46 lines
1.4 KiB
Plaintext
46 lines
1.4 KiB
Plaintext
import getValue, { getLiteralValue } from './values';
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const extractValue = (attribute, extractor) => {
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if (attribute && attribute.type === 'JSXAttribute') {
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if (attribute.value === null) {
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// Null valued attributes imply truthiness.
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// For example: <div aria-hidden />
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// See: https://facebook.github.io/react/docs/jsx-in-depth.html#boolean-attributes
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return true;
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}
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return extractor(attribute.value);
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}
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return undefined;
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};
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/**
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* Returns the value of a given attribute.
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* Different types of attributes have their associated
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* values in different properties on the object.
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*
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* This function should return the most *closely* associated
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* value with the intention of the JSX.
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*
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* @param attribute - The JSXAttribute collected by AST parser.
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*/
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export default function getPropValue(attribute) {
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return extractValue(attribute, getValue);
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}
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/**
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* Returns the value of a given attribute.
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* Different types of attributes have their associated
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* values in different properties on the object.
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*
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* This function should return a value only if we can extract
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* a literal value from its attribute (i.e. values that have generic
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* types in JavaScript - strings, numbers, booleans, etc.)
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*
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* @param attribute - The JSXAttribute collected by AST parser.
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*/
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export function getLiteralPropValue(attribute) {
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return extractValue(attribute, getLiteralValue);
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}
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