657 lines
24 KiB
Python
657 lines
24 KiB
Python
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import fontTools.voltLib.ast as ast
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from fontTools.voltLib.lexer import Lexer
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from fontTools.voltLib.error import VoltLibError
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from io import open
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PARSE_FUNCS = {
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"DEF_GLYPH": "parse_def_glyph_",
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"DEF_GROUP": "parse_def_group_",
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"DEF_SCRIPT": "parse_def_script_",
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"DEF_LOOKUP": "parse_def_lookup_",
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"DEF_ANCHOR": "parse_def_anchor_",
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"GRID_PPEM": "parse_ppem_",
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"PRESENTATION_PPEM": "parse_ppem_",
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"PPOSITIONING_PPEM": "parse_ppem_",
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"COMPILER_USEEXTENSIONLOOKUPS": "parse_noarg_option_",
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"COMPILER_USEPAIRPOSFORMAT2": "parse_noarg_option_",
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"CMAP_FORMAT": "parse_cmap_format",
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"DO_NOT_TOUCH_CMAP": "parse_noarg_option_",
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}
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class Parser(object):
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def __init__(self, path):
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self.doc_ = ast.VoltFile()
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self.glyphs_ = OrderedSymbolTable()
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self.groups_ = SymbolTable()
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self.anchors_ = {} # dictionary of SymbolTable() keyed by glyph
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self.scripts_ = SymbolTable()
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self.langs_ = SymbolTable()
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self.lookups_ = SymbolTable()
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self.next_token_type_, self.next_token_ = (None, None)
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self.next_token_location_ = None
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self.make_lexer_(path)
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self.advance_lexer_()
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def make_lexer_(self, file_or_path):
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if hasattr(file_or_path, "read"):
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filename = getattr(file_or_path, "name", None)
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data = file_or_path.read()
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else:
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filename = file_or_path
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with open(file_or_path, "r") as f:
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data = f.read()
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self.lexer_ = Lexer(data, filename)
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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_()
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if self.cur_token_ in PARSE_FUNCS.keys():
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func = getattr(self, PARSE_FUNCS[self.cur_token_])
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statements.append(func())
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elif self.is_cur_keyword_("END"):
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break
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else:
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raise VoltLibError(
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"Expected " + ", ".join(sorted(PARSE_FUNCS.keys())),
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self.cur_token_location_,
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)
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return self.doc_
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def parse_def_glyph_(self):
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assert self.is_cur_keyword_("DEF_GLYPH")
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location = self.cur_token_location_
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name = self.expect_string_()
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self.expect_keyword_("ID")
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gid = self.expect_number_()
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if gid < 0:
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raise VoltLibError("Invalid glyph ID", self.cur_token_location_)
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gunicode = None
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if self.next_token_ == "UNICODE":
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self.expect_keyword_("UNICODE")
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gunicode = [self.expect_number_()]
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if gunicode[0] < 0:
