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241 lines
7.0 KiB
Python
241 lines
7.0 KiB
Python
"""
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Programming Language for 6502/6510 microprocessors, codename 'Sick'
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Here are the data type definitions and -conversions.
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Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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"""
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import math
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import enum
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from typing import Tuple, Union
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from functools import total_ordering
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from .plylex import print_warning, SourceRef
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PrimitiveType = Union[int, float, str]
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@total_ordering
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class VarType(enum.Enum):
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CONST = 1
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MEMORY = 2
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VAR = 3
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def __lt__(self, other):
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if self.__class__ == other.__class__:
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return self.value < other.value
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return NotImplemented
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@total_ordering
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class DataType(enum.Enum):
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"""The possible data types of values"""
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BYTE = 1
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WORD = 2
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FLOAT = 3
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BYTEARRAY = 4
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WORDARRAY = 5
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MATRIX = 6
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STRING = 7
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STRING_P = 8
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STRING_S = 9
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STRING_PS = 10
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def __lt__(self, other):
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if self.__class__ == other.__class__:
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return self.value < other.value
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return NotImplemented
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STRING_DATATYPES = {DataType.STRING, DataType.STRING_P, DataType.STRING_S, DataType.STRING_PS}
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# 5-byte cbm MFLPT format limitations:
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FLOAT_MAX_POSITIVE = 1.7014118345e+38
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FLOAT_MAX_NEGATIVE = -1.7014118345e+38
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def to_hex(number: int) -> str:
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# 0..255 -> "$00".."$ff"
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# 256..65536 -> "$0100".."$ffff"
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if number is None:
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raise ValueError("number")
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if 0 <= number < 0x100:
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return "${:02x}".format(number)
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if 0 <= number < 0x10000:
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return "${:04x}".format(number)
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raise OverflowError(number)
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def to_mflpt5(number: float) -> bytearray:
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# algorithm here https://sourceforge.net/p/acme-crossass/code-0/62/tree/trunk/ACME_Lib/cbm/mflpt.a
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number = float(number)
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if number < FLOAT_MAX_NEGATIVE or number > FLOAT_MAX_POSITIVE:
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raise OverflowError("floating point number out of 5-byte mflpt range", number)
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if number == 0.0:
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return bytearray([0, 0, 0, 0, 0])
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if number < 0.0:
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sign = 0x80000000
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number = -number
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else:
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sign = 0x00000000
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mant, exp = math.frexp(number)
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exp += 128
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if exp < 1:
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# underflow, use zero instead
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return bytearray([0, 0, 0, 0, 0])
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if exp > 255:
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raise OverflowError("floating point number out of 5-byte mflpt range", number)
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mant = sign | int(mant * 0x100000000) & 0x7fffffff
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return bytearray([exp]) + int.to_bytes(mant, 4, "big")
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def mflpt5_to_float(mflpt: bytearray) -> float:
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# algorithm here https://sourceforge.net/p/acme-crossass/code-0/62/tree/trunk/ACME_Lib/cbm/mflpt.a
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if mflpt == bytearray([0, 0, 0, 0, 0]):
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return 0.0
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exp = mflpt[0] - 128
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sign = mflpt[1] & 0x80
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number = 0x80000000 | int.from_bytes(mflpt[1:], "big")
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number = float(number) * 2**exp / 0x100000000
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return -number if sign else number
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def coerce_value(datatype: DataType, value: PrimitiveType, sourceref: SourceRef=None) -> Tuple[bool, PrimitiveType]:
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# if we're a BYTE type, and the value is a single character, convert it to the numeric value
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def verify_bounds(value: PrimitiveType) -> None:
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# if the value is out of bounds, raise an overflow exception
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if datatype == DataType.BYTE and not (0 <= value <= 0xff): # type: ignore
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raise OverflowError("value out of range for byte")
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if datatype == DataType.WORD and not (0 <= value <= 0xffff): # type: ignore
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raise OverflowError("value out of range for word")
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if datatype == DataType.FLOAT and not (FLOAT_MAX_NEGATIVE <= value <= FLOAT_MAX_POSITIVE): # type: ignore
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raise OverflowError("value out of range for float")
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if datatype in (DataType.BYTE, DataType.BYTEARRAY, DataType.MATRIX) and isinstance(value, str):
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if len(value) == 1:
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return True, char_to_bytevalue(value)
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# if we're an integer value and the passed value is float, truncate it (and give a warning)
