diff options
Diffstat (limited to 'src/prompt_toolkit/completion')
| -rw-r--r-- | src/prompt_toolkit/completion/__init__.py | 41 | ||||
| -rw-r--r-- | src/prompt_toolkit/completion/base.py | 455 | ||||
| -rw-r--r-- | src/prompt_toolkit/completion/deduplicate.py | 43 | ||||
| -rw-r--r-- | src/prompt_toolkit/completion/filesystem.py | 117 | ||||
| -rw-r--r-- | src/prompt_toolkit/completion/fuzzy_completer.py | 213 | ||||
| -rw-r--r-- | src/prompt_toolkit/completion/nested.py | 107 | ||||
| -rw-r--r-- | src/prompt_toolkit/completion/word_completer.py | 93 |
7 files changed, 1069 insertions, 0 deletions
diff --git a/src/prompt_toolkit/completion/__init__.py b/src/prompt_toolkit/completion/__init__.py new file mode 100644 index 0000000..270c743 --- /dev/null +++ b/src/prompt_toolkit/completion/__init__.py @@ -0,0 +1,41 @@ +from .base import ( + CompleteEvent, + Completer, + Completion, + ConditionalCompleter, + DummyCompleter, + DynamicCompleter, + ThreadedCompleter, + get_common_complete_suffix, + merge_completers, +) +from .deduplicate import DeduplicateCompleter +from .filesystem import ExecutableCompleter, PathCompleter +from .fuzzy_completer import FuzzyCompleter, FuzzyWordCompleter +from .nested import NestedCompleter +from .word_completer import WordCompleter + +__all__ = [ + # Base. + "Completion", + "Completer", + "ThreadedCompleter", + "DummyCompleter", + "DynamicCompleter", + "CompleteEvent", + "ConditionalCompleter", + "merge_completers", + "get_common_complete_suffix", + # Filesystem. + "PathCompleter", + "ExecutableCompleter", + # Fuzzy + "FuzzyCompleter", + "FuzzyWordCompleter", + # Nested. + "NestedCompleter", + # Word completer. + "WordCompleter", + # Deduplicate + "DeduplicateCompleter", +] diff --git a/src/prompt_toolkit/completion/base.py b/src/prompt_toolkit/completion/base.py new file mode 100644 index 0000000..bd575ec --- /dev/null +++ b/src/prompt_toolkit/completion/base.py @@ -0,0 +1,455 @@ +""" +""" +from abc import ABCMeta, abstractmethod +from typing import AsyncGenerator, Callable, Iterable, List, Optional, Sequence + +from prompt_toolkit.document import Document +from prompt_toolkit.eventloop import ( + aclosing, + generator_to_async_generator, + get_event_loop, +) +from prompt_toolkit.filters import FilterOrBool, to_filter +from prompt_toolkit.formatted_text import AnyFormattedText, StyleAndTextTuples + +__all__ = [ + "Completion", + "Completer", + "ThreadedCompleter", + "DummyCompleter", + "DynamicCompleter", + "CompleteEvent", + "ConditionalCompleter", + "merge_completers", + "get_common_complete_suffix", +] + + +class Completion: + """ + :param text: The new string that will be inserted into the document. + :param start_position: Position relative to the cursor_position where the + new text will start. The text will be inserted between the + start_position and the original cursor position. + :param display: (optional string or formatted text) If the completion has + to be displayed differently in the completion menu. + :param display_meta: (Optional string or formatted text) Meta information + about the completion, e.g. the path or source where it's coming from. + This can also be a callable that returns a string. + :param style: Style string. + :param selected_style: Style string, used for a selected completion. + This can override the `style` parameter. + """ + + def __init__( + self, + text: str, + start_position: int = 0, + display: Optional[AnyFormattedText] = None, + display_meta: Optional[AnyFormattedText] = None, + style: str = "", + selected_style: str = "", + ) -> None: + + from prompt_toolkit.formatted_text import to_formatted_text + + self.text = text + self.start_position = start_position + self._display_meta = display_meta + + if display is None: + display = text + + self.display = to_formatted_text(display) + + self.style = style + self.selected_style = selected_style + + assert self.start_position <= 0 + + def __repr__(self) -> str: + if isinstance(self.display, str) and self.display == self.text: + return "{}(text={!r}, start_position={!r})".format( + self.__class__.__name__, + self.text, + self.start_position, + ) + else: + return "{}(text={!r}, start_position={!r}, display={!r})".format( + self.__class__.