From dd6590a0fda614fa2fb0ca9e4ad11b086393372e Mon Sep 17 00:00:00 2001
From: Akshay Nair <phenax5@gmail.com>
Date: Sun, 16 Mar 2025 20:53:33 +0530
Subject: Add simple key sequence parser

---
 src/keymap/KeySeqParser.cpp | 79 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/keymap/KeySeqParser.cpp

(limited to 'src/keymap')

diff --git a/src/keymap/KeySeqParser.cpp b/src/keymap/KeySeqParser.cpp
new file mode 100644
index 0000000..c5534eb
--- /dev/null
+++ b/src/keymap/KeySeqParser.cpp
@@ -0,0 +1,79 @@
+#include <QWidget>
+#include <QtCore>
+#include <algorithm>
+
+#include "keymap/KeySeqParser.hpp"
+
+bool operator==(const KeyChord a, const KeyChord b) {
+  return a.mod == b.mod && a.key == b.key;
+}
+
+KeySeqParser::KeySeqParser() {}
+
+QList<KeyChord> KeySeqParser::parse(QString keySequence) {
+  QList<KeyChord> keyChords;
+  KeyChord lastKey;
+
+  // TODO: Refactor
+  // TODO: Support <C-S-t>
+  keySequence = keySequence.toLower();
+  while (!keySequence.isEmpty()) {
+    int skipCount = 1;
+    if (keySequence.startsWith("<c-")) {
+      int nextClosing = keySequence.indexOf('>');
+      auto keyName = keySequence.sliced(3, nextClosing - 3);
+      lastKey.mod = lastKey.mod | Qt::KeyboardModifier::ControlModifier;
+      lastKey.key = parseKey(keyName);
+      skipCount = nextClosing + 1;
+    } else if (keySequence.startsWith("<s-")) {
+      int nextClosing = keySequence.indexOf('>');
+      auto keyName = keySequence.sliced(3, nextClosing - 3);
+      lastKey.mod = lastKey.mod | Qt::KeyboardModifier::ShiftModifier;
+      lastKey.key = parseKey(keyName);
+      skipCount = nextClosing + 1;
+    } else if (keySequence.startsWith("<")) {
+      int nextClosing = keySequence.indexOf('>');
+      auto keyName = keySequence.sliced(1, nextClosing - 1);
+      lastKey.mod = Qt::KeyboardModifier::NoModifier;
+      lastKey.key = parseKey(keyName);
+      skipCount = nextClosing + 1;
+    } else {
+      auto keyName = keySequence.first(1);
+      lastKey.mod = Qt::KeyboardModifier::NoModifier;
+      lastKey.key = parseKey(keyName);
+    }
+
+    keySequence.slice(std::max(1, skipCount));
+    keyChords.push_back(lastKey);
+    lastKey = KeyChord();
+  }
+
+  return keyChords;
+}
+
+Qt::Key KeySeqParser::parseKey(QString keyName) {
+  if (keyName.length() == 0)
+    return Qt::Key_T; // TODO: tmp
+
+  if (keyName.length() == 1) {
+    char c = keyName.toStdString().at(0);
+    return Qt::Key(Qt::Key_A + (c - 'a'));
+  }
+
+  if (keyName == "space")
+    return Qt::Key_Space;
+
+  if (keyName == "cr")
+    return Qt::Key_Return;
+
+  if (keyName == "esc")
+    return Qt::Key_Escape;
+
+  if (keyName == "bs")
+    return Qt::Key_Backspace;
+
+  if (keyName == "tab")
+    return Qt::Key_Tab;
+
+  return Qt::Key_T;
+}
-- 
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