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|
#!/usr/bin/env python3
import sys
from typing import Any, MutableSequence, Tuple
import ply.yacc as yacc
from ply.lex import LexToken
# Get the token map from the lexer. This is required.
from .lexer import tokens
from . import parser_types as pt
P = MutableSequence[Any]
def p_program(p: P) -> None:
"""program : instruction_list
| empty
"""
p[0] = p[1]
def p_empty(p: P) -> None:
"""empty :"""
pass
def p_instructions(p: P) -> None:
"""instruction_list : instruction_list line
| line
"""
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[2]]
pass
# # try right-recursive?
# def p_instructions2(p: P) -> None:
# """instruction_list2 : line instruction_list2
# | line
# """
# if len(p) == 2:
# p[0] = [p[1]]
# else:
# p[0] = [p[1]] + p[2]
# print(f"INSes2: {len(p)}")
# print(f" {p[1]}")
# if len(p) > 2:
# print(f" {p[2]}")
# pass
def p_line(p: P) -> None:
"""line : instruction NL
| jumpdest NL
| NL
"""
# | instruction error NL
# | jumpdest error NL
if len(p) == 2:
pass
elif len(p) == 3:
p[0] = p[1]
print(f"Item: {p[0]}")
# if error handling
else:
p[0] = p[1]
assert(False)
def p_instruction(p: P) -> None:
"""instruction : valid_instruction
| one_arg_invalid
"""
p[0] = p[1]
def p_valid_instruction(p: P) -> None:
"""valid_instruction : no_args
| two_arg
| three_arg
"""
tp: Tuple[Any, Any, Any, Any, Any] = p[1]
p[0] = pt.Instruction(p.lineno(1), *tp)
def p_jumpdest(p: P) -> None:
"""jumpdest : symbol COLON"""
p[0] = pt.JumpTarget(lineno=p.lineno(1), label=p[1])
def p_no_arg(p: P) -> None:
"""no_args : opcode"""
p[0] = (*p[1], None, None, None)
pass
def p_onearg_invalid(p: P) -> None:
"""one_arg_invalid : opcode argument"""
op: Tuple[str,str] = p[1]
p[0] = pt.ErrorInstruction(p.lineno(1), op[1], "No opcode only supports one argument.")
pass
def p_two_arg(p: P) -> None:
"""two_arg : opcode register COMMA argument"""
p[0] = (*p[1], p[2], p[4], None)
pass
def p_three_arg(p: P) -> None:
"""three_arg : opcode register COMMA argument COMMA argument"""
p[0] = (*p[1], p[2], p[4], p[6])
pass
# checks which combinations are allowed is done one level up
def p_argument(p: P) -> None:
"""argument : number
| register
| symbol
"""
p[0] = p[1]
def p_symbol(p: P) -> None:
"""symbol : SYMBOL"""
p[0] = pt.Symbol(p[1])
def p_register(p: P) -> None:
"""register : REG"""
p[0] = pt.Register(p[1])
def p_opcode(p: P) -> None:
"""opcode : opcode_jmp
| opcode_njmp
"""
p[0] = p[1]
def p_opcode_jmp(p: P) -> None:
"""opcode_jmp : OP DOT JUMP
"""
p[0] = (p[1], p[3])
def p_opcode_njmp(p: P) -> None:
"""opcode_njmp : OP
"""
p[0] = (p[1], None)
def p_number(p: P) -> None:
"""number : NUMBER
| HEXNUMBER
"""
p[0] = pt.Immediate(p[1])
def p_error(p: LexToken) -> LexToken:
if p:
print(f"WARNING: Unexpected {repr(p.value)} on line {p.lineno}", file=sys.stderr)
else:
print("WARNING: Unexpected end of file.", file=sys.stderr)
return
while True:
tok = parser.token()
if not tok or tok.type == 'NL':
break
parser.errok()
return tok
parser = yacc.yacc()
|
