794 lines
23 KiB
JavaScript
794 lines
23 KiB
JavaScript
"use strict";
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const assert = require("assert");
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const util = require("../common/util");
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const comments = require("./comments");
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const { hasFlowShorthandAnnotationComment } = require("./utils");
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function hasClosureCompilerTypeCastComment(text, path, locStart, locEnd) {
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// https://github.com/google/closure-compiler/wiki/Annotating-Types#type-casts
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// Syntax example: var x = /** @type {string} */ (fruit);
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const n = path.getValue();
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return (
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util.getNextNonSpaceNonCommentCharacter(text, n, locEnd) === ")" &&
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(hasTypeCastComment(n) || hasAncestorTypeCastComment(0))
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);
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// for sub-item: /** @type {array} */ (numberOrString).map(x => x);
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function hasAncestorTypeCastComment(index) {
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const ancestor = path.getParentNode(index);
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return ancestor &&
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util.getNextNonSpaceNonCommentCharacter(text, ancestor, locEnd) !== ")" &&
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/^[\s(]*$/.test(text.slice(locStart(ancestor), locStart(n)))
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? hasTypeCastComment(ancestor) || hasAncestorTypeCastComment(index + 1)
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: false;
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}
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function hasTypeCastComment(node) {
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return (
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node.comments &&
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node.comments.some(
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comment =>
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comment.leading &&
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comments.isBlockComment(comment) &&
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comment.value.match(/^\*\s*@type\s*{[^}]+}\s*$/) &&
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util.getNextNonSpaceNonCommentCharacter(text, comment, locEnd) === "("
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)
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);
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}
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}
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function needsParens(path, options) {
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const parent = path.getParentNode();
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if (!parent) {
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return false;
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}
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const name = path.getName();
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const node = path.getNode();
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// If the value of this path is some child of a Node and not a Node
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// itself, then it doesn't need parentheses. Only Node objects (in
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// fact, only Expression nodes) need parentheses.
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if (path.getValue() !== node) {
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return false;
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}
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// to avoid unexpected `}}` in HTML interpolations
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if (
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options.__isInHtmlInterpolation &&
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!options.bracketSpacing &&
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endsWithRightBracket(node) &&
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isFollowedByRightBracket(path)
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) {
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return true;
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}
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// Only statements don't need parentheses.
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if (isStatement(node)) {
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return false;
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}
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// Closure compiler requires that type casted expressions to be surrounded by
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// parentheses.
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if (
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hasClosureCompilerTypeCastComment(
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options.originalText,
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path,
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options.locStart,
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options.locEnd
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)
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) {
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return true;
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}
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if (
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// Preserve parens if we have a Flow annotation comment, unless we're using the Flow
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// parser. The Flow parser turns Flow comments into type annotation nodes in its
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// AST, which we handle separately.
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options.parser !== "flow" &&
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hasFlowShorthandAnnotationComment(path.getValue())
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) {
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return true;
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}
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// Identifiers never need parentheses.
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if (node.type === "Identifier") {
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return false;
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}
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if (parent.type === "ParenthesizedExpression") {
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return false;
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}
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// Add parens around the extends clause of a class. It is needed for almost
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// all expressions.