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raise VoltLibError("Invalid glyph UNICODE", self.cur_token_location_)
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elif self.next_token_ == "UNICODEVALUES":
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self.expect_keyword_("UNICODEVALUES")
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gunicode = self.parse_unicode_values_()
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gtype = None
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if self.next_token_ == "TYPE":
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self.expect_keyword_("TYPE")
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gtype = self.expect_name_()
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assert gtype in ("BASE", "LIGATURE", "MARK", "COMPONENT")
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components = None
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if self.next_token_ == "COMPONENTS":
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self.expect_keyword_("COMPONENTS")
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components = self.expect_number_()
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self.expect_keyword_("END_GLYPH")
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if self.glyphs_.resolve(name) is not None:
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raise VoltLibError(
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'Glyph "%s" (gid %i) already defined' % (name, gid), location
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)
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def_glyph = ast.GlyphDefinition(
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name, gid, gunicode, gtype, components, location=location
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)
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self.glyphs_.define(name, def_glyph)
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return def_glyph
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def parse_def_group_(self):
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assert self.is_cur_keyword_("DEF_GROUP")
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location = self.cur_token_location_
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name = self.expect_string_()
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enum = None
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if self.next_token_ == "ENUM":
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enum = self.parse_enum_()
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self.expect_keyword_("END_GROUP")
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if self.groups_.resolve(name) is not None:
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raise VoltLibError(
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'Glyph group "%s" already defined, '
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"group names are case insensitive" % name,
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location,
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)
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def_group = ast.GroupDefinition(name, enum, location=location)
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self.groups_.define(name, def_group)
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return def_group
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def parse_def_script_(self):
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assert self.is_cur_keyword_("DEF_SCRIPT")
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location = self.cur_token_location_
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name = None
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if self.next_token_ == "NAME":
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self.expect_keyword_("NAME")
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name = self.expect_string_()
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self.expect_keyword_("TAG")
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tag = self.expect_string_()
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if self.scripts_.resolve(tag) is not None:
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raise VoltLibError(
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'Script "%s" already defined, '
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"script tags are case insensitive" % tag,
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location,
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)
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self.langs_.enter_scope()
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langs = []
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while self.next_token_ != "END_SCRIPT":
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self.advance_lexer_()
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lang = self.parse_langsys_()
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self.expect_keyword_("END_LANGSYS")
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if self.langs_.resolve(lang.tag) is not None:
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raise VoltLibError(
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'Language "%s" already defined in script "%s", '
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"language tags are case insensitive" % (lang.tag, tag),
