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-rw-r--r--src/luaotfload-features.lua114
1 files changed, 77 insertions, 37 deletions
diff --git a/src/luaotfload-features.lua b/src/luaotfload-features.lua
index fc04bce..3f9d67a 100644
--- a/src/luaotfload-features.lua
+++ b/src/luaotfload-features.lua
@@ -941,6 +941,7 @@ local report_otf = logs.reporter("fonts","otf loading")
--- start locals for addfeature()
local utfbyte = unicode.utf8.byte
+local utfchar = unicode.utf8.char
local otf = handlers and handlers.otf --- filled in later during initialization
@@ -1110,7 +1111,7 @@ local function ancient_addfeature (data, feature, specifications)
end
end
-local function addfeature(data,feature,specifications)
+local function current_addfeature(data,feature,specifications)
local descriptions = data.descriptions
local resources = data.resources
local features = resources.features
@@ -1356,8 +1357,6 @@ end
---[[ end snippet from font-otc.lua ]]
-local tlig_order = { "tlig" }
-
local tlig_specification = {
{
type = "substitution",
@@ -1368,7 +1367,7 @@ local tlig_specification = {
[0x0060] = 0x2018, -- quoteright
},
flags = noflags,
- order = tlig_order,
+ order = { "tlig" },
prepend = true,
},
{
@@ -1388,7 +1387,7 @@ local tlig_specification = {
[0x00BB] = {0x003E, 0x003E}, -- RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
},
flags = noflags,
- order = tlig_order,
+ order = { "tlig" },
prepend = true,
},
{
@@ -1401,11 +1400,24 @@ local tlig_specification = {
[0x00BF] = {0x003F, 0x0060}, -- questiondown
},
flags = noflags,
- order = tlig_order,
+ order = { "tlig" },
prepend = true,
},
}
+local tlig_specification = {
+ type = "substitution",
+ features = everywhere,
+ data = {
+ [0x0022] = 0x201D, -- quotedblright
+ [0x0027] = 0x2019, -- quoteleft
+ [0x0060] = 0x2018, -- quoteright
+ },
+ flags = noflags,
+ order = { "tlig" },
+ prepend = true,
+}
+
local anum_arabic = { --- these are the same as in font-otc
[0x0030] = 0x0660,
[0x0031] = 0x0661,
@@ -1464,9 +1476,65 @@ local anum_specification = {
},
}
+local rot13_specification = {
+ type = "substitution",
+ features = everywhere,
+ data = {
+ [65] = 78, [ 97] = 110, [78] = 65, [110] = 97,
+ [66] = 79, [ 98] = 111, [79] = 66, [111] = 98,
+ [67] = 80, [ 99] = 112, [80] = 67, [112] = 99,
+ [68] = 81, [100] = 113, [81] = 68, [113] = 100,
+ [69] = 82, [101] = 114, [82] = 69, [114] = 101,
+ [70] = 83, [102] = 115, [83] = 70, [115] = 102,
+ [71] = 84, [103] = 116, [84] = 71, [116] = 103,
+ [72] = 85, [104] = 117, [85] = 72, [117] = 104,
+ [73] = 86, [105] = 118, [86] = 73, [118] = 105,
+ [74] = 87, [106] = 119, [87] = 74, [119] = 106,
+ [75] = 88, [107] = 120, [88] = 75, [120] = 107,
+ [76] = 89, [108] = 121, [89] = 76, [121] = 108,
+ [77] = 90, [109] = 122, [90] = 77, [122] = 109,
+ },
+ flags = noflags,
+ order = { "rot13" },
+ prepend = true,
+}
+
+local extrafeatures = {
+ tlig = { tlig_specification, "tex ligatures and substitutions" },
+ anum = { anum_specification, "arabic numerals" },
+ rot13 = { rot13_specification, "rot13" },
+}
+
+function add_otf_feature (name, specification)
+ if type (name) == "table" then
+ specification = name
+ name = specification.name
+ end
+ if type (name) == "string" then
+ extrafeatures[name] = specification
+ end
+end
+
+otf.addfeature = add_otf_feature
+
+local install_extra_features = function (data, filename, raw)
+ for feature, specification in next, extrafeatures do
+ logreport ("both", 3, "features",
+ "register synthetic feature “%s” for %s font “%s”(%d)",
+ feature,
+ data.format,
+ tostring (data.metadata and data.metadata.fontname or "<unknown>"),
+ data.subfont or -1)
+ otf.features.register { name = feature, description = specification[2] }
+ otf.enhancers.addfeature (data, feature, specification[1])
+ end
+end
+
return {
init = function ()
+ logreport = luaotfload.log.report
+
if not fonts and fonts.handlers then
logreport ("log", 0, "features",
"OTF mechanisms missing -- did you forget to \z
@@ -1476,41 +1544,13 @@ return {
otf = fonts.handlers.otf
- local extrafeatures = {
- tlig = tlig_specification,
- trep = { },
- anum = anum_specification,
- }
-
--- hack for backwards compat with TL2014 loader
- local addfeature = otf.version < 2.8 and current_addfeature
- or ancient_addfeature
+ otf.enhancers.addfeature = otf.version < 2.8 and ancient_addfeature
+ or current_addfeature
otf.enhancers.register ("check extra features",
- function (data, filename, raw)
- for feature, specification in next, extrafeatures do
- logreport ("both", 3, "features",
- "register synthetic feature “%s” for %s font “%s”(%d)",
- feature,
- data.format,
- tostring (data.metadata and data.metadata.fontname or "<unknown>"),
- data.subfont or -1)
- addfeature (data, feature, specification)
- end
- end)
-
- logreport = luaotfload.log.report
- if not fonts then
- logreport ("log", 0, "features",
- "OTF mechanisms missing -- did you forget to \z
- load a font loader?")
- return false
- end
+ install_extra_features)
- otf.features.register {
- name = "anum",
- description = "arabic digits",
- }
return true
end
}