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/**
Edit a list of articles
@param {List<Article>} articles
@param {String} level
@param {Article} newArticle
@return {List<Article>}
*/
function editArticleInList(articles, level, newArticle) {
return articles.map(function(article) {
var articleLevel = article.getLevel();
if (articleLevel === level) {
// it is the article to edit
return article.merge(newArticle);
} else if (level.indexOf(articleLevel) === 0) {
// it is a parent
var articles = editArticleInList(article.getArticles(), level, newArticle);
return article.set('articles', articles);
} else {
// This is not the article you are looking for
return article;
}
});
}
/**
Edit an article in a part
@param {Part} part
@param {String} level
@param {Article} newArticle
@return {Part}
*/
function editArticleInPart(part, level, newArticle) {
var articles = part.getArticles();
articles = editArticleInList(articles, level, newArticle);
return part.set('articles', articles);
}
/**
Edit an article, or a part, in a summary. Does a shallow merge.
@param {Summary} summary
@param {String} level
@param {Article|Part} newValue
@return {Summary}
*/
function mergeAtLevel(summary, level, newValue) {
var levelParts = level.split('.');
var partIndex = Number(levelParts[0]) -1;
var parts = summary.getParts();
var part = parts.get(partIndex);
if (!part) {
return summary;
}
var isEditingPart = levelParts.length < 2;
if (isEditingPart) {
part = part.merge(newValue);
} else {
part = editArticleInPart(part, level, newValue);
}
parts = parts.set(partIndex, part);
return summary.set('parts', parts);
}
module.exports = mergeAtLevel;
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