feat: support unicode range node (#45)

Author: evilebottnawi

README.md

@@ -183,6 +183,16 @@ whether the first character in the argument is a quotation mark.
 ] }
 ```
 
+### unicode-range
+
+The unicode-range CSS descriptor sets the specific range of characters to be 
+used from a font defined by @font-face and made available 
+for use on the current page (`unicode-range: U+0025-00FF`).
+
+Node-specific properties:
+
+- **value**: The "unicode-range" itself.
+
 ## API
 
 ```

lib/parse.js

@@ -7,6 +7,10 @@ var slash = "/".charCodeAt(0);
 var comma = ",".charCodeAt(0);
 var colon = ":".charCodeAt(0);
 var star = "*".charCodeAt(0);
+var uLower = "u".charCodeAt(0);
+var uUpper = "U".charCodeAt(0);
+var plus = "+".charCodeAt(0);
+var isUnicodeRange = /^[a-f0-9?-]+$/i;
 
 module.exports = function(input) {
   var tokens = [];
@@ -267,6 +271,16 @@ module.exports = function(input) {
 
       if (openParentheses === code) {
         name = token;
+      } else if (
+        (uLower === token.charCodeAt(0) || uUpper === token.charCodeAt(0)) &&
+        plus === token.charCodeAt(1) &&
+        isUnicodeRange.test(token.slice(2))
+      ) {
+        tokens.push({
+          type: "unicode-range",
+          sourceIndex: pos,
+          value: token
+        });
       } else {
         tokens.push({
           type: "word",

test/parse.js

@@ -1148,6 +1148,60 @@ var tests = [
       { type: "space", sourceIndex: 10, value: " " },
       { type: "word", sourceIndex: 11, value: "-0" }
     ]
+  },
+  {
+    message: "should parse unicode-range (single codepoint)",
+    fixture: "U+26",
+    expected: [{ type: "unicode-range", sourceIndex: 0, value: "U+26" }]
+  },
+  {
+    message: "should parse unicode-range (single codepoint) 2",
+    fixture: "U+0-7F",
+    expected: [{ type: "unicode-range", sourceIndex: 0, value: "U+0-7F" }]
+  },
+  {
+    message: "should parse unicode-range (single codepoint) 3",
+    fixture: "U+0-7f",
+    expected: [{ type: "unicode-range", sourceIndex: 0, value: "U+0-7f" }]
+  },
+  {
+    message: "should parse unicode-range (single codepoint) (lowercase)",
+    fixture: "u+26",
+    expected: [{ type: "unicode-range", sourceIndex: 0, value: "u+26" }]
+  },
+  {
+    message: "should parse unicode-range (codepoint range)",
+    fixture: "U+0025-00FF",
+    expected: [{ type: "unicode-range", sourceIndex: 0, value: "U+0025-00FF" }]
+  },
+  {
+    message: "should parse unicode-range (wildcard range)",
+    fixture: "U+4??",
+    expected: [{ type: "unicode-range", sourceIndex: 0, value: "U+4??" }]
+  },
+  {
+    message: "should parse unicode-range (multiple values)",
+    fixture: "U+0025-00FF, U+4??",
+    expected: [
+      { type: "unicode-range", sourceIndex: 0, value: "U+0025-00FF" },
+      { type: "div", sourceIndex: 11, value: ",", before: "", after: " " },
+      { type: "unicode-range", sourceIndex: 13, value: "U+4??" }
+    ]
+  },
+  {
+    message: "should parse invalid unicode-range as word",
+    fixture: "U+4??Z",
+    expected: [{ type: "word", sourceIndex: 0, value: "U+4??Z" }]
+  },
+  {
+    message: "should parse invalid unicode-range as word 2",
+    fixture: "U+",
+    expected: [{ type: "word", sourceIndex: 0, value: "U+" }]
+  },
+  {
+    message: "should parse invalid unicode-range as word 2",
+    fixture: "U+Z",
+    expected: [{ type: "word", sourceIndex: 0, value: "U+Z" }]
   }
 ];
 

test/stringify.js

@@ -69,6 +69,22 @@ var tests = [
   {
     message: "Should correctly process empty url whitespace characters",
     fixture: "url(  \n \t  \n  )"
+  },
+  {
+    message: "Should correctly process unicode-range (single codepoint)",
+    fixture: "U+26"
+  },
+  {
+    message: "Should correctly process unicode-range (codepoint range)",
+    fixture: "U+0025-00FF"
+  },
+  {
+    message: "Should correctly process unicode-range (wildcard range)",
+    fixture: "U+4??"
+  },
+  {
+    message: "Should correctly process unicode-range (multiple values)",
+    fixture: "U+0025-00FF, U+4??"
   }
 ];