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if (
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(parent.type === "ClassDeclaration" || parent.type === "ClassExpression") &&
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parent.superClass === node &&
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(node.type === "ArrowFunctionExpression" ||
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node.type === "AssignmentExpression" ||
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node.type === "AwaitExpression" ||
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node.type === "BinaryExpression" ||
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node.type === "ConditionalExpression" ||
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node.type === "LogicalExpression" ||
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node.type === "NewExpression" ||
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node.type === "ObjectExpression" ||
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node.type === "ParenthesizedExpression" ||
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node.type === "SequenceExpression" ||
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node.type === "TaggedTemplateExpression" ||
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node.type === "UnaryExpression" ||
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node.type === "UpdateExpression" ||
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node.type === "YieldExpression")
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) {
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return true;
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}
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if (parent.type === "Decorator" && parent.expression === node) {
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let hasCallExpression = false;
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let hasMemberExpression = false;
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let current = node;
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while (current) {
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switch (current.type) {
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case "MemberExpression":
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hasMemberExpression = true;
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current = current.object;
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break;
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case "CallExpression":
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if (
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/** @(x().y) */ hasMemberExpression ||
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/** @(x().y()) */ hasCallExpression
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) {
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return true;
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}
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hasCallExpression = true;
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current = current.callee;
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break;
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case "Identifier":
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return false;
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default:
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return true;
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}
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}
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return true;
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}
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if (
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(parent.type === "ArrowFunctionExpression" &&
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parent.body === node &&
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node.type !== "SequenceExpression" && // these have parens added anyway
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util.startsWithNoLookaheadToken(
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node,
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/* forbidFunctionClassAndDoExpr */ false
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)) ||
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(parent.type === "ExpressionStatement" &&
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util.startsWithNoLookaheadToken(
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node,
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/* forbidFunctionClassAndDoExpr */ true
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))
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) {
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return true;
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}
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switch (node.type) {
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case "CallExpression": {
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let firstParentNotMemberExpression = parent;
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let i = 0;
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while (
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firstParentNotMemberExpression &&
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firstParentNotMemberExpression.type === "MemberExpression"
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) {
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firstParentNotMemberExpression = path.getParentNode(++i);
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}
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if (
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firstParentNotMemberExpression.type === "NewExpression" &&
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firstParentNotMemberExpression.callee === path.getParentNode(i - 1)
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) {
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return true;
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}
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if (parent.type === "BindExpression" && parent.callee === node) {
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return true;
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}
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return false;
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}
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case "SpreadElement":
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case "SpreadProperty":
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return (
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parent.type === "MemberExpression" &&
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name === "object" &&
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parent.object === node
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);
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case "UpdateExpression":
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if (parent.type === "UnaryExpression") {
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return (
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node.prefix &&
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((node.operator === "++" && parent.operator === "+") ||
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(node.operator === "--" && parent.operator === "-"))
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);
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}
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// else fallthrough
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case "UnaryExpression":
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switch (parent.type) {
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case "UnaryExpression":
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return (
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node.operator === parent.operator &&
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(node.operator === "+" || node.operator === "-")
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);
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case "BindExpression":
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return true;
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case "MemberExpression":
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return name === "object" && parent.object === node;
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case "TaggedTemplateExpression":
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return true;
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case "NewExpression":
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case "CallExpression":
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return name === "callee" && parent.callee === node;
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case "BinaryExpression":
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return parent.operator === "**" && name === "left";
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case "TSNonNullExpression":
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return true;
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default:
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return false;
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}
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case "BinaryExpression": {
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if (parent.type === "UpdateExpression") {
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return true;
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}
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const isLeftOfAForStatement = node => {
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let i = 0;
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while (node) {
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const parent = path.getParentNode(i++);
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if (!parent) {
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return false;
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}
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if (parent.type === "ForStatement" && parent.init === node) {
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return true;
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}
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node = parent;
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}
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return false;
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};
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if (node.operator === "in" && isLeftOfAForStatement(node)) {
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return true;
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}
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}
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// fallthrough
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case "TSTypeAssertion":
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case "TSAsExpression":
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case "LogicalExpression":
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switch (parent.type) {
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case "ConditionalExpression":
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return node.type === "TSAsExpression";
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case "CallExpression":
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case "NewExpression":
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return name === "callee" && parent.callee === node;
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case "ClassExpression":
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case "ClassDeclaration":
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case "TSAbstractClassDeclaration":
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return name === "superClass" && parent.superClass === node;
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case "TSTypeAssertion":
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case "TaggedTemplateExpression":
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case "UnaryExpression":
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case "SpreadElement":
