puppeteer/utils/doclint/check_public_api/index.js

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/**
* Copyright 2017 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const jsBuilder = require('./JSBuilder');
const mdBuilder = require('./MDBuilder');
const Documentation = require('./Documentation');
const Message = require('../Message');
const EXCLUDE_PROPERTIES = new Set([
'Browser.create',
'Headers.fromPayload',
'Page.create',
'JSHandle.toString',
'TimeoutError.name',
/* This isn't an actual property, but a TypeScript generic.
* DocLint incorrectly parses it as a property.
*/
'ElementHandle.ElementType',
]);
/**
* @param {!Page} page
* @param {!Array<!Source>} mdSources
* @returns {!Promise<!Array<!Message>>}
*/
module.exports = async function lint(page, mdSources, jsSources) {
const mdResult = await mdBuilder(page, mdSources);
const jsResult = await jsBuilder(jsSources);
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const jsDocumentation = filterJSDocumentation(
jsSources,
jsResult.documentation
);
const mdDocumentation = mdResult.documentation;
const jsErrors = jsResult.errors;
jsErrors.push(...checkDuplicates(jsDocumentation));
const mdErrors = mdResult.errors;
mdErrors.push(...compareDocumentations(mdDocumentation, jsDocumentation));
mdErrors.push(...checkDuplicates(mdDocumentation));
mdErrors.push(...checkSorting(mdDocumentation));
// Push all errors with proper prefixes
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const errors = jsErrors.map((error) => '[JavaScript] ' + error);
errors.push(...mdErrors.map((error) => '[MarkDown] ' + error));
return errors.map((error) => Message.error(error));
};
/**
* @param {!Documentation} doc
* @returns {!Array<string>}
*/
function checkSorting(doc) {
const errors = [];
for (const cls of doc.classesArray) {
const members = cls.membersArray;
// Events should go first.
let eventIndex = 0;
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for (
;
eventIndex < members.length && members[eventIndex].kind === 'event';
++eventIndex
);
for (
;
eventIndex < members.length && members[eventIndex].kind !== 'event';
++eventIndex
);
if (eventIndex < members.length)
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errors.push(
`Events should go first. Event '${members[eventIndex].name}' in class ${cls.name} breaks order`
);
// Constructor should be right after events and before all other members.
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const constructorIndex = members.findIndex(
(member) => member.kind === 'method' && member.name === 'constructor'
);
if (constructorIndex > 0 && members[constructorIndex - 1].kind !== 'event')
errors.push(`Constructor of ${cls.name} should go before other methods`);
// Events should be sorted alphabetically.
for (let i = 0; i < members.length - 1; ++i) {
const member1 = cls.membersArray[i];
const member2 = cls.membersArray[i + 1];
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if (member1.kind !== 'event' || member2.kind !== 'event') continue;
if (member1.name > member2.name)
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errors.push(
`Event '${member1.name}' in class ${cls.name} breaks alphabetic ordering of events`
);
}
// All other members should be sorted alphabetically.
for (let i = 0; i < members.length - 1; ++i) {
const member1 = cls.membersArray[i];
const member2 = cls.membersArray[i + 1];
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if (member1.kind === 'event' || member2.kind === 'event') continue;
if (member1.kind === 'method' && member1.name === 'constructor') continue;
if (member1.name > member2.name) {
let memberName1 = `${cls.name}.${member1.name}`;
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if (member1.kind === 'method') memberName1 += '()';
let memberName2 = `${cls.name}.${member2.name}`;
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if (member2.kind === 'method') memberName2 += '()';
errors.push(
`Bad alphabetic ordering of ${cls.name} members: ${memberName1} should go after ${memberName2}`
);
}
}
}
return errors;
}
/**
* @param {!Array<!Source>} jsSources
* @param {!Documentation} jsDocumentation
* @returns {!Documentation}
*/
function filterJSDocumentation(jsSources, jsDocumentation) {
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const apijs = jsSources.find((source) => source.name() === 'api.js');
let includedClasses = null;
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if (apijs) includedClasses = new Set(Object.keys(require(apijs.filePath())));
// Filter private classes and methods.
