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49 Commits

Author SHA1 Message Date
Sascha Brawer
e99eb7948b [feaLib] Distinguish between glyphs and glyph classes in parse tree 
This will be needed for implementing class-based kerning.  According
to the OpenType Feature File specification, a different table needs to
be built for `glyph` versus `[glyph]`.
 2015-12-11 15:16:22 +01:00
Sascha Brawer
3a41bf7024 [feaLib] Make ValueRecord an Expression, not a Statement 2015-12-11 14:39:59 +01:00
Sascha Brawer
ac86de36fb [feaLib] Implement the lookupflag statement 2015-12-10 19:17:11 +01:00
Sascha Brawer
0dbb2fdcc0 [feaLib] Parse lookupflag statements 
They do not have any impact yet, this change is just for the parsing.
 2015-12-10 13:06:28 +01:00
Sascha Brawer
cb0adb98b9 [feaLib] Parse GPOS type 8: Chaining contextual positioning 
No output is generated yet, this change is just on the parser.

The OpenType Feature File specification is surprisingly vague about
the exact syntax of chaining contextual positioning rules, so I expect
that we will have to iterate on this parser. However, the test case
in parser_test.py gets recognized by `makeotf`, so the current
implementation is unlikely to be completely wrong.
 2015-12-09 23:04:36 +01:00
Sascha Brawer
c2c033d3cf [feaLib] Implement GPOS type 6: Mark-to-mark attachment positioning 2015-12-09 17:56:47 +01:00
Sascha Brawer
2af0adde6c [feaLib] Parse Mark-to-mark attachment positioning statements 
No output is produced yet; this will come in an upcoming change.
 2015-12-09 17:14:13 +01:00
Sascha Brawer
96223b8aee [feaLib] Implement GPOS type 5: Mark-to-ligature attachment positioning 2015-12-09 16:51:15 +01:00
Sascha Brawer
d622f99982 [feaLib] Clean up class names of Abstract Syntax Tree statements 
The class names of tree nodes for substitution and positioning rules
are now consistent with `builder.py`, which in turn is consistent with
`otTables.py`.
 2015-12-09 13:58:05 +01:00
Sascha Brawer
7e846691e4 [feaLib] Consistently name LookupBuilders after their OpenType subtable class 2015-12-09 12:59:20 +01:00
Sascha Brawer
0532ec85d3 [feaLib] Parse GPOS type 5: Mark-to-Ligature Attachment Positioning 
No output is produced yet, this is just the change on the parser.
 2015-12-09 10:40:49 +01:00
Sascha Brawer
790ea83a02 [feaLib] Parse GPOS type 4 aka Mark-to-Base Attachment Positioning 
However, no output tables are being built yet. This change is just
implementing the feature file parser.
 2015-12-08 19:04:42 +01:00
Sascha Brawer
dfa1551ece [feaLib] Implement markClass statement 2015-12-08 17:04:21 +01:00
Sascha Brawer
c6ee46f299 [feaLib] Implement GPOS type 3: Cursive Attachment Positioning 2015-12-07 23:56:08 +01:00
Sascha Brawer
6240593839 [feaLib] Parse anchors in format A, B, C, D, and E 2015-12-07 22:48:10 +01:00
Sascha Brawer
46983f573f [feaLib] Parse GPOS type 2 format A and B, and ValueRecord format D 
This is just the change on the parser. Building the output tables
is still marked as a TODO.
 2015-12-07 17:18:18 +01:00
Sascha Brawer
5644da31d2 [feaLib] Parse device tables 2015-12-04 17:10:20 +01:00
Sascha Brawer
46c76dbf1f [feaLib] Parse ValueRecord format C 
However, not sure how to build the otTables object graph for emitting
GPOS tables with device values; the current code thus silently strips
off any device values. Left a TODO comment for implementing this.
 2015-12-04 15:49:04 +01:00
Sascha Brawer
b99f1c9af4 [feaLib] Implement GPOS type 1, Single Adjustment Positioning 2015-12-04 12:22:01 +01:00
Sascha Brawer
cab0067c7e [feaLib] Implement GSUB LookupType 8: Reverse chaining single substitutions 2015-12-03 13:05:42 +01:00
Sascha Brawer
152dff4361 [feaLib] Implement GSUB chain substitution rules 2015-11-30 15:02:09 +01:00
Sascha Brawer
75e4053e39 [feaLib] Handle references to named lookup blocks 2015-09-28 16:49:17 +02:00
Sascha Brawer
17ab15c4af [feaLib] Implement GSUB lookup type 2 2015-09-10 15:28:02 +02:00
Sascha Brawer
a35291e8c1 [feaLib] Implement required qualifier on language statements 2015-09-08 15:55:54 +02:00
Sascha Brawer
792a958d6c [feaLib] Implement parser for multiple substitutions (GSUB LookupType 2) 
Actually building the GSUB table is not implemented yet, since this
will probably need changes to otTables.