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case "SpreadProperty":
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case "BindExpression":
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case "AwaitExpression":
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case "TSAsExpression":
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case "TSNonNullExpression":
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case "UpdateExpression":
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return true;
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case "MemberExpression":
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case "OptionalMemberExpression":
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return name === "object" && parent.object === node;
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case "AssignmentExpression":
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return (
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parent.left === node &&
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(node.type === "TSTypeAssertion" || node.type === "TSAsExpression")
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);
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case "BinaryExpression":
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case "LogicalExpression": {
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if (!node.operator && node.type !== "TSTypeAssertion") {
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return true;
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}
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const po = parent.operator;
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const pp = util.getPrecedence(po);
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const no = node.operator;
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const np = util.getPrecedence(no);
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if (pp > np) {
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return true;
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}
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if ((po === "||" || po === "??") && no === "&&") {
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return true;
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}
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if (pp === np && name === "right") {
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assert.strictEqual(parent.right, node);
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return true;
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}
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if (pp === np && !util.shouldFlatten(po, no)) {
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return true;
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}
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if (pp < np && no === "%") {
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return po === "+" || po === "-";
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}
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// Add parenthesis when working with bitwise operators
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// It's not stricly needed but helps with code understanding
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if (util.isBitwiseOperator(po)) {
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return true;
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}
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return false;
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}
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default:
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return false;
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}
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case "TSParenthesizedType": {
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const grandParent = path.getParentNode(1);
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/**
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* const foo = (): (() => void) => (): void => null;
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* ^ ^
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*/
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if (
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getUnparenthesizedNode(node).type === "TSFunctionType" &&
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parent.type === "TSTypeAnnotation" &&
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grandParent.type === "ArrowFunctionExpression" &&
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grandParent.returnType === parent
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) {
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return true;
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}
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if (
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(parent.type === "TSTypeParameter" ||
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parent.type === "TypeParameter" ||
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parent.type === "TSTypeAliasDeclaration" ||
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parent.type === "TSTypeAnnotation" ||
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parent.type === "TSParenthesizedType" ||
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parent.type === "TSTypeParameterInstantiation") &&
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(grandParent.type !== "TSTypeOperator" &&
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grandParent.type !== "TSOptionalType")
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) {
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return false;
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}
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// Delegate to inner TSParenthesizedType
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if (node.typeAnnotation.type === "TSParenthesizedType") {
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return false;
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}
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return true;
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}
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case "SequenceExpression":
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switch (parent.type) {
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case "ReturnStatement":
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return false;
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case "ForStatement":
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// Although parentheses wouldn't hurt around sequence
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// expressions in the head of for loops, traditional style
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// dictates that e.g. i++, j++ should not be wrapped with
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// parentheses.
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return false;
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case "ExpressionStatement":
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return name !== "expression";
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case "ArrowFunctionExpression":
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// We do need parentheses, but SequenceExpressions are handled
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// specially when printing bodies of arrow functions.
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return name !== "body";
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default:
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// Otherwise err on the side of overparenthesization, adding
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// explicit exceptions above if this proves overzealous.
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return true;
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}
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case "YieldExpression":
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if (
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parent.type === "UnaryExpression" ||
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parent.type === "AwaitExpression" ||
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parent.type === "TSAsExpression" ||
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parent.type === "TSNonNullExpression"
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) {
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return true;
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}
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// else fallthrough
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case "AwaitExpression":
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switch (parent.type) {
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case "TaggedTemplateExpression":
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case "UnaryExpression":
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case "BinaryExpression":
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case "LogicalExpression":
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case "SpreadElement":
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case "SpreadProperty":
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case "TSAsExpression":
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case "TSNonNullExpression":
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case "BindExpression":
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return true;
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case "MemberExpression":
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return parent.object === node;
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case "NewExpression":
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case "CallExpression":
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return parent.callee === node;
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case "ConditionalExpression":
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return parent.test === node;
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default:
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return false;
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}
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case "ArrayTypeAnnotation":
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return parent.type === "NullableTypeAnnotation";
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case "IntersectionTypeAnnotation":
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case "UnionTypeAnnotation":
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return (
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parent.type === "ArrayTypeAnnotation" ||
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parent.type === "NullableTypeAnnotation" ||
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parent.type === "IntersectionTypeAnnotation" ||
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parent.type === "UnionTypeAnnotation"
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);
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case "NullableTypeAnnotation":
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return parent.type === "ArrayTypeAnnotation";
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case "FunctionTypeAnnotation": {
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const ancestor =
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parent.type === "NullableTypeAnnotation"
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? path.getParentNode(1)
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: parent;
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return (
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ancestor.type === "UnionTypeAnnotation" ||
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ancestor.type === "IntersectionTypeAnnotation" ||
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ancestor.type === "ArrayTypeAnnotation" ||
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// We should check ancestor's parent to know whether the parentheses
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// are really needed, but since ??T doesn't make sense this check
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// will almost never be true.
