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gecko-dev/third_party/rust/unicode-width/scripts/unicode.py

322 строки
10 KiB
Python
Executable File
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#!/usr/bin/env python3
#
# Copyright 2011-2015 The Rust Project Developers. See the COPYRIGHT
# file at the top-level directory of this distribution and at
# http://rust-lang.org/COPYRIGHT.
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.
# This script uses the following Unicode tables:
# - EastAsianWidth.txt
# - ReadMe.txt
# - UnicodeData.txt
#
# Since this should not require frequent updates, we just store this
# out-of-line and check the unicode.rs file into git.
import fileinput, re, os, sys, operator
preamble = '''// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// NOTE: The following code was generated by "scripts/unicode.py", do not edit directly
#![allow(missing_docs, non_upper_case_globals, non_snake_case)]
'''
# Mapping taken from Table 12 from:
# http://www.unicode.org/reports/tr44/#General_Category_Values
expanded_categories = {
'Lu': ['LC', 'L'], 'Ll': ['LC', 'L'], 'Lt': ['LC', 'L'],
'Lm': ['L'], 'Lo': ['L'],
'Mn': ['M'], 'Mc': ['M'], 'Me': ['M'],
'Nd': ['N'], 'Nl': ['N'], 'No': ['No'],
'Pc': ['P'], 'Pd': ['P'], 'Ps': ['P'], 'Pe': ['P'],
'Pi': ['P'], 'Pf': ['P'], 'Po': ['P'],
'Sm': ['S'], 'Sc': ['S'], 'Sk': ['S'], 'So': ['S'],
'Zs': ['Z'], 'Zl': ['Z'], 'Zp': ['Z'],
'Cc': ['C'], 'Cf': ['C'], 'Cs': ['C'], 'Co': ['C'], 'Cn': ['C'],
}
# these are the surrogate codepoints, which are not valid rust characters
surrogate_codepoints = (0xd800, 0xdfff)
def fetch(f):
if not os.path.exists(os.path.basename(f)):
os.system("curl -O http://www.unicode.org/Public/UNIDATA/%s"
% f)
if not os.path.exists(os.path.basename(f)):
sys.stderr.write("cannot load %s" % f)
exit(1)
def is_surrogate(n):
return surrogate_codepoints[0] <= n <= surrogate_codepoints[1]
def load_unicode_data(f):
fetch(f)
gencats = {}
udict = {}
range_start = -1
for line in fileinput.input(f):
data = line.split(';')
if len(data) != 15:
continue
cp = int(data[0], 16)
if is_surrogate(cp):
continue
if range_start >= 0:
for i in range(range_start, cp):
udict[i] = data
range_start = -1
if data[1].endswith(", First>"):
range_start = cp
continue
udict[cp] = data
for code in udict:
[code_org, name, gencat, combine, bidi,
decomp, deci, digit, num, mirror,
old, iso, upcase, lowcase, titlecase ] = udict[code]
# place letter in categories as appropriate
for cat in [gencat, "Assigned"] + expanded_categories.get(gencat, []):
if cat not in gencats:
gencats[cat] = []
gencats[cat].append(code)
gencats = group_cats(gencats)
return gencats
def group_cats(cats):
cats_out = {}
for cat in cats:
cats_out[cat] = group_cat(cats[cat])
return cats_out
def group_cat(cat):
cat_out = []
letters = sorted(set(cat))
cur_start = letters.pop(0)
cur_end = cur_start
for letter in letters:
assert letter > cur_end, \
"cur_end: %s, letter: %s" % (hex(cur_end), hex(letter))
if letter == cur_end + 1:
cur_end = letter
else:
cat_out.append((cur_start, cur_end))
cur_start = cur_end = letter
cat_out.append((cur_start, cur_end))
return cat_out
def format_table_content(f, content, indent):
line = " "*indent
first = True
for chunk in content.split(","):
if len(line) + len(chunk) < 98:
if first:
line += chunk
else:
line += ", " + chunk
first = False
else:
f.write(line + ",\n")
line = " "*indent + chunk
f.write(line)
# load all widths of want_widths, except those in except_cats
def load_east_asian_width(want_widths, except_cats):
f = "EastAsianWidth.txt"
fetch(f)
widths = {}
re1 = re.compile("^([0-9A-F]+);(\w+) +# (\w+)")
re2 = re.compile("^([0-9A-F]+)\.\.([0-9A-F]+);(\w+) +# (\w+)")
for line in fileinput.input(f):
width = None
d_lo = 0
d_hi = 0
cat = None
m = re1.match(line)
if m:
d_lo = m.group(1)
d_hi = m.group(1)
width = m.group(2)
cat = m.group(3)
else:
m = re2.match(line)
if m:
d_lo = m.group(1)
d_hi = m.group(2)
width = m.group(3)
cat = m.group(4)
else:
continue
if cat in except_cats or width not in want_widths:
continue
d_lo = int(d_lo, 16)
d_hi = int(d_hi, 16)
if width not in widths:
widths[width] = []
widths[width].append((d_lo, d_hi))
return widths
def escape_char(c):
return "'\\u{%x}'" % c
