lpc43xx: Move YAML OrderedDict code to separate module

scripts/data/lpc43xx/csv2yaml.py

@@ -4,40 +4,7 @@ import sys
 import yaml
 import csv
 from collections import OrderedDict
-
+import yaml_odict
-def repr_odict(dumper, data):
-    """
-    >>> data = OrderedDict([('foo', 'bar'), ('mumble', 'quux'), ('baz', 'gorp')])
-    >>> yaml.dump(data, default_flow_style=False)
-    '!!omap\\n- foo: bar\\n- mumble: quux\\n- baz: gorp\\n'
-    >>> yaml.dump(data, default_flow_style=True)
-    '!!omap [foo: bar, mumble: quux, baz: gorp]\\n'
-    """
-    return repr_pairs(dumper, u'tag:yaml.org,2002:omap', data.iteritems())
- 
-yaml.add_representer(OrderedDict, repr_odict)
- 
-def repr_pairs(dump, tag, sequence, flow_style=None):
-    """This is the same code as BaseRepresenter.represent_sequence(),
-    but the value passed to dump.represent_data() in the loop is a
-    dictionary instead of a tuple."""
- 
-    value = []
-    node = yaml.SequenceNode(tag, value, flow_style=flow_style)
-    if dump.alias_key is not None:
-        dump.represented_objects[dump.alias_key] = node
-    best_style = True
-    for (key, val) in sequence:
-        item = dump.represent_data({key: val})
-        if not (isinstance(item, yaml.ScalarNode) and not item.style):
-            best_style = False
-        value.append(item)
-    if flow_style is None:
-        if dump.default_flow_style is not None:
-            node.flow_style = dump.default_flow_style
-        else:
-            node.flow_style = best_style
-    return node
  
 def convert_file(fname):
     reader = csv.reader(open(fname, 'r'))

scripts/data/lpc43xx/yaml_odict.py

@@ -0,0 +1,81 @@
+import yaml
+from collections import OrderedDict
+def construct_odict(load, node):
+    """This is the same as SafeConstructor.construct_yaml_omap(),
+    except the data type is changed to OrderedDict() and setitem is
+    used instead of append in the loop.
+ 
+    >>> yaml.load('''
+    ... !!omap
+    ... - foo: bar
+    ... - mumble: quux
+    ... - baz: gorp
+    ... ''')
+    OrderedDict([('foo', 'bar'), ('mumble', 'quux'), ('baz', 'gorp')])
+ 
+    >>> yaml.load('''!!omap [ foo: bar, mumble: quux, baz : gorp ]''')
+    OrderedDict([('foo', 'bar'), ('mumble', 'quux'), ('baz', 'gorp')])
+    """
+ 
+    omap = OrderedDict()
+    yield omap
+    if not isinstance(node, yaml.SequenceNode):
+        raise yaml.constructor.ConstructorError(
+            "while constructing an ordered map",
+            node.start_mark,
+            "expected a sequence, but found %s" % node.id, node.start_mark
+        )
+    for subnode in node.value:
+        if not isinstance(subnode, yaml.MappingNode):
+            raise yaml.constructor.ConstructorError(
+                "while constructing an ordered map", node.start_mark,
+                "expected a mapping of length 1, but found %s" % subnode.id,
+                subnode.start_mark
+            )
+        if len(subnode.value) != 1:
+            raise yaml.constructor.ConstructorError(
+                "while constructing an ordered map", node.start_mark,
+                "expected a single mapping item, but found %d items" % len(subnode.value),
+                subnode.start_mark
+            )
+        key_node, value_node = subnode.value[0]
+        key = load.construct_object(key_node)
+        value = load.construct_object(value_node)
+        omap[key] = value
+ 
+yaml.add_constructor(u'tag:yaml.org,2002:omap', construct_odict)
+
+def repr_pairs(dump, tag, sequence, flow_style=None):
+    """This is the same code as BaseRepresenter.represent_sequence(),
+    but the value passed to dump.represent_data() in the loop is a
+    dictionary instead of a tuple."""
+ 
+    value = []
+    node = yaml.SequenceNode(tag, value, flow_style=flow_style)
+    if dump.alias_key is not None:
+        dump.represented_objects[dump.alias_key] = node
+    best_style = True
+    for (key, val) in sequence:
+        item = dump.represent_data({key: val})
+        if not (isinstance(item, yaml.ScalarNode) and not item.style):
+            best_style = False
+        value.append(item)
+    if flow_style is None:
+        if dump.default_flow_style is not None:
+            node.flow_style = dump.default_flow_style
+        else:
+            node.flow_style = best_style
+    return node
+
+def repr_odict(dumper, data):
+    """
+    >>> data = OrderedDict([('foo', 'bar'), ('mumble', 'quux'), ('baz', 'gorp')])
+    >>> yaml.dump(data, default_flow_style=False)
+    '!!omap\\n- foo: bar\\n- mumble: quux\\n- baz: gorp\\n'
+    >>> yaml.dump(data, default_flow_style=True)
+    '!!omap [foo: bar, mumble: quux, baz: gorp]\\n'
+    """
+    return repr_pairs(dumper, u'tag:yaml.org,2002:omap', data.iteritems())
+ 
+yaml.add_representer(OrderedDict, repr_odict)
+