| #!/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: (u8, u8, u8) = (%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) |
