1 files changed, 172 insertions, 0 deletions
diff --git a/packages/gitbook-html/src/totext.js b/packages/gitbook-html/src/totext.js
new file mode 100644
index 0000000..6e71cd3
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+++ b/packages/gitbook-html/src/totext.js
@@ -0,0 +1,172 @@
+
+/*
+    This class is extended by gitbook-markdown and gitbook-asciidoc
+    to generate back markdown/asciidoc from GitBook metadata.
+*/
+
+class ToText {
+    constructor(markup) {
+        Object.assign(this, markup);
+    }
+
+    // Break line
+    onBL() {
+        return '\n';
+    }
+
+    onText(text) {
+        return text;
+    }
+
+    onHR() {
+        return '<hr />';
+    }
+
+    // ---- TITLES
+
+    onTitleStart(level) {
+        return '<h' + level + '>';
+    }
+    onTitleEnd(level) {
+        return '</h' + level + '>';
+    }
+
+    // ---- PARAGRAPHS / SECTIONS
+    onParagraphStart() {
+        return '<p>';
+    }
+    onParagraphEnd() {
+        return '</p>';
+    }
+
+
+    onSection() {
+        return this.onBL();
+    }
+
+    // ---- LINKS
+    onLinkStart(href) {
+        return '<a href="' + href + '">';
+    }
+    onLinkEnd(href) {
+        return '</a>';
+    }
+
+    // ---- LISTS
+    onListItemStart(level) {
+        return this._spaces((level + 1) * 4) + '<li>';
+    }
+    onListItemEnd(level) {
+        return this._spaces((level + 1) * 4) + '</li>' + this.onBL();
+    }
+    onListStart(level) {
+        return this._spaces(level * 4) + '<ul>' + this.onBL();
+    }
+    onListEnd(level) {
+        return this._spaces(level * 4) + '</ul>' + this.onBL();
+    }
+
+    // ------ LANGS
+
+    langs(languages) {
+        let content = '';
+        content += this.onTitleStart(1) + this.onText('Languages') + this.onTitleEnd(1);
+        content += this.onSection();
+
+        content += this._summaryArticles(languages);
+
+        return content;
+    }
+
+    // ------ GLOSSARY
+
+    glossary(glossary) {
+        let content = '';
+
+        content += this.onTitleStart(1) + this.onText('Glossary') + this.onTitleEnd(1);
+        content += this.onSection();
+
+        glossary.forEach((entry) => {
+            content += this.onTitleStart(2) + this.onText(entry.name) + this.onTitleEnd(2);
+            content += this.onParagraphStart();
+            content += this.onText(entry.description);
+            content += this.onParagraphEnd();
+            content += this.onSection();
+        });
+
+        return content;
+    }
+
+    // ------ SUMMARY
+
+    _summaryArticle(article, level) {
+        let content = '';
+
+        content += this.onListItemStart(level);
+
+        if (article.ref) content += this.onLinkStart(article.ref);
+        content += this.onText(article.title);
+        if (article.ref) content += this.onLinkEnd(article.ref);
+        content += this.onBL();
+
+        if (article.articles && article.articles.length > 0) {
+            content += this._summaryArticles(article.articles, level + 1);
+        }
+
+        content += this.onListItemEnd(level);
+
+        return content;
+    }
+    _summaryArticles(articles, level) {
+        let content = '';
+
+        level = level || 0;
+
+        content += this.onListStart(level);
+        articles.forEach((article) => {
+            content += this._summaryArticle(article, level);
+        });
+        content += this.onListEnd(level);
+
+        return content;
+    }
+    _summaryPart(part) {
+        let content = '';
+
+        if (part.title) content += this.onTitleStart(2) + this.onText(part.title) + this.onTitleEnd(2);
+
+        content += this._summaryArticles(part.articles);
+
+        return content;
+    }
+
+    summary(summary) {
+        let content = '';
+
+        content += this.onTitleStart(1) + this.onText('Summary') + this.onTitleEnd(1);
+        content += this.onSection();
+
+        summary.parts.forEach((part, i) => {
+            const next = summary.parts[i + 1];
+
+            content += this._summaryPart(part);
+
+            if (next && !next.title) {
+                content += this.onBL() + this.onHR() + this.onBL();
+            } else {
+                content += this.onSection();
+            }
+
+        });
+
+        return content;
+    }
+
+    // ---- Utilities
+
+    _spaces(n, s) {
+        return Array(n + 1).join(s || ' ');
+    }
+}
+
+module.exports = ToText;