import py
from py.__.apigen.linker import Linker, getrelfspath, relpath

class TestLinker(object):
    def test_get_target(self):
        linker = Linker()
        lazyhref = linker.get_lazyhref('py.path.local')
        linker.set_link('py.path.local', 'py/path/local.html')
        relpath = linker.get_target('py.path.local')
        assert relpath == 'py/path/local.html'
   
    def test_target_relative(self):
        linker = Linker()
        lazyhref = linker.get_lazyhref('py.path.local')
        linker.set_link('py.path.local', 'py/path/local.html')
        relpath = linker.call_withbase('py/index.html', 
                    linker.get_target, 'py.path.local')
        assert relpath == 'path/local.html'


        
testspec = [
    'a    a/b   a/b', 
    '/a   /a/b  a/b', 
    'a    b     b',
    '/a   /b    b',
    'a/b  c/d   ../c/d', 
    '/a/b  /c/d   ../c/d', 
    'a/b  a     ../a', 
    '/a/b /a   ../a', 
]     

def gen_check(frompath, topath, expected):
    result = relpath(frompath, topath)
    print "linking", frompath, "to", topath
    assert result == expected

def test_gen_check():
    for line in testspec:
        frompath, topath, expected = line.split()
        yield gen_check, frompath, topath, expected

def test_check_incompatible():
    py.test.raises(ValueError, "relpath('/a', 'b')")