anonymous structure completion

thing.hx

    static var reFieldPart = ~/(\.|@(:?))(\w*)$/;
    static function calculateCompletionPosition(text:String, index:Int):CompletionPosition {
        if (reFieldPart.match(text))
            return {
                pos: index - reFieldPart.matched(3).length,
                toplevel: false,
            };

        var bracketLevel = 0;
        var i = index;
        var isAnonymousStruct = false;
        var bracketStart = -1;
        var foundComma = false;
        var editingIdent = true;
        while (i >= 0) {
            switch (text.charAt(i)) {
                case '}' | ')' | ']' | '>':
                    ++bracketLevel;
                case '{' | '(' | '[' | '<':
                    if(bracketLevel == 0 && text.charAt(i) == '{' && bracketStart == -1) {
                        bracketStart = i + 1;
                        ++bracketLevel;
                    } else if(bracketLevel == 0 && text.charAt(i) == '(' && bracketStart != -1) {
                        isAnonymousStruct = true;
                        break;
                    }
                    --bracketLevel;
                case ',':
                    if(bracketLevel == 0 && bracketStart == -1)
                        foundComma = true;
                case ':':
                    if(bracketLevel == 0 && !foundComma && bracketStart == -1)
                        editingIdent = false;
                default:
            }
            //if(bracketLevel < 0) break;
            i--;
        }

        if(isAnonymousStruct && editingIdent && bracketStart != -1){
            return {
            pos: bracketStart,
            toplevel: false,
        };}

        var whitespaceAmount = text.length - text.rtrim().length;

        return {
            pos: index - whitespaceAmount,
            toplevel: true,
        };
    }