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bazarr/libs/rich/syntax.py

736 lines
26 KiB

import os.path
import platform
from rich.containers import Lines
import textwrap
from abc import ABC, abstractmethod
from typing import Any, Dict, Iterable, List, Optional, Set, Tuple, Type, Union
from pygments.lexer import Lexer
from pygments.lexers import get_lexer_by_name, guess_lexer_for_filename
from pygments.style import Style as PygmentsStyle
from pygments.styles import get_style_by_name
from pygments.token import (
Comment,
Error,
Generic,
Keyword,
Name,
Number,
Operator,
String,
Token,
Whitespace,
)
from pygments.util import ClassNotFound
from ._loop import loop_first
from .color import Color, blend_rgb
from .console import Console, ConsoleOptions, JustifyMethod, RenderResult
from .jupyter import JupyterMixin
from .measure import Measurement
from .segment import Segment
from .style import Style
from .text import Text
TokenType = Tuple[str, ...]
WINDOWS = platform.system() == "Windows"
DEFAULT_THEME = "monokai"
# The following styles are based on https://github.com/pygments/pygments/blob/master/pygments/formatters/terminal.py
# A few modifications were made
ANSI_LIGHT: Dict[TokenType, Style] = {
Token: Style(),
Whitespace: Style(color="white"),
Comment: Style(dim=True),
Comment.Preproc: Style(color="cyan"),
Keyword: Style(color="blue"),
Keyword.Type: Style(color="cyan"),
Operator.Word: Style(color="magenta"),
Name.Builtin: Style(color="cyan"),
Name.Function: Style(color="green"),
Name.Namespace: Style(color="cyan", underline=True),
Name.Class: Style(color="green", underline=True),
Name.Exception: Style(color="cyan"),
Name.Decorator: Style(color="magenta", bold=True),
Name.Variable: Style(color="red"),
Name.Constant: Style(color="red"),
Name.Attribute: Style(color="cyan"),
Name.Tag: Style(color="bright_blue"),
String: Style(color="yellow"),
Number: Style(color="blue"),
Generic.Deleted: Style(color="bright_red"),
Generic.Inserted: Style(color="green"),
Generic.Heading: Style(bold=True),
Generic.Subheading: Style(color="magenta", bold=True),
Generic.Prompt: Style(bold=True),
Generic.Error: Style(color="bright_red"),
Error: Style(color="red", underline=True),
}
ANSI_DARK: Dict[TokenType, Style] = {
Token: Style(),
Whitespace: Style(color="bright_black"),
Comment: Style(dim=True),
Comment.Preproc: Style(color="bright_cyan"),
Keyword: Style(color="bright_blue"),
Keyword.Type: Style(color="bright_cyan"),
Operator.Word: Style(color="bright_magenta"),
Name.Builtin: Style(color="bright_cyan"),
Name.Function: Style(color="bright_green"),
Name.Namespace: Style(color="bright_cyan", underline=True),
Name.Class: Style(color="bright_green", underline=True),
Name.Exception: Style(color="bright_cyan"),
Name.Decorator: Style(color="bright_magenta", bold=True),
Name.Variable: Style(color="bright_red"),
Name.Constant: Style(color="bright_red"),
Name.Attribute: Style(color="bright_cyan"),
Name.Tag: Style(color="bright_blue"),
String: Style(color="yellow"),
Number: Style(color="bright_blue"),
Generic.Deleted: Style(color="bright_red"),
Generic.Inserted: Style(color="bright_green"),
Generic.Heading: Style(bold=True),
Generic.Subheading: Style(color="bright_magenta", bold=True),
Generic.Prompt: Style(bold=True),
Generic.Error: Style(color="bright_red"),
Error: Style(color="red", underline=True),
}
RICH_SYNTAX_THEMES = {"ansi_light": ANSI_LIGHT, "ansi_dark": ANSI_DARK}
class SyntaxTheme(ABC):
"""Base class for a syntax theme."""
