| 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); |
| } |