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terminal: split input to fit output chunks

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This commit is contained in:
Mitchell Hashimoto
2024-02-04 11:13:49 -08:00
parent 351d9eb402
commit 449d3b49a4
1 changed files with 19 additions and 4 deletions
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23
src/terminal/stream.zig
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@ -53,6 +53,24 @@ pub fn Stream(comptime Handler: type) type {
/// Process a string of characters.
pub fn nextSlice(self: *Self, input: []const u8) !void {
// This is the maximum number of codepoints we can decode
// at one time for this function call. This is somewhat arbitrary
// so if someone can demonstrate a better number then we can switch.
var cp_buf: [4096]u32 = undefined;
// Split the input into chunks that fit into cp_buf.
var i: usize = 0;
while (true) {
const len = @min(cp_buf.len, input.len - i);
try self.nextSliceCapped(input[i .. i + len], &cp_buf);
i += len;
if (i >= input.len) break;
}
}
fn nextSliceCapped(self: *Self, input: []const u8, cp_buf: []u32) !void {
assert(input.len <= cp_buf.len);
var offset: usize = 0;
// If we have a partial UTF-8 sequence then we process manually.
@ -69,14 +87,11 @@ pub fn Stream(comptime Handler: type) type {
}
}
// TODO: do something better
var cp_buf: [4096]u32 = undefined;
// If we're in the ground state then we can use SIMD to process
// input until we see an ESC (0x1B), since all other characters
// up to that point are just UTF-8.
while (self.parser.state == .ground and offset < input.len) {
const res = simd.vt.utf8DecodeUntilControlSeq(input[offset..], &cp_buf);
const res = simd.vt.utf8DecodeUntilControlSeq(input[offset..], cp_buf);
for (cp_buf[0..res.decoded]) |cp| {
if (cp < 0xF) {
try self.execute(@intCast(cp));