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Diffstat (limited to 'unicode-width/scripts/unicode.py')
| -rwxr-xr-x | unicode-width/scripts/unicode.py | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/unicode-width/scripts/unicode.py b/unicode-width/scripts/unicode.py new file mode 100755 index 0000000..5456ee3 --- /dev/null +++ b/unicode-width/scripts/unicode.py @@ -0,0 +1,321 @@ +#!/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) |