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22974fbe8e
This is a replacement for pending CL 2219042. It only contains the raw suffixarray functionality with two methods: - New create a new index from some data - Lookup lookup occurences of a bytes slice in the data Any other functionality (dealing with multiple data sets and the corresponding position lists) is generic and doesn't have to be part of this package. Known performance bug: This implementation works fine for data sets up to several megabytes as long as it doesn't contain very long contiguous sequences of equal bytes. For instance, index creation for all .go files under GOROOT (250KLOCs, approx. 9MB) takes ~50s on 2.66 GHz Intel Xeon as long as test/fixedbugs/257.go is excluded. With that file, index creation times takes several days. 257.go contains a string of 1M smiley faces. There are more sophisticated suffixarray creation algorithms which can handle very long common prefixes. The implementation can be updated w/o the need to change the interface. R=rsc, r, PeterGo CC=golang-dev https://golang.org/cl/2265041 |
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