transaction: replace custom enum type for opcodes with stdlib enum

based on Electron-Cash/Electron-Cash@99e60b49413e103dd8e9b7cfaf22e69626db6594

electrum/gui/qt/paytoedit.py

@@ -95,8 +95,7 @@ class PayToEdit(CompletionTextEdit, ScanQRTextEdit, PrintError):
         script = ''
         for word in x.split():
             if word[0:3] == 'OP_':
-                assert word in opcodes.lookup
+                opcode_int = opcodes[word]
-                opcode_int = opcodes.lookup[word]
                 assert opcode_int < 256  # opcode is single-byte
                 script += bitcoin.int_to_hex(opcode_int)
             else:

electrum/transaction.py

@@ -32,6 +32,7 @@ import traceback
 import sys
 from typing import (Sequence, Union, NamedTuple, Tuple, Optional, Iterable,
                     Callable, List, Dict)
+from enum import IntEnum
 
 from . import ecc, bitcoin, constants, segwit_addr
 from .util import print_error, profiler, to_bytes, bh2u, bfh
@@ -190,81 +191,146 @@ class BCDataStream(object):
         self.write(s)
 
 
-# enum-like type
+class opcodes(IntEnum):
-# From the Python Cookbook, downloaded from http://code.activestate.com/recipes/67107/
+    # push value
-class EnumException(Exception):
+    OP_0 = 0x00
-    pass
+    OP_FALSE = OP_0
-
+    OP_PUSHDATA1 = 0x4c
+    OP_PUSHDATA2 = 0x4d
+    OP_PUSHDATA4 = 0x4e
+    OP_1NEGATE = 0x4f
+    OP_RESERVED = 0x50
+    OP_1 = 0x51
+    OP_TRUE = OP_1
+    OP_2 = 0x52
+    OP_3 = 0x53
+    OP_4 = 0x54
+    OP_5 = 0x55
+    OP_6 = 0x56
+    OP_7 = 0x57
+    OP_8 = 0x58
+    OP_9 = 0x59
+    OP_10 = 0x5a
+    OP_11 = 0x5b
+    OP_12 = 0x5c
+    OP_13 = 0x5d
+    OP_14 = 0x5e
+    OP_15 = 0x5f
+    OP_16 = 0x60
+
+    # control
+    OP_NOP = 0x61
+    OP_VER = 0x62
+    OP_IF = 0x63
+    OP_NOTIF = 0x64
+    OP_VERIF = 0x65
+    OP_VERNOTIF = 0x66
+    OP_ELSE = 0x67
+    OP_ENDIF = 0x68
+    OP_VERIFY = 0x69
+    OP_RETURN = 0x6a
+
+    # stack ops
+    OP_TOALTSTACK = 0x6b
+    OP_FROMALTSTACK = 0x6c
+    OP_2DROP = 0x6d
+    OP_2DUP = 0x6e
+    OP_3DUP = 0x6f
+    OP_2OVER = 0x70
+    OP_2ROT = 0x71
+    OP_2SWAP = 0x72
+    OP_IFDUP = 0x73
+    OP_DEPTH = 0x74
+    OP_DROP = 0x75
+    OP_DUP = 0x76
+    OP_NIP = 0x77
+    OP_OVER = 0x78
+    OP_PICK = 0x79
+    OP_ROLL = 0x7a
+    OP_ROT = 0x7b
+    OP_SWAP = 0x7c
+    OP_TUCK = 0x7d
+
+    # splice ops
+    OP_CAT = 0x7e
+    OP_SUBSTR = 0x7f
+    OP_LEFT = 0x80
+    OP_RIGHT = 0x81
+    OP_SIZE = 0x82
+
+    # bit logic
+    OP_INVERT = 0x83
+    OP_AND = 0x84
+    OP_OR = 0x85
+    OP_XOR = 0x86
+    OP_EQUAL = 0x87
+    OP_EQUALVERIFY = 0x88
+    OP_RESERVED1 = 0x89
+    OP_RESERVED2 = 0x8a
+
+    # numeric
+    OP_1ADD = 0x8b
+    OP_1SUB = 0x8c
+    OP_2MUL = 0x8d
+    OP_2DIV = 0x8e
+    OP_NEGATE = 0x8f
+    OP_ABS = 0x90
+    OP_NOT = 0x91
+    OP_0NOTEQUAL = 0x92
+
+    OP_ADD = 0x93
+    OP_SUB = 0x94
+    OP_MUL = 0x95
+    OP_DIV = 0x96
+    OP_MOD = 0x97
+    OP_LSHIFT = 0x98
+    OP_RSHIFT = 0x99
+
+    OP_BOOLAND = 0x9a
+    OP_BOOLOR = 0x9b
+    OP_NUMEQUAL = 0x9c
+    OP_NUMEQUALVERIFY = 0x9d
+    OP_NUMNOTEQUAL = 0x9e
+    OP_LESSTHAN = 0x9f
+    OP_GREATERTHAN = 0xa0
+    OP_LESSTHANOREQUAL = 0xa1
+    OP_GREATERTHANOREQUAL = 0xa2
+    OP_MIN = 0xa3
+    OP_MAX = 0xa4
+
+    OP_WITHIN = 0xa5
+
+    # crypto
+    OP_RIPEMD160 = 0xa6
+    OP_SHA1 = 0xa7
+    OP_SHA256 = 0xa8
+    OP_HASH160 = 0xa9
+    OP_HASH256 = 0xaa
+    OP_CODESEPARATOR = 0xab
+    OP_CHECKSIG = 0xac
+    OP_CHECKSIGVERIFY = 0xad
+    OP_CHECKMULTISIG = 0xae
+    OP_CHECKMULTISIGVERIFY = 0xaf
+
+    # expansion
+    OP_NOP1 = 0xb0
+    OP_CHECKLOCKTIMEVERIFY = 0xb1
+    OP_NOP2 = OP_CHECKLOCKTIMEVERIFY
+    OP_CHECKSEQUENCEVERIFY = 0xb2
+    OP_NOP3 = OP_CHECKSEQUENCEVERIFY
+    OP_NOP4 = 0xb3
+    OP_NOP5 = 0xb4
+    OP_NOP6 = 0xb5
+    OP_NOP7 = 0xb6
+    OP_NOP8 = 0xb7
+    OP_NOP9 = 0xb8
+    OP_NOP10 = 0xb9
+
+    OP_INVALIDOPCODE = 0xff
+
+    def hex(self) -> str:
+        return bytes([self]).hex()
 
