));
}
// TODO: process content and fill out declared variables
// and functions and get data to the classifier for colorization.
return base.Parse(context, parent);
}