mirror of https://gitee.com/openkylin/glib2.0.git
457 lines
14 KiB
Python
Executable File
457 lines
14 KiB
Python
Executable File
#!/usr/bin/env python3
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# Run this script like so:
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#
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# ./update-gtranslit.py /path/to/glibc/localedata/locales > gtranslit-data.h
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import os
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import sys
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localedir = sys.argv[1]
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# returns true if the name looks like a POSIX locale name
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def looks_like_locale(name):
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name, _, variant = name.partition("@")
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if "_" not in name:
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return False
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lang, _, land = name.partition("_")
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return len(lang) == 2 or len(lang) == 3 and len(land) == 2
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# handles <U1234> style escapes
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def unescape(string):
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chunks = []
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n = len(string)
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i = 0
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while i < n:
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start_escape = string.find("<", i)
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if start_escape == -1:
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chunks.append(string[i:])
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break
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assert string[start_escape : (start_escape + 2)] == "<U"
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start_escape += 2
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end_escape = string.find(">", start_escape)
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assert end_escape != -1
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chunks.append(chr(int(string[start_escape:end_escape], 16)))
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i = end_escape + 1
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return "".join(chunks)
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# Checks if a string is ascii
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def is_ascii(string):
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return all(ord(c) < 0x80 for c in string)
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# A Mapping is a map from non-ascii strings to ascii strings.
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#
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# It corresponds to a sequence of one or more mapping lines:
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#
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# <U00C4> "<U0041><U0308>";"<U0041><U0045>"
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#
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# in a file.
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class Mapping:
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def __init__(self):
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self.serialised = None
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self.mapping = {}
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# Scans a string like
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#
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# <U00C4> "<U0041><U0308>";"<U0041><U0045>" % \
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# LATIN CAPITAL LETTER A WITH DIAERESIS.
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#
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# and adds the first all-ascii choice (or IGNORE) to the mapping
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# dictionary, with the origin string as the key. In the case of
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# IGNORE, stores the empty string.
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def consider_mapping_line(self, line):
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key, value, rest = (line + " % comment").split(maxsplit=2)
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key = unescape(key)
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for alternative in value.split(";"):
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if alternative[0] == '"' and alternative[-1] == '"':
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unescaped = unescape(alternative[1:-1])
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if is_ascii(unescaped):
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self.mapping[key] = unescaped
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break
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elif alternative[0] == "<" and alternative[-1] == ">":
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unescaped = unescape(alternative)
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if is_ascii(unescaped):
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self.mapping[key] = unescaped
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break
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elif alternative == "IGNORE":
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self.mapping[key] = ""
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break
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# Performs a normal dictionary merge, but ensures that there are no
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# conflicting entries between the original dictionary and the requested
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# changes
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def merge_mapping(self, changes):
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for key in changes.mapping:
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if key in self.mapping:
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assert self.mapping[key] == changes.mapping[key]
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self.mapping.update(changes.mapping)
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# Can't get much flatter...
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def get_flattened(self):
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return [self]
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def serialise(self, serialiser):
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if self.serialised is None:
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self.serialised = serialiser.add_mapping(self.mapping)
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return self.serialised
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# A Chain is a sequence of mappings and chains.
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#
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# A chain contains another chain whenever "copy" or "include" is
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# encountered in a source file.
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#
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# A chain contains a mapping whenever a sequence of mapping lines:
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#
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# <U00C4> "<U0041><U0308>";"<U0041><U0045>"
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#
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# is encountered in a file.
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#
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# The order of lookup is reverse: later entries override earlier ones.
