/
require-computed-property-dependencies.js
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/
require-computed-property-dependencies.js
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'use strict';
const Traverser = require('../utils/traverser');
const emberUtils = require('../utils/ember');
const computedPropertyUtils = require('../utils/computed-properties');
const javascriptUtils = require('../utils/javascript');
const types = require('../utils/types');
const utils = require('../utils/utils');
const propertyGetterUtils = require('../utils/property-getter');
const computedPropertyDependentKeyUtils = require('../utils/computed-property-dependent-keys');
const assert = require('assert');
const { getImportIdentifier } = require('../utils/import');
/**
* Checks whether the node is an identifier with the given name.
*
* @param {ASTNode} node
* @param {string} name
* @returns {boolean}
*/
function isIdentifier(node, name) {
if (!types.isIdentifier(node)) {
return false;
}
return node.name === name;
}
/**
* Determines whether a node is a simple member expression with the given object
* and property.
*
* @param {ASTNode} node
* @param {string} objectName
* @param {string} propertyName
* @returns {boolean}
*/
function isMemberExpression(node, objectName, propertyName) {
return (
node &&
types.isMemberExpression(node) &&
!node.computed &&
(objectName === 'this'
? types.isThisExpression(node.object)
: isIdentifier(node.object, objectName)) &&
isIdentifier(node.property, propertyName)
);
}
/**
* @param {ASTNode} node
* @param {string} importedEmberName
* @param {string} importedComputedName
* @returns {boolean}
*/
function isEmberComputed(node, importedEmberName, importedComputedName) {
return (
isIdentifier(node, importedComputedName) ||
isMemberExpression(node, importedEmberName, 'computed')
);
}
/**
* Checks if a node looks like: 'part1' + 'part2'
*
* @param {ASTNode} node
* @returns {boolean}
*/
function isTwoPartStringLiteral(node) {
return (
types.isBinaryExpression(node) &&
types.isStringLiteral(node.left) &&
types.isStringLiteral(node.right)
);
}
/**
* Returns the string represented by the node.
*
* @param {ASTNode} node
* @returns {string}
*/
function nodeToStringValue(node) {
if (types.isStringLiteral(node)) {
return node.value;
} else if (isTwoPartStringLiteral(node)) {
return node.left.value + node.right.value;
} else {
assert(false);
return undefined;
}
}
/**
* Splits arguments to `Ember.computed` into string keys and dynamic keys.
*
* @param {Array<ASTNode>} args
* @returns {{keys: Array<ASTNode>, dynamicKeys: Array<ASTNode>}}
*/
function parseComputedDependencies(args) {
const keys = [];
const dynamicKeys = [];
for (const arg of args) {
if (types.isStringLiteral(arg) || isTwoPartStringLiteral(arg)) {
keys.push(arg);
} else if (!computedPropertyUtils.isComputedPropertyBodyArg(arg)) {
dynamicKeys.push(arg);
}
}
return { keys, dynamicKeys };
}
/**
* Recursively finds all calls to `Ember#get`, whether like `Ember.get(this, …)`
* or `this.get(…)`.
*
* @param {ASTNode} node
* @param {object} importedNames
* @returns {Array<ASTNode>}
*/
function findEmberGetCalls(node, importedNames) {
const results = [];
new Traverser().traverse(node, {
enter(child) {
if (types.isCallExpression(child)) {
const dependency = extractEmberGetDependencies(child, importedNames);
if (dependency.length > 0) {
results.push(child);
}
}
},
});
return results;
}
/**
* Recursively finds the names of all injected services.
*
* In this example: `intl` would be one of the results:
* `Component.extend({ intl: service() });`
*
* @param {ASTNode} node
* @returns {Array<String>}
*/
function findInjectedServiceNames(node) {
const results = [];
new Traverser().traverse(node, {
enter(child) {
if (
(types.isProperty(child) || types.isClassProperty(child)) &&
emberUtils.isInjectedServiceProp(child) &&
types.isIdentifier(child.key)
) {
results.push(child.key.name);
}
},
});
return results;
}
/**
* Recursively finds all `this.property` usages.
*
* @param {ASTNode} node
* @returns {Array<ASTNode>}
*/
function findThisGetCalls(node) {
const results = [];
new Traverser().traverse(node, {
enter(child, parent) {
if (
(types.isOptionalMemberExpression(child) || types.isMemberExpression(child)) &&
!(
(types.isCallExpression(parent) || types.isOptionalCallExpression(parent)) &&
parent.callee === child
) &&
!utils.isInLeftSideOfAssignmentExpression(child) && // Ignore the left side (x) of an assignment: this.x = 123;
propertyGetterUtils.isSimpleThisExpression(child)
) {
results.push(child);
}
},
});
return results;
}
/**
* Get an array argument's elements or the rest params if the values were not
* passed as a single array argument.
