Commit 1b34aa1d authored by Eckhart Arnold's avatar Eckhart Arnold
Browse files

- full memoization ready

parent 1353b156
......@@ -201,16 +201,20 @@ def add_parser_guard(parser_func):
node, rest = parser_func(parser, text)
if node is None:
if location in parser.visited:
node, rest = parser.visited[location]
elif not grammar.left_recursion_encountered__:
# retrieve an earlier match result (from left recursion)
# if it exists
node, rest = parser.visited.get(location, (None, rest))
# don't overwrite any positive match (i.e. node not None) in the cache
# and don't add empty entries for parsers returning from left recursive calls!
if node is None and not grammar.left_recursion_encountered__:
# ortherwise also cache None-results
parser.visited[location] = None, rest
# in case of a recursive call saves the result of the first
# (or left-most) call that matches
# variable manipulating parsers will be excluded, though,
# because caching would interfere with changes of variable state
if grammar.last_rb__loc__ > location:
# in case of left recursion, the first recursive step that
# matches will store its result in the cache
parser.visited[location] = (node, rest)
grammar.last_node__ = node # store last node for Lookbehind parser
......@@ -52,7 +52,7 @@ def selftest(file_name):
# compile the grammar again using the result of the previous
# compilation as parser
for i in range(100):
for i in range(1000):
result = compileDSL(grammar, nil_scanner, result, transformer, compiler)
return result
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