__name__, + self.text, + self.start_position, + self.display, + ) + + def __eq__(self, other: object) -> bool: + if not isinstance(other, Completion): + return False + return ( + self.text == other.text + and self.start_position == other.start_position + and self.display == other.display + and self._display_meta == other._display_meta + ) + + def __hash__(self) -> int: + return hash((self.text, self.start_position, self.display, self._display_meta)) + + @property + def display_text(self) -> str: + "The 'display' field as plain text." + from prompt_toolkit.formatted_text import fragment_list_to_text + + return fragment_list_to_text(self.display) + + @property + def display_meta(self) -> StyleAndTextTuples: + "Return meta-text. (This is lazy when using a callable)." + from prompt_toolkit.formatted_text import to_formatted_text + + return to_formatted_text(self._display_meta or "") + + @property + def display_meta_text(self) -> str: + "The 'meta' field as plain text." + from prompt_toolkit.formatted_text import fragment_list_to_text + + return fragment_list_to_text(self.display_meta) + + def new_completion_from_position(self, position: int) -> "Completion": + """ + (Only for internal use!) + Get a new completion by splitting this one. Used by `Application` when + it needs to have a list of new completions after inserting the common + prefix. + """ + assert position - self.start_position >= 0 + + return Completion( + text=self.text[position - self.start_position :], + display=self.display, + display_meta=self._display_meta, + ) + + +class CompleteEvent: + """ + Event that called the completer. + + :param text_inserted: When True, it means that completions are requested + because of a text insert. (`Buffer.complete_while_typing`.) + :param completion_requested: When True, it means that the user explicitly + pressed the `Tab` key in order to view the completions. + + These two flags can be used for instance to implement a completer that + shows some completions when ``Tab`` has been pressed, but not + automatically when the user presses a space. (Because of + `complete_while_typing`.) + """ + + def __init__( + self, text_inserted: bool = False, completion_requested: bool = False + ) -> None: + assert not (text_inserted and completion_requested) + + #: Automatic completion while typing. + self.text_inserted = text_inserted + + #: Used explicitly requested completion by pressing 'tab'. + self.completion_requested = completion_requested + + def __repr__(self) -> str: + return "{}(text_inserted={!r}, completion_requested={!r})".format( + self.__class__.__name__, + self.text_inserted, + self.completion_requested, + ) + + +class Completer(metaclass=ABCMeta): + """ + Base class for completer implementations. + """ + + @abstractmethod + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + """ + This should be a generator that yields :class:`.Completion` instances. + + If the generation of completions is something expensive (that takes a + lot of time), consider wrapping this `Completer` class in a + `ThreadedCompleter`. In that case, the completer algorithm runs in a + background thread and completions will be displayed as soon as they + arrive. + + :param document: :class:`~prompt_toolkit.document.Document` instance. + :param complete_event: :class:`.CompleteEvent` instance. + """ + while False: + yield + + async def get_completions_async( + self, document: Document, complete_event: CompleteEvent + ) -> AsyncGenerator[Completion, None]: + """ + Asynchronous generator for completions. (Probably, you won't have to + override this.) + + Asynchronous generator of :class:`.Completion` objects. + """ + for item in self.get_completions(document, complete_event): + yield item + + +class ThreadedCompleter(Completer): + """ + Wrapper that runs the `get_completions` generator in a thread. + + (Use this to prevent the user interface from becoming unresponsive if the + generation of completions takes too much time.) + + The completions will be displayed as soon as they are produced. The user + can already select a completion, even if not all completions are displayed. + """ + + def __init__(self, completer: Completer) -> None: + self.completer = completer + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + return