File size: 9,679 Bytes
c7e8396 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 |
from __future__ import annotations
from string import Formatter
from typing import Generator
from prompt_toolkit.output.vt100 import BG_ANSI_COLORS, FG_ANSI_COLORS
from prompt_toolkit.output.vt100 import _256_colors as _256_colors_table
from .base import StyleAndTextTuples
__all__ = [
"ANSI",
"ansi_escape",
]
class ANSI:
"""
ANSI formatted text.
Take something ANSI escaped text, for use as a formatted string. E.g.
::
ANSI('\\x1b[31mhello \\x1b[32mworld')
Characters between ``\\001`` and ``\\002`` are supposed to have a zero width
when printed, but these are literally sent to the terminal output. This can
be used for instance, for inserting Final Term prompt commands. They will
be translated into a prompt_toolkit '[ZeroWidthEscape]' fragment.
"""
def __init__(self, value: str) -> None:
self.value = value
self._formatted_text: StyleAndTextTuples = []
# Default style attributes.
self._color: str | None = None
self._bgcolor: str | None = None
self._bold = False
self._underline = False
self._strike = False
self._italic = False
self._blink = False
self._reverse = False
self._hidden = False
# Process received text.
parser = self._parse_corot()
parser.send(None) # type: ignore
for c in value:
parser.send(c)
def _parse_corot(self) -> Generator[None, str, None]:
"""
Coroutine that parses the ANSI escape sequences.
"""
style = ""
formatted_text = self._formatted_text
while True:
# NOTE: CSI is a special token within a stream of characters that
# introduces an ANSI control sequence used to set the
# style attributes of the following characters.
csi = False
c = yield
# Everything between \001 and \002 should become a ZeroWidthEscape.
if c == "\001":
escaped_text = ""
while c != "\002":
c = yield
if c == "\002":
formatted_text.append(("[ZeroWidthEscape]", escaped_text))
c = yield
break
else:
escaped_text += c
# Check for CSI
if c == "\x1b":
# Start of color escape sequence.
square_bracket = yield
if square_bracket == "[":
csi = True
else:
continue
elif c == "\x9b":
csi = True
if csi:
# Got a CSI sequence. Color codes are following.
current = ""
params = []
while True:
char = yield
# Construct number
if char.isdigit():
current += char
# Eval number
else:
# Limit and save number value
params.append(min(int(current or 0), 9999))
# Get delimiter token if present
if char == ";":
current = ""
# Check and evaluate color codes
elif char == "m":
# Set attributes and token.
self._select_graphic_rendition(params)
style = self._create_style_string()
break
# Check and evaluate cursor forward
elif char == "C":
for i in range(params[0]):
# add <SPACE> using current style
formatted_text.append((style, " "))
break
else:
# Ignore unsupported sequence.
break
else:
# Add current character.
# NOTE: At this point, we could merge the current character
# into the previous tuple if the style did not change,
# however, it's not worth the effort given that it will
# be "Exploded" once again when it's rendered to the
# output.
formatted_text.append((style, c))
def _select_graphic_rendition(self, attrs: list[int]) -> None:
"""
Taken a list of graphics attributes and apply changes.
"""
if not attrs:
attrs = [0]
else:
attrs = list(attrs[::-1])
while attrs:
attr = attrs.pop()
if attr in _fg_colors:
self._color = _fg_colors[attr]
elif attr in _bg_colors:
self._bgcolor = _bg_colors[attr]
elif attr == 1:
self._bold = True
# elif attr == 2:
# self._faint = True
elif attr == 3:
self._italic = True
elif attr == 4:
self._underline = True
elif attr == 5:
self._blink = True # Slow blink
elif attr == 6:
self._blink = True # Fast blink
elif attr == 7:
self._reverse = True
elif attr == 8:
self._hidden = True
elif attr == 9:
self._strike = True
elif attr == 22:
self._bold = False # Normal intensity
elif attr == 23:
self._italic = False
elif attr == 24:
self._underline = False
elif attr == 25:
self._blink = False
elif attr == 27:
self._reverse = False
elif attr == 28:
self._hidden = False
elif attr == 29:
self._strike = False
elif not attr:
# Reset all style attributes
self._color = None
self._bgcolor = None
self._bold = False
self._underline = False
self._strike = False
self._italic = False
self._blink = False
self._reverse = False
self._hidden = False
elif attr in (38, 48) and len(attrs) > 1:
n = attrs.pop()
# 256 colors.
if n == 5 and len(attrs) >= 1:
if attr == 38:
m = attrs.pop()
self._color = _256_colors.get(m)
elif attr == 48:
m = attrs.pop()
self._bgcolor = _256_colors.get(m)
# True colors.
if n == 2 and len(attrs) >= 3:
try:
color_str = (
f"#{attrs.pop():02x}{attrs.pop():02x}{attrs.pop():02x}"
)
except IndexError:
pass
else:
if attr == 38:
self._color = color_str
elif attr == 48:
self._bgcolor = color_str
def _create_style_string(self) -> str:
"""
Turn current style flags into a string for usage in a formatted text.
"""
result = []
if self._color:
result.append(self._color)
if self._bgcolor:
result.append("bg:" + self._bgcolor)
if self._bold:
result.append("bold")
if self._underline:
result.append("underline")
if self._strike:
result.append("strike")
if self._italic:
result.append("italic")
if self._blink:
result.append("blink")
if self._reverse:
result.append("reverse")
if self._hidden:
result.append("hidden")
return " ".join(result)
def __repr__(self) -> str:
return f"ANSI({self.value!r})"
def __pt_formatted_text__(self) -> StyleAndTextTuples:
return self._formatted_text
def format(self, *args: str, **kwargs: str) -> ANSI:
"""
Like `str.format`, but make sure that the arguments are properly
escaped. (No ANSI escapes can be injected.)
"""
return ANSI(FORMATTER.vformat(self.value, args, kwargs))
def __mod__(self, value: object) -> ANSI:
"""
ANSI('<b>%s</b>') % value
"""
if not isinstance(value, tuple):
value = (value,)
value = tuple(ansi_escape(i) for i in value)
return ANSI(self.value % value)
# Mapping of the ANSI color codes to their names.
_fg_colors = {v: k for k, v in FG_ANSI_COLORS.items()}
_bg_colors = {v: k for k, v in BG_ANSI_COLORS.items()}
# Mapping of the escape codes for 256colors to their 'ffffff' value.
_256_colors = {}
for i, (r, g, b) in enumerate(_256_colors_table.colors):
_256_colors[i] = f"#{r:02x}{g:02x}{b:02x}"
def ansi_escape(text: object) -> str:
"""
Replace characters with a special meaning.
"""
return str(text).replace("\x1b", "?").replace("\b", "?")
class ANSIFormatter(Formatter):
def format_field(self, value: object, format_spec: str) -> str:
return ansi_escape(format(value, format_spec))
FORMATTER = ANSIFormatter()
|