534326bd1d
Before this change, the following glyph class: @Vowels = [@Vowels.lc @Vowels.uc y Y]; Would be written back as: @Vowels = [@Vowels.lc = [a e i o u]; @Vowels.uc = [A E I O U]; y Y]; Which is clearly invalid. It seems for GlyphClass.asFea() to work correctly here we should be using GlyphClassName not GlyphClass for the nested classes (similar to the code at the beginning of parse_glyphclass_()).
1476 lines
64 KiB
Python
1476 lines
64 KiB
Python
from __future__ import print_function, division, absolute_import
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from __future__ import unicode_literals
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from fontTools.feaLib.error import FeatureLibError
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from fontTools.feaLib.lexer import Lexer, IncludingLexer
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from fontTools.misc.encodingTools import getEncoding
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from fontTools.misc.py23 import *
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import fontTools.feaLib.ast as ast
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import logging
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import os
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import re
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log = logging.getLogger(__name__)
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class Parser(object):
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extensions = {}
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ast = ast
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def __init__(self, featurefile, glyphMap):
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self.glyphMap_ = glyphMap
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self.doc_ = self.ast.FeatureFile()
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self.anchors_ = SymbolTable()
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self.glyphclasses_ = SymbolTable()
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self.lookups_ = SymbolTable()
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self.valuerecords_ = SymbolTable()
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self.symbol_tables_ = {
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self.anchors_, self.valuerecords_
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}
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self.next_token_type_, self.next_token_ = (None, None)
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self.cur_comments_ = []
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self.next_token_location_ = None
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self.lexer_ = IncludingLexer(featurefile)
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self.advance_lexer_(comments=True)
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def parse(self):
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statements = self.doc_.statements
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while self.next_token_type_ is not None:
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self.advance_lexer_(comments=True)
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if self.cur_token_type_ is Lexer.COMMENT:
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statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
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elif self.cur_token_type_ is Lexer.GLYPHCLASS:
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statements.append(self.parse_glyphclass_definition_())
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elif self.is_cur_keyword_(("anon", "anonymous")):
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statements.append(self.parse_anonymous_())
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elif self.is_cur_keyword_("anchorDef"):
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statements.append(self.parse_anchordef_())
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elif self.is_cur_keyword_("languagesystem"):
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statements.append(self.parse_languagesystem_())
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elif self.is_cur_keyword_("lookup"):
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statements.append(self.parse_lookup_(vertical=False))
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elif self.is_cur_keyword_("markClass"):
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statements.append(self.parse_markClass_())
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elif self.is_cur_keyword_("feature"):
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statements.append(self.parse_feature_block_())
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elif self.is_cur_keyword_("table"):
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statements.append(self.parse_table_())
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elif self.is_cur_keyword_("valueRecordDef"):
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statements.append(
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self.parse_valuerecord_definition_(vertical=False))
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elif self.cur_token_type_ is Lexer.NAME and self.cur_token_ in self.extensions:
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statements.append(self.extensions[self.cur_token_](self))
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elif self.cur_token_type_ is Lexer.SYMBOL and self.cur_token_ == ";":
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continue
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else:
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raise FeatureLibError(
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"Expected feature, languagesystem, lookup, markClass, "
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"table, or glyph class definition, got {} \"{}\"".format(self.cur_token_type_, self.cur_token_),
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self.cur_token_location_)
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return self.doc_
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def parse_anchor_(self):
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self.expect_symbol_("<")
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self.expect_keyword_("anchor")
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location = self.cur_token_location_
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if self.next_token_ == "NULL":
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self.expect_keyword_("NULL")
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self.expect_symbol_(">")
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return None
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if self.next_token_type_ == Lexer.NAME:
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name = self.expect_name_()
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anchordef = self.anchors_.resolve(name)
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if anchordef is None:
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raise FeatureLibError(
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'Unknown anchor "%s"' % name,
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self.cur_token_location_)
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self.expect_symbol_(">")
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return self.ast.Anchor(location, name, anchordef.x, anchordef.y,
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anchordef.contourpoint,
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xDeviceTable=None, yDeviceTable=None)
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x, y = self.expect_number_(), self.expect_number_()
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contourpoint = None
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if self.next_token_ == "contourpoint":
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self.expect_keyword_("contourpoint")
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contourpoint = self.expect_number_()
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if self.next_token_ == "<":
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xDeviceTable = self.parse_device_()
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yDeviceTable = self.parse_device_()
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else:
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xDeviceTable, yDeviceTable = None, None
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self.expect_symbol_(">")
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return self.ast.Anchor(location, None, x, y, contourpoint,
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xDeviceTable, yDeviceTable)
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def parse_anchor_marks_(self):
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"""Parses a sequence of [<anchor> mark @MARKCLASS]*."""
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anchorMarks = [] # [(self.ast.Anchor, markClassName)*]
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while self.next_token_ == "<":
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anchor = self.parse_anchor_()
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if anchor is None and self.next_token_ != "mark":
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continue # <anchor NULL> without mark, eg. in GPOS type 5
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self.expect_keyword_("mark")
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markClass = self.expect_markClass_reference_()
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anchorMarks.append((anchor, markClass))
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return anchorMarks
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def parse_anchordef_(self):
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assert self.is_cur_keyword_("anchorDef")
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location = self.cur_token_location_
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x, y = self.expect_number_(), self.expect_number_()
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contourpoint = None
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if self.next_token_ == "contourpoint":
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self.expect_keyword_("contourpoint")
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contourpoint = self.expect_number_()
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name = self.expect_name_()
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self.expect_symbol_(";")
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anchordef = self.ast.AnchorDefinition(location, name, x, y, contourpoint)
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self.anchors_.define(name, anchordef)
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return anchordef
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def parse_anonymous_(self):
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assert self.is_cur_keyword_(("anon", "anonymous"))
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tag = self.expect_tag_()
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_, content, location = self.lexer_.scan_anonymous_block(tag)
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self.advance_lexer_()
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self.expect_symbol_('}')
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end_tag = self.expect_tag_()
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assert tag == end_tag, "bad splitting in Lexer.scan_anonymous_block()"
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self.expect_symbol_(';')
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return self.ast.AnonymousBlock(tag, content, location)
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def parse_attach_(self):
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assert self.is_cur_keyword_("Attach")
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location = self.cur_token_location_
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glyphs = self.parse_glyphclass_(accept_glyphname=True)
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contourPoints = {self.expect_number_()}
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while self.next_token_ != ";":
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contourPoints.add(self.expect_number_())
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self.expect_symbol_(";")
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return self.ast.AttachStatement(location, glyphs, contourPoints)
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def parse_enumerate_(self, vertical):
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assert self.cur_token_ in {"enumerate", "enum"}
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self.advance_lexer_()
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return self.parse_position_(enumerated=True, vertical=vertical)
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def parse_GlyphClassDef_(self):
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"""Parses 'GlyphClassDef @BASE, @LIGATURES, @MARKS, @COMPONENTS;'"""
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assert self.is_cur_keyword_("GlyphClassDef")
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location = self.cur_token_location_
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if self.next_token_ != ",":
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baseGlyphs = self.parse_glyphclass_(accept_glyphname=False)
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else:
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baseGlyphs = None
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self.expect_symbol_(",")
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if self.next_token_ != ",":
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ligatureGlyphs = self.parse_glyphclass_(accept_glyphname=False)
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else:
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ligatureGlyphs = None
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self.expect_symbol_(",")
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if self.next_token_ != ",":
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markGlyphs = self.parse_glyphclass_(accept_glyphname=False)
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else:
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markGlyphs = None
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self.expect_symbol_(",")
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if self.next_token_ != ";":
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componentGlyphs = self.parse_glyphclass_(accept_glyphname=False)
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else:
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componentGlyphs = None
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self.expect_symbol_(";")
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return self.ast.GlyphClassDefStatement(location, baseGlyphs, markGlyphs,
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ligatureGlyphs, componentGlyphs)
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def parse_glyphclass_definition_(self):
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"""Parses glyph class definitions such as '@UPPERCASE = [A-Z];'"""
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location, name = self.cur_token_location_, self.cur_token_
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self.expect_symbol_("=")
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glyphs = self.parse_glyphclass_(accept_glyphname=False)
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self.expect_symbol_(";")
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glyphclass = self.ast.GlyphClassDefinition(location, name, glyphs)
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self.glyphclasses_.define(name, glyphclass)
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return glyphclass
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def split_glyph_range_(self, name, location):
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# Since v1.20, the OpenType Feature File specification allows
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# for dashes in glyph names. A sequence like "a-b-c-d" could
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# therefore mean a single glyph whose name happens to be
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# "a-b-c-d", or it could mean a range from glyph "a" to glyph
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# "b-c-d", or a range from glyph "a-b" to glyph "c-d", or a
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# range from glyph "a-b-c" to glyph "d".Technically, this
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# example could be resolved because the (pretty complex)
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# definition of glyph ranges renders most of these splits
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# invalid. But the specification does not say that a compiler
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# should try to apply such fancy heuristics. To encourage
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# unambiguous feature files, we therefore try all possible
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# splits and reject the feature file if there are multiple
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# splits possible. It is intentional that we don't just emit a
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# warning; warnings tend to get ignored. To fix the problem,
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# font designers can trivially add spaces around the intended
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# split point, and we emit a compiler error that suggests
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# how exactly the source should be rewritten to make things
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# unambiguous.
