1 files changed, 70 insertions, 0 deletions
diff --git a/lib/modifiers/summary/editArticle.js b/lib/modifiers/summary/editArticle.js
new file mode 100644
index 0000000..1625398
--- /dev/null
+++ b/lib/modifiers/summary/editArticle.js
@@ -0,0 +1,70 @@
+
+/**
+    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) {
+            return article.merge(newArticle);
+        }
+
+        if (level.indexOf(articleLevel) === 0) {
+            var articles = editArticleInList(article.getArticles(), level, newArticle);
+            return article.set('articles', articles);
+        }
+
+        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);
+
+    return part.set('articles', articles);
+}
+
+
+/**
+    Edit an article in a summary
+
+    @param {Summary} summary
+    @param {String} level
+    @param {Article} newArticle
+    @return {Summary}
+*/
+function editArticle(summary, level, newArticle) {
+    var parts = summary.getParts();
+
+    var levelParts = level.split('.');
+    var partIndex = Number(levelParts[0]);
+
+    var part = parts.get(partIndex);
+    if (!part) {
+        return summary;
+    }
+
+    part = editArticleInPart(part, level, newArticle);
+    parts = parts.set(partIndex, part);
+
+    return summary.set('parts', parts);
+}
+
+
+module.exports = editArticle;