Prompt.on_keypress() - Code Metrics - Inspection of "Fix on_update status change" - lambdalisue/neovim-prompt - Measure and Improve Code Quality continuously with Scrutinizer

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by Lambda

created 2016-11-25 07:58 UTC

Prompt.on_keypress() A

↳ Parent: Prompt

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Changes	8
Bugs	0	Features	0

Metric	Value
cc	2
c	8
b	0
f	0
dl	0
loc	23
rs	9.0856

"""Prompt module."""
import copy
import re
import weakref
from collections import namedtuple
from datetime import timedelta
from .action import ACTION_PATTERN
from .util import ESCAPE_ECHO, build_echon_expr


ACTION_KEYSTROKE_PATTERN = re.compile(
    r'<(?P<action>%s)>' % ACTION_PATTERN.pattern
)


STATUS_PROGRESS = 0
STATUS_ACCEPT = 1
STATUS_CANCEL = 2
STATUS_ERROR = 3

INSERT_MODE_INSERT = 1
INSERT_MODE_REPLACE = 2


Condition = namedtuple('Condition', ['text', 'caret_locus'])


class Prompt:
    """Prompt class."""

    prefix = ''

    def __init__(self, nvim):
        """Constructor.

        Args:
            nvim (neovim.Nvim): A ``neovim.Nvim`` instance.
        """
        from .caret import Caret
        from .history import History
        from .keymap import DEFAULT_KEYMAP_RULES, Keymap
        from .action import DEFAULT_ACTION
        self.text = ''
        self.nvim = nvim
        self.insert_mode = INSERT_MODE_INSERT
        self.caret = Caret(weakref.proxy(self))
        self.history = History(weakref.proxy(self))
        self.action = copy.copy(DEFAULT_ACTION)
        self.keymap = Keymap.from_rules(nvim, DEFAULT_KEYMAP_RULES)

    def insert_text(self, text):
        """Insert text after the caret.

        Args:
            text (str): A text which will be inserted after the caret.

        Example:
            >>> from unittest.mock import MagicMock
            >>> nvim = MagicMock()
            >>> nvim.options = {'encoding': 'utf-8'}
            >>> prompt = Prompt(nvim)
            >>> prompt.text = "Hello Goodbye"
            >>> prompt.caret.locus = 3
            >>> prompt.insert_text('AA')
            >>> prompt.text
            'HelAAlo Goodbye'
        """
        locus = self.caret.locus
        self.text = ''.join([
            self.caret.get_backward_text(),
            text,
            self.caret.get_selected_text(),
            self.caret.get_forward_text(),
        ])
        self.caret.locus = locus + len(text)

    def replace_text(self, text):
        """Replace text after the caret.

        Args:
            text (str): A text which will be replaced after the caret.

        Example:
            >>> from unittest.mock import MagicMock
            >>> nvim = MagicMock()
            >>> nvim.options = {'encoding': 'utf-8'}
            >>> prompt = Prompt(nvim)
            >>> prompt.text = "Hello Goodbye"
            >>> prompt.caret.locus = 3
            >>> prompt.replace_text('AA')
            >>> prompt.text
            'HelAA Goodbye'
        """
        locus = self.caret.locus
        self.text = ''.join([
            self.caret.get_backward_text(),
            text,
            self.caret.get_forward_text()[len(text) - 1:],
        ])
        self.caret.locus = locus + len(text)

    def update_text(self, text):
        """Insert or replace text after the caret.

        Args:
            text (str): A text which will be replaced after the caret.

        Example:
            >>> from unittest.mock import MagicMock
            >>> nvim = MagicMock()
            >>> nvim.options = {'encoding': 'utf-8'}
            >>> prompt = Prompt(nvim)
            >>> prompt.text = "Hello Goodbye"
            >>> prompt.caret.locus = 3
            >>> prompt.insert_mode = INSERT_MODE_INSERT
            >>> prompt.update_text('AA')
            >>> prompt.text
            'HelAAlo Goodbye'
            >>> prompt.insert_mode = INSERT_MODE_REPLACE
            >>> prompt.update_text('BB')
            >>> prompt.text
            'HelAABB Goodbye'
        """
        if self.insert_mode == INSERT_MODE_INSERT:
            self.insert_text(text)
        else:
            self.replace_text(text)

    def redraw_prompt(self):
        """Redraw prompt."""
        # NOTE:
        # There is a highlight name 'Cursor' but some sometime the visibility
        # is quite low (e.g. tender) so use 'IncSearch' instead while the
        # visibility is quite good and most recent colorscheme care about it.
        backward_text = self.caret.get_backward_text()
        selected_text = self.caret.get_selected_text()
        forward_text = self.caret.get_forward_text()
        self.nvim.command('|'.join([
            'redraw',
            build_echon_expr(self.prefix, 'Question'),
            build_echon_expr(backward_text, 'None'),
            build_echon_expr(selected_text, 'IncSearch'),
            build_echon_expr(forward_text, 'None'),
        ]))

    def start(self):
        """Start prompt and return value.