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parts = name.split("-")
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solutions = []
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for i in range(len(parts)):
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start, limit = "-".join(parts[0:i]), "-".join(parts[i:])
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if start in self.glyphMap_ and limit in self.glyphMap_:
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solutions.append((start, limit))
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if len(solutions) == 1:
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start, limit = solutions[0]
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return start, limit
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elif len(solutions) == 0:
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raise FeatureLibError(
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"\"%s\" is not a glyph in the font, and it can not be split "
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"into a range of known glyphs" % name, location)
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else:
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ranges = " or ".join(["\"%s - %s\"" % (s, l) for s, l in solutions])
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raise FeatureLibError(
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"Ambiguous glyph range \"%s\"; "
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"please use %s to clarify what you mean" % (name, ranges),
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location)
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def parse_glyphclass_(self, accept_glyphname):
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if (accept_glyphname and
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self.next_token_type_ in (Lexer.NAME, Lexer.CID)):
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glyph = self.expect_glyph_()
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return self.ast.GlyphName(self.cur_token_location_, glyph)
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if self.next_token_type_ is Lexer.GLYPHCLASS:
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self.advance_lexer_()
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gc = self.glyphclasses_.resolve(self.cur_token_)
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if gc is None:
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raise FeatureLibError(
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"Unknown glyph class @%s" % self.cur_token_,
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self.cur_token_location_)
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if isinstance(gc, self.ast.MarkClass):
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return self.ast.MarkClassName(self.cur_token_location_, gc)
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else:
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return self.ast.GlyphClassName(self.cur_token_location_, gc)
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self.expect_symbol_("[")
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location = self.cur_token_location_
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glyphs = self.ast.GlyphClass(location)
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while self.next_token_ != "]":
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if self.next_token_type_ is Lexer.NAME:
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glyph = self.expect_glyph_()
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location = self.cur_token_location_
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if '-' in glyph and glyph not in self.glyphMap_:
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start, limit = self.split_glyph_range_(glyph, location)
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glyphs.add_range(
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start, limit,
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self.make_glyph_range_(location, start, limit))
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elif self.next_token_ == "-":
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start = glyph
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self.expect_symbol_("-")
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limit = self.expect_glyph_()
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glyphs.add_range(
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start, limit,
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self.make_glyph_range_(location, start, limit))
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else:
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glyphs.append(glyph)
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elif self.next_token_type_ is Lexer.CID:
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glyph = self.expect_glyph_()
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if self.next_token_ == "-":
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range_location = self.cur_token_location_
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range_start = self.cur_token_
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self.expect_symbol_("-")
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range_end = self.expect_cid_()
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glyphs.add_cid_range(range_start, range_end,
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self.make_cid_range_(range_location,
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range_start, range_end))
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else:
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glyphs.append("cid%05d" % self.cur_token_)
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elif self.next_token_type_ is Lexer.GLYPHCLASS:
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self.advance_lexer_()
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gc = self.glyphclasses_.resolve(self.cur_token_)
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if gc is None:
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raise FeatureLibError(
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"Unknown glyph class @%s" % self.cur_token_,
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self.cur_token_location_)
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if isinstance(gc, self.ast.MarkClass):
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gc = self.ast.MarkClassName(self.cur_token_location_, gc)
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else:
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gc = self.ast.GlyphClassName(self.cur_token_location_, gc)
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glyphs.add_class(gc)
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else:
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raise FeatureLibError(
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"Expected glyph name, glyph range, "
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"or glyph class reference",
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self.next_token_location_)
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self.expect_symbol_("]")
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return glyphs
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def parse_class_name_(self):
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name = self.expect_class_name_()
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gc = self.glyphclasses_.resolve(name)
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if gc is None:
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raise FeatureLibError(
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"Unknown glyph class @%s" % name,
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self.cur_token_location_)
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if isinstance(gc, self.ast.MarkClass):
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return self.ast.MarkClassName(self.cur_token_location_, gc)
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else:
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return self.ast.GlyphClassName(self.cur_token_location_, gc)
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def parse_glyph_pattern_(self, vertical):
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prefix, glyphs, lookups, values, suffix = ([], [], [], [], [])
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hasMarks = False
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while self.next_token_ not in {"by", "from", ";", ","}:
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gc = self.parse_glyphclass_(accept_glyphname=True)
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marked = False
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if self.next_token_ == "'":
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self.expect_symbol_("'")
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hasMarks = marked = True
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if marked:
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glyphs.append(gc)
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elif glyphs:
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suffix.append(gc)
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else:
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prefix.append(gc)
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if self.is_next_value_():
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values.append(self.parse_valuerecord_(vertical))