-class Enumeration:
-    def __init__(self, name, enumList):
-        self.__doc__ = name
-        lookup = { }
-        reverseLookup = { }
-        i = 0
-        uniqueNames = [ ]
-        uniqueValues = [ ]
-        for x in enumList:
-            if isinstance(x, tuple):
-                x, i = x
-            if not isinstance(x, str):
-                raise EnumException("enum name is not a string: " + x)
-            if not isinstance(i, int):
-                raise EnumException("enum value is not an integer: " + i)
-            if x in uniqueNames:
-                raise EnumException("enum name is not unique: " + x)
-            if i in uniqueValues:
-                raise EnumException("enum value is not unique for " + x)
-            uniqueNames.append(x)
-            uniqueValues.append(i)
-            lookup[x] = i
-            reverseLookup[i] = x
-            i = i + 1
-        self.lookup = lookup
-        self.reverseLookup = reverseLookup
-
-    def __getattr__(self, attr):
-        if attr not in self.lookup:
-            raise AttributeError
-        return self.lookup[attr]
-    def whatis(self, value):
-        return self.reverseLookup[value]
-
-
-# This function comes from bitcointools, bct-LICENSE.txt.
-def long_hex(bytes):
-    return bytes.encode('hex_codec')
-
-# This function comes from bitcointools, bct-LICENSE.txt.
-def short_hex(bytes):
-    t = bytes.encode('hex_codec')
-    if len(t) < 11:
-        return t
-    return t[0:4]+"..."+t[-4:]
-
-
-
-opcodes = Enumeration("Opcodes", [
-    ("OP_0", 0), ("OP_PUSHDATA1",76), "OP_PUSHDATA2", "OP_PUSHDATA4", "OP_1NEGATE", "OP_RESERVED",
-    "OP_1", "OP_2", "OP_3", "OP_4", "OP_5", "OP_6", "OP_7",
-    "OP_8", "OP_9", "OP_10", "OP_11", "OP_12", "OP_13", "OP_14", "OP_15", "OP_16",
-    "OP_NOP", "OP_VER", "OP_IF", "OP_NOTIF", "OP_VERIF", "OP_VERNOTIF", "OP_ELSE", "OP_ENDIF", "OP_VERIFY",
-    "OP_RETURN", "OP_TOALTSTACK", "OP_FROMALTSTACK", "OP_2DROP", "OP_2DUP", "OP_3DUP", "OP_2OVER", "OP_2ROT", "OP_2SWAP",
-    "OP_IFDUP", "OP_DEPTH", "OP_DROP", "OP_DUP", "OP_NIP", "OP_OVER", "OP_PICK", "OP_ROLL", "OP_ROT",
-    "OP_SWAP", "OP_TUCK", "OP_CAT", "OP_SUBSTR", "OP_LEFT", "OP_RIGHT", "OP_SIZE", "OP_INVERT", "OP_AND",
-    "OP_OR", "OP_XOR", "OP_EQUAL", "OP_EQUALVERIFY", "OP_RESERVED1", "OP_RESERVED2", "OP_1ADD", "OP_1SUB", "OP_2MUL",
-    "OP_2DIV", "OP_NEGATE", "OP_ABS", "OP_NOT", "OP_0NOTEQUAL", "OP_ADD", "OP_SUB", "OP_MUL", "OP_DIV",
-    "OP_MOD", "OP_LSHIFT", "OP_RSHIFT", "OP_BOOLAND", "OP_BOOLOR",
-    "OP_NUMEQUAL", "OP_NUMEQUALVERIFY", "OP_NUMNOTEQUAL", "OP_LESSTHAN",
-    "OP_GREATERTHAN", "OP_LESSTHANOREQUAL", "OP_GREATERTHANOREQUAL", "OP_MIN", "OP_MAX",
-    "OP_WITHIN", "OP_RIPEMD160", "OP_SHA1", "OP_SHA256", "OP_HASH160",
-    "OP_HASH256", "OP_CODESEPARATOR", "OP_CHECKSIG", "OP_CHECKSIGVERIFY", "OP_CHECKMULTISIG",
-    "OP_CHECKMULTISIGVERIFY",
-    ("OP_NOP1", 0xB0),
-    ("OP_CHECKLOCKTIMEVERIFY", 0xB1), ("OP_CHECKSEQUENCEVERIFY", 0xB2),
-    "OP_NOP4", "OP_NOP5", "OP_NOP6", "OP_NOP7", "OP_NOP8", "OP_NOP9", "OP_NOP10",
-    ("OP_INVALIDOPCODE", 0xFF),
-])
 
 
 def script_GetOp(_bytes : bytes):
@@ -294,10 +360,6 @@ def script_GetOp(_bytes : bytes):
         yield opcode, vch, i
 
 
-def script_GetOpName(opcode):
-    return (opcodes.whatis(opcode)).replace("OP_", "")
-
-
 class OPPushDataGeneric:
     def __init__(self, pushlen: Callable=None):
         if pushlen is not None: