1 files changed, 48 insertions, 0 deletions
diff --git a/public/js/lib/editor/utils.js b/public/js/lib/editor/utils.js
new file mode 100644
index 00000000..3702a166
--- /dev/null
+++ b/public/js/lib/editor/utils.js
@@ -0,0 +1,48 @@
+const wrapSymbols = ['*', '_', '~', '^', '+', '=']
+export function wrapTextWith (editor, cm, symbol) {
+  if (!cm.getSelection()) {
+    return CodeMirror.Pass
+  } else {
+    var ranges = cm.listSelections()
+    for (var i = 0; i < ranges.length; i++) {
+      var range = ranges[i]
+      if (!range.empty()) {
+        const from = range.from()
+        const to = range.to()
+
+        if (symbol !== 'Backspace') {
+          cm.replaceRange(symbol, to, to, '+input')
+          cm.replaceRange(symbol, from, from, '+input')
+          // workaround selection range not correct after add symbol
+          var _ranges = cm.listSelections()
+          var anchorIndex = editor.indexFromPos(_ranges[i].anchor)
+          var headIndex = editor.indexFromPos(_ranges[i].head)
+          if (anchorIndex > headIndex) {
+            _ranges[i].anchor.ch--
+          } else {
+            _ranges[i].head.ch--
+          }
+          cm.setSelections(_ranges)
+        } else {
+          var preEndPos = {
+            line: to.line,
+            ch: to.ch + 1
+          }
+          var preText = cm.getRange(to, preEndPos)
+          var preIndex = wrapSymbols.indexOf(preText)
+          var postEndPos = {
+            line: from.line,
+            ch: from.ch - 1
+          }
+          var postText = cm.getRange(postEndPos, from)
+          var postIndex = wrapSymbols.indexOf(postText)
+          // check if surround symbol are list in array and matched
+          if (preIndex > -1 && postIndex > -1 && preIndex === postIndex) {
+            cm.replaceRange('', to, preEndPos, '+delete')
+            cm.replaceRange('', postEndPos, from, '+delete')
+          }
+        }
+      }
+    }
+  }
+}