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
|
import xml.dom.minidom as minidom
from typing import Any, List, Tuple, Union
from .base import FormattedText, StyleAndTextTuples
__all__ = ["HTML"]
class HTML:
"""
HTML formatted text.
Take something HTML-like, for use as a formatted string.
::
# Turn something into red.
HTML('<style fg="ansired" bg="#00ff44">...</style>')
# Italic, bold, underline and strike.
HTML('<i>...</i>')
HTML('<b>...</b>')
HTML('<u>...</u>')
HTML('<s>...</s>')
All HTML elements become available as a "class" in the style sheet.
E.g. ``<username>...</username>`` can be styled, by setting a style for
``username``.
"""
def __init__(self, value: str) -> None:
self.value = value
document = minidom.parseString("<html-root>%s</html-root>" % (value,))
result: StyleAndTextTuples = []
name_stack: List[str] = []
fg_stack: List[str] = []
bg_stack: List[str] = []
def get_current_style() -> str:
"Build style string for current node."
parts = []
if name_stack:
parts.append("class:" + ",".join(name_stack))
if fg_stack:
parts.append("fg:" + fg_stack[-1])
if bg_stack:
parts.append("bg:" + bg_stack[-1])
return " ".join(parts)
def process_node(node: Any) -> None:
"Process node recursively."
for child in node.childNodes:
if child.nodeType == child.TEXT_NODE:
result.append((get_current_style(), child.data))
else:
add_to_name_stack = child.nodeName not in (
"#document",
"html-root",
"style",
)
fg = bg = ""
for k, v in child.attributes.items():
if k == "fg":
fg = v
if k == "bg":
bg = v
if k == "color":
fg = v # Alias for 'fg'.
# Check for spaces in attributes. This would result in
# invalid style strings otherwise.
if " " in fg:
raise ValueError('"fg" attribute contains a space.')
if " " in bg:
raise ValueError('"bg" attribute contains a space.')
if add_to_name_stack:
name_stack.append(child.nodeName)
if fg:
fg_stack.append(fg)
if bg:
bg_stack.append(bg)
process_node(child)
if add_to_name_stack:
name_stack.pop()
if fg:
fg_stack.pop()
if bg:
bg_stack.pop()
process_node(document)
self.formatted_text = FormattedText(result)
def __repr__(self) -> str:
return "HTML(%r)" % (self.value,)
def __pt_formatted_text__(self) -> StyleAndTextTuples:
return self.formatted_text
def format(self, *args: object, **kwargs: object) -> "HTML":
"""
Like `str.format`, but make sure that the arguments are properly
escaped.
"""
# Escape all the arguments.
escaped_args = [html_escape(a) for a in args]
escaped_kwargs = {k: html_escape(v) for k, v in kwargs.items()}
return HTML(self.value.format(*escaped_args, **escaped_kwargs))
def __mod__(self, value: Union[object, Tuple[object, ...]]) -> "HTML":
"""
HTML('<b>%s</b>') % value
"""
if not isinstance(value, tuple):
value = (value,)
value = tuple(html_escape(i) for i in value)
return HTML(self.value % value)
def html_escape(text: object) -> str:
# The string interpolation functions also take integers and other types.
# Convert to string first.
if not isinstance(text, str):
text = "{}".format(text)
return (
text.replace("&", "&")
.replace("<", "<")
.replace(">", ">")
.replace('"', """)
)
|
