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name : Filer.py
 """ Handles filing of data from low-level gsl filing and data records.
"""


class Filer:
    def __init__(self, mod, node):
        self.mod = mod
        self.writefile_envs = []
        self.writefile_names = {}

        node.accept(self)

    def visit_file(self, node):
        node.children_accept(self)

    visit_string = visit_file

    def visit_write_file(self, node):
        name = node.arg
        if name in self.writefile_names:
            raise SyntaxError('Duplicate file name: %r' % name)
        self.writefile_names[name] = node
        self.writefile_envs.append(WriteFile(self, node))

    def get_info(self):
        infos = []
        for e in self.writefile_envs:
            infos.append('write file: %s' % e.file_name)
        return '\n'.join(infos)

    def write(self):
        for e in self.writefile_envs:
            e.write()


class WriteFile:
    node_data = None
    node_mode = None

    def __init__(self, filer, node):
        self.filer = filer
        self.mod = mod = filer.mod
        self.node_file = node
        self.file_name = node.arg

        node.children_accept(self)
        if self.node_data is None:
            data = ''
        else:
            data = self.node_data.arg
        self.data = data
        if self.node_mode is None:
            mode = ''
        else:
            mode = self.node_mode.arg
        self.mode = mode

    def visit_text(self, node):
        self.set_single('node_data', node)

    def visit_end(self, node):
        self.set_single('node_end', node)

    def visit_mode(self, node):
        self.set_single('node_mode', node)

    def set_single(self, name, node):
        if getattr(self, name, None) is not None:
            raise SyntaxError('Duplicate %r at index %r' % (name, node.index))
        setattr(self, name, node)
        node.children_accept(self, 'no_node_expected')

    def write(self):
        IO = self.mod.IO
        if self.mod.backup_suffix:
            backup_name = self.file_name + self.mod.backup_suffix
            if IO.access(self.file_name, IO.R_OK | IO.W_OK):
                IO.rename(self.file_name, backup_name)

        IO.write_file(self.file_name, self.data)


class _GLUECLAMP_:
    _imports_ = (
        '_parent.FileIO:IO',
    )

    _setable_ = 'backup_suffix',

    # Files that are to be overwritten are renamed by
    # adding backup_suffix to the name. This is no substitute for a
    # versioning system but a last precaution, especially while I am
    # developing the system.
    # Set this to None to disable backuping.

    backup_suffix = ',gsl-backuped'

    syntax_gsl = '''
.tag writefile

'''

    def filer(self, node):
        return Filer(self, node)

    def _test_main_(self):
        IO = self.IO
        N = self._parent.SpecNodes
        tempdir = IO.mkdtemp()
        tempname = IO.path.join(tempdir, 'x')
        data = 'hello'
        try:
            X = '''
.write file: %s
..text
%s
..end
''' % (tempname, data)
            node = N.node_of_string(X)
            f = self.filer(node)
            assert f.get_info() == 'write file: %s' % tempname
            f.write()
            d = IO.read_file(tempname)
            assert d == data

            # Test multiple files and backup
            # And that we can do without ..data / ..end

            data2 = 'hello2\n'
            data3 = '\nhello3'
            X = '''
.write file: %s
..text
%s
.write file: %s
..text
%s
..end
''' % (tempname, data2, tempname+'.3', data3)

            node = N.node_of_string(X)
            f = self.filer(node)
            f.write()

            assert IO.read_file(tempname+self.backup_suffix) == data
            d = IO.read_file(tempname)
            assert d == data2
            assert IO.read_file(tempname+'.3') == data3

        finally:
            for name in IO.listdir(tempdir):
                IO.remove(IO.path.join(tempdir, name))
            IO.rmdir(tempdir)
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