self.completer.get_completions(document, complete_event) + + async def get_completions_async( + self, document: Document, complete_event: CompleteEvent + ) -> AsyncGenerator[Completion, None]: + """ + Asynchronous generator of completions. + """ + # NOTE: Right now, we are consuming the `get_completions` generator in + # a synchronous background thread, then passing the results one + # at a time over a queue, and consuming this queue in the main + # thread (that's what `generator_to_async_generator` does). That + # means that if the completer is *very* slow, we'll be showing + # completions in the UI once they are computed. + + # It's very tempting to replace this implementation with the + # commented code below for several reasons: + + # - `generator_to_async_generator` is not perfect and hard to get + # right. It's a lot of complexity for little gain. The + # implementation needs a huge buffer for it to be efficient + # when there are many completions (like 50k+). + # - Normally, a completer is supposed to be fast, users can have + # "complete while typing" enabled, and want to see the + # completions within a second. Handling one completion at a + # time, and rendering once we get it here doesn't make any + # sense if this is quick anyway. + # - Completers like `FuzzyCompleter` prepare all completions + # anyway so that they can be sorted by accuracy before they are + # yielded. At the point that we start yielding completions + # here, we already have all completions. + # - The `Buffer` class has complex logic to invalidate the UI + # while it is consuming the completions. We don't want to + # invalidate the UI for every completion (if there are many), + # but we want to do it often enough so that completions are + # being displayed while they are produced. + + # We keep the current behavior mainly for backward-compatibility. + # Similarly, it would be better for this function to not return + # an async generator, but simply be a coroutine that returns a + # list of `Completion` objects, containing all completions at + # once. + + # Note that this argument doesn't mean we shouldn't use + # `ThreadedCompleter`. It still makes sense to produce + # completions in a background thread, because we don't want to + # freeze the UI while the user is typing. But sending the + # completions one at a time to the UI maybe isn't worth it. + + # def get_all_in_thread() -> List[Completion]: + # return list(self.get_completions(document, complete_event)) + + # completions = await get_event_loop().run_in_executor(None, get_all_in_thread) + # for completion in completions: + # yield completion + + async with aclosing( + generator_to_async_generator( + lambda: self.completer.get_completions(document, complete_event) + ) + ) as async_generator: + async for completion in async_generator: + yield completion + + def __repr__(self) -> str: + return f"ThreadedCompleter({self.completer!r})" + + +class DummyCompleter(Completer): + """ + A completer that doesn't return any completion. + """ + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + return [] + + def __repr__(self) -> str: + return "DummyCompleter()" + + +class DynamicCompleter(Completer): + """ + Completer class that can dynamically returns any Completer. + + :param get_completer: Callable that returns a :class:`.Completer` instance. + """ + + def __init__(self, get_completer: Callable[[], Optional[Completer]]) -> None: + self.get_completer = get_completer + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + completer = self.get_completer() or DummyCompleter() + return completer.get_completions(document, complete_event) + + async def get_completions_async( + self, document: Document, complete_event: CompleteEvent + ) -> AsyncGenerator[Completion, None]: + completer = self.get_completer() or DummyCompleter() + + async for completion in completer.get_completions_async( + document, complete_event + ): + yield completion + + def __repr__(self) -> str: + return f"DynamicCompleter({self.get_completer!r} -> {self.get_completer()!r})" + + +class ConditionalCompleter(Completer): + """ + Wrapper around any other completer that will enable/disable the completions + depending on whether the received condition is satisfied. + + :param