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-rw-r--r--src/luaotfload-auxiliary.lua76
1 files changed, 59 insertions, 17 deletions
diff --git a/src/luaotfload-auxiliary.lua b/src/luaotfload-auxiliary.lua
index 3d300e7..c927471 100644
--- a/src/luaotfload-auxiliary.lua
+++ b/src/luaotfload-auxiliary.lua
@@ -317,6 +317,12 @@ aux.name_of_slot = name_of_slot
-----------------------------------------------------------------------
--- lots of arrowcode ahead
+local get_features = function (tfmdata)
+ local resources = tfmdata.resources if not resources then return false end
+ local features = resources.features if not features then return false end
+ return features
+end
+
--[[doc--
This function, modeled after “check_script()” from fontspec, returns
true if in the given font, the script “asked_script” is accounted for in at
@@ -325,13 +331,23 @@ least one feature.
--- int -> string -> bool
local provides_script = function (font_id, asked_script)
+ if not font_id or type (font_id) ~= "number"
+ or not asked_script or type (asked_script) ~= "string"
+ then
+ logreport ("both", 0, "aux",
+ "invalid parameters to provides_language(%s, %s)",
+ tostring (font_id), tostring (asked_script))
+ return false
+ end
asked_script = stringlower(asked_script)
if font_id and font_id > 0 then
- local tfmdata = identifiers[font_id] if not tfmdata then return false end
- local shared = tfmdata.shared if not shared then return false end
- local fontdata = shared.rawdata if not fontdata then return false end
- local fontname = fontdata.metadata.fontname
- local features = fontdata.resources.features
+ local tfmdata = identifiers[font_id]
+ if not tfmdata then return false end
+ local features = get_features (tfmdata)
+ if features == false then
+ logreport ("log", 1, "aux", "font no %d lacks a features table", font_id)
+ return false
+ end
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
for feature, data in next, featuredata do
@@ -362,14 +378,27 @@ feature.
--- int -> string -> string -> bool
local provides_language = function (font_id, asked_script, asked_language)
- asked_script = stringlower(asked_script)
- asked_language = stringlower(asked_language)
+ if not font_id or type (font_id) ~= "number"
+ or not asked_script or type (asked_script) ~= "string"
+ or not asked_language or type (asked_language) ~= "string"
+ then
+ logreport ("both", 0, "aux",
+ "invalid parameters to provides_language(%s, %s, %s)",
+ tostring (font_id),
+ tostring (asked_script),
+ tostring (asked_language))
+ return false
+ end
+ asked_script = stringlower(asked_script)
+ asked_language = stringlower(asked_language)
if font_id and font_id > 0 then
- local tfmdata = identifiers[font_id] if not tfmdata then return false end
- local shared = tfmdata.shared if not shared then return false end
- local fontdata = shared.rawdata if not fontdata then return false end
- local fontname = fontdata.metadata.fontname
- local features = fontdata.resources.features
+ local tfmdata = identifiers[font_id]
+ if not tfmdata then return false end
+ local features = get_features (tfmdata)
+ if features == false then
+ logreport ("log", 1, "aux", "font no %d lacks a features table", font_id)
+ return false
+ end
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
for feature, data in next, featuredata do
@@ -432,16 +461,29 @@ accounted for in the script with tag “asked_script” in feature
--- int -> string -> string -> string -> bool
local provides_feature = function (font_id, asked_script,
asked_language, asked_feature)
+ if not font_id or type (font_id) ~= "number"
+ or not asked_script or type (asked_script) ~= "string"
+ or not asked_language or type (asked_language) ~= "string"
+ or not asked_feature or type (asked_feature) ~= "string"
+ then
+ logreport ("both", 0, "aux",
+ "invalid parameters to provides_language(%s, %s, %s, %s)",
+ tostring (font_id), tostring (asked_script),
+ tostring (asked_language), tostring (asked_feature))
+ return false
+ end
asked_script = stringlower(asked_script)
asked_language = stringlower(asked_language)
asked_feature = lpegmatch(strip_garbage, asked_feature)
if font_id and font_id > 0 then
- local tfmdata = identifiers[font_id] if not tfmdata then return false end
- local shared = tfmdata.shared if not shared then return false end
- local fontdata = shared.rawdata if not fontdata then return false end
- local features = fontdata.resources.features
- local fontname = fontdata.metadata.fontname
+ local tfmdata = identifiers[font_id]
+ if not tfmdata then return false end
+ local features = get_features (tfmdata)
+ if features == false then
+ logreport ("log", 1, "aux", "font no %d lacks a features table", font_id)
+ return false
+ end
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
local feature = featuredata[asked_feature]