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[FEATURE set-component-template] Initial impl
Co-authored-by: Robert Jackson <me@rwjblue.com>
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39 changes: 39 additions & 0 deletions
39
packages/@ember/-internals/glimmer/lib/utils/component-template.ts
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import { toString } from '@ember/-internals/utils'; | ||
import { assert } from '@ember/debug'; | ||
import { Option } from '@glimmer/interfaces'; | ||
import { Factory as TemplateFactory } from '../template'; | ||
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const TEMPLATES: WeakMap<object, TemplateFactory> = new WeakMap(); | ||
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const getPrototypeOf = Object.getPrototypeOf; | ||
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export function setComponentTemplate(factory: TemplateFactory, obj: object) { | ||
assert( | ||
`Cannot call \`setComponentTemplate\` on \`${toString(obj)}\``, | ||
obj !== null && (typeof obj === 'object' || typeof obj === 'function') | ||
); | ||
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assert( | ||
`Cannot call \`setComponentTemplate\` multiple times on the same class (\`${obj}\`)`, | ||
!TEMPLATES.has(obj) | ||
); | ||
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TEMPLATES.set(obj, factory); | ||
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return obj; | ||
} | ||
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export function getComponentTemplate(obj: object): Option<TemplateFactory> { | ||
let pointer = obj; | ||
while (pointer !== undefined && pointer !== null) { | ||
let template = TEMPLATES.get(pointer); | ||
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if (template !== undefined) { | ||
return template; | ||
} | ||
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pointer = getPrototypeOf(pointer); | ||
} | ||
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return null; | ||
} |
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