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# Copyright (C) 2009, 2010  Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import curses.ascii
from collections import deque
from inspect import isfunction, getargspec
from ranger.ext.tree import Tree
from ranger.ext.direction import Direction
from ranger.ext.keybinding_parser import parse_keybinding, \
		DIRKEY, ANYKEY, PASSIVE_ACTION

MAX_ALIAS_RECURSION = 20
FUNC = 'func'
DIRECTION = 'direction'
DIRARG = 'dir'
ALIASARG = 'alias'

def to_string(i):
	"""convert a ord'd integer to a string"""
	try:
		return chr(i)
	except ValueError:
		return '?'

def is_ascii_digit(n):
	return n >= 48 and n <= 57

class CommandArgs(object):
	"""The arguments which are passed to a keybinding function"""
	def __init__(self, fm, widget, keybuffer):
		self.fm = fm
		self.wdg = widget
		self.keybuffer = keybuffer
		self.n = keybuffer.quant
		self.direction = keybuffer.directions and keybuffer.directions[0] or None
		self.directions = keybuffer.directions
		self.keys = str(keybuffer)
		self.matches = keybuffer.matches
		self.match = keybuffer.matches and keybuffer.matches[0] or None
		self.binding = keybuffer.command

	@staticmethod
	def from_widget(widget):
		return CommandArgs(widget.fm, \
				widget, widget.env.keybuffer)

class KeyMap(Tree):
	"""Contains a tree with all the keybindings"""
	def map(self, *args, **keywords):
		if keywords:
			return self._add_binding(*args, **keywords)
		firstarg = args[-1]
		if isfunction(firstarg):
			keywords[FUNC] = firstarg
			return self._add_binding(*args[:-1], **keywords)
		def decorator_function(func):
			keywords = {FUNC:func}
			self.map(*args, **keywords)
			return func
		return decorator_function

	__call__ = map

	def _add_binding(self, *keys, **actions):
		assert keys
		bind = Binding(keys, actions)
		for key in keys:
			self.set(parse_keybinding(key), bind)

	def unmap(self, *keys):
		for key in keys:
			self.unset(parse_keybinding(key))

	def __getitem__(self, key):
		return self.traverse(parse_keybinding(key))


class KeyMapWithDirections(KeyMap):
	def __init__(self, *args, **keywords):
		Tree.__init__(self, *args, **keywords)
		self.directions = KeyMap()

	def merge(self, other):
		assert hasattr(other, 'directions'), 'Merging with wrong type?'
		Tree.merge(self, other)
		Tree.merge(self.directions, other.directions)

	def dir(self, *args, **keywords):
		if ALIASARG in keywords:
			self.directions.map(*args, **keywords)
		else:
			self.directions.map(*args, dir=Direction(**keywords))


class KeyManager(object):
	def __init__(self, keybuffer, contexts):
		self._keybuffer = keybuffer
		self._list_of_contexts = contexts
		self.clear()

	def clear(self):
		self.contexts = dict()
		for context in self._list_of_contexts:
			self.contexts[context] = KeyMapWithDirections()

	def map(self, context, *args, **keywords):
		self.get_context(context).map(*args, **keywords)

	def dir(self, context, *args, **keywords):
		self.get_context(context).dir(*args, **keywords)

	def unmap(self, context, *args, **keywords):
		self.get_context(context).unmap(*args, **keywords)

	def merge_all(self, keymapwithdirection):
		for context, keymap in self.contexts.items():
			keymap.merge(keymapwithdirection)

	def get_context(self, context):
		assert isinstance(context, str)
		assert context in self.contexts, "no such context: " + context
		return self.contexts[context]
	__getitem__ = get_context

	def use_context(self, context):
		context = self.get_context(context)
		if self._keybuffer.keymap is not context:
			self._keybuffer.assign(context, context.directions)
			self._keybuffer.clear()


class Binding(object):
	"""The keybinding object"""
	def __init__(self, keys, actions):
		assert hasattr(keys, '__iter__')
		assert isinstance(actions, dict)
		self.actions = actions
		try:
			self.function = self.actions[FUNC]
		except KeyError:
			self.function = None
		try:
			self.direction = self.actions[DIRARG]
		except KeyError:
			self.direction = None
		<
void test_trace_check_compares() {
  trace("test layer") << "foo" << end();
  CHECK_TRACE_CONTENTS("test layer: foo");
}

void test_trace_check_ignores_other_layers() {
  trace("test layer 1") << "foo" << end();
  trace("test layer 2") << "bar" << end();
  CHECK_TRACE_CONTENTS("test layer 1: foo");
  CHECK_TRACE_DOESNT_CONTAIN("test layer 2: foo");
}

