75 lines
1.8 KiB
Python
75 lines
1.8 KiB
Python
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# Cache management for info file processing.
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# The function get_node() is the standard interface;
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# its signature is the same as ifile.get_node() but it uses
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# the cache and supports indirect tag tables.
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import string
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import ifile
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from ifile import NoSuchNode, NoSuchFile
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import itags
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# Special hack to save the cache when using reload().
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# This can just be "cache = {}" in a production version.
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#
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try:
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dummy = cache
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del dummy
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except NameError:
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cache = {}
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# Clear the entire cache.
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#
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def resetcache():
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for key in cache.keys():
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del cache[key]
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# Clear the node info from the cache (the most voluminous data).
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#
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def resetnodecache():
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for key in cache.keys():
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tags, nodes = cache[key]
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cache[key] = tags, {}
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# Get a node.
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#
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def get_node(curfile, ref):
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file, node = ifile.parse_ref(curfile, ref)
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file = string.lower(file)
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node = string.lower(node)
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if node == '*':
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# Don't cache whole file references;
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# reading the data is faster than displaying it anyway.
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return ifile.get_whole_file(file) # May raise NoSuchFile
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if not cache.has_key(file):
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cache[file] = get_tags(file), {} # May raise NoSuchFile
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tags, nodes = cache[file]
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if not nodes.has_key(node):
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if not tags.has_key(node):
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raise NoSuchNode, ref
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file1, offset, line = tags[node]
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if not file1:
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file1 = file
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file1, node1, header, menu, footnotes, text = \
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ifile.get_file_node(file1, offset, node)
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nodes[node] = file, node1, header, menu, footnotes, text
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return nodes[node]
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# Get the tag table for a file.
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# Either construct one or get the one found in the file.
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# Raise NoSuchFile if the file isn't found.
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#
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def get_tags(file):
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f = ifile.try_open(file) # May raise NoSuchFile
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tags = itags.get_tags(f)
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if not tags:
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###print 'Scanning file...'
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f.seek(0)
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tags = ifile.make_tags(f)
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return tags
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