forked from ethereum/serpent
/
serpent.py
159 lines (126 loc) · 4.2 KB
/
serpent.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
import serpent_pyext as pyext
import sys
VERSION = '1.5.4'
class Metadata(object):
def __init__(self, li):
self.file = li[0]
self.ln = li[1]
self.ch = li[2]
def out(self):
return [self.file, self.ln, self.ch]
class Token(object):
def __init__(self, val, metadata):
self.val = val
self.metadata = Metadata(metadata)
def out(self):
return [0, self.val, self.metadata.out()]
def __repr__(self):
return str(self.val)
class Astnode(object):
def __init__(self, val, args, metadata):
self.val = val
self.args = map(node, args)
self.metadata = Metadata(metadata)
def out(self):
o = [1, self.val, self.metadata.out()]+[x.out() for x in self.args]
return o
def __repr__(self):
o = '(' + self.val
subs = map(repr, self.args)
k = 0
out = " "
while k < len(subs) and o != "(seq":
if '\n' in subs[k] or len(out + subs[k]) >= 80:
break
out += subs[k] + " "
k += 1
if k < len(subs):
o += out + "\n"
o += '\n '.join('\n'.join(subs[k:]).split('\n'))
o += '\n)'
else:
o += out[:-1] + ')'
return o
def node(li):
if li[0]:
return Astnode(li[1], li[3:], li[2])
else:
return Token(li[1], li[2])
def take(x):
return pyext.parse_lll(x) if isinstance(x, (str, unicode)) else x.out()
def takelist(x):
return map(take, parse(x).args if isinstance(x, (str, unicode)) else x)
compile = lambda x: pyext.compile(x)
compile_to_lll = lambda x: node(pyext.compile_to_lll(x))
compile_lll = lambda x: pyext.compile_lll(take(x))
parse = lambda x: node(pyext.parse(x))
rewrite = lambda x: node(pyext.rewrite(take(x)))
pretty_compile = lambda x: map(node, pyext.pretty_compile(x))
pretty_compile_lll = lambda x: map(node, pyext.pretty_compile_lll(take(x)))
serialize = lambda x: pyext.serialize(takelist(x))
deserialize = lambda x: map(node, pyext.deserialize(x))
is_numeric = lambda x: isinstance(x, (int, long))
is_string = lambda x: isinstance(x, (str, unicode))
tobytearr = lambda n, L: [] if L == 0 else tobytearr(n / 256, L - 1)+[n % 256]
# A set of methods for detecting raw values (numbers and strings) and
# converting them to integers
def frombytes(b):
return 0 if len(b) == 0 else ord(b[-1]) + 256 * frombytes(b[:-1])
def fromhex(b):
hexord = lambda x: '0123456789abcdef'.find(x)
return 0 if len(b) == 0 else hexord(b[-1]) + 16 * fromhex(b[:-1])
def numberize(b):
if is_numeric(b):
return b
elif b[0] in ["'", '"']:
return frombytes(b[1:-1])
elif b[:2] == '0x':
return fromhex(b[2:])
else:
return int(b)
def encode_datalist(vals):
def enc(n):
if is_numeric(n):
return ''.join(map(chr, tobytearr(n, 32)))
elif is_string(n) and len(n) == 40:
return '\x00' * 12 + n.decode('hex')
elif is_string(n):
return '\x00' * (32 - len(n)) + n
elif n is True:
return 1
elif n is False or n is None:
return 0
if isinstance(vals, (tuple, list)):
return ''.join(map(enc, vals))
elif vals == '':
return ''
else:
# Assume you're getting in numbers or 0x...
return ''.join(map(enc, map(numberize, vals.split(' '))))
def decode_datalist(arr):
if isinstance(arr, list):
arr = ''.join(map(chr, arr))
o = []
for i in range(0, len(arr), 32):
o.append(frombytes(arr[i:i + 32]))
return o
def main():
if len(sys.argv) == 1:
print "serpent <command> <arg1> <arg2> ..."
else:
cmd = sys.argv[2] if sys.argv[1] == '-2' else sys.argv[1]
if sys.argv[1] == '-s':
args = [sys.stdin.read()] + sys.argv[3:]
if cmd == 'deserialize':
args[0] = args[0].strip().decode('hex')
elif sys.argv[1] == '-v':
print VERSION
sys.exit()
else:
cmd = sys.argv[1]
args = sys.argv[2:]
o = globals()[cmd](*args)
if isinstance(o, (Token, Astnode, list)):
print repr(o)
else:
print o.encode('hex')