247 lines
8.0 KiB
Python
247 lines
8.0 KiB
Python
|
import re
|
||
|
|
from ast import literal_eval
|
||
|
|
from operator import attrgetter
|
||
|
|
from typing import Callable, Iterable, List, Match, NamedTuple, Optional, Tuple, Union
|
||
|
|
|
||
|
|
from ._emoji_replace import _emoji_replace
|
||
|
|
from .emoji import EmojiVariant
|
||
|
|
from .errors import MarkupError
|
||
|
|
from .style import Style
|
||
|
|
from .text import Span, Text
|
||
|
|
|
||
|
|
RE_TAGS = re.compile(
|
||
|
|
r"""((\\*)\[([a-z#/@][^[]*?)])""",
|
||
|
|
re.VERBOSE,
|
||
|
|
)
|
||
|
|
|
||
|
|
RE_HANDLER = re.compile(r"^([\w.]*?)(\(.*?\))?$")
|
||
|
|
|
||
|
|
|
||
|
|
class Tag(NamedTuple):
|
||
|
|
"""A tag in console markup."""
|
||
|
|
|
||
|
|
name: str
|
||
|
|
"""The tag name. e.g. 'bold'."""
|
||
|
|
parameters: Optional[str]
|
||
|
|
"""Any additional parameters after the name."""
|
||
|
|
|
||
|
|
def __str__(self) -> str:
|
||
|
|
return (
|
||
|
|
self.name if self.parameters is None else f"{self.name} {self.parameters}"
|
||
|
|
)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def markup(self) -> str:
|
||
|
|
"""Get the string representation of this tag."""
|
||
|
|
return (
|
||
|
|
f"[{self.name}]"
|
||
|
|
if self.parameters is None
|
||
|
|
else f"[{self.name}={self.parameters}]"
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
_ReStringMatch = Match[str] # regex match object
|
||
|
|
_ReSubCallable = Callable[[_ReStringMatch], str] # Callable invoked by re.sub
|
||
|
|
_EscapeSubMethod = Callable[[_ReSubCallable, str], str] # Sub method of a compiled re
|
||
|
|
|
||
|
|
|
||
|
|
def escape(
|
||
|
|
markup: str,
|
||
|
|
_escape: _EscapeSubMethod = re.compile(r"(\\*)(\[[a-z#/@][^[]*?])").sub,
|
||
|
|
) -> str:
|
||
|
|
"""Escapes text so that it won't be interpreted as markup.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
markup (str): Content to be inserted in to markup.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
str: Markup with square brackets escaped.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def escape_backslashes(match: Match[str]) -> str:
|
||
|
|
"""Called by re.sub replace matches."""
|
||
|
|
backslashes, text = match.groups()
|
||
|
|
return f"{backslashes}{backslashes}\\{text}"
|
||
|
|
|
||
|
|
markup = _escape(escape_backslashes, markup)
|
||
|
|
return markup
|
||
|
|
|
||
|
|
|
||
|
|
def _parse(markup: str) -> Iterable[Tuple[int, Optional[str], Optional[Tag]]]:
|
||
|
|
"""Parse markup in to an iterable of tuples of (position, text, tag).
|
||
|
|
|
||
|
|
Args:
|
||
|
|
markup (str): A string containing console markup
|
||
|
|
|
||
|
|
"""
|
||
|
|
position = 0
|
||
|
|
_divmod = divmod
|
||
|
|
_Tag = Tag
|
||
|
|
for match in RE_TAGS.finditer(markup):
|
||
|
|
full_text, escapes, tag_text = match.groups()
|
||
|
|
start, end = match.span()
|
||
|
|
if start > position:
|
||
|
|
yield start, markup[position:start], None
|
||
|
|
if escapes:
|
||
|
|
backslashes, escaped = _divmod(len(escapes), 2)
|
||
|
|
if backslashes:
|
||
|
|
# Literal backslashes
|
||
|
|
yield start, "\\" * backslashes, None
|
||
|
|
start += backslashes * 2
|
||
|
|
if escaped:
|
||
|
|
# Escape of tag
|
||
|
|
yield start, full_text[len(escapes) :], None
|
||
|
|
position = end
|
||
|
|
continue
|
||
|
|
text, equals, parameters = tag_text.partition("=")
|
||
|
|
yield start, None, _Tag(text, parameters if equals else None)
|
||
|
|
position = end
|
||
|
|
if position < len(markup):
|
||
|
|
yield position, markup[position:], None
|
||
|
|
|
||
|
|
|
||
|
|
def render(
|
||
|
|
markup: str,
|
||
|
|
style: Union[str, Style] = "",
|
||
|
|
emoji: bool = True,
|
||
|
|
emoji_variant: Optional[EmojiVariant] = None,
|
||
|
|
) -> Text:
|
||
|
|
"""Render console markup in to a Text instance.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
markup (str): A string containing console markup.
|
||
|
|
emoji (bool, optional): Also render emoji code. Defaults to True.
