import struct
import types
from ..basetarget import Register, Instruction, Target
from ppci.asmnodes import ASymbol, ANumber
from ppci import CompilerError
from .registers import r10, r11, r12, r13, r14, r15
from .instructions import Reti, Mov, Add

# Create the target class (singleton):

class Msp430Target(Target):
    def __init__(self):
        super().__init__('msp430')

        # Registers:
        self.add_keyword('r10')
        self.add_keyword('r11')
        self.add_keyword('r12')
        self.add_keyword('r13')
        self.add_keyword('r14')
        self.add_keyword('r15')
        self.add_rule('reg', ['r10'], lambda rhs: r10)
        self.add_rule('reg', ['r11'], lambda rhs: r11)
        self.add_rule('reg', ['r12'], lambda rhs: r12)
        self.add_rule('reg', ['r13'], lambda rhs: r13)
        self.add_rule('reg', ['r14'], lambda rhs: r14)
        self.add_rule('reg', ['r15'], lambda rhs: r15)

        # Instructions rules:
        self.add_keyword('mov')
        self.add_instruction(['mov', 'reg', ',', 'reg'],
            lambda rhs: Mov(rhs[1], rhs[3]))
        self.add_instruction(['mov', 'imm16', ',', 'reg'],
            lambda rhs: Mov(rhs[1], rhs[3]))

        self.add_keyword('add')
        self.add_instruction(['add', 'reg', ',', 'reg'],
            lambda rhs: Add(rhs[1], rhs[3]))

        self.add_keyword('reti')
        self.add_instruction(['reti'], lambda rhs: Reti())

        # Constants:
        self.add_rule('imm32', ['val32'], lambda x: x[0].val)
        self.add_rule('imm32', ['imm16'], lambda x: x[0])
        self.add_rule('imm16', ['val16'], lambda x: x[0].val)
        self.add_rule('imm16', ['imm8'], lambda x: x[0])
        self.add_rule('imm8', ['val8'], lambda x: x[0].val)
        self.add_rule('imm8', ['imm5'], lambda x: x[0])
        self.add_rule('imm5', ['val5'], lambda x: x[0].val)
        self.add_rule('imm5', ['imm3'], lambda x: x[0])
        self.add_rule('imm3', ['val3'], lambda x: x[0].val)


msp430target = Msp430Target()


# Target description for the MSP430 processor


msp430target.registers.append(r10)
msp430target.registers.append(r11)
msp430target.registers.append(r12)
msp430target.registers.append(r13)
msp430target.registers.append(r14)
msp430target.registers.append(r15)