Improve fontconfig fallback font queries for emoji

2026-07-27 18:51:41 +02:00 · 2017-12-07 09:52:48 +05:30
parent 9cda51b5a8
commit ef6f4c2fbf
5 changed files with 369 additions and 4 deletions
--- a/gen-emoji.py
+++ b/gen-emoji.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
+
+import os
+from collections import defaultdict
+from functools import partial
+from itertools import groupby
+from operator import itemgetter
+from urllib.request import urlopen
+
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+raw = urlopen('http://unicode.org/Public/emoji/5.0/emoji-data.txt').read().decode('utf-8')
+seen = set()
+cmap = defaultdict(set)
+for line in raw.splitlines():
+    line = line.strip()
+    if not line or line.startswith('#'):
+        continue
+    spec, rest = line.partition(';')[::2]
+    spec, rest = spec.strip(), rest.strip().split(' ', 1)[0].strip()
+    if '.' in spec:
+        spec = tuple(map(lambda x: int(x, 16), filter(None, spec.split('.'))))
+        spec = set(range(spec[0], spec[1] + 1))
+    else:
+        spec = {int(spec, 16)}
+    cmap[rest] |= spec
+    seen |= spec
+items = list(seen)
+
+
+def get_ranges(items):
+    items.sort()
+    for k, g in groupby(enumerate(items), lambda m: m[0]-m[1]):
+        group = tuple(map(itemgetter(1), g))
+        a, b = group[0], group[-1]
+        if a == b:
+            yield a
+        else:
+            yield a, b
+
+
+def write_case(spec, p):
+    if isinstance(spec, tuple):
+        p('\t\tcase 0x{:x} ... 0x{:x}:'.format(*spec))
+    else:
+        p('\t\tcase 0x{:x}:'.format(spec))
+
+
+with open('kitty/emoji.h', 'w') as f:
+    p = partial(print, file=f)
+    p('#pragma once')
+    p('#include "data-types.h"\n')
+    p('START_ALLOW_CASE_RANGE')
+    p('static inline bool is_emoji(uint32_t code) {')
+    p('\tswitch(code) {')
+    for spec in get_ranges(items):
+        last = spec[1] if isinstance(spec, tuple) else spec
+        if last < 0x231a:
+            continue
+        write_case(spec, p)
+        p('\t\t\treturn true;')
+    p('\t\tdefault: return false;')
+    p('\t}')
+    p('\treturn false; \n}')
+    p('static inline bool is_emoji_modifier(uint32_t code) {')
+    p('\tswitch(code) {')
+    for spec in get_ranges(list(cmap['Emoji_Modifier'])):
+        write_case(spec, p)
+        p('\t\t\treturn true;')
+    p('\t\tdefault: return false;')
+    p('\t}')
+    p('\treturn false; \n}')
+    p('END_ALLOW_CASE_RANGE')