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class Chain:
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def __init__(self, name):
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self.serialised = None
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self.name = name
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self.chain = []
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self.links = 0
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self.read_from_file(os.path.join(localedir, name))
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def read_from_file(self, filename):
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current_mapping = None
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in_lc_ctype = False
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in_translit = False
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fp = open(filename, encoding="ascii", errors="surrogateescape")
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for line in fp:
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line = line.strip()
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if in_lc_ctype:
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if line == "END LC_CTYPE":
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break
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if line.startswith("copy") or line.startswith("include"):
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if current_mapping:
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self.chain.append(current_mapping)
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copyname = unescape(line.split('"', 3)[1])
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copyfile = get_chain(copyname)
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self.chain.append(copyfile)
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copyfile.links += 1
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current_mapping = None
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elif line == "translit_start":
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in_translit = True
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elif line == "translit_end":
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in_translit = False
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elif in_translit and line.startswith("<U"):
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if not current_mapping:
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current_mapping = Mapping()
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current_mapping.consider_mapping_line(line)
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elif line == "" or line.startswith("%"):
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pass
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elif "default_missing <U003F>":
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pass
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elif in_translit:
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print("unknown line:", line)
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assert False
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elif line == "LC_CTYPE":
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in_lc_ctype = True
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if current_mapping:
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self.chain.append(current_mapping)
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# If there is only one link to this chain, we may as well just
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# return the contents of the chain so that they can be merged into
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# our sole parent directly. Otherwise, return ourselves.
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def get_flattened(self):
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if self.links == 1:
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return sum((item.get_flattened() for item in self.chain), [])
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else:
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return [self]
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def serialise(self, serialiser):
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if self.serialised is None:
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# Before we serialise, see if we can optimise a bit
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self.chain = sum((item.get_flattened() for item in self.chain), [])
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i = 0
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while i < len(self.chain) - 1:
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if isinstance(self.chain[i], Mapping) and isinstance(
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self.chain[i + 1], Mapping
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):
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# We have two mappings in a row. Try to merge them.
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self.chain[i].merge_mapping(self.chain[i + 1])
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del self.chain[i + 1]
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else:
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i += 1
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# If all that is left is one item, just serialise that directly
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if len(self.chain) == 1:
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self.serialised = self.chain[0].serialise(serialiser)
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else:
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ids = [item.serialise(serialiser) for item in self.chain]
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self.serialised = serialiser.add_chain(ids)
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return self.serialised
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# Chain cache -- allows sharing of common chains
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chains = {}
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def get_chain(name):
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if name not in chains:
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chains[name] = Chain(name)
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return chains[name]
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# Remove the country name from a locale, preserving variant
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# eg: 'sr_RS@latin' -> 'sr@latin'
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def remove_country(string):
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base, at, variant = string.partition("@")
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lang, _, land = base.partition("_")
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return lang + at + variant
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def encode_range(start, end):
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assert start <= end
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length = end - start
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assert start < 0x1000
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assert length < 0x8
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result = 0x8000 + (length << 12) + start
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assert result < 0x10000
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return result
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def c_pair_array(array):
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return "{ " + ", ".join("{ %u, %u }" % pair for pair in array) + " };"
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class Serialiser:
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def __init__(self):
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self.mappings = []
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self.chains = []
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self.locales = {}
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def add_mapping(self, mapping):
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if mapping in self.mappings:
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mapping_id = self.mappings.index(mapping)
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else:
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mapping_id = len(self.mappings)
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self.mappings.append(mapping)
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assert mapping_id < 128
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return mapping_id
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def add_chain(self, chain):
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if chain in self.chains:
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chain_id = self.chains.index(chain)
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else:
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chain_id = len(self.chains)
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self.chains.append(chain)
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assert chain_id < 128
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return 128 + chain_id
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def add_locale(self, name, item_id):
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self.locales[name] = item_id
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def add_default(self, item_id):
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self.default = item_id
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def optimise_locales(self):
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# Check if all regions of a language/variant agree
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languages = list(set(remove_country(locale) for locale in self.locales))
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for language in languages:
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locales = [
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locale for locale in self.locales if remove_country(locale) == language
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]
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item_id = self.locales[locales[0]]