const classes = [];
for (const cls of jsDocumentation.classesArray) {
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if (includedClasses && !includedClasses.has(cls.name)) continue;
const members = cls.membersArray.filter(
(member) => !EXCLUDE_PROPERTIES.has(`${cls.name}.${member.name}`)
);
classes.push(new Documentation.Class(cls.name, members));
}
return new Documentation(classes);
}
/**
* @param {!Documentation} doc
* @returns {!Array<string>}
*/
function checkDuplicates(doc) {
const errors = [];
const classes = new Set();
// Report duplicates.
for (const cls of doc.classesArray) {
if (classes.has(cls.name))
errors.push(`Duplicate declaration of class ${cls.name}`);
classes.add(cls.name);
const members = new Set();
for (const member of cls.membersArray) {
if (members.has(member.kind + ' ' + member.name))
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errors.push(
`Duplicate declaration of ${member.kind} ${cls.name}.${member.name}()`
);
members.add(member.kind + ' ' + member.name);
const args = new Set();
for (const arg of member.argsArray) {
if (args.has(arg.name))
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errors.push(
`Duplicate declaration of argument ${cls.name}.${member.name} "${arg.name}"`
);
args.add(arg.name);
}
}
}
return errors;
}
// All the methods from our EventEmitter that we don't document for each subclass.
const EVENT_LISTENER_METHODS = new Set([
'emit',
'listenerCount',
'off',
'on',
'once',
'removeListener',
'addListener',
'removeAllListeners',
]);
/* Methods that are defined in code but are not documented */
const expectedNotFoundMethods = new Map([
['Browser', EVENT_LISTENER_METHODS],
['BrowserContext', EVENT_LISTENER_METHODS],
['CDPSession', EVENT_LISTENER_METHODS],
['Page', EVENT_LISTENER_METHODS],
['WebWorker', EVENT_LISTENER_METHODS],
]);
/**
* @param {!Documentation} actual
* @param {!Documentation} expected
* @returns {!Array<string>}
*/
function compareDocumentations(actual, expected) {
const errors = [];
const actualClasses = Array.from(actual.classes.keys()).sort();
const expectedClasses = Array.from(expected.classes.keys()).sort();
const classesDiff = diff(actualClasses, expectedClasses);
for (const className of classesDiff.extra)
errors.push(`Non-existing class found: ${className}`);
for (const className of classesDiff.missing)
errors.push(`Class not found: ${className}`);
for (const className of classesDiff.equal) {
const actualClass = actual.classes.get(className);
const expectedClass = expected.classes.get(className);
const actualMethods = Array.from(actualClass.methods.keys()).sort();
const expectedMethods = Array.from(expectedClass.methods.keys()).sort();
const methodDiff = diff(actualMethods, expectedMethods);
for (const methodName of methodDiff.extra) {
errors.push(`Non-existing method found: ${className}.${methodName}()`);
}
for (const methodName of methodDiff.missing) {
const missingMethodsForClass = expectedNotFoundMethods.get(className);
if (missingMethodsForClass && missingMethodsForClass.has(methodName))
continue;
errors.push(`Method not found: ${className}.${methodName}()`);
}
for (const methodName of methodDiff.equal) {
const actualMethod = actualClass.methods.get(methodName);
const expectedMethod = expectedClass.methods.get(methodName);
if (!actualMethod.type !== !expectedMethod.type) {
if (actualMethod.type)
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errors.push(
`Method ${className}.${methodName} has unneeded description of return type`
);
else
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errors.push(
`Method ${className}.${methodName} is missing return type description`
);
} else if (actualMethod.hasReturn) {
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checkType(
`Method ${className}.${methodName} has the wrong return type: `,
actualMethod.type,
expectedMethod.type
);
}
const actualArgs = Array.from(actualMethod.args.keys());
const expectedArgs = Array.from(expectedMethod.args.keys());
const argsDiff = diff(actualArgs, expectedArgs);
if (argsDiff.extra.length || argsDiff.missing.length) {
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const text = [
