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convert.py
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convert.py
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import math
import warnings
from vyper import ast
from vyper.exceptions import (
InvalidLiteralException,
ParserException,
TypeMismatchException,
)
from vyper.functions.signatures import (
signature,
)
from vyper.parser.parser_utils import (
LLLnode,
byte_array_to_num,
getpos,
)
from vyper.types import (
BaseType,
ByteArrayType,
StringType,
get_type,
)
from vyper.utils import (
DECIMAL_DIVISOR,
MemoryPositions,
SizeLimits,
)
@signature(('decimal', 'int128', 'uint256', 'address', 'bytes32', 'bytes'), '*')
def to_bool(expr, args, kwargs, context):
in_arg = args[0]
input_type, _ = get_type(in_arg)
if input_type == 'bytes':
if in_arg.typ.maxlen > 32:
raise TypeMismatchException(
f"Cannot convert bytes array of max length {in_arg.value} to bool",
expr,
)
else:
num = byte_array_to_num(in_arg, expr, 'uint256')
return LLLnode.from_list(
['iszero', ['iszero', num]],
typ=BaseType('bool'),
pos=getpos(expr)
)
else:
return LLLnode.from_list(
['iszero', ['iszero', in_arg]],
typ=BaseType('bool', in_arg.typ.unit),
pos=getpos(expr)
)
@signature(('num_literal', 'bool', 'decimal', 'uint256', 'address',
'bytes32', 'bytes', 'string'), '*')
def to_int128(expr, args, kwargs, context):
in_arg = args[0]
input_type, _ = get_type(in_arg)
_unit = in_arg.typ.unit if input_type in ('uint256', 'decimal') else None
if input_type == 'num_literal':
if isinstance(in_arg, int):
if not SizeLimits.in_bounds('int128', in_arg):
raise InvalidLiteralException(f"Number out of range: {in_arg}")
return LLLnode.from_list(
in_arg,
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
elif isinstance(in_arg, float):
if not SizeLimits.in_bounds('int128', math.trunc(in_arg)):
raise InvalidLiteralException(f"Number out of range: {math.trunc(in_arg)}")
return LLLnode.from_list(
math.trunc(in_arg),
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
else:
raise InvalidLiteralException(f"Unknown numeric literal type: {in_arg}")
elif input_type == 'bytes32':
if in_arg.typ.is_literal:
if not SizeLimits.in_bounds('int128', in_arg.value):
raise InvalidLiteralException(f"Number out of range: {in_arg.value}", expr)
else:
return LLLnode.from_list(
in_arg,
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
else:
return LLLnode.from_list(
[
'clamp',
['mload', MemoryPositions.MINNUM],
in_arg,
['mload', MemoryPositions.MAXNUM],
],
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
elif input_type == 'address':
return LLLnode.from_list(
[
'signextend',
15,
[
'and',
in_arg,
(SizeLimits.ADDRSIZE - 1)
],
],
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
elif input_type in ('string', 'bytes'):
if in_arg.typ.maxlen > 32:
raise TypeMismatchException(
f"Cannot convert bytes array of max length {in_arg.value} to int128",
expr,
)
return byte_array_to_num(in_arg, expr, 'int128')
elif input_type == 'uint256':
if in_arg.typ.is_literal:
if not SizeLimits.in_bounds('int128', in_arg.value):
raise InvalidLiteralException(f"Number out of range: {in_arg.value}", expr)
else:
return LLLnode.from_list(
in_arg,
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
else:
return LLLnode.from_list(
['uclample', in_arg, ['mload', MemoryPositions.MAXNUM]],
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
elif input_type == 'decimal':
return LLLnode.from_list(
[
'clamp',
