* Add ligation group brack-bar and brace-bar, and enabled in dlig (#767).

README.md

@@ -406,6 +406,8 @@ Subsection `ligations` is used to customize the ligation set assigned to `calt`
   - `gteq-as-co-arrow`: Treat `>=` as co-arrow.
   - `html-comment`: Enable ligation for `<!--` and `<!---`.
   - `colon-greater-as-colon-arrow`: Transform `:>` into `:` and a narrow arrow..
+  - `brace-bar`: Enable ligation for `{|` and `|}`.
+  - `brack-bar`: Enable ligation for `[|` and `|]`.
 
 <!-- END Section-Cherry-Picking-Ligation-Sets -->
 

changes/4.1.0.md

@@ -1,2 +1,3 @@
- * Add characters
+ * Add ligation group `brack-bar` and `brace-bar`, and enabled in `dlig` (#767).
+ * Add characters:
    - Telephone Sign (`U+2121`) and Facsimile Sign (`U+213B`).

font-src/glyphs/symbol/punctuation.ptl

@@ -98,16 +98,17 @@ glyph-block Symbol-Punctuation-Brackets : begin
 
 	define [BracketMask] : Rect MosaicTop MosaicBottom (-Width) (2 * Width)
 
-	define [BracketShape top bottom] : glyph-proc
-		local l : mix SB RightSB DesignParameters.bracketOutside
-		local r : mix SB RightSB DesignParameters.bracketInside
+	define [BracketShape top bottom barLeft ext] : glyph-proc
+		local l : fallback barLeft : mix SB RightSB DesignParameters.bracketOutside
+		local r : [fallback ext 0] + [mix SB RightSB DesignParameters.bracketInside]
 
 		include : HBarBottom l r bottom
 		include : HBarTop    l r top
 		include : VBarLeft   l bottom top
 
-	create-glyph 'bracketLeft' '[' : glyph-proc
-		include : BracketShape ParenTop ParenBot
+	create-glyph 'bracketLeft' '[' : BracketShape ParenTop ParenBot
+
+	create-glyph 'ligExtBracketLeft' : BracketShape ParenTop ParenBot (Middle - HalfStroke * HVContrast) [mix SB RightSB DesignParameters.bracketInside]
 
 	create-glyph 'bracketLeftUpper' 0x23A1 : glyph-proc
 		include : intersection [BracketMask]
@@ -143,6 +144,7 @@ glyph-block Symbol-Punctuation-Brackets : begin
 			VBarLeft   l ParenBot ParenTop
 
 	turned 'bracketRight' ']' 'bracketLeft' Middle SymbolMid
+	turned 'ligExtBracketRight' null 'ligExtBracketLeft' Middle SymbolMid
 	turned 'bracketRightLower' 0x23A6 'bracketLeftUpper' Middle SymbolMid
 	turned 'bracketRightExtension' 0x23A5 'bracketLeftExtension' Middle SymbolMid
 	turned 'bracketRightUpper' 0x23A4 'bracketLeftLower' Middle SymbolMid
@@ -156,31 +158,37 @@ glyph-block Symbol-Punctuation-Brackets : begin
 			(ParenTop - SymbolMid - Stroke * 1.5) / 2
 		return : object parenCenter radius
 
-	define [BraceUpperHalfShape top bottom] : glyph-proc
+	define [BraceUpperHalfShape top bottom pExt] : glyph-proc
 		define [object parenCenter radius] : BraceDim
+		define xIns : mix SB RightSB DesignParameters.braceInside
+		define xTip : mix SB RightSB DesignParameters.braceOutside
 		include : dispiro
-			straight.left.start [mix SB RightSB DesignParameters.braceInside] top [widths.heading HalfStroke HalfStroke Leftward]
+			flat ((1 + [fallback pExt 0]) * xIns) top [widths.center.heading Stroke Leftward]
+			curl (xIns - 0.1) top [heading Leftward]
 			archv
 			flat parenCenter (top - radius) [heading Downward]
 			curl parenCenter (bottom + radius) [heading Downward]
 			arcvh
-			straight.left.end [mix SB RightSB DesignParameters.braceOutside] bottom [heading Leftward]
+			straight.left.end xTip bottom [heading Leftward]
+
+	define [BraceLowerHalfShape top bottom pExt] : glyph-proc
+		define [object parenCenter radius] : BraceDim
+		define xIns : mix SB RightSB DesignParameters.braceInside
+		define xTip : mix SB RightSB DesignParameters.braceOutside
+		include : dispiro
+			flat ((1 + [fallback pExt 0]) * xIns) bottom [widths.center.heading Stroke Leftward]
+			curl (xIns - 0.1) bottom [heading Leftward]
+			archv
+			flat parenCenter (bottom + radius) [heading Upward]
+			curl parenCenter (top - radius) [heading Upward]
+			arcvh
+			straight.left.end xTip top [heading Leftward]
 
 	define [BraceUpperThirdShape top bottom] : glyph-proc
 		define [object parenCenter radius] : BraceDim
 		include : intersection [BracketMask]
 			BraceUpperHalfShape top (bottom - MosaicHeight)
 
