• Robert Griesemer's avatar
    suffixarray: a package for creating suffixarray-based indexes · 22974fbe
    Robert Griesemer authored
    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
    22974fbe
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