/
util.ts
702 lines (629 loc) Β· 26.9 KB
/
util.ts
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/**
* @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
*/
import {Attribute, Element, HtmlParser, Node, ParseTreeResult, visitAll} from '@angular/compiler';
import {dirname, join} from 'path';
import ts from 'typescript';
import {AnalyzedFile, CommonCollector, ElementCollector, ElementToMigrate, endI18nMarker, endMarker, i18nCollector, ParseResult, startI18nMarker, startMarker, Template, TemplateCollector} from './types';
const importRemovals = [
'NgIf', 'NgIfElse', 'NgIfThenElse', 'NgFor', 'NgForOf', 'NgForTrackBy', 'NgSwitch',
'NgSwitchCase', 'NgSwitchDefault'
];
const importWithCommonRemovals = [...importRemovals, 'CommonModule'];
const startMarkerRegex = new RegExp(startMarker, 'gm');
const endMarkerRegex = new RegExp(endMarker, 'gm');
const startI18nMarkerRegex = new RegExp(startI18nMarker, 'gm');
const endI18nMarkerRegex = new RegExp(endI18nMarker, 'gm');
const replaceMarkerRegex = new RegExp(`${startMarker}|${endMarker}`, 'gm');
/**
* Analyzes a source file to find file that need to be migrated and the text ranges within them.
* @param sourceFile File to be analyzed.
* @param analyzedFiles Map in which to store the results.
*/
export function analyze(sourceFile: ts.SourceFile, analyzedFiles: Map<string, AnalyzedFile>) {
forEachClass(sourceFile, node => {
if (ts.isClassDeclaration(node)) {
analyzeDecorators(node, sourceFile, analyzedFiles);
} else {
analyzeImportDeclarations(node, sourceFile, analyzedFiles);
}
});
}
function checkIfShouldChange(decl: ts.ImportDeclaration, removeCommonModule: boolean) {
// should change if you can remove the common module
// if it's not safe to remove the common module
// and that's the only thing there, we should do nothing.
const clause = decl.getChildAt(1) as ts.ImportClause;
return !(
!removeCommonModule && clause.namedBindings && ts.isNamedImports(clause.namedBindings) &&
clause.namedBindings.elements.length === 1 &&
clause.namedBindings.elements[0].getText() === 'CommonModule');
}
function updateImportDeclaration(decl: ts.ImportDeclaration, removeCommonModule: boolean): string {
const clause = decl.getChildAt(1) as ts.ImportClause;
const updatedClause = updateImportClause(clause, removeCommonModule);
if (updatedClause === null) {
return '';
}
// removeComments is set to true to prevent duplication of comments
// when the import declaration is at the top of the file, but right after a comment
// without this, the comment gets duplicated when the declaration is updated.
// the typescript AST includes that preceding comment as part of the import declaration full text.
const printer = ts.createPrinter({
removeComments: true,
});
const updated = ts.factory.updateImportDeclaration(
decl, decl.modifiers, updatedClause, decl.moduleSpecifier, undefined);
return printer.printNode(ts.EmitHint.Unspecified, updated, clause.getSourceFile());
}
function updateImportClause(clause: ts.ImportClause, removeCommonModule: boolean): ts.ImportClause|
null {
if (clause.namedBindings && ts.isNamedImports(clause.namedBindings)) {
const removals = removeCommonModule ? importWithCommonRemovals : importRemovals;
const elements = clause.namedBindings.elements.filter(el => !removals.includes(el.getText()));
if (elements.length === 0) {
return null;
}
clause = ts.factory.updateImportClause(
clause, clause.isTypeOnly, clause.name, ts.factory.createNamedImports(elements));
}
return clause;
}
function updateClassImports(
propAssignment: ts.PropertyAssignment, removeCommonModule: boolean): string|null {
const printer = ts.createPrinter();
const importList = propAssignment.initializer as ts.ArrayLiteralExpression;
const removals = removeCommonModule ? importWithCommonRemovals : importRemovals;
const elements = importList.elements.filter(el => !removals.includes(el.getText()));
if (elements.length === importList.elements.length) {
// nothing changed
return null;
}
const updatedElements = ts.factory.updateArrayLiteralExpression(importList, elements);
const updatedAssignment =
ts.factory.updatePropertyAssignment(propAssignment, propAssignment.name, updatedElements);
return printer.printNode(
ts.EmitHint.Unspecified, updatedAssignment, updatedAssignment.getSourceFile());
}
function analyzeImportDeclarations(
node: ts.ImportDeclaration, sourceFile: ts.SourceFile,
analyzedFiles: Map<string, AnalyzedFile>) {
if (node.getText().indexOf('@angular/common') === -1) {
return;
}
const clause = node.getChildAt(1) as ts.ImportClause;
if (clause.namedBindings && ts.isNamedImports(clause.namedBindings)) {
const elements =
clause.namedBindings.elements.filter(el => importWithCommonRemovals.includes(el.getText()));
if (elements.length > 0) {
AnalyzedFile.addRange(
sourceFile.fileName, sourceFile.fileName, analyzedFiles,
{start: node.getStart(), end: node.getEnd(), node, type: 'import'});
}
}
}
function analyzeDecorators(
node: ts.ClassDeclaration, sourceFile: ts.SourceFile,
analyzedFiles: Map<string, AnalyzedFile>) {
// Note: we have a utility to resolve the Angular decorators from a class declaration already.