`Method ${className}.${methodName}() fails to describe its parameters:`,
];
for (const arg of argsDiff.missing)
text.push(`- Argument not found: ${arg}`);
for (const arg of argsDiff.extra)
text.push(`- Non-existing argument found: ${arg}`);
errors.push(text.join('\n'));
}
for (const arg of argsDiff.equal)
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checkProperty(
`Method ${className}.${methodName}()`,
actualMethod.args.get(arg),
expectedMethod.args.get(arg)
);
}
const actualProperties = Array.from(actualClass.properties.keys()).sort();
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const expectedProperties = Array.from(
expectedClass.properties.keys()
).sort();
const propertyDiff = diff(actualProperties, expectedProperties);
for (const propertyName of propertyDiff.extra)
errors.push(`Non-existing property found: ${className}.${propertyName}`);
for (const propertyName of propertyDiff.missing)
errors.push(`Property not found: ${className}.${propertyName}`);
const actualEvents = Array.from(actualClass.events.keys()).sort();
const expectedEvents = Array.from(expectedClass.events.keys()).sort();
const eventsDiff = diff(actualEvents, expectedEvents);
for (const eventName of eventsDiff.extra)
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errors.push(
`Non-existing event found in class ${className}: '${eventName}'`
);
for (const eventName of eventsDiff.missing)
errors.push(`Event not found in class ${className}: '${eventName}'`);
}
/**
* @param {string} source
* @param {!Documentation.Member} actual
* @param {!Documentation.Member} expected
*/
function checkProperty(source, actual, expected) {
checkType(source + ' ' + actual.name, actual.type, expected.type);
}
/**
* @param {string} source
* @param {!string} actualName
* @param {!string} expectedName
*/
function namingMisMatchInTypeIsExpected(source, actualName, expectedName) {
/* The DocLint tooling doesn't deal well with generics in TypeScript
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* source files. We could fix this but the longterm plan is to
* auto-generate documentation from TS. So instead we document here
* the methods that use generics that DocLint trips up on and if it
* finds a mismatch that matches one of the cases below it doesn't
* error. This still means we're protected from accidental changes, as
* if the mismatch doesn't exactly match what's described below
* DocLint will fail.
*/
const expectedNamingMismatches = new Map([
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[
'Method CDPSession.send() method',
{
actualName: 'string',
expectedName: 'T',
},
],
[
'Method CDPSession.send() params',
{
actualName: 'Object',
expectedName: 'CommandParameters[T]',
},
],
[
'Method ElementHandle.click() options',
{
actualName: 'Object',
expectedName: 'ClickOptions',
},
],
[
'Method ElementHandle.press() options',
{
actualName: 'Object',
expectedName: 'PressOptions',
},
],
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[
'Method ElementHandle.press() key',
{
actualName: 'string',
expectedName: 'KeyInput',
},
],
[
'Method Keyboard.down() key',
{
actualName: 'string',
expectedName: 'KeyInput',
},
],
[
'Method Keyboard.press() key',
{
actualName: 'string',
expectedName: 'KeyInput',
},
],
[
'Method Keyboard.up() key',
{
actualName: 'string',
expectedName: 'KeyInput',
},
],
[
'Method Mouse.down() options',
{
actualName: 'Object',
expectedName: 'MouseOptions',
},
],
[
'Method Mouse.up() options',
{
actualName: 'Object',
expectedName: 'MouseOptions',
},
],
[
'Method Tracing.start() options',
{
actualName: 'Object',
expectedName: 'TracingOptions',
},
],
[
'Method Frame.waitForSelector() options',
{
actualName: 'Object',
expectedName: 'WaitForSelectorOptions',
},
],
[
'Method Frame.waitForXPath() options',
{
actualName: 'Object',
expectedName: 'WaitForSelectorOptions',
},
],
[
'Method HTTPRequest.abort() errorCode',
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{
actualName: 'string',
expectedName: 'ErrorCode',
},
],
[
'Method Frame.goto() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Frame.waitForNavigation() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Frame.setContent() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Puppeteer.defaultArgs() options',