 2015-09-08 12:05:44 +02:00
Sascha Brawer
b0bbce88b1 [feaLib] Implement Single Substitution (GSUB lookup type 1) 2015-09-08 10:33:07 +02:00
Sascha Brawer
6140a4ec2b [feaLib] Build ScriptList subtable 
Also, fixed a bug that caused language tags to be sometimes stripped.
Added an assertion to verify that language tags are always 4 chars.
 2015-09-07 21:34:10 +02:00
Sascha Brawer
80de401c09 [feaLib] Implement ligature substitutions 2015-09-07 16:10:13 +02:00
Sascha Brawer
8e8a0d68c7 [feaLib] Prohibit script and language statements within named lookups 2015-09-07 13:33:44 +02:00
Sascha Brawer
5f2e55d5fc [feaLib] Emit lookups for alternate substitutions 2015-09-07 11:39:09 +02:00
Sascha Brawer
102c0e0e56 [feaLib] Handle languagesystem, script and languaguage statements 
Currently, the compiler uses them to figure out which set of
languagesystems would apply for the current scope. However, this
information is not yet used for anything.
 2015-09-07 11:39:09 +02:00
Sascha Brawer
4f27ce3585 [feaLib] Ensure that "languagesystem DFLT dflt;" comes first 
According the to the OpenType Feature File specification,
"languagesystem DFLT dflt;" must be the first languagesystem
statement in a file.
 2015-09-07 11:39:09 +02:00
Sascha Brawer
df740092d9 [feaLib] Basic test framework for building OpenType features 2015-09-07 11:39:09 +02:00
Sascha Brawer
72c1f165b4 [feaLib] Parse substitute from statements 2015-08-11 15:54:54 +02:00
Sascha Brawer
8b77f68dec [feaLib] Parse feature blocks with useExtension keyword 2015-08-11 15:28:59 +02:00
Sascha Brawer
f60d49471d [feaLib] Parse subtable statements 2015-08-11 15:14:47 +02:00
Sascha Brawer
abb9edacc9 [feaLib] Parse anchorDef statements 2015-08-11 12:53:30 +02:00
Sascha Brawer
00714511f0 [feaLib] Parse chained contextual substitution rules 2015-08-11 12:22:07 +02:00
Sascha Brawer
c165a1e019 [feaLib] Parse lookup blocks and references 2015-08-11 10:59:26 +02:00
Sascha Brawer
6d7540ecac [feaLib] Move block parsing to a separate method 
We will soon support additional blocks beyond `feature`,
and keeping this refactoring separate from new functionality
makes it easier for code reviewers to follow the changes.
 2015-08-11 10:19:39 +02:00
Sascha Brawer
1f2fadc864 [feaLib] Parse language statements 2015-08-10 16:30:10 +02:00
Sascha Brawer
4ab6e6b169 [feaLib] Parse script statement 2015-08-10 11:30:47 +02:00
Sascha Brawer
4bcdc60ca8 [feaLib] Remove write() methods 
For now, it looks like we won't need them for anything; removing this
code makes the codebase a little bit less complicated.
 2015-08-10 11:24:24 +02:00
Sascha Brawer
bc8279bab1 [feaLib] Parse ignore sub and ignore substitute statements 2015-08-10 11:17:52 +02:00
Sascha Brawer
08d01bb24d [feaLib] Parse substitution rules for LookupTypes 1 and 3 
The parsed representation should handle most of other LookupTypes
as well, but the parser cannot recognize them yet.
 2015-08-10 11:17:52 +02:00
Sascha Brawer
c06a377aa3 [feaLib] Implement valueRecordDef statements 2015-08-10 11:17:52 +02:00
Sascha Brawer
944fab8a5f [feaLib] Implement parsing of feature blocks 2015-08-10 11:17:52 +02:00
Sascha Brawer
ba238344b1 [feaLib] Implement top-level glyph class definitions 2015-08-10 11:17:52 +02:00
Sascha Brawer
b86e30d7c6 [feaLib] Rename features.py to ast.py, for Abstract Syntax Tree 2015-08-10 11:17:52 +02:00