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