120 lines
3.5 KiB
Python
120 lines
3.5 KiB
Python
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# vim:fileencoding=utf-8:noet
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from __future__ import (unicode_literals, division, absolute_import, print_function)
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from powerline.lint.markedjson import nodes
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from powerline.lint.markedjson import events
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from powerline.lint.markedjson.error import MarkedError
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__all__ = ['Composer', 'ComposerError']
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class ComposerError(MarkedError):
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pass
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class Composer:
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def __init__(self):
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pass
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def check_node(self):
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# Drop the STREAM-START event.
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if self.check_event(events.StreamStartEvent):
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self.get_event()
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# If there are more documents available?
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return not self.check_event(events.StreamEndEvent)
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def get_node(self):
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# Get the root node of the next document.
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if not self.check_event(events.StreamEndEvent):
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return self.compose_document()
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def get_single_node(self):
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# Drop the STREAM-START event.
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self.get_event()
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# Compose a document if the stream is not empty.
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document = None
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if not self.check_event(events.StreamEndEvent):
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document = self.compose_document()
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# Ensure that the stream contains no more documents.
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if not self.check_event(events.StreamEndEvent):
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event = self.get_event()
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raise ComposerError(
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'expected a single document in the stream',
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document.start_mark,
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'but found another document',
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event.start_mark
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)
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# Drop the STREAM-END event.
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self.get_event()
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return document
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def compose_document(self):
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# Drop the DOCUMENT-START event.
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self.get_event()
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# Compose the root node.
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node = self.compose_node(None, None)
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# Drop the DOCUMENT-END event.
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self.get_event()
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return node
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def compose_node(self, parent, index):
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self.descend_resolver(parent, index)
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if self.check_event(events.ScalarEvent):
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node = self.compose_scalar_node()
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elif self.check_event(events.SequenceStartEvent):
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node = self.compose_sequence_node()
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elif self.check_event(events.MappingStartEvent):
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node = self.compose_mapping_node()
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self.ascend_resolver()
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return node
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def compose_scalar_node(self):
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event = self.get_event()
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tag = event.tag
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if tag is None or tag == '!':
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tag = self.resolve(nodes.ScalarNode, event.value, event.implicit, event.start_mark)
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node = nodes.ScalarNode(tag, event.value, event.start_mark, event.end_mark, style=event.style)
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return node
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def compose_sequence_node(self):
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start_event = self.get_event()
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tag = start_event.tag
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if tag is None or tag == '!':
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tag = self.resolve(nodes.SequenceNode, None, start_event.implicit)
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node = nodes.SequenceNode(tag, [], start_event.start_mark, None, flow_style=start_event.flow_style)
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index = 0
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while not self.check_event(events.SequenceEndEvent):
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node.value.append(self.compose_node(node, index))
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index += 1
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end_event = self.get_event()
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node.end_mark = end_event.end_mark
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return node
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def compose_mapping_node(self):
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start_event = self.get_event()
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tag = start_event.tag
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if tag is None or tag == '!':
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tag = self.resolve(nodes.MappingNode, None, start_event.implicit)
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node = nodes.MappingNode(tag, [], start_event.start_mark, None, flow_style=start_event.flow_style)
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while not self.check_event(events.MappingEndEvent):
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# key_event = self.peek_event()
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item_key = self.compose_node(node, None)
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# if item_key in node.value:
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# raise ComposerError('while composing a mapping', start_event.start_mark,
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# 'found duplicate key', key_event.start_mark)
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item_value = self.compose_node(node, item_key)
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# node.value[item_key] = item_value
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node.value.append((item_key, item_value))
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end_event = self.get_event()
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node.end_mark = end_event.end_mark
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return node
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