Import unicode-width-0.1.7
Change-Id: Icef9ef036f60c2a7c1db838b5b1fd2874bef949a
diff --git a/scripts/unicode.py b/scripts/unicode.py
new file mode 100755
index 0000000..5456ee3
--- /dev/null
+++ b/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)