// We don't use it here, because it requires access to the type checker which makes it more
// time-consuming to run internally.
const decorator = ts.getDecorators(node)?.find(dec => {
return ts.isCallExpression(dec.expression) && ts.isIdentifier(dec.expression.expression) &&
dec.expression.expression.text === 'Component';
}) as (ts.Decorator & {expression: ts.CallExpression}) |
undefined;
const metadata = decorator && decorator.expression.arguments.length > 0 &&
ts.isObjectLiteralExpression(decorator.expression.arguments[0]) ?
decorator.expression.arguments[0] :
null;
if (!metadata) {
return;
}
for (const prop of metadata.properties) {
// All the properties we care about should have static
// names and be initialized to a static string.
if (!ts.isPropertyAssignment(prop) ||
(!ts.isIdentifier(prop.name) && !ts.isStringLiteralLike(prop.name))) {
continue;
}
switch (prop.name.text) {
case 'template':
// +1/-1 to exclude the opening/closing characters from the range.
AnalyzedFile.addRange(sourceFile.fileName, sourceFile.fileName, analyzedFiles, {
start: prop.initializer.getStart() + 1,
end: prop.initializer.getEnd() - 1,
node: prop,
type: 'template'
});
break;
case 'imports':
AnalyzedFile.addRange(sourceFile.fileName, sourceFile.fileName, analyzedFiles, {
start: prop.name.getStart(),
end: prop.initializer.getEnd(),
node: prop,
type: 'import'
});
break;
case 'templateUrl':
// Leave the end as undefined which means that the range is until the end of the file.
if (ts.isStringLiteralLike(prop.initializer)) {
const path = join(dirname(sourceFile.fileName), prop.initializer.text);
AnalyzedFile.addRange(
path, sourceFile.fileName, analyzedFiles,
{start: 0, node: prop, type: 'templateUrl'});
}
break;
}
}
}
/**
* returns the level deep a migratable element is nested
*/
function getNestedCount(etm: ElementToMigrate, aggregator: number[]) {
if (aggregator.length === 0) {
return 0;
}
if (etm.el.sourceSpan.start.offset < aggregator[aggregator.length - 1] &&
etm.el.sourceSpan.end.offset !== aggregator[aggregator.length - 1]) {
// element is nested
aggregator.push(etm.el.sourceSpan.end.offset);
return aggregator.length - 1;
} else {
// not nested
aggregator.pop()!;
return getNestedCount(etm, aggregator);
}
}
/**
* parses the template string into the Html AST
*/
export function parseTemplate(template: string): ParseResult {
let parsed: ParseTreeResult;
try {
// Note: we use the HtmlParser here, instead of the `parseTemplate` function, because the
// latter returns an Ivy AST, not an HTML AST. The HTML AST has the advantage of preserving
// interpolated text as text nodes containing a mixture of interpolation tokens and text tokens,
// rather than turning them into `BoundText` nodes like the Ivy AST does. This allows us to
// easily get the text-only ranges without having to reconstruct the original text.
parsed = new HtmlParser().parse(template, '', {
// Allows for ICUs to be parsed.
tokenizeExpansionForms: true,
// Explicitly disable blocks so that their characters are treated as plain text.
tokenizeBlocks: true,
preserveLineEndings: true,
});
// Don't migrate invalid templates.
