def write(sexp, out=sys.stdout):
"""Write an S-expression to a file"""
if isinstance(sexp, Sym):
out.write(sexp)
elif isinstance(sexp, basestring):
out.write('"' + quote(sexp) + '"')
elif isinstance(sexp, bool):
if sexp:
out.write("#t")
else:
out.write("#f")
elif isinstance(sexp, (int, float)):
out.write(repr(sexp))
elif hasattr(sexp, "__iter__"):
# write list
out.write("(")
size = len(sexp)
it = iter(sexp)
try:
a = it.next()
while True:
write(a, out)
a = it.next()
out.write(" ")
except StopIteration:
pass
out.write(")")
else:
raise Exception("item with unknown type in sexp '%s'" % repr(sexp))
def write_pretty(sexp, out=sys.stdout,
_prefix=0, _first=True):
"""Write an S-expression to a file"""
if _first:
out.write(" " * _prefix)
if isinstance(sexp, Sym):
out.write(sexp)
return len(sexp)
elif isinstance(sexp, basestring):
s = '"' + quote(sexp) + '"'
out.write(s)
return len(s)
elif isinstance(sexp, bool):
if sexp:
out.write("#t")
else:
out.write("#f")
return 2
elif isinstance(sexp, (int, float)):
s = repr(sexp)
out.write(s)
return len(s)
elif hasattr(sexp, "__iter__"):
# write list
i = 0
out.write("(")
size = 1
size2 = 0
it = iter(sexp)
_prefix += 1
try:
a = it.next()
while True:
if i < 1:
sexp_size = write_pretty(a, out,
_prefix=_prefix, _first=False)
i += 1
size += sexp_size
_prefix += sexp_size
a = it.next()
out.write(" ")
size += 1
_prefix += 1
else:
size2 = write_pretty(a, out,
_prefix=_prefix, _first=(i >= 2))
i += 1
a = it.next()
out.write("\n")
except StopIteration:
pass
out.write(")")
return size + size2 + 1
else:
raise Exception("item with unknown type in sexp '%s'" % repr(sexp))