@abstractmethod
def get_style_for_token(self, token_type: TokenType) -> Style:
"""Get a style for a given Pygments token."""
raise NotImplementedError # pragma: no cover
@abstractmethod
def get_background_style(self) -> Style:
"""Get the background color."""
raise NotImplementedError # pragma: no cover
class PygmentsSyntaxTheme(SyntaxTheme):
"""Syntax theme that delegates to Pygments theme."""
def __init__(self, theme: Union[str, Type[PygmentsStyle]]) -> None:
self._style_cache: Dict[TokenType, Style] = {}
if isinstance(theme, str):
try:
self._pygments_style_class = get_style_by_name(theme)
except ClassNotFound:
self._pygments_style_class = get_style_by_name("default")
else:
self._pygments_style_class = theme
self._background_color = self._pygments_style_class.background_color
self._background_style = Style(bgcolor=self._background_color)
def get_style_for_token(self, token_type: TokenType) -> Style:
"""Get a style from a Pygments class."""
try:
return self._style_cache[token_type]
except KeyError:
try:
pygments_style = self._pygments_style_class.style_for_token(token_type)
except KeyError:
style = Style.null()
else:
color = pygments_style["color"]
bgcolor = pygments_style["bgcolor"]
style = Style(
color="#" + color if color else "#000000",
bgcolor="#" + bgcolor if bgcolor else self._background_color,
bold=pygments_style["bold"],
italic=pygments_style["italic"],
underline=pygments_style["underline"],
)
self._style_cache[token_type] = style
return style
def get_background_style(self) -> Style:
return self._background_style
class ANSISyntaxTheme(SyntaxTheme):
"""Syntax theme to use standard colors."""
def __init__(self, style_map: Dict[TokenType, Style]) -> None:
self.style_map = style_map
self._missing_style = Style.null()
self._background_style = Style.null()
self._style_cache: Dict[TokenType, Style] = {}
def get_style_for_token(self, token_type: TokenType) -> Style:
"""Look up style in the style map."""
try:
return self._style_cache[token_type]
except KeyError:
# Styles form a hierarchy
# We need to go from most to least specific
# e.g. ("foo", "bar", "baz") to ("foo", "bar") to ("foo",)
get_style = self.style_map.get
token = tuple(token_type)
style = self._missing_style
while token:
_style = get_style(token)
if _style is not None:
style = _style
break
token = token[:-1]
self._style_cache[token_type] = style
return style
def get_background_style(self) -> Style:
return self._background_style
class Syntax(JupyterMixin):
"""Construct a Syntax object to render syntax highlighted code.
Args:
code (str): Code to highlight.
lexer (Lexer | str): Lexer to use (see https://pygments.org/docs/lexers/)
theme (str, optional): Color theme, aka Pygments style (see https://pygments.org/docs/styles/#getting-a-list-of-available-styles). Defaults to "monokai".
dedent (bool, optional): Enable stripping of initial whitespace. Defaults to False.
line_numbers (bool, optional): Enable rendering of line numbers. Defaults to False.
start_line (int, optional): Starting number for line numbers. Defaults to 1.
line_range (Tuple[int, int], optional): If given should be a tuple of the start and end line to render.
highlight_lines (Set[int]): A set of line numbers to highlight.
code_width: Width of code to render (not including line numbers), or ``None`` to use all available width.
tab_size (int, optional): Size of tabs. Defaults to 4.
word_wrap (bool, optional): Enable word wrapping.
background_color (str, optional): Optional background color, or None to use theme color. Defaults to None.
indent_guides (bool, optional): Show indent guides. Defaults to False.
"""
_pygments_style_class: Type[PygmentsStyle]
_theme: SyntaxTheme
@classmethod
def get_theme(cls, name: Union[str, SyntaxTheme]) -> SyntaxTheme:
"""Get a syntax theme instance."""
