Support ligatures

lib/fontcustom.rb

@@ -37,6 +37,7 @@ def gem_lib
     :autowidth => false,
     :no_hash => false,
     :css3 => false,
+    :ligature => false,
     :debug => false,
     :force => false,
     :quiet => false,

lib/fontcustom/generator/font.rb

@@ -68,6 +68,10 @@ def set_glyph_info
             data[:codepoint] = codepoint
             codepoint = codepoint + 1
           end
+
+          if @options[:ligature]
+            data[:ligature] = name.to_s.gsub(/[^a-zA-Z0-9]+/, '')
+          end
         end
         @manifest.set :glyphs, glyphs
       end

lib/fontcustom/generator/template.rb

@@ -197,7 +197,7 @@ def glyph_selectors
       end
 
       def glyph_properties
-%Q|  display: inline-block;
+        properties = %Q|  display: inline-block;
   font-family: "#{font_name}";
   font-style: normal;
   font-weight: normal;
@@ -209,11 +209,22 @@ def glyph_properties
   -moz-osx-font-smoothing: grayscale;
   -webkit-font-smoothing: antialiased;
   font-smoothing: antialiased;|
+        if @options[:ligature]
+          properties += %Q|
+  -webkit-text-rendering: optimizeLegibility;
+  -moz-text-rendering: optimizeLegibility;
+  -ms-text-rendering: optimizeLegibility;
+  -o-text-rendering: optimizeLegibility;
+  text-rendering: optimizeLegibility;|
+        end
+
+        properties
       end
 
       def glyphs
         output = @glyphs.map do |name, value|
-          %Q|#{@options[:css_selector].sub('{{glyph}}', name.to_s)}#{@pseudo_element} { content: "\\#{value[:codepoint].to_s(16)}"; }|
+          content = @options[:ligature] ? name.to_s : "\\#{value[:codepoint].to_s(16)}"
+          %Q|#{@options[:css_selector].sub('{{glyph}}', name.to_s)}#{@pseudo_element} { content: "\\#{content}"; }|
         end
         output.join "\n"
       end

lib/fontcustom/scripts/generate.py

@@ -47,6 +47,30 @@
 # Glyphs
 #
 
+def resolveGlyphName( c ):
+    if c == "0":
+        c = "zero"
+    elif c == "1":
+        c = "one"
+    elif c == "2":
+        c = "two"
+    elif c == "3":
+        c = "three"
+    elif c == "4":
+        c = "four"
+    elif c == "5":
+        c = "five"
+    elif c == "6":
+        c = "six"
+    elif c == "7":
+        c = "seven"
+    elif c == "8":
+        c = "eight"
+    elif c == "9":
+        c = "nine"
+
+    return c;
+
 def removeSwitchFromSvg( file ):
     svgfile = open(file, 'r')
     svgtext = svgfile.read()
@@ -59,46 +83,79 @@ def removeSwitchFromSvg( file ):
 
     return tmpsvgfile.name
 
-def createGlyph( name, source, code ):
+def setGlyphWidth( glyph ):
+    if options['autowidth']:
+        glyph.left_side_bearing = glyph.right_side_bearing = 0
+        glyph.round()
+    else:
+        glyph.width = options['font_em']
+        width = glyph.width - glyph.left_side_bearing - glyph.right_side_bearing
+        aligned_to_pixel_grid = (width % design_px == 0)
+        if (aligned_to_pixel_grid):
+            shift = glyph.left_side_bearing % design_px
+            glyph.left_side_bearing = glyph.left_side_bearing - shift
+            glyph.right_side_bearing = glyph.right_side_bearing + shift
+
+def createEmptyGlyph(code):
+    glyph = font.createChar(ord(code), resolveGlyphName(code))
+    pen = glyph.glyphPen()
+    pen.moveTo(0, 0)
+    pen = None
+
+def createGlyph( name, source, code, data ):
     frag, ext = os.path.splitext(source)
 
     if ext == '.svg':
         temp = removeSwitchFromSvg(source)
-        glyph = font.createChar(code, name)
+        if options['ligature']:
+            glyph = font.createChar(code, str(name))
+        else:
+            glyph = font.createChar(code)
         glyph.importOutlines(temp)
         os.unlink(temp)
 
