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* @license
* Copyright Google Inc. 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
*/
import * as ts from 'typescript';
import { Change, InsertChange, NoopChange } from './change';
/**
* Add Import `import { symbolName } from fileName` if the import doesn't exit
* already. Assumes fileToEdit can be resolved and accessed.
* @param fileToEdit (file we want to add import to)
* @param symbolName (item to import)
* @param fileName (path to the file)
* @param isDefault (if true, import follows style for importing default exports)
* @return Change
*/
export function insertImport(
source: ts.SourceFile,
fileToEdit: string,
symbolName: string,
fileName: string,
isDefault = false,
): Change {
const rootNode = source;
const allImports = findNodes(rootNode, ts.SyntaxKind.ImportDeclaration);
// get nodes that map to import statements from the file fileName
const relevantImports = allImports.filter((node) => {
// StringLiteral of the ImportDeclaration is the import file (fileName in this case).
const importFiles = node
.getChildren()
.filter((child) => child.kind === ts.SyntaxKind.StringLiteral)
.map((n) => (n as ts.StringLiteral).text);
return importFiles.filter((file) => file === fileName).length === 1;
});
Iif (relevantImports.length > 0) {
let importsAsterisk = false;
// imports from import file
const imports: ts.Node[] = [];
relevantImports.forEach((n) => {
Array.prototype.push.apply(imports, findNodes(n, ts.SyntaxKind.Identifier));
Iif (findNodes(n, ts.SyntaxKind.AsteriskToken).length > 0) {
importsAsterisk = true;
}
});
// if imports * from fileName, don't add symbolName
Iif (importsAsterisk) {
return new NoopChange();
}
const importTextNodes = imports.filter((n) => (n as ts.Identifier).text === symbolName);
// insert import if it's not there
Iif (importTextNodes.length === 0) {
const fallbackPos =
findNodes(relevantImports[0], ts.SyntaxKind.CloseBraceToken)[0].getStart() ||
findNodes(relevantImports[0], ts.SyntaxKind.FromKeyword)[0].getStart();
return insertAfterLastOccurrence(imports, `, ${symbolName}`, fileToEdit, fallbackPos);
}
return new NoopChange();
}
// no such import declaration exists
const useStrict = findNodes(rootNode, ts.SyntaxKind.StringLiteral).filter(
(n: ts.StringLiteral) => n.text === 'use strict',
);
let fallbackPos = 0;
Iif (useStrict.length > 0) {
fallbackPos = useStrict[0].end;
}
const open = isDefault ? '' : '{ ';
const close = isDefault ? '' : ' }';
// if there are no imports or 'use strict' statement, insert import at beginning of file
const insertAtBeginning = allImports.length === 0 && useStrict.length === 0;
const separator = insertAtBeginning ? '' : ';\n';
const toInsert =
`${separator}import ${open}${symbolName}${close}` + ` from '${fileName}'${insertAtBeginning ? ';\n' : ''}`;
return insertAfterLastOccurrence(allImports, toInsert, fileToEdit, fallbackPos, ts.SyntaxKind.StringLiteral);
}
/**
* Find all nodes from the AST in the subtree of node of SyntaxKind kind.
* @param node
* @param kind
* @param max The maximum number of items to return.
* @return all nodes of kind, or [] if none is found
*/
function findNodes(node: ts.Node, kind: ts.SyntaxKind, max = Infinity): ts.Node[] {
Iif (!node || max == 0) {
return [];
}
const arr: ts.Node[] = [];
if (node.kind === kind) {
arr.push(node);
max--;
}
if (max > 0) {
for (const child of node.getChildren()) {
findNodes(child, kind, max).forEach((node) => {
if (max > 0) {
arr.push(node);
}
max--;
});
Iif (max <= 0) {
break;
}
}
}
return arr;
}
/**
* Get all the nodes from a source.
* @param sourceFile The source file object.
* @returns {Observable<ts.Node>} An observable of all the nodes in the source.
*/
function getSourceNodes(sourceFile: ts.SourceFile): ts.Node[] {
const nodes: ts.Node[] = [sourceFile];
const result: Array<ts.Node> = [];
while (nodes.length > 0) {
const node = nodes.shift();
if (node) {
result.push(node);
if (node.getChildCount(sourceFile) >= 0) {
nodes.unshift(...node.getChildren());
}
}
}
return result;
}
/**
* Helper for sorting nodes.