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location,
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)
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self.langs_.define(lang.tag, lang)
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langs.append(lang)
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self.expect_keyword_("END_SCRIPT")
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self.langs_.exit_scope()
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def_script = ast.ScriptDefinition(name, tag, langs, location=location)
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self.scripts_.define(tag, def_script)
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return def_script
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def parse_langsys_(self):
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assert self.is_cur_keyword_("DEF_LANGSYS")
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location = self.cur_token_location_
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name = None
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if self.next_token_ == "NAME":
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self.expect_keyword_("NAME")
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name = self.expect_string_()
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self.expect_keyword_("TAG")
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tag = self.expect_string_()
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features = []
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while self.next_token_ != "END_LANGSYS":
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self.advance_lexer_()
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feature = self.parse_feature_()
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self.expect_keyword_("END_FEATURE")
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features.append(feature)
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def_langsys = ast.LangSysDefinition(name, tag, features, location=location)
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return def_langsys
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def parse_feature_(self):
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assert self.is_cur_keyword_("DEF_FEATURE")
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location = self.cur_token_location_
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self.expect_keyword_("NAME")
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name = self.expect_string_()
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self.expect_keyword_("TAG")
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tag = self.expect_string_()
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lookups = []
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while self.next_token_ != "END_FEATURE":
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# self.advance_lexer_()
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self.expect_keyword_("LOOKUP")
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lookup = self.expect_string_()
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lookups.append(lookup)
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feature = ast.FeatureDefinition(name, tag, lookups, location=location)
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return feature
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def parse_def_lookup_(self):
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assert self.is_cur_keyword_("DEF_LOOKUP")
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location = self.cur_token_location_
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name = self.expect_string_()
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if not name[0].isalpha():
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raise VoltLibError(
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'Lookup name "%s" must start with a letter' % name, location
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)
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if self.lookups_.resolve(name) is not None:
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raise VoltLibError(
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'Lookup "%s" already defined, '
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"lookup names are case insensitive" % name,
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location,
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)
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process_base = True
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if self.next_token_ == "PROCESS_BASE":
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self.advance_lexer_()
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elif self.next_token_ == "SKIP_BASE":
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self.advance_lexer_()
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process_base = False
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process_marks = True
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mark_glyph_set = None
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if self.next_token_ == "PROCESS_MARKS":
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self.advance_lexer_()
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if self.next_token_ == "MARK_GLYPH_SET":
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self.advance_lexer_()
