#!/usr/bin/python

import unittest
from ppci import CompilerError
from ppci.assembler import AsmLexer
from ppci.objectfile import ObjectFile
from ppci.outstream import BinaryOutputStream
from ppci.target.basetarget import Label
from ppci.buildfunctions import link


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

    def setUp(self):
        self.lexer = AsmLexer([])

    def do(self, asmline, toks):
        output = []
        self.lexer.feed(asmline)
        while 'EOF' not in output:
            output.append(self.lexer.next_token().typ)
        self.assertSequenceEqual(toks, output)

    def testLex0(self):
        """ Check if the lexer is OK """
        asmline = 'mov rax, rbx '
        toks = ['ID', 'ID', ',', 'ID', 'EOF']
        self.do(asmline, toks)

    def testLex1(self):
        """ Test if lexer correctly maps some tokens """
        asmline = 'lab1: mov rax, rbx '
        toks = ['ID', ':', 'ID', 'ID', ',', 'ID', 'EOF']
        self.do(asmline, toks)

    def testLex2(self):
        """ Test if lexer correctly maps some tokens """
        asmline, toks = 'mov 3.13 0xC 13', ['ID', 'REAL', 'val5', 'val5', 'EOF']
        self.do(asmline, toks)

    def testLex3(self):
        """ Test if lexer fails on a token that is invalid """
        asmline = '0z4: mov rax, rbx $ '
        with self.assertRaises(CompilerError):
            self.do(asmline, [])


class OustreamTestCase(unittest.TestCase):
    def test1(self):
        obj = ObjectFile()
        o = BinaryOutputStream(obj)
        o.select_section('.text')
        o.emit(Label('a'))
        self.assertSequenceEqual(bytes(), obj.get_section('.text').data)


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

    def check(self, hexstr, layout={}):
        self.assembler.flush()
        self.obj = link([self.obj], layout)
        data = bytes(self.obj.get_section('.text').data)
        self.assertSequenceEqual(bytes.fromhex(hexstr), data)


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