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venv/Lib/site-packages/fontTools/feaLib/error.py

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+class FeatureLibError(Exception):
+    def __init__(self, message, location):
+        Exception.__init__(self, message)
+        self.location = location
+
+    def __str__(self):
+        message = Exception.__str__(self)
+        if self.location:
+            return f"{self.location}: {message}"
+        else:
+            return message
+
+
+class IncludedFeaNotFound(FeatureLibError):
+    def __str__(self):
+        assert self.location is not None
+
+        message = (
+            "The following feature file should be included but cannot be found: "
+            f"{Exception.__str__(self)}"
+        )
+        return f"{self.location}: {message}"

venv/Lib/site-packages/fontTools/feaLib/lexer.py

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+from fontTools.feaLib.error import FeatureLibError, IncludedFeaNotFound
+from fontTools.feaLib.location import FeatureLibLocation
+import re
+import os
+
+
+class Lexer(object):
+    NUMBER = "NUMBER"
+    HEXADECIMAL = "HEXADECIMAL"
+    OCTAL = "OCTAL"
+    NUMBERS = (NUMBER, HEXADECIMAL, OCTAL)
+    FLOAT = "FLOAT"
+    STRING = "STRING"
+    NAME = "NAME"
+    FILENAME = "FILENAME"
+    GLYPHCLASS = "GLYPHCLASS"
+    CID = "CID"
+    SYMBOL = "SYMBOL"
+    COMMENT = "COMMENT"
+    NEWLINE = "NEWLINE"
+    ANONYMOUS_BLOCK = "ANONYMOUS_BLOCK"
+
+    CHAR_WHITESPACE_ = " \t"
+    CHAR_NEWLINE_ = "\r\n"
+    CHAR_SYMBOL_ = ",;:-+'{}[]<>()="
+    CHAR_DIGIT_ = "0123456789"
+    CHAR_HEXDIGIT_ = "0123456789ABCDEFabcdef"
+    CHAR_LETTER_ = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+    CHAR_NAME_START_ = CHAR_LETTER_ + "_+*:.^~!\\"
+    CHAR_NAME_CONTINUATION_ = CHAR_LETTER_ + CHAR_DIGIT_ + "_.+*:^~!/-"
+
+    RE_GLYPHCLASS = re.compile(r"^[A-Za-z_0-9.\-]+$")
+
+    MODE_NORMAL_ = "NORMAL"
+    MODE_FILENAME_ = "FILENAME"
+
+    def __init__(self, text, filename):
+        self.filename_ = filename
+        self.line_ = 1
+        self.pos_ = 0
+        self.line_start_ = 0
+        self.text_ = text
+        self.text_length_ = len(text)
+        self.mode_ = Lexer.MODE_NORMAL_
+
+    def __iter__(self):
+        return self
+
+    def next(self):  # Python 2
+        return self.__next__()
+
+    def __next__(self):  # Python 3
+        while True:
+            token_type, token, location = self.next_()
+            if token_type != Lexer.NEWLINE:
+                return (token_type, token, location)
+
+    def location_(self):
+        column = self.pos_ - self.line_start_ + 1
+        return FeatureLibLocation(self.filename_ or "<features>", self.line_, column)
+
+    def next_(self):
+        self.scan_over_(Lexer.CHAR_WHITESPACE_)
+        location = self.location_()
+        start = self.pos_
+        text = self.text_
+        limit = len(text)
+        if start >= limit:
+            raise StopIteration()
+        cur_char = text[start]
+        next_char = text[start + 1] if start + 1 < limit else None
+
+        if cur_char == "\n":
+            self.pos_ += 1
+            self.line_ += 1
+            self.line_start_ = self.pos_
+            return (Lexer.NEWLINE, None, location)
+        if cur_char == "\r":
+            self.pos_ += 2 if next_char == "\n" else 1
+            self.line_ += 1
+            self.line_start_ = self.pos_
+            return (Lexer.NEWLINE, None, location)
+        if cur_char == "#":
+            self.scan_until_(Lexer.CHAR_NEWLINE_)
+            return (Lexer.COMMENT, text[start : self.pos_], location)
+
+        if self.mode_ is Lexer.MODE_FILENAME_:
+            if cur_char != "(":
+                raise FeatureLibError("Expected '(' before file name", location)
+            self.scan_until_(")")
+            cur_char = text[self.pos_] if self.pos_ < limit else None
+            if cur_char != ")":
+                raise FeatureLibError("Expected ')' after file name", location)
+            self.pos_ += 1
+            self.mode_ = Lexer.MODE_NORMAL_
