webpack/lib/BasicEvaluatedExpression.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const TypeUnknown = 0;
const TypeNull = 1;
const TypeString = 2;
const TypeNumber = 3;
const TypeBoolean = 4;
const TypeRegExp = 5;
const TypeConditional = 6;
const TypeArray = 7;
const TypeConstArray = 8;
const TypeIdentifier = 9;
const TypeWrapped = 10;
const TypeTemplateString = 11;

class BasicEvaluatedExpression {
	constructor() {
		this.type = TypeUnknown;
		this.range = null;
		this.falsy = false;
		this.truthy = false;
		this.bool = null;
		this.number = null;
		this.regExp = null;
		this.string = null;
		this.quasis = null;
		this.parts = null;
		this.array = null;
		this.items = null;
		this.options = null;
		this.prefix = null;
		this.postfix = null;
		this.wrappedInnerExpressions = null;
		this.expression = null;
	}

	isNull() {
		return this.type === TypeNull;
	}

	isString() {
		return this.type === TypeString;
	}

	isNumber() {
		return this.type === TypeNumber;
	}

	isBoolean() {
		return this.type === TypeBoolean;
	}

	isRegExp() {
		return this.type === TypeRegExp;
	}

	isConditional() {
		return this.type === TypeConditional;
	}

	isArray() {
		return this.type === TypeArray;
	}

	isConstArray() {
		return this.type === TypeConstArray;
	}

	isIdentifier() {
		return this.type === TypeIdentifier;
	}

	isWrapped() {
		return this.type === TypeWrapped;
	}

	isTemplateString() {
		return this.type === TypeTemplateString;
	}

	isTruthy() {
		return this.truthy;
	}

	isFalsy() {
		return this.falsy;
	}

	asBool() {
		if (this.truthy) return true;
		if (this.falsy) return false;
		if (this.isBoolean()) return this.bool;
		if (this.isNull()) return false;
		if (this.isString()) return this.string !== "";
		if (this.isNumber()) return this.number !== 0;
		if (this.isRegExp()) return true;
		if (this.isArray()) return true;
		if (this.isConstArray()) return true;
		if (this.isWrapped()) {
			return (this.prefix && this.prefix.asBool()) ||
				(this.postfix && this.postfix.asBool())
				? true
				: undefined;
		}
		if (this.isTemplateString()) {
			const str = this.asString();
			if (typeof str === "string") return str !== "";
		}
		return undefined;
	}

	asString() {
		if (this.isBoolean()) return `${this.bool}`;
		if (this.isNull()) return "null";
		if (this.isString()) return this.string;
		if (this.isNumber()) return `${this.number}`;
		if (this.isRegExp()) return `${this.regExp}`;
		if (this.isArray()) {
			let array = [];
			for (const item of this.items) {
				const itemStr = item.asString();
				if (itemStr === undefined) return undefined;
				array.push(itemStr);
			}
			return `${array}`;
		}
		if (this.isConstArray()) return `${this.array}`;
		if (this.isTemplateString()) {
			let str = "";
			for (const part of this.parts) {
				const partStr = part.asString();
				if (partStr === undefined) return undefined;
				str += partStr;
			}
			return str;
		}
		return undefined;
	}

	setString(string) {
		this.type = TypeString;
		this.string = string;
		return this;
	}

	setNull() {
		this.type = TypeNull;
		return this;
	}

	setNumber(number) {
		this.type = TypeNumber;
		this.number = number;
		return this;
	}

	setBoolean(bool) {
		this.type = TypeBoolean;
		this.bool = bool;
		return this;
	}

	setRegExp(regExp) {
		this.type = TypeRegExp;
		this.regExp = regExp;
		return this;
	}

	setIdentifier(identifier) {
		this.type = TypeIdentifier;
		this.identifier = identifier;
		return this;
	}

	setWrapped(prefix, postfix, innerExpressions) {
		this.type = TypeWrapped;
		this.prefix = prefix;
		this.postfix = postfix;
		this.wrappedInnerExpressions = innerExpressions;
		return this;
	}

	setOptions(options) {
		this.type = TypeConditional;
		this.options = options;
		return this;
	}

	addOptions(options) {
		if (!this.options) {
			this.type = TypeConditional;
			this.options = [];
		}
		for (const item of options) {
			this.options.push(item);
		}
		return this;
	}

	setItems(items) {
		this.type = TypeArray;
		this.items = items;
		return this;
	}

	setArray(array) {
		this.type = TypeConstArray;
		this.array = array;
		return this;
	}

	setTemplateString(quasis, parts, kind) {
		this.type = TypeTemplateString;
		this.quasis = quasis;
		this.parts = parts;
		this.templateStringKind = kind;
		return this;
	}

	setTruthy() {
		this.falsy = false;
		this.truthy = true;
		return this;
	}

	setFalsy() {
		this.falsy = true;
		this.truthy = false;
		return this;
	}

	setRange(range) {
		this.range = range;
		return this;
	}

	setExpression(expression) {
		this.expression = expression;
		return this;
	}
}

module.exports = BasicEvaluatedExpression;