if (parsed.errors && parsed.errors.length > 0) {
const errors = parsed.errors.map(e => ({type: 'parse', error: e}));
return {tree: undefined, errors};
}
} catch (e: any) {
return {tree: undefined, errors: [{type: 'parse', error: e}]};
}
return {tree: parsed, errors: []};
}
/**
* calculates the level of nesting of the items in the collector
*/
export function calculateNesting(
visitor: ElementCollector|TemplateCollector, hasLineBreaks: boolean): void {
// start from top of template
// loop through each element
let nestedQueue: number[] = [];
for (let i = 0; i < visitor.elements.length; i++) {
let currEl = visitor.elements[i];
if (i === 0) {
nestedQueue.push(currEl.el.sourceSpan.end.offset);
currEl.hasLineBreaks = hasLineBreaks;
continue;
}
currEl.hasLineBreaks = hasLineBreaks;
currEl.nestCount = getNestedCount(currEl, nestedQueue);
if (currEl.el.sourceSpan.end.offset !== nestedQueue[nestedQueue.length - 1]) {
nestedQueue.push(currEl.el.sourceSpan.end.offset);
}
}
}
function escapeRegExp(val: string) {
return val.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}
/**
* determines if a given template string contains line breaks
*/
export function hasLineBreaks(template: string): boolean {
return /\r|\n/.test(template);
}
/**
* properly adjusts template offsets based on current nesting levels
*/
export function reduceNestingOffset(
el: ElementToMigrate, nestLevel: number, offset: number, postOffsets: number[]): number {
if (el.nestCount <= nestLevel) {
const count = nestLevel - el.nestCount;
// reduced nesting, add postoffset
for (let i = 0; i <= count; i++) {
offset += postOffsets.pop() ?? 0;
}
}
return offset;
}
/**
* Replaces structural directive control flow instances with block control flow equivalents.
* Returns null if the migration failed (e.g. there was a syntax error).
*/
export function getTemplates(template: string): Map<string, Template> {
const parsed = parseTemplate(template);
if (parsed.tree !== undefined) {
const visitor = new TemplateCollector();
visitAll(visitor, parsed.tree.rootNodes);
// count usages of each ng-template
for (let [key, tmpl] of visitor.templates) {
const escapeKey = escapeRegExp(key.slice(1));
const regex = new RegExp(`[^a-zA-Z0-9-<(\']${escapeKey}\\W`, 'gm');
const matches = template.match(regex);
tmpl.count = matches?.length ?? 0;
tmpl.generateContents(template);
}
return visitor.templates;
}
return new Map<string, Template>();
}
export function updateTemplates(
template: string, templates: Map<string, Template>): Map<string, Template> {
const updatedTemplates = getTemplates(template);
for (let [key, tmpl] of updatedTemplates) {
templates.set(key, tmpl);
}
return templates;
}
function wrapIntoI18nContainer(i18nAttr: Attribute, content: string) {
const {start, middle, end} = generatei18nContainer(i18nAttr, content);
return `${start}${middle}${end}`;
}
function generatei18nContainer(
i18nAttr: Attribute, middle: string): {start: string, middle: string, end: string} {
const i18n = i18nAttr.value === '' ? 'i18n' : `i18n="${i18nAttr.value}"`;
return {start: `<ng-container ${i18n}>`, middle, end: `</ng-container>`};
}
/**
* Counts, replaces, and removes any necessary ng-templates post control flow migration
*/
export function processNgTemplates(template: string): {migrated: string, err: Error|undefined} {
// count usage
try {
const templates = getTemplates(template);
// swap placeholders and remove
for (const [name, t] of templates) {
const replaceRegex = new RegExp(`ΞΈ${name.slice(1)}\\Ξ΄`, 'g');
const forRegex = new RegExp(`ΞΈ${name.slice(1)}\\Ο`, 'g');
const forMatches = [...template.matchAll(forRegex)];
const matches = [...forMatches, ...template.matchAll(replaceRegex)];
let safeToRemove = true;
if (matches.length > 0) {
if (t.i18n !== null) {
const container = wrapIntoI18nContainer(t.i18n, t.children);
template = template.replace(replaceRegex, container);
} else if (t.children.trim() === '' && t.isNgTemplateOutlet) {
template = template.replace(replaceRegex, t.generateTemplateOutlet());
} else if (forMatches.length > 0) {
if (t.count === 2) {
template = template.replace(forRegex, t.children);
} else {
template = template.replace(forRegex, t.generateTemplateOutlet());
safeToRemove = false;
}
} else {
template = template.replace(replaceRegex, t.children);
}
// the +1 accounts for the t.count's counting of the original template
if (t.count === matches.length + 1 && safeToRemove) {
template = template.replace(t.contents, `${startMarker}${endMarker}`);
}
// templates may have changed structure from nested replaced templates
// so we need to reprocess them before the next loop.