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else:
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values.append(None)
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lookup = None
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if self.next_token_ == "lookup":
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self.expect_keyword_("lookup")
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if not marked:
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raise FeatureLibError(
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"Lookups can only follow marked glyphs",
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self.cur_token_location_)
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lookup_name = self.expect_name_()
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lookup = self.lookups_.resolve(lookup_name)
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if lookup is None:
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raise FeatureLibError(
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'Unknown lookup "%s"' % lookup_name,
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self.cur_token_location_)
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if marked:
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lookups.append(lookup)
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if not glyphs and not suffix: # eg., "sub f f i by"
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assert lookups == []
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return ([], prefix, [None] * len(prefix), values, [], hasMarks)
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else:
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assert not any(values[:len(prefix)]), values
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values = values[len(prefix):][:len(glyphs)]
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return (prefix, glyphs, lookups, values, suffix, hasMarks)
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def parse_chain_context_(self):
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location = self.cur_token_location_
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prefix, glyphs, lookups, values, suffix, hasMarks = \
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self.parse_glyph_pattern_(vertical=False)
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chainContext = [(prefix, glyphs, suffix)]
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hasLookups = any(lookups)
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while self.next_token_ == ",":
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self.expect_symbol_(",")
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prefix, glyphs, lookups, values, suffix, hasMarks = \
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self.parse_glyph_pattern_(vertical=False)
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chainContext.append((prefix, glyphs, suffix))
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hasLookups = hasLookups or any(lookups)
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self.expect_symbol_(";")
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return chainContext, hasLookups
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def parse_ignore_(self):
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assert self.is_cur_keyword_("ignore")
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location = self.cur_token_location_
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self.advance_lexer_()
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if self.cur_token_ in ["substitute", "sub"]:
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chainContext, hasLookups = self.parse_chain_context_()
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if hasLookups:
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raise FeatureLibError(
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"No lookups can be specified for \"ignore sub\"",
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location)
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return self.ast.IgnoreSubstStatement(location, chainContext)
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if self.cur_token_ in ["position", "pos"]:
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chainContext, hasLookups = self.parse_chain_context_()
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if hasLookups:
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raise FeatureLibError(
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"No lookups can be specified for \"ignore pos\"",
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location)
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return self.ast.IgnorePosStatement(location, chainContext)
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raise FeatureLibError(
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"Expected \"substitute\" or \"position\"",
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self.cur_token_location_)
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def parse_language_(self):
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assert self.is_cur_keyword_("language")
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location = self.cur_token_location_
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language = self.expect_language_tag_()
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include_default, required = (True, False)
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if self.next_token_ in {"exclude_dflt", "include_dflt"}:
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include_default = (self.expect_name_() == "include_dflt")
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if self.next_token_ == "required":
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self.expect_keyword_("required")
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required = True
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self.expect_symbol_(";")
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return self.ast.LanguageStatement(location, language,
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include_default, required)
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def parse_ligatureCaretByIndex_(self):
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assert self.is_cur_keyword_("LigatureCaretByIndex")
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location = self.cur_token_location_
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glyphs = self.parse_glyphclass_(accept_glyphname=True)
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carets = [self.expect_number_()]
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while self.next_token_ != ";":
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carets.append(self.expect_number_())
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self.expect_symbol_(";")
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return self.ast.LigatureCaretByIndexStatement(location, glyphs, carets)
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def parse_ligatureCaretByPos_(self):
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assert self.is_cur_keyword_("LigatureCaretByPos")
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location = self.cur_token_location_
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glyphs = self.parse_glyphclass_(accept_glyphname=True)
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carets = [self.expect_number_()]
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while self.next_token_ != ";":
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carets.append(self.expect_number_())
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self.expect_symbol_(";")
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return self.ast.LigatureCaretByPosStatement(location, glyphs, carets)
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def parse_lookup_(self, vertical):
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assert self.is_cur_keyword_("lookup")
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location, name = self.cur_token_location_, self.expect_name_()
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if self.next_token_ == ";":
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lookup = self.lookups_.resolve(name)
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if lookup is None:
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raise FeatureLibError("Unknown lookup \"%s\"" % name,
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self.cur_token_location_)
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self.expect_symbol_(";")
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return self.ast.LookupReferenceStatement(location, lookup)
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use_extension = False
|
|
if self.next_token_ == "useExtension":
|
|
self.expect_keyword_("useExtension")
|
|
use_extension = True
|
|
|
|
block = self.ast.LookupBlock(location, name, use_extension)
|
|
self.parse_block_(block, vertical)
|
|
self.lookups_.define(name, block)
|
|
return block
|
|
|
|
def parse_lookupflag_(self):
|
|
assert self.is_cur_keyword_("lookupflag")
|
|
location = self.cur_token_location_
|
|
|
|
# format B: "lookupflag 6;"
|
|
if self.next_token_type_ == Lexer.NUMBER:
|
|
value = self.expect_number_()
|
|
self.expect_symbol_(";")
|
|
return self.ast.LookupFlagStatement(location, value, None, None)
|
|
|
|
# format A: "lookupflag RightToLeft MarkAttachmentType @M;"
|
|
value, markAttachment, markFilteringSet = 0, None, None
|
|
flags = {
|
|
"RightToLeft": 1, "IgnoreBaseGlyphs": 2,
|
|
