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twitter.com/mgechev github.com/mgechev blog.mgechev.com Mad science with the Angular Compiler twitter.com/mgechev github.com/mgechev blog.mgechev.com

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twitter.com/mgechev twitter.com/mgechev twitter.com/mgechev github.com/mgechev

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twitter.com/mgechev twitter.com/mgechev EBGES050 50% off ebook PBGSA15 15% off book

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twitter.com/mgechev twitter.com/mgechev The compiler transforms the source code of an Angular application for achieving higher efficiency.

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twitter.com/mgechev twitter.com/mgechev @Component({ selector: 'header-cmp', template: ` {{ title }} ` }) class HeaderComponent { ... }

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twitter.com/mgechev twitter.com/mgechev @Component({ selector: 'header-cmp', template: ` {{ title }} ` }) class HeaderComponent { ... } class _View_HeaderComponent extends import1.AppView { constructor(...) { ... } createInternal(...):import3.AppElement { ... } injectorGetInternal(...):any { ... } }

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twitter.com/mgechev Angular Compiler • Efficient views • Efficient providers instantiation Generates…

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Transformation

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twitter.com/mgechev Is that all we can do?

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twitter.com/mgechev Of Course Not… • Analyze the source code • Visualize the source code • Much more…

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twitter.com/mgechev How a compiler works?

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twitter.com/mgechev Compiler COMPILER Input Output

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twitter.com/mgechev Compiler COMPILER
 
 
 
 FRONT-END BACK-END Input Output

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twitter.com/mgechev Compiler Input Output FRONT-END

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twitter.com/mgechev FRONT-END
 
 
 
 Compiler LEXICAL ANALYSIS SYNTAX ANALYSIS … Input Output …

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twitter.com/mgechev Lexical Analysis tokenize('const product = a * b;')

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twitter.com/mgechev Lexical Analysis tokenize('const product = a * b;')

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twitter.com/mgechev Lexical Analysis tokenize('const product = a * b;') [ { lexeme: 'const', type: 'keyword' }, { lexeme: 'product', type: 'identifier' }, { lexeme: '=', type: 'operator' }, ... ]

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twitter.com/mgechev Syntax Analysis parse(tokenize('...'))

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twitter.com/mgechev Syntax Analysis parse(tokenize('...')) CONST PRODUCT * A B

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twitter.com/mgechev Syntax Analysis parse(tokenize('...')) AST CONST PRODUCT * A B

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twitter.com/mgechev Static Analysis

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twitter.com/mgechev twitter.com/mgechev Static program analysis is the analysis of computer software that is performed without actually executing programs. Wikipedia

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twitter.com/mgechev github.com/mgechev codelyzer

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twitter.com/mgechev tsc

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twitter.com/mgechev tslint

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twitter.com/mgechev

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twitter.com/mgechev tsc.parse( tokenize(` @Component({ selector: '[tooltip]', template: '...' }) class TooltipComponent { ... } `) );

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twitter.com/mgechev ast = tsc.parse( tsc.tokenize(` @Component({ selector: '[tooltip]', template: '...' }) class TooltipComponent { ... } `) );

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twitter.com/mgechev ast = tsc.parse( tsc.tokenize(` @Component({ selector: '[tooltip]', template: '...' }) class TooltipComponent { ... } `) );

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twitter.com/mgechev tokenize(` @Component({ selector: '[tooltip]', template: '...' }) class TooltipComponent { ... } `) );

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twitter.com/mgechev tokenize(` @Component({ selector: '[tooltip]', template: '...' }) class TooltipComponent { ... } `) ); CLASS DECORATOR OBJ LITERAL SELECTOR [TOOLTIP] TEMPLATE ‘…’ PROPERTY[0] PROPERTY[1]

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twitter.com/mgechev Validate Selector visitClass(node) { node.decorators.forEach(visitDecorator); } visitDecorator(node) { if (node.name === 'Component') { visitComponentMetadata(readMetadata(node)) } } visitComponentMetadata(metadata) { if (!parseSelector(metadata.selector).element) { tslint.report('Components should have element selectors'); } }

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twitter.com/mgechev Validate Selector visitClass(node) visitDecorator(node) visitComponentMetadata(metadata) CLASS DECORATOR OBJ LITERAL SELECTOR [TOOLTIP] TEMPLATE ‘…’ PROPERTY[0] PROPERTY[1]

