def addLookupReferences(
feature, lookups, script=None, languages=None, exclude_dflt=False
):
"""Add references to named lookups to the feature's statements.
If `script` (str) and `languages` (sequence of str) are provided,
only register the lookup for the given script and languages,
optionally with `exclude_dflt` directive.
Otherwise add a global reference which will be registered for all
the scripts and languages in the feature file's `languagesystems`
statements.
"""
assert lookups
if not script:
for lookup in lookups:
feature.statements.append(ast.LookupReferenceStatement(lookup))
return
feature.statements.append(ast.ScriptStatement(script))
if exclude_dflt:
for language in languages or ("dflt",):
feature.statements.append(
ast.LanguageStatement(language, include_default=False)
)
for lookup in lookups:
feature.statements.append(ast.LookupReferenceStatement(lookup))
else:
feature.statements.append(ast.LanguageStatement("dflt", include_default=True))
for lookup in lookups:
feature.statements.append(ast.LookupReferenceStatement(lookup))
for language in languages or ():
if language == "dflt":
continue
feature.statements.append(
ast.LanguageStatement(language, include_default=True)
)
def asFeaAST(self, allLanguages=[("DFLT", "dflt")]):
if set(allLanguages) == set(self.routine.languages):
if self.routine.usecount == 1:
return self.routine.asFeaAST(inFeature=True)
return feaast.LookupReferenceStatement(self.routine.asFeaAST())
f = feaast.Block()
lastLang = 'dflt'
for s,l in self.routine.languages:
f.statements.append(feaast.ScriptStatement(s))
if l != lastLang:
f.statements.append(feaast.LanguageStatement("%4s" % l))
lastLang = l
f.statements.append(feaast.LookupReferenceStatement(self.routine.asFeaAST()))
return f
def asFeaAST(self, expand=False):
if expand or not self.routine.languages:
if self.routine.usecount == 1:
return self.routine.asFeaAST(inFeature=True)
return feaast.LookupReferenceStatement(self.routine.asFeaAST())
f = feaast.Block()
lastLang = 'dflt'
for s, l in self.routine.languages:
f.statements.append(feaast.ScriptStatement(s))
if l != lastLang:
f.statements.append(feaast.LanguageStatement("%4s" % l))
lastLang = l
f.statements.append(
feaast.LookupReferenceStatement(self.routine.asFeaAST()))
return f
def parse_lookup_(self, vertical):
assert self.is_cur_keyword_("lookup")
location, name = self.cur_token_location_, self.expect_name_()
if self.next_token_ == ";":
lookup = self.lookups_.resolve(name)
if lookup is None:
raise FeatureLibError("Unknown lookup \"%s\"" % name,
self.cur_token_location_)
self.expect_symbol_(";")
return ast.LookupReferenceStatement(location, lookup)
use_extension = False
if self.next_token_ == "useExtension":
self.expect_keyword_("useExtension")
use_extension = True
block = ast.LookupBlock(location, name, use_extension)
self.parse_block_(block, vertical)
self.lookups_.define(name, block)
return block
def asFeaAST(self, expand=False):
# if self.routine.usecount == 1:
# return self.routine.asFeaAST()
f = feaast.Block()
f.statements.append(feaast.LookupReferenceStatement(self.routine.asFeaAST()))
return f
def _buildFeatureFile(self, tables):
doc = ast.FeatureFile()
statements = doc.statements
if self._glyphclasses:
statements.append(ast.Comment("# Glyph classes"))
statements.extend(self._glyphclasses.values())
if self._markclasses:
statements.append(ast.Comment("\n# Mark classes"))
statements.extend(c[1] for c in sorted(self._markclasses.items()))
if self._lookups:
statements.append(ast.Comment("\n# Lookups"))
for lookup in self._lookups.values():
statements.extend(getattr(lookup, "targets", []))
statements.append(lookup)
# Prune features
features = self._features.copy()
for ftag in features:
scripts = features[ftag]
for stag in scripts:
langs = scripts[stag]
for ltag in langs:
langs[ltag] = [
l for l in langs[ltag] if l.lower() in self._lookups
]
scripts[stag] = {t: l for t, l in langs.items() if l}
features[ftag] = {t: s for t, s in scripts.items() if s}
features = {t: f for t, f in features.items() if f}
if features:
statements.append(ast.Comment("# Features"))
for ftag, scripts in features.items():
feature = ast.FeatureBlock(ftag)
stags = sorted(scripts, key=lambda k: 0 if k == "DFLT" else 1)
for stag in stags:
feature.statements.append(ast.ScriptStatement(stag))
ltags = sorted(scripts[stag],
key=lambda k: 0 if k == "dflt" else 1)
for ltag in ltags:
include_default = True if ltag == "dflt" else False
feature.statements.append(
ast.LanguageStatement(
ltag, include_default=include_default))
for name in scripts[stag][ltag]:
lookup = self._lookups[name.lower()]
lookupref = ast.LookupReferenceStatement(lookup)
feature.statements.append(lookupref)
statements.append(feature)
if self._gdef and "GDEF" in tables:
classes = []
for name in ("BASE", "MARK", "LIGATURE", "COMPONENT"):
if name in self._gdef:
classname = "GDEF_" + name.lower()
glyphclass = ast.GlyphClassDefinition(
classname, self._gdef[name])
statements.append(glyphclass)
classes.append(ast.GlyphClassName(glyphclass))
else:
classes.append(None)
gdef = ast.TableBlock("GDEF")
gdef.statements.append(ast.GlyphClassDefStatement(*classes))
statements.append(gdef)
return doc
