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//! Bounded, single-line editable chrome. Offsets are UTF-8 byte offsets.
const std = @import("std");
const modal = @import("modal.zig");
pub const Line = struct {
text: [@import("memory.zig").limits.max_tag_tail]u8 = undefined,
len: usize = 0,
custom: bool = false,
saved_col: ?u16 = null,
pub fn slice(self: *const Line, fallback: []const u8) []const u8 {
return if (self.custom) self.text[0..self.len] else fallback;
}
pub fn set(self: *Line, bytes: []const u8) bool {
if (bytes.len > self.text.len or std.mem.indexOfAny(u8, bytes, "\r\n\x00") != null or !std.unicode.utf8ValidateSlice(bytes)) return false;
@memcpy(self.text[0..bytes.len], bytes);
self.len = bytes.len;
self.custom = true;
return true;
}
pub fn replace(self: *Line, fallback: []const u8, lo: usize, hi: usize, bytes: []const u8) bool {
const current = self.slice(fallback);
if (lo > hi or hi > current.len) return false;
var next: [@import("memory.zig").limits.max_tag_tail]u8 = undefined;
const size = lo + bytes.len + current.len - hi;
if (size > next.len) return false;
@memcpy(next[0..lo], current[0..lo]);
@memcpy(next[lo..][0..bytes.len], bytes);
@memcpy(next[lo + bytes.len ..][0 .. current.len - hi], current[hi..]);
return self.set(next[0..size]);
}
};
test "tag replacement is atomic and keeps UTF-8 intact" {
var line: Line = .{};
try std.testing.expect(line.replace("New Find", 4, 8, "Grep"));
try std.testing.expectEqualStrings("New Grep", line.slice(""));
try std.testing.expect(!line.replace("", 0, 0, "bad\nline"));
try std.testing.expectEqualStrings("New Grep", line.slice(""));
try std.testing.expect(line.set("é界"));
try std.testing.expect(line.replace("", 0, modal.nextGrapheme(line.slice(""), 0), ""));
try std.testing.expectEqualStrings("界", line.slice(""));
}
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