Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/coloredlogs/converter/__init__.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # Program to convert text with ANSI escape sequences to HTML. |
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2 # |
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3 # Author: Peter Odding <peter@peterodding.com> |
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4 # Last Change: February 14, 2020 |
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5 # URL: https://coloredlogs.readthedocs.io |
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6 |
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7 """Convert text with ANSI escape sequences to HTML.""" |
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8 |
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9 # Standard library modules. |
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10 import codecs |
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11 import os |
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12 import pipes |
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13 import re |
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14 import subprocess |
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15 import tempfile |
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16 |
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17 # External dependencies. |
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18 from humanfriendly.terminal import ( |
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19 ANSI_CSI, |
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20 ANSI_TEXT_STYLES, |
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21 clean_terminal_output, |
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22 output, |
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23 ) |
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24 |
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25 # Modules included in our package. |
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26 from coloredlogs.converter.colors import ( |
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27 BRIGHT_COLOR_PALETTE, |
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28 EIGHT_COLOR_PALETTE, |
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29 EXTENDED_COLOR_PALETTE, |
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30 ) |
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31 |
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32 # Compiled regular expression that matches leading spaces (indentation). |
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33 INDENT_PATTERN = re.compile('^ +', re.MULTILINE) |
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34 |
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35 # Compiled regular expression that matches a tag followed by a space at the start of a line. |
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36 TAG_INDENT_PATTERN = re.compile('^(<[^>]+>) ', re.MULTILINE) |
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37 |
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38 # Compiled regular expression that matches strings we want to convert. Used to |
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39 # separate all special strings and literal output in a single pass (this allows |
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40 # us to properly encode the output without resorting to nasty hacks). |
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41 TOKEN_PATTERN = re.compile(r''' |
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42 # Wrap the pattern in a capture group so that re.split() includes the |
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43 # substrings that match the pattern in the resulting list of strings. |
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44 ( |
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45 # Match URLs with supported schemes and domain names. |
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46 (?: https?:// | www\\. ) |
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47 # Scan until the end of the URL by matching non-whitespace characters |
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48 # that are also not escape characters. |
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49 [^\s\x1b]+ |
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50 # Alternatively ... |
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51 | |
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52 # Match (what looks like) ANSI escape sequences. |
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53 \x1b \[ .*? m |
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54 ) |
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55 ''', re.UNICODE | re.VERBOSE) |
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56 |
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57 |
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58 def capture(command, encoding='UTF-8'): |
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59 """ |
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60 Capture the output of an external command as if it runs in an interactive terminal. |
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61 |
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62 :param command: The command name and its arguments (a list of strings). |
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63 :param encoding: The encoding to use to decode the output (a string). |
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64 :returns: The output of the command. |
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65 |
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66 This function runs an external command under ``script`` (emulating an |
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67 interactive terminal) to capture the output of the command as if it was |
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68 running in an interactive terminal (including ANSI escape sequences). |
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69 """ |
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70 with open(os.devnull, 'wb') as dev_null: |
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71 # We start by invoking the `script' program in a form that is supported |
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72 # by the Linux implementation [1] but fails command line validation on |
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73 # the MacOS (BSD) implementation [2]: The command is specified using |
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74 # the -c option and the typescript file is /dev/null. |
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75 # |
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76 # [1] http://man7.org/linux/man-pages/man1/script.1.html |
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77 # [2] https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man1/script.1.html |
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78 command_line = ['script', '-qc', ' '.join(map(pipes.quote, command)), '/dev/null'] |
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79 script = subprocess.Popen(command_line, stdout=subprocess.PIPE, stderr=dev_null) |
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80 stdout, stderr = script.communicate() |
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81 if script.returncode == 0: |
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82 # If `script' succeeded we assume that it understood our command line |
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83 # invocation which means it's the Linux implementation (in this case |
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84 # we can use standard output instead of a temporary file). |
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85 output = stdout.decode(encoding) |
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86 else: |
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87 # If `script' failed we assume that it didn't understand our command |
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88 # line invocation which means it's the MacOS (BSD) implementation |
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89 # (in this case we need a temporary file because the command line |
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90 # interface requires it). |
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91 fd, temporary_file = tempfile.mkstemp(prefix='coloredlogs-', suffix='-capture.txt') |
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92 try: |
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93 command_line = ['script', '-q', temporary_file] + list(command) |
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94 subprocess.Popen(command_line, stdout=dev_null, stderr=dev_null).wait() |
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95 with codecs.open(temporary_file, 'rb') as handle: |
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96 output = handle.read() |
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97 finally: |
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98 os.unlink(temporary_file) |
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99 # On MacOS when standard input is /dev/null I've observed |
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100 # the captured output starting with the characters '^D': |
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101 # |
