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authorThomas Graf <tgraf@suug.ch>2005-06-23 20:59:16 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-23 20:59:16 -0700
commit6408f79cce401e1bfecf923e7156f84f96e021e3 (patch)
tree203624ffacf60d364293adc47d2f59f6ba81dd35 /lib/Kconfig
parentdf3fb93ad9ec0b20c785c0ad82d42d159a1af272 (diff)
[LIB]: Naive finite state machine based textsearch
A finite state machine consists of n states (struct ts_fsm_token) representing the pattern as a finite automation. The data is read sequentially on a octet basis. Every state token specifies the number of recurrences and the type of value accepted which can be either a specific character or ctype based set of characters. The available type of recurrences include 1, (0|1), [0 n], and [1 n]. The algorithm differs between strict/non-strict mode specyfing whether the pattern has to start at the first octect. Strict mode is enabled by default and can be disabled by inserting TS_FSM_HEAD_IGNORE as the first token in the chain. The runtime performance of the algorithm should be around O(n), however while in strict mode the average runtime can be better. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/Kconfig')
-rw-r--r--lib/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 16b8fa2175e4..455833a9e31a 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -80,4 +80,15 @@ config TEXTSEARCH_KMP
To compile this code as a module, choose M here: the
module will be called ts_kmp.
+config TEXTSEARCH_FSM
+ depends on TEXTSEARCH
+ tristate "Finite state machine"
+ help
+ Say Y here if you want to be able to search text using a
+ naive finite state machine approach implementing a subset
+ of regular expressions.
+
+ To compile this code as a module, choose M here: the
+ module will be called ts_fsm.
+
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