{
actualName: 'Object',
expectedName: 'ChromeArgOptions',
},
],
[
'Method Page.goBack() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Page.goForward() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Page.goto() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Page.reload() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Page.setContent() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method Page.waitForNavigation() options.waitUntil',
{
actualName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
expectedName:
'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
},
],
[
'Method BrowserContext.overridePermissions() permissions',
{
actualName: 'Array<string>',
expectedName: 'Array<PermissionType>',
},
],
[
'Method Puppeteer.createBrowserFetcher() options',
{
actualName: 'Object',
expectedName: 'BrowserFetcherOptions',
},
],
[
'Method Page.authenticate() credentials',
{
actualName: 'Object',
expectedName: 'Credentials',
},
],
[
'Method Page.emulateMediaFeatures() features',
{
actualName: 'Array<Object>',
expectedName: 'Array<MediaFeature>',
},
],
[
'Method Page.emulate() options.viewport',
{
actualName: 'Object',
expectedName: 'Viewport',
},
],
[
'Method Page.setViewport() options.viewport',
{
actualName: 'Object',
expectedName: 'Viewport',
},
],
[
'Method Page.setViewport() viewport',
{
actualName: 'Object',
expectedName: 'Viewport',
},
],
[
'Method Page.connect() options.defaultViewport',
{
actualName: 'Object',
expectedName: 'Viewport',
},
],
[
'Method Puppeteer.connect() options.defaultViewport',
{
actualName: 'Object',
expectedName: 'Viewport',
},
],
[
'Method Puppeteer.launch() options.defaultViewport',
{
actualName: 'Object',
expectedName: 'Viewport',
},
],
[
'Method Page.launch() options.defaultViewport',
{
actualName: 'Object',
expectedName: 'Viewport',
},
],
[
'Method Page.goBack() options',
{
actualName: 'Object',
expectedName: 'WaitForOptions',
},
],
[
'Method Page.goForward() options',
{
actualName: 'Object',
expectedName: 'WaitForOptions',
},
],
[
'Method Page.reload() options',
{
actualName: 'Object',
expectedName: 'WaitForOptions',
},
],
[
'Method Page.waitForNavigation() options',
{
actualName: 'Object',
expectedName: 'WaitForOptions',
},
],
[
'Method Page.pdf() options',
{
actualName: 'Object',
expectedName: 'PDFOptions',
},
],
[
'Method Page.screenshot() options',
{
actualName: 'Object',
expectedName: 'ScreenshotOptions',
},
],
[
'Method Page.setContent() options',
{
actualName: 'Object',
expectedName: 'WaitForOptions',
},
],
[
'Method Page.setCookie() ...cookies',
{
actualName: '...Object',
expectedName: '...CookieParam',
},
],
[
'Method Page.emulateVisionDeficiency() type',
{
actualName: 'string',
expectedName: 'VisionDeficiency',
},
],
[
'Method Accessibility.snapshot() options',
{
actualName: 'Object',
expectedName: 'SnapshotOptions',
},
],
[
'Method Browser.waitForTarget() options',
{
actualName: 'Object',
expectedName: 'WaitForTargetOptions',
},
],
[
'Method EventEmitter.emit() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method EventEmitter.listenerCount() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method EventEmitter.off() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method EventEmitter.on() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method EventEmitter.once() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method EventEmitter.removeListener() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method EventEmitter.addListener() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method EventEmitter.removeAllListeners() event',
{
actualName: 'string|symbol',
expectedName: 'Object',
},
],
[
'Method Coverage.startCSSCoverage() options',
{
actualName: 'Object',
expectedName: 'CSSCoverageOptions',
},
],
[
'Method Coverage.startJSCoverage() options',
{
actualName: 'Object',
expectedName: 'JSCoverageOptions',
},
],
[
'Method Mouse.click() options.button',
{
actualName: '"left"|"right"|"middle"',
expectedName: 'MouseButton',
},
],
[
'Method Frame.click() options.button',
{
actualName: '"left"|"right"|"middle"',