+            return (Lexer.FILENAME, text[start + 1 : self.pos_ - 1], location)
+
+        if cur_char == "\\" and next_char in Lexer.CHAR_DIGIT_:
+            self.pos_ += 1
+            self.scan_over_(Lexer.CHAR_DIGIT_)
+            return (Lexer.CID, int(text[start + 1 : self.pos_], 10), location)
+        if cur_char == "@":
+            self.pos_ += 1
+            self.scan_over_(Lexer.CHAR_NAME_CONTINUATION_)
+            glyphclass = text[start + 1 : self.pos_]
+            if len(glyphclass) < 1:
+                raise FeatureLibError("Expected glyph class name", location)
+            if len(glyphclass) > 63:
+                raise FeatureLibError(
+                    "Glyph class names must not be longer than 63 characters", location
+                )
+            if not Lexer.RE_GLYPHCLASS.match(glyphclass):
+                raise FeatureLibError(
+                    "Glyph class names must consist of letters, digits, "
+                    "underscore, period or hyphen",
+                    location,
+                )
+            return (Lexer.GLYPHCLASS, glyphclass, location)
+        if cur_char in Lexer.CHAR_NAME_START_:
+            self.pos_ += 1
+            self.scan_over_(Lexer.CHAR_NAME_CONTINUATION_)
+            token = text[start : self.pos_]
+            if token == "include":
+                self.mode_ = Lexer.MODE_FILENAME_
+            return (Lexer.NAME, token, location)
+        if cur_char == "0" and next_char in "xX":
+            self.pos_ += 2
+            self.scan_over_(Lexer.CHAR_HEXDIGIT_)
+            return (Lexer.HEXADECIMAL, int(text[start : self.pos_], 16), location)
+        if cur_char == "0" and next_char in Lexer.CHAR_DIGIT_:
+            self.scan_over_(Lexer.CHAR_DIGIT_)
+            return (Lexer.OCTAL, int(text[start : self.pos_], 8), location)
+        if cur_char in Lexer.CHAR_DIGIT_:
+            self.scan_over_(Lexer.CHAR_DIGIT_)
+            if self.pos_ >= limit or text[self.pos_] != ".":
+                return (Lexer.NUMBER, int(text[start : self.pos_], 10), location)
+            self.scan_over_(".")
+            self.scan_over_(Lexer.CHAR_DIGIT_)
+            return (Lexer.FLOAT, float(text[start : self.pos_]), location)
+        if cur_char == "-" and next_char in Lexer.CHAR_DIGIT_:
+            self.pos_ += 1
+            self.scan_over_(Lexer.CHAR_DIGIT_)
+            if self.pos_ >= limit or text[self.pos_] != ".":
+                return (Lexer.NUMBER, int(text[start : self.pos_], 10), location)
+            self.scan_over_(".")
+            self.scan_over_(Lexer.CHAR_DIGIT_)
+            return (Lexer.FLOAT, float(text[start : self.pos_]), location)
+        if cur_char in Lexer.CHAR_SYMBOL_:
+            self.pos_ += 1
+            return (Lexer.SYMBOL, cur_char, location)
+        if cur_char == '"':
+            self.pos_ += 1
+            self.scan_until_('"')
+            if self.pos_ < self.text_length_ and self.text_[self.pos_] == '"':
+                self.pos_ += 1
+                # strip newlines embedded within a string
+                string = re.sub("[\r\n]", "", text[start + 1 : self.pos_ - 1])
+                return (Lexer.STRING, string, location)
+            else:
+                raise FeatureLibError("Expected '\"' to terminate string", location)
+        raise FeatureLibError("Unexpected character: %r" % cur_char, location)
+
+    def scan_over_(self, valid):
+        p = self.pos_
+        while p < self.text_length_ and self.text_[p] in valid:
+            p += 1
+        self.pos_ = p
+
+    def scan_until_(self, stop_at):
+        p = self.pos_
+        while p < self.text_length_ and self.text_[p] not in stop_at:
+            p += 1
+        self.pos_ = p
+
+    def scan_anonymous_block(self, tag):
+        location = self.location_()
+        tag = tag.strip()
+        self.scan_until_(Lexer.CHAR_NEWLINE_)
+        self.scan_over_(Lexer.CHAR_NEWLINE_)
+        regexp = r"}\s*" + tag + r"\s*;"
+        split = re.split(regexp, self.text_[self.pos_ :], maxsplit=1)
+        if len(split) != 2:
+            raise FeatureLibError(
+                "Expected '} %s;' to terminate anonymous block" % tag, location
