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
|
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()
|
