Provided SassScript version of some Compass Ruby functions.

README.markdown

@@ -1,6 +1,12 @@
 # Compass SASS Stylesheets
 This is a repository to pull SASS style sheets on bower, and enjoy the compass mixins by using libsass for faster compilation. I made no modifications to the original stylesheets from the [original repository](https://github.com/chriseppstein/compass.git)
 
+# Compass Ruby Functions
+
+This project includes reasonably similar implementations of some of the Ruby functions that Compass provides as Sass extensions. These are used in some Compass mixins, such as `@include background()`.
+
+To make those functions available to your compass mixins, you'll want to import the included `_functions.scss` before `_compass.scss`.
+
 ## License
 Copyright (c) 2008-2009 Christopher M. Eppstein<br>
 All Rights Reserved.<br>

lib/_functions.scss

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+@import "functions/lists";

lib/functions/lists.scss

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+/*
+ * A partial implementation of the Ruby list functions from Compass:
+ * https://github.com/Compass/compass/blob/stable/lib/compass/sass_extensions/functions/lists.rb
+ */
+
+
+// compact is part of libsass
+
+@function -compass-nth($list, $place) {
+  // Yep, Sass-lists are 1-indexed.
+  @if $place == "first" {
+    $place: 1;
+  }
+  @if $place == "last" {
+    $place: length($list);
+  }
+  @return nth($list, $place);
+}
+
+// compass_list and compass_space_list can't be implemented in sass script
+
+@function -compass-list-size($list) {
+  @return length($list);
+}
+
+@function -compass-slice($list, $start, $end: false) {
+  @if $end == false {
+    $end: length($list);
+  }
+  $full: nth($list, $start);
+  @for $i from $start + 1 through $end {
+    $full: $full, nth($list, $i);
+  }
+  @return $full;
+}
+
+@function reject($list, $reject1, $reject2:null, $reject3:null, $reject4:null, $reject5:null, $reject6:null, $reject7:null, $reject8:null, $reject9:null) {
+  $rejects: $reject1, $reject2, $reject3, $reject4, $reject5, $reject6, $reject7, $reject8, $reject9;
+
+  $full: false;
+  @each $item in $list {
+    @if index($rejects, $item) {}
+    @else {
+      @if $full {
+        $full: $full, $item;
+      }
+      @else {
+        $full: $item;
+      }
+    }
+  }
+  @return $full;
+}

test/functionsSpec.js

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+var sass = require('node-sass');
+var chalk = require('chalk');
+
+var libDir = __dirname.replace(/test$/, 'lib');
+
+var render = function(data, callback) {
+  sass.render({
+    data: '@import "'+libDir+'/functions";' + data,
+    outputStyle: 'compressed',
+    success: function(output){
+      callback(output);
+    },
+    error: function(err){
+      console.log(chalk.red("Sass error:"), err);
+      callback('', err);
+    }
+  });
+}
+
+var property = function(prop) {
+  return 'a{b:'+prop+';}';
+}
+
+describe("Functions", function () {
+
+  // This is verifying a function that's part of libsass that Compass also provided.
+  it("should compact a list with false values", function (done) {
+    render(property('compact(one,false,three)'), function(output, err) {
+      expect(output).toBe(property('one,three'));
+      done();
+    });
+  });
+
+  it("should calculate a list length", function(done) {
+    render('$list: one, two;' + property('-compass-list-size($list)'), function(output, err) {
+      expect(output).toBe(property('2'));
+      done();
+    });
+  });
+
+  it("should calculate a list length with a space delimiter", function(done) {
+    render('$list: one two;' + property('-compass-list-size($list)'), function(output, err) {
+      expect(output).toBe(property('2'));
+      done();
+    });
+  });
+
+  it("should slice a list", function(done) {
+    render('$list: one, two, three, four;' + property('-compass-slice($list, 2, 3)'), function(output, err) {
+      expect(output).toBe(property('two,three'));
+      done();
+    });
+  });
+
+  it("should slice a list to the end", function(done) {
+    render('$list: one, two, three, four;' + property('-compass-slice($list, 2)'), function(output, err) {
+      expect(output).toBe(property('two,three,four'));
+      done();
+    });
+  });
+
+  it("should reject values from a list", function(done) {
+    render('$list: one, two, three, four;' + property('reject($list, two, four)'), function(output, err) {
+      expect(output).toBe(property('one,three'));
+      done();
+    });
+  });
+
+});