expectedName: 'MouseButton',
},
],
[
'Method Page.click() options.button',
{
actualName: '"left"|"right"|"middle"',
expectedName: 'MouseButton',
},
],
[
'Method HTTPRequest.continue() overrides',
{
actualName: 'Object',
expectedName: 'ContinueRequestOverrides',
},
],
[
'Method HTTPRequest.respond() response',
{
actualName: 'Object',
expectedName: 'ResponseForRequest',
},
],
]);
const expectedForSource = expectedNamingMismatches.get(source);
if (!expectedForSource) return false;
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const namingMismatchIsExpected =
expectedForSource.actualName === actualName &&
expectedForSource.expectedName === expectedName;
return namingMismatchIsExpected;
}
/**
* @param {string} source
* @param {!Documentation.Type} actual
* @param {!Documentation.Type} expected
*/
function checkType(source, actual, expected) {
// TODO(@JoelEinbinder): check functions and Serializable
if (actual.name.includes('unction') || actual.name.includes('Serializable'))
return;
// We don't have nullchecks on for TypeScript
const actualName = actual.name.replace(/[\? ]/g, '');
// TypeScript likes to add some spaces
const expectedName = expected.name.replace(/\ /g, '');
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const namingMismatchIsExpected = namingMisMatchInTypeIsExpected(
source,
actualName,
expectedName
);
if (expectedName !== actualName && !namingMismatchIsExpected)
errors.push(`${source} ${actualName} != ${expectedName}`);
/* If we got a naming mismatch and it was expected, don't check the properties
* as they will likely be considered "wrong" by DocLint too.
*/
if (namingMismatchIsExpected) return;
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const actualPropertiesMap = new Map(
actual.properties.map((property) => [property.name, property.type])
);
const expectedPropertiesMap = new Map(
expected.properties.map((property) => [property.name, property.type])
);
const propertiesDiff = diff(
Array.from(actualPropertiesMap.keys()).sort(),
Array.from(expectedPropertiesMap.keys()).sort()
);
for (const propertyName of propertiesDiff.extra)
errors.push(`${source} has unexpected property ${propertyName}`);
for (const propertyName of propertiesDiff.missing)
errors.push(`${source} is missing property ${propertyName}`);
for (const propertyName of propertiesDiff.equal)
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checkType(
source + '.' + propertyName,
actualPropertiesMap.get(propertyName),
expectedPropertiesMap.get(propertyName)
);
}
return errors;
}
/**
* @param {!Array<string>} actual
* @param {!Array<string>} expected
* @returns {{extra: !Array<string>, missing: !Array<string>, equal: !Array<string>}}
*/
function diff(actual, expected) {
const N = actual.length;
const M = expected.length;
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if (N === 0 && M === 0) return { extra: [], missing: [], equal: [] };
if (N === 0) return { extra: [], missing: expected.slice(), equal: [] };
if (M === 0) return { extra: actual.slice(), missing: [], equal: [] };
const d = new Array(N);
const bt = new Array(N);
for (let i = 0; i < N; ++i) {
d[i] = new Array(M);
bt[i] = new Array(M);
for (let j = 0; j < M; ++j) {
const top = val(i - 1, j);
const left = val(i, j - 1);
if (top > left) {
d[i][j] = top;
bt[i][j] = 'extra';
} else {
d[i][j] = left;
bt[i][j] = 'missing';
}
const diag = val(i - 1, j - 1);
if (actual[i] === expected[j] && d[i][j] < diag + 1) {
d[i][j] = diag + 1;
bt[i][j] = 'eq';
}
}
}
// Backtrack results.
let i = N - 1;
let j = M - 1;
const missing = [];
const extra = [];
const equal = [];
while (i >= 0 && j >= 0) {
switch (bt[i][j]) {
case 'extra':
extra.push(actual[i]);
i -= 1;
break;
case 'missing':
missing.push(expected[j]);
j -= 1;
break;
case 'eq':
equal.push(actual[i]);
i -= 1;
j -= 1;
break;
}
}
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while (i >= 0) extra.push(actual[i--]);
while (j >= 0) missing.push(expected[j--]);
extra.reverse();
missing.reverse();
equal.reverse();
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return { extra, missing, equal };
function val(i, j) {
return i < 0 || j < 0 ? 0 : d[i][j];
}
}