Merge pull request #260 from phi-gamma/master

add import helper, new directory layout, revised letterspacing, fontloader gone nuts

1 files changed, 128 insertions, 0 deletions

diff --git a/src/fontloader/misc/fontloader-fonts-cbk.lua b/src/fontloader/misc/fontloader-fonts-cbk.lua
new file mode 100644
index 0000000..965b968
--- /dev/null
+++ b/src/fontloader/misc/fontloader-fonts-cbk.lua
@@ -0,0 +1,128 @@
+if not modules then modules = { } end modules ['luatex-fonts-cbk'] = {
+    version   = 1.001,
+    comment   = "companion to luatex-*.tex",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+if context then
+    texio.write_nl("fatal error: this module is not for context")
+    os.exit()
+end
+
+local fonts = fonts
+local nodes = nodes
+
+-- Fonts: (might move to node-gef.lua)
+
+local traverse_id = node.traverse_id
+local glyph_code  = nodes.nodecodes.glyph
+local disc_code   = nodes.nodecodes.disc
+
+-- from now on we apply ligaturing and kerning here because it might interfere with complex
+-- opentype discretionary handling where the base ligature pass expect some weird extra
+-- pointers (which then confuse the tail slider that has some checking built in)
+
+local ligaturing    = node.ligaturing
+local kerning       = node.kerning
+
+local basepass      = true
+
+function nodes.handlers.setbasepass(v)
+    basepass = v
+end
+
+function nodes.handlers.characters(head)
+    local fontdata = fonts.hashes.identifiers
+    if fontdata then
+        local usedfonts = { }
+        local basefonts = { }
+        local prevfont  = nil
+        local basefont  = nil
+        for n in traverse_id(glyph_code,head) do
+            local font = n.font
+            if font ~= prevfont then
+                if basefont then
+                    basefont[2] = n.prev
+                end
+                prevfont = font
+                local used = usedfonts[font]
+                if not used then
+                    local tfmdata = fontdata[font] --
+                    if tfmdata then
+                        local shared = tfmdata.shared -- we need to check shared, only when same features
+                        if shared then
+                            local processors = shared.processes
+                            if processors and #processors > 0 then
+                                usedfonts[font] = processors
+                            elseif basepass then
+                                basefont = { n, nil }
+                                basefonts[#basefonts+1] = basefont
+                            end
+                        end
+                    end
+                end
+            end
+        end
+        for d in traverse_id(disc_code,head) do
+            local r = d.replace
+            if r then
+                for n in traverse_id(glyph_code,r) do
+                    local font = n.font
+                    if font ~= prevfont then
+                        prevfont = font
+                        local used = usedfonts[font]
+                        if not used then
+                            local tfmdata = fontdata[font] --
+                            if tfmdata then
+                                local shared = tfmdata.shared -- we need to check shared, only when same features
+                                if shared then
+                                    local processors = shared.processes
+                                    if processors and #processors > 0 then
+                                        usedfonts[font] = processors
+                                    end
+                                end
+                            end
+                        end
+                    end
+                end
+            end
+        end
+        if next(usedfonts) then
+            for font, processors in next, usedfonts do
+                for i=1,#processors do
+                    head = processors[i](head,font,0) or head
+                end
+            end
+        end
+        if basepass and #basefonts > 0 then
+            for i=1,#basefonts do
+                local range = basefonts[i]
+                local start, stop = range[1], range[2]
+                if stop then
+                    ligaturing(start,stop)
+                    kerning(start,stop)
+                else
+                    ligaturing(start)
+                    kerning(start)
+                end
+            end
+        end
+        return head, true
+    else
+        return head, false
+    end
+end
+
+function nodes.simple_font_handler(head)
+ -- lang.hyphenate(head)
+    head = nodes.handlers.characters(head)
+    nodes.injections.handler(head)
+    if not basepass then
+        head = ligaturing(head)
+        head = kerning(head)
+    end
+    nodes.handlers.protectglyphs(head)
+    return head
+end