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import re
featureRE = re.compile(
"^" # start of line
"\s*" #
"feature" # feature
"\s+" #
"(\w{4})" # four alphanumeric characters
"\s*" #
"\{" # {
, re.MULTILINE # run in multiline to preserve line seps
)
def splitFeaturesForFontLab(text):
"""
>>> result = splitFeaturesForFontLab(testText)
>>> result == expectedTestResult
True
"""
classes = ""
features = []
while text:
m = featureRE.search(text)
if m is None:
classes = text
text = ""
else:
start, end = m.span()
# if start is not zero, this is the first match
# and all previous lines are part of the "classes"
if start > 0:
assert not classes
classes = text[:start]
# extract the current feature
featureName = m.group(1)
featureText = text[start:end]
text = text[end:]
# grab all text before the next feature definition
# and add it to the current definition
if text:
m = featureRE.search(text)
if m is not None:
start, end = m.span()
featureText += text[:start]
text = text[start:]
else:
featureText += text
text = ""
# store the feature
features.append((featureName, featureText))
return classes, features
testText = """
@class1 = [a b c d];
feature liga {
sub f i by fi;
} liga;
@class2 = [x y z];
feature salt {
sub a by a.alt;
} salt; feature ss01 {sub x by x.alt} ss01;
feature ss02 {sub y by y.alt} ss02;
# feature calt {
# sub a b' by b.alt;
# } calt;
"""
expectedTestResult = (
"\n@class1 = [a b c d];\n",
[
("liga", "\nfeature liga {\n sub f i by fi;\n} liga;\n\n@class2 = [x y z];\n"),
("salt", "\nfeature salt {\n sub a by a.alt;\n} salt; feature ss01 {sub x by x.alt} ss01;\n"),
("ss02", "\nfeature ss02 {sub y by y.alt} ss02;\n\n# feature calt {\n# sub a b' by b.alt;\n# } calt;\n")
]
)
if __name__ == "__main__":
import doctest
doctest.testmod()
|
