/* @flow */
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// helper to process dynamic keys for dynamic arguments in v-bind and v-on.
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// For example, the following template:
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//
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// <div id="app" :[key]="value">
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//
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// compiles to the following:
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//
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// _c('div', { attrs: bindDynamicKeys({ "id": "app" }, [key, value]) })
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import { warn } from 'core/util/debug'
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export function bindDynamicKeys (baseObj: Object, values: Array<any>): Object {
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for (let i = 0; i < values.length; i += 2) {
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const key = values[i]
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if (typeof key === 'string' && key) {
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baseObj[values[i]] = values[i + 1]
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} else if (process.env.NODE_ENV !== 'production' && key !== '' && key !== null) {
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// null is a special value for explicitly removing a binding
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warn(
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`Invalid value for dynamic directive argument (expected string or null): ${key}`,
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this
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)
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}
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}
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return baseObj
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}
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// helper to dynamically append modifier runtime markers to event names.
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// ensure only append when value is already string, otherwise it will be cast
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// to string and cause the type check to miss.
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export function prependModifier (value: any, symbol: string): any {
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return typeof value === 'string' ? symbol + value : value
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}
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