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Add comment to clearify why the first/last element in preprocess is

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dec05eba 2020-09-05 21:15:44 +02:00
parent 0a016e8fc2
commit 8af1f8ba1a
1 changed files with 4 additions and 0 deletions
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4
lib/std/mem.zig
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@ -876,6 +876,8 @@ fn boyerMooreHorspoolPreprocessReverse(pattern: []const u8, table: *[256]usize)
}
var i: usize = pattern.len - 1;
// The first item is intentionally ignored and the skip size will be pattern.len.
// This is the standard way boyer-moore-horspool is implemented.
while (i > 0) : (i -= 1) {
table[pattern[i]] = i;
}
@ -887,6 +889,8 @@ fn boyerMooreHorspoolPreprocess(pattern: []const u8, table: *[256]usize) void {
}
var i: usize = 0;
// The last item is intentionally ignored and the skip size will be pattern.len.
// This is the standard way boyer-moore-horspool is implemented.
while (i < pattern.len - 1) : (i += 1) {
table[pattern[i]] = pattern.len - 1 - i;
}