Extract editor related code

- in public/js/lib/editor/index.js

1 files changed, 46 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..120d3646
--- /dev/null
+++ b/public/js/lib/editor/utils.js
@@ -0,0 +1,46 @@
+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()) {
+                var from = range.from(), 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');
+                    }
+                }
+            }
+        }
+    }
+}