['mload', MemoryPositions.MINNUM],
['sdiv', in_arg, DECIMAL_DIVISOR],
['mload', MemoryPositions.MAXNUM],
],
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
elif input_type == 'bool':
return LLLnode.from_list(
in_arg,
typ=BaseType('int128', _unit),
pos=getpos(expr)
)
else:
raise InvalidLiteralException(f"Invalid input for int128: {in_arg}", expr)
@signature(('num_literal', 'int128', 'bytes32', 'bytes', 'address', 'bool', 'decimal'), '*')
def to_uint256(expr, args, kwargs, context):
in_arg = args[0]
input_type, _ = get_type(in_arg)
_unit = in_arg.typ.unit if input_type in ('int128', 'decimal') else None
if input_type == 'num_literal':
if isinstance(in_arg, int):
if not SizeLimits.in_bounds('uint256', in_arg):
raise InvalidLiteralException(f"Number out of range: {in_arg}")
return LLLnode.from_list(
in_arg,
typ=BaseType('uint256', _unit),
pos=getpos(expr)
)
elif isinstance(in_arg, float):
if not SizeLimits.in_bounds('uint256', math.trunc(in_arg)):
raise InvalidLiteralException(f"Number out of range: {math.trunc(in_arg)}")
return LLLnode.from_list(
math.trunc(in_arg),
typ=BaseType('uint256', _unit),
pos=getpos(expr)
)
else:
raise InvalidLiteralException(f"Unknown numeric literal type: {in_arg}")
elif isinstance(in_arg, LLLnode) and input_type == 'int128':
return LLLnode.from_list(
['clampge', in_arg, 0],
typ=BaseType('uint256', _unit),
pos=getpos(expr)
)
elif isinstance(in_arg, LLLnode) and input_type == 'decimal':
return LLLnode.from_list(
['div', ['clampge', in_arg, 0], DECIMAL_DIVISOR],
typ=BaseType('uint256', _unit),
pos=getpos(expr)
)
elif isinstance(in_arg, LLLnode) and input_type == 'bool':
return LLLnode.from_list(
in_arg,
typ=BaseType('uint256'),
pos=getpos(expr)
)
elif isinstance(in_arg, LLLnode) and input_type in ('bytes32', 'address'):
return LLLnode(
value=in_arg.value,
args=in_arg.args,
typ=BaseType('uint256'),
pos=getpos(expr)
)
elif isinstance(in_arg, LLLnode) and input_type == 'bytes':
if in_arg.typ.maxlen > 32:
raise InvalidLiteralException(
f"Cannot convert bytes array of max length {in_arg.value} to uint256",
expr,
)
return byte_array_to_num(in_arg, expr, 'uint256')
else:
raise InvalidLiteralException(f"Invalid input for uint256: {in_arg}", expr)
@signature(('bool', 'int128', 'uint256', 'bytes32', 'bytes', 'address'), '*')
def to_decimal(expr, args, kwargs, context):
in_arg = args[0]
input_type, _ = get_type(in_arg)
if input_type == 'bytes':
if in_arg.typ.maxlen > 32:
raise TypeMismatchException(
f"Cannot convert bytes array of max length {in_arg.value} to decimal",
expr,
)
num = byte_array_to_num(in_arg, expr, 'int128')
return LLLnode.from_list(
['mul', num, DECIMAL_DIVISOR],
typ=BaseType('decimal'),
pos=getpos(expr)
)
else:
_unit = in_arg.typ.unit
_positional = in_arg.typ.positional
if input_type == 'uint256':
if in_arg.typ.is_literal:
if not SizeLimits.in_bounds('int128', (in_arg.value * DECIMAL_DIVISOR)):
raise InvalidLiteralException(
f"Number out of range: {in_arg.value}",
expr,
)
else:
return LLLnode.from_list(
['mul', in_arg, DECIMAL_DIVISOR],
typ=BaseType('decimal', _unit, _positional),
pos=getpos(expr)
)
else:
return LLLnode.from_list(
[
'uclample',
['mul', in_arg, DECIMAL_DIVISOR],
['mload', MemoryPositions.MAXDECIMAL]
],
typ=BaseType('decimal', _unit, _positional),
pos=getpos(expr)
)
elif input_type == 'address':
return LLLnode.from_list(
[
'mul',
[
'signextend',
15,
[
'and',
in_arg,
(SizeLimits.ADDRSIZE - 1)
],
],
DECIMAL_DIVISOR
],
