tiny.smg.analysis.paging

1const std = @import("std");23pub fn sliceEnd(len: usize, stop: i64) usize {4    if (stop >= 0) {5        const value = std.math.cast(usize, stop) orelse return len;6        return @min(value, len);7    }8    if (stop == std.math.minInt(i64)) return 0;9    const drop = std.math.cast(usize, -stop) orelse return 0;10    if (drop >= len) return 0;11    return len - drop;12}1314pub fn lengthGreaterThanStop(len: usize, stop: i64) bool {15    return sliceEnd(len, stop) < len;16}1718pub fn remainingAfterStop(len: usize, stop: i64) usize {19    return len - sliceEnd(len, stop);20}2122test "slice end clamps stops" {23    try std.testing.expectEqual(@as(usize, 5), sliceEnd(10, 5));24    try std.testing.expectEqual(@as(usize, 10), sliceEnd(10, 15));25    try std.testing.expectEqual(@as(usize, 7), sliceEnd(10, -3));26    try std.testing.expectEqual(@as(usize, 0), sliceEnd(10, -10));27    try std.testing.expectEqual(@as(usize, 0), sliceEnd(10, std.math.minInt(i64)));28    try std.testing.expectEqual(@as(usize, 10), sliceEnd(10, std.math.maxInt(i64)));29}3031test "remaining count matches slice end" {32    try std.testing.expect(!lengthGreaterThanStop(10, 10));33    try std.testing.expect(lengthGreaterThanStop(10, 9));34    try std.testing.expect(lengthGreaterThanStop(10, -3));35    try std.testing.expect(!lengthGreaterThanStop(0, -3));36    try std.testing.expectEqual(@as(usize, 5), remainingAfterStop(10, 5));37    try std.testing.expectEqual(@as(usize, 3), remainingAfterStop(10, -3));38    try std.testing.expectEqual(@as(usize, 10), remainingAfterStop(10, -20));39    try std.testing.expectEqual(@as(usize, 10), remainingAfterStop(10, std.math.minInt(i64)));40    try std.testing.expectEqual(@as(usize, 0), remainingAfterStop(10, std.math.maxInt(i64)));41}

1pub const paging = @import("paging.zig");