mirror of
https://github.com/python/cpython.git
synced 2025-10-31 10:26:02 +00:00
74 lines
1.8 KiB
Python
Executable file
74 lines
1.8 KiB
Python
Executable file
# Cache management for info file processing.
|
|
# The function get_node() is the standard interface;
|
|
# its signature is the same as ifile.get_node() but it uses
|
|
# the cache and supports indirect tag tables.
|
|
|
|
|
|
import string
|
|
import ifile
|
|
from ifile import NoSuchNode, NoSuchFile
|
|
import itags
|
|
|
|
|
|
# Special hack to save the cache when using reload().
|
|
# This can just be "cache = {}" in a production version.
|
|
#
|
|
try:
|
|
dummy = cache
|
|
del dummy
|
|
except NameError:
|
|
cache = {}
|
|
|
|
|
|
# Clear the entire cache.
|
|
#
|
|
def resetcache():
|
|
for key in cache.keys():
|
|
del cache[key]
|
|
|
|
|
|
# Clear the node info from the cache (the most voluminous data).
|
|
#
|
|
def resetnodecache():
|
|
for key in cache.keys():
|
|
tags, nodes = cache[key]
|
|
cache[key] = tags, {}
|
|
|
|
|
|
# Get a node.
|
|
#
|
|
def get_node(curfile, ref):
|
|
file, node = ifile.parse_ref(curfile, ref)
|
|
file = string.lower(file)
|
|
node = string.lower(node)
|
|
if node == '*':
|
|
# Don't cache whole file references;
|
|
# reading the data is faster than displaying it anyway.
|
|
return ifile.get_whole_file(file) # May raise NoSuchFile
|
|
if not cache.has_key(file):
|
|
cache[file] = get_tags(file), {} # May raise NoSuchFile
|
|
tags, nodes = cache[file]
|
|
if not nodes.has_key(node):
|
|
if not tags.has_key(node):
|
|
raise NoSuchNode, ref
|
|
file1, offset, line = tags[node]
|
|
if not file1:
|
|
file1 = file
|
|
file1, node1, header, menu, footnotes, text = \
|
|
ifile.get_file_node(file1, offset, node)
|
|
nodes[node] = file, node1, header, menu, footnotes, text
|
|
return nodes[node]
|
|
|
|
|
|
# Get the tag table for a file.
|
|
# Either construct one or get the one found in the file.
|
|
# Raise NoSuchFile if the file isn't found.
|
|
#
|
|
def get_tags(file):
|
|
f = ifile.try_open(file) # May raise NoSuchFile
|
|
tags = itags.get_tags(f)
|
|
if not tags:
|
|
###print 'Scanning file...'
|
|
f.seek(0)
|
|
tags = ifile.make_tags(f)
|
|
return tags
|