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
MarkupError: If there is a syntax error in the markup.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
Text: A test instance.
|
||
|
|
"""
|
||
|
|
emoji_replace = _emoji_replace
|
||
|
|
if "[" not in markup:
|
||
|
|
return Text(
|
||
|
|
emoji_replace(markup, default_variant=emoji_variant) if emoji else markup,
|
||
|
|
style=style,
|
||
|
|
)
|
||
|
|
text = Text(style=style)
|
||
|
|
append = text.append
|
||
|
|
normalize = Style.normalize
|
||
|
|
|
||
|
|
style_stack: List[Tuple[int, Tag]] = []
|
||
|
|
pop = style_stack.pop
|
||
|
|
|
||
|
|
spans: List[Span] = []
|
||
|
|
append_span = spans.append
|
||
|
|
|
||
|
|
_Span = Span
|
||
|
|
_Tag = Tag
|
||
|
|
|
||
|
|
def pop_style(style_name: str) -> Tuple[int, Tag]:
|
||
|
|
"""Pop tag matching given style name."""
|
||
|
|
for index, (_, tag) in enumerate(reversed(style_stack), 1):
|
||
|
|
if tag.name == style_name:
|
||
|
|
return pop(-index)
|
||
|
|
raise KeyError(style_name)
|
||
|
|
|
||
|
|
for position, plain_text, tag in _parse(markup):
|
||
|
|
if plain_text is not None:
|
||
|
|
# Handle open brace escapes, where the brace is not part of a tag.
|
||
|
|
plain_text = plain_text.replace("\\[", "[")
|
||
|
|
append(emoji_replace(plain_text) if emoji else plain_text)
|
||
|
|
elif tag is not None:
|
||
|
|
if tag.name.startswith("/"): # Closing tag
|
||
|
|
style_name = tag.name[1:].strip()
|
||
|
|
|
||
|
|
if style_name: # explicit close
|
||
|
|
style_name = normalize(style_name)
|
||
|
|
try:
|
||
|
|
start, open_tag = pop_style(style_name)
|
||
|
|
except KeyError:
|
||
|
|
raise MarkupError(
|
||
|
|
f"closing tag '{tag.markup}' at position {position} doesn't match any open tag"
|
||
|
|
) from None
|
||
|
|
else: # implicit close
|
||
|
|
try:
|
||
|
|
start, open_tag = pop()
|
||
|
|
except IndexError:
|
||
|
|
raise MarkupError(
|
||
|
|
f"closing tag '[/]' at position {position} has nothing to close"
|
||
|
|
) from None
|
||
|
|
|
||
|
|
if open_tag.name.startswith("@"):
|
||
|
|
if open_tag.parameters:
|
||
|
|
handler_name = ""
|
||
|
|
parameters = open_tag.parameters.strip()
|
||
|
|
handler_match = RE_HANDLER.match(parameters)
|
||
|
|
if handler_match is not None:
|
||
|
|
handler_name, match_parameters = handler_match.groups()
|
||
|
|
parameters = (
|
||
|
|
"()" if match_parameters is None else match_parameters
|
||
|
|
)
|
||
|
|
|
||
|
|
try:
|
||
|
|
meta_params = literal_eval(parameters)
|
||
|
|
except SyntaxError as error:
|
||
|
|
raise MarkupError(
|
||
|
|
f"error parsing {parameters!r} in {open_tag.parameters!r}; {error.msg}"
|
||
|
|
)
|
||
|
|
except Exception as error:
|
||
|
|
raise MarkupError(
|
||
|
|
f"error parsing {open_tag.parameters!r}; {error}"
|
||
|
|
) from None
|
||
|
|
|
||
|
|
if handler_name:
|
||
|
|
meta_params = (
|
||
|
|
handler_name,
|
||
|
|
meta_params
|
||
|
|
if isinstance(meta_params, tuple)
|
||
|
|
else (meta_params,),
|
||
|
|
)
|
||
|
|
|
||
|
|
else:
|
||
|
|
meta_params = ()
|
||
|
|
|
||
|
|
append_span(
|
||
|
|
_Span(
|
||
|
|
start, len(text), Style(meta={open_tag.name: meta_params})
|
||
|
|
)
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
append_span(_Span(start, len(text), str(open_tag)))
|
||
|
|
|
||
|
|
else: # Opening tag
|
||
|
|
normalized_tag = _Tag(normalize(tag.name), tag.parameters)
|
||
|
|
style_stack.append((len(text), normalized_tag))
|
||
|
|
|
||
|
|
text_length = len(text)
|
||
|
|
while style_stack:
|
||
|
|
start, tag = style_stack.pop()
|
||
|
|
style = str(tag)
|
||
|
|
if style:
|
||
|
|
append_span(_Span(start, text_length, style))
|
||
|
|
|
||
|
|
text.spans = sorted(spans[::-1], key=attrgetter("start"))
|
||
|
|
return text
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__": # pragma: no cover
|
||
|
|
|
||
|
|
MARKUP = [
|
||
|
|
"[red]Hello World[/red]",
|
||
|
|
"[magenta]Hello [b]World[/b]",
|
||
|
|
"[bold]Bold[italic] bold and italic [/bold]italic[/italic]",
|
||
|
|
"Click [link=https://www.willmcgugan.com]here[/link] to visit my Blog",
|
||
|
|
":warning-emoji: [bold red blink] DANGER![/]",
|
||
|
|
]
|
||
|
|
|
||
|
|
from pip._vendor.rich import print
|
||
|
|
from pip._vendor.rich.table import Table
|
||
|
|
|
||
|
|
grid = Table("Markup", "Result", padding=(0, 1))
|
||
|
|
|
||
|
|
for markup in MARKUP:
|
||
|
|
grid.add_row(Text(markup), markup)
|
||
|
|
|
||
|
|
print(grid)
|