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