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const visit = require('unist-util-visit');
/**
* Given the MDAST ast, look for all fenced Blockquote
*
* @param {object} ast
* @param {vFile} vFile
* @return {function}
*/
function visitBlockquote(ast) {
return visit(ast, 'blockquote', (node, index, parent) => {
const firstNode = node.children[0];
if (firstNode.type === 'paragraph') {
if (firstNode.children[0].type === 'text') {
const firstChild = firstNode.children[0];
if (firstChild.value.startsWith('!secret')) {
node.type = 'div';
firstChild.value = firstChild.value.substr(7);
let sum = '';
if (firstChild.value.indexOf('\n') >= 0) {
sum = firstChild.value.substr(0,
firstChild.value.indexOf('\n'));
firstChild.value = firstChild.value.substr(
firstChild.value.indexOf('\n'));
} else {
sum = firstChild.value;
firstChild.value = '';
}
const secret = {
type: 'special-box-secret',
children: [
node,
{
type: 'summary',
data: {
hName: 'summary',
hChildren: [{
type: 'text',
value: sum || 'Spoiler',
}],
},
},
],
data: {
hName: 'details',
hProperties: {
className: 'special-box secret',
},
},
};
parent.children.splice(index, 1, secret);
return node;
} else if (firstChild.value.startsWith('!information') ||
firstChild.value.startsWith('!good') ||
firstChild.value.startsWith('!bad') ||
firstChild.value.startsWith('!comment') ||
firstChild.value.startsWith('!attention') ||
firstChild.value.startsWith('!question')) {
node.type = 'div';
node.data = {
hName: 'div',
hProperties: {
className: 'special-box-content',
},
};
let type = '';
if (firstChild.value.indexOf('\n') > 0) {
type = firstChild.value.substr(1, firstChild.value.indexOf('\n'));
firstChild.value = firstChild.value.substr(firstChild.value.indexOf('\n'));
} else {
type = firstChild.value.substr(1);
firstChild.value = '';
}
const box = {
type: 'special-box-div',
children: [node],
data: {
hName: 'div',
hProperties: {
className: `special-box ${type}`,
},
},
};
parent.children.splice(index, 1, box);
return node;
}
}
}
return node;
});
}
/**
* Returns the transformer which acst on the MDAST tree and given VFile.
*
* @link https://github.com/unifiedjs/unified#function-transformernode-file-next
* @link https://github.com/syntax-tree/mdast
* @link https://github.com/vfile/vfile
* @return {function}
*/
function box() {
/**
* @param {object} ast MDAST
* @param {vFile} vFile
* @param {function} next
* @return {object}
*/
return function (ast, vFile, next) { // Transformer
visitBlockquote(ast);
if (typeof next === 'function') {
return next(null, ast, vFile);
}
return ast;
};
}
module.exports = box;
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