+            )
+        self.pos_ += len(split[0])
+        return (Lexer.ANONYMOUS_BLOCK, split[0], location)
+
+
+class IncludingLexer(object):
+    """A Lexer that follows include statements.
+
+    The OpenType feature file specification states that due to
+    historical reasons, relative imports should be resolved in this 
+    order:
+
+    1. If the source font is UFO format, then relative to the UFO's
+       font directory
+    2. relative to the top-level include file
+    3. relative to the parent include file
+
+    We only support 1 (via includeDir) and 2.
+    """
+
+    def __init__(self, featurefile, *, includeDir=None):
+        """Initializes an IncludingLexer.
+
+        Behavior:
+            If includeDir is passed, it will be used to determine the top-level
+            include directory to use for all encountered include statements. If it is
+            not passed, ``os.path.dirname(featurefile)`` will be considered the
+            include directory.
+        """
+
+        self.lexers_ = [self.make_lexer_(featurefile)]
+        self.featurefilepath = self.lexers_[0].filename_
+        self.includeDir = includeDir
+
+    def __iter__(self):
+        return self
+
+    def next(self):  # Python 2
+        return self.__next__()
+
+    def __next__(self):  # Python 3
+        while self.lexers_:
+            lexer = self.lexers_[-1]
+            try:
+                token_type, token, location = next(lexer)
+            except StopIteration:
+                self.lexers_.pop()
+                continue
+            if token_type is Lexer.NAME and token == "include":
+                fname_type, fname_token, fname_location = lexer.next()
+                if fname_type is not Lexer.FILENAME:
+                    raise FeatureLibError("Expected file name", fname_location)
+                # semi_type, semi_token, semi_location = lexer.next()
+                # if semi_type is not Lexer.SYMBOL or semi_token != ";":
+                #    raise FeatureLibError("Expected ';'", semi_location)
+                if os.path.isabs(fname_token):
+                    path = fname_token
+                else:
+                    if self.includeDir is not None:
+                        curpath = self.includeDir
+                    elif self.featurefilepath is not None:
+                        curpath = os.path.dirname(self.featurefilepath)
+                    else:
+                        # if the IncludingLexer was initialized from an in-memory
+                        # file-like stream, it doesn't have a 'name' pointing to
+                        # its filesystem path, therefore we fall back to using the
+                        # current working directory to resolve relative includes
+                        curpath = os.getcwd()
+                    path = os.path.join(curpath, fname_token)
+                if len(self.lexers_) >= 5:
+                    raise FeatureLibError("Too many recursive includes", fname_location)
+                try:
+                    self.lexers_.append(self.make_lexer_(path))
+                except FileNotFoundError as err:
+                    raise IncludedFeaNotFound(fname_token, fname_location) from err
+            else:
+                return (token_type, token, location)
+        raise StopIteration()
+
+    @staticmethod
+    def make_lexer_(file_or_path):
+        if hasattr(file_or_path, "read"):
+            fileobj, closing = file_or_path, False
+        else:
+            filename, closing = file_or_path, True
+            fileobj = open(filename, "r", encoding="utf-8")
+        data = fileobj.read()
+        filename = getattr(fileobj, "name", None)
+        if closing:
+            fileobj.close()
+        return Lexer(data, filename)
+
+    def scan_anonymous_block(self, tag):
+        return self.lexers_[-1].scan_anonymous_block(tag)
+
+
+class NonIncludingLexer(IncludingLexer):
+    """Lexer that does not follow `include` statements, emits them as-is."""
+
+    def __next__(self):  # Python 3
+        return next(self.lexers_[0])