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twitter.com/mgechev Validate Selector visitClass(node) visitDecorator(node) visitComponentMetadata(metadata) CLASS DECORATOR OBJ LITERAL SELECTOR [TOOLTIP] TEMPLATE ‘…’ PROPERTY[0] PROPERTY[1]

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twitter.com/mgechev Validate Selector visitClass(node) visitDecorator(node) visitComponentMetadata(metadata) CLASS DECORATOR OBJ LITERAL SELECTOR [TOOLTIP] TEMPLATE ‘…’ PROPERTY[0] PROPERTY[1]

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twitter.com/mgechev Validate Selector visitClass(node) visitDecorator(node) visitComponentMetadata(metadata) CLASS DECORATOR OBJ LITERAL SELECTOR [TOOLTIP] TEMPLATE ‘…’ PROPERTY[0] PROPERTY[1]

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twitter.com/mgechev Validate Selector visitClass(node) visitDecorator(node) visitComponentMetadata(metadata) CLASS DECORATOR OBJ LITERAL SELECTOR [TOOLTIP] TEMPLATE ‘…’ PROPERTY[0] PROPERTY[1]

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twitter.com/mgechev Analysis of Styles and Templates

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twitter.com/mgechev twitter.com/mgechev @Component({ selector: 'header-cmp', template: `

Hello {{ name }}! `, styles: [` .greeting spam { color: red; } `] }) class HeaderComponent { ... }

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twitter.com/mgechev twitter.com/mgechev @Component({ selector: 'header-cmp', template: `

Hello {{ name }}! `, styles: [` .greeting spam { color: red; } `] }) class HeaderComponent { ... }

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twitter.com/mgechev twitter.com/mgechev TEMPLATE AST DIV.GREETING SPAN COMPONENT STYLES AST CSS RULE SELECTOR .GREETING SPAM …
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.greeting spam { color: red; }

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twitter.com/mgechev Breaking Changes

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twitter.com/mgechev Smooth Upgrade to v4 $ npm install @angular/ {common,compiler,compiler-cli, core,forms,http,platform-browser, platform-browser-dynamic, platform-server,router,animations} @^4.0.0 typescript@^2.2.2 --save --save-exact

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twitter.com/mgechev Smooth Upgrade to v4 …with a few deprecations $ npm install @angular/ {common,compiler,compiler-cli, core,forms,http,platform-browser, platform-browser-dynamic, platform-server,router,animations} @^4.0.0 typescript@^2.2.2 --save --save-exact

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twitter.com/mgechev twitter.com/mgechev Renderer RendererType RendererFactory

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twitter.com/mgechev twitter.com/mgechev Renderer RendererType RendererFactory Renderer2 RendererType2 RendererFactory2

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twitter.com/mgechev s/

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twitter.com/mgechev twitter.com/mgechev @Component({ selector: 'content-cmp', template: '' }) class ContentComponent { content = ' is an HTML5 element'; }

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twitter.com/mgechev twitter.com/mgechev @Component({ selector: 'content-cmp', template: '' }) class ContentComponent { content = ' is an HTML5 element'; }

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twitter.com/mgechev Context Aware Replacement TEMPLATE AST TEMPLATE COMPONENT Demonstration github.com/mgechev/ngmigrate

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twitter.com/mgechev Code Visualization

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Large Software Systems are Complex

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twitter.com/mgechev Understanding Large System • A lot of code which is hard to digest • Mixing different levels of abstractions • Humans are good in “visual thinking”

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twitter.com/mgechev compiler provides primitives for parsing an Angular application

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twitter.com/mgechev github.com/mgechev/ ngast

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twitter.com/mgechev ngast provides • Directives / components and their metadata • Providers and their relations • etc… A way to get all:

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twitter.com/mgechev twitter.com/mgechev github.com/mgechev/ ngrev

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twitter.com/mgechev lets go one dimension above

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twitter.com/mgechev We’re putting our source code in our own reality, instead, lets move to its own reality!

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twitter.com/mgechev Visualization github.com/mgechev/ngworld Demonstration

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twitter.com/mgechev

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Thank you! twitter.com/mgechev github.com/mgechev blog.mgechev.com