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This is preparatory work towards adding a Topic model. We plan to use the local variable name as 'topic' for the Topic model objects. Currently, we use *topic as the local variable name for topic names. We rename local variables of the form *topic to *topic_name so that we don't need to think about type collisions in individual code paths where we might want to talk about both Topic objects and strings for the topic name.
70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
import unicodedata
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from typing import Optional
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from django.utils.translation import gettext as _
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from zerver.lib.exceptions import JsonableError
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from zerver.models import Stream
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# There are 66 Unicode non-characters; see
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# https://www.unicode.org/faq/private_use.html#nonchar4
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unicode_non_chars = {
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chr(x)
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for r in [
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range(0xFDD0, 0xFDF0), # FDD0 through FDEF, inclusive
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range(0xFFFE, 0x110000, 0x10000), # 0xFFFE, 0x1FFFE, ... 0x10FFFE inclusive
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range(0xFFFF, 0x110000, 0x10000), # 0xFFFF, 0x1FFFF, ... 0x10FFFF inclusive
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]
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for x in r
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}
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def is_character_printable(char: str) -> bool:
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unicode_category = unicodedata.category(char)
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if (unicode_category in ["Cc", "Cs"]) or char in unicode_non_chars:
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return False
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return True
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def check_string_is_printable(var: str) -> Optional[int]:
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# Return position (1-indexed!) of the character which is not
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# printable, None if no such character is present.
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for i, char in enumerate(var):
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if not is_character_printable(char):
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return i + 1
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return None
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def check_stream_name(stream_name: str) -> None:
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if stream_name.strip() == "":
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raise JsonableError(_("Stream name can't be empty!"))
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if len(stream_name) > Stream.MAX_NAME_LENGTH:
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raise JsonableError(
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_("Stream name too long (limit: {max_length} characters).").format(
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max_length=Stream.MAX_NAME_LENGTH
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)
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)
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invalid_character_pos = check_string_is_printable(stream_name)
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if invalid_character_pos is not None:
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raise JsonableError(
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_("Invalid character in stream name, at position {position}!").format(
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position=invalid_character_pos
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)
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)
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def check_stream_topic(topic_name: str) -> None:
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if topic_name.strip() == "":
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raise JsonableError(_("Topic can't be empty!"))
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invalid_character_pos = check_string_is_printable(topic_name)
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if invalid_character_pos is not None:
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raise JsonableError(
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_("Invalid character in topic, at position {position}!").format(
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position=invalid_character_pos
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)
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)
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