-        if options['autowidth']:
-            glyph.left_side_bearing = glyph.right_side_bearing = 0
-            glyph.round()
-        else:
-            glyph.width = options['font_em']
-            width = glyph.width - glyph.left_side_bearing - glyph.right_side_bearing
-            aligned_to_pixel_grid = (width % design_px == 0)
-            if (aligned_to_pixel_grid):
-                shift = glyph.left_side_bearing % design_px
-                glyph.left_side_bearing = glyph.left_side_bearing - shift
-                glyph.right_side_bearing = glyph.right_side_bearing + shift
+        setGlyphWidth(glyph)
+
+        if options['ligature']:
+            liganame = str(data['ligature'])
+            chars = []
+            for char in liganame:
+                createEmptyGlyph(char)
+                charName = resolveGlyphName(char)
+                chars.append(charName)
+            liga = tuple(chars)
+            print liga
+            glyph.addPosSub('liga', liga)
 
 # Add valid space glyph to avoid "unknown character" box on IE11
 glyph = font.createChar(32)
 glyph.width = 200
 
+if options['ligature']:
+    font.addLookup('liga', 'gsub_ligature', (), (('liga', (('latn', ('dflt')), )), ))
+    font.addLookupSubtable('liga', 'liga')
+
 for glyph, data in manifest['glyphs'].items():
     name = createGlyph(glyph, data['source'], data['codepoint'])
 
 #
 # Generate Files
 #
 
+def generateFont( filename ):
+    if options['ligature']:
+        font.generate(filename, flags=('opentype'))
+    else:
+        font.generate(filename)
+
 try:
     fontfile = options['output']['fonts'] + '/' + options['font_name']
     if not options['no_hash']:
         fontfile += '_' + manifest['checksum']['current'][:32]
 
     # Generate TTF and SVG
-    font.generate(fontfile + '.ttf')
-    font.generate(fontfile + '.svg')
+    generateFont(fontfile + '.ttf')
+    generateFont(fontfile + '.svg')
     manifest['fonts'].append(fontfile + '.ttf')
     manifest['fonts'].append(fontfile + '.svg')
 

lib/fontcustom/templates/fontcustom-preview.html

@@ -109,7 +109,7 @@
         text-align: center;
       }
 
-      .usage .point { width: 150px; }
+      .usage .point, .usage .liagture { width: 150px; }
 
       .usage .class { width: 250px; }
 
@@ -162,6 +162,9 @@ <h1><%= font_name %> contains <%= @glyphs.length %> glyphs:</h1>
         <div class="usage">
           <input class="class" type="text" readonly="readonly" onClick="this.select();" value="<%= selector %>" />
           <input class="point" type="text" readonly="readonly" onClick="this.select();" value="&amp;#x<%= value[:codepoint].to_s(16) %>;" />
+          <% if @options[:ligature] %>
+          <input class="ligature" type="text" readonly="readonly" onClick="this.select();" value="<%= value[:ligature].to_s %>" />
+          <% end %>
         </div>
       </div>
       <% end %>

lib/fontcustom/templates/fontcustom.yml

@@ -97,3 +97,6 @@
 
 # Horizontally fit glyphs to their individual vector widths.
 #autowidth: false
+
+# Activate ligature mode.
+#ligature: false

spec/fontcustom/generator/template_spec.rb

@@ -6,7 +6,7 @@
       live_test do |testdir|
         FileUtils.cp_r fixture("generators/mixed-output"), "fontcustom"
         test_manifest(
-          :input => "vectors", 
+          :input => "vectors",
           :quiet => true,
           :templates => %w|preview css scss scss-rails|
         )
@@ -85,9 +85,9 @@
       gen.send :create_files
     end
   end
-  
+
   context ".font_face" do
-    it "should return base64 when options are set" do 
+    it "should return base64 when options are set" do
       gen = Fontcustom::Generator::Template.new fixture("generators/.fontcustom-manifest.json")
       allow(gen).to receive(:woff_base64).and_return("3xampled4ta")
       options = gen.instance_variable_get :@options
@@ -97,6 +97,16 @@
     end
   end
 
+  context ".glyph_properties" do
+    it "should contain optimizeLegibility when options are set" do
+      gen = Fontcustom::Generator::Template.new fixture("generators/.fontcustom-manifest.json")
+      options = gen.instance_variable_get :@options
+      options[:ligature] = true
+
+      expect(gen.send(:glyph_properties)).to match("optimizeLegibility")
+    end
+  end
+
   context ".get_target_path" do
     it "should generate the correct preview target when using default font_name" do
       gen = Fontcustom::Generator::Template.new fixture("generators/.fontcustom-manifest.json")