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util.py
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util.py
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# Utility functions
str short_type(object obj):
"""Return the last component of the type name of an object. If obj is None,
return 'nil'. For example, if obj is 1, return 'int'.
"""
if obj is None:
return 'nil'
t = str(type(obj))
return t.split('.')[-1].rstrip("'>")
str indent(str s, int n):
"""Indent all the lines in s (separated by Newlines) by n spaces."""
s = ' ' * n + s
s = s.replace('\n', '\n' + ' ' * n)
return s
str[] array_repr<T>(T[] a):
"""Return the items of an array converted to strings using Repr."""
str[] aa = []
for x in a:
aa.append(repr(x))
return aa
str dump_tagged(any[] nodes, str tag):
"""Convert an array into a pretty-printed multiline string representation.
The format is
tag(
item1..
itemN)
Individual items are formatted like this:
- arrays are flattened
- pairs (str : array) are converted recursively, so that str is the tag
- other items are converted to strings and indented
"""
a = <str> []
if tag:
a.append(tag + '(')
for n in nodes:
if isinstance(n, list):
a.append(dump_tagged(n, None))
elif isinstance(n, tuple):
s = dump_tagged(n[1], n[0])
a.append(indent(s, 2))
elif n:
a.append(indent(str(n), 2))
if tag:
a[-1] += ')'
return '\n'.join(a)