445 lines
11 KiB
JavaScript
445 lines
11 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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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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loader: rule
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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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if(typeof rule !== "object")
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throw new Error("Unexcepted " + typeof rule + " when object was expected as rule (" + rule + ")");
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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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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.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(RuleSet.buildErrorMessage(rule, new Error("Provided loader and loaders for rule (use only one of them)")));
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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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loader: loader,
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options: rule.options,
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query: rule.query
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}, ident);
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} else if(loader && (rule.options || rule.query)) {
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throw new Error(RuleSet.buildErrorMessage(rule, new Error("options/query cannot be used with loaders (use options for each array item)")));
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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(RuleSet.buildErrorMessage(rule, new Error("options/query provided without loader (use loader + options)")));
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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(rule.rules, refs, `${ident}-rules`);
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if(rule.oneOf)
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newRule.oneOf = RuleSet.normalizeRules(rule.oneOf, refs, `${ident}-oneOf`);
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const keys = Object.keys(rule).filter((key) => {
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return ["resource", "resourceQuery", "compiler", "test", "include", "exclude", "issuer", "loader", "options", "query", "loaders", "use", "rules", "oneOf"].indexOf(key) < 0;
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});
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keys.forEach((key) => {
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newRule[key] = rule[key];
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});
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function checkUseSource(newSource) {
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if(useSource && useSource !== newSource)
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throw new Error(RuleSet.buildErrorMessage(rule, new Error("Rule can only have one result source (provided " + newSource + " and " + useSource + ")")));
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useSource = newSource;
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}
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function checkResourceSource(newSource) {
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if(resourceSource && resourceSource !== newSource)
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throw new Error(RuleSet.buildErrorMessage(rule, new Error("Rule can only have one resource source (provided " + newSource + " and " + resourceSource + ")")));
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resourceSource = newSource;
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}
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if(Array.isArray(newRule.use)) {
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newRule.use.forEach((item) => {
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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(condition, (key, value) => {
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return value === undefined ? "undefined" : value;
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}, 2);
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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(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 normalizeUseItemFunction(use, data) {
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const result = use(data);
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if(typeof result === "string") {
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return RuleSet.normalizeUseItem(result);
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}
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return result;
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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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};
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}
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static normalizeUseItem(item, ident) {
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if(typeof item === "function")
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return item;
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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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if(!item.loader)
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throw new Error("No loader specified");
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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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const keys = Object.keys(item).filter(function(key) {
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return ["options", "query"].indexOf(key) < 0;
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});
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keys.forEach(function(key) {
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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)
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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("Unexcepted " + typeof condition + " when condition was expected (" + condition + ")");
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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)
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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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if(matchers.length === 1)
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return matchers[0];
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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(data, {
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rules: this.rules
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}, result);
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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)
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return false;
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if(rule.resourceQuery && !data.resourceQuery)
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return false;
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if(rule.compiler && !data.compiler)
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return false;
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if(rule.issuer && !data.issuer)
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return false;
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if(rule.resource && !rule.resource(data.resource))
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return false;
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if(data.issuer && rule.issuer && !rule.issuer(data.issuer))
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return false;
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if(data.resourceQuery && rule.resourceQuery && !rule.resourceQuery(data.resourceQuery))
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return false;
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if(data.compiler && rule.compiler && !rule.compiler(data.compiler))
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return false;
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// apply
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const keys = Object.keys(rule).filter((key) => {
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return ["resource", "resourceQuery", "compiler", "issuer", "rules", "oneOf", "use", "enforce"].indexOf(key) < 0;
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});
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keys.forEach((key) => {
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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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rule.use.forEach((use) => {
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result.push({
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type: "use",
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value: typeof use === "function" ? RuleSet.normalizeUseItemFunction(use, data) : use,
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enforce: rule.enforce
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});
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});
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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))
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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) throw new Error("Can't find options with ident '" + ident + "'");
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return options;
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}
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};
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function notMatcher(matcher) {
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return function(str) {
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return !matcher(str);
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};
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}
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function orMatcher(items) {
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return function(str) {
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for(let i = 0; i < items.length; i++) {
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if(items[i](str))
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return true;
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}
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return false;
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};
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}
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function andMatcher(items) {
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return function(str) {
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for(let i = 0; i < items.length; i++) {
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if(!items[i](str))
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return false;
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}
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return true;
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};
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}
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