def emit_table(f, name, t_data, t_type = "&'static [(char, char)]", is_pub=True,
pfun=lambda x: "(%s,%s)" % (escape_char(x[0]), escape_char(x[1])), is_const=True):
pub_string = "const"
if not is_const:
pub_string = "let"
if is_pub:
pub_string = "pub " + pub_string
f.write(" %s %s: %s = &[\n" % (pub_string, name, t_type))
data = ""
first = True
for dat in t_data:
if not first:
data += ","
first = False
data += pfun(dat)
format_table_content(f, data, 8)
f.write("\n ];\n\n")
def emit_charwidth_module(f, width_table):
f.write("pub mod charwidth {")
f.write("""
use core::option::Option::{self, Some, None};
use core::result::Result::{Ok, Err};
#[inline]
fn bsearch_range_value_table(c: char, is_cjk: bool, r: &'static [(char, char, u8, u8)]) -> u8 {
use core::cmp::Ordering::{Equal, Less, Greater};
match r.binary_search_by(|&(lo, hi, _, _)| {
if lo <= c && c <= hi { Equal }
else if hi < c { Less }
else { Greater }
}) {
Ok(idx) => {
let (_, _, r_ncjk, r_cjk) = r[idx];
if is_cjk { r_cjk } else { r_ncjk }
}
Err(_) => 1
}
}
""")
f.write("""
#[inline]
pub fn width(c: char, is_cjk: bool) -> Option<usize> {
match c as usize {
_c @ 0 => Some(0), // null is zero width
cu if cu < 0x20 => None, // control sequences have no width
cu if cu < 0x7F => Some(1), // ASCII
cu if cu < 0xA0 => None, // more control sequences
_ => Some(bsearch_range_value_table(c, is_cjk, charwidth_table) as usize)
}
}
""")
f.write(" // character width table. Based on Markus Kuhn's free wcwidth() implementation,\n")
f.write(" // http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c\n")
emit_table(f, "charwidth_table", width_table, "&'static [(char, char, u8, u8)]", is_pub=False,
pfun=lambda x: "(%s,%s,%s,%s)" % (escape_char(x[0]), escape_char(x[1]), x[2], x[3]))
f.write("}\n\n")
def remove_from_wtable(wtable, val):
wtable_out = []
while wtable:
if wtable[0][1] < val:
wtable_out.append(wtable.pop(0))
elif wtable[0][0] > val:
break
else:
(wt_lo, wt_hi, width, width_cjk) = wtable.pop(0)
if wt_lo == wt_hi == val:
continue
elif wt_lo == val:
wtable_out.append((wt_lo+1, wt_hi, width, width_cjk))
elif wt_hi == val:
wtable_out.append((wt_lo, wt_hi-1, width, width_cjk))
else:
wtable_out.append((wt_lo, val-1, width, width_cjk))
wtable_out.append((val+1, wt_hi, width, width_cjk))
if wtable:
wtable_out.extend(wtable)
return wtable_out
def optimize_width_table(wtable):
wtable_out = []
w_this = wtable.pop(0)
while wtable:
if w_this[1] == wtable[0][0] - 1 and w_this[2:3] == wtable[0][2:3]:
w_tmp = wtable.pop(0)
w_this = (w_this[0], w_tmp[1], w_tmp[2], w_tmp[3])
else:
wtable_out.append(w_this)
w_this = wtable.pop(0)
wtable_out.append(w_this)
return wtable_out
if __name__ == "__main__":
r = "tables.rs"
if os.path.exists(r):
os.remove(r)
with open(r, "w") as rf:
# write the file's preamble
rf.write(preamble)
# download and parse all the data
fetch("ReadMe.txt")
with open("ReadMe.txt") as readme:
pattern = "for Version (\d+)\.(\d+)\.(\d+) of the Unicode"
unicode_version = re.search(pattern, readme.read()).groups()
rf.write("""
/// The version of [Unicode](http://www.unicode.org/)
/// that this version of unicode-width is based on.
pub const UNICODE_VERSION: (u64, u64, u64) = (%s, %s, %s);
""" % unicode_version)
gencats = load_unicode_data("UnicodeData.txt")
### character width module
width_table = []
for zwcat in ["Me", "Mn", "Cf"]:
width_table.extend([(lo_hi[0], lo_hi[1], 0, 0) for lo_hi in gencats[zwcat]])
width_table.append((4448, 4607, 0, 0))
# get widths, except those that are explicitly marked zero-width above
ea_widths = load_east_asian_width(["W", "F", "A"], ["Me", "Mn", "Cf"])
# these are doublewidth
for dwcat in ["W", "F"]:
width_table.extend([(lo_hi1[0], lo_hi1[1], 2, 2) for lo_hi1 in ea_widths[dwcat]])
width_table.extend([(lo_hi2[0], lo_hi2[1], 1, 2) for lo_hi2 in ea_widths["A"]])
width_table.sort(key=lambda w: w[0])
# soft hyphen is not zero width in preformatted text; it's used to indicate
# a hyphen inserted to facilitate a linebreak.
width_table = remove_from_wtable(width_table, 173)
# optimize the width table by collapsing adjacent entities when possible
width_table = optimize_width_table(width_table)
emit_charwidth_module(rf, width_table)
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