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feat: add Buffer.Node.byte_offset_to_line_and_col and testcase

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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,