feat(rule): add option in max-inline-declarations to limit animations…

… lines (#569)

src/angular/metadata.ts

@@ -1,5 +1,5 @@
-import * as ts from 'typescript';
 import { RawSourceMap } from 'source-map';
+import * as ts from 'typescript';
 
 export interface CodeWithSourceMap {
   code: string;
@@ -12,6 +12,10 @@ interface PropertyMetadata {
   url?: string;
 }
 
+export interface AnimationMetadata extends PropertyMetadata {
+  animation: CodeWithSourceMap;
+}
+
 export interface StyleMetadata extends PropertyMetadata {
   style: CodeWithSourceMap;
 }
@@ -27,6 +31,7 @@ export class DirectiveMetadata {
 }
 
 export class ComponentMetadata extends DirectiveMetadata {
+  animations!: AnimationMetadata[];
   styles!: StyleMetadata[];
   template!: TemplateMetadata;
 }

src/angular/metadataReader.ts

@@ -9,11 +9,11 @@ import {
 } from '../util/astQuery';
 import { ifTrue, listToMaybe, Maybe, unwrapFirst } from '../util/function';
 import { logger } from '../util/logger';
-import { getInlineStyle, getTemplate } from '../util/ngQuery';
+import { getAnimations, getInlineStyle, getTemplate } from '../util/ngQuery';
 import { maybeNodeArray } from '../util/utils';
 import { Config } from './config';
 import { FileResolver } from './fileResolver/fileResolver';
-import { CodeWithSourceMap, ComponentMetadata, DirectiveMetadata, StyleMetadata, TemplateMetadata } from './metadata';
+import { AnimationMetadata, CodeWithSourceMap, ComponentMetadata, DirectiveMetadata, StyleMetadata, TemplateMetadata } from './metadata';
 import { AbstractResolver, MetadataUrls } from './urlResolvers/abstractResolver';
 import { PathResolver } from './urlResolvers/pathResolver';
 import { UrlResolver } from './urlResolvers/urlResolver';
@@ -71,10 +71,12 @@ export class MetadataReader {
     const expr = this.getDecoratorArgument(dec);
     const directiveMetadata = this.readDirectiveMetadata(d, dec);
     const external_M = expr.fmap(() => this._urlResolver!.resolve(dec));
+    const animations_M = external_M.bind(external => this.readComponentAnimationsMetadata(dec, external!));
     const style_M = external_M.bind(external => this.readComponentStylesMetadata(dec, external!));
     const template_M = external_M.bind(external => this.readComponentTemplateMetadata(dec, external!));
 
     return Object.assign(new ComponentMetadata(), directiveMetadata, {
+      animations: animations_M.unwrap(),
       styles: style_M.unwrap(),
       template: template_M.unwrap()
     });
@@ -84,6 +86,17 @@ export class MetadataReader {
     return decoratorArgument(decorator).bind(ifTrue(hasProperties));
   }
 
+  protected readComponentAnimationsMetadata(dec: ts.Decorator, external: MetadataUrls): Maybe<AnimationMetadata[] | undefined> {
+    return getAnimations(dec).fmap(inlineAnimations =>
+      inlineAnimations!.elements
+        .filter(inlineAnimation => isSimpleTemplateString(inlineAnimation))
+        .map<AnimationMetadata>(inlineAnimation => ({
+          animation: normalizeTransformed({ code: (inlineAnimation as ts.StringLiteral | ts.NoSubstitutionTemplateLiteral).text }),
+          node: inlineAnimation as ts.Node
+        }))
+    );
+  }
+
   protected readComponentTemplateMetadata(dec: ts.Decorator, external: MetadataUrls): Maybe<TemplateMetadata | undefined> {
     // Resolve Inline template
     return getTemplate(dec)

src/maxInlineDeclarationsRule.ts

@@ -4,19 +4,24 @@ import { SourceFile } from 'typescript/lib/typescript';
 import { CodeWithSourceMap, ComponentMetadata } from './angular/metadata';
 import { NgWalker } from './angular/ngWalker';
 
+const DEFAULT_ANIMATIONS_LIMIT: number = 15;
 const DEFAULT_STYLES_LIMIT: number = 3;
 const DEFAULT_TEMPLATE_LIMIT: number = 3;
+const OPTION_ANIMATIONS = 'animations';
 const OPTION_STYLES = 'styles';
 const OPTION_TEMPLATE = 'template';
 
 export class Rule extends Rules.AbstractRule {
   static readonly metadata: IRuleMetadata = {
     description: 'Disallows having too many lines in inline template and styles. Forces separate template or styles file creation.',
     descriptionDetails: 'See more at https://angular.io/guide/styleguide#style-05-04.',
-    optionExamples: [true, [true, { [OPTION_STYLES]: 8, [OPTION_TEMPLATE]: 5 }]],
+    optionExamples: [true, [true, { [OPTION_ANIMATIONS]: 20, [OPTION_STYLES]: 8, [OPTION_TEMPLATE]: 5 }]],
     options: {
       items: {
         properties: {
+          [OPTION_ANIMATIONS]: {
+            type: 'number'
+          },
           [OPTION_STYLES]: {
             type: 'number'
           },
@@ -31,7 +36,8 @@ export class Rule extends Rules.AbstractRule {
       type: 'array'
     },
     optionsDescription: Utils.dedent`
-      It can take an optional object with the properties '${OPTION_STYLES}' and '${OPTION_TEMPLATE}':
+      It can take an optional object with the properties '${OPTION_ANIMATIONS}', '${OPTION_STYLES}' and '${OPTION_TEMPLATE}':
+      * \`${OPTION_ANIMATIONS}\` - number > 0 defining the maximum allowed inline lines for animations. Defaults to ${DEFAULT_ANIMATIONS_LIMIT}.
       * \`${OPTION_STYLES}\` - number > 0 defining the maximum allowed inline lines for styles. Defaults to ${DEFAULT_STYLES_LIMIT}.
       * \`${OPTION_TEMPLATE}\` - number > 0 defining the maximum allowed inline lines for template. Defaults to ${DEFAULT_TEMPLATE_LIMIT}.
     `,
@@ -60,14 +66,17 @@ export class Rule extends Rules.AbstractRule {
   }
 }
 