*
* @param {Array<ASTNode>} args
* @returns {Array<ASTNode>}
*/
function getArrayOrRest(args) {
if (args.length === 1 && types.isArrayExpression(args[0])) {
return args[0].elements;
}
return args;
}
/**
* Extracts all static property keys used in the various forms of `Ember.get`.
*
* @param {ASTNode} call
* @param {object} importedNames
* @returns {Array<string>}
*/
function extractEmberGetDependencies(
call,
{ importedEmberName, importedGetName, importedGetPropertiesName, importedGetWithDefaultName }
) {
if (
isMemberExpression(call.callee, 'this', 'get') ||
isMemberExpression(call.callee, 'this', 'getWithDefault')
) {
const firstArg = call.arguments[0];
if (types.isStringLiteral(firstArg)) {
return [firstArg.value];
}
} else if (
isMemberExpression(call.callee, importedEmberName, 'get') ||
isMemberExpression(call.callee, importedEmberName, 'getWithDefault') ||
isIdentifier(call.callee, importedGetName) ||
isIdentifier(call.callee, importedGetWithDefaultName)
) {
const firstArg = call.arguments[0];
const secondArgument = call.arguments[1];
if (types.isThisExpression(firstArg) && types.isStringLiteral(secondArgument)) {
return [secondArgument.value];
}
} else if (isMemberExpression(call.callee, 'this', 'getProperties')) {
return getArrayOrRest(call.arguments)
.filter(types.isStringLiteral)
.map((arg) => arg.value);
} else if (
isMemberExpression(call.callee, importedEmberName, 'getProperties') ||
isIdentifier(call.callee, importedGetPropertiesName)
) {
const firstArg = call.arguments[0];
const rest = call.arguments.slice(1);
if (types.isThisExpression(firstArg)) {
return getArrayOrRest(rest)
.filter(types.isStringLiteral)
.map((arg) => arg.value);
}
}
return [];
}
function extractThisGetDependencies(memberExpression, context) {
return propertyGetterUtils.nodeToDependentKey(memberExpression, context);
}
function removeRedundantKeys(keys) {
return keys.filter(
(currentKey) => !computedPropertyDependentKeyUtils.keyExistsAsPrefixInList(keys, currentKey)
);
}
function removeServiceNames(keys, serviceNames) {
if (!serviceNames || serviceNames.length === 0) {
return keys;
}
return keys.filter((key) => !serviceNames.includes(key));
}
const ERROR_MESSAGE_NON_STRING_VALUE = 'Non-string value used as computed property dependency';
module.exports = {
meta: {
type: 'problem',
docs: {
description: 'require dependencies to be declared statically in computed properties',
category: 'Computed Properties',
recommended: true,
url:
'https://github.com/ember-cli/eslint-plugin-ember/tree/master/docs/rules/require-computed-property-dependencies.md',
},
fixable: 'code',
schema: [
{
type: 'object',
properties: {
allowDynamicKeys: {
type: 'boolean',
default: true,
},
requireServiceNames: {
type: 'boolean',
default: false,
},
},
additionalProperties: false,
},
],
},
ERROR_MESSAGE_NON_STRING_VALUE,
create(context) {
// Options:
const requireServiceNames = context.options[0] && context.options[0].requireServiceNames;
const allowDynamicKeys = !context.options[0] || context.options[0].allowDynamicKeys;
let serviceNames = [];
let importedEmberName;
let importedComputedName;
let importedGetName;
let importedGetPropertiesName;
let importedGetWithDefaultName;
function checkComputedDependencies(node, nodeArguments, importedNames) {
const declaredDependencies = parseComputedDependencies(nodeArguments);
if (!allowDynamicKeys) {
declaredDependencies.dynamicKeys.forEach((key) => {
context.report({
node: key,
message: ERROR_MESSAGE_NON_STRING_VALUE,
});
});
}
const computedPropertyFunctionBody = computedPropertyUtils.getComputedPropertyFunctionBody(
node
);
const usedKeys1 = javascriptUtils.flatMap(
findEmberGetCalls(computedPropertyFunctionBody, importedNames),
(node) => extractEmberGetDependencies(node, importedNames)
);
const usedKeys2 = javascriptUtils.flatMap(
findThisGetCalls(computedPropertyFunctionBody),
(node) => extractThisGetDependencies(node, context)
);
const usedKeys = [...usedKeys1, ...usedKeys2];
const expandedDeclaredKeys = computedPropertyDependentKeyUtils.expandKeys(
declaredDependencies.keys.map(nodeToStringValue)
);
const undeclaredKeysBeforeServiceCheck = removeRedundantKeys(
usedKeys
.filter((usedKey) =>
expandedDeclaredKeys.every(
