mirror of
https://github.com/belluzj/fantasque-sans.git
synced 2024-11-05 08:51:32 +01:00
240 lines
8.1 KiB
Python
240 lines
8.1 KiB
Python
# Generate features for ligatures
|
|
#
|
|
# Adapted from https://github.com/tonsky/FiraCode/blob/master/gen_calt.clj
|
|
|
|
from __future__ import unicode_literals
|
|
|
|
from textwrap import dedent
|
|
from collections import defaultdict
|
|
import tempfile
|
|
|
|
|
|
def update_features(font):
|
|
"""Find ligatures in the font and generate features for them."""
|
|
# [ ["dash" "greater" "greater"] ... ]
|
|
ligas = [name[:-len('.liga')].split('_')
|
|
for name in font if name.endswith('.liga') and
|
|
font[name].isWorthOutputting()]
|
|
|
|
rules = '\n\n'.join(rule(liga)
|
|
for liga in sorted(ligas, key=lambda l: -len(l)))
|
|
|
|
fea_code = dedent('''\
|
|
languagesystem DFLT dflt;
|
|
languagesystem latn dflt;
|
|
languagesystem grek dflt;
|
|
languagesystem cyrl dflt;
|
|
|
|
feature calt {{
|
|
{}
|
|
}} calt;
|
|
''').format(indent(rules, ' '))
|
|
|
|
# print(fea_code) # DEBUG
|
|
|
|
# Add the dummy "LIG" glyph
|
|
lig = font.createChar(-1, 'LIG')
|
|
lig.width = font['space'].width
|
|
with tempfile.NamedTemporaryFile(mode='w', suffix='.fea') as f:
|
|
f.write(fea_code)
|
|
f.seek(0)
|
|
font.mergeFeature(f.name)
|
|
|
|
|
|
def rule(liga):
|
|
"""
|
|
[f f i] => { [LIG LIG i] f_f_i.liga
|
|
[LIG f i] LIG
|
|
[ f f i] LIG }
|
|
"""
|
|
rules = []
|
|
# standard ignores:
|
|
# ignore sub {0} {0}' {1};
|
|
# ignore sub {0}' {1} {1};
|
|
if tuple(liga) not in skip_ignores:
|
|
rules.extend(
|
|
[
|
|
ignore(prefix=liga[:1], head=liga[0], suffix=liga[1:]),
|
|
ignore(head=liga[0], suffix=(liga[1:] + [liga[-1]])),
|
|
]
|
|
)
|
|
|
|
# careful with repeats:
|
|
# #133 ->->->->, /**/**/**/, etc.
|
|
if len(liga) > 2 and liga[0] == liga[-1]:
|
|
rules.append(ignore([liga[-2]], liga[0], liga[1:]))
|
|
rules.append(ignore(head=liga[0], suffix=(liga[1:] + [liga[1]])))
|
|
|
|
# Don't cut into `prefix` to complete a ligature.
|
|
# i.e. regex `(?=`> is not `(?`=>.
|
|
rules.extend(
|
|
[
|
|
ignore(prefix[:-n], liga[0], liga[1:])
|
|
for prefix in ignore_prefixes
|
|
for n in range(1, len(liga))
|
|
if prefix[-n:] == liga[:n]
|
|
]
|
|
)
|
|
# hardcoded ignores, i.e. `<||>`
|
|
rules.extend(ignores[tuple(liga)])
|
|
|
|
name = "_".join(liga)
|
|
# substitution logic
|
|
# sub {0}' {1} by LIG;
|
|
# sub LIG {1}' by {0}_{1}.liga;
|
|
for i in range(len(liga)):
|
|
init = _join(["LIG" for lig in liga[:i]])
|
|
tail = _join(liga[i + 1 :])
|
|
replace = "LIG" if (i + 1 < len(liga)) else (name + ".liga")
|
|
rules.append("sub{0} {1}'{2} by {3};".format(init, liga[i], tail, replace))
|
|
|
|
# put it all together
|
|
lines = (
|
|
["lookup " + name + " {"] + [" " + r for r in rules] + ["}} {0};".format(name)]
|
|
)
|
|
return "\n".join(lines)
|
|
|
|
|
|
def _join(items):
|
|
return (" " + " ".join(items)) if items else ""
|
|
|
|
|
|
def ignore(prefix=None, head=None, suffix=None):
|
|
""" don't substitute `head` if it's surrounded by `prefix` and `suffix` """
|
|
assert head
|
|
pref = _join(prefix)
|
|
rest = _join(suffix)
|
|
return "ignore sub{0} {1}'{2};".format(pref, head, rest)
|
|
|
|
|
|
ignores = defaultdict(
|
|
list,
|
|
{
|
|
("slash", "asterisk"): [
|
|
"ignore sub slash' asterisk slash;",
|
|
"ignore sub asterisk slash' asterisk;",
|
|
],
|
|
("asterisk", "slash"): [
|
|
"ignore sub slash asterisk' slash;",
|
|
"ignore sub asterisk' slash asterisk;",
|
|
],
|
|
# ("asterisk", "asterisk"): [
|
|
# "ignore sub slash asterisk' asterisk;",
|
|
# "ignore sub asterisk' asterisk slash;",
|
|
# ],
|
|
# ("asterisk", "asterisk", "asterisk"): [
|
|
# "ignore sub slash asterisk' asterisk asterisk;",
|
|
# "ignore sub asterisk' asterisk asterisk slash;",
|
|
# ],
|
|
# <||>
|
|
("less", "bar", "bar"): ["ignore sub less' bar bar greater;"],
|
|
("bar", "bar", "greater"): ["ignore sub less bar' bar greater;"],