-type PropertyType = 'styles' | 'template';
-
+type PropertyType = 'animations' | 'styles' | 'template';
 export type PropertyPair = { [key in PropertyType]?: number };
 
 const generateFailure = (type: PropertyType, limit: number, value: number): string => {
   return sprintf(Rule.FAILURE_STRING, type, limit, value);
 };
 
+export const getAnimationsFailure = (value: number, limit = DEFAULT_ANIMATIONS_LIMIT): string => {
+  return generateFailure(OPTION_ANIMATIONS, limit, value);
+};
+
 export const getStylesFailure = (value: number, limit = DEFAULT_STYLES_LIMIT): string => {
   return generateFailure(OPTION_STYLES, limit, value);
 };
@@ -77,29 +86,54 @@ export const getTemplateFailure = (value: number, limit = DEFAULT_TEMPLATE_LIMIT
 };
 
 export class MaxInlineDeclarationsWalker extends NgWalker {
+  private readonly animationsLinesLimit = DEFAULT_ANIMATIONS_LIMIT;
   private readonly stylesLinesLimit = DEFAULT_STYLES_LIMIT;
   private readonly templateLinesLimit = DEFAULT_TEMPLATE_LIMIT;
   private readonly newLineRegExp = /\r\n|\r|\n/;
 
   constructor(sourceFile: SourceFile, options: IOptions) {
     super(sourceFile, options);
 
-    const { styles = -1, template = -1 } = (options.ruleArguments[0] || []) as PropertyPair;
+    const { animations = -1, styles = -1, template = -1 } = (options.ruleArguments[0] || []) as PropertyPair;
 
+    this.animationsLinesLimit = animations > -1 ? animations : this.animationsLinesLimit;
     this.stylesLinesLimit = styles > -1 ? styles : this.stylesLinesLimit;
     this.templateLinesLimit = template > -1 ? template : this.templateLinesLimit;
   }
 
   protected visitNgComponent(metadata: ComponentMetadata): void {
-    this.validateInlineTemplate(metadata);
+    this.validateInlineAnimations(metadata);
     this.validateInlineStyles(metadata);
+    this.validateInlineTemplate(metadata);
     super.visitNgComponent(metadata);
   }
 
   private getLinesCount(source: CodeWithSourceMap['source']): number {
     return source!.trim().split(this.newLineRegExp).length;
   }
 
+  private getInlineAnimationsLinesCount(metadata: ComponentMetadata): number {
+    return (metadata.animations || []).reduce((previousValue, currentValue) => {
+      previousValue += this.getLinesCount(currentValue.animation.source);
+
+      return previousValue;
+    }, 0);
+  }
+
+  private validateInlineAnimations(metadata: ComponentMetadata): void {
+    const linesCount = this.getInlineAnimationsLinesCount(metadata);
+
+    if (linesCount <= this.animationsLinesLimit) {
+      return;
+    }
+
+    const failureMessage = getAnimationsFailure(linesCount, this.animationsLinesLimit);
+
+    for (const animation of metadata.animations) {
+      this.addFailureAtNode(animation.node!, failureMessage);
+    }
+  }
+
   private getInlineStylesLinesCount(metadata: ComponentMetadata): number {
     return (metadata.styles || []).reduce((previousValue, currentValue) => {
       if (!currentValue.url) {
@@ -123,6 +157,7 @@ export class MaxInlineDeclarationsWalker extends NgWalker {
       this.addFailureAtNode(style.node!, failureMessage);
     }
   }
+
   private getTemplateLinesCount(metadata: ComponentMetadata): number {
     return this.hasInlineTemplate(metadata) ? this.getLinesCount(metadata.template.template.source) : 0;
   }

src/util/ngQuery.ts

@@ -2,6 +2,14 @@ import * as ts from 'typescript';
 import { decoratorArgument, getInitializer, getStringInitializerFromProperty, isProperty, WithStringInitializer } from './astQuery';
 import { Maybe } from './function';
 
+export function getAnimations(dec: ts.Decorator): Maybe<ts.ArrayLiteralExpression | undefined> {
+  return decoratorArgument(dec).bind(expr => {
+    const property = expr!.properties.find(p => isProperty('animations', p))!;
+
+    return getInitializer(property).fmap(expr => (ts.isArrayLiteralExpression(expr!) ? (expr as ts.ArrayLiteralExpression) : undefined));
+  });
+}
+
 export function getInlineStyle(dec: ts.Decorator): Maybe<ts.ArrayLiteralExpression | undefined> {
   return decoratorArgument(dec).bind(expr => {
     const property = expr!.properties.find(p => isProperty('styles', p))!;