void test_trace_check_ignores_leading_whitespace() {
  trace("test layer 1") << " foo" << end();
  CHECK_EQ(trace_count("test layer 1", /*too little whitespace*/"foo"), 1);
  CHECK_EQ(trace_count("test layer 1", /*too much whitespace*/"  foo"), 1);
}

void test_trace_check_ignores_other_lines() {
  trace("test layer 1") << "foo" << end();
  trace("test layer 1") << "bar" << end();
  CHECK_TRACE_CONTENTS("test layer 1: foo");
}

void test_trace_check_ignores_other_lines2() {
  trace("test layer 1") << "foo" << end();
  trace("test layer 1") << "bar" << end();
  CHECK_TRACE_CONTENTS("test layer 1: bar");
}

void test_trace_ignores_trailing_whitespace() {
  trace("test layer 1") << "foo\n" << end();
  CHECK_TRACE_CONTENTS("test layer 1: foo");
}

void test_trace_ignores_trailing_whitespace2() {
  trace("test layer 1") << "foo " << end();
  CHECK_TRACE_CONTENTS("test layer 1: foo");
}

void test_trace_orders_across_layers() {
  trace("test layer 1") << "foo" << end();
  trace("test layer 2") << "bar" << end();
  trace("test layer 1") << "qux" << end();
  CHECK_TRACE_CONTENTS("test layer 1: footest layer 2: bartest layer 1: qux");
}

void test_trace_supports_count() {
  trace("test layer 1") << "foo" << end();
  trace("test layer 1") << "foo" << end();
  CHECK_EQ(trace_count("test layer 1", "foo"), 2);
}

void test_trace_supports_count2() {
  trace("test layer 1") << "foo" << end();
  trace("test layer 1") << "bar" << end();
  CHECK_EQ(trace_count("test layer 1"), 2);
}

void test_trace_count_ignores_trailing_whitespace() {
  trace("test layer 1") << "foo\n" << end();
  CHECK_EQ(trace_count("test layer 1", "foo"), 1);
}

// pending: DUMP tests
// pending: readable_contents() adds newline if necessary.
// pending: raise also prints to stderr.
// pending: raise doesn't print to stderr if Hide_errors is set.
// pending: raise doesn't have to be saved if Hide_errors is set, just printed.
// pending: raise prints to stderr if Trace_stream is NULL.
// pending: raise prints to stderr if Trace_stream is NULL even if Hide_errors is set.

// can't check trace because trace methods call 'split'

void test_split_returns_at_least_one_elem() {
  vector<string> result = split("", ",");
  CHECK_EQ(result.size(), 1);
  CHECK_EQ(result.at(0), "");
}

void test_split_returns_entire_input_when_no_delim() {
  vector<string> result = split("abc", ",");
  CHECK_EQ(result.size(), 1);
  CHECK_EQ(result.at(0), "abc");
}

void test_split_works() {
  vector<string> result = split("abc,def", ",");
  CHECK_EQ(result.size(), 2);
  CHECK_EQ(result.at(0), "abc");
  CHECK_EQ(result.at(1), "def");
}

void test_split_works2() {
  vector<string> result = split("abc,def,ghi", ",");
  CHECK_EQ(result.size(), 3);
  CHECK_EQ(result.at(0), "abc");
  CHECK_EQ(result.at(1), "def");
  CHECK_EQ(result.at(2), "ghi");
}

void test_split_handles_multichar_delim() {
  vector<string> result = split("abc,,def,,ghi", ",,");
  CHECK_EQ(result.size(), 3);
  CHECK_EQ(result.at(0), "abc");
  CHECK_EQ(result.at(1), "def");
  CHECK_EQ(result.at(2), "ghi");
}

void test_trim() {
  CHECK_EQ(trim(""), "");
  CHECK_EQ(trim(" "), "");
  CHECK_EQ(trim("  "), "");
  CHECK_EQ(trim("a"), "a");
  CHECK_EQ(trim(" a"), "a");
  CHECK_EQ(trim("  a"), "a");
  CHECK_EQ(trim("  ab"), "ab");
  CHECK_EQ(trim("a "), "a");
  CHECK_EQ(trim("a  "), "a");
  CHECK_EQ(trim("ab  "), "ab");
  CHECK_EQ(trim(" a "), "a");
  CHECK_EQ(trim("  a  "), "a");
  CHECK_EQ(trim("  ab  "), "ab");
}