isRegexStart()

in src/tokenizer.ts [43:77]

• 27 lines of code
• 12 McCabe index (conditional complexity)

    isRegexStart() {
        const previous = this.values[this.values.length - 1];
        let regex = (previous !== null);

        switch (previous) {
            case 'this':
            case ']':
                regex = false;
                break;

            case ')':
                const keyword = this.values[this.paren - 1];
                regex = (keyword === 'if' || keyword === 'while' || keyword === 'for' || keyword === 'with');
                break;

            case '}':
                // Dividing a function by anything makes little sense,
                // but we have to check for that.
                regex = true;
                if (this.values[this.curly - 3] === 'function') {
                    // Anonymous function, e.g. function(){} /42
                    const check = this.values[this.curly - 4];
                    regex = check ? !this.beforeFunctionExpression(check) : false;
                } else if (this.values[this.curly - 4] === 'function') {
                    // Named function, e.g. function f(){} /42/
                    const check = this.values[this.curly - 5];
                    regex = check ? !this.beforeFunctionExpression(check) : true;
                }
                break;
            default:
                break;
        }

        return regex;
    }