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102 # $ script -q capture.txt echo example </dev/null |
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103 # example |
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104 # $ xxd capture.txt |
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105 # 00000000: 5e44 0808 6578 616d 706c 650d 0a ^D..example.. |
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106 # |
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107 # I'm not sure why this is here, although I suppose it has to do |
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108 # with ^D in caret notation signifying end-of-file [1]. What I do |
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109 # know is that this is an implementation detail that callers of the |
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110 # capture() function shouldn't be bothered with, so we strip it. |
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111 # |
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112 # [1] https://en.wikipedia.org/wiki/End-of-file |
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113 if output.startswith(b'^D'): |
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114 output = output[2:] |
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115 output = output.decode(encoding) |
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116 # Clean up backspace and carriage return characters and the 'erase line' |
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117 # ANSI escape sequence and return the output as a Unicode string. |
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118 return u'\n'.join(clean_terminal_output(output)) |
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119 |
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120 |
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121 def convert(text, code=True, tabsize=4): |
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122 """ |
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123 Convert text with ANSI escape sequences to HTML. |
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124 |
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125 :param text: The text with ANSI escape sequences (a string). |
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126 :param code: Whether to wrap the returned HTML fragment in a |
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127 ``<code>...</code>`` element (a boolean, defaults |
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128 to :data:`True`). |
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129 :param tabsize: Refer to :func:`str.expandtabs()` for details. |
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130 :returns: The text converted to HTML (a string). |
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131 """ |
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132 output = [] |
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133 in_span = False |
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134 compatible_text_styles = { |
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135 # The following ANSI text styles have an obvious mapping to CSS. |
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136 ANSI_TEXT_STYLES['bold']: {'font-weight': 'bold'}, |
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137 ANSI_TEXT_STYLES['strike_through']: {'text-decoration': 'line-through'}, |
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138 ANSI_TEXT_STYLES['underline']: {'text-decoration': 'underline'}, |
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139 } |
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140 for token in TOKEN_PATTERN.split(text): |
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141 if token.startswith(('http://', 'https://', 'www.')): |
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142 url = token if '://' in token else ('http://' + token) |
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143 token = u'<a href="%s" style="color:inherit">%s</a>' % (html_encode(url), html_encode(token)) |
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144 elif token.startswith(ANSI_CSI): |
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145 ansi_codes = token[len(ANSI_CSI):-1].split(';') |
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146 if all(c.isdigit() for c in ansi_codes): |
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147 ansi_codes = list(map(int, ansi_codes)) |
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148 # First we check for a reset code to close the previous <span> |
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149 # element. As explained on Wikipedia [1] an absence of codes |
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150 # implies a reset code as well: "No parameters at all in ESC[m acts |
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151 # like a 0 reset code". |
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152 # [1] https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_sequences |
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153 if in_span and (0 in ansi_codes or not ansi_codes): |
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154 output.append('</span>') |
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155 in_span = False |
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156 # Now we're ready to generate the next <span> element (if any) in |
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157 # the knowledge that we're emitting opening <span> and closing |
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158 # </span> tags in the correct order. |
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159 styles = {} |
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160 is_faint = (ANSI_TEXT_STYLES['faint'] in ansi_codes) |
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161 is_inverse = (ANSI_TEXT_STYLES['inverse'] in ansi_codes) |
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162 while ansi_codes: |
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163 number = ansi_codes.pop(0) |
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164 # Try to match a compatible text style. |
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165 if number in compatible_text_styles: |
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166 styles.update(compatible_text_styles[number]) |
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167 continue |
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168 # Try to extract a text and/or background color. |
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169 text_color = None |
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170 background_color = None |
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171 if 30 <= number <= 37: |
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172 # 30-37 sets the text color from the eight color palette. |
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173 text_color = EIGHT_COLOR_PALETTE[number - 30] |
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174 elif 40 <= number <= 47: |
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175 # 40-47 sets the background color from the eight color palette. |
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176 background_color = EIGHT_COLOR_PALETTE[number - 40] |
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177 elif 90 <= number <= 97: |
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178 # 90-97 sets the text color from the high-intensity eight color palette. |
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179 text_color = BRIGHT_COLOR_PALETTE[number - 90] |
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180 elif 100 <= number <= 107: |
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181 # 100-107 sets the background color from the high-intensity eight color palette. |
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182 background_color = BRIGHT_COLOR_PALETTE[number - 100] |
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183 elif number in (38, 39) and len(ansi_codes) >= 2 and ansi_codes[0] == 5: |
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184 # 38;5;N is a text color in the 256 color mode palette, |
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185 # 39;5;N is a background color in the 256 color mode palette. |
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186 try: |
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187 # Consume the 5 following 38 or 39. |
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188 ansi_codes.pop(0) |
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189 # Consume the 256 color mode color index. |
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190 color_index = ansi_codes.pop(0) |
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191 # Set the variable to the corresponding HTML/CSS color. |
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192 if number == 38: |
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193 text_color = EXTENDED_COLOR_PALETTE[color_index] |
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194 elif number == 39: |
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195 background_color = EXTENDED_COLOR_PALETTE[color_index] |
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196 except (ValueError, IndexError): |
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197 pass |
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198 # Apply the 'faint' or 'inverse' text style |
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199 # by manipulating the selected color(s). |