updateTemplates(template, templates);
}
}
// template placeholders may still exist if the ng-template name is not
// present in the component. This could be because it's passed in from
// another component. In that case, we need to replace any remaining
// template placeholders with template outlets.
template = replaceRemainingPlaceholders(template);
return {migrated: template, err: undefined};
} catch (err) {
return {migrated: template, err: err as Error};
}
}
function replaceRemainingPlaceholders(template: string): string {
const replaceRegex = new RegExp(`ΞΈ.*Ξ΄`, 'g');
const placeholders = [...template.matchAll(replaceRegex)];
for (let ph of placeholders) {
const placeholder = ph[0];
const name = placeholder.slice(1, placeholder.length - 1);
template =
template.replace(placeholder, `<ng-template [ngTemplateOutlet]="${name}"></ng-template>`);
}
return template;
}
/**
* determines if the CommonModule can be safely removed from imports
*/
export function canRemoveCommonModule(template: string): boolean {
const parsed = parseTemplate(template);
let removeCommonModule = false;
if (parsed.tree !== undefined) {
const visitor = new CommonCollector();
visitAll(visitor, parsed.tree.rootNodes);
removeCommonModule = visitor.count === 0;
}
return removeCommonModule;
}
/**
* removes imports from template imports and import declarations
*/
export function removeImports(
template: string, node: ts.Node, removeCommonModule: boolean): string {
if (template.startsWith('imports') && ts.isPropertyAssignment(node)) {
const updatedImport = updateClassImports(node, removeCommonModule);
return updatedImport ?? template;
} else if (ts.isImportDeclaration(node) && checkIfShouldChange(node, removeCommonModule)) {
return updateImportDeclaration(node, removeCommonModule);
}
return template;
}
/**
* retrieves the original block of text in the template for length comparison during migration
* processing
*/
export function getOriginals(etm: ElementToMigrate, tmpl: string, offset: number):
{start: string, end: string, childLength: number, children: string[], childNodes: Node[]} {
// original opening block
if (etm.el.children.length > 0) {
const childStart = etm.el.children[0].sourceSpan.start.offset - offset;
const childEnd = etm.el.children[etm.el.children.length - 1].sourceSpan.end.offset - offset;
const start = tmpl.slice(
etm.el.sourceSpan.start.offset - offset,
etm.el.children[0].sourceSpan.start.offset - offset);
// original closing block
const end = tmpl.slice(
etm.el.children[etm.el.children.length - 1].sourceSpan.end.offset - offset,
etm.el.sourceSpan.end.offset - offset);
const childLength = childEnd - childStart;
return {
start,
end,
childLength,
children: getOriginalChildren(etm.el.children, tmpl, offset),
childNodes: etm.el.children
};
}
// self closing or no children
const start =
tmpl.slice(etm.el.sourceSpan.start.offset - offset, etm.el.sourceSpan.end.offset - offset);
// original closing block
return {start, end: '', childLength: 0, children: [], childNodes: []};
}
function getOriginalChildren(children: Node[], tmpl: string, offset: number) {
return children.map(child => {
return tmpl.slice(child.sourceSpan.start.offset - offset, child.sourceSpan.end.offset - offset);
});
}
function isI18nTemplate(etm: ElementToMigrate, i18nAttr: Attribute|undefined): boolean {
let attrCount = countAttributes(etm);
const safeToRemove = etm.el.attrs.length === attrCount + (i18nAttr !== undefined ? 1 : 0);
return etm.el.name === 'ng-template' && i18nAttr !== undefined && safeToRemove;
}
function isRemovableContainer(etm: ElementToMigrate): boolean {
let attrCount = countAttributes(etm);
const safeToRemove = etm.el.attrs.length === attrCount;
return (etm.el.name === 'ng-container' || etm.el.name === 'ng-template') && safeToRemove;
}
function countAttributes(etm: ElementToMigrate): number {
let attrCount = 1;
if (etm.elseAttr !== undefined) {
attrCount++;
}
if (etm.thenAttr !== undefined) {
attrCount++;
}
attrCount += etm.aliasAttrs?.aliases.size ?? 0;
attrCount += etm.aliasAttrs?.item ? 1 : 0;
attrCount += etm.forAttrs?.trackBy ? 1 : 0;