* @return function to sort nodes in increasing order of position in sourceFile
*/
function nodesByPosition(first: ts.Node, second: ts.Node): number {
return first.getStart() - second.getStart();
}
/**
* Insert `toInsert` after the last occurence of `ts.SyntaxKind[nodes[i].kind]`
* or after the last of occurence of `syntaxKind` if the last occurence is a sub child
* of ts.SyntaxKind[nodes[i].kind] and save the changes in file.
*
* @param nodes insert after the last occurence of nodes
* @param toInsert string to insert
* @param file file to insert changes into
* @param fallbackPos position to insert if toInsert happens to be the first occurence
* @param syntaxKind the ts.SyntaxKind of the subchildren to insert after
* @return Change instance
* @throw Error if toInsert is first occurence but fall back is not set
*/
function insertAfterLastOccurrence(
nodes: ts.Node[],
toInsert: string,
file: string,
fallbackPos: number,
syntaxKind?: ts.SyntaxKind,
): Change {
let lastItem = nodes.sort(nodesByPosition).pop();
Iif (!lastItem) {
throw new Error();
}
if (syntaxKind) {
lastItem = findNodes(lastItem, syntaxKind).sort(nodesByPosition).pop();
}
Iif (!lastItem && fallbackPos == undefined) {
throw new Error(`tried to insert ${toInsert} as first occurence with no fallback position`);
}
const lastItemPosition: number = lastItem ? lastItem.getEnd() : fallbackPos;
return new InsertChange(file, lastItemPosition, toInsert);
}
function _angularImportsFromNode(node: ts.ImportDeclaration, _sourceFile: ts.SourceFile): { [name: string]: string } {
const ms = node.moduleSpecifier;
let modulePath: string;
switch (ms.kind) {
case ts.SyntaxKind.StringLiteral:
modulePath = (ms as ts.StringLiteral).text;
break;
default:
return {};
}
if (!modulePath.startsWith('@angular/')) {
return {};
}
if (node.importClause) {
Iif (node.importClause.name) {
// This is of the form `import Name from 'path'`. Ignore.
return {};
} else if (node.importClause.namedBindings) {
const nb = node.importClause.namedBindings;
Iif (nb.kind == ts.SyntaxKind.NamespaceImport) {
// This is of the form `import * as name from 'path'`. Return `name.`.
return {
[(nb as ts.NamespaceImport).name.text + '.']: modulePath,
};
} else {
// This is of the form `import {a,b,c} from 'path'`
const namedImports = nb as ts.NamedImports;
return namedImports.elements
.map((is: ts.ImportSpecifier) => (is.propertyName ? is.propertyName.text : is.name.text))
.reduce((acc: { [name: string]: string }, curr: string) => {
acc[curr] = modulePath;
return acc;
}, {});
}
}
return {};
} else E{
// This is of the form `import 'path';`. Nothing to do.
return {};
}
}
export function getDecoratorMetadata(source: ts.SourceFile, identifier: string, module: string): ts.Node[] {
const angularImports: { [name: string]: string } = findNodes(source, ts.SyntaxKind.ImportDeclaration)
.map((node: ts.ImportDeclaration) => _angularImportsFromNode(node, source))
.reduce((acc: { [name: string]: string }, current: { [name: string]: string }) => {
for (const key of Object.keys(current)) {
acc[key] = current[key];
}
return acc;
}, {});
return getSourceNodes(source)
.filter((node) => {
return (
node.kind == ts.SyntaxKind.Decorator && (node as ts.Decorator).expression.kind == ts.SyntaxKind.CallExpression
);
})
.map((node) => (node as ts.Decorator).expression as ts.CallExpression)
.filter((expr) => {
if (expr.expression.kind == ts.SyntaxKind.Identifier) {
const id = expr.expression as ts.Identifier;
return id.getFullText(source) == identifier && angularImports[id.getFullText(source)] === module;
} else IEif (expr.expression.kind == ts.SyntaxKind.PropertyAccessExpression) {
// This covers foo.NgModule when importing * as foo.
const paExpr = expr.expression as ts.PropertyAccessExpression;
// If the left expression is not an identifier, just give up at that point.
Iif (paExpr.expression.kind !== ts.SyntaxKind.Identifier) {
return false;
}
const id = paExpr.name.text;
const moduleId = (paExpr.expression as ts.Identifier).getText(source);
return id === identifier && angularImports[moduleId + '.'] === module;
}
return false;
})
.filter((expr) => expr.arguments[0] && expr.arguments[0].kind == ts.SyntaxKind.ObjectLiteralExpression)
.map((expr) => expr.arguments[0] as ts.ObjectLiteralExpression);
}
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