568 lines
12 KiB
JavaScript
568 lines
12 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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/*
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<rules>: <rule>
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<rules>: [<rule>]
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<rule>: {
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resource: {
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test: <condition>,
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include: <condition>,
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exclude: <condition>,
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},
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resource: <condition>, -> resource.test
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test: <condition>, -> resource.test
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include: <condition>, -> resource.include
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exclude: <condition>, -> resource.exclude
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resourceQuery: <condition>,
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compiler: <condition>,
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issuer: <condition>,
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use: "loader", -> use[0].loader
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loader: <>, -> use[0].loader
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loaders: <>, -> use
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options: {}, -> use[0].options,
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query: {}, -> options
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parser: {},
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use: [
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"loader" -> use[x].loader
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],
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use: [
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{
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loader: "loader",
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options: {}
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}
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],
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rules: [
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<rule>
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],
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oneOf: [
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<rule>
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]
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}
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<condition>: /regExp/
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<condition>: function(arg) {}
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<condition>: "starting"
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<condition>: [<condition>] // or
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<condition>: { and: [<condition>] }
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<condition>: { or: [<condition>] }
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<condition>: { not: [<condition>] }
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<condition>: { test: <condition>, include: <condition>, exclude: <condition> }
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normalized:
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{
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resource: function(),
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resourceQuery: function(),
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compiler: function(),
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issuer: function(),
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use: [
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{
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loader: string,
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options: string,
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<any>: <any>
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}
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],
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rules: [<rule>],
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oneOf: [<rule>],
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<any>: <any>,
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}
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*/
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"use strict";
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const notMatcher = matcher => {
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return str => {
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return !matcher(str);
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};
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};
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const orMatcher = items => {
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return str => {
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for (let i = 0; i < items.length; i++) {
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if (items[i](str)) return true;
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}
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return false;
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};
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};
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const andMatcher = items => {
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return str => {
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for (let i = 0; i < items.length; i++) {
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if (!items[i](str)) return false;
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}
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return true;
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};
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};
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module.exports = class RuleSet {
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constructor(rules) {
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this.references = Object.create(null);
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this.rules = RuleSet.normalizeRules(rules, this.references, "ref-");
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}
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static normalizeRules(rules, refs, ident) {
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if (Array.isArray(rules)) {
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return rules.map((rule, idx) => {
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return RuleSet.normalizeRule(rule, refs, `${ident}-${idx}`);
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});
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} else if (rules) {
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return [RuleSet.normalizeRule(rules, refs, ident)];
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} else {
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return [];
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}
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}
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static normalizeRule(rule, refs, ident) {
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if (typeof rule === "string") {
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return {
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use: [
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{
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loader: rule
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}
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]
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};
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}
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if (!rule) {
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throw new Error("Unexcepted null when object was expected as rule");
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}
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if (typeof rule !== "object") {
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throw new Error(
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"Unexcepted " +
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typeof rule +
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" when object was expected as rule (" +
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rule +
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")"
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);
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}
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const newRule = {};
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let useSource;
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let resourceSource;
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let condition;
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const checkUseSource = newSource => {
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if (useSource && useSource !== newSource) {
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throw new Error(
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RuleSet.buildErrorMessage(
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rule,
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new Error(
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"Rule can only have one result source (provided " +
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newSource +
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" and " +
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useSource +
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")"
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)
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)
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);
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}
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useSource = newSource;
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};
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const checkResourceSource = newSource => {
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if (resourceSource && resourceSource !== newSource) {
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throw new Error(
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RuleSet.buildErrorMessage(
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rule,
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new Error(
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"Rule can only have one resource source (provided " +
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newSource +
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" and " +
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resourceSource +
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")"
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)
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)
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);
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}
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resourceSource = newSource;
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};
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if (rule.test || rule.include || rule.exclude) {
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checkResourceSource("test + include + exclude");
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condition = {
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test: rule.test,
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include: rule.include,
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exclude: rule.exclude
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};
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try {
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newRule.resource = RuleSet.normalizeCondition(condition);
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} catch (error) {
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throw new Error(RuleSet.buildErrorMessage(condition, error));
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}
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}
