1 files changed, 109 insertions, 0 deletions
diff --git a/node_modules/istanbul/lib/util/insertion-text.js b/node_modules/istanbul/lib/util/insertion-text.js
new file mode 100644
index 000000000..d257643f2
--- /dev/null
+++ b/node_modules/istanbul/lib/util/insertion-text.js
@@ -0,0 +1,109 @@
+/*
+ Copyright (c) 2012, Yahoo! Inc.  All rights reserved.
+ Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
+ */
+
+function InsertionText(text, consumeBlanks) {
+    this.text = text;
+    this.origLength = text.length;
+    this.offsets = [];
+    this.consumeBlanks = consumeBlanks;
+    this.startPos = this.findFirstNonBlank();
+    this.endPos = this.findLastNonBlank();
+}
+
+var WHITE_RE = /[ \f\n\r\t\v\u00A0\u2028\u2029]/;
+
+InsertionText.prototype = {
+
+    findFirstNonBlank: function () {
+        var pos = -1,
+            text = this.text,
+            len = text.length,
+            i;
+        for (i = 0; i < len; i += 1) {
+            if (!text.charAt(i).match(WHITE_RE)) {
+                pos = i;
+                break;
+            }
+        }
+        return pos;
+    },
+    findLastNonBlank: function () {
+        var text = this.text,
+            len = text.length,
+            pos = text.length + 1,
+            i;
+        for (i = len - 1; i >= 0; i -= 1) {
+            if (!text.charAt(i).match(WHITE_RE)) {
+                pos = i;
+                break;
+            }
+        }
+        return pos;
+    },
+    originalLength: function () {
+        return this.origLength;
+    },
+
+    insertAt: function (col, str, insertBefore, consumeBlanks) {
+        consumeBlanks = typeof consumeBlanks === 'undefined' ? this.consumeBlanks : consumeBlanks;
+        col = col > this.originalLength() ? this.originalLength() : col;
+        col = col < 0 ? 0 : col;
+
+        if (consumeBlanks) {
+            if (col <= this.startPos) {
+                col = 0;
+            }
+            if (col > this.endPos) {
+                col = this.origLength;
+            }
+        }
+
+        var len = str.length,
+            offset = this.findOffset(col, len, insertBefore),
+            realPos = col + offset,
+            text = this.text;
+        this.text = text.substring(0, realPos) + str + text.substring(realPos);
+        return this;
+    },
+
+    findOffset: function (pos, len, insertBefore) {
+        var offsets = this.offsets,
+            offsetObj,
+            cumulativeOffset = 0,
+            i;
+
+        for (i = 0; i < offsets.length; i += 1) {
+            offsetObj = offsets[i];
+            if (offsetObj.pos < pos || (offsetObj.pos === pos && !insertBefore)) {
+                cumulativeOffset += offsetObj.len;
+            }
+            if (offsetObj.pos >= pos) {
+                break;
+            }
+        }
+        if (offsetObj && offsetObj.pos === pos) {
+            offsetObj.len += len;
+        } else {
+            offsets.splice(i, 0, { pos: pos, len: len });
+        }
+        return cumulativeOffset;
+    },
+
+    wrap: function (startPos, startText, endPos, endText, consumeBlanks) {
+        this.insertAt(startPos, startText, true, consumeBlanks);
+        this.insertAt(endPos, endText, false, consumeBlanks);
+        return this;
+    },
+
+    wrapLine: function (startText, endText) {
+        this.wrap(0, startText, this.originalLength(), endText);
+    },
+
+    toString: function () {
+        return this.text;
+    }
+};
+
+module.exports = InsertionText;
+\ No newline at end of file