completer: :class:`.Completer` instance. + :param filter: :class:`.Filter` instance. + """ + + def __init__(self, completer: Completer, filter: FilterOrBool) -> None: + self.completer = completer + self.filter = to_filter(filter) + + def __repr__(self) -> str: + return f"ConditionalCompleter({self.completer!r}, filter={self.filter!r})" + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + # Get all completions in a blocking way. + if self.filter(): + yield from self.completer.get_completions(document, complete_event) + + async def get_completions_async( + self, document: Document, complete_event: CompleteEvent + ) -> AsyncGenerator[Completion, None]: + + # Get all completions in a non-blocking way. + if self.filter(): + async with aclosing( + self.completer.get_completions_async(document, complete_event) + ) as async_generator: + async for item in async_generator: + yield item + + +class _MergedCompleter(Completer): + """ + Combine several completers into one. + """ + + def __init__(self, completers: Sequence[Completer]) -> None: + self.completers = completers + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + # Get all completions from the other completers in a blocking way. + for completer in self.completers: + yield from completer.get_completions(document, complete_event) + + async def get_completions_async( + self, document: Document, complete_event: CompleteEvent + ) -> AsyncGenerator[Completion, None]: + + # Get all completions from the other completers in a non-blocking way. + for completer in self.completers: + async with aclosing( + completer.get_completions_async(document, complete_event) + ) as async_generator: + async for item in async_generator: + yield item + + +def merge_completers( + completers: Sequence[Completer], deduplicate: bool = False +) -> Completer: + """ + Combine several completers into one. + + :param deduplicate: If `True`, wrap the result in a `DeduplicateCompleter` + so that completions that would result in the same text will be + deduplicated. + """ + if deduplicate: + from .deduplicate import DeduplicateCompleter + + return DeduplicateCompleter(_MergedCompleter(completers)) + + return _MergedCompleter(completers) + + +def get_common_complete_suffix( + document: Document, completions: Sequence[Completion] +) -> str: + """ + Return the common prefix for all completions. + """ + # Take only completions that don't change the text before the cursor. + def doesnt_change_before_cursor(completion: Completion) -> bool: + end = completion.text[: -completion.start_position] + return document.text_before_cursor.endswith(end) + + completions2 = [c for c in completions if doesnt_change_before_cursor(c)] + + # When there is at least one completion that changes the text before the + # cursor, don't return any common part. + if len(completions2) != len(completions): + return "" + + # Return the common prefix. + def get_suffix(completion: Completion) -> str: + return completion.text[-completion.start_position :] + + return _commonprefix([get_suffix(c) for c in completions2]) + + +def _commonprefix(strings: Iterable[str]) -> str: + # Similar to os.path.commonprefix + if not strings: + return "" + + else: + s1 = min(strings) + s2 = max(strings) + + for i, c in enumerate(s1): + if c != s2[i]: + return s1[:i] + + return s1 diff --git a/src/prompt_toolkit/completion/deduplicate.py b/src/prompt_toolkit/completion/deduplicate.py new file mode 100644 index 0000000..6ef9522 --- /dev/null +++ b/src/prompt_toolkit/completion/deduplicate.py @@ -0,0 +1,43 @@ +from typing import Iterable, Set + +from prompt_toolkit.document import Document + +from .base import CompleteEvent, Completer, Completion + +__all__ = ["DeduplicateCompleter"] + + +class DeduplicateCompleter(Completer): + """ + Wrapper around a completer that removes duplicates. Only the first unique + completions are kept. + + Completions are considered to be a duplicate if they result in the same + document text when they would be applied. + """ + + def __init__(self, completer: Completer) -> None: + self.completer = completer + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + # Keep track of the document strings we'd get after applying any completion. + found_so_far: Set[str] = set() + + for completion