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mark_glyph_set = self.expect_string_()
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elif self.next_token_ == "ALL":
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self.advance_lexer_()
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elif self.next_token_ == "NONE":
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self.advance_lexer_()
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process_marks = False
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elif self.next_token_type_ == Lexer.STRING:
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process_marks = self.expect_string_()
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else:
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raise VoltLibError(
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"Expected ALL, NONE, MARK_GLYPH_SET or an ID. "
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"Got %s" % (self.next_token_type_),
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location,
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)
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elif self.next_token_ == "SKIP_MARKS":
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self.advance_lexer_()
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process_marks = False
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direction = None
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if self.next_token_ == "DIRECTION":
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self.expect_keyword_("DIRECTION")
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direction = self.expect_name_()
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assert direction in ("LTR", "RTL")
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reversal = None
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if self.next_token_ == "REVERSAL":
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self.expect_keyword_("REVERSAL")
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reversal = True
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comments = None
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if self.next_token_ == "COMMENTS":
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self.expect_keyword_("COMMENTS")
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comments = self.expect_string_().replace(r"\n", "\n")
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context = []
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while self.next_token_ in ("EXCEPT_CONTEXT", "IN_CONTEXT"):
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context = self.parse_context_()
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as_pos_or_sub = self.expect_name_()
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sub = None
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pos = None
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if as_pos_or_sub == "AS_SUBSTITUTION":
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sub = self.parse_substitution_(reversal)
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elif as_pos_or_sub == "AS_POSITION":
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pos = self.parse_position_()
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else:
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raise VoltLibError(
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"Expected AS_SUBSTITUTION or AS_POSITION. " "Got %s" % (as_pos_or_sub),
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location,
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)
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def_lookup = ast.LookupDefinition(
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name,
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process_base,
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process_marks,
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mark_glyph_set,
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direction,
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reversal,
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comments,
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context,
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sub,
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pos,
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location=location,
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)
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self.lookups_.define(name, def_lookup)
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return def_lookup
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def parse_context_(self):
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location = self.cur_token_location_
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contexts = []
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while self.next_token_ in ("EXCEPT_CONTEXT", "IN_CONTEXT"):
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side = None
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coverage = None
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ex_or_in = self.expect_name_()
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# side_contexts = [] # XXX
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if self.next_token_ != "END_CONTEXT":
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left = []
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right = []