"IgnoreLigatures": 4, "IgnoreMarks": 8
|
|
}
|
|
seen = set()
|
|
while self.next_token_ != ";":
|
|
if self.next_token_ in seen:
|
|
raise FeatureLibError(
|
|
"%s can be specified only once" % self.next_token_,
|
|
self.next_token_location_)
|
|
seen.add(self.next_token_)
|
|
if self.next_token_ == "MarkAttachmentType":
|
|
self.expect_keyword_("MarkAttachmentType")
|
|
markAttachment = self.parse_class_name_()
|
|
elif self.next_token_ == "UseMarkFilteringSet":
|
|
self.expect_keyword_("UseMarkFilteringSet")
|
|
markFilteringSet = self.parse_class_name_()
|
|
elif self.next_token_ in flags:
|
|
value = value | flags[self.expect_name_()]
|
|
else:
|
|
raise FeatureLibError(
|
|
'"%s" is not a recognized lookupflag' % self.next_token_,
|
|
self.next_token_location_)
|
|
self.expect_symbol_(";")
|
|
return self.ast.LookupFlagStatement(location, value,
|
|
markAttachment, markFilteringSet)
|
|
|
|
def parse_markClass_(self):
|
|
assert self.is_cur_keyword_("markClass")
|
|
location = self.cur_token_location_
|
|
glyphs = self.parse_glyphclass_(accept_glyphname=True)
|
|
anchor = self.parse_anchor_()
|
|
name = self.expect_class_name_()
|
|
self.expect_symbol_(";")
|
|
markClass = self.doc_.markClasses.get(name)
|
|
if markClass is None:
|
|
markClass = self.ast.MarkClass(name)
|
|
self.doc_.markClasses[name] = markClass
|
|
self.glyphclasses_.define(name, markClass)
|
|
mcdef = self.ast.MarkClassDefinition(location, markClass, anchor, glyphs)
|
|
markClass.addDefinition(mcdef)
|
|
return mcdef
|
|
|
|
def parse_position_(self, enumerated, vertical):
|
|
assert self.cur_token_ in {"position", "pos"}
|
|
if self.next_token_ == "cursive": # GPOS type 3
|
|
return self.parse_position_cursive_(enumerated, vertical)
|
|
elif self.next_token_ == "base": # GPOS type 4
|
|
return self.parse_position_base_(enumerated, vertical)
|
|
elif self.next_token_ == "ligature": # GPOS type 5
|
|
return self.parse_position_ligature_(enumerated, vertical)
|
|
elif self.next_token_ == "mark": # GPOS type 6
|
|
return self.parse_position_mark_(enumerated, vertical)
|
|
|
|
location = self.cur_token_location_
|
|
prefix, glyphs, lookups, values, suffix, hasMarks = \
|
|
self.parse_glyph_pattern_(vertical)
|
|
self.expect_symbol_(";")
|
|
|
|
if any(lookups):
|
|
# GPOS type 8: Chaining contextual positioning; explicit lookups
|
|
if any(values):
|
|
raise FeatureLibError(
|
|
"If \"lookup\" is present, no values must be specified",
|
|
location)
|
|
return self.ast.ChainContextPosStatement(
|
|
location, prefix, glyphs, suffix, lookups)
|
|
|
|
# Pair positioning, format A: "pos V 10 A -10;"
|
|
# Pair positioning, format B: "pos V A -20;"
|
|
if not prefix and not suffix and len(glyphs) == 2 and not hasMarks:
|
|
if values[0] is None: # Format B: "pos V A -20;"
|
|
values.reverse()
|
|
return self.ast.PairPosStatement(
|
|
location, enumerated,
|
|
glyphs[0], values[0], glyphs[1], values[1])
|
|
|
|
if enumerated:
|
|
raise FeatureLibError(
|
|
'"enumerate" is only allowed with pair positionings', location)
|
|
return self.ast.SinglePosStatement(location, list(zip(glyphs, values)),
|
|
prefix, suffix, forceChain=hasMarks)
|
|
|
|
def parse_position_cursive_(self, enumerated, vertical):
|
|
location = self.cur_token_location_
|
|
self.expect_keyword_("cursive")
|
|
if enumerated:
|
|
raise FeatureLibError(
|
|
'"enumerate" is not allowed with '
|
|
'cursive attachment positioning',
|
|
location)
|
|
glyphclass = self.parse_glyphclass_(accept_glyphname=True)
|
|
entryAnchor = self.parse_anchor_()
|
|
exitAnchor = self.parse_anchor_()
|
|
self.expect_symbol_(";")
|
|
return self.ast.CursivePosStatement(
|
|
location, glyphclass, entryAnchor, exitAnchor)
|
|
|
|
def parse_position_base_(self, enumerated, vertical):
|
|
location = self.cur_token_location_
|
|
self.expect_keyword_("base")
|
|
if enumerated:
|
|
raise FeatureLibError(
|
|
'"enumerate" is not allowed with '
|
|
'mark-to-base attachment positioning',
|
|
location)
|
|
base = self.parse_glyphclass_(accept_glyphname=True)
|
|
marks = self.parse_anchor_marks_()
|
|
self.expect_symbol_(";")
|
|
return self.ast.MarkBasePosStatement(location, base, marks)
|
|
|
|
def parse_position_ligature_(self, enumerated, vertical):
|
|
location = self.cur_token_location_
|
|
self.expect_keyword_("ligature")
|
|
if enumerated:
|
|
raise FeatureLibError(
|
|
'"enumerate" is not allowed with '
|
|
'mark-to-ligature attachment positioning',
|
|
location)
|
|
ligatures = self.parse_glyphclass_(accept_glyphname=True)
|
|
marks = [self.parse_anchor_marks_()]
|
|
while self.next_token_ == "ligComponent":
|
|
self.expect_keyword_("ligComponent")
|
|
marks.append(self.parse_anchor_marks_())
|
|
self.expect_symbol_(";")
|
|
return self.ast.MarkLigPosStatement(location, ligatures, marks)
|
|
|
|
def parse_position_mark_(self, enumerated, vertical):
|
|
location = self.cur_token_location_
|
|
self.expect_keyword_("mark")
|
|
if enumerated:
|
|
raise FeatureLibError(
|
|
'"enumerate" is not allowed with '
|
|
'mark-to-mark attachment positioning',
|
|
location)
|
|
baseMarks = self.parse_glyphclass_(accept_glyphname=True)
|
|
marks = self.parse_anchor_marks_()
|
|
self.expect_symbol_(";")
|
|
return self.ast.MarkMarkPosStatement(location, baseMarks, marks)
|
|
|
|
def parse_script_(self):
|
|
assert self.is_cur_keyword_("script")
|
|
location, script = self.cur_token_location_, self.expect_script_tag_()
|
|
self.expect_symbol_(";")
|
|
return self.ast.ScriptStatement(location, script)
|
|
|
|
def parse_substitute_(self):
|
|
assert self.cur_token_ in {"substitute", "sub", "reversesub", "rsub"}
|
|
location = self.cur_token_location_
|
|
reverse = self.cur_token_ in {"reversesub", "rsub"}
|
|
old_prefix, old, lookups, values, old_suffix, hasMarks = \
|
|
self.parse_glyph_pattern_(vertical=False)
|
|
if any(values):
|
|
raise FeatureLibError(
|
|
"Substitution statements cannot contain values", location)
|
|
new = []
|
|
if self.next_token_ == "by":
|
|
keyword = self.expect_keyword_("by")
|
|
while self.next_token_ != ";":
|
|
gc = self.parse_glyphclass_(accept_glyphname=True)
|
|
new.append(gc)
|
|
elif self.next_token_ == "from":
|
|
keyword = self.expect_keyword_("from")
|
|
new = [self.parse_glyphclass_(accept_glyphname=False)]
|
|
else:
|
|
keyword = None
|
|
self.expect_symbol_(";")
|
|
if len(new) is 0 and not any(lookups):
|
|
raise FeatureLibError(
|
|
'Expected "by", "from" or explicit lookup references',
|
|
self.cur_token_location_)
|
|
|
|
# GSUB lookup type 3: Alternate substitution.
|
|
# Format: "substitute a from [a.1 a.2 a.3];"
|
|
if keyword == "from":
|
|
if reverse:
|
|
raise FeatureLibError(
|
|
'Reverse chaining substitutions do not support "from"',
|
|
location)
|
|
if len(old) != 1 or len(old[0].glyphSet()) != 1:
|
|
raise FeatureLibError(
|
|
'Expected a single glyph before "from"',
|
|
location)
|
|
if len(new) != 1:
|
|
raise FeatureLibError(
|
|
'Expected a single glyphclass after "from"',
|
|
location)
|
|
return self.ast.AlternateSubstStatement(
|
|
location, old_prefix, old[0], old_suffix, new[0])
|
|
|
|
num_lookups = len([l for l in lookups if l is not None])
|
|
|
|
# GSUB lookup type 1: Single substitution.
|
|
# Format A: "substitute a by a.sc;"
|
|
# Format B: "substitute [one.fitted one.oldstyle] by one;"
|
|
# Format C: "substitute [a-d] by [A.sc-D.sc];"
|
|
if (not reverse and len(old) == 1 and len(new) == 1 and
|
|
num_lookups == 0):
|
|
glyphs = list(old[0].glyphSet())
|
|
replacements = list(new[0].glyphSet())
|
|
if len(replacements) == 1:
|
|
replacements = replacements * len(glyphs)
|
|
if len(glyphs) != len(replacements):
|
|
raise FeatureLibError(
|
|
'Expected a glyph class with %d elements after "by", '
|
|
'but found a glyph class with %d elements' %
|
|
(len(glyphs), len(replacements)), location)
|
|
return self.ast.SingleSubstStatement(
|
|
location, old, new,
|
|
old_prefix, old_suffix,
|
|
forceChain=hasMarks
|
|
)
|
|
|
|
# GSUB lookup type 2: Multiple substitution.
|
|
# Format: "substitute f_f_i by f f i;"
|
|
if (not reverse and
|
|
len(old) == 1 and len(old[0].glyphSet()) == 1 and
|
|
len(new) > 1 and max([len(n.glyphSet()) for n in new]) == 1 and
|
|
num_lookups == 0):
|
|
return self.ast.MultipleSubstStatement(
|
|
location, old_prefix, tuple(old[0].glyphSet())[0], old_suffix,
|
|
tuple([list(n.glyphSet())[0] for n in new]))
|
|
|
|
# GSUB lookup type 4: Ligature substitution.
|
|
# Format: "substitute f f i by f_f_i;"
|
|
if (not reverse and
|
|
len(old) > 1 and len(new) == 1 and
|
|
len(new[0].glyphSet()) == 1 and
|
|
num_lookups == 0):
|
|
return self.ast.LigatureSubstStatement(
|
|
location, old_prefix, old, old_suffix,
|
|
list(new[0].glyphSet())[0], forceChain=hasMarks)
|
|
|
|
# GSUB lookup type 8: Reverse chaining substitution.
|
|
if reverse:
|
|
if len(old) != 1:
|
|
raise FeatureLibError(
|
|
"In reverse chaining single substitutions, "
|
|
"only a single glyph or glyph class can be replaced",
|
|
location)
|
|
if len(new) != 1:
|
|
raise FeatureLibError(
|
|
'In reverse chaining single substitutions, '
|
|
'the replacement (after "by") must be a single glyph '
|
|
'or glyph class', location)
|
|
if num_lookups != 0:
|
|
raise FeatureLibError(
|
|
"Reverse chaining substitutions cannot call named lookups",
|
|
location)
|
|
glyphs = sorted(list(old[0].glyphSet()))
|
|
replacements = sorted(list(new[0].glyphSet()))
|
|
if len(replacements) == 1:
|
|
replacements = replacements * len(glyphs)
|
|
if len(glyphs) != len(replacements):
|
|
raise FeatureLibError(
|
|
'Expected a glyph class with %d elements after "by", '
|
|
'but found a glyph class with %d elements' %
|
|
(len(glyphs), len(replacements)), location)
|
|
return self.ast.ReverseChainSingleSubstStatement(
|
|
location, old_prefix, old_suffix, old, new)
