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# Copyright 2014-2015, Sinclair R.F., Inc.

from asmDef import AsmException

def storeoffset(ad):

  """

  Built-in macro to store the top of the data stack at the specified offset

  into the specified variable.\n

  Usage:

    <v> .storeoffset(variable,ix[,op])

  where:

    <v>         is the value to be stored

    variable    is the name of the variable

    ix          is the index into the variable

    op          is an optional instruction to override the default "drop"

                instruction at the end of the instruction sequence\n

  The effect is:  variable[ix] = v\n

  ( v - )

  """

  # Add the macro to the list of recognized macros.

  ad.AddMacro('.storeoffset', 3, [

                                   ['','symbol'],

                                   ['','singlevalue','symbol'],

                                   ['drop','instruction','parameter','singlemacro','singlevalue','symbol']

                                 ]);

  # Define the macro functionality.

  def emitFunction(ad,fp,argument):

    (addr,ixBank,bankName) = ad.Emit_GetAddrAndBank(argument[0]);

    offset = ad.Emit_EvalSingleValue(argument[1]);

    if addr+offset >= 256:

      raise asmDef.AsmException('Unreasonable address+length=0x%02X+0x%02X >= 256 at %s' % (addr,N,argument[0]['loc'],))

    ad.EmitPush(fp,addr+offset,ad.Emit_String('%s+%s' % (argument[0]['value'],offset,)),argument[0]['loc']);

    ad.EmitOpcode(fp,ad.specialInstructions['store'] | ixBank,'store '+bankName);

    ad.EmitOptArg(fp,argument[2]);

  ad.EmitFunction['.storeoffset'] = emitFunction;