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while self.next_token_ in ("LEFT", "RIGHT"):
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side = self.expect_name_()
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coverage = self.parse_coverage_()
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if side == "LEFT":
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left.append(coverage)
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else:
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right.append(coverage)
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self.expect_keyword_("END_CONTEXT")
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context = ast.ContextDefinition(
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ex_or_in, left, right, location=location
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)
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contexts.append(context)
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else:
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self.expect_keyword_("END_CONTEXT")
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return contexts
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def parse_substitution_(self, reversal):
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assert self.is_cur_keyword_("AS_SUBSTITUTION")
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location = self.cur_token_location_
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src = []
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dest = []
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if self.next_token_ != "SUB":
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raise VoltLibError("Expected SUB", location)
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while self.next_token_ == "SUB":
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self.expect_keyword_("SUB")
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src.append(self.parse_coverage_())
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self.expect_keyword_("WITH")
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dest.append(self.parse_coverage_())
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self.expect_keyword_("END_SUB")
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self.expect_keyword_("END_SUBSTITUTION")
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max_src = max([len(cov) for cov in src])
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max_dest = max([len(cov) for cov in dest])
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# many to many or mixed is invalid
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if (max_src > 1 and max_dest > 1) or (
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reversal and (max_src > 1 or max_dest > 1)
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):
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raise VoltLibError("Invalid substitution type", location)
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mapping = dict(zip(tuple(src), tuple(dest)))
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if max_src == 1 and max_dest == 1:
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if reversal:
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sub = ast.SubstitutionReverseChainingSingleDefinition(
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mapping, location=location
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)
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else:
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sub = ast.SubstitutionSingleDefinition(mapping, location=location)
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elif max_src == 1 and max_dest > 1:
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sub = ast.SubstitutionMultipleDefinition(mapping, location=location)
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elif max_src > 1 and max_dest == 1:
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sub = ast.SubstitutionLigatureDefinition(mapping, location=location)
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return sub
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def parse_position_(self):
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assert self.is_cur_keyword_("AS_POSITION")
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location = self.cur_token_location_
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pos_type = self.expect_name_()
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if pos_type not in ("ATTACH", "ATTACH_CURSIVE", "ADJUST_PAIR", "ADJUST_SINGLE"):
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raise VoltLibError(
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"Expected ATTACH, ATTACH_CURSIVE, ADJUST_PAIR, ADJUST_SINGLE", location
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)
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if pos_type == "ATTACH":
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position = self.parse_attach_()
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elif pos_type == "ATTACH_CURSIVE":
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position = self.parse_attach_cursive_()
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elif pos_type == "ADJUST_PAIR":
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position = self.parse_adjust_pair_()
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elif pos_type == "ADJUST_SINGLE":