|
|
|
|
# GSUB lookup type 6: Chaining contextual substitution.
|
|
assert len(new) == 0, new
|
|
rule = self.ast.ChainContextSubstStatement(
|
|
location, old_prefix, old, old_suffix, lookups)
|
|
return rule
|
|
|
|
def parse_subtable_(self):
|
|
assert self.is_cur_keyword_("subtable")
|
|
location = self.cur_token_location_
|
|
self.expect_symbol_(";")
|
|
return self.ast.SubtableStatement(location)
|
|
|
|
def parse_size_parameters_(self):
|
|
assert self.is_cur_keyword_("parameters")
|
|
location = self.cur_token_location_
|
|
DesignSize = self.expect_decipoint_()
|
|
SubfamilyID = self.expect_number_()
|
|
RangeStart = 0
|
|
RangeEnd = 0
|
|
if self.next_token_type_ in (Lexer.NUMBER, Lexer.FLOAT) or \
|
|
SubfamilyID != 0:
|
|
RangeStart = self.expect_decipoint_()
|
|
RangeEnd = self.expect_decipoint_()
|
|
|
|
self.expect_symbol_(";")
|
|
return self.ast.SizeParameters(location, DesignSize, SubfamilyID,
|
|
RangeStart, RangeEnd)
|
|
|
|
def parse_size_menuname_(self):
|
|
assert self.is_cur_keyword_("sizemenuname")
|
|
location = self.cur_token_location_
|
|
platformID, platEncID, langID, string = self.parse_name_()
|
|
return self.ast.FeatureNameStatement(location, "size", platformID,
|
|
platEncID, langID, string)
|
|
|
|
def parse_table_(self):
|
|
assert self.is_cur_keyword_("table")
|
|
location, name = self.cur_token_location_, self.expect_tag_()
|
|
table = self.ast.TableBlock(location, name)
|
|
self.expect_symbol_("{")
|
|
handler = {
|
|
"GDEF": self.parse_table_GDEF_,
|
|
"head": self.parse_table_head_,
|
|
"hhea": self.parse_table_hhea_,
|
|
"vhea": self.parse_table_vhea_,
|
|
"name": self.parse_table_name_,
|
|
"BASE": self.parse_table_BASE_,
|
|
"OS/2": self.parse_table_OS_2_,
|
|
}.get(name)
|
|
if handler:
|
|
handler(table)
|
|
else:
|
|
raise FeatureLibError('"table %s" is not supported' % name.strip(),
|
|
location)
|
|
self.expect_symbol_("}")
|
|
end_tag = self.expect_tag_()
|
|
if end_tag != name:
|
|
raise FeatureLibError('Expected "%s"' % name.strip(),
|
|
self.cur_token_location_)
|
|
self.expect_symbol_(";")
|
|
return table
|
|
|
|
def parse_table_GDEF_(self, table):
|
|
statements = table.statements
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.is_cur_keyword_("Attach"):
|
|
statements.append(self.parse_attach_())
|
|
elif self.is_cur_keyword_("GlyphClassDef"):
|
|
statements.append(self.parse_GlyphClassDef_())
|
|
elif self.is_cur_keyword_("LigatureCaretByIndex"):
|
|
statements.append(self.parse_ligatureCaretByIndex_())
|
|
elif self.is_cur_keyword_("LigatureCaretByPos"):
|
|
statements.append(self.parse_ligatureCaretByPos_())
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
else:
|
|
raise FeatureLibError(
|
|
"Expected Attach, LigatureCaretByIndex, "
|
|
"or LigatureCaretByPos",
|
|
self.cur_token_location_)
|
|
|
|
def parse_table_head_(self, table):
|
|
statements = table.statements
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.is_cur_keyword_("FontRevision"):
|
|
statements.append(self.parse_FontRevision_())
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
else:
|
|
raise FeatureLibError("Expected FontRevision",
|
|
self.cur_token_location_)
|
|
|
|
def parse_table_hhea_(self, table):
|
|
statements = table.statements
|
|
fields = ("CaretOffset", "Ascender", "Descender", "LineGap")
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.cur_token_type_ is Lexer.NAME and self.cur_token_ in fields:
|
|
key = self.cur_token_.lower()
|
|
value = self.expect_number_()
|
|
statements.append(
|
|
self.ast.HheaField(self.cur_token_location_, key, value))
|
|
if self.next_token_ != ";":
|
|
raise FeatureLibError("Incomplete statement", self.next_token_location_)
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
else:
|
|
raise FeatureLibError("Expected CaretOffset, Ascender, "
|
|
"Descender or LineGap",
|
|
self.cur_token_location_)
|
|
|
|
def parse_table_vhea_(self, table):
|
|
statements = table.statements
|
|
fields = ("VertTypoAscender", "VertTypoDescender", "VertTypoLineGap")
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.cur_token_type_ is Lexer.NAME and self.cur_token_ in fields:
|
|
key = self.cur_token_.lower()
|
|
value = self.expect_number_()
|
|
statements.append(
|
|
self.ast.VheaField(self.cur_token_location_, key, value))
|
|
if self.next_token_ != ";":
|
|
raise FeatureLibError("Incomplete statement", self.next_token_location_)
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
else:
|
|
raise FeatureLibError("Expected VertTypoAscender, "
|
|
"VertTypoDescender or VertTypoLineGap",
|
|
self.cur_token_location_)
|
|
|
|
def parse_table_name_(self, table):
|
|
statements = table.statements
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.is_cur_keyword_("nameid"):
|
|
statement = self.parse_nameid_()
|
|
if statement:
|
|
statements.append(statement)
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
else:
|
|
raise FeatureLibError("Expected nameid",
|
|
self.cur_token_location_)
|
|
|
|
def parse_name_(self):
|
|
platEncID = None
|
|
langID = None
|
|
if self.next_token_type_ == Lexer.NUMBER:
|
|
platformID = self.expect_number_()
|
|
location = self.cur_token_location_
|
|
if platformID not in (1, 3):
|
|
raise FeatureLibError("Expected platform id 1 or 3", location)
|
|
if self.next_token_type_ == Lexer.NUMBER:
|
|
platEncID = self.expect_number_()
|
|
langID = self.expect_number_()
|
|
else:
|
|
platformID = 3
|
|
location = self.cur_token_location_
|
|
|
|
if platformID == 1: # Macintosh
|
|
platEncID = platEncID or 0 # Roman
|
|
langID = langID or 0 # English
|
|
else: # 3, Windows
|
|
platEncID = platEncID or 1 # Unicode
|
|
langID = langID or 0x0409 # English
|
|
|
|
string = self.expect_string_()
|
|
self.expect_symbol_(";")
|
|
|
|
encoding = getEncoding(platformID, platEncID, langID)
|
|
if encoding is None:
|
|
raise FeatureLibError("Unsupported encoding", location)
|
|
unescaped = self.unescape_string_(string, encoding)
|
|
return platformID, platEncID, langID, unescaped
|
|
|
|
def parse_nameid_(self):
|
|
assert self.cur_token_ == "nameid", self.cur_token_
|
|
location, nameID = self.cur_token_location_, self.expect_number_()
|
|
if nameID > 32767:
|
|
raise FeatureLibError("Name id value cannot be greater than 32767",
|
|
self.cur_token_location_)
|
|
if 1 <= nameID <= 6:
|
|
log.warning("Name id %d cannot be set from the feature file. "
|
|
"Ignoring record" % nameID)
|
|
self.parse_name_() # skip to the next record
|
|
return None
|
|
|
|
platformID, platEncID, langID, string = self.parse_name_()
|
|
return self.ast.NameRecord(location, nameID, platformID, platEncID,
|
|
langID, string)
|
|
|
|
def unescape_string_(self, string, encoding):
|
|
if encoding == "utf_16_be":
|
|
s = re.sub(r"\\[0-9a-fA-F]{4}", self.unescape_unichr_, string)
|
|
else:
|
|
unescape = lambda m: self.unescape_byte_(m, encoding)
|
|
s = re.sub(r"\\[0-9a-fA-F]{2}", unescape, string)
