private scanIdentifier()

in src/scanner.ts [531:567]

• 30 lines of code
• 9 McCabe index (conditional complexity)

    private scanIdentifier(): RawToken {
        let type: Token;
        const start = this.index;

        // Backslash (U+005C) starts an escaped character.
        const id = (this.source.charCodeAt(start) === 0x5C) ? this.getComplexIdentifier() : this.getIdentifier();

        // There is no keyword or literal with only one character.
        // Thus, it must be an identifier.
        if (id.length === 1) {
            type = Token.Identifier;
        } else if (this.isKeyword(id)) {
            type = Token.Keyword;
        } else if (id === 'null') {
            type = Token.NullLiteral;
        } else if (id === 'true' || id === 'false') {
            type = Token.BooleanLiteral;
        } else {
            type = Token.Identifier;
        }

        if (type !== Token.Identifier && (start + id.length !== this.index)) {
            const restore = this.index;
            this.index = start;
            this.tolerateUnexpectedToken(Messages.InvalidEscapedReservedWord);
            this.index = restore;
        }

        return {
            type: type,
            value: id,
            lineNumber: this.lineNumber,
            lineStart: this.lineStart,
            start: start,
            end: this.index
        };
    }