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/* @flow */
import type { Key } from 'react';
import formatReactElementNode from './formatReactElementNode';
import type { Options } from './../options';
import type {
ReactElementTreeNode,
ReactFragmentTreeNode,
TreeNode,
} from './../tree';
const REACT_FRAGMENT_TAG_NAME_SHORT_SYNTAX = '';
const REACT_FRAGMENT_TAG_NAME_EXPLICIT_SYNTAX = 'React.Fragment';
const toReactElementTreeNode = (
displayName: string,
key: ?Key,
childrens: TreeNode[]
): ReactElementTreeNode => {
let props = {};
if (key) {
props = { key };
}
return {
type: 'ReactElement',
displayName,
props,
defaultProps: {},
childrens,
};
};
const isKeyedFragment = ({ key }: ReactFragmentTreeNode) => Boolean(key);
const hasNoChildren = ({ childrens }: ReactFragmentTreeNode) =>
childrens.length === 0;
export default (
node: ReactFragmentTreeNode,
inline: boolean,
lvl: number,
options: Options
): string => {
const { type, key, childrens } = node;
if (type !== 'ReactFragment') {
throw new Error(
`The "formatReactFragmentNode" function could only format node of type "ReactFragment". Given: ${
type
}`
);
}
const { useFragmentShortSyntax } = options;
let displayName;
if (useFragmentShortSyntax) {
if (hasNoChildren(node) || isKeyedFragment(node)) {
displayName = REACT_FRAGMENT_TAG_NAME_EXPLICIT_SYNTAX;
} else {
displayName = REACT_FRAGMENT_TAG_NAME_SHORT_SYNTAX;
}
} else {
displayName = REACT_FRAGMENT_TAG_NAME_EXPLICIT_SYNTAX;
}
return formatReactElementNode(
toReactElementTreeNode(displayName, key, childrens),
inline,
lvl,
options
);
};
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