(declaredKey) =>
declaredKey !== usedKey &&
!computedPropertyDependentKeyUtils.computedPropertyDependencyMatchesKeyPath(
declaredKey,
usedKey
)
)
)
.reduce((keys, key) => {
if (!keys.includes(key)) {
keys.push(key);
}
return keys;
}, [])
.sort()
);
const undeclaredKeys = requireServiceNames
? undeclaredKeysBeforeServiceCheck
: removeServiceNames(undeclaredKeysBeforeServiceCheck, serviceNames);
if (undeclaredKeys.length > 0) {
context.report({
node,
message: 'Use of undeclared dependencies in computed property: {{undeclaredKeys}}',
data: { undeclaredKeys: undeclaredKeys.join(', ') },
fix(fixer) {
const sourceCode = context.getSourceCode();
const missingDependenciesAsArgumentsForDynamicKeys = declaredDependencies.dynamicKeys.map(
(dynamicKey) => sourceCode.getText(dynamicKey)
);
const missingDependenciesAsArgumentsForStringKeys = computedPropertyDependentKeyUtils.collapseKeys(
removeRedundantKeys([...undeclaredKeys, ...expandedDeclaredKeys])
);
const missingDependenciesAsArguments = [
...missingDependenciesAsArgumentsForDynamicKeys,
...missingDependenciesAsArgumentsForStringKeys,
].join(', ');
if (nodeArguments.length > 0) {
const lastArg = node.arguments[node.arguments.length - 1];
if (computedPropertyUtils.isComputedPropertyBodyArg(lastArg)) {
if (node.arguments.length > 1) {
const firstDependency = node.arguments[0];
const lastDependency = node.arguments[node.arguments.length - 2];
// Replace the dependent keys before the function body argument.
// Before: computed('first', function() {})
// After: computed('first', 'last', function() {})
return fixer.replaceTextRange(
[firstDependency.range[0], lastDependency.range[1]],
missingDependenciesAsArguments
);
} else {
// Add dependent keys before the function body argument.
// Before: computed(function() {})
// After: computed('key', function() {})
return fixer.insertTextBefore(lastArg, `${missingDependenciesAsArguments}, `);
}
} else {
// All arguments are dependent keys, so replace them all.
// Before: @computed('first')
// After: @computed('first', 'last')
const firstDependency = nodeArguments[0];
const lastDependency = lastArg;
return fixer.replaceTextRange(
[firstDependency.range[0], lastDependency.range[1]],
missingDependenciesAsArguments
);
}
} else {
const nodeText = sourceCode.getText(node);
if (types.isCallExpression(node)) {
// Insert dependencies inside empty parenthesis.
// Before: @computed()
// After: @computed('first')
const positionAfterParenthesis = node.range[0] + nodeText.indexOf('(') + 1;
return fixer.insertTextAfterRange(
[node.range[0], positionAfterParenthesis],
missingDependenciesAsArguments
);
} else {
// Add dependencies with parentheses.
// Before: @computed
// After: @computed('first')
return fixer.insertTextAfterRange(
[node.range[0], node.range[0] + nodeText.length],
`(${missingDependenciesAsArguments})`
);
}
}
},
});
}
}
return {
Program(node) {
// If service names aren't required dependencies, then we need to keep track of them so that we can ignore them.
serviceNames = requireServiceNames ? [] : findInjectedServiceNames(node);
},
ImportDeclaration(node) {
if (node.source.value === 'ember') {
importedEmberName = importedEmberName || getImportIdentifier(node, 'ember');
}
if (node.source.value === '@ember/object') {
importedComputedName =
importedComputedName || getImportIdentifier(node, '@ember/object', 'computed');
importedGetName = importedGetName || getImportIdentifier(node, '@ember/object', 'get');
importedGetPropertiesName =
importedGetPropertiesName ||
getImportIdentifier(node, '@ember/object', 'getProperties');
importedGetWithDefaultName =
importedGetWithDefaultName ||
getImportIdentifier(node, '@ember/object', 'getWithDefault');
}
},
Identifier(node) {
if (isEmberComputed(node, importedEmberName, importedComputedName)) {
checkComputedDependencies(node, [], {
importedEmberName,
importedGetName,
importedGetPropertiesName,
importedGetWithDefaultName,
});
}
},
CallExpression(node) {
if (isEmberComputed(node.callee, importedEmberName, importedComputedName)) {
checkComputedDependencies(node, node.arguments, {
importedEmberName,
importedGetName,
importedGetPropertiesName,
importedGetWithDefaultName,
});
}
},
};
},
};