|
|
# We now have a Unicode string, but it might contain surrogate pairs.
|
|
# We convert surrogates to actual Unicode by round-tripping through
|
|
# Python's UTF-16 codec in a special mode.
|
|
utf16 = tobytes(s, "utf_16_be", "surrogatepass")
|
|
return tounicode(utf16, "utf_16_be")
|
|
|
|
@staticmethod
|
|
def unescape_unichr_(match):
|
|
n = match.group(0)[1:]
|
|
return unichr(int(n, 16))
|
|
|
|
@staticmethod
|
|
def unescape_byte_(match, encoding):
|
|
n = match.group(0)[1:]
|
|
return bytechr(int(n, 16)).decode(encoding)
|
|
|
|
def parse_table_BASE_(self, table):
|
|
statements = table.statements
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.is_cur_keyword_("HorizAxis.BaseTagList"):
|
|
horiz_bases = self.parse_base_tag_list_()
|
|
elif self.is_cur_keyword_("HorizAxis.BaseScriptList"):
|
|
horiz_scripts = self.parse_base_script_list_(len(horiz_bases))
|
|
statements.append(
|
|
self.ast.BaseAxis(self.cur_token_location_, horiz_bases,
|
|
horiz_scripts, False))
|
|
elif self.is_cur_keyword_("VertAxis.BaseTagList"):
|
|
vert_bases = self.parse_base_tag_list_()
|
|
elif self.is_cur_keyword_("VertAxis.BaseScriptList"):
|
|
vert_scripts = self.parse_base_script_list_(len(vert_bases))
|
|
statements.append(
|
|
self.ast.BaseAxis(self.cur_token_location_, vert_bases,
|
|
vert_scripts, True))
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
|
|
def parse_table_OS_2_(self, table):
|
|
statements = table.statements
|
|
numbers = ("FSType", "TypoAscender", "TypoDescender", "TypoLineGap",
|
|
"winAscent", "winDescent", "XHeight", "CapHeight",
|
|
"WeightClass", "WidthClass", "LowerOpSize", "UpperOpSize")
|
|
ranges = ("UnicodeRange", "CodePageRange")
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.cur_token_type_ is Lexer.NAME:
|
|
key = self.cur_token_.lower()
|
|
value = None
|
|
if self.cur_token_ in numbers:
|
|
value = self.expect_number_()
|
|
elif self.is_cur_keyword_("Panose"):
|
|
value = []
|
|
for i in range(10):
|
|
value.append(self.expect_number_())
|
|
elif self.cur_token_ in ranges:
|
|
value = []
|
|
while self.next_token_ != ";":
|
|
value.append(self.expect_number_())
|
|
elif self.is_cur_keyword_("Vendor"):
|
|
value = self.expect_string_()
|
|
statements.append(
|
|
self.ast.OS2Field(self.cur_token_location_, key, value))
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
|
|
def parse_base_tag_list_(self):
|
|
assert self.cur_token_ in ("HorizAxis.BaseTagList",
|
|
"VertAxis.BaseTagList"), self.cur_token_
|
|
bases = []
|
|
while self.next_token_ != ";":
|
|
bases.append(self.expect_script_tag_())
|
|
self.expect_symbol_(";")
|
|
return bases
|
|
|
|
def parse_base_script_list_(self, count):
|
|
assert self.cur_token_ in ("HorizAxis.BaseScriptList",
|
|
"VertAxis.BaseScriptList"), self.cur_token_
|
|
scripts = [(self.parse_base_script_record_(count))]
|
|
while self.next_token_ == ",":
|
|
self.expect_symbol_(",")
|
|
scripts.append(self.parse_base_script_record_(count))
|
|
self.expect_symbol_(";")
|
|
return scripts
|
|
|
|
def parse_base_script_record_(self, count):
|
|
script_tag = self.expect_script_tag_()
|
|
base_tag = self.expect_script_tag_()
|
|
coords = [self.expect_number_() for i in range(count)]
|
|
return script_tag, base_tag, coords
|
|
|
|
def parse_device_(self):
|
|
result = None
|
|
self.expect_symbol_("<")
|
|
self.expect_keyword_("device")
|
|
if self.next_token_ == "NULL":
|
|
self.expect_keyword_("NULL")
|
|
else:
|
|
result = [(self.expect_number_(), self.expect_number_())]
|
|
while self.next_token_ == ",":
|
|
self.expect_symbol_(",")
|
|
result.append((self.expect_number_(), self.expect_number_()))
|
|
result = tuple(result) # make it hashable
|
|
self.expect_symbol_(">")
|
|
return result
|
|
|
|
def is_next_value_(self):
|
|
return self.next_token_type_ is Lexer.NUMBER or self.next_token_ == "<"
|
|
|
|
def parse_valuerecord_(self, vertical):
|
|
if self.next_token_type_ is Lexer.NUMBER:
|
|
number, location = self.expect_number_(), self.cur_token_location_
|
|
if vertical:
|
|
val = self.ast.ValueRecord(location, vertical,
|
|
None, None, None, number,
|
|
None, None, None, None)
|
|
else:
|
|
val = self.ast.ValueRecord(location, vertical,
|
|
None, None, number, None,
|
|
None, None, None, None)
|
|
return val
|
|
self.expect_symbol_("<")
|
|
location = self.cur_token_location_
|
|
if self.next_token_type_ is Lexer.NAME:
|
|
name = self.expect_name_()
|
|
if name == "NULL":
|
|
self.expect_symbol_(">")
|
|
return None
|
|
vrd = self.valuerecords_.resolve(name)
|
|
if vrd is None:
|
|
raise FeatureLibError("Unknown valueRecordDef \"%s\"" % name,
|
|
self.cur_token_location_)
|
|
value = vrd.value
|
|
xPlacement, yPlacement = (value.xPlacement, value.yPlacement)
|
|
xAdvance, yAdvance = (value.xAdvance, value.yAdvance)
|
|
else:
|
|
xPlacement, yPlacement, xAdvance, yAdvance = (
|
|
self.expect_number_(), self.expect_number_(),
|
|
self.expect_number_(), self.expect_number_())
|
|
|
|
if self.next_token_ == "<":
|
|
xPlaDevice, yPlaDevice, xAdvDevice, yAdvDevice = (
|
|
self.parse_device_(), self.parse_device_(),
|
|
self.parse_device_(), self.parse_device_())
|
|
allDeltas = sorted([
|
|
delta
|
|
for size, delta
|
|
in (xPlaDevice if xPlaDevice else ()) +
|
|
(yPlaDevice if yPlaDevice else ()) +
|
|
(xAdvDevice if xAdvDevice else ()) +
|
|
(yAdvDevice if yAdvDevice else ())])
|
|
if allDeltas[0] < -128 or allDeltas[-1] > 127:
|
|
raise FeatureLibError(
|
|
"Device value out of valid range (-128..127)",
|
|
self.cur_token_location_)
|
|
else:
|
|
xPlaDevice, yPlaDevice, xAdvDevice, yAdvDevice = (
|
|
None, None, None, None)
|
|
|
|
self.expect_symbol_(">")
|
|
return self.ast.ValueRecord(
|
|
location, vertical, xPlacement, yPlacement, xAdvance, yAdvance,
|
|
xPlaDevice, yPlaDevice, xAdvDevice, yAdvDevice)
|
|
|
|
def parse_valuerecord_definition_(self, vertical):
|
|
assert self.is_cur_keyword_("valueRecordDef")
|
|
location = self.cur_token_location_
|
|
value = self.parse_valuerecord_(vertical)
|
|
name = self.expect_name_()
|
|
self.expect_symbol_(";")
|
|
vrd = self.ast.ValueRecordDefinition(location, name, value)
|
|
self.valuerecords_.define(name, vrd)
|
|
return vrd
|
|
|
|
def parse_languagesystem_(self):
|
|
assert self.cur_token_ == "languagesystem"
|
|
location = self.cur_token_location_