in self.completer.get_completions(document, complete_event): + text_if_applied = ( + document.text[: document.cursor_position + completion.start_position] + + completion.text + + document.text[document.cursor_position :] + ) + + if text_if_applied == document.text: + # Don't include completions that don't have any effect at all. + continue + + if text_if_applied in found_so_far: + continue + + found_so_far.add(text_if_applied) + yield completion diff --git a/src/prompt_toolkit/completion/filesystem.py b/src/prompt_toolkit/completion/filesystem.py new file mode 100644 index 0000000..719eac6 --- /dev/null +++ b/src/prompt_toolkit/completion/filesystem.py @@ -0,0 +1,117 @@ +import os +from typing import Callable, Iterable, List, Optional + +from prompt_toolkit.completion import CompleteEvent, Completer, Completion +from prompt_toolkit.document import Document + +__all__ = [ + "PathCompleter", + "ExecutableCompleter", +] + + +class PathCompleter(Completer): + """ + Complete for Path variables. + + :param get_paths: Callable which returns a list of directories to look into + when the user enters a relative path. + :param file_filter: Callable which takes a filename and returns whether + this file should show up in the completion. ``None`` + when no filtering has to be done. + :param min_input_len: Don't do autocompletion when the input string is shorter. + """ + + def __init__( + self, + only_directories: bool = False, + get_paths: Optional[Callable[[], List[str]]] = None, + file_filter: Optional[Callable[[str], bool]] = None, + min_input_len: int = 0, + expanduser: bool = False, + ) -> None: + + self.only_directories = only_directories + self.get_paths = get_paths or (lambda: ["."]) + self.file_filter = file_filter or (lambda _: True) + self.min_input_len = min_input_len + self.expanduser = expanduser + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + text = document.text_before_cursor + + # Complete only when we have at least the minimal input length, + # otherwise, we can too many results and autocompletion will become too + # heavy. + if len(text) < self.min_input_len: + return + + try: + # Do tilde expansion. + if self.expanduser: + text = os.path.expanduser(text) + + # Directories where to look. + dirname = os.path.dirname(text) + if dirname: + directories = [ + os.path.dirname(os.path.join(p, text)) for p in self.get_paths() + ] + else: + directories = self.get_paths() + + # Start of current file. + prefix = os.path.basename(text) + + # Get all filenames. + filenames = [] + for directory in directories: + # Look for matches in this directory. + if os.path.isdir(directory): + for filename in os.listdir(directory): + if filename.startswith(prefix): + filenames.append((directory, filename)) + + # Sort + filenames = sorted(filenames, key=lambda k: k[1]) + + # Yield them. + for directory, filename in filenames: + completion = filename[len(prefix) :] + full_name = os.path.join(directory, filename) + + if os.path.isdir(full_name): + # For directories, add a slash to the filename. + # (We don't add them to the `completion`. Users can type it + # to trigger the autocompletion themselves.) + filename += "/" + elif self.only_directories: + continue + + if not self.file_filter(full_name): + continue + + yield Completion( + text=completion, + start_position=0, + display=filename, + ) + except OSError: + pass + + +class ExecutableCompleter(PathCompleter): + """ + Complete only executable files in the current path. + """ + + def __init__(self) -> None: + super().__init__( + only_directories=False, + min_input_len=1, + get_paths=lambda: os.environ.get("PATH", "").split(os.pathsep), + file_filter=lambda name: os.access(name, os.X_OK), + expanduser=True, + ), diff --git a/src/prompt_toolkit/completion/fuzzy_completer.py b/src/prompt_toolkit/completion/fuzzy_completer.py new file mode 100644 index 0000000..ab5402f --- /dev/null +++ b/src/prompt_toolkit/completion/fuzzy_completer.py @@ -0,0 +1,213 @@ +import re +from typing import Callable, Dict, Iterable, List, NamedTuple, Optional, Tuple, Union + +from prompt_toolkit.document import Document +from prompt_toolkit.filters import FilterOrBool, to_filter +from prompt_toolkit.formatted_text import AnyFormattedText, StyleAndTextTuples + +from .base import CompleteEvent, Completer, Completion +from .word_completer import WordCompleter + +__all__ = [ + "FuzzyCompleter", + "FuzzyWordCompleter", +] + + +class FuzzyCompleter(Completer): + """ + Fuzzy completion. + This wraps any other completer and turns it into a fuzzy completer. + + If the list of words is: ["leopard" , "gorilla", "dinosaur", "cat", "bee"] + Then trying to complete "oar" would yield "leopard" and "dinosaur", but not + the others, because they match the regular expression 'o.