36 lines
926 B
Markdown
36 lines
926 B
Markdown
title: urlresolver
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---
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type: method
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---
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summary: Registers a custom URL resolver function.
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---
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body:
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This is very experimental API and used to register a custom URL resolver
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function with the environment. It's invoked whenever a node has matched but
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more data is left to parse. This can be used to implement virtual items.
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This works in combination with [generator :ref](../generator/) but handles the
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URL matching part of the equation.
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The registered function is invoked with a source object and a list of
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URL path segments.
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## Example
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```python
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from lektor.sourceobj import VirtualSourceObject
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class Source(VirtualSourceObject):
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@property
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def url_path(self):
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return self.parent.url_path + 'source.txt'
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@env.urlresolver
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def match_source_file(node, url_path):
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if url_path == ['source.txt'] \
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and isinstance(node, Record) \
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and not node.is_attachment:
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return Source(node)
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```
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