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position = self.parse_adjust_single_()
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self.expect_keyword_("END_POSITION")
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return position
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def parse_attach_(self):
|
||
|
|
assert self.is_cur_keyword_("ATTACH")
|
||
|
|
location = self.cur_token_location_
|
||
|
|
coverage = self.parse_coverage_()
|
||
|
|
coverage_to = []
|
||
|
|
self.expect_keyword_("TO")
|
||
|
|
while self.next_token_ != "END_ATTACH":
|
||
|
|
cov = self.parse_coverage_()
|
||
|
|
self.expect_keyword_("AT")
|
||
|
|
self.expect_keyword_("ANCHOR")
|
||
|
|
anchor_name = self.expect_string_()
|
||
|
|
coverage_to.append((cov, anchor_name))
|
||
|
|
self.expect_keyword_("END_ATTACH")
|
||
|
|
position = ast.PositionAttachDefinition(
|
||
|
|
coverage, coverage_to, location=location
|
||
|
|
)
|
||
|
|
return position
|
||
|
|
|
||
|
|
def parse_attach_cursive_(self):
|
||
|
|
assert self.is_cur_keyword_("ATTACH_CURSIVE")
|
||
|
|
location = self.cur_token_location_
|
||
|
|
coverages_exit = []
|
||
|
|
coverages_enter = []
|
||
|
|
while self.next_token_ != "ENTER":
|
||
|
|
self.expect_keyword_("EXIT")
|
||
|
|
coverages_exit.append(self.parse_coverage_())
|
||
|
|
while self.next_token_ != "END_ATTACH":
|
||
|
|
self.expect_keyword_("ENTER")
|
||
|
|
coverages_enter.append(self.parse_coverage_())
|
||
|
|
self.expect_keyword_("END_ATTACH")
|
||
|
|
position = ast.PositionAttachCursiveDefinition(
|
||
|
|
coverages_exit, coverages_enter, location=location
|
||
|
|
)
|
||
|
|
return position
|
||
|
|
|
||
|
|
def parse_adjust_pair_(self):
|
||
|
|
assert self.is_cur_keyword_("ADJUST_PAIR")
|
||
|
|
location = self.cur_token_location_
|
||
|
|
coverages_1 = []
|
||
|
|
coverages_2 = []
|
||
|
|
adjust_pair = {}
|
||
|
|
while self.next_token_ == "FIRST":
|
||
|
|
self.advance_lexer_()
|
||
|
|
coverage_1 = self.parse_coverage_()
|
||
|
|
coverages_1.append(coverage_1)
|
||
|
|
while self.next_token_ == "SECOND":
|
||
|
|
self.advance_lexer_()
|
||
|
|
coverage_2 = self.parse_coverage_()
|
||
|
|
coverages_2.append(coverage_2)
|
||
|
|
while self.next_token_ != "END_ADJUST":
|
||
|
|
id_1 = self.expect_number_()
|
||
|
|
id_2 = self.expect_number_()
|
||
|
|
self.expect_keyword_("BY")
|
||
|
|
pos_1 = self.parse_pos_()
|
||
|
|
pos_2 = self.parse_pos_()
|
||
|
|
adjust_pair[(id_1, id_2)] = (pos_1, pos_2)
|
||
|
|
self.expect_keyword_("END_ADJUST")
|
||
|
|
position = ast.PositionAdjustPairDefinition(
|
||
|
|
coverages_1, coverages_2, adjust_pair, location=location
|
||
|
|
)
|
||
|
|
return position
|
||
|
|
|
||
|
|
def parse_adjust_single_(self):
|
||
|
|
assert self.is_cur_keyword_("ADJUST_SINGLE")
|
||
|
|
location = self.cur_token_location_
|
||
|
|
adjust_single = []
|
||
|
|
while self.next_token_ != "END_ADJUST":
|
||
|
|
coverages = self.parse_coverage_()
|
||
|
|
self.expect_keyword_("BY")
|
||
|
|
pos = self.parse_pos_()
|
||
|
|
adjust_single.append((coverages, pos))
|
||
|
|
self.expect_keyword_("END_ADJUST")
|
||
|
|
position = ast.PositionAdjustSingleDefinition(adjust_single, location=location)
|
||
|
|
return position
|
||
|
|
|
||
|
|
def parse_def_anchor_(self):
|
||
|
|
assert self.is_cur_keyword_("DEF_ANCHOR")
|
||
|
|
location = self.cur_token_location_
|
||
|
|
name = self.expect_string_()
|
||
|
|
self.expect_keyword_("ON")
|
||
|
|
gid = self.expect_number_()
|
||
|
|
self.expect_keyword_("GLYPH")
|
||
|
|
glyph_name = self.expect_name_()
|
||
|
|
self.expect_keyword_("COMPONENT")
|
||
|
|
component = self.expect_number_()
|
||
|
|
# check for duplicate anchor names on this glyph
|
||
|
|
if glyph_name in self.anchors_:
|
||
|
|
anchor = self.anchors_[glyph_name].resolve(name)
|
||
|
|
if anchor is not None and anchor.component == component:
|
||
|
|
raise VoltLibError(
|
||
|
|
'Anchor "%s" already defined, '
|
||
|
|
"anchor names are case insensitive" % name,
|
||
|
|
location,
|
||
|
|
)
|
||
|
|
if self.next_token_ == "LOCKED":
|
||
|
|
locked = True
|
||
|
|
self.advance_lexer_()
|
||
|
|
else:
|
||
|
|
locked = False
|
||
|
|
self.expect_keyword_("AT")
|
||
|
|
pos = self.parse_pos_()
|
||
|
|
self.expect_keyword_("END_ANCHOR")
|
||
|
|
anchor = ast.AnchorDefinition(
|
||
|
|
name, gid, glyph_name, component, locked, pos, location=location
|
||
|
|
)
|
||
|
|
if glyph_name not in self.anchors_:
|
||
|
|
self.anchors_[glyph_name] = SymbolTable()
|
||
|
|
self.anchors_[glyph_name].define(name, anchor)
|
||
|
|
return anchor
|
||
|
|
|
||
|
|
def parse_adjust_by_(self):
|
||
|
|
self.advance_lexer_()
|
||
|
|
assert self.is_cur_keyword_("ADJUST_BY")
|
||
|
|
adjustment = self.expect_number_()
|
||
|
|
self.expect_keyword_("AT")
|
||
|
|
size = self.expect_number_()
|
||
|
|
return adjustment, size
|
||
|
|
|
||
|
|
def parse_pos_(self):
|
||
|
|
# VOLT syntax doesn't seem to take device Y advance
|
||
|
|
self.advance_lexer_()
|
||
|
|
location = self.cur_token_location_
|
||
|
|
assert self.is_cur_keyword_("POS"), location
|
||
|
|
adv = None
|
||
|
|
dx = None
|
||
|
|
dy = None
|
||
|
|
adv_adjust_by = {}
|
||
|
|
dx_adjust_by = {}
|
||
|
|
dy_adjust_by = {}
|
||
|
|
if self.next_token_ == "ADV":
|
||
|
|
self.advance_lexer_()
|
||
|
|
adv = self.expect_number_()
|
||
|
|
while self.next_token_ == "ADJUST_BY":
|
||
|
|
adjustment, size = self.parse_adjust_by_()
|
||
|
|
adv_adjust_by[size] = adjustment
|
||
|
|
if self.next_token_ == "DX":
|
||
|
|
self.advance_lexer_()
|
||
|
|
dx = self.expect_number_()