*a.*r'. + Similar, in another application "djm" could expand to "django_migrations". + + The results are sorted by relevance, which is defined as the start position + and the length of the match. + + Notice that this is not really a tool to work around spelling mistakes, + like what would be possible with difflib. The purpose is rather to have a + quicker or more intuitive way to filter the given completions, especially + when many completions have a common prefix. + + Fuzzy algorithm is based on this post: + https://blog.amjith.com/fuzzyfinder-in-10-lines-of-python + + :param completer: A :class:`~.Completer` instance. + :param WORD: When True, use WORD characters. + :param pattern: Regex pattern which selects the characters before the + cursor that are considered for the fuzzy matching. + :param enable_fuzzy: (bool or `Filter`) Enabled the fuzzy behavior. For + easily turning fuzzyness on or off according to a certain condition. + """ + + def __init__( + self, + completer: Completer, + WORD: bool = False, + pattern: Optional[str] = None, + enable_fuzzy: FilterOrBool = True, + ) -> None: + + assert pattern is None or pattern.startswith("^") + + self.completer = completer + self.pattern = pattern + self.WORD = WORD + self.pattern = pattern + self.enable_fuzzy = to_filter(enable_fuzzy) + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + if self.enable_fuzzy(): + return self._get_fuzzy_completions(document, complete_event) + else: + return self.completer.get_completions(document, complete_event) + + def _get_pattern(self) -> str: + if self.pattern: + return self.pattern + if self.WORD: + return r"[^\s]+" + return "^[a-zA-Z0-9_]*" + + def _get_fuzzy_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + word_before_cursor = document.get_word_before_cursor( + pattern=re.compile(self._get_pattern()) + ) + + # Get completions + document2 = Document( + text=document.text[: document.cursor_position - len(word_before_cursor)], + cursor_position=document.cursor_position - len(word_before_cursor), + ) + + inner_completions = list( + self.completer.get_completions(document2, complete_event) + ) + + fuzzy_matches: List[_FuzzyMatch] = [] + + if word_before_cursor == "": + # If word before the cursor is an empty string, consider all + # completions, without filtering everything with an empty regex + # pattern. + fuzzy_matches = [_FuzzyMatch(0, 0, compl) for compl in inner_completions] + else: + pat = ".*?".join(map(re.escape, word_before_cursor)) + pat = f"(?=({pat}))" # lookahead regex to manage overlapping matches + regex = re.compile(pat, re.IGNORECASE) + for compl in inner_completions: + matches = list(regex.finditer(compl.text)) + if matches: + # Prefer the match, closest to the left, then shortest. + best = min(matches, key=lambda m: (m.start(), len(m.group(1)))) + fuzzy_matches.append( + _FuzzyMatch(len(best.group(1)), best.start(), compl) + ) + + def sort_key(fuzzy_match: "_FuzzyMatch") -> Tuple[int, int]: + "Sort by start position, then by the length of the match." + return fuzzy_match.start_pos, fuzzy_match.match_length + + fuzzy_matches = sorted(fuzzy_matches, key=sort_key) + + for match in fuzzy_matches: + # Include these completions, but set the correct `display` + # attribute and `start_position`. + yield Completion( + text=match.completion.text, + start_position=match.completion.start_position + - len(word_before_cursor), + # We access to private `_display_meta` attribute, because that one is lazy. + display_meta=match.completion._display_meta, + display=self._get_display(match, word_before_cursor), + style=match.completion.style, + ) + + def _get_display( + self, fuzzy_match: "_FuzzyMatch", word_before_cursor: str + ) -> AnyFormattedText: + """ + Generate formatted