        Returns:
            int: The status of the prompt.
        """
        status = self.on_init() or STATUS_PROGRESS
        if self.nvim.options['timeout']:
            timeoutlen = timedelta(
                milliseconds=int(self.nvim.options['timeoutlen'])
            )
        else:
            timeoutlen = None
        try:
            status = self.on_update(status) or STATUS_PROGRESS
            while status is STATUS_PROGRESS:
                self.on_redraw()
                status = self.on_keypress(self.keymap.harvest(
                    self.nvim,
                    timeoutlen=timeoutlen,
                    callback=self.on_harvest,
                )) or STATUS_PROGRESS
                status = self.on_update(status) or status
        except KeyboardInterrupt:
            status = STATUS_CANCEL
        except Exception as e:
            self.nvim.command('|'.join([
                'echoerr "%s"' % line.translate(ESCAPE_ECHO)
                for line in str(e).splitlines()
            ]))
            status = STATUS_ERROR
        self.nvim.command('redraw!')
        if self.text:
            self.nvim.call('histadd', 'input', self.text)
        return self.on_term(status)

    def on_init(self):
        """Initialize the prompt.

        It calls 'inputsave' function in Vim in default.

        Returns:
            None or int: The return value will be used as a status of the
                prompt mainloop, indicating that if return value is not
                STATUS_PROGRESS, the prompt mainloop immediately terminated.
                Returning None is equal to returning STATUS_PROGRESS.
        """
        self.nvim.call('inputsave')

    def on_update(self, status):
        """Update the prompt status and return the status.

        It is used to update the prompt status. In default, it does nothing and
        return the specified ``status`` directly.

        Args:
            status (int): A prompt status which is updated by previous
                on_keypress call.

        Returns:
            None or int: The return value will be used as a status of the
                prompt mainloop, indicating that if return value is not
                STATUS_PROGRESS, the prompt mainloop immediately terminated.
                Returning None is equal to returning STATUS_PROGRESS.
        """
        pass

    def on_redraw(self):
        """Redraw the prompt.

        It is used to redraw the prompt. In default, it echos specified prefix
        the caret, and input text.
        """
        self.redraw_prompt()

    def on_harvest(self):
        """Callback which is called during a keycode harvest.

        This callback is called most often. Developers should not call heavy
        procession on this callback.

        """
        pass

    def on_keypress(self, keystroke):
        """Handle a pressed keystroke and return the status.

        It is used to handle a pressed keystroke. Note that subclass should NOT
        override this method to perform actions. Register a new custom action
        instead. In default, it call action and return the result if the
        keystroke looks like <xxx:xxx>.

        Args:
            keystroke (Keystroke): A pressed keystroke instance. Note that this
                instance is a reslved keystroke instace by keymap.

        Returns:
            None or int: The return value will be used as a status of the
                prompt mainloop, indicating that if return value is not
                STATUS_PROGRESS, the prompt mainloop immediately terminated.
                Returning None is equal to returning STATUS_PROGRESS.
        """
        m = ACTION_KEYSTROKE_PATTERN.match(str(keystroke))
        if m:
            return self.action.call(self, m.group('action'))
        else:
            self.update_text(str(keystroke))

    def on_term(self, status):
        """Finalize the prompt.

        It calls 'inputrestore' function in Vim to finalize the prompt in
        default. The return value is used as a return value of the prompt.

        Args:
            status (int): A prompt status.

