adding a first working version of luaotfload

1 files changed, 127 insertions, 0 deletions

diff --git a/otfl-font-otc.lua b/otfl-font-otc.lua
new file mode 100644
index 0000000..840d4a9
--- /dev/null
+++ b/otfl-font-otc.lua
@@ -0,0 +1,127 @@
+if not modules then modules = { } end modules ['font-otc'] = {
+    version   = 1.001,
+    comment   = "companion to font-otf.lua (context)",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local format, insert = string.format, table.insert
+local type, next = type, next
+
+-- we assume that the other otf stuff is loaded already
+
+local trace_loading = false  trackers.register("otf.loading", function(v) trace_loading = v end)
+
+local otf = fonts.otf
+local tfm = fonts.tfm
+
+-- for good old times (usage is to be avoided)
+
+local tlig_list = {
+    endash        = "hyphen hyphen",
+    emdash        = "hyphen hyphen hyphen",
+--~ quotedblleft  = "quoteleft quoteleft",
+--~ quotedblright = "quoteright quoteright",
+--~ quotedblleft  = "grave grave",
+--~ quotedblright = "quotesingle quotesingle",
+--~ quotedblbase  = "comma comma",
+}
+local trep_list = {
+--~ [0x0022] = 0x201D,
+    [0x0027] = 0x2019,
+--~ [0x0060] = 0x2018,
+}
+
+-- instead of "script = "DFLT", langs = { 'dflt' }" we now use wildcards (we used to
+-- have always); some day we can write a "force always when true" trick for other
+-- features as well
+
+local tlig_feature = {
+    features  = { { scripts = { { script = "*", langs = { "*" }, } }, tag = "tlig", comment = "added bij mkiv" }, },
+    name      = "ctx_tlig",
+    subtables = { { name = "ctx_tlig_1" } },
+    type      = "gsub_ligature",
+    flags     = { },
+}
+local trep_feature = {
+    features  = { { scripts = { { script = "*", langs = { "*" }, } }, tag = "trep", comment = "added bij mkiv" }, },
+    name      = "ctx_trep",
+    subtables = { { name = "ctx_trep_1" } },
+    type      = "gsub_single",
+    flags     = { },
+}
+
+fonts.otf.enhancers["enrich with features"] = function(data,filename)
+    local glyphs = data.glyphs
+    local indices = data.map.map
+    for unicode, index in next, indices do
+        local glyph = glyphs[index]
+        local l = tlig_list[glyph.name]
+        if l then
+            local o = glyph.lookups or { }
+            o["ctx_tlig_1"] = { { "ligature", l, glyph.name } }
+            glyph.lookups = o
+        end
+        local r = trep_list[unicode]
+        if r then
+            local replacement = indices[r]
+            if replacement then
+                local o = glyph.lookups or { }
+                o["ctx_trep_1"] = { { "substitution", glyphs[replacement].name } } ---
+                glyph.lookups = o
+            end
+        end
+    end
+    data.gsub = data.gsub or { }
+    if trace_loading then
+        logs.report("load otf","enhance: registering tlig feature")
+    end
+    insert(data.gsub,1,table.fastcopy(tlig_feature))
+    if trace_loading then
+        logs.report("load otf","enhance: registering trep feature")
+    end
+    insert(data.gsub,1,table.fastcopy(trep_feature))
+end
+
+otf.tables.features['tlig'] = 'TeX Ligatures'
+otf.tables.features['trep'] = 'TeX Replacements'
+
+otf.features.register_base_substitution('tlig')
+otf.features.register_base_substitution('trep')
+
+-- the functionality is defined elsewhere
+
+fonts.initializers.base.otf.equaldigits = fonts.initializers.common.equaldigits
+fonts.initializers.node.otf.equaldigits = fonts.initializers.common.equaldigits
+
+fonts.initializers.base.otf.lineheight  = fonts.initializers.common.lineheight
+fonts.initializers.node.otf.lineheight  = fonts.initializers.common.lineheight
+
+fonts.initializers.base.otf.compose     = fonts.initializers.common.compose
+fonts.initializers.node.otf.compose     = fonts.initializers.common.compose
+
+-- bonus function
+
+function otf.name_to_slot(name) -- todo: afm en tfm
+    local tfmdata = fonts.ids[font.current()]
+    if tfmdata and tfmdata.shared then
+        local otfdata = tfmdata.shared.otfdata
+        local unicode = otfdata.luatex.unicodes[name]
+        if type(unicode) == "number" then
+            return unicode
+        else
+            return unicode[1]
+        end
+    end
+    return nil
+end
+
+function otf.char(n) -- todo: afm en tfm
+    if type(n) == "string" then
+        n = otf.name_to_slot(n)
+    end
+    if n then
+        tex.sprint(tex.ctxcatcodes,format("\\char%s ",n))
+    end
+end