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ancestor.type === "NullableTypeAnnotation"
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);
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}
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case "StringLiteral":
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case "NumericLiteral":
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case "Literal":
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if (
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typeof node.value === "string" &&
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parent.type === "ExpressionStatement" &&
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// TypeScript workaround for https://github.com/JamesHenry/typescript-estree/issues/2
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// See corresponding workaround in printer.js case: "Literal"
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((options.parser !== "typescript" && !parent.directive) ||
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(options.parser === "typescript" &&
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options.originalText.substr(options.locStart(node) - 1, 1) === "("))
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) {
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// To avoid becoming a directive
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const grandParent = path.getParentNode(1);
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return (
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grandParent.type === "Program" ||
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grandParent.type === "BlockStatement"
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);
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}
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return (
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parent.type === "MemberExpression" &&
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typeof node.value === "number" &&
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name === "object" &&
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parent.object === node
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);
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case "AssignmentExpression": {
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const grandParent = path.getParentNode(1);
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if (parent.type === "ArrowFunctionExpression" && parent.body === node) {
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return true;
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} else if (
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parent.type === "ClassProperty" &&
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parent.key === node &&
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parent.computed
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) {
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return false;
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} else if (
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parent.type === "TSPropertySignature" &&
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parent.name === node
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) {
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return false;
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} else if (
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parent.type === "ForStatement" &&
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(parent.init === node || parent.update === node)
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) {
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return false;
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} else if (parent.type === "ExpressionStatement") {
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return node.left.type === "ObjectPattern";
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} else if (parent.type === "TSPropertySignature" && parent.key === node) {
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return false;
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} else if (parent.type === "AssignmentExpression") {
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return false;
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} else if (
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parent.type === "SequenceExpression" &&
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grandParent &&
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grandParent.type === "ForStatement" &&
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(grandParent.init === parent || grandParent.update === parent)
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) {
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return false;
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} else if (parent.type === "Property" && parent.value === node) {
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return false;
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} else if (parent.type === "NGChainedExpression") {
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return false;
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}
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return true;
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}
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case "ConditionalExpression":
|
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switch (parent.type) {
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case "TaggedTemplateExpression":
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case "UnaryExpression":
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case "SpreadElement":
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case "SpreadProperty":
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case "BinaryExpression":
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case "LogicalExpression":
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case "NGPipeExpression":
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case "ExportDefaultDeclaration":
|
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case "AwaitExpression":
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case "JSXSpreadAttribute":
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case "TSTypeAssertion":
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case "TypeCastExpression":
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case "TSAsExpression":
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case "TSNonNullExpression":
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case "OptionalMemberExpression":
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return true;
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|
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case "NewExpression":