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if all(self.locales[locale] == item_id for locale in locales):
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self.locales[language] = item_id
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for locale in locales:
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del self.locales[locale]
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# Check if a variant is the same as the non-variant form
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# eg: 'de@euro' and 'de'
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for variant in list(locale for locale in self.locales if "@" in locale):
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base, _, _ = variant.partition("@")
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if base in self.locales and self.locales[base] == self.locales[variant]:
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del self.locales[variant]
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# Eliminate any entries that are just the same as the C locale
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for locale in list(self.locales):
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if self.locales[locale] == self.default:
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del self.locales[locale]
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def to_c(self):
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src_table = ""
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ascii_table = ""
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mappings_table = []
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mapping_ranges = []
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chains_table = []
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chain_starts = []
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locale_names = ""
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locale_index = []
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max_lookup = 0
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max_localename = 0
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for mapping in self.mappings:
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mapping_ranges.append((len(mappings_table), len(mapping)))
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for key in sorted(mapping):
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if len(key) == 1 and ord(key[0]) < 0x8000:
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src_range = ord(key[0])
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else:
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existing = src_table.find(key)
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if existing == -1:
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start = len(src_table)
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assert all(ord(c) <= 0x10FFFF for c in key)
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src_table += key
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src_range = encode_range(start, len(src_table))
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max_lookup = max(max_lookup, len(key))
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else:
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src_range = encode_range(existing, existing + len(key))
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value = mapping[key]
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if len(value) == 1 and ord(value[0]) < 0x80:
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ascii_range = ord(value[0])
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else:
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existing = ascii_table.find(value)
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if existing == -1:
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start = len(ascii_table)
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assert all(ord(c) < 0x80 for c in value)
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ascii_table += value
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ascii_range = encode_range(start, len(ascii_table))
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else:
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ascii_range = encode_range(existing, existing + len(value))
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mappings_table.append((src_range, ascii_range))
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for chain in self.chains:
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chain_starts.append(len(chains_table))
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for item_id in reversed(chain):
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assert item_id < 0xFF
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chains_table.append(item_id)
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chains_table.append(0xFF)
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for locale in sorted(self.locales):
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max_localename = max(max_localename, len(locale))
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name_offset = len(locale_names)
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assert all(ord(c) <= 0x7F for c in locale)
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locale_names += locale + "\0"
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item_id = self.locales[locale]
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assert name_offset < 256
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assert item_id < 256
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locale_index.append((name_offset, item_id))
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print("/* Generated by update-gtranslit.py */")
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print("#define MAX_KEY_SIZE", max_lookup)
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print("#define MAX_LOCALE_NAME", max_localename)
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print(
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"static const gunichar src_table[] = {",
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", ".join(str(ord(c)) for c in src_table),
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"};",
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)
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# cannot do this in plain ascii because of trigraphs... :(
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print(
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"static const gchar ascii_table[] = {",
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", ".join(str(ord(c)) for c in ascii_table),
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"};",
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)
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print(
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"static const struct mapping_entry mappings_table[] =",
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c_pair_array(mappings_table),
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)
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print(
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"static const struct mapping_range mapping_ranges[] =",
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c_pair_array(mapping_ranges),
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)
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print(
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"static const guint8 chains_table[] = {",
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", ".join(str(i) for i in chains_table),
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"};",
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)
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print(
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"static const guint8 chain_starts[] = {",
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", ".join(str(i) for i in chain_starts),
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"};",
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)
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print(
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'static const gchar locale_names[] = "'
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+ locale_names.replace("\0", "\\0")
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+ '";'
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)
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print(
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"static const struct locale_entry locale_index[] = ",
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c_pair_array(locale_index),
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)
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print("static const guint8 default_item_id = %u;" % (self.default,))
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def dump(self):
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print(self.mappings)
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print(self.chains)
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print(self.locales)
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locales = []
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for name in os.listdir(localedir):
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if looks_like_locale(name):
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chain = get_chain(name)
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locales.append(chain)
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chain.links += 1
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serialiser = Serialiser()
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for locale in locales:
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serialiser.add_locale(locale.name, locale.serialise(serialiser))
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i18n = get_chain("i18n").serialise(serialiser)
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combining = get_chain("translit_combining").serialise(serialiser)
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serialiser.add_default(serialiser.add_chain([i18n, combining]))
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serialiser.optimise_locales()
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serialiser.to_c()
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