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1
2__all__ = ['Mark', 'YAMLError', 'MarkedYAMLError']
3
4class Mark:
5
6    def __init__(self, name, index, line, column, buffer, pointer):
7        self.name = name
8        self.index = index
9        self.line = line
10        self.column = column
11        self.buffer = buffer
12        self.pointer = pointer
13
14    def get_snippet(self, indent=4, max_length=75):
15        if self.buffer is None:
16            return None
17        head = ''
18        start = self.pointer
19        while start > 0 and self.buffer[start-1] not in '\0\r\n\x85\u2028\u2029':
20            start -= 1
21            if self.pointer-start > max_length/2-1:
22                head = ' ... '
23                start += 5
24                break
25        tail = ''
26        end = self.pointer
27        while end < len(self.buffer) and self.buffer[end] not in '\0\r\n\x85\u2028\u2029':
28            end += 1
29            if end-self.pointer > max_length/2-1:
30                tail = ' ... '
31                end -= 5
32                break
33        snippet = self.buffer[start:end]
34        return ' '*indent + head + snippet + tail + '\n'  \
35                + ' '*(indent+self.pointer-start+len(head)) + '^'
36
37    def __str__(self):
38        snippet = self.get_snippet()
39        where = "  in \"%s\", line %d, column %d"   \
40                % (self.name, self.line+1, self.column+1)
41        if snippet is not None:
42            where += ":\n"+snippet
43        return where
44
45class YAMLError(Exception):
46    pass
47
48class MarkedYAMLError(YAMLError):
49
50    def __init__(self, context=None, context_mark=None,
51            problem=None, problem_mark=None, note=None):
52        self.context = context
53        self.context_mark = context_mark
54        self.problem = problem
55        self.problem_mark = problem_mark
56        self.note = note
57
58    def __str__(self):
59        lines = []
60        if self.context is not None:
61            lines.append(self.context)
62        if self.context_mark is not None  \
63            and (self.problem is None or self.problem_mark is None
64                    or self.context_mark.name != self.problem_mark.name
65                    or self.context_mark.line != self.problem_mark.line
66                    or self.context_mark.column != self.problem_mark.column):
67            lines.append(str(self.context_mark))
68        if self.problem is not None:
69            lines.append(self.problem)
70        if self.problem_mark is not None:
71            lines.append(str(self.problem_mark))
72        if self.note is not None:
73            lines.append(self.note)
74        return '\n'.join(lines)
75
76