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case "CallExpression":
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return name === "callee" && parent.callee === node;
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case "ConditionalExpression":
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return name === "test" && parent.test === node;
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|
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case "MemberExpression":
|
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return name === "object" && parent.object === node;
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default:
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return false;
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}
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|
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case "FunctionExpression":
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switch (parent.type) {
|
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case "CallExpression":
|
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return name === "callee"; // Not strictly necessary, but it's clearer to the reader if IIFEs are wrapped in parentheses.
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case "TaggedTemplateExpression":
|
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return true; // This is basically a kind of IIFE.
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case "ExportDefaultDeclaration":
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return true;
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default:
|
|
return false;
|
|
}
|
|
|
|
case "ArrowFunctionExpression":
|
|
switch (parent.type) {
|
|
case "CallExpression":
|
|
return name === "callee";
|
|
|
|
case "NewExpression":
|
|
return name === "callee";
|
|
|
|
case "MemberExpression":
|
|
return name === "object";
|
|
|
|
case "TSAsExpression":
|
|
case "BindExpression":
|
|
case "TaggedTemplateExpression":
|
|
case "UnaryExpression":
|
|
case "LogicalExpression":
|
|
case "BinaryExpression":
|
|
case "AwaitExpression":
|
|
case "TSTypeAssertion":
|
|
return true;
|
|
|
|
case "ConditionalExpression":
|
|
return name === "test";
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
case "ClassExpression":
|
|
return parent.type === "ExportDefaultDeclaration";
|
|
|
|
case "OptionalMemberExpression":
|
|
return parent.type === "MemberExpression";
|
|
|
|
case "MemberExpression":
|
|
if (
|
|
parent.type === "BindExpression" &&
|
|
name === "callee" &&
|
|
parent.callee === node
|
|
) {
|
|
let object = node.object;
|
|
while (object) {
|
|
if (object.type === "CallExpression") {
|
|
return true;
|
|
}
|
|
if (
|
|
object.type !== "MemberExpression" &&
|
|
object.type !== "BindExpression"
|
|
) {
|
|
break;
|
|
}
|
|
object = object.object;
|
|
}
|
|
}
|
|
return false;
|
|
|
|
case "BindExpression":
|
|
if (
|
|
(parent.type === "BindExpression" &&
|
|
name === "callee" &&
|
|
parent.callee === node) ||
|
|
parent.type === "MemberExpression"
|
|
) {
|
|
return true;
|
|
}
|
|
return false;
|
|
case "NGPipeExpression":
|
|
if (
|
|
parent.type === "NGRoot" ||
|
|
parent.type === "ObjectProperty" ||
|
|
parent.type === "ArrayExpression" ||
|
|
((parent.type === "CallExpression" ||
|
|
parent.type === "OptionalCallExpression") &&
|
|
parent.arguments[name] === node) ||
|
|
(parent.type === "NGPipeExpression" && name === "right") ||
|
|
(parent.type === "MemberExpression" && name === "property") ||
|
|
parent.type === "AssignmentExpression"
|
|
) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
function isStatement(node) {
|
|
return (
|
|
node.type === "BlockStatement" ||
|
|
node.type === "BreakStatement" ||
|
|
node.type === "ClassBody" ||
|
|
node.type === "ClassDeclaration" ||
|
|
node.type === "ClassMethod" ||
|
|
node.type === "ClassProperty" ||
|
|
node.type === "ClassPrivateProperty" ||
|
|
node.type === "ContinueStatement" ||
|
|
node.type === "DebuggerStatement" ||
|
|
node.type === "DeclareClass" ||
|
|
node.type === "DeclareExportAllDeclaration" ||
|
|
node.type === "DeclareExportDeclaration" ||
|
|
node.type === "DeclareFunction" ||
|
|
node.type === "DeclareInterface" ||
|
|
node.type === "DeclareModule" ||
|
|
node.type === "DeclareModuleExports" ||
|
|
node.type === "DeclareVariable" ||
|
|
node.type === "DoWhileStatement" ||
|
|
node.type === "ExportAllDeclaration" ||
|
|
node.type === "ExportDefaultDeclaration" ||
|
|
node.type === "ExportNamedDeclaration" ||
|
|
node.type === "ExpressionStatement" ||
|
|
node.type === "ForAwaitStatement" ||
|
|
node.type === "ForInStatement" ||
|
|
node.type === "ForOfStatement" ||
|
|
node.type === "ForStatement" ||
|
|
node.type === "FunctionDeclaration" ||
|
|
node.type === "IfStatement" ||
|
|
node.type === "ImportDeclaration" ||
|
|
node.type === "InterfaceDeclaration" ||
|
|
node.type === "LabeledStatement" ||
|
|
node.type === "MethodDefinition" ||
|
|
node.type === "ReturnStatement" ||
|
|
node.type === "SwitchStatement" ||
|
|
node.type === "ThrowStatement" ||
|
|
node.type === "TryStatement" ||
|
|
node.type === "TSAbstractClassDeclaration" ||
|
|
node.type === "TSDeclareFunction" ||
|
|
node.type === "TSEnumDeclaration" ||
|
|
node.type === "TSImportEqualsDeclaration" ||
|
|
node.type === "TSInterfaceDeclaration" ||
|
|
node.type === "TSModuleDeclaration" ||
|
|
node.type === "TSNamespaceExportDeclaration" ||
|
|
node.type === "TypeAlias" ||
|
|
node.type === "VariableDeclaration" ||
|
|
node.type === "WhileStatement" ||
|
|
node.type === "WithStatement"
|
|
);
|
|
}
|
|
|
|
function getUnparenthesizedNode(node) {
|
|
return node.type === "TSParenthesizedType"
|
|
? getUnparenthesizedNode(node.typeAnnotation)
|
|
: node;
|
|
}
|
|
|
|
function endsWithRightBracket(node) {
|
|
switch (node.type) {
|
|
case "ObjectExpression":
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
function isFollowedByRightBracket(path) {
|
|
const node = path.getValue();
|
|
const parent = path.getParentNode();
|
|
const name = path.getName();
|
|
switch (parent.type) {
|
|
case "NGPipeExpression":
|
|
if (
|
|
typeof name === "number" &&
|
|
parent.arguments[name] === node &&
|
|
parent.arguments.length - 1 === name
|
|
) {
|
|
return path.callParent(isFollowedByRightBracket);
|
|
}
|
|
break;
|
|
case "ObjectProperty":
|
|
if (name === "value") {
|
|
const parentParent = path.getParentNode(1);
|
|
return (
|
|
parentParent.properties[parentParent.properties.length - 1] === parent
|
|
);
|
|
}
|
|
break;
|
|
case "BinaryExpression":
|
|
case "LogicalExpression":
|
|
if (name === "right") {
|
|
return path.callParent(isFollowedByRightBracket);
|
|
}
|
|
break;
|
|
case "ConditionalExpression":
|
|
if (name === "alternate") {
|
|
return path.callParent(isFollowedByRightBracket);
|
|
}
|
|
break;
|
|
case "UnaryExpression":
|
|
if (parent.prefix) {
|
|
return path.callParent(isFollowedByRightBracket);
|
|
}
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
module.exports = needsParens;
|