|
|
script = self.expect_script_tag_()
|
|
language = self.expect_language_tag_()
|
|
self.expect_symbol_(";")
|
|
if script == "DFLT" and language != "dflt":
|
|
raise FeatureLibError(
|
|
'For script "DFLT", the language must be "dflt"',
|
|
self.cur_token_location_)
|
|
return self.ast.LanguageSystemStatement(location, script, language)
|
|
|
|
def parse_feature_block_(self):
|
|
assert self.cur_token_ == "feature"
|
|
location = self.cur_token_location_
|
|
tag = self.expect_tag_()
|
|
vertical = (tag in {"vkrn", "vpal", "vhal", "valt"})
|
|
stylisticset = None
|
|
if tag in ["ss%02d" % i for i in range(1, 20+1)]:
|
|
stylisticset = tag
|
|
|
|
size_feature = (tag == "size")
|
|
|
|
use_extension = False
|
|
if self.next_token_ == "useExtension":
|
|
self.expect_keyword_("useExtension")
|
|
use_extension = True
|
|
|
|
block = self.ast.FeatureBlock(location, tag, use_extension)
|
|
self.parse_block_(block, vertical, stylisticset, size_feature)
|
|
return block
|
|
|
|
def parse_feature_reference_(self):
|
|
assert self.cur_token_ == "feature", self.cur_token_
|
|
location = self.cur_token_location_
|
|
featureName = self.expect_tag_()
|
|
self.expect_symbol_(";")
|
|
return self.ast.FeatureReferenceStatement(location, featureName)
|
|
|
|
def parse_featureNames_(self, tag):
|
|
assert self.cur_token_ == "featureNames", self.cur_token_
|
|
block = self.ast.FeatureNamesBlock(self.cur_token_location_)
|
|
self.expect_symbol_("{")
|
|
for symtab in self.symbol_tables_:
|
|
symtab.enter_scope()
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
block.statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.is_cur_keyword_("name"):
|
|
location = self.cur_token_location_
|
|
platformID, platEncID, langID, string = self.parse_name_()
|
|
block.statements.append(
|
|
self.ast.FeatureNameStatement(location, tag, platformID,
|
|
platEncID, langID, string))
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
else:
|
|
raise FeatureLibError('Expected "name"',
|
|
self.cur_token_location_)
|
|
self.expect_symbol_("}")
|
|
for symtab in self.symbol_tables_:
|
|
symtab.exit_scope()
|
|
self.expect_symbol_(";")
|
|
return block
|
|
|
|
def parse_FontRevision_(self):
|
|
assert self.cur_token_ == "FontRevision", self.cur_token_
|
|
location, version = self.cur_token_location_, self.expect_float_()
|
|
self.expect_symbol_(";")
|
|
if version <= 0:
|
|
raise FeatureLibError("Font revision numbers must be positive",
|
|
location)
|
|
return self.ast.FontRevisionStatement(location, version)
|
|
|
|
def parse_block_(self, block, vertical, stylisticset=None,
|
|
size_feature=False):
|
|
self.expect_symbol_("{")
|
|
for symtab in self.symbol_tables_:
|
|
symtab.enter_scope()
|
|
|
|
statements = block.statements
|
|
while self.next_token_ != "}" or self.cur_comments_:
|
|
self.advance_lexer_(comments=True)
|
|
if self.cur_token_type_ is Lexer.COMMENT:
|
|
statements.append(self.ast.Comment(self.cur_token_location_, self.cur_token_))
|
|
elif self.cur_token_type_ is Lexer.GLYPHCLASS:
|
|
statements.append(self.parse_glyphclass_definition_())
|
|
elif self.is_cur_keyword_("anchorDef"):
|
|
statements.append(self.parse_anchordef_())
|
|
elif self.is_cur_keyword_({"enum", "enumerate"}):
|
|
statements.append(self.parse_enumerate_(vertical=vertical))
|
|
elif self.is_cur_keyword_("feature"):
|
|
statements.append(self.parse_feature_reference_())
|
|
elif self.is_cur_keyword_("ignore"):
|
|
statements.append(self.parse_ignore_())
|
|
elif self.is_cur_keyword_("language"):
|
|
statements.append(self.parse_language_())
|
|
elif self.is_cur_keyword_("lookup"):
|
|
statements.append(self.parse_lookup_(vertical))
|
|
elif self.is_cur_keyword_("lookupflag"):
|
|
statements.append(self.parse_lookupflag_())
|
|
elif self.is_cur_keyword_("markClass"):
|
|
statements.append(self.parse_markClass_())
|
|
elif self.is_cur_keyword_({"pos", "position"}):
|
|
statements.append(
|
|
self.parse_position_(enumerated=False, vertical=vertical))
|
|
elif self.is_cur_keyword_("script"):
|
|
statements.append(self.parse_script_())
|
|
elif (self.is_cur_keyword_({"sub", "substitute",
|
|
"rsub", "reversesub"})):
|
|
statements.append(self.parse_substitute_())
|
|
elif self.is_cur_keyword_("subtable"):
|
|
statements.append(self.parse_subtable_())
|
|
elif self.is_cur_keyword_("valueRecordDef"):
|
|
statements.append(self.parse_valuerecord_definition_(vertical))
|
|
elif stylisticset and self.is_cur_keyword_("featureNames"):
|
|
statements.append(self.parse_featureNames_(stylisticset))
|
|
elif size_feature and self.is_cur_keyword_("parameters"):
|
|
statements.append(self.parse_size_parameters_())
|
|
elif size_feature and self.is_cur_keyword_("sizemenuname"):
|
|
statements.append(self.parse_size_menuname_())
|
|
elif self.cur_token_type_ is Lexer.NAME and self.cur_token_ in self.extensions:
|
|
statements.append(self.extensions[self.cur_token_](self))
|
|
elif self.cur_token_ == ";":
|
|
continue
|
|
else:
|
|
raise FeatureLibError(
|
|
"Expected glyph class definition or statement: got {} {}".format(self.cur_token_type_, self.cur_token_),
|
|
self.cur_token_location_)
|
|
|
|
self.expect_symbol_("}")
|
|
for symtab in self.symbol_tables_:
|
|
symtab.exit_scope()
|
|
|
|
name = self.expect_name_()
|
|
if name != block.name.strip():
|
|
raise FeatureLibError("Expected \"%s\"" % block.name.strip(),
|
|
self.cur_token_location_)
|
|
self.expect_symbol_(";")
|
|
|
|
def is_cur_keyword_(self, k):
|
|
if self.cur_token_type_ is Lexer.NAME:
|
|
if isinstance(k, type("")): # basestring is gone in Python3
|
|
return self.cur_token_ == k
|
|
else:
|
|
return self.cur_token_ in k
|
|
return False
|
|
|
|
def expect_class_name_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is not Lexer.GLYPHCLASS:
|
|
raise FeatureLibError("Expected @NAME", self.cur_token_location_)
|
|
return self.cur_token_
|
|
|
|
def expect_cid_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.CID:
|
|
return self.cur_token_
|
|
raise FeatureLibError("Expected a CID", self.cur_token_location_)
|
|
|
|
def expect_glyph_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.NAME:
|
|
self.cur_token_ = self.cur_token_.lstrip("\\")
|
|
if len(self.cur_token_) > 63:
|
|
raise FeatureLibError(
|
|
"Glyph names must not be longer than 63 characters",