        Returns:
            int: A status which is used as a result value of the prompt.
        """
        self.nvim.call('inputrestore')
        return status

    def store(self):
        """Save current prompt condition into a Condition instance."""
        return Condition(
            text=self.text,
            caret_locus=self.caret.locus,
        )

    def restore(self, condition):
        """Load current prompt condition from a Condition instance."""
        self.text = condition.text
        self.caret.locus = condition.caret_locus


1			"""Prompt module."""
2			import copy
3			import re
4			import weakref
5			from collections import namedtuple
6			from datetime import timedelta
7			from .action import ACTION_PATTERN
8			from .util import ESCAPE_ECHO, build_echon_expr
9
10
11			ACTION_KEYSTROKE_PATTERN = re.compile(
12			r'<(?P<action>%s)>' % ACTION_PATTERN.pattern
13			)
14
15
16			STATUS_PROGRESS = 0
17			STATUS_ACCEPT = 1
18			STATUS_CANCEL = 2
19			STATUS_ERROR = 3
20
21			INSERT_MODE_INSERT = 1
22			INSERT_MODE_REPLACE = 2
23
24
25			Condition = namedtuple('Condition', ['text', 'caret_locus'])
26
27
28			class Prompt:
29			"""Prompt class."""
30
31			prefix = ''
32
33			def __init__(self, nvim):
34			"""Constructor.
35
36			Args:
37			nvim (neovim.Nvim): A ``neovim.Nvim`` instance.
38			"""
39			from .caret import Caret
40			from .history import History
41			from .keymap import DEFAULT_KEYMAP_RULES, Keymap
42			from .action import DEFAULT_ACTION
43			self.text = ''
44			self.nvim = nvim
45			self.insert_mode = INSERT_MODE_INSERT
46			self.caret = Caret(weakref.proxy(self))
47			self.history = History(weakref.proxy(self))
48			self.action = copy.copy(DEFAULT_ACTION)
49			self.keymap = Keymap.from_rules(nvim, DEFAULT_KEYMAP_RULES)
50
51			def insert_text(self, text):
52			"""Insert text after the caret.
53
54			Args:
55			text (str): A text which will be inserted after the caret.
56
57			Example:
58			>>> from unittest.mock import MagicMock
59			>>> nvim = MagicMock()
60			>>> nvim.options = {'encoding': 'utf-8'}
61			>>> prompt = Prompt(nvim)
62			>>> prompt.text = "Hello Goodbye"
63			>>> prompt.caret.locus = 3
64			>>> prompt.insert_text('AA')
65			>>> prompt.text
66			'HelAAlo Goodbye'
67			"""
68			locus = self.caret.locus
69			self.text = ''.join([
70			self.caret.get_backward_text(),
71			text,
72			self.caret.get_selected_text(),
73			self.caret.get_forward_text(),
74			])
75			self.caret.locus = locus + len(text)
76
77			def replace_text(self, text):
78			"""Replace text after the caret.
79
80			Args:
81			text (str): A text which will be replaced after the caret.
82
83			Example:
84			>>> from unittest.mock import MagicMock
85			>>> nvim = MagicMock()
86			>>> nvim.options = {'encoding': 'utf-8'}
87			>>> prompt = Prompt(nvim)
88			>>> prompt.text = "Hello Goodbye"
89			>>> prompt.caret.locus = 3
90			>>> prompt.replace_text('AA')
91			>>> prompt.text
92			'HelAA Goodbye'
93			"""
94			locus = self.caret.locus
95			self.text = ''.join([
96			self.caret.get_backward_text(),
97			text,
98			self.caret.get_forward_text()[len(text) - 1:],
99			])
100			self.caret.locus = locus + len(text)
101
102			def update_text(self, text):
103			"""Insert or replace text after the caret.
104
105			Args:
106			text (str): A text which will be replaced after the caret.
107
108			Example:
109			>>> from unittest.mock import MagicMock
110			>>> nvim = MagicMock()
111			>>> nvim.options = {'encoding': 'utf-8'}
112			>>> prompt = Prompt(nvim)
113			>>> prompt.text = "Hello Goodbye"
114			>>> prompt.caret.locus = 3
115			>>> prompt.insert_mode = INSERT_MODE_INSERT
116			>>> prompt.update_text('AA')
117			>>> prompt.text
118			'HelAAlo Goodbye'
119			>>> prompt.insert_mode = INSERT_MODE_REPLACE
120			>>> prompt.update_text('BB')
121			>>> prompt.text
122			'HelAABB Goodbye'
123			"""
124			if self.insert_mode == INSERT_MODE_INSERT:
125			self.insert_text(text)
126			else:
127			self.replace_text(text)
128
129			def redraw_prompt(self):
130			"""Redraw prompt."""
131			# NOTE:
132			# There is a highlight name 'Cursor' but some sometime the visibility
133			# is quite low (e.g. tender) so use 'IncSearch' instead while the
134			# visibility is quite good and most recent colorscheme care about it.
135			backward_text = self.caret.get_backward_text()
136			selected_text = self.caret.get_selected_text()
137			forward_text = self.caret.get_forward_text()
138			self.nvim.command('\|'.join([
139			'redraw',
140			build_echon_expr(self.prefix, 'Question'),
141			build_echon_expr(backward_text, 'None'),