venv/Lib/site-packages/fontTools/feaLib/location.py

@@ -0,0 +1,12 @@
+from typing import NamedTuple
+
+
+class FeatureLibLocation(NamedTuple):
+    """A location in a feature file"""
+
+    file: str
+    line: int
+    column: int
+
+    def __str__(self):
+        return f"{self.file}:{self.line}:{self.column}"

venv/Lib/site-packages/fontTools/feaLib/variableScalar.py

@@ -0,0 +1,97 @@
+from fontTools.varLib.models import VariationModel, normalizeValue
+
+
+def Location(loc):
+    return tuple(sorted(loc.items()))
+
+
+class VariableScalar:
+    """A scalar with different values at different points in the designspace."""
+
+    def __init__(self, location_value={}):
+        self.values = {}
+        self.axes = {}
+        for location, value in location_value.items():
+            self.add_value(location, value)
+
+    def __repr__(self):
+        items = []
+        for location, value in self.values.items():
+            loc = ",".join(["%s=%i" % (ax, loc) for ax, loc in location])
+            items.append("%s:%i" % (loc, value))
+        return "(" + (" ".join(items)) + ")"
+
+    @property
+    def does_vary(self):
+        values = list(self.values.values())
+        return any(v != values[0] for v in values[1:])
+
+    @property
+    def axes_dict(self):
+        if not self.axes:
+            raise ValueError(
+                ".axes must be defined on variable scalar before interpolating"
+            )
+        return {ax.axisTag: ax for ax in self.axes}
+
+    def _normalized_location(self, location):
+        location = self.fix_location(location)
+        normalized_location = {}
+        for axtag in location.keys():
+            if axtag not in self.axes_dict:
+                raise ValueError("Unknown axis %s in %s" % (axtag, location))
+            axis = self.axes_dict[axtag]
+            normalized_location[axtag] = normalizeValue(
+                location[axtag], (axis.minValue, axis.defaultValue, axis.maxValue)
+            )
+
+        return Location(normalized_location)
+
+    def fix_location(self, location):
+        location = dict(location)
+        for tag, axis in self.axes_dict.items():
+            if tag not in location:
+                location[tag] = axis.defaultValue
+        return location
+
+    def add_value(self, location, value):
+        if self.axes:
+            location = self.fix_location(location)
+
+        self.values[Location(location)] = value
+
+    def fix_all_locations(self):
+        self.values = {
+            Location(self.fix_location(l)): v for l, v in self.values.items()
+        }
+
+    @property
+    def default(self):
+        self.fix_all_locations()
+        key = Location({ax.axisTag: ax.defaultValue for ax in self.axes})
+        if key not in self.values:
+            raise ValueError("Default value could not be found")
+            # I *guess* we could interpolate one, but I don't know how.
+        return self.values[key]
+
+    def value_at_location(self, location):
+        loc = location
+        if loc in self.values.keys():
+            return self.values[loc]
+        values = list(self.values.values())
+        return self.model.interpolateFromMasters(loc, values)
+
+    @property
+    def model(self):
+        locations = [dict(self._normalized_location(k)) for k in self.values.keys()]
+        return VariationModel(locations)
+
+    def get_deltas_and_supports(self):
+        values = list(self.values.values())
+        return self.model.getDeltasAndSupports(values)
+
+    def add_to_variation_store(self, store_builder):
+        deltas, supports = self.get_deltas_and_supports()
+        store_builder.setSupports(supports)
+        index = store_builder.storeDeltas(deltas)
+        return int(self.default), index