-	define [BraceLowerHalfShape top bottom] : glyph-proc
-		define [object parenCenter radius] : BraceDim
-		include : dispiro
-			straight.left.start [mix SB RightSB DesignParameters.braceInside] bottom [widths.heading HalfStroke HalfStroke Leftward]
-			archv
-			flat parenCenter (bottom + radius) [heading Upward]
-			curl parenCenter (top - radius) [heading Upward]
-			arcvh
-			straight.left.end [mix SB RightSB DesignParameters.braceOutside] top [heading Leftward]
-
 	define [BraceLowerThirdShape top bottom] : glyph-proc
 		define [object parenCenter radius] : BraceDim
 		include : intersection [BracketMask]
@@ -207,6 +215,10 @@ glyph-block Symbol-Punctuation-Brackets : begin
 			include : BraceUpperHalfShape top SymbolMid
 			include : BraceLowerHalfShape SymbolMid bot
 
+		create-glyph 'ligExtBraceLeft.straight' : glyph-proc
+			include : BraceUpperHalfShape top SymbolMid 1
+			include : BraceLowerHalfShape SymbolMid bot 1
+
 		create-glyph 'braceLeftUpper' 0x23A7 : glyph-proc
 			include : BraceUpperThirdShape top bot
 
@@ -220,11 +232,12 @@ glyph-block Symbol-Punctuation-Brackets : begin
 			include : BraceExtensionShape top bot
 
 	turned 'braceRight.straight' null 'braceLeft.straight' Middle SymbolMid
+	turned 'ligExtBraceRight.straight' null 'ligExtBraceLeft.straight' Middle SymbolMid
 	turned 'braceRightLower' 0x23AD 'braceLeftUpper' Middle SymbolMid
 	turned 'braceRightUpper' 0x23AB 'braceLeftLower' Middle SymbolMid
 	turned 'braceRightMiddle' 0x23AC 'braceLeftMiddle' Middle SymbolMid
 
-	define [CurlyBraceShape sw] : glyph-proc
+	define [CurlyBraceShape sw pExt] : glyph-proc
 		local hs : sw / 2
 		local xIns : mix SB RightSB DesignParameters.braceInside
 		local xOus : mix SB RightSB DesignParameters.braceOutside
@@ -237,30 +250,37 @@ glyph-block Symbol-Punctuation-Brackets : begin
 		local top : mix SymbolMid ParenTop (1 + DesignParameters.braceOvershoot)
 		local bot : mix SymbolMid ParenBot (1 + DesignParameters.braceOvershoot)
 		include : dispiro
-			straight.left.start xIns (top - hs) [widths.heading hs hs Leftward]
+			flat (xIns * (1 + pExt)) (top - hs) [widths.center.heading sw Leftward]
+			curl (xIns - 0.1) (top - hs) [heading Leftward]
 			archv
 			g4.down.mid m1 (top - radius1) [heading Downward]
 			alsoThru 0.5 0.5 [widths (ess / 2) (ess / 2)]
-			g4.down.mid m2 (SymbolMid + radius2) [widths.heading hs hs Downward]
+			g4.down.mid m2 (SymbolMid + radius2) [widths.center.heading sw Downward]
 			arcvh
 			straight.left.end xOus SymbolMid [heading Leftward]
 
 		include : dispiro
-			straight.left.start xIns (bot + hs) [widths.heading hs hs Leftward]
+			flat (xIns * (1 + pExt)) (bot + hs) [widths.center.heading sw Leftward]
+			curl (xIns - 0.1) (bot + hs) [heading Leftward]
 			archv
 			g4.up.mid m1 (bot + radius1) [heading Upward]
 			alsoThru 0.5 0.5 [widths (ess / 2) (ess / 2)]
-			g4.up.mid m2 (SymbolMid - radius2) [widths.heading hs hs Upward]
+			g4.up.mid m2 (SymbolMid - radius2) [widths.center.heading sw Upward]
 			arcvh
 			straight.left.end xOus SymbolMid [heading Leftward]
 