text for the display label. + """ + + def get_display() -> AnyFormattedText: + m = fuzzy_match + word = m.completion.text + + if m.match_length == 0: + # No highlighting when we have zero length matches (no input text). + # In this case, use the original display text (which can include + # additional styling or characters). + return m.completion.display + + result: StyleAndTextTuples = [] + + # Text before match. + result.append(("class:fuzzymatch.outside", word[: m.start_pos])) + + # The match itself. + characters = list(word_before_cursor) + + for c in word[m.start_pos : m.start_pos + m.match_length]: + classname = "class:fuzzymatch.inside" + if characters and c.lower() == characters[0].lower(): + classname += ".character" + del characters[0] + + result.append((classname, c)) + + # Text after match. + result.append( + ("class:fuzzymatch.outside", word[m.start_pos + m.match_length :]) + ) + + return result + + return get_display() + + +class FuzzyWordCompleter(Completer): + """ + Fuzzy completion on a list of words. + + (This is basically a `WordCompleter` wrapped in a `FuzzyCompleter`.) + + :param words: List of words or callable that returns a list of words. + :param meta_dict: Optional dict mapping words to their meta-information. + :param WORD: When True, use WORD characters. + """ + + def __init__( + self, + words: Union[List[str], Callable[[], List[str]]], + meta_dict: Optional[Dict[str, str]] = None, + WORD: bool = False, + ) -> None: + + self.words = words + self.meta_dict = meta_dict or {} + self.WORD = WORD + + self.word_completer = WordCompleter( + words=self.words, WORD=self.WORD, meta_dict=self.meta_dict + ) + + self.fuzzy_completer = FuzzyCompleter(self.word_completer, WORD=self.WORD) + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + return self.fuzzy_completer.get_completions(document, complete_event) + + +class _FuzzyMatch(NamedTuple): + match_length: int + start_pos: int + completion: Completion diff --git a/src/prompt_toolkit/completion/nested.py b/src/prompt_toolkit/completion/nested.py new file mode 100644 index 0000000..f8656b2 --- /dev/null +++ b/src/prompt_toolkit/completion/nested.py @@ -0,0 +1,107 @@ +""" +Nestedcompleter for completion of hierarchical data structures. +""" +from typing import Any, Dict, Iterable, Mapping, Optional, Set, Union + +from prompt_toolkit.completion import CompleteEvent, Completer, Completion +from prompt_toolkit.completion.word_completer import WordCompleter +from prompt_toolkit.document import Document + +__all__ = ["NestedCompleter"] + +# NestedDict = Mapping[str, Union['NestedDict', Set[str], None, Completer]] +NestedDict = Mapping[str, Union[Any, Set[str], None, Completer]] + + +class NestedCompleter(Completer): + """ + Completer which wraps around several other completers, and calls any the + one that corresponds with the first word of the input. + + By combining multiple `NestedCompleter` instances, we can achieve multiple + hierarchical levels of autocompletion. This is useful when `WordCompleter` + is not sufficient. + + If you need multiple levels, check out the `from_nested_dict` classmethod. + """ + + def __init__( + self, options: Dict[str, Optional[Completer]], ignore_case: bool = True + ) -> None: + + self.options = options + self.ignore_case = ignore_case + + def __repr__(self) -> str: + return f"NestedCompleter({self.options!r}, ignore_case={self.ignore_case!r})" + + @classmethod + def from_nested_dict(cls, data: NestedDict) -> "NestedCompleter": + """ + Create a `NestedCompleter`, starting from a nested dictionary data + structure, like this: + + .. code:: + + data = { + 'show': { + 'version': None, + 'interfaces': None, + 'clock': None, + 'ip': {'interface': {'brief'}} + }, + 'exit': None + 'enable': None + } + + The value should be `None` if there is no further completion at some + point. If all values in the dictionary are None, it is also possible to + use a set instead. + + Values in this data structure can be a completers as well. + """ + options: Dict[str, Optional[Completer]] = {} + for key, value in data.items(): + if isinstance(value, Completer): + options[key] = value + elif isinstance(value, dict): + options[key] = cls.from_nested_dict(value) + elif