butternut/src/program/types/NewExpression.js

Experimental ES2015-aware minifier

import Node from '../Node.js';

export default class NewExpression extends Node {
	getPrecedence () {
		return this.arguments.length > 0 ? 19 : 18;
	}

	initialise ( program, scope ) {
		program.addWord( 'new' );
		super.initialise( program, scope );
	}

	minify ( code, chars ) {
		if ( this.arguments.length ) {
			let lastNode = this.callee;

			for ( let i = 0; i < this.arguments.length; i += 1 ) {
				const argument = this.arguments[i];

				if ( argument.start > lastNode.end + 1 ) code.overwrite( lastNode.end, argument.start, i ? ',' : '(' );
				lastNode = argument;
			}

			if ( this.end > lastNode.end + 1 ) code.overwrite( lastNode.end, this.end, ')' );
		}

		else if ( this.end > this.callee.end ) {
			code.remove( this.callee.end, this.end );
		}

		super.minify( code, chars );
	}
}