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1 files changed, 54 insertions, 0 deletions

diff --git a/node_modules/csso/lib/compressor/compress/Dimension.js b/node_modules/csso/lib/compressor/compress/Dimension.js
new file mode 100644
index 00000000..e614ad08
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Dimension.js
@@ -0,0 +1,54 @@
+var packNumber = require('./Number.js').pack;
+var LENGTH_UNIT = {
+    // absolute length units
+    'px': true,
+    'mm': true,
+    'cm': true,
+    'in': true,
+    'pt': true,
+    'pc': true,
+
+    // relative length units
+    'em': true,
+    'ex': true,
+    'ch': true,
+    'rem': true,
+
+    // viewport-percentage lengths
+    'vh': true,
+    'vw': true,
+    'vmin': true,
+    'vmax': true,
+    'vm': true
+};
+
+module.exports = function compressDimension(node, item) {
+    var value = packNumber(node.value);
+
+    node.value = value;
+
+    if (value === '0' && this.declaration) {
+        var unit = node.unit.toLowerCase();
+
+        // only length values can be compressed
+        if (!LENGTH_UNIT.hasOwnProperty(unit)) {
+            return;
+        }
+
+        // issue #200: don't remove units in flex property as it could change value meaning
+        if (this.declaration.property.name === 'flex') {
+            return;
+        }
+
+        // issue #222: don't remove units inside calc
+        if (this['function'] && this['function'].name === 'calc') {
+            return;
+        }
+
+        item.data = {
+            type: 'Number',
+            info: node.info,
+            value: value
+        };
+    }
+};