Method scanPunctuator

src/scanner.ts:568–653

()

    // https://tc39.github.io/ecma262/#sec-punctuators

    private scanPunctuator(): RawToken {
        const start = this.index;

        // Check for most common single-character punctuators.
        let str = this.source[this.index];
        switch (str) {

            case '(':
            case '{':
                if (str === '{') {
                    this.curlyStack.push('{');
                }
                ++this.index;
                break;

            case '.':
                ++this.index;
                if (this.source[this.index] === '.' && this.source[this.index + 1] === '.') {
                    // Spread operator: ...
                    this.index += 2;
                    str = '...';
                }
                break;

            case '}':
                ++this.index;
                this.curlyStack.pop();
                break;
            case ')':
            case ';':
            case ',':
            case '[':
            case ']':
            case ':':
            case '?':
            case '~':
                ++this.index;
                break;

            default:
                // 4-character punctuator.
                str = this.source.substr(this.index, 4);
                if (str === '>>>=') {
                    this.index += 4;
                } else {

                    // 3-character punctuators.
                    str = str.substr(0, 3);
                    if (str === '===' || str === '!==' || str === '>>>' ||
                        str === '<<=' || str === '>>=' || str === '**=') {
                        this.index += 3;
                    } else {

                        // 2-character punctuators.
                        str = str.substr(0, 2);
                        if (str === '&&' || str === '||' || str === '==' || str === '!=' ||
                            str === '+=' || str === '-=' || str === '*=' || str === '/=' ||
                            str === '++' || str === '--' || str === '<<' || str === '>>' ||