161 lines
4.7 KiB
Python
161 lines
4.7 KiB
Python
|
from __future__ import annotations
|
||
|
|
|
||
|
|
import os
|
||
|
|
from typing import Tuple
|
||
|
|
|
||
|
|
from pygments.lexer import Lexer
|
||
|
|
from pygments.lexers import get_lexer_by_name, guess_lexer_for_filename
|
||
|
|
from pygments.token import Token
|
||
|
|
from pygments.util import ClassNotFound
|
||
|
|
|
||
|
|
from textual.content import Content, Span
|
||
|
|
|
||
|
|
TokenType = Tuple[str, ...]
|
||
|
|
|
||
|
|
|
||
|
|
class HighlightTheme:
|
||
|
|
"""Contains the style definition for user with the highlight method."""
|
||
|
|
|
||
|
|
STYLES: dict[TokenType, str] = {
|
||
|
|
Token.Comment: "$text 60%",
|
||
|
|
Token.Error: "$text-error on $error-muted",
|
||
|
|
Token.Generic.Strong: "bold",
|
||
|
|
Token.Generic.Emph: "italic",
|
||
|
|
Token.Generic.Error: "$text-error on $error-muted",
|
||
|
|
Token.Generic.Heading: "$text-primary underline",
|
||
|
|
Token.Generic.Subheading: "$text-primary",
|
||
|
|
Token.Keyword: "$text-accent",
|
||
|
|
Token.Keyword.Constant: "bold $text-success 80%",
|
||
|
|
Token.Keyword.Namespace: "$text-error",
|
||
|
|
Token.Keyword.Type: "bold",
|
||
|
|
Token.Literal.Number: "$text-warning",
|
||
|
|
Token.Literal.String.Backtick: "$text 60%",
|
||
|
|
Token.Literal.String: "$text-success 90%",
|
||
|
|
Token.Literal.String.Doc: "$text-success 80% italic",
|
||
|
|
Token.Literal.String.Double: "$text-success 90%",
|
||
|
|
Token.Name: "$text-primary",
|
||
|
|
Token.Name.Attribute: "$text-warning",
|
||
|
|
Token.Name.Builtin: "$text-accent",
|
||
|
|
Token.Name.Builtin.Pseudo: "italic",
|
||
|
|
Token.Name.Class: "$text-warning bold",
|
||
|
|
Token.Name.Constant: "$text-error",
|
||
|
|
Token.Name.Decorator: "$text-primary bold",
|
||
|
|
Token.Name.Function: "$text-warning underline",
|
||
|
|
Token.Name.Function.Magic: "$text-warning underline",
|
||
|
|
Token.Name.Tag: "$text-primary bold",
|
||
|
|
Token.Name.Variable: "$text-secondary",
|
||
|
|
Token.Number: "$text-warning",
|
||
|
|
Token.Operator: "bold",
|
||
|
|
Token.Operator.Word: "bold $text-error",
|
||
|
|
Token.String: "$text-success",
|
||
|
|
Token.Whitespace: "",
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def guess_language(code: str, path: str | None) -> str:
|
||
|
|
"""Guess the language based on the code and path.
|
||
|
|
The result may be used in the [highlight][textual.highlight.highlight] function.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
code: The code to guess from.
|
||
|
|
path: A path to the code.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
The language, suitable for use with Pygments.
|
||
|
|
"""
|
||
|
|
|
||
|
|
if path and os.path.splitext(path)[-1] == ".tcss":
|
||
|
|
# A special case for TCSS files which aren't known outside of Textual
|
||
|
|
return "scss"
|
||
|
|
|
||
|
|
lexer: Lexer | None = None
|
||
|
|
lexer_name = "default"
|
||
|
|
if code:
|
||
|
|
if path:
|
||
|
|
try:
|
||
|
|
lexer = guess_lexer_for_filename(path, code)
|
||
|
|
except ClassNotFound:
|
||
|
|
pass
|
||
|
|
|
||
|
|
if lexer is None:
|
||
|
|
from pygments.lexers import guess_lexer
|
||
|
|
|
||
|
|
try:
|
||
|
|
lexer = guess_lexer(code)
|
||
|
|
except Exception:
|
||
|
|
pass
|
||
|
|
|
||
|
|
if not lexer and path:
|
||
|
|
try:
|
||
|
|
_, ext = os.path.splitext(path)
|
||
|
|
if ext:
|
||
|
|
extension = ext.lstrip(".").lower()
|
||
|
|
lexer = get_lexer_by_name(extension)
|
||
|
|
except ClassNotFound:
|
||
|
|
pass
|
||
|
|
|
||
|
|
if lexer:
|
||
|
|
if lexer.aliases:
|
||
|
|
lexer_name = lexer.aliases[0]
|
||
|
|
else:
|
||
|
|
lexer_name = lexer.name
|
||
|
|
|
||
|
|
return lexer_name
|
||
|
|
|
||
|
|
|
||
|
|
def highlight(
|
||
|
|
code: str,
|
||
|
|
*,
|
||
|
|
language: str | None = None,
|
||
|
|
path: str | None = None,
|
||
|
|
theme: type[HighlightTheme] = HighlightTheme,
|
||
|
|
tab_size: int = 8,
|
||
|
|
) -> Content:
|
||
|
|
"""Apply syntax highlighting to a string.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
code: A string to highlight.
|
||
|
|
language: The language to highlight.
|
||
|
|
theme: A HighlightTheme class (type not instance).
|
||
|
|
tab_size: Number of spaces in a tab.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
A Content instance which may be used in a widget.
|
||
|
|
"""
|
||
|
|
if not language:
|
||
|
|
language = guess_language(code, path)
|
||
|
|
|
||
|
|
assert language is not None
|
||
|
|
code = "\n".join(code.splitlines())
|
||
|
|
try:
|
||
|
|
lexer = get_lexer_by_name(
|
||
|
|
language,
|
||
|
|
stripnl=False,
|
||
|
|
ensurenl=True,
|
||
|
|
tabsize=tab_size,
|
||
|
|
)
|
||
|
|
except ClassNotFound:
|
||
|
|
lexer = get_lexer_by_name(
|
||
|
|
"text",
|
||
|
|
stripnl=False,
|
||
|
|
ensurenl=True,
|
||
|
|
tabsize=tab_size,
|
||
|
|
)
|
||
|
|
|
||
|
|
token_start = 0
|
||
|
|
spans: list[Span] = []
|
||
|
|
styles = theme.STYLES
|
||
|
|
|
||
|
|
for token_type, token in lexer.get_tokens(code):
|
||
|
|
token_end = token_start + len(token)
|
||
|
|
while True:
|
||
|
|
if style := styles.get(token_type):
|
||
|
|
spans.append(Span(token_start, token_end, style))
|
||
|
|
break
|
||
|
|
if (token_type := token_type.parent) is None:
|
||
|
|
break
|
||
|
|
token_start = token_end
|
||
|
|
|
||
|
|
highlighted_code = Content(code, spans=spans).stylize_before("$text")
|
||
|
|
return highlighted_code
|