if isinstance(name, SyntaxTheme):
return name
theme: SyntaxTheme
if name in RICH_SYNTAX_THEMES:
theme = ANSISyntaxTheme(RICH_SYNTAX_THEMES[name])
else:
theme = PygmentsSyntaxTheme(name)
return theme
def __init__(
self,
code: str,
lexer: Union[Lexer, str],
*,
theme: Union[str, SyntaxTheme] = DEFAULT_THEME,
dedent: bool = False,
line_numbers: bool = False,
start_line: int = 1,
line_range: Optional[Tuple[int, int]] = None,
highlight_lines: Optional[Set[int]] = None,
code_width: Optional[int] = None,
tab_size: int = 4,
word_wrap: bool = False,
background_color: Optional[str] = None,
indent_guides: bool = False,
) -> None:
self.code = code
self._lexer = lexer
self.dedent = dedent
self.line_numbers = line_numbers
self.start_line = start_line
self.line_range = line_range
self.highlight_lines = highlight_lines or set()
self.code_width = code_width
self.tab_size = tab_size
self.word_wrap = word_wrap
self.background_color = background_color
self.background_style = (
Style(bgcolor=background_color) if background_color else Style()
)
self.indent_guides = indent_guides
self._theme = self.get_theme(theme)
@classmethod
def from_path(
cls,
path: str,
encoding: str = "utf-8",
theme: Union[str, SyntaxTheme] = DEFAULT_THEME,
dedent: bool = False,
line_numbers: bool = False,
line_range: Optional[Tuple[int, int]] = None,
start_line: int = 1,
highlight_lines: Optional[Set[int]] = None,
code_width: Optional[int] = None,
tab_size: int = 4,
word_wrap: bool = False,
background_color: Optional[str] = None,
indent_guides: bool = False,
) -> "Syntax":
"""Construct a Syntax object from a file.
Args:
path (str): Path to file to highlight.
encoding (str): Encoding of file.
theme (str, optional): Color theme, aka Pygments style (see https://pygments.org/docs/styles/#getting-a-list-of-available-styles). Defaults to "emacs".
dedent (bool, optional): Enable stripping of initial whitespace. Defaults to True.
line_numbers (bool, optional): Enable rendering of line numbers. Defaults to False.
start_line (int, optional): Starting number for line numbers. Defaults to 1.
line_range (Tuple[int, int], optional): If given should be a tuple of the start and end line to render.
highlight_lines (Set[int]): A set of line numbers to highlight.
code_width: Width of code to render (not including line numbers), or ``None`` to use all available width.
tab_size (int, optional): Size of tabs. Defaults to 4.
word_wrap (bool, optional): Enable word wrapping of code.
background_color (str, optional): Optional background color, or None to use theme color. Defaults to None.
indent_guides (bool, optional): Show indent guides. Defaults to False.
Returns:
[Syntax]: A Syntax object that may be printed to the console
"""
with open(path, "rt", encoding=encoding) as code_file:
code = code_file.read()
lexer = None
lexer_name = "default"
try:
_, ext = os.path.splitext(path)
if ext:
extension = ext.lstrip(".").lower()
lexer = get_lexer_by_name(extension)
lexer_name = lexer.name
except ClassNotFound:
pass
if lexer is None:
try:
lexer_name = guess_lexer_for_filename(path, code).name
except ClassNotFound:
pass
return cls(
code,
lexer_name,
theme=theme,
dedent=dedent,
line_numbers=line_numbers,
line_range=line_range,
start_line=start_line,
highlight_lines=highlight_lines,
code_width=code_width,
tab_size=tab_size,
word_wrap=word_wrap,
background_color=background_color,
indent_guides=indent_guides,
)
def _get_base_style(self) -> Style:
"""Get the base style."""
default_style = self._theme.get_background_style() + self.background_style
return default_style
def _get_token_color(self, token_type: TokenType) -> Optional[Color]:
"""Get a color (if any) for the given token.
Args:
token_type (TokenType): A token type tuple from Pygments.
Returns:
Optional[Color]: Color from theme, or None for no color.
"""
style = self._theme.get_style_for_token(token_type)
return style.color
@property
def lexer(self) -> Optional[Lexer]:
"""The lexer for this syntax, or None if no lexer was found.
Tries to find the lexer by name if a string was passed to the constructor.
"""
if isinstance(self._lexer, Lexer):
return self._lexer
try:
return get_lexer_by_name(
self._lexer,
stripnl=False,
ensurenl=True,
tabsize=self.tab_size,
)
except ClassNotFound:
return None
def highlight(
self, code: str, line_range: Optional[Tuple[int, int]] = None
) -> Text:
"""Highlight code and return a Text instance.
Args:
code (str): Code to highlight.
line_range(Tuple[int, int], optional): Optional line range to highlight.
Returns:
Text: A text instance containing highlighted syntax.