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if datatype in (DataType.BYTE, DataType.WORD, DataType.MATRIX) and isinstance(value, float):
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frac = math.modf(value)
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if frac != 0:
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print_warning("float value truncated ({} to datatype {})".format(value, datatype.name), sourceref=sourceref)
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value = int(value)
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verify_bounds(value)
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return True, value
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verify_bounds(value)
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return False, value
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def char_to_bytevalue(character: str, petscii: bool=True) -> int:
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assert len(character) == 1
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if petscii:
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return ord(character.translate(ascii_to_petscii_trans))
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else:
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raise NotImplementedError("screencode conversion not yet implemented for chars")
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# ASCII/UNICODE-to-PETSCII translation table
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# Unicode symbols supported that map to a PETSCII character: £ ↑ ← ♠ ♥ ♦ ♣ π ● ○ and various others
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ascii_to_petscii_trans = str.maketrans({
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'\f': 147, # form feed becomes ClearScreen "{clear}"
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'\n': 13, # line feed becomes a RETURN "{cr}" (not a line feed)
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'\r': 17, # CR becomes CursorDown "{down}"
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'a': 65,
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'b': 66,
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'c': 67,
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'd': 68,
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'e': 69,
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'f': 70,
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'g': 71,
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'h': 72,
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'i': 73,
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'j': 74,
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'k': 75,
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'l': 76,
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'm': 77,
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'n': 78,
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'o': 79,
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'p': 80,
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'q': 81,
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'r': 82,
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's': 83,
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't': 84,
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'u': 85,
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'v': 86,
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'w': 87,
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'x': 88,
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'y': 89,
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'z': 90,
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'A': 97,
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'B': 98,
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'C': 99,
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'D': 100,
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'E': 101,
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'F': 102,
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'G': 103,
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'H': 104,
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'I': 105,
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'J': 106,
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'K': 107,
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'L': 108,
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'M': 109,
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'N': 110,
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'O': 111,
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'P': 112,
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'Q': 113,
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'R': 114,
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'S': 115,
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'T': 116,
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'U': 117,
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'V': 118,
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'W': 119,
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'X': 120,
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'Y': 121,
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'Z': 122,
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'{': 179, # left squiggle
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'}': 235, # right squiggle
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'£': 92, # pound currency sign
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'^': 94, # up arrow
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'~': 126, # pi math symbol
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'π': 126, # pi symbol
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'`': 39, # single quote
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'✓': 250, # check mark
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'|': 221, # vertical bar
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'│': 221, # vertical bar
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'─': 96, # horizontal bar
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'┼': 123, # vertical and horizontal bar
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'↑': 94, # up arrow
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'←': 95, # left arrow
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'▔': 163, # upper bar
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'_': 164, # lower bar (underscore)
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'▁': 164, # lower bar
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'▎': 165, # left bar
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'♠': 97, # spades
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'●': 113, # circle
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'♥': 115, # hearts
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'○': 119, # open circle
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'♣': 120, # clubs
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'♦': 122, # diamonds
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'├': 171, # vertical and right
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'┤': 179, # vertical and left
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'┴': 177, # horiz and up
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'┬': 178, # horiz and down
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'└': 173, # up right
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'┐': 174, # down left
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'┌': 175, # down right
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'┘': 189, # up left
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'▗': 172, # block lr
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'▖': 187, # block ll
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'▝': 188, # block ur
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'▘': 190, # block ul
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'▚': 191, # block ul and lr
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'▌': 161, # left half
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'▄': 162, # lower half
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'▒': 230, # raster
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})
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