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Added support for longer ligatures

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- Breaking out the ligature substitution rules like this also allows for
 easy logical extensions, to handle edge cases as FiraCode does.
This commit is contained in:
John Mager 2020-06-20 19:36:55 -04:00
parent f26bc2f418
commit 824cd6a9f8
1 changed files with 35 additions and 30 deletions
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65
Scripts/features.py
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@ -44,36 +44,41 @@ def rule(liga):
[LIG f i] LIG [LIG f i] LIG
[ f f i] LIG } [ f f i] LIG }
""" """
if len(liga) == 2: # ignores:
return dedent('''\ # ignore sub {0} {0}' {1};
lookup {0}_{1} {{ # ignore sub {0}' {1} {1};
ignore sub {0} {0}' {1}; rules = [
ignore sub {0}' {1} {1}; ignore(prefix=liga[:1], head=liga[0], suffix=liga[1:]),
sub {0}' {1} by LIG; ignore(head=liga[0], suffix=(liga[1:] + [liga[-1]])),
sub LIG {1}' by {0}_{1}.liga; ]
}} {0}_{1};
''').format(*liga) name = "_".join(liga)
elif len(liga) == 3: # substitution logic
return dedent('''\ # sub {0}' {1} by LIG;
lookup {0}_{1}_{2} {{ # sub LIG {1}' by {0}_{1}.liga;
ignore sub {0} {0}' {1} {2}; for i in range(len(liga)):
ignore sub {0}' {1} {2} {2}; init = _join(["LIG" for lig in liga[:i]])
sub {0}' {1} {2} by LIG; tail = _join(liga[i + 1 :])
sub LIG {1}' {2} by LIG; replace = "LIG" if (i + 1 < len(liga)) else (name + ".liga")
sub LIG LIG {2}' by {0}_{1}_{2}.liga; rules.append("sub{0} {1}'{2} by {3};".format(init, liga[i], tail, replace))
}} {0}_{1}_{2};
''').format(*liga) # put it all together
elif len(liga) == 4: lines = (
return dedent('''\ ["lookup " + name + " {"] + [" " + r for r in rules] + ["}} {0};".format(name)]
lookup {0}_{1}_{2}_{3} {{ )
ignore sub {0} {0}' {1} {2} {3}; return "\n".join(lines)
ignore sub {0}' {1} {2} {3} {3};
sub {0}' {1} {2} {3} by LIG;
sub LIG {1}' {2} {3} by LIG; def _join(items):
sub LIG LIG {2}' {3} by LIG; return (" " + " ".join(items)) if items else ""
sub LIG LIG LIG {3}' by {0}_{1}_{2}_{3}.liga;
}} {0}_{1}_{2}_{3};
''').format(*liga) 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)
def indent(text, prefix): def indent(text, prefix):