|
|
self.cur_token_location_)
|
|
return self.cur_token_
|
|
elif self.cur_token_type_ is Lexer.CID:
|
|
return "cid%05d" % self.cur_token_
|
|
raise FeatureLibError("Expected a glyph name or CID",
|
|
self.cur_token_location_)
|
|
|
|
def expect_markClass_reference_(self):
|
|
name = self.expect_class_name_()
|
|
mc = self.glyphclasses_.resolve(name)
|
|
if mc is None:
|
|
raise FeatureLibError("Unknown markClass @%s" % name,
|
|
self.cur_token_location_)
|
|
if not isinstance(mc, self.ast.MarkClass):
|
|
raise FeatureLibError("@%s is not a markClass" % name,
|
|
self.cur_token_location_)
|
|
return mc
|
|
|
|
def expect_tag_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is not Lexer.NAME:
|
|
raise FeatureLibError("Expected a tag", self.cur_token_location_)
|
|
if len(self.cur_token_) > 4:
|
|
raise FeatureLibError("Tags can not be longer than 4 characters",
|
|
self.cur_token_location_)
|
|
return (self.cur_token_ + " ")[:4]
|
|
|
|
def expect_script_tag_(self):
|
|
tag = self.expect_tag_()
|
|
if tag == "dflt":
|
|
raise FeatureLibError(
|
|
'"dflt" is not a valid script tag; use "DFLT" instead',
|
|
self.cur_token_location_)
|
|
return tag
|
|
|
|
def expect_language_tag_(self):
|
|
tag = self.expect_tag_()
|
|
if tag == "DFLT":
|
|
raise FeatureLibError(
|
|
'"DFLT" is not a valid language tag; use "dflt" instead',
|
|
self.cur_token_location_)
|
|
return tag
|
|
|
|
def expect_symbol_(self, symbol):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.SYMBOL and self.cur_token_ == symbol:
|
|
return symbol
|
|
raise FeatureLibError("Expected '%s'" % symbol,
|
|
self.cur_token_location_)
|
|
|
|
def expect_keyword_(self, keyword):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.NAME and self.cur_token_ == keyword:
|
|
return self.cur_token_
|
|
raise FeatureLibError("Expected \"%s\"" % keyword,
|
|
self.cur_token_location_)
|
|
|
|
def expect_name_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.NAME:
|
|
return self.cur_token_
|
|
raise FeatureLibError("Expected a name", self.cur_token_location_)
|
|
|
|
def expect_number_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.NUMBER:
|
|
return self.cur_token_
|
|
raise FeatureLibError("Expected a number", self.cur_token_location_)
|
|
|
|
def expect_float_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.FLOAT:
|
|
return self.cur_token_
|
|
raise FeatureLibError("Expected a floating-point number",
|
|
self.cur_token_location_)
|
|
|
|
def expect_decipoint_(self):
|
|
if self.next_token_type_ == Lexer.FLOAT:
|
|
return self.expect_float_()
|
|
elif self.next_token_type_ is Lexer.NUMBER:
|
|
return self.expect_number_() / 10
|
|
else:
|
|
raise FeatureLibError("Expected an integer or floating-point number",
|
|
self.cur_token_location_)
|
|
|
|
def expect_string_(self):
|
|
self.advance_lexer_()
|
|
if self.cur_token_type_ is Lexer.STRING:
|
|
return self.cur_token_
|
|
raise FeatureLibError("Expected a string", self.cur_token_location_)
|
|
|
|
def advance_lexer_(self, comments=False):
|
|
if comments and self.cur_comments_:
|
|
self.cur_token_type_ = Lexer.COMMENT
|
|
self.cur_token_, self.cur_token_location_ = self.cur_comments_.pop(0)
|
|
return
|
|
else:
|
|
self.cur_token_type_, self.cur_token_, self.cur_token_location_ = (
|
|
self.next_token_type_, self.next_token_, self.next_token_location_)
|
|
self.cur_comments_ = []
|
|
while True:
|
|
try:
|
|
(self.next_token_type_, self.next_token_,
|
|
self.next_token_location_) = next(self.lexer_)
|
|
except StopIteration:
|
|
self.next_token_type_, self.next_token_ = (None, None)
|
|
if self.next_token_type_ != Lexer.COMMENT:
|
|
break
|
|
self.cur_comments_.append((self.next_token_, self.next_token_location_))
|
|
|
|
@staticmethod
|
|
def reverse_string_(s):
|
|
"""'abc' --> 'cba'"""
|
|
return ''.join(reversed(list(s)))
|
|
|
|
def make_cid_range_(self, location, start, limit):
|
|
"""(location, 999, 1001) --> ["cid00999", "cid01000", "cid01001"]"""
|
|
result = list()
|
|
if start > limit:
|
|
raise FeatureLibError(
|
|
"Bad range: start should be less than limit", location)
|
|
for cid in range(start, limit + 1):
|
|
result.append("cid%05d" % cid)
|
|
return result
|
|
|
|
def make_glyph_range_(self, location, start, limit):
|
|
"""(location, "a.sc", "d.sc") --> ["a.sc", "b.sc", "c.sc", "d.sc"]"""
|
|
result = list()
|
|
if len(start) != len(limit):
|
|
raise FeatureLibError(
|
|
"Bad range: \"%s\" and \"%s\" should have the same length" %
|
|
(start, limit), location)
|
|
|
|
rev = self.reverse_string_
|
|
prefix = os.path.commonprefix([start, limit])
|
|
suffix = rev(os.path.commonprefix([rev(start), rev(limit)]))
|
|
if len(suffix) > 0:
|
|
start_range = start[len(prefix):-len(suffix)]
|
|
limit_range = limit[len(prefix):-len(suffix)]
|
|
else:
|
|
start_range = start[len(prefix):]
|
|
limit_range = limit[len(prefix):]
|
|
|
|
if start_range >= limit_range:
|
|
raise FeatureLibError(
|
|
"Start of range must be smaller than its end",
|
|
location)
|
|
|
|
uppercase = re.compile(r'^[A-Z]$')
|
|
if uppercase.match(start_range) and uppercase.match(limit_range):
|
|
for c in range(ord(start_range), ord(limit_range) + 1):
|
|
result.append("%s%c%s" % (prefix, c, suffix))
|
|
return result
|
|
|
|
lowercase = re.compile(r'^[a-z]$')
|
|
if lowercase.match(start_range) and lowercase.match(limit_range):
|
|
for c in range(ord(start_range), ord(limit_range) + 1):
|
|
result.append("%s%c%s" % (prefix, c, suffix))
|
|
return result
|
|
|
|
digits = re.compile(r'^[0-9]{1,3}$')
|
|
if digits.match(start_range) and digits.match(limit_range):
|
|
for i in range(int(start_range, 10), int(limit_range, 10) + 1):
|
|
number = ("000" + str(i))[-len(start_range):]
|
|
result.append("%s%s%s" % (prefix, number, suffix))
|
|
return result
|
|
|
|
raise FeatureLibError("Bad range: \"%s-%s\"" % (start, limit),
|
|
location)
|
|
|
|
|
|
class SymbolTable(object):
|
|
def __init__(self):
|
|
self.scopes_ = [{}]
|
|
|
|
def enter_scope(self):
|
|
self.scopes_.append({})
|
|
|
|
def exit_scope(self):
|
|
self.scopes_.pop()
|
|
|
|
def define(self, name, item):
|
|
self.scopes_[-1][name] = item
|
|
|
|
def resolve(self, name):
|
|
for scope in reversed(self.scopes_):
|
|
item = scope.get(name)
|
|
if item:
|
|
return item
|
|
return None
|