Function replacementSize [src]

Calculate the size needed in an output buffer to perform a replacement. The needle must not be empty.

Prototype

pub fn replacementSize(comptime T: type, input: []const T, needle: []const T, replacement: []const T) usize

Parameters

T: typeinput: []const Tneedle: []const Treplacement: []const T

Example

 test replacementSize {
    try testing.expect(replacementSize(u8, "All your base are belong to us", "base", "Zig") == 29);
    try testing.expect(replacementSize(u8, "Favor reading code over writing code.", "code", "") == 29);
    try testing.expect(replacementSize(u8, "Only one obvious way to do things.", "things.", "things in Zig.") == 41);

    // Empty needle is not allowed but input may be empty.
    try testing.expect(replacementSize(u8, "", "x", "y") == 0);

    // Adjacent replacements.
    try testing.expect(replacementSize(u8, "\\n\\n", "\\n", "\n") == 2);
    try testing.expect(replacementSize(u8, "abbba", "b", "cd") == 8);
}

Source

  pub fn replacementSize(comptime T: type, input: []const T, needle: []const T, replacement: []const T) usize {
    // Empty needle will loop forever.
    assert(needle.len > 0);

    var i: usize = 0;
    var size: usize = input.len;
    while (i < input.len) {
        if (mem.startsWith(T, input[i..], needle)) {
            size = size - needle.len + replacement.len;
            i += needle.len;
        } else {
            i += 1;
        }
    }

    return size;
}  