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if (rule.resource) {
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checkResourceSource("resource");
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try {
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newRule.resource = RuleSet.normalizeCondition(rule.resource);
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} catch (error) {
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throw new Error(RuleSet.buildErrorMessage(rule.resource, error));
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}
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}
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if (rule.realResource) {
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try {
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newRule.realResource = RuleSet.normalizeCondition(rule.realResource);
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} catch (error) {
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throw new Error(RuleSet.buildErrorMessage(rule.realResource, error));
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}
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}
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if (rule.resourceQuery) {
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try {
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newRule.resourceQuery = RuleSet.normalizeCondition(rule.resourceQuery);
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} catch (error) {
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throw new Error(RuleSet.buildErrorMessage(rule.resourceQuery, error));
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}
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}
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if (rule.compiler) {
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try {
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newRule.compiler = RuleSet.normalizeCondition(rule.compiler);
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} catch (error) {
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throw new Error(RuleSet.buildErrorMessage(rule.compiler, error));
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}
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}
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if (rule.issuer) {
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try {
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newRule.issuer = RuleSet.normalizeCondition(rule.issuer);
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} catch (error) {
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throw new Error(RuleSet.buildErrorMessage(rule.issuer, error));
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}
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}
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if (rule.loader && rule.loaders) {
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throw new Error(
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RuleSet.buildErrorMessage(
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rule,
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new Error(
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"Provided loader and loaders for rule (use only one of them)"
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)
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)
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);
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}
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const loader = rule.loaders || rule.loader;
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if (typeof loader === "string" && !rule.options && !rule.query) {
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checkUseSource("loader");
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newRule.use = RuleSet.normalizeUse(loader.split("!"), ident);
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} else if (typeof loader === "string" && (rule.options || rule.query)) {
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checkUseSource("loader + options/query");
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newRule.use = RuleSet.normalizeUse(
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{
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loader: loader,
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options: rule.options,
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query: rule.query
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},
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ident
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);
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} else if (loader && (rule.options || rule.query)) {
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throw new Error(
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RuleSet.buildErrorMessage(
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rule,
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new Error(
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"options/query cannot be used with loaders (use options for each array item)"
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)
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)
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);
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} else if (loader) {
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checkUseSource("loaders");
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newRule.use = RuleSet.normalizeUse(loader, ident);
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} else if (rule.options || rule.query) {
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throw new Error(
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RuleSet.buildErrorMessage(
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rule,
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new Error(
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"options/query provided without loader (use loader + options)"
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)
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)
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);
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}
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if (rule.use) {
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checkUseSource("use");
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newRule.use = RuleSet.normalizeUse(rule.use, ident);
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}
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if (rule.rules) {
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newRule.rules = RuleSet.normalizeRules(
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rule.rules,
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refs,
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`${ident}-rules`
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);
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}
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if (rule.oneOf) {
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newRule.oneOf = RuleSet.normalizeRules(
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rule.oneOf,
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refs,
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`${ident}-oneOf`
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);
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}
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const keys = Object.keys(rule).filter(key => {
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return ![
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"resource",
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"resourceQuery",
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"compiler",
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"test",
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"include",
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"exclude",
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"issuer",
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"loader",
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"options",
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"query",
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"loaders",
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"use",
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"rules",
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"oneOf"
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].includes(key);
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});
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for (const key of keys) {
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newRule[key] = rule[key];
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}
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if (Array.isArray(newRule.use)) {
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for (const item of newRule.use) {
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if (item.ident) {
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refs[item.ident] = item.options;
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}
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}
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}
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return newRule;
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}
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static buildErrorMessage(condition, error) {
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const conditionAsText = JSON.stringify(
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condition,
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(key, value) => {
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return value === undefined ? "undefined" : value;
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},
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2
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);
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return error.message + " in " + conditionAsText;
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}
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static normalizeUse(use, ident) {
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if (typeof use === "function") {
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return data => RuleSet.normalizeUse(use(data), ident);
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}
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if (Array.isArray(use)) {
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return use
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.map((item, idx) => RuleSet.normalizeUse(item, `${ident}-${idx}`))
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.reduce((arr, items) => arr.concat(items), []);
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}
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return [RuleSet.normalizeUseItem(use, ident)];
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}
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static normalizeUseItemString(useItemString) {
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const idx = useItemString.indexOf("?");
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if (idx >= 0) {
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return {
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loader: useItemString.substr(0, idx),
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options: useItemString.substr(idx + 1)
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};
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}
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return {
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loader: useItemString,
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options: undefined
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};
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}
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static normalizeUseItem(item, ident) {
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if (typeof item === "string") {
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return RuleSet.normalizeUseItemString(item);
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}
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const newItem = {};
