1 files changed, 64 insertions, 0 deletions
diff --git a/src/client/util/toCSSLineSpacing.js b/src/client/util/toCSSLineSpacing.js
new file mode 100644
index 000000000..939d11a0e
--- /dev/null
+++ b/src/client/util/toCSSLineSpacing.js
@@ -0,0 +1,64 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = toCSSLineSpacing;
+
+
+// Line spacing names and their values.
+var LINE_SPACING_100 = exports.LINE_SPACING_100 = '125%';
+var LINE_SPACING_115 = exports.LINE_SPACING_115 = '138%';
+var LINE_SPACING_150 = exports.LINE_SPACING_150 = '165%';
+var LINE_SPACING_200 = exports.LINE_SPACING_200 = '232%';
+
+var SINGLE_LINE_SPACING = exports.SINGLE_LINE_SPACING = LINE_SPACING_100;
+var DOUBLE_LINE_SPACING = exports.DOUBLE_LINE_SPACING = LINE_SPACING_200;
+
+var NUMBER_VALUE_PATTERN = /^\d+(.\d+)?$/;
+
+// Normalize the css line-height vlaue to percentage-based value if applicable.
+// Also, it calibrates the incorrect line spacing value exported from Google
+// Doc.
+function toCSSLineSpacing(source) {
+    if (!source) {
+        return '';
+    }
+
+    var strValue = String(source);
+
+    // e.g. line-height: 1.5;
+    if (NUMBER_VALUE_PATTERN.test(strValue)) {
+        var numValue = parseFloat(strValue);
+        strValue = String(Math.round(numValue * 100)) + '%';
+    }
+
+    // Google Doc exports line spacing with wrong values. For instance:
+    // - Single => 100%
+    // - 1.15 => 115%
+    // - Double => 200%
+    // But the actual CSS value measured in Google Doc is like this:
+    // - Single => 125%
+    // - 1.15 => 138%
+    // - Double => 232%
+    // The following `if` block will calibrate the value if applicable.
+
+    if (strValue === '100%') {
+        return LINE_SPACING_100;
+    }
+
+    if (strValue === '115%') {
+        return LINE_SPACING_115;
+    }
+
+    if (strValue === '150%') {
+        return LINE_SPACING_150;
+    }
+
+    if (strValue === '200%') {
+        return LINE_SPACING_200;
+    }
+
+    // e.g. line-height: 15px;
+    return strValue;
+}
+\ No newline at end of file