typ=BaseType('decimal', _unit, _positional),
pos=getpos(expr)
)
elif input_type == 'bytes32':
if in_arg.typ.is_literal:
if not SizeLimits.in_bounds('int128', (in_arg.value * DECIMAL_DIVISOR)):
raise InvalidLiteralException(
f"Number out of range: {in_arg.value}",
expr,
)
else:
return LLLnode.from_list(
['mul', in_arg, DECIMAL_DIVISOR],
typ=BaseType('decimal', _unit, _positional),
pos=getpos(expr)
)
else:
return LLLnode.from_list(
[
'clamp',
['mload', MemoryPositions.MINDECIMAL],
['mul', in_arg, DECIMAL_DIVISOR],
['mload', MemoryPositions.MAXDECIMAL],
],
typ=BaseType('decimal', _unit, _positional),
pos=getpos(expr)
)
elif input_type in ('int128', 'bool'):
return LLLnode.from_list(
['mul', in_arg, DECIMAL_DIVISOR],
typ=BaseType('decimal', _unit, _positional),
pos=getpos(expr)
)
else:
raise InvalidLiteralException(f"Invalid input for decimal: {in_arg}", expr)
@signature(('int128', 'uint256', 'address', 'bytes', 'bool', 'decimal'), '*')
def to_bytes32(expr, args, kwargs, context):
in_arg = args[0]
input_type, _len = get_type(in_arg)
if input_type == 'bytes':
if _len > 32:
raise TypeMismatchException(
f"Unable to convert bytes[{_len}] to bytes32, max length is too "
"large."
)
if in_arg.location == "memory":
return LLLnode.from_list(
['mload', ['add', in_arg, 32]],
typ=BaseType('bytes32')
)
elif in_arg.location == "storage":
return LLLnode.from_list(
['sload', ['add', ['sha3_32', in_arg], 1]],
typ=BaseType('bytes32')
)
else:
return LLLnode(
value=in_arg.value,
args=in_arg.args,
typ=BaseType('bytes32'),
pos=getpos(expr)
)
@signature(('bytes32'), '*')
def to_address(expr, args, kwargs, context):
in_arg = args[0]
return LLLnode(
value=in_arg.value,
args=in_arg.args,
typ=BaseType('address'),
pos=getpos(expr)
)
def _to_bytelike(expr, args, kwargs, context, bytetype):
if bytetype == 'string':
ReturnType = StringType
elif bytetype == 'bytes':
ReturnType = ByteArrayType
else:
raise TypeMismatchException(f'Invalid {bytetype} supplied')
in_arg = args[0]
if in_arg.typ.maxlen > args[1].slice.value.n:
raise TypeMismatchException(
f'Cannot convert as input {bytetype} are larger than max length',
expr,
)
return LLLnode(
value=in_arg.value,
args=in_arg.args,
typ=ReturnType(in_arg.typ.maxlen),
pos=getpos(expr),
location=in_arg.location
)
@signature(('bytes'), '*')
def to_string(expr, args, kwargs, context):
return _to_bytelike(expr, args, kwargs, context, bytetype='string')
@signature(('string'), '*')
def to_bytes(expr, args, kwargs, context):
return _to_bytelike(expr, args, kwargs, context, bytetype='bytes')
def convert(expr, context):
if len(expr.args) != 2:
raise ParserException('The convert function expects two parameters.', expr)
if isinstance(expr.args[1], ast.Str):
warnings.warn(
"String parameter has been removed (see VIP1026). "
"Use a vyper type instead.",
DeprecationWarning
)
if isinstance(expr.args[1], ast.Name):
output_type = expr.args[1].id
elif isinstance(expr.args[1], (ast.Subscript)) and isinstance(expr.args[1].value, (ast.Name)):
output_type = expr.args[1].value.id
else:
raise ParserException("Invalid conversion type, use valid Vyper type.", expr)
if output_type in CONVERSION_TABLE:
return CONVERSION_TABLE[output_type](expr, context)
else:
raise ParserException(f"Conversion to {output_type} is invalid.", expr)
CONVERSION_TABLE = {
'bool': to_bool,
'int128': to_int128,
'uint256': to_uint256,
'decimal': to_decimal,
'bytes32': to_bytes32,
'address': to_address,
'string': to_string,
'bytes': to_bytes
}