1 files changed, 114 insertions, 0 deletions
diff --git a/python/pyyaml/examples/yaml-highlight/yaml_hl.py b/python/pyyaml/examples/yaml-highlight/yaml_hl.py
new file mode 100755
index 0000000000..d6f7bf4eb2
--- /dev/null
+++ b/python/pyyaml/examples/yaml-highlight/yaml_hl.py
@@ -0,0 +1,114 @@
+#!/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.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()
+