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if (item.options && item.query) {
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throw new Error("Provided options and query in use");
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}
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if (!item.loader) {
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throw new Error("No loader specified");
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}
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newItem.options = item.options || item.query;
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if (typeof newItem.options === "object" && newItem.options) {
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if (newItem.options.ident) {
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newItem.ident = newItem.options.ident;
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} else {
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newItem.ident = ident;
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}
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}
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const keys = Object.keys(item).filter(function(key) {
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return !["options", "query"].includes(key);
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});
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for (const key of keys) {
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newItem[key] = item[key];
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}
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return newItem;
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}
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static normalizeCondition(condition) {
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if (!condition) throw new Error("Expected condition but got falsy value");
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if (typeof condition === "string") {
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return str => str.indexOf(condition) === 0;
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}
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if (typeof condition === "function") {
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return condition;
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}
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if (condition instanceof RegExp) {
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return condition.test.bind(condition);
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}
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if (Array.isArray(condition)) {
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const items = condition.map(c => RuleSet.normalizeCondition(c));
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return orMatcher(items);
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}
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if (typeof condition !== "object") {
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throw Error(
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"Unexcepted " +
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typeof condition +
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" when condition was expected (" +
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condition +
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")"
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);
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}
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const matchers = [];
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Object.keys(condition).forEach(key => {
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const value = condition[key];
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switch (key) {
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case "or":
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case "include":
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case "test":
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if (value) matchers.push(RuleSet.normalizeCondition(value));
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break;
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case "and":
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if (value) {
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const items = value.map(c => RuleSet.normalizeCondition(c));
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matchers.push(andMatcher(items));
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}
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break;
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case "not":
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case "exclude":
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if (value) {
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const matcher = RuleSet.normalizeCondition(value);
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matchers.push(notMatcher(matcher));
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}
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break;
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default:
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throw new Error("Unexcepted property " + key + " in condition");
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}
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});
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if (matchers.length === 0) {
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throw new Error("Excepted condition but got " + condition);
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}
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if (matchers.length === 1) {
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return matchers[0];
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}
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return andMatcher(matchers);
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}
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exec(data) {
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const result = [];
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this._run(
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data,
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{
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rules: this.rules
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},
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result
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);
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return result;
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}
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_run(data, rule, result) {
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// test conditions
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if (rule.resource && !data.resource) return false;
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if (rule.realResource && !data.realResource) return false;
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if (rule.resourceQuery && !data.resourceQuery) return false;
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if (rule.compiler && !data.compiler) return false;
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if (rule.issuer && !data.issuer) return false;
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if (rule.resource && !rule.resource(data.resource)) return false;
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if (rule.realResource && !rule.realResource(data.realResource))
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return false;
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if (data.issuer && rule.issuer && !rule.issuer(data.issuer)) return false;
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if (
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data.resourceQuery &&
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rule.resourceQuery &&
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!rule.resourceQuery(data.resourceQuery)
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) {
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return false;
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}
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if (data.compiler && rule.compiler && !rule.compiler(data.compiler)) {
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return false;
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}
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// apply
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const keys = Object.keys(rule).filter(key => {
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return ![
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"resource",
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"realResource",
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"resourceQuery",
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"compiler",
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"issuer",
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"rules",
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"oneOf",
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"use",
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"enforce"
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].includes(key);
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});
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for (const key of keys) {
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result.push({
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type: key,
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value: rule[key]
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});
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}
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if (rule.use) {
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const process = use => {
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if (typeof use === "function") {
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process(use(data));
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} else if (Array.isArray(use)) {
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use.forEach(process);
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} else {
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result.push({
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type: "use",
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value: use,
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enforce: rule.enforce
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});
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}
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};
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process(rule.use);
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}
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if (rule.rules) {
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for (let i = 0; i < rule.rules.length; i++) {
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this._run(data, rule.rules[i], result);
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}
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}
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if (rule.oneOf) {
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for (let i = 0; i < rule.oneOf.length; i++) {
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if (this._run(data, rule.oneOf[i], result)) break;
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}
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}
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return true;
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}
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findOptionsByIdent(ident) {
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const options = this.references[ident];
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if (!options) {
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throw new Error("Can't find options with ident '" + ident + "'");
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}
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return options;
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}
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};
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