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Special-case empty { ... } sequences for prettier name mangling. #104

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Special-case empty { ... } sequences for prettier name mangling. #104

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8479549
Special-case empty `{ ... }` sequences for prettier name mangling.
sunfishcode Sep 12, 2022
4fd13dd
Don't check the len of a generator.
sunfishcode Sep 12, 2022
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35 changes: 25 additions & 10 deletions design/mvp/canonical-abi/definitions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1144,27 +1144,42 @@ def mangle_valtype(t):
case Result(ok,error) : return mangle_resulttype(ok,error)

def mangle_recordtype(fields):
mangled_fields = (f.label + ': ' + mangle_valtype(f.t) for f in fields)
return 'record { ' + ', '.join(mangled_fields) + ' }'
if len(fields) == 0:
return 'record {}'
else:
mangled_fields = (f.label + ': ' + mangle_valtype(f.t) for f in fields)
return 'record { ' + ', '.join(mangled_fields) + ' }'

def mangle_tupletype(ts):
return 'tuple<' + ', '.join(mangle_valtype(t) for t in ts) + '>'

def mangle_flags(labels):
return 'flags { ' + ', '.join(labels) + ' }'
if len(labels) == 0:
return 'flags {}'
else:
return 'flags { ' + ', '.join(labels) + ' }'

def mangle_varianttype(cases):
mangled_cases = ('{label}{payload}'.format(
label = c.label,
payload = '' if c.t is None else '(' + mangle_valtype(c.t) + ')')
for c in cases)
return 'variant { ' + ', '.join(mangled_cases) + ' }'
if len(cases) == 0:
return 'variant {}'
else:
mangled_cases = ('{label}{payload}'.format(
label = c.label,
payload = '' if c.t is None else '(' + mangle_valtype(c.t) + ')')
for c in cases)
return 'variant { ' + ', '.join(mangled_cases) + ' }'

def mangle_enumtype(labels):
return 'enum { ' + ', '.join(labels) + ' }'
if len(labels) == 0:
return 'enum {}'
else:
return 'enum { ' + ', '.join(labels) + ' }'

def mangle_uniontype(ts):
return 'union { ' + ', '.join(mangle_valtype(t) for t in ts) + ' }'
if len(ts) == 0:
return 'union {}'
else:
return 'union { ' + ', '.join(mangle_valtype(t) for t in ts) + ' }'

def mangle_optiontype(t):
return 'option<' + mangle_valtype(t) + '>'
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