81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
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"""Extensible attributed text format for representing pyglet formatted
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documents.
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"""
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import re
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import ast
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import pyglet
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_pattern = re.compile(r"""
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(?P<escape_hex>\{\#x(?P<escape_hex_val>[0-9a-fA-F]+)\})
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| (?P<escape_dec>\{\#(?P<escape_dec_val>[0-9]+)\})
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| (?P<escape_lbrace>\{\{)
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| (?P<escape_rbrace>\}\})
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| (?P<attr>\{
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(?P<attr_name>[^ \{\}]+)\s+
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(?P<attr_val>[^\}]+)\})
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| (?P<nl_hard1>\n(?=[ \t]))
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| (?P<nl_hard2>\{\}\n)
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| (?P<nl_soft>\n(?=\S))
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| (?P<nl_para>\n\n+)
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| (?P<text>[^\{\}\n]+)
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""", re.VERBOSE | re.DOTALL)
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class AttributedTextDecoder(pyglet.text.DocumentDecoder):
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def __init__(self):
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self.doc = pyglet.text.document.FormattedDocument()
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self.length = 0
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self.attributes = {}
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def decode(self, text, location=None):
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next_trailing_space = True
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trailing_newline = True
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for m in _pattern.finditer(text):
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group = m.lastgroup
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trailing_space = True
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if group == 'text':
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t = m.group('text')
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self.append(t)
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trailing_space = t.endswith(' ')
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trailing_newline = False
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elif group == 'nl_soft':
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if not next_trailing_space:
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self.append(' ')
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trailing_newline = False
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elif group in ('nl_hard1', 'nl_hard2'):
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self.append('\n')
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trailing_newline = True
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elif group == 'nl_para':
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self.append(m.group('nl_para')[1:]) # ignore the first \n
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trailing_newline = True
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elif group == 'attr':
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value = ast.literal_eval(m.group('attr_val'))
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name = m.group('attr_name')
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if name[0] == '.':
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if trailing_newline:
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self.attributes[name[1:]] = value
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else:
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self.doc.set_paragraph_style(self.length, self.length, {name[1:]: value})
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else:
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self.attributes[name] = value
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elif group == 'escape_dec':
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self.append(chr(int(m.group('escape_dec_val'))))
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elif group == 'escape_hex':
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self.append(chr(int(m.group('escape_hex_val'), 16)))
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elif group == 'escape_lbrace':
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self.append('{')
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elif group == 'escape_rbrace':
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self.append('}')
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next_trailing_space = trailing_space
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return self.doc
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def append(self, text):
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self.doc.insert_text(self.length, text, self.attributes)
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self.length += len(text)
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self.attributes.clear()
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