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code-server/build/lib/eslint/code-no-unexternalized-strings.ts

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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as eslint from 'eslint';
import { TSESTree, AST_NODE_TYPES } from '@typescript-eslint/experimental-utils';
function isStringLiteral(node: TSESTree.Node | null | undefined): node is TSESTree.StringLiteral {
return !!node && node.type === AST_NODE_TYPES.Literal && typeof node.value === 'string';
}
function isDoubleQuoted(node: TSESTree.StringLiteral): boolean {
return node.raw[0] === '"' && node.raw[node.raw.length - 1] === '"';
}
export = new class NoUnexternalizedStrings implements eslint.Rule.RuleModule {
private static _rNlsKeys = /^[_a-zA-Z0-9][ .\-_a-zA-Z0-9]*$/;
readonly meta: eslint.Rule.RuleMetaData = {
messages: {
doubleQuoted: 'Only use double-quoted strings for externalized strings.',
badKey: 'The key \'{{key}}\' doesn\'t conform to a valid localize identifier.',
duplicateKey: 'Duplicate key \'{{key}}\' with different message value.',
badMessage: 'Message argument to \'{{message}}\' must be a string literal.'
}
};
create(context: eslint.Rule.RuleContext): eslint.Rule.RuleListener {
const externalizedStringLiterals = new Map<string, { call: TSESTree.CallExpression, message: TSESTree.Node }[]>();
const doubleQuotedStringLiterals = new Set<TSESTree.Node>();
function collectDoubleQuotedStrings(node: TSESTree.Literal) {
if (isStringLiteral(node) && isDoubleQuoted(node)) {
doubleQuotedStringLiterals.add(node);
}
}
function visitLocalizeCall(node: TSESTree.CallExpression) {
// localize(key, message)
const [keyNode, messageNode] = (<TSESTree.CallExpression>node).arguments;
// (1)
// extract key so that it can be checked later
let key: string | undefined;
if (isStringLiteral(keyNode)) {
doubleQuotedStringLiterals.delete(keyNode); //todo@joh reconsider
key = keyNode.value;
} else if (keyNode.type === AST_NODE_TYPES.ObjectExpression) {
for (let property of keyNode.properties) {
if (property.type === AST_NODE_TYPES.Property && !property.computed) {
if (property.key.type === AST_NODE_TYPES.Identifier && property.key.name === 'key') {
if (isStringLiteral(property.value)) {
doubleQuotedStringLiterals.delete(property.value); //todo@joh reconsider
key = property.value.value;
break;
}
}
}
}
}
if (typeof key === 'string') {
let array = externalizedStringLiterals.get(key);
if (!array) {
array = [];
externalizedStringLiterals.set(key, array);
}
array.push({ call: node, message: messageNode });
}
// (2)
// remove message-argument from doubleQuoted list and make
// sure it is a string-literal
doubleQuotedStringLiterals.delete(messageNode);
if (!isStringLiteral(messageNode)) {
context.report({
loc: messageNode.loc,
messageId: 'badMessage',
data: { message: context.getSourceCode().getText(<any>node) }
});
}
}
function reportBadStringsAndBadKeys() {
// (1)
// report all strings that are in double quotes
for (const node of doubleQuotedStringLiterals) {
context.report({ loc: node.loc, messageId: 'doubleQuoted' });
}
for (const [key, values] of externalizedStringLiterals) {
// (2)
// report all invalid NLS keys
if (!key.match(NoUnexternalizedStrings._rNlsKeys)) {
for (let value of values) {
context.report({ loc: value.call.loc, messageId: 'badKey', data: { key } });
}
}
// (2)
// report all invalid duplicates (same key, different message)
if (values.length > 1) {
for (let i = 1; i < values.length; i++) {
if (context.getSourceCode().getText(<any>values[i - 1].message) !== context.getSourceCode().getText(<any>values[i].message)) {
context.report({ loc: values[i].call.loc, messageId: 'duplicateKey', data: { key } });
}
}
}
}
}
return {
['Literal']: (node: any) => collectDoubleQuotedStrings(node),
['ExpressionStatement[directive] Literal:exit']: (node: any) => doubleQuotedStringLiterals.delete(node),
['CallExpression[callee.type="MemberExpression"][callee.object.name="nls"][callee.property.name="localize"]:exit']: (node: any) => visitLocalizeCall(node),
['CallExpression[callee.name="localize"][arguments.length>=2]:exit']: (node: any) => visitLocalizeCall(node),
['Program:exit']: reportBadStringsAndBadKeys,
};
}
};