142			build_echon_expr(selected_text, 'IncSearch'),
143			build_echon_expr(forward_text, 'None'),
144			]))
145
146			def start(self):
147			"""Start prompt and return value.
148
149			Returns:
150			int: The status of the prompt.
151			"""
152			status = self.on_init() or STATUS_PROGRESS
153			if self.nvim.options['timeout']:
154			timeoutlen = timedelta(
155			milliseconds=int(self.nvim.options['timeoutlen'])
156			)
157			else:
158			timeoutlen = None
159			try:
160			status = self.on_update(status) or STATUS_PROGRESS
161			while status is STATUS_PROGRESS:
162			self.on_redraw()
163			status = self.on_keypress(self.keymap.harvest(
164			self.nvim,
165			timeoutlen=timeoutlen,
166			callback=self.on_harvest,
167			)) or STATUS_PROGRESS
168			status = self.on_update(status) or status
169			except KeyboardInterrupt:
170			status = STATUS_CANCEL
171			except Exception as e:
172			self.nvim.command('\|'.join([
173			'echoerr "%s"' % line.translate(ESCAPE_ECHO)
174			for line in str(e).splitlines()
175			]))
176			status = STATUS_ERROR
177			self.nvim.command('redraw!')
178			if self.text:
179			self.nvim.call('histadd', 'input', self.text)
180			return self.on_term(status)
181
182			def on_init(self):
183			"""Initialize the prompt.
184
185			It calls 'inputsave' function in Vim in default.
186
187			Returns:
188			None or int: The return value will be used as a status of the
189			prompt mainloop, indicating that if return value is not
190			STATUS_PROGRESS, the prompt mainloop immediately terminated.
191			Returning None is equal to returning STATUS_PROGRESS.
192			"""
193			self.nvim.call('inputsave')
194
195			def on_update(self, status):
196			"""Update the prompt status and return the status.
197
198			It is used to update the prompt status. In default, it does nothing and
199			return the specified ``status`` directly.
200
201			Args:
202			status (int): A prompt status which is updated by previous
203			on_keypress call.
204
205			Returns:
206			None or int: The return value will be used as a status of the
207			prompt mainloop, indicating that if return value is not
208			STATUS_PROGRESS, the prompt mainloop immediately terminated.
209			Returning None is equal to returning STATUS_PROGRESS.
210			"""
211			pass
212
213			def on_redraw(self):
214			"""Redraw the prompt.
215
216			It is used to redraw the prompt. In default, it echos specified prefix
217			the caret, and input text.
218			"""
219			self.redraw_prompt()
220
221			def on_harvest(self):
222			"""Callback which is called during a keycode harvest.
223
224			This callback is called most often. Developers should not call heavy
225			procession on this callback.
226
227			"""
228			pass
229
230			def on_keypress(self, keystroke):
231			"""Handle a pressed keystroke and return the status.
232
233			It is used to handle a pressed keystroke. Note that subclass should NOT
234			override this method to perform actions. Register a new custom action
235			instead. In default, it call action and return the result if the
236			keystroke looks like <xxx:xxx>.
237
238			Args:
239			keystroke (Keystroke): A pressed keystroke instance. Note that this
240			instance is a reslved keystroke instace by keymap.
241
242			Returns:
243			None or int: The return value will be used as a status of the
244			prompt mainloop, indicating that if return value is not
245			STATUS_PROGRESS, the prompt mainloop immediately terminated.
246			Returning None is equal to returning STATUS_PROGRESS.
247			"""
248			m = ACTION_KEYSTROKE_PATTERN.match(str(keystroke))
249			if m:
250			return self.action.call(self, m.group('action'))
251			else:
252			self.update_text(str(keystroke))
253
254			def on_term(self, status):
255			"""Finalize the prompt.
256
257			It calls 'inputrestore' function in Vim to finalize the prompt in
258			default. The return value is used as a return value of the prompt.
259
260			Args:
261			status (int): A prompt status.
262
263			Returns:
264			int: A status which is used as a result value of the prompt.
265			"""
266			self.nvim.call('inputrestore')
267			return status
268
269			def store(self):
270			"""Save current prompt condition into a Condition instance."""
271			return Condition(
272			text=self.text,
273			caret_locus=self.caret.locus,
274			)
275
276			def restore(self, condition):
277			"""Load current prompt condition from a Condition instance."""
278			self.text = condition.text
279			self.caret.locus = condition.caret_locus
280

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Prompt.on_keypress() A

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