- main problem in moving stuff from yaml/py to yaml was that

  parser.py clashes with built-in parser module (CPython, C-module)
  which is inlucded from pkg_resources/__init__.py
- no C compile yet

1 files changed, 80 insertions, 0 deletions

diff --git a/error.py b/error.py
new file mode 100644
index 0000000..2b76904
--- /dev/null
+++ b/error.py
@@ -0,0 +1,80 @@
+from __future__ import absolute_import
+
+__all__ = ['Mark', 'YAMLError', 'MarkedYAMLError']
+
+from .compat import utf8
+
+
+class Mark(object):
+    def __init__(self, name, index, line, column, buffer, pointer):
+        self.name = name
+        self.index = index
+        self.line = line
+        self.column = column
+        self.buffer = buffer
+        self.pointer = pointer
+
+    def get_snippet(self, indent=4, max_length=75):
+        if self.buffer is None:
+            return None
+        head = ''
+        start = self.pointer
+        while (start > 0 and
+               self.buffer[start-1] not in u'\0\r\n\x85\u2028\u2029'):
+            start -= 1
+            if self.pointer-start > max_length/2-1:
+                head = ' ... '
+                start += 5
+                break
+        tail = ''
+        end = self.pointer
+        while (end < len(self.buffer) and
+               self.buffer[end] not in u'\0\r\n\x85\u2028\u2029'):
+            end += 1
+            if end-self.pointer > max_length/2-1:
+                tail = ' ... '
+                end -= 5
+                break
+        snippet = utf8(self.buffer[start:end])
+        return ' '*indent + head + snippet + tail + '\n' \
+               + ' '*(indent+self.pointer-start+len(head)) + '^'
+
+    def __str__(self):
+        snippet = self.get_snippet()
+        where = "  in \"%s\", line %d, column %d"   \
+                % (self.name, self.line+1, self.column+1)
+        if snippet is not None:
+            where += ":\n"+snippet
+        return where
+
+
+class YAMLError(Exception):
+    pass
+
+
+class MarkedYAMLError(YAMLError):
+    def __init__(self, context=None, context_mark=None,
+                 problem=None, problem_mark=None, note=None):
+        self.context = context
+        self.context_mark = context_mark
+        self.problem = problem
+        self.problem_mark = problem_mark
+        self.note = note
+
+    def __str__(self):
+        lines = []
+        if self.context is not None:
+            lines.append(self.context)
+        if self.context_mark is not None  \
+           and (self.problem is None or self.problem_mark is None
+                or self.context_mark.name != self.problem_mark.name
+                or self.context_mark.line != self.problem_mark.line
+                or self.context_mark.column != self.problem_mark.column):
+            lines.append(str(self.context_mark))
+        if self.problem is not None:
+            lines.append(self.problem)
+        if self.problem_mark is not None:
+            lines.append(str(self.problem_mark))
+        if self.note is not None:
+            lines.append(self.note)
+        return '\n'.join(lines)