From f02ccb928fd4ed591d2efe118a571e154f5df68a Mon Sep 17 00:00:00 2001
From: "Felix (xq) Queißner" <git@mq32.de>
Date: Mon, 8 Jun 2020 00:30:32 +0200
Subject: Starts to implement gopher protocol and gophermap support. Heavily
 WIP, but you can already surf on gopherspace!

---
 src/gophermaprenderer.cpp | 164 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 src/gophermaprenderer.cpp

(limited to 'src/gophermaprenderer.cpp')

diff --git a/src/gophermaprenderer.cpp b/src/gophermaprenderer.cpp
new file mode 100644
index 0000000..bcdf11f
--- /dev/null
+++ b/src/gophermaprenderer.cpp
@@ -0,0 +1,164 @@
+#include "gophermaprenderer.hpp"
+
+#include <QTextList>
+#include <QTextBlock>
+#include <QList>
+#include <QStringList>
+#include <QTextImageFormat>
+
+#include <QDebug>
+
+//Canonical Types
+//0   Text File
+//1   Gopher submenu or link to another gopher server
+//2   CCSO Nameserver
+//3   Error code returned by a Gopher server to indicate failure
+//4   BinHex-encoded file (primarily for Macintosh computers)
+//5   DOS file
+//6   uuencoded file
+//7   Gopher full-text search
+//8   Telnet
+//9   Binary file
+//+   Mirror or alternate server (for load balancing or in case of primary server downtime)
+//g   GIF file
+//I   Image file
+//T   Telnet 3270
+//Non-Canonical Types
+//h   HTML file
+//i   Informational message
+//s   Sound file
+
+std::unique_ptr<QTextDocument> GophermapRenderer::render(const QByteArray &input, const QUrl &root_url, const DocumentStyle &themed_style)
+{
+    QTextCharFormat standard;
+    standard.setFont(themed_style.standard_font);
+    standard.setForeground(themed_style.standard_color);
+
+    QTextCharFormat standard_link;
+    standard_link.setFont(themed_style.standard_font);
+    standard_link.setForeground(QBrush(themed_style.internal_link_color));
+
+    QTextCharFormat external_link;
+    external_link.setFont(themed_style.standard_font);
+    external_link.setForeground(QBrush(themed_style.external_link_color));
+
+    std::unique_ptr<QTextDocument> result = std::make_unique<QTextDocument>();
+    result->setDocumentMargin(themed_style.margin);
+
+    QTextCursor cursor{result.get()};
+
+    QTextBlockFormat non_list_format = cursor.blockFormat();
+
+    QList<QByteArray> lines = input.split('\n');
+    for (auto const & line : lines)
+    {
+        if (line.length() < 2) // skip lines without
+            continue;
+
+        if(line[line.size() - 1] != '\r')
+            continue;
+
+        auto items = line.mid(1, line.length() - 2).split('\t');
+        if(items.size() < 2) // invalid
+            continue;
+
+        QString icon;
+        switch (line.at(0))
+        {
+        case '0': // Text File
+            icon = "text";
+            break;
+        case '1': // Gopher submenu or link to another gopher server
+            icon = "directory";
+            break;
+        case '2': // CCSO Nameserver
+            icon = "ns";
+            break;
+        case '3': // Error code returned by a Gopher server to indicate failure
+            icon = "error";
+            break;
+        case '4': // BinHex-encoded file (primarily for Macintosh computers)
+            icon = "binhex";
+            break;
+        case '5': // DOS file
+            icon = "dos";
+            break;
+        case '6': // uuencoded file
+            icon = "uuencoded";
+            break;
+        case '7': // Gopher full-text search
+            icon = "full-text";
+            break;
+        case '8': // Telnet
+            icon = "telnet";
+            break;
+        case '9': // Binary file
+            icon = "binary";
+            break;
+        case '+': // Mirror or alternate server (for load balancing or in case of primary server downtime)
+            icon = "mirror";
+            break;
+        case 'g': // GIF file
+            icon = "gif";
+            break;
+        case 'I': // Image file
+            icon = "image";
+            break;
+        case 'T': // Telnet 3270
+            icon = "telnet";
+            break;
+        //Non-Canonical Types
+        case 'h': // HTML file
+            icon = "html";
+            break;
+        case 'i': // Informational message
+            icon = "informational";
+            break;
+        case 's': // Sound file
+            icon = "sound";
+            break;
+        default:  // unknown
+            continue;
+        }
+
+        QString title = items.at(0);
+
+        // 1Phlog	/phlog	octotherp.org	70	+
+
+        if(line.at(0) == 'i')
+        {
+            cursor.insertText(title + "\n", standard);
+        }
+        else
+        {
+            QString dst_url;
+            switch(items.size())
+            {
+            case 0: assert(false);
+            case 1: assert(false);
+            case 2:
+                dst_url = root_url.resolved(QUrl(items.at(1))).toString();
+                break;
+            case 3:
+                dst_url = "gopher://" + items.at(2) + "/" + line.mid(0,1) + items.at(1);
+                break;
+            default:
+                dst_url = "gopher://" + items.at(2) + ":" + items.at(3) + "/" + line.mid(0,1) + items.at(1);
+                break;
+            }
+
+            if(not QUrl(dst_url).isValid()) {
+                // invlaid URL generated
+                qDebug() << line << dst_url;
+            }
+
+
+            QTextCharFormat fmt = standard_link;
+            fmt.setAnchor(true);
+            fmt.setAnchorHref(dst_url);
+            cursor.insertText(title + "\n", fmt);
+        }
+    }
+
+    return result;
+}
-- 
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