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200 if text_color and is_inverse: |
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201 # Use the text color as the background color and pick a |
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202 # text color that will be visible on the resulting |
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203 # background color. |
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204 background_color = text_color |
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205 text_color = select_text_color(*parse_hex_color(text_color)) |
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206 if text_color and is_faint: |
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207 # Because I wasn't sure how to implement faint colors |
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208 # based on normal colors I looked at how gnome-terminal |
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209 # (my terminal of choice) handles this and it appears |
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210 # to just pick a somewhat darker color. |
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211 text_color = '#%02X%02X%02X' % tuple( |
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212 max(0, n - 40) for n in parse_hex_color(text_color) |
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213 ) |
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214 if text_color: |
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215 styles['color'] = text_color |
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216 if background_color: |
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217 styles['background-color'] = background_color |
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218 if styles: |
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219 token = '<span style="%s">' % ';'.join(k + ':' + v for k, v in sorted(styles.items())) |
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220 in_span = True |
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221 else: |
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222 token = '' |
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223 else: |
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224 token = html_encode(token) |
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225 output.append(token) |
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226 html = ''.join(output) |
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227 html = encode_whitespace(html, tabsize) |
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228 if code: |
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229 html = '<code>%s</code>' % html |
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230 return html |
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231 |
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232 |
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233 def encode_whitespace(text, tabsize=4): |
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234 """ |
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235 Encode whitespace so that web browsers properly render it. |
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236 |
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237 :param text: The plain text (a string). |
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238 :param tabsize: Refer to :func:`str.expandtabs()` for details. |
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239 :returns: The text converted to HTML (a string). |
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240 |
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241 The purpose of this function is to encode whitespace in such a way that web |
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242 browsers render the same whitespace regardless of whether 'preformatted' |
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243 styling is used (by wrapping the text in a ``<pre>...</pre>`` element). |
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244 |
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245 .. note:: While the string manipulation performed by this function is |
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246 specifically intended not to corrupt the HTML generated by |
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247 :func:`convert()` it definitely does have the potential to |
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248 corrupt HTML from other sources. You have been warned :-). |
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249 """ |
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250 # Convert Windows line endings (CR+LF) to UNIX line endings (LF). |
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251 text = text.replace('\r\n', '\n') |
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252 # Convert UNIX line endings (LF) to HTML line endings (<br>). |
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253 text = text.replace('\n', '<br>\n') |
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254 # Convert tabs to spaces. |
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255 text = text.expandtabs(tabsize) |
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256 # Convert leading spaces (that is to say spaces at the start of the string |
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257 # and/or directly after a line ending) into non-breaking spaces, otherwise |
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258 # HTML rendering engines will simply ignore these spaces. |
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259 text = re.sub(INDENT_PATTERN, encode_whitespace_cb, text) |
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260 # The conversion of leading spaces we just did misses a corner case where a |
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261 # line starts with an HTML tag but the first visible text is a space. Web |
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262 # browsers seem to ignore these spaces, so we need to convert them. |
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263 text = re.sub(TAG_INDENT_PATTERN, r'\1 ', text) |
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264 # Convert runs of multiple spaces into non-breaking spaces to avoid HTML |
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265 # rendering engines from visually collapsing runs of spaces into a single |
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266 # space. We specifically don't replace single spaces for several reasons: |
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267 # 1. We'd break the HTML emitted by convert() by replacing spaces |
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268 # inside HTML elements (for example the spaces that separate |
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269 # element names from attribute names). |
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270 # 2. If every single space is replaced by a non-breaking space, |
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271 # web browsers perform awkwardly unintuitive word wrapping. |
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272 # 3. The HTML output would be bloated for no good reason. |
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273 text = re.sub(' {2,}', encode_whitespace_cb, text) |
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274 return text |
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275 |
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276 |
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277 def encode_whitespace_cb(match): |
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278 """ |
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279 Replace runs of multiple spaces with non-breaking spaces. |
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280 |
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281 :param match: A regular expression match object. |
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282 :returns: The replacement string. |
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283 |
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284 This function is used by func:`encode_whitespace()` as a callback for |
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285 replacement using a regular expression pattern. |
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286 """ |
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287 return ' ' * len(match.group(0)) |
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288 |
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289 |
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290 def html_encode(text): |
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291 """ |
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292 Encode characters with a special meaning as HTML. |
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293 |
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294 :param text: The plain text (a string). |
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295 :returns: The text converted to HTML (a string). |
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296 """ |
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297 text = text.replace('&', '&') |
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298 text = text.replace('<', '<') |
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299 text = text.replace('>', '>') |
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300 text = text.replace('"', '"') |