"""
base_style = self._get_base_style()
justify: JustifyMethod = (
"default" if base_style.transparent_background else "left"
)
text = Text(
justify=justify,
style=base_style,
tab_size=self.tab_size,
no_wrap=not self.word_wrap,
)
_get_theme_style = self._theme.get_style_for_token
lexer = self.lexer
if lexer is None:
text.append(code)
else:
if line_range:
# More complicated path to only stylize a portion of the code
# This speeds up further operations as there are less spans to process
line_start, line_end = line_range
def line_tokenize() -> Iterable[Tuple[Any, str]]:
"""Split tokens to one per line."""
assert lexer
for token_type, token in lexer.get_tokens(code):
while token:
line_token, new_line, token = token.partition("\n")
yield token_type, line_token + new_line
def tokens_to_spans() -> Iterable[Tuple[str, Optional[Style]]]:
"""Convert tokens to spans."""
tokens = iter(line_tokenize())
line_no = 0
_line_start = line_start - 1
# Skip over tokens until line start
while line_no < _line_start:
_token_type, token = next(tokens)
yield (token, None)
if token.endswith("\n"):
line_no += 1
# Generate spans until line end
for token_type, token in tokens:
yield (token, _get_theme_style(token_type))
if token.endswith("\n"):
line_no += 1
if line_no >= line_end:
break
text.append_tokens(tokens_to_spans())
else:
text.append_tokens(
(token, _get_theme_style(token_type))
for token_type, token in lexer.get_tokens(code)
)
if self.background_color is not None:
text.stylize(f"on {self.background_color}")
return text
def _get_line_numbers_color(self, blend: float = 0.3) -> Color:
background_style = self._theme.get_background_style() + self.background_style
background_color = background_style.bgcolor
if background_color is None or background_color.is_system_defined:
return Color.default()
foreground_color = self._get_token_color(Token.Text)
if foreground_color is None or foreground_color.is_system_defined:
return foreground_color or Color.default()
new_color = blend_rgb(
background_color.get_truecolor(),
foreground_color.get_truecolor(),
cross_fade=blend,
)
return Color.from_triplet(new_color)
@property
def _numbers_column_width(self) -> int:
"""Get the number of characters used to render the numbers column."""
column_width = 0
if self.line_numbers:
column_width = len(str(self.start_line + self.code.count("\n"))) + 2
return column_width
def _get_number_styles(self, console: Console) -> Tuple[Style, Style, Style]:
"""Get background, number, and highlight styles for line numbers."""
background_style = self._get_base_style()
if background_style.transparent_background:
return Style.null(), Style(dim=True), Style.null()
if console.color_system in ("256", "truecolor"):
number_style = Style.chain(
background_style,
self._theme.get_style_for_token(Token.Text),
Style(color=self._get_line_numbers_color()),
self.background_style,
)
highlight_number_style = Style.chain(
background_style,
self._theme.get_style_for_token(Token.Text),
Style(bold=True, color=self._get_line_numbers_color(0.9)),
self.background_style,
)
else:
number_style = background_style + Style(dim=True)
highlight_number_style = background_style + Style(dim=False)
return background_style, number_style, highlight_number_style
def __rich_measure__(
self, console: "Console", options: "ConsoleOptions"
) -> "Measurement":
if self.code_width is not None:
width = self.code_width + self._numbers_column_width
return Measurement(self._numbers_column_width, width)
return Measurement(self._numbers_column_width, options.max_width)
def __rich_console__(
self, console: Console, options: ConsoleOptions
) -> RenderResult:
transparent_background = self._get_base_style().transparent_background
code_width = (
(
(options.max_width - self._numbers_column_width - 1)
if self.line_numbers
else options.max_width
)
if self.code_width is None
else self.code_width
)
line_offset = 0
if self.line_range:
start_line, end_line = self.line_range
line_offset = max(0, start_line - 1)
ends_on_nl = self.code.endswith("\n")
code = self.code if ends_on_nl else self.code + "\n"
code = textwrap.dedent(code) if self.dedent else code
code = code.expandtabs(self.tab_size)
text = self.highlight(code, self.line_range)
(
background_style,
number_style,
highlight_number_style,
) = self._get_number_styles(console)
if not self.line_numbers and not self.word_wrap and not self.line_range:
