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#!/usr/bin/env python3
import curses
import threading
from .parsers import PARSE_MAP, parse_null, make_parse_letter
from ..globals import CURSES_LOCK
class _Node:
def iter_possible(self):
if None in self.children:
yield self
if [i for i in self.children if i is not None]:
for c in self.children:
if c is None:
continue
yield from c.iter_possible()
def __repr__(self):
return self.path
def __init__(self, parent, parse, var: bool = False, f = None, path = ""):
self.f = f
self.parent = parent
self.parse = parse
self.var = var
self.children = []
self.name = path
if parent is not None:
parent.children.append(self)
self.path = parent.path + (' ' if parent.path else "") + path
else:
self.path = path
#options_help = {
# "test": "This is a test command",
# "set": "Set a channel range to the given value",
# "reset": "Reset the given channels, or all",
#}
#
#root = parse_options([(o.split(' '), f) for o, f in options_list])
#help_map = {}
options_list = (
("test potato $value one two", lambda *args: ('1')),
("test potato two", lambda *args: ('2')),
("test walnut alpha", lambda *args: ('3')),
("test walnut alpha beta", lambda *args: ('4')),
("set $channel_range to $value", lambda cr, v: ("Channel range %s at %s" % (repr(cr), repr(v)))),
("reset $channel_range", lambda cr: ("reset "+repr(cr))),
("reset", lambda: ("reset all")),
)
class Input:
@staticmethod
def parse_context(ctx, help_map=None, help_f=None, parent=None):
if parent is None:
parent = _Node(None, parse_null)
start = {}
for i, f in ctx:
if isinstance(i, str):
i = i.split(' ')
if i[0] not in start:
if parent.parent is None and i[0][0] == 'h':
raise ValueError("No base command may start with h")
start[i[0]] = []
start[i[0]].append((i, f))
for s, ols in start.items():
n = _Node(parent, PARSE_MAP[s] if s[0] == '$' else make_parse_letter(s[0], s),
var=(s[0] == '$'), path=s)
ols = [(ol[1:], f) for ol, f in ols]
for l, f in ols:
if not l:
n.f = f
n.children.append(None)
break
ols = [i for i in ols if i[0]]
if ols:
Input.parse_context(ols, parent=n)
if parent.parent is None and help_f is not None:
if help_map is None:
help_map = {}
root_commands = tuple((i.name for i in parent.children if i is not None))
help_node = _Node(parent, make_parse_letter('h', "help"), path="help")
help_node.children.append(None)
if None in help_map:
help_node.f = lambda: help_f(None, root_commands, help_map[None])
else:
help_node.f = lambda: help_f(None, root_commands, "No help available!")
for s in parent.children:
if s is None or s.name == "help":
continue
options = tuple(s.iter_possible())
hn = _Node(help_node, make_parse_letter(s.name[0], s.name), path=s.name)
hn.children.append(None)
if s.name in help_map:
hn.f = lambda options=options, name=s.name: help_f(name, (o.path for o in options), help_map[name])
else:
hn.f = lambda options=options, name=s.name: help_f(name, (o.path for o in options), "No help available!")
return parent
def set_dim(self, height, width):
if height < 4 or width < 10:
raise ValueError("Size too small")
with self._lock:
if (height, width) != (self._height, self._width):
self.win.erase()
self.win.noutrefresh()
self.win.resize(height, width)
self.win.redrawwin()
self._height = height
self._width = width
self.win.border()
self._redraw()
self.win.noutrefresh()
def set_pos(self, y, x):
with self._lock:
if (y, x) != (self._y, self._x):
self.win.mvwin(y, x)
self._y = y
self._x = x
self.win.border()
self.win.noutrefresh()
def _redraw(self):
with self._lock:
if len(self._l2) > self._width-2:
l2 = self._l2[:self._width-3] + '…'
else:
l2 = self._l2
if len(self._l1) > self._width-5:
l1 = ">> …" + self._l1[::-1][:self._width-6][::-1]
else:
l1 = ">> " + self._l1
self.win.addstr(1, 1, ' '*(self._width-2))
self.win.addstr(2, 1, ' '*(self._width-2))
self.win.addstr(1, 1, l1)
self.win.addstr(2, 1, l2, curses.A_ITALIC)
self.win.move(1, len(l1)+1)
self.win.refresh()
@property
def context(self):
return self._context
@context.setter
def context(self, ctx):
with self._ctx_lock:
self._context = ctx
self._ctx_changed = True
with CURSES_LOCK:
self._l1 = ""
self._l2 = ""
self._redraw()
def main(self, resize=None):
"""Run the input loop.
If `resize` is given, it will be called should the terminal be resized.
"""
with self._ctx_lock:
current = self._context
## In the format:
## (input, parsed, display, is variable?)
path = [["", True, "", False]]
while True:
with self._ctx_lock:
self._l1 = "".join((i[2] for i in path if i[2]))
with CURSES_LOCK:
self._redraw()
l = self.win.getch()
with self._ctx_lock:
if l == curses.KEY_RESIZE:
if resize is not None:
resize()
continue
if self._context is None:
continue
elif self._ctx_changed:
path = path[:1]
self._ctx_changed = False
self._l2 = ""
if l in (127, curses.KEY_BACKSPACE): ## Backspace
if current == self._context:
continue
e = path[-1]
e[0] = e[0][:-1]
if not e[0]:
path.pop(-1)
current = current.parent
continue
e[1], _, e[2] = current.parse(e[0])
elif l in (10, curses.KEY_ENTER) and None in current.children: ## Enter
ret = current.f(*(i[1] for i in path if i[3]))
self._l2 = "OK" if ret is None else str(ret)
path = path[:1]
current = self._context
else:
e = path[-1]
s = e[0] + chr(l)
parsed, s, display = current.parse(s)
if parsed is None and s: ## Invalid input
self._l2 = "Expected \"%s\"" % current.name
continue
e[1], e[2] = parsed, display
if not s: ## We're still working on this one
e[0] += chr(l)
continue
## We're done with this one, the only remaining option is to move on
for n in current.children:
if n is None:
continue
parsed, cs, display = n.parse(s)
if not cs:
## Found it
if current.parent is not None:
e[2] = e[2] + ' '
current = n
e = [s, parsed, display, n.var]
path.append(e)
break
else:
self._l2 = "Available: %s" % ", ".join((("ENTER" if n is None else '"'+n.name+'"') for n in current.children))
def __init__(self, y, x, height, width):
with CURSES_LOCK:
self.win = curses.newwin(height, width, y, x)
self.win.keypad(True)
self._lock = threading.RLock()
self._height = height
self._width = width
self._y = -1
self._x = -1
self._l1 = ""
self._l2 = ""
self.set_pos(y, x)
self.set_dim(height, width)
self._ctx_lock = threading.RLock()
self._context = None
self._ctx_changed = False
self._redraw()
def main2(stdscr):
w = Input(0, 0, 4, 100)
w.context = Input.parse_context(options_list)
w.main()
if __name__ == "__main__":
curses.wrapper(main2)
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