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301 return text |
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302 |
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303 |
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304 def parse_hex_color(value): |
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305 """ |
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306 Convert a CSS color in hexadecimal notation into its R, G, B components. |
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307 |
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308 :param value: A CSS color in hexadecimal notation (a string like '#000000'). |
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309 :return: A tuple with three integers (with values between 0 and 255) |
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310 corresponding to the R, G and B components of the color. |
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311 :raises: :exc:`~exceptions.ValueError` on values that can't be parsed. |
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312 """ |
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313 if value.startswith('#'): |
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314 value = value[1:] |
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315 if len(value) == 3: |
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316 return ( |
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317 int(value[0] * 2, 16), |
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318 int(value[1] * 2, 16), |
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319 int(value[2] * 2, 16), |
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320 ) |
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321 elif len(value) == 6: |
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322 return ( |
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323 int(value[0:2], 16), |
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324 int(value[2:4], 16), |
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325 int(value[4:6], 16), |
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326 ) |
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327 else: |
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328 raise ValueError() |
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329 |
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330 |
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331 def select_text_color(r, g, b): |
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332 """ |
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333 Choose a suitable color for the inverse text style. |
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334 |
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335 :param r: The amount of red (an integer between 0 and 255). |
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336 :param g: The amount of green (an integer between 0 and 255). |
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337 :param b: The amount of blue (an integer between 0 and 255). |
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338 :returns: A CSS color in hexadecimal notation (a string). |
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339 |
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340 In inverse mode the color that is normally used for the text is instead |
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341 used for the background, however this can render the text unreadable. The |
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342 purpose of :func:`select_text_color()` is to make an effort to select a |
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343 suitable text color. Based on http://stackoverflow.com/a/3943023/112731. |
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344 """ |
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345 return '#000' if (r * 0.299 + g * 0.587 + b * 0.114) > 186 else '#FFF' |
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346 |
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347 |
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348 class ColoredCronMailer(object): |
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349 |
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350 """ |
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351 Easy to use integration between :mod:`coloredlogs` and the UNIX ``cron`` daemon. |
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352 |
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353 By using :class:`ColoredCronMailer` as a context manager in the command |
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354 line interface of your Python program you make it trivially easy for users |
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355 of your program to opt in to HTML output under ``cron``: The only thing the |
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356 user needs to do is set ``CONTENT_TYPE="text/html"`` in their crontab! |
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357 |
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358 Under the hood this requires quite a bit of magic and I must admit that I |
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359 developed this code simply because I was curious whether it could even be |
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360 done :-). It requires my :mod:`capturer` package which you can install |
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361 using ``pip install 'coloredlogs[cron]'``. The ``[cron]`` extra will pull |
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362 in the :mod:`capturer` 2.4 or newer which is required to capture the output |
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363 while silencing it - otherwise you'd get duplicate output in the emails |
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364 sent by ``cron``. |
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365 """ |
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366 |
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367 def __init__(self): |
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368 """Initialize output capturing when running under ``cron`` with the correct configuration.""" |
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369 self.is_enabled = 'text/html' in os.environ.get('CONTENT_TYPE', 'text/plain') |
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370 self.is_silent = False |
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371 if self.is_enabled: |
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372 # We import capturer here so that the coloredlogs[cron] extra |
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373 # isn't required to use the other functions in this module. |
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374 from capturer import CaptureOutput |
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375 self.capturer = CaptureOutput(merged=True, relay=False) |
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376 |
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377 def __enter__(self): |
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378 """Start capturing output (when applicable).""" |
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379 if self.is_enabled: |
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380 self.capturer.__enter__() |
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381 return self |
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382 |
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383 def __exit__(self, exc_type=None, exc_value=None, traceback=None): |
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384 """Stop capturing output and convert the output to HTML (when applicable).""" |
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385 if self.is_enabled: |
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386 if not self.is_silent: |
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387 # Only call output() when we captured something useful. |
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388 text = self.capturer.get_text() |
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389 if text and not text.isspace(): |
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390 output(convert(text)) |
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391 self.capturer.__exit__(exc_type, exc_value, traceback) |
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392 |
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393 def silence(self): |
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394 """ |
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395 Tell :func:`__exit__()` to swallow all output (things will be silent). |
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396 |
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397 This can be useful when a Python program is written in such a way that |
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398 it has already produced output by the time it becomes apparent that |
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399 nothing useful can be done (say in a cron job that runs every few |
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400 minutes :-p). By calling :func:`silence()` the output can be swallowed |
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401 retroactively, avoiding useless emails from ``cron``. |
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402 """ |
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403 self.is_silent = True |