|
||
|
|
while self.next_token_ == "ADJUST_BY":
|
||
|
|
adjustment, size = self.parse_adjust_by_()
|
||
|
|
dx_adjust_by[size] = adjustment
|
||
|
|
if self.next_token_ == "DY":
|
||
|
|
self.advance_lexer_()
|
||
|
|
dy = self.expect_number_()
|
||
|
|
while self.next_token_ == "ADJUST_BY":
|
||
|
|
adjustment, size = self.parse_adjust_by_()
|
||
|
|
dy_adjust_by[size] = adjustment
|
||
|
|
self.expect_keyword_("END_POS")
|
||
|
|
return ast.Pos(adv, dx, dy, adv_adjust_by, dx_adjust_by, dy_adjust_by)
|
||
|
|
|
||
|
|
def parse_unicode_values_(self):
|
||
|
|
location = self.cur_token_location_
|
||
|
|
try:
|
||
|
|
unicode_values = self.expect_string_().split(",")
|
||
|
|
unicode_values = [int(uni[2:], 16) for uni in unicode_values if uni != ""]
|
||
|
|
except ValueError as err:
|
||
|
|
raise VoltLibError(str(err), location)
|
||
|
|
return unicode_values if unicode_values != [] else None
|
||
|
|
|
||
|
|
def parse_enum_(self):
|
||
|
|
self.expect_keyword_("ENUM")
|
||
|
|
location = self.cur_token_location_
|
||
|
|
enum = ast.Enum(self.parse_coverage_(), location=location)
|
||
|
|
self.expect_keyword_("END_ENUM")
|
||
|
|
return enum
|
||
|
|
|
||
|
|
def parse_coverage_(self):
|
||
|
|
coverage = []
|
||
|
|
location = self.cur_token_location_
|
||
|
|
while self.next_token_ in ("GLYPH", "GROUP", "RANGE", "ENUM"):
|
||
|
|
if self.next_token_ == "ENUM":
|
||
|
|
enum = self.parse_enum_()
|
||
|
|
coverage.append(enum)
|
||
|
|
elif self.next_token_ == "GLYPH":
|
||
|
|
self.expect_keyword_("GLYPH")
|
||
|
|
name = self.expect_string_()
|
||
|
|
coverage.append(ast.GlyphName(name, location=location))
|
||
|
|
elif self.next_token_ == "GROUP":
|
||
|
|
self.expect_keyword_("GROUP")
|
||
|
|
name = self.expect_string_()
|
||
|
|
coverage.append(ast.GroupName(name, self, location=location))
|
||
|
|
elif self.next_token_ == "RANGE":
|
||
|
|
self.expect_keyword_("RANGE")
|
||
|
|
start = self.expect_string_()
|
||
|
|
self.expect_keyword_("TO")
|
||
|
|
end = self.expect_string_()
|
||
|
|
coverage.append(ast.Range(start, end, self, location=location))
|
||
|
|
return tuple(coverage)
|
||
|
|
|
||
|
|
def resolve_group(self, group_name):
|
||
|
|
return self.groups_.resolve(group_name)
|
||
|
|
|
||
|
|
def glyph_range(self, start, end):
|
||
|
|
return self.glyphs_.range(start, end)
|
||
|
|
|
||
|
|
def parse_ppem_(self):
|
||
|
|
location = self.cur_token_location_
|
||
|
|
ppem_name = self.cur_token_
|
||
|
|
value = self.expect_number_()
|
||
|
|
setting = ast.SettingDefinition(ppem_name, value, location=location)
|
||
|
|
return setting
|
||
|
|
|
||
|
|
def parse_noarg_option_(self):
|
||
|
|
location = self.cur_token_location_
|
||
|
|
name = self.cur_token_
|
||
|
|
value = True
|
||
|
|
setting = ast.SettingDefinition(name, value, location=location)
|
||
|
|
return setting
|
||
|
|
|
||
|
|
def parse_cmap_format(self):
|
||
|
|
location = self.cur_token_location_
|
||
|
|
name = self.cur_token_
|
||
|
|
value = (self.expect_number_(), self.expect_number_(), self.expect_number_())
|
||
|
|
setting = ast.SettingDefinition(name, value, location=location)
|
||
|
|
return setting
|
||
|
|
|
||
|
|
def is_cur_keyword_(self, k):
|
||
|
|
return (self.cur_token_type_ is Lexer.NAME) and (self.cur_token_ == k)
|
||
|
|
|
||
|
|
def expect_string_(self):
|
||
|
|
self.advance_lexer_()
|
||
|
|
if self.cur_token_type_ is not Lexer.STRING:
|
||
|
|
raise VoltLibError("Expected a string", self.cur_token_location_)
|
||
|
|
return self.cur_token_
|
||
|
|
|
||
|
|
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 VoltLibError('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 VoltLibError("Expected a name", self.cur_token_location_)
|
||
|
|
|
||
|
|
def expect_number_(self):
|
||
|
|
self.advance_lexer_()
|
||
|
|
if self.cur_token_type_ is not Lexer.NUMBER:
|
||
|
|
raise VoltLibError("Expected a number", self.cur_token_location_)
|
||
|
|
return self.cur_token_
|
||
|
|
|
||
|
|
def advance_lexer_(self):
|
||
|
|
self.cur_token_type_, self.cur_token_, self.cur_token_location_ = (
|
||
|
|
self.next_token_type_,
|
||
|
|
self.next_token_,
|
||
|
|
self.next_token_location_,
|
||
|
|
)
|
||
|
|
try:
|
||
|
|
if self.is_cur_keyword_("END"):
|
||
|
|
raise StopIteration
|
||
|
|
(
|
||
|
|
self.next_token_type_,
|
||
|
|
self.next_token_,
|
||
|
|
self.next_token_location_,
|
||
|
|
) = self.lexer_.next()
|
||
|
|
except StopIteration:
|
||
|
|
self.next_token_type_, self.next_token_ = (None, None)
|
||
|
|
|
||
|
|
|
||
|
|
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, case_insensitive=True):
|
||
|
|
for scope in reversed(self.scopes_):
|
||
|
|
item = scope.get(name)
|
||
|
|
if item:
|
||
|
|
return item
|
||
|
|
if case_insensitive:
|
||
|
|
for key in scope:
|
||
|
|
if key.lower() == name.lower():
|
||
|
|
return scope[key]
|
||
|
|
return None
|
||
|
|
|
||
|
|
|
||
|
|
class OrderedSymbolTable(SymbolTable):
|
||
|
|
def __init__(self):
|
||
|
|
self.scopes_ = [{}]
|
||
|
|
|
||
|
|
def enter_scope(self):
|
||
|
|
self.scopes_.append({})
|
||
|
|
|
||
|
|
def resolve(self, name, case_insensitive=False):
|
||
|
|
SymbolTable.resolve(self, name, case_insensitive=case_insensitive)
|
||
|
|
|
||
|
|
def range(self, start, end):
|
||
|
|
for scope in reversed(self.scopes_):
|
||
|
|
if start in scope and end in scope:
|
||
|
|
start_idx = list(scope.keys()).index(start)
|
||
|
|
end_idx = list(scope.keys()).index(end)
|
||
|
|
return list(scope.keys())[start_idx : end_idx + 1]
|
||
|
|
return None
|