Libraries: Add LibMarkdown

Libraries/LibMarkdown/MDParagraph.cpp

@@ -0,0 +1,66 @@
+#include <AK/StringBuilder.h>
+#include <LibMarkdown/MDParagraph.h>
+
+String MDParagraph::render_to_html() const
+{
+    StringBuilder builder;
+    builder.appendf("<p>");
+    builder.append(m_text.render_to_html());
+    builder.appendf("</p>\n");
+    return builder.build();
+}
+
+String MDParagraph::render_for_terminal() const
+{
+    StringBuilder builder;
+    builder.append(m_text.render_for_terminal());
+    builder.appendf("\n\n");
+    return builder.build();
+}
+
+bool MDParagraph::parse(Vector<StringView>::ConstIterator& lines)
+{
+    if (lines.is_end())
+        return false;
+
+    bool first = true;
+    StringBuilder builder;
+
+    while (true) {
+        if (lines.is_end())
+            break;
+        StringView line = *lines;
+        if (line.is_empty())
+            break;
+        char ch = line[0];
+        // See if it looks like a blockquote
+        // or like an indented block.
+        if (ch == '>' || ch == ' ')
+            break;
+        if (line.length() > 1) {
+            // See if it looks like a heading.
+            if (ch == '#' && (line[1] == '#' || line[1] == ' '))
+                break;
+            // See if it looks like a code block.
+            if (ch == '`' && line[1] == '`')
+                break;
+            // See if it looks like a list.
+            if (ch == '*' || ch == '-')
+                if (line[1] == ' ')
+                    break;
+        }
+
+        if (!first)
+            builder.append(' ');
+        builder.append(line);
+        first = false;
+        ++lines;
+    }
+
+    if (first)
+        return false;
+
+    bool success = m_text.parse(builder.build());
+    ASSERT(success);
+    return true;
+}