if not ends_on_nl:
text.remove_suffix("\n")
# Simple case of just rendering text
style = (
self._get_base_style()
+ self._theme.get_style_for_token(Comment)
+ Style(dim=True)
+ self.background_style
)
if self.indent_guides and not options.ascii_only:
text = text.with_indent_guides(self.tab_size, style=style)
text.overflow = "crop"
if style.transparent_background:
yield from console.render(
text, options=options.update(width=code_width)
)
else:
syntax_lines = console.render_lines(
text,
options.update(width=code_width, height=None),
style=self.background_style,
pad=True,
new_lines=True,
)
for syntax_line in syntax_lines:
yield from syntax_line
return
lines: Union[List[Text], Lines] = text.split("\n", allow_blank=ends_on_nl)
if self.line_range:
lines = lines[line_offset:end_line]
if self.indent_guides and not options.ascii_only:
style = (
self._get_base_style()
+ self._theme.get_style_for_token(Comment)
+ Style(dim=True)
+ self.background_style
)
lines = (
Text("\n")
.join(lines)
.with_indent_guides(self.tab_size, style=style)
.split("\n", allow_blank=True)
)
numbers_column_width = self._numbers_column_width
render_options = options.update(width=code_width)
highlight_line = self.highlight_lines.__contains__
_Segment = Segment
padding = _Segment(" " * numbers_column_width + " ", background_style)
new_line = _Segment("\n")
line_pointer = "> " if options.legacy_windows else ""
for line_no, line in enumerate(lines, self.start_line + line_offset):
if self.word_wrap:
wrapped_lines = console.render_lines(
line,
render_options.update(height=None),
style=background_style,
pad=not transparent_background,
)
else:
segments = list(line.render(console, end=""))
if options.no_wrap:
wrapped_lines = [segments]
else:
wrapped_lines = [
_Segment.adjust_line_length(
segments,
render_options.max_width,
style=background_style,
pad=not transparent_background,
)
]
if self.line_numbers:
for first, wrapped_line in loop_first(wrapped_lines):
if first:
line_column = str(line_no).rjust(numbers_column_width - 2) + " "
if highlight_line(line_no):
yield _Segment(line_pointer, Style(color="red"))
yield _Segment(line_column, highlight_number_style)
else:
yield _Segment(" ", highlight_number_style)
yield _Segment(line_column, number_style)
else:
yield padding
yield from wrapped_line
yield new_line
else:
for wrapped_line in wrapped_lines:
yield from wrapped_line
yield new_line
if __name__ == "__main__": # pragma: no cover
import argparse
import sys
parser = argparse.ArgumentParser(
description="Render syntax to the console with Rich"
)
parser.add_argument(
"path",
metavar="PATH",
help="path to file, or - for stdin",
)
parser.add_argument(
"-c",
"--force-color",
dest="force_color",
action="store_true",
default=None,
help="force color for non-terminals",
)
parser.add_argument(
"-i",
"--indent-guides",
dest="indent_guides",
action="store_true",
default=False,
help="display indent guides",
)
parser.add_argument(
"-l",
"--line-numbers",
dest="line_numbers",
action="store_true",
help="render line numbers",
)
parser.add_argument(
"-w",
"--width",
type=int,
dest="width",
default=None,
help="width of output (default will auto-detect)",
)
parser.add_argument(
"-r",
"--wrap",
dest="word_wrap",
action="store_true",
default=False,
help="word wrap long lines",
)
parser.add_argument(
"-s",
"--soft-wrap",
action="store_true",
dest="soft_wrap",
default=False,
help="enable soft wrapping mode",
)
parser.add_argument(
"-t", "--theme", dest="theme", default="monokai", help="pygments theme"
)
parser.add_argument(
"-b",
"--background-color",
dest="background_color",
default=None,
help="Override background color",
)
parser.add_argument(
"-x",
"--lexer",
default="default",
dest="lexer_name",
help="Lexer name",
)
args = parser.parse_args()
from rich.console import Console
console = Console(force_terminal=args.force_color, width=args.width)
if args.path == "-":
code = sys.stdin.read()
syntax = Syntax(
code=code,
lexer=args.lexer_name,
line_numbers=args.line_numbers,
word_wrap=args.word_wrap,
theme=args.theme,
background_color=args.background_color,
indent_guides=args.indent_guides,
)
else:
syntax = Syntax.from_path(
args.path,
line_numbers=args.line_numbers,
word_wrap=args.word_wrap,
theme=args.theme,
background_color=args.background_color,
indent_guides=args.indent_guides,
)
console.print(syntax, soft_wrap=args.soft_wrap)