Add EditSession.getFoldsInRange function + unit tests

lib/ace/edit_session.js

@@ -1427,6 +1427,7 @@ var EditSession = function(text, mode) {
      * Simple fold-data struct.
      **/
     function Fold(range, placeholder) {
+        this.foldLine = null;
         this.placeholder = placeholder;
         this.range = range;
         this.start = range.start;
@@ -1441,18 +1442,20 @@ var EditSession = function(text, mode) {
      */
     function FoldLine(folds) {
         if (Array.isArray(folds)) {
-            var last = folds[folds.length - 1]
             this.folds = folds;
-            this.range = new Range(folds[0].start.row, folds[0].start.column,
-                                   last.end.row, last.end.column);
-            this.start = this.range.start;
-            this.end   = this.range.end;
         } else {
-            this.folds = [folds];
+            folds = this.folds = [ folds ];
-            this.range = folds.range.clone();
-            this.start = this.range.start;
-            this.end   = this.range.end;
         }
+
+        var last = folds[folds.length - 1]
+        this.range = new Range(folds[0].start.row, folds[0].start.column,
+                               last.end.row, last.end.column);
+        this.start = this.range.start;
+        this.end   = this.range.end;
+
+        this.folds.forEach(function(fold) {
+            fold.foldLine = this;
+        }, this);
     }
 
     (function() {
@@ -1643,6 +1646,43 @@ var EditSession = function(text, mode) {
         }
     }
 
+    /**
+     * Returns all folds in the given range. Note, that this will return folds
+     *
+     */
+    this.getFoldsInRange = function(range) {
+        var start = range.start,
+            end = range.end;
+        var foldLines = this.$foldData,
+            folds,
+            fold;
+        var cmp,
+            foundFolds = [];
+        for (var i = 0; i < foldLines.length; i++) {
+            cmp = foldLines[i].range.compare(start.row, start.column + 1);
+            if (cmp == 1) {
+                break;
+            } else if (cmp == -1) {
+                cmp = foldLines[i].range.compare(end.row, end.column - 1);
+                if (cmp == -1) {
+                    break;
+                }
+            }
+
+            folds = foldLines[i].folds;
+            for (var j = 0; j < folds.length; j++) {
+                fold = folds[j];
+                cmp = fold.range.compare(end.row, end.column + 1);
+                if (cmp == -1) {
+                    break;
+                } else {
+                    foundFolds.push(fold);
+                }
+            }
+        }
+        return foundFolds;
+    }
+
     /**
      * Returns the string between folds at the given position.
      * E.g.

lib/ace/edit_session_test.js

@@ -541,6 +541,29 @@ module.exports = {
         assert.range(foldLines[2].range, 6, 13, 6, 18);
 
         // TODO: Add test for inseration inside of folds.
+    },
+
+    "test getFoldsInRange()": function() {
+        var session = createFoldTestSession(),
+            foldLines = session.$foldData;
+            folds = foldLines[0].folds.concat(foldLines[1].folds);
+
+        function test(startRow, startColumn, endColumn, endRow, folds) {
+            var r = new Range(startRow, startColumn, endColumn, endRow);
+            var retFolds = session.getFoldsInRange(r);
+
+            assert.ok(retFolds.length == folds.length);
+            for (var i = 0; i < retFolds.length; i++) {
+                assert.equal(retFolds[i].range + "", folds[i].range + "");
+            }
+        }
+
+        test(0, 0, 0, 13,  [ ]);
+        test(0, 0, 0, 14,  [ folds[0] ]);
+        test(0, 0, 0, 18,  [ folds[0] ]);
+        test(0, 0, 1, 10,  [ folds[0] ]);
+        test(0, 0, 1, 11,  [ folds[0], folds[1] ]);
+        test(0, 18, 1, 11, [ folds[1] ]);
     }
 };