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feat: add Buffer.Node.byte_offset_to_line_and_col and testcase

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This commit is contained in:
CJ van den Berg 2025-09-17 22:17:00 +02:00
parent 1658c9e3b4
commit 935b178d89
Signed by: neurocyte
GPG key ID: 8EB1E1BB660E3FB9
2 changed files with 70 additions and 0 deletions
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29
src/buffer/Buffer.zig
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@ -794,6 +794,35 @@ const Node = union(enum) {
return if (found) ctx.result else error.NotFound;
}
pub fn byte_offset_to_line_and_col(self: *const Node, pos: usize, metrics: Metrics, eol_mode: EolMode) Cursor {
const ctx_ = struct {
pos: usize,
line: usize = 0,
col: usize = 0,
eol_mode: EolMode,
fn walker(ctx_: *anyopaque, egc: []const u8, wcwidth: usize, _: Metrics) Walker {
const ctx = @as(*@This(), @ptrCast(@alignCast(ctx_)));
if (egc[0] == '\n') {
ctx.pos -= switch (ctx.eol_mode) {
.lf => 1,
.crlf => @min(2, ctx.pos),
};
if (ctx.pos == 0) return Walker.stop;
ctx.line += 1;
ctx.col = 0;
} else {
ctx.pos -= @min(egc.len, ctx.pos);
if (ctx.pos == 0) return Walker.stop;
ctx.col += wcwidth;
}
return Walker.keep_walking;
}
};
var ctx: ctx_ = .{ .pos = pos + 1, .eol_mode = eol_mode };
self.walk_egc_forward(0, ctx_.walker, &ctx, metrics) catch {};
return .{ .row = ctx.line, .col = ctx.col };
}
pub fn insert_chars(
self_: *const Node,
line_: usize,

41
test/tests_buffer.zig
View file

@ -414,3 +414,44 @@ test "get_from_pos" {
const result3 = buffer.root.get_from_pos(.{ .row = 1, .col = 5 }, &result_buf, metrics());
try std.testing.expectEqualDeep(result3[0 .. line1.len - 4], line1[4..]);
}
test "byte_offset_to_line_and_col" {
const doc: []const u8 =
\\All your
\\ropes
\\are belong to
\\us!
\\All your
\\ropes
\\are belong to
\\us!
\\All your
\\ropes
\\are belong to
\\us!
;
var eol_mode: Buffer.EolMode = .lf;
var sanitized: bool = false;
const buffer = try Buffer.create(a);
defer buffer.deinit();
buffer.update(try buffer.load_from_string(doc, &eol_mode, &sanitized));
try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 0 }, buffer.root.byte_offset_to_line_and_col(0, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 8 }, buffer.root.byte_offset_to_line_and_col(8, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 0 }, buffer.root.byte_offset_to_line_and_col(9, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 2 }, buffer.root.byte_offset_to_line_and_col(11, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 4, .col = 0 }, buffer.root.byte_offset_to_line_and_col(33, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 8, .col = 0 }, buffer.root.byte_offset_to_line_and_col(66, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 11, .col = 2 }, buffer.root.byte_offset_to_line_and_col(97, metrics(), eol_mode));
eol_mode = .crlf;
try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 0 }, buffer.root.byte_offset_to_line_and_col(0, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 8 }, buffer.root.byte_offset_to_line_and_col(8, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 8 }, buffer.root.byte_offset_to_line_and_col(9, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 0 }, buffer.root.byte_offset_to_line_and_col(10, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 2 }, buffer.root.byte_offset_to_line_and_col(12, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 4, .col = 0 }, buffer.root.byte_offset_to_line_and_col(37, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 8, .col = 0 }, buffer.root.byte_offset_to_line_and_col(74, metrics(), eol_mode));
try std.testing.expectEqual(Buffer.Cursor{ .row = 11, .col = 2 }, buffer.root.byte_offset_to_line_and_col(108, metrics(), eol_mode));
}