Method scanTemplate

src/scanner.ts:961–1085

()

    // https://tc39.github.io/ecma262/#sec-template-literal-lexical-components

    private scanTemplate(): RawToken {
        let cooked = '';
        let terminated = false;
        const start = this.index;

        const head = (this.source[start] === '`');
        let tail = false;
        let rawOffset = 2;

        ++this.index;

        while (!this.eof()) {
            let ch = this.source[this.index++];
            if (ch === '`') {
                rawOffset = 1;
                tail = true;
                terminated = true;
                break;
            } else if (ch === '$') {
                if (this.source[this.index] === '{') {
                    this.curlyStack.push('${');
                    ++this.index;
                    terminated = true;
                    break;
                }
                cooked += ch;
            } else if (ch === '\\') {
                ch = this.source[this.index++];
                if (!Character.isLineTerminator(ch.charCodeAt(0))) {
                    switch (ch) {
                        case 'n':
                            cooked += '\n';
                            break;
                        case 'r':
                            cooked += '\r';
                            break;
                        case 't':
                            cooked += '\t';
                            break;
                        case 'u':
                            if (this.source[this.index] === '{') {
                                ++this.index;
                                cooked += this.scanUnicodeCodePointEscape();
                            } else {
                                const restore = this.index;
                                const unescaped = this.scanHexEscape(ch);
                                if (unescaped !== null) {
                                    cooked += unescaped;
                                } else {
                                    this.index = restore;
                                    cooked += ch;
                                }
                            }
                            break;
                        case 'x':
                            const unescaped = this.scanHexEscape(ch);
                            if (unescaped === null) {
                                this.throwUnexpectedToken(Messages.InvalidHexEscapeSequence);