-	create-glyph 'braceLeft.curly' : CurlyBraceShape Stroke
+	create-glyph 'braceLeft.curly' : CurlyBraceShape Stroke 0
+	create-glyph 'ligExtBraceLeft.curly' : CurlyBraceShape Stroke 1
 
 	turned 'braceRight.curly' null 'braceLeft.curly' Middle SymbolMid
+	turned 'ligExtBraceRight.curly' null 'ligExtBraceLeft.curly' Middle SymbolMid
 
 	select-variant 'braceLeft' '{'
 	select-variant 'braceRight' '}'
 
+	select-variant 'ligExtBraceLeft' (follow -- 'braceLeft')
+	select-variant 'ligExtBraceRight' (follow -- 'braceRight')
+
 	do
 		local top : mix SymbolMid ParenTop (1 + DesignParameters.braceOvershoot)
 		local bot : mix SymbolMid ParenBot (1 + DesignParameters.braceOvershoot)
@@ -274,7 +294,7 @@ glyph-block Symbol-Punctuation-Brackets : begin
 		local xIns : mix SB RightSB DesignParameters.braceInside
 		local top : mix SymbolMid ParenTop (1 + DesignParameters.braceOvershoot)
 		local bot : mix SymbolMid ParenBot (1 + DesignParameters.braceOvershoot)
-		include : CurlyBraceShape fine
+		include : CurlyBraceShape fine 0
 		include : VBarRight xIns (bot + fine / 2) (top - fine / 2) fine
 
 	turned 'whiteBraceRight' 0x2984 'whiteBraceLeft' Middle SymbolMid
@@ -439,16 +459,24 @@ glyph-block Symbol-Punctuation-Bar : begin
 	glyph-block-import CommonShapes
 	glyph-block-import Common-Derivatives
 
-	define [BarShape] : glyph-proc
-		set-base-anchor 'above' Middle ParenTop
-		set-base-anchor 'below' Middle ParenBot
-		include : VBar Middle ParenBot ParenTop
+	define [BarShape x gap] : glyph-proc
+		set-base-anchor 'above' x ParenTop
+		set-base-anchor 'below' x ParenBot
+		include : VBar x (ParenBot + gap) (ParenTop - gap)
 
-	create-glyph 'bar.upright' : BarShape
-	create-glyph 'bar.italic.naturalSlope' : BarShape
+	create-glyph 'bar.upright' : BarShape Middle 0
+	create-glyph 'bar.italic.naturalSlope' : BarShape Middle 0
 	create-glyph 'bar.italic.forceUpright' : glyph-proc
 		include : ForceUpright
-		include : BarShape
+		include : BarShape Middle 0
+
+	create-glyph 'ligBarInsideBracketLeft' : BarShape
+		[mix SB RightSB DesignParameters.bracketOutside] + HalfStroke * HVContrast
+		Stroke + [Math.max [AdviceStroke 5] (XH / 12)]
+
+	create-glyph 'ligBarInsideBracketRight' : BarShape
+		[mix RightSB SB DesignParameters.bracketOutside] - HalfStroke * HVContrast
+		Stroke + [Math.max [AdviceStroke 5] (XH / 12)]
 
 	define [DoubleBarShape] : glyph-proc
 		set-base-anchor 'above' Middle ParenTop

font-src/otl/gsub-ligation.ptl

@@ -903,3 +903,20 @@ define [buildLigationsImpl sink para featureName mappedFeature rankedLookups] :
 		chain-rule
 			{'colon.mid'} ~> look-around
 			{'greater'}   ~> {'greaterArrow'}
+
+	# [| |] {| |}
+	do "brack-brace-bar" : begin
+		CreateLigationLookup : keep-if 'brack-bar' : list
+			chain-rule
+				{'bracketLeft'}  ~> {'ligExtBracketLeft'}
+				{'bar'}          ~> {'ligBarInsideBracketLeft'}
+			chain-rule
+				{'bar'}          ~> {'ligBarInsideBracketRight'}
+				{'bracketRight'} ~> {'ligExtBracketRight'}
+		CreateLigationLookup : keep-if 'brace-bar' : list
+			chain-rule
+				{'braceLeft'}    ~> {'ligExtBraceLeft'}
+				{'bar'}          ~> {'ligBarInsideBracketLeft'}
+			chain-rule
+				{'bar'}          ~> {'ligBarInsideBracketRight'}
+				{'braceRight'}   ~> {'ligExtBraceRight'}