attrCount += etm.forAttrs?.forOf ? 1 : 0;
return attrCount;
}
/**
* builds the proper contents of what goes inside a given control flow block after migration
*/
export function getMainBlock(etm: ElementToMigrate, tmpl: string, offset: number):
{start: string, middle: string, end: string} {
const i18nAttr = etm.el.attrs.find(x => x.name === 'i18n');
// removable containers are ng-templates or ng-containers that no longer need to exist
// post migration
if (isRemovableContainer(etm)) {
let middle = '';
if (etm.hasChildren()) {
const {childStart, childEnd} = etm.getChildSpan(offset);
middle = tmpl.slice(childStart, childEnd);
} else {
middle = startMarker + endMarker;
}
return {start: '', middle, end: ''};
} else if (isI18nTemplate(etm, i18nAttr)) {
// here we're removing an ng-template used for control flow and i18n and
// converting it to an ng-container with i18n
const {childStart, childEnd} = etm.getChildSpan(offset);
return generatei18nContainer(i18nAttr!, tmpl.slice(childStart, childEnd));
}
// the index of the start of the attribute adjusting for offset shift
const attrStart = etm.attr.keySpan!.start.offset - 1 - offset;
// the index of the very end of the attribute value adjusted for offset shift
const valEnd = etm.getValueEnd(offset);
// the index of the children start and end span, if they exist. Otherwise use the value end.
const {childStart, childEnd} =
etm.hasChildren() ? etm.getChildSpan(offset) : {childStart: valEnd, childEnd: valEnd};
// the beginning of the updated string in the main block, for example: <div some="attributes">
let start = tmpl.slice(etm.start(offset), attrStart) + tmpl.slice(valEnd, childStart);
// the middle is the actual contents of the element
const middle = tmpl.slice(childStart, childEnd);
// the end is the closing part of the element, example: </div>
let end = tmpl.slice(childEnd, etm.end(offset));
if (etm.shouldRemoveElseAttr()) {
// this removes a bound ngIfElse attribute that's no longer needed
// this could be on the start or end
start = start.replace(etm.getElseAttrStr(), '');
end = end.replace(etm.getElseAttrStr(), '');
}
return {start, middle, end};
}
function generateI18nMarkers(tmpl: string): string {
let parsed = parseTemplate(tmpl);
if (parsed.tree !== undefined) {
const visitor = new i18nCollector();
visitAll(visitor, parsed.tree.rootNodes);
for (const [ix, el] of visitor.elements.entries()) {
// we only care about elements with children and i18n tags
// elements without children have nothing to translate
// offset accounts for the addition of the 2 marker characters with each loop.
const offset = ix * 2;
if (el.children.length > 0) {
tmpl = addI18nMarkers(tmpl, el, offset);
}
}
}
return tmpl;
}
function addI18nMarkers(tmpl: string, el: Element, offset: number): string {
const startPos = el.children[0].sourceSpan.start.offset + offset;
const endPos = el.children[el.children.length - 1].sourceSpan.end.offset + offset;
return tmpl.slice(0, startPos) + startI18nMarker + tmpl.slice(startPos, endPos) + endI18nMarker +
tmpl.slice(endPos);
}
const selfClosingList = 'input|br|img|base|wbr|area|col|embed|hr|link|meta|param|source|track';
/**
* re-indents all the lines in the template properly post migration
*/
export function formatTemplate(tmpl: string, templateType: string): string {
if (tmpl.indexOf('\n') > -1) {
tmpl = generateI18nMarkers(tmpl);
// tracks if a self closing element opened without closing yet
let openSelfClosingEl = false;
// match any type of control flow block as start of string ignoring whitespace
// @if | @switch | @case | @default | @for | } @else
const openBlockRegex = /^\s*\@(if|switch|case|default|for)|^\s*\}\s\@else/;
// regex for matching an html element opening
// <div thing="stuff" [binding]="true"> || <div thing="stuff" [binding]="true"
const openElRegex = /^\s*<([a-z0-9]+)(?![^>]*\/>)[^>]*>?/;
// regex for matching a self closing html element that has no />
// <input type="button" [binding]="true">
const selfClosingRegex = new RegExp(`^\\s*<(${selfClosingList}).+\\/?>`);
// regex for matching a self closing html element that is on multi lines
