Preview: yaml_hl.py
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//opt/alt/python37/share/doc/alt-python37-PyYAML/examples/yaml-highlight/yaml_hl.py
#!/usr/bin/python
import yaml, codecs, sys, os.path, optparse
class Style:
def __init__(self, header=None, footer=None,
tokens=None, events=None, replaces=None):
self.header = header
self.footer = footer
self.replaces = replaces
self.substitutions = {}
for domain, Class in [(tokens, 'Token'), (events, 'Event')]:
if not domain:
continue
for key in domain:
name = ''.join([part.capitalize() for part in key.split('-')])
cls = getattr(yaml, '%s%s' % (name, Class))
value = domain[key]
if not value:
continue
start = value.get('start')
end = value.get('end')
if start:
self.substitutions[cls, -1] = start
if end:
self.substitutions[cls, +1] = end
def __setstate__(self, state):
self.__init__(**state)
yaml.add_path_resolver(u'tag:yaml.org,2002:python/object:__main__.Style',
[None], dict)
yaml.add_path_resolver(u'tag:yaml.org,2002:pairs',
[None, u'replaces'], list)
class YAMLHighlight:
def __init__(self, options):
config = yaml.full_load(file(options.config, 'rb').read())
self.style = config[options.style]
if options.input:
self.input = file(options.input, 'rb')
else:
self.input = sys.stdin
if options.output:
self.output = file(options.output, 'wb')
else:
self.output = sys.stdout
def highlight(self):
input = self.input.read()
if input.startswith(codecs.BOM_UTF16_LE):
input = unicode(input, 'utf-16-le')
elif input.startswith(codecs.BOM_UTF16_BE):
input = unicode(input, 'utf-16-be')
else:
input = unicode(input, 'utf-8')
substitutions = self.style.substitutions
tokens = yaml.scan(input)
events = yaml.parse(input)
markers = []
number = 0
for token in tokens:
number += 1
if token.start_mark.index != token.end_mark.index:
cls = token.__class__
if (cls, -1) in substitutions:
markers.append([token.start_mark.index, +2, number, substitutions[cls, -1]])
if (cls, +1) in substitutions:
markers.append([token.end_mark.index, -2, number, substitutions[cls, +1]])
number = 0
for event in events:
number += 1
cls = event.__class__
if (cls, -1) in substitutions:
markers.append([event.start_mark.index, +1, number, substitutions[cls, -1]])
if (cls, +1) in substitutions:
markers.append([event.end_mark.index, -1, number, substitutions[cls, +1]])
markers.sort()
markers.reverse()
chunks = []
position = len(input)
for index, weight1, weight2, substitution in markers:
if index < position:
chunk = input[index:position]
for substring, replacement in self.style.replaces:
chunk = chunk.replace(substring, replacement)
chunks.append(chunk)
position = index
chunks.append(substitution)
chunks.reverse()
result = u''.join(chunks)
if self.style.header:
self.output.write(self.style.header)
self.output.write(result.encode('utf-8'))
if self.style.footer:
self.output.write(self.style.footer)
if __name__ == '__main__':
parser = optparse.OptionParser()
parser.add_option('-s', '--style', dest='style', default='ascii',
help="specify the highlighting style", metavar='STYLE')
parser.add_option('-c', '--config', dest='config',
default=os.path.join(os.path.dirname(sys.argv[0]), 'yaml_hl.cfg'),
help="set an alternative configuration file", metavar='CONFIG')
parser.add_option('-i', '--input', dest='input', default=None,
help="set the input file (default: stdin)", metavar='FILE')
parser.add_option('-o', '--output', dest='output', default=None,
help="set the output file (default: stdout)", metavar='FILE')
(options, args) = parser.parse_args()
hl = YAMLHighlight(options)
hl.highlight()
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