isinstance(value, set): + options[key] = cls.from_nested_dict({item: None for item in value}) + else: + assert value is None + options[key] = None + + return cls(options) + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + # Split document. + text = document.text_before_cursor.lstrip() + stripped_len = len(document.text_before_cursor) - len(text) + + # If there is a space, check for the first term, and use a + # subcompleter. + if " " in text: + first_term = text.split()[0] + completer = self.options.get(first_term) + + # If we have a sub completer, use this for the completions. + if completer is not None: + remaining_text = text[len(first_term) :].lstrip() + move_cursor = len(text) - len(remaining_text) + stripped_len + + new_document = Document( + remaining_text, + cursor_position=document.cursor_position - move_cursor, + ) + + yield from completer.get_completions(new_document, complete_event) + + # No space in the input: behave exactly like `WordCompleter`. + else: + completer = WordCompleter( + list(self.options.keys()), ignore_case=self.ignore_case + ) + yield from completer.get_completions(document, complete_event) diff --git a/src/prompt_toolkit/completion/word_completer.py b/src/prompt_toolkit/completion/word_completer.py new file mode 100644 index 0000000..28c133e --- /dev/null +++ b/src/prompt_toolkit/completion/word_completer.py @@ -0,0 +1,93 @@ +from typing import Callable, Iterable, List, Mapping, Optional, Pattern, Union + +from prompt_toolkit.completion import CompleteEvent, Completer, Completion +from prompt_toolkit.document import Document +from prompt_toolkit.formatted_text import AnyFormattedText + +__all__ = [ + "WordCompleter", +] + + +class WordCompleter(Completer): + """ + Simple autocompletion on a list of words. + + :param words: List of words or callable that returns a list of words. + :param ignore_case: If True, case-insensitive completion. + :param meta_dict: Optional dict mapping words to their meta-text. (This + should map strings to strings or formatted text.) + :param WORD: When True, use WORD characters. + :param sentence: When True, don't complete by comparing the word before the + cursor, but by comparing all the text before the cursor. In this case, + the list of words is just a list of strings, where each string can + contain spaces. (Can not be used together with the WORD option.) + :param match_middle: When True, match not only the start, but also in the + middle of the word. + :param pattern: Optional compiled regex for finding the word before + the cursor to complete. When given, use this regex pattern instead of + default one (see document._FIND_WORD_RE) + """ + + def __init__( + self, + words: Union[List[str], Callable[[], List[str]]], + ignore_case: bool = False, + display_dict: Optional[Mapping[str, AnyFormattedText]] = None, + meta_dict: Optional[Mapping[str, AnyFormattedText]] = None, + WORD: bool = False, + sentence: bool = False, + match_middle: bool = False, + pattern: Optional[Pattern[str]] = None, + ) -> None: + + assert not (WORD and sentence) + + self.words = words + self.ignore_case = ignore_case + self.display_dict = display_dict or {} + self.meta_dict = meta_dict or {} + self.WORD = WORD + self.sentence = sentence + self.match_middle = match_middle + self.pattern = pattern + + def get_completions( + self, document: Document, complete_event: CompleteEvent + ) -> Iterable[Completion]: + # Get list of words. + words = self.words + if callable(words): + words = words() + + # Get word/text before cursor. + if self.sentence: + word_before_cursor = document.text_before_cursor + else: + word_before_cursor = document.get_word_before_cursor( + WORD=self.WORD, pattern=self.pattern + ) + + if self.ignore_case: + word_before_cursor = word_before_cursor.lower() + + def word_matches(word: str) -> bool: + """True when the word before the cursor matches.""" + if self.ignore_case: + word = word.lower() + + if self.match_middle: + return word_before_cursor in word + else: + return word.startswith(word_before_cursor) + + for a in words: + if word_matches(a): + display = self.display_dict.get(a, a) + display_meta = self.meta_dict.get(a, "") + yield Completion( + text=a, + start_position=-len(word_before_cursor), + display=display, + display_meta=display_meta, + ) |