|
|
# # :>=
|
|
# ("colon", "greater"): ["ignore sub colon' greater equal;"],
|
|
# # {|}
|
|
# ("braceleft", "bar"): ["ignore sub braceleft' bar braceright;"],
|
|
# ("bar", "braceright"): ["ignore sub braceleft bar' braceright;"],
|
|
# # [|]
|
|
# ("bracketleft", "bar"): ["ignore sub bracketleft' bar bracketright;"],
|
|
# ("bar", "bracketright"): ["ignore sub bracketleft bar' bracketright;"],
|
|
# # <*>>> <+>>> <$>>>
|
|
# ("greater", "greater", "greater"): [
|
|
# "ignore sub [asterisk plus dollar] greater' greater greater;"
|
|
# ],
|
|
# # <<<*> <<<+> <<<$>
|
|
# ("less", "less", "less"): ["ignore sub less' less less [asterisk plus dollar];"],
|
|
# # =:=
|
|
# ("colon", "equal"): ["ignore sub equal colon' equal;"],
|
|
# =!=
|
|
("exclam", "equal"): ["ignore sub equal exclam' equal;"],
|
|
# =!==
|
|
("exclam", "equal", "equal"): ["ignore sub equal exclam' equal equal;"],
|
|
# =<= <=< <=> <=| <=: <=! <=/
|
|
("less", "equal"): [
|
|
"ignore sub equal less' equal;",
|
|
"ignore sub less' equal [less greater bar colon exclam slash];",
|
|
],
|
|
# >=<
|
|
# =>= >=> >=< >=| >=: >=! >=/
|
|
("greater", "equal"): [
|
|
"ignore sub equal greater' equal;",
|
|
"ignore sub greater' equal [less greater bar colon exclam slash];",
|
|
],
|
|
# <*>> <+>> <$>>
|
|
# >>->> >>=>>
|
|
("greater", "greater"): [
|
|
# "ignore sub [asterisk plus dollar] greater' greater;",
|
|
# "ignore sub [hyphen equal] greater' greater;",
|
|
# "ignore sub greater' greater [hyphen equal];",
|
|
],
|
|
# <<*> <<+> <<$>
|
|
# <<-<< <<=<<
|
|
("less", "less"): [
|
|
# "ignore sub less' less [asterisk plus dollar];",
|
|
# "ignore sub [hyphen equal] less' less;",
|
|
# "ignore sub less' less [hyphen equal];",
|
|
],
|
|
# ||-|| ||=||
|
|
("bar", "bar"): [
|
|
"ignore sub [hyphen equal] bar' bar;",
|
|
"ignore sub bar' bar [hyphen equal];",
|
|
],
|
|
# # <--> >--< |--|
|
|
# ("hyphen", "hyphen"): [
|
|
# "ignore sub [less greater bar] hyphen' hyphen;",
|
|
# "ignore sub hyphen' hyphen [less greater bar];",
|
|
# ],
|
|
# # <---> >---< |---|
|
|
# ("hyphen", "hyphen", "hyphen"):
|
|
# "ignore sub [less greater bar] hyphen' hyphen hyphen;",
|
|
# "ignore sub hyphen' hyphen hyphen [less greater bar];",
|
|
# ],
|
|
("equal", "equal"): [ # ==
|
|
# "ignore sub bracketleft equal' equal;", # [==
|
|
# "ignore sub equal' equal bracketright;",# ==]
|
|
"ignore sub equal [colon exclam] equal' equal;", # =:== =!==
|
|
# "ignore sub [less greater bar slash] equal' equal;", # <== >== |== /==
|
|
# "ignore sub equal' equal [less greater bar slash];", # ==< ==> ==| ==/
|
|
"ignore sub equal' equal [colon exclam] equal;", # ==:= ==!=
|
|
],
|
|
# [===[ ]===]
|
|
# [=== ===]
|
|
# <===> >===< |===| /===/ =:=== =!=== ===:= ===!=
|
|
("equal", "equal", "equal"): [
|
|
# "ignore sub bracketleft equal' equal equal;",
|
|
# "ignore sub equal' equal equal bracketright;",
|
|
"ignore sub equal [colon exclam] equal' equal equal;",
|
|
"ignore sub [less greater bar slash] equal' equal equal;",
|
|
# "ignore sub equal' equal equal [less greater bar slash];",
|
|
"ignore sub equal' equal equal [colon exclam] equal;",
|
|
],
|
|
# #118 https://
|
|
("slash", "slash"): ["ignore sub colon slash' slash;"],
|
|
},
|
|
)
|
|
|
|
|
|
ignore_prefixes = [
|
|
["parenleft", "question", "colon"],
|
|
# Regexp lookahead/lookbehind
|
|
["parenleft", "question", "equal"],
|
|
["parenleft", "question", "less", "equal"],
|
|
["parenleft", "question", "exclam"],
|
|
["parenleft", "question", "less", "exclam"],
|
|
# PHP <?=
|
|
["less", "question", "equal"],
|
|
]
|
|
|
|
|
|
# DO NOT generate ignores at all
|
|
skip_ignores = {
|
|
# # <<*>> <<+>> <<$>>
|
|
# ("less", "asterisk", "greater"),
|
|
# ("less", "plus", "greater"),
|
|
# ("less", "dollar", "greater"),
|
|
}
|
|
|
|
|
|
def indent(text, prefix):
|
|
return '\n'.join(prefix + line for line in text.split('\n'))
|