@angular/material
Version:
Angular Material
66 lines • 7.61 kB
JavaScript
;
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.removeElementFromArrayExpression = exports.getParentSyntaxList = void 0;
const ts = require("typescript");
/**
* Retrieves the parent syntax list of the given node. A syntax list node is usually
* hidden from the default AST node hierarchy because it only contains information that
* is need when printing a node. e.g. it contains information about comma positions in
* an array literal expression.
*/
function getParentSyntaxList(node) {
if (!node.parent) {
return null;
}
const parent = node.parent;
const { pos, end } = node;
for (const child of parent.getChildren()) {
if (child.pos > end || child === node) {
return null;
}
if (child.kind === ts.SyntaxKind.SyntaxList && child.pos <= pos && child.end >= end) {
return child;
}
}
return null;
}
exports.getParentSyntaxList = getParentSyntaxList;
/** Looks for the trailing comma of the given element within the syntax list. */
function findTrailingCommaToken(list, element) {
let foundElement = false;
for (let child of list.getChildren()) {
if (!foundElement && child === element) {
foundElement = true;
}
else if (foundElement) {
if (child.kind === ts.SyntaxKind.CommaToken) {
return child;
}
break;
}
}
return null;
}
/** Removes a given element from its parent array literal expression. */
function removeElementFromArrayExpression(element, recorder) {
recorder.remove(element.getFullStart(), element.getFullWidth());
const syntaxList = getParentSyntaxList(element);
if (!syntaxList) {
return;
}
// if there is a trailing comma token for the element, we need to remove it
// because otherwise the array literal expression will have syntax failures.
const trailingComma = findTrailingCommaToken(syntaxList, element);
if (trailingComma !== null) {
recorder.remove(trailingComma.getFullStart(), trailingComma.getFullWidth());
}
}
exports.removeElementFromArrayExpression = removeElementFromArrayExpression;
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50YXhMaXN0LCBlbGVtZW50KTtcbiAgaWYgKHRyYWlsaW5nQ29tbWEgIT09IG51bGwpIHtcbiAgICByZWNvcmRlci5yZW1vdmUodHJhaWxpbmdDb21tYS5nZXRGdWxsU3RhcnQoKSwgdHJhaWxpbmdDb21tYS5nZXRGdWxsV2lkdGgoKSk7XG4gIH1cbn1cbiJdfQ==