41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
from type_def import *
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from inference import *
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types = {
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'int32': PrimitiveType('int32'),
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'int64': PrimitiveType('int64'),
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'str': PrimitiveType('str'),
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}
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variables = {
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'X': TypeVariable('X', []),
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'Y': TypeVariable('Y', []),
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'I': TypeVariable('I', [types['int32'], types['int64']]),
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'A': TypeVariable('A', [types['int32'], types['int64'], types['str']]),
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}
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def stringify_subst(subst):
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if isinstance(subst, str):
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return subst
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elements = [f"{key}: {str(value)}" for key, value in subst.items()]
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return "{" + ', '.join(elements) + "}"
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def try_case(a, b, ctx):
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result = find_subst(ctx, {}, a, b)
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print(f"{a} <- {b} w.r.t. {stringify_subst(ctx)}\n {stringify_subst(result)}\n")
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try_case(types['int32'], types['int32'], {})
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try_case(types['int32'], types['int64'], {})
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try_case(types['int32'], variables['X'], {})
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try_case(types['int32'], variables['X'], {'X': types['int32']})
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try_case(types['int32'], variables['X'], {'X': types['int64']})
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try_case(variables['X'], variables['X'], {'X': types['int64']})
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try_case(variables['X'], variables['Y'], {'Y': types['int64']})
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try_case(variables['X'], variables['Y'], {'X': types['int64']})
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try_case(variables['I'], variables['X'], {})
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try_case(variables['I'], variables['A'], {})
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try_case(variables['A'], variables['I'], {})
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try_case(variables['X'], variables['I'], {})
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