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| author | Devtools Arcadia <arcadia-devtools@yandex-team.ru> | 2022-02-07 18:08:42 +0300 |
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| committer | Devtools Arcadia <arcadia-devtools@mous.vla.yp-c.yandex.net> | 2022-02-07 18:08:42 +0300 |
| commit | 1110808a9d39d4b808aef724c861a2e1a38d2a69 (patch) | |
| tree | e26c9fed0de5d9873cce7e00bc214573dc2195b7 /contrib/python/prompt-toolkit/py3/prompt_toolkit/formatted_text/utils.py | |
| download | ydb-1110808a9d39d4b808aef724c861a2e1a38d2a69.tar.gz | |
intermediate changes
ref:cde9a383711a11544ce7e107a78147fb96cc4029
Diffstat (limited to 'contrib/python/prompt-toolkit/py3/prompt_toolkit/formatted_text/utils.py')
| -rw-r--r-- | contrib/python/prompt-toolkit/py3/prompt_toolkit/formatted_text/utils.py | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/contrib/python/prompt-toolkit/py3/prompt_toolkit/formatted_text/utils.py b/contrib/python/prompt-toolkit/py3/prompt_toolkit/formatted_text/utils.py new file mode 100644 index 0000000000..7d48762db4 --- /dev/null +++ b/contrib/python/prompt-toolkit/py3/prompt_toolkit/formatted_text/utils.py @@ -0,0 +1,85 @@ +""" +Utilities for manipulating formatted text. + +When ``to_formatted_text`` has been called, we get a list of ``(style, text)`` +tuples. This file contains functions for manipulating such a list. +""" +from typing import Iterable, cast + +from prompt_toolkit.utils import get_cwidth + +from .base import OneStyleAndTextTuple, StyleAndTextTuples + +__all__ = [ + "fragment_list_len", + "fragment_list_width", + "fragment_list_to_text", + "split_lines", +] + + +def fragment_list_len(fragments: StyleAndTextTuples) -> int: + """ + Return the amount of characters in this text fragment list. + + :param fragments: List of ``(style_str, text)`` or + ``(style_str, text, mouse_handler)`` tuples. + """ + ZeroWidthEscape = "[ZeroWidthEscape]" + return sum(len(item[1]) for item in fragments if ZeroWidthEscape not in item[0]) + + +def fragment_list_width(fragments: StyleAndTextTuples) -> int: + """ + Return the character width of this text fragment list. + (Take double width characters into account.) + + :param fragments: List of ``(style_str, text)`` or + ``(style_str, text, mouse_handler)`` tuples. + """ + ZeroWidthEscape = "[ZeroWidthEscape]" + return sum( + get_cwidth(c) + for item in fragments + for c in item[1] + if ZeroWidthEscape not in item[0] + ) + + +def fragment_list_to_text(fragments: StyleAndTextTuples) -> str: + """ + Concatenate all the text parts again. + + :param fragments: List of ``(style_str, text)`` or + ``(style_str, text, mouse_handler)`` tuples. + """ + ZeroWidthEscape = "[ZeroWidthEscape]" + return "".join(item[1] for item in fragments if ZeroWidthEscape not in item[0]) + + +def split_lines(fragments: StyleAndTextTuples) -> Iterable[StyleAndTextTuples]: + """ + Take a single list of (style_str, text) tuples and yield one such list for each + line. Just like str.split, this will yield at least one item. + + :param fragments: List of (style_str, text) or (style_str, text, mouse_handler) + tuples. + """ + line: StyleAndTextTuples = [] + + for style, string, *mouse_handler in fragments: + parts = string.split("\n") + + for part in parts[:-1]: + if part: + line.append(cast(OneStyleAndTextTuple, (style, part, *mouse_handler))) + yield line + line = [] + + line.append(cast(OneStyleAndTextTuple, (style, parts[-1], *mouse_handler))) + + # Always yield the last line, even when this is an empty line. This ensures + # that when `fragments` ends with a newline character, an additional empty + # line is yielded. (Otherwise, there's no way to differentiate between the + # cases where `fragments` does and doesn't end with a newline.) + yield line |