#!/usr/bin/python

import unittest, cProfile
from ppci import CompilerError
from asmnodes import AInstruction, ABinop, AUnop, ASymbol, ALabel, ANumber
from asm import tokenize, Assembler
import outstream
from target import Label


class AssemblerLexingCase(unittest.TestCase):
    """ Tests the assemblers lexer """

    def testLex0(self):
        """ Check if the lexer is OK """
        asmline, toks = 'mov rax, rbx ', ['ID', 'ID', ',', 'ID']
        self.assertSequenceEqual([tok.typ for tok in tokenize(asmline)], toks)

    def testLex1(self):
        """ Test if lexer correctly maps some tokens """
        asmline, toks = 'lab1: mov rax, rbx ', ['ID', ':', 'ID', 'ID', ',', 'ID']
        self.assertSequenceEqual([tok.typ for tok in tokenize(asmline)], toks)

    def testLex1(self):
        """ Test if lexer correctly maps some tokens """
        asmline, toks = 'mov 3.13 0xC 13', ['ID', 'REAL', 'NUMBER', 'NUMBER']
        self.assertSequenceEqual([tok.typ for tok in tokenize(asmline)], toks)

    def testLex2(self):
        """ Test if lexer fails on a token that is invalid """
        asmline = '0z4: mov rax, rbx $ '
        with self.assertRaises(CompilerError):
            list(tokenize(asmline))


class AssemblerParsingTestCase(unittest.TestCase):
    """ 
        Tests the assembler parts
    """
    def setUp(self):
        self.a = Assembler()

    def testParse(self):
        asmline = 'lab1: mov rax, rbx'
        self.a.parse_line(asmline)

    def expectTree(self, asmline, stack):
        self.a.parse_line(asmline)
        self.assertSequenceEqual(stack, self.a.stack)

    def testParse2(self):
        asmline = 'a: mov rax, [rbx + 2]'
        output = []
        output.append(ALabel('a'))
        output.append(AInstruction('mov', [ASymbol('rax'), AUnop('[]', ASymbol('rbx') + ANumber(2))]))
        self.expectTree(asmline, output)

    def testParse3(self):
        # A label must be optional:
        asmline = 'mov rax, 1'
        output = [AInstruction('mov', [ASymbol('rax'), ANumber(1)])]
        self.expectTree(asmline, output)

    def testParse4(self):
        # Test 3 operands:
        asmline = 'add rax, [4*rbx + 22], rcx'
        ops = []
        ops.append(ASymbol('rax'))
        ops.append(AUnop('[]', ANumber(4) * ASymbol('rbx') + ANumber(22)))
        ops.append(ASymbol('rcx'))
        output = [AInstruction('add', ops)]
        self.expectTree(asmline, output)

    def testParse5(self):
        # An instruction must be optional:
        asmline = 'lab1:'
        output = []
        output.append(ALabel('lab1'))
        self.expectTree(asmline, output)

    def testParse6(self):
        # A line can be empty
        self.a.parse_line('')
    

class AssemblerOtherTestCase(unittest.TestCase):
    def testWithoutTarget(self):
        a = Assembler()
        with self.assertRaises(CompilerError):
            a.assemble_line('')


class OustreamTestCase(unittest.TestCase):
    def test1(self):
        o = outstream.BinOutputStream()
        o.selectSection('.text')
        o.emit(Label('a'))
        self.assertSequenceEqual(bytes(), o.Data)


class AsmTestCaseBase(unittest.TestCase):
    """ Base testcase for assembly """
    def feed(self, line):
        self.a.assemble(line)

    def check(self, hexstr):
        self.assertSequenceEqual(bytes.fromhex(hexstr), self.o.Data)


if __name__ == '__main__':
    unittest.main()