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42 lines
1.4 KiB
42 lines
1.4 KiB
// Shared `cc|` correlation grammar (#882): one allocator and one splitter for
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// every CLI path - the repeater text-message CLI (RepeaterCommandService) and
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// the local frame-66 console (LocalCliService). The grammar is the device's:
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// a 3-char token ending in `|`, reflected at the start of the reply when the
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// command carried one.
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/// Allocates `XX|` correlation tokens: two uppercase hex digits and a pipe,
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/// cycling through 256 values and skipping any currently in flight.
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class PrefixAllocator {
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int _counter = 0;
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String next(Set<String> inUse) {
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for (var i = 0; i < 256; i++) {
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final value = _counter++ & 0xFF;
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final token = '${value.toRadixString(16).padLeft(2, '0').toUpperCase()}|';
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if (!inUse.contains(token)) return token;
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}
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return '00|';
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}
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}
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/// A reply split into its reflected correlation token and payload.
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class Correlated {
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const Correlated({required this.prefix, required this.payload});
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final String? prefix;
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final String payload;
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}
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/// Splits [raw] on the positional prefix rule (third character `|`). The
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/// payload keeps its leading whitespace trimmed, matching the repeater path's
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/// long-standing behavior.
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Correlated splitCorrelated(String raw) {
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if (raw.length >= 3 && raw[2] == '|') {
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return Correlated(
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prefix: raw.substring(0, 3),
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payload: raw.substring(3).trimLeft(),
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);
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}
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return Correlated(prefix: null, payload: raw);
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}
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