// <input type="button" [binding]="true"> || <input type="button" [binding]="true"
const openSelfClosingRegex = new RegExp(`^\\s*<(${selfClosingList})(?![^>]*\\/>)[^>]*$`);
// match closing block or else block
// } | } @else
const closeBlockRegex = /^\s*\}\s*$|^\s*\}\s\@else/;
// matches closing of an html element
// </element>
const closeElRegex = /\s*<\/([a-zA-Z0-9\-]+)*>/;
// matches closing of a self closing html element when the element is on multiple lines
// [binding]="value" />
const closeMultiLineElRegex = /^\s*([a-zA-Z0-9\-\[\]]+)?=?"?([^β<]+)?"?\s?\/>$/;
// matches closing of a self closing html element when the element is on multiple lines
// with no / in the closing: [binding]="value">
const closeSelfClosingMultiLineRegex = /^\s*([a-zA-Z0-9\-\[\]]+)?=?"?([^β\/<]+)?"?\s?>$/;
// matches an open and close of an html element on a single line with no breaks
// <div>blah</div>
const singleLineElRegex = /\s*<([a-zA-Z0-9]+)(?![^>]*\/>)[^>]*>.*<\/([a-zA-Z0-9\-]+)*>/;
const lines = tmpl.split('\n');
const formatted = [];
// the indent applied during formatting
let indent = '';
// the pre-existing indent in an inline template that we'd like to preserve
let mindent = '';
let depth = 0;
let i18nDepth = 0;
let inMigratedBlock = false;
let inI18nBlock = false;
for (let [index, line] of lines.entries()) {
depth +=
[...line.matchAll(startMarkerRegex)].length - [...line.matchAll(endMarkerRegex)].length;
inMigratedBlock = depth > 0;
i18nDepth += [...line.matchAll(startI18nMarkerRegex)].length -
[...line.matchAll(endI18nMarkerRegex)].length;
let lineWasMigrated = false;
if (line.match(replaceMarkerRegex)) {
line = line.replace(replaceMarkerRegex, '');
lineWasMigrated = true;
}
if ((line.trim() === '' && index !== 0 && index !== lines.length - 1) &&
(inMigratedBlock || lineWasMigrated) && !inI18nBlock) {
// skip blank lines except if it's the first line or last line
// this preserves leading and trailing spaces if they are already present
continue;
}
// preserves the indentation of an inline template
if (templateType === 'template' && index <= 1) {
// first real line of an inline template
const ind = line.search(/\S/);
mindent = (ind > -1) ? line.slice(0, ind) : '';
}
// if a block closes, an element closes, and it's not an element on a single line or the end
// of a self closing tag
if ((closeBlockRegex.test(line) ||
(closeElRegex.test(line) &&
(!singleLineElRegex.test(line) && !closeMultiLineElRegex.test(line)))) &&
indent !== '') {
// close block, reduce indent
indent = indent.slice(2);
}
const newLine =
inI18nBlock ? line : mindent + (line.trim() !== '' ? indent : '') + line.trim();
formatted.push(newLine);
// this matches any self closing element that actually has a />
if (closeMultiLineElRegex.test(line)) {
// multi line self closing tag
indent = indent.slice(2);
if (openSelfClosingEl) {
openSelfClosingEl = false;
}
}
// this matches a self closing element that doesn't have a / in the >
if (closeSelfClosingMultiLineRegex.test(line) && openSelfClosingEl) {
openSelfClosingEl = false;
indent = indent.slice(2);
}
// this matches an open control flow block, an open HTML element, but excludes single line
// self closing tags
if ((openBlockRegex.test(line) || openElRegex.test(line)) && !singleLineElRegex.test(line) &&
!selfClosingRegex.test(line) && !openSelfClosingRegex.test(line)) {
// open block, increase indent
indent += ' ';
}
// This is a self closing element that is definitely not fully closed and is on multiple lines
if (openSelfClosingRegex.test(line)) {
openSelfClosingEl = true;
// add to the indent for the properties on it to look nice
indent += ' ';
}
inI18nBlock = i18nDepth > 0;
}
tmpl = formatted.join('\n');
}
return tmpl;
}
/** Executes a callback on each class declaration in a file. */
function forEachClass(
sourceFile: ts.SourceFile, callback: (node: ts.ClassDeclaration|ts.ImportDeclaration) => void) {
sourceFile.forEachChild(function walk(node) {
if (ts.isClassDeclaration(node) || ts.isImportDeclaration(node)) {
callback(node);
}
node.forEachChild(walk);
});
}