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ESC \\ (includes XTVersion responses)\n\tif (afterEsc.startsWith(\"P\")) {\n\t\treturn isCompleteDcsSequence(data);\n\t}\n\n\t// APC sequences: ESC _ ... ESC \\ (includes Kitty graphics responses)\n\tif (afterEsc.startsWith(\"_\")) {\n\t\treturn isCompleteApcSequence(data);\n\t}\n\n\t// SS3 sequences: ESC O\n\tif (afterEsc.startsWith(\"O\")) {\n\t\t// ESC O followed by a single character\n\t\treturn afterEsc.length >= 2 ? \"complete\" : \"incomplete\";\n\t}\n\n\t// Meta key sequences: ESC followed by a single character\n\tif (afterEsc.length === 1) {\n\t\treturn \"complete\";\n\t}\n\n\t// Unknown escape sequence - treat as complete\n\treturn \"complete\";\n}\n\n/**\n * Check if CSI sequence is complete\n * CSI sequences: ESC [ ... followed by a final byte (0x40-0x7E)\n */\nfunction isCompleteCsiSequence(data: string): \"complete\" | \"incomplete\" {\n\tif (!data.startsWith(`${ESC}[`)) {\n\t\treturn \"complete\";\n\t}\n\n\t// Need at least ESC [ and one more character\n\tif (data.length < 3) {\n\t\treturn \"incomplete\";\n\t}\n\n\tconst payload = data.slice(2);\n\n\t// CSI sequences end with a byte in the range 0x40-0x7E (@-~)\n\t// This includes all letters and several special characters\n\tconst lastChar = payload[payload.length - 1];\n\tconst lastCharCode = lastChar.charCodeAt(0);\n\n\tif (lastCharCode >= 0x40 && lastCharCode <= 0x7e) {\n\t\t// Special handling for SGR mouse sequences\n\t\t// Format: ESC[<B;X;Ym or ESC[<B;X;YM\n\t\tif (payload.startsWith(\"<\")) {\n\t\t\t// Must have format: <digits;digits;digits[Mm]\n\t\t\tconst mouseMatch = /^<\\d+;\\d+;\\d+[Mm]$/.test(payload);\n\t\t\tif (mouseMatch) {\n\t\t\t\treturn \"complete\";\n\t\t\t}\n\t\t\t// If it ends with M or m but doesn't match the pattern, still incomplete\n\t\t\tif (lastChar === \"M\" || lastChar === \"m\") {\n\t\t\t\t// Check if we have the right structure\n\t\t\t\tconst parts = payload.slice(1, -1).split(\";\");\n\t\t\t\tif (parts.length === 3 && parts.every((p) => /^\\d+$/.test(p))) {\n\t\t\t\t\treturn \"complete\";\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn \"incomplete\";\n\t\t}\n\n\t\treturn \"complete\";\n\t}\n\n\treturn \"incomplete\";\n}\n\n/**\n * Check if OSC sequence is complete\n * OSC sequences: ESC ] ... ST (where ST is ESC \\ or BEL)\n */\nfunction isCompleteOscSequence(data: string): \"complete\" | \"incomplete\" {\n\tif (!data.startsWith(`${ESC}]`)) {\n\t\treturn \"complete\";\n\t}\n\n\t// OSC sequences end with ST (ESC \\) or BEL (\\x07)\n\tif (data.endsWith(`${ESC}\\\\`) || data.endsWith(\"\\x07\")) {\n\t\treturn \"complete\";\n\t}\n\n\treturn \"incomplete\";\n}\n\n/**\n * Check if DCS (Device Control String) sequence is complete\n * DCS sequences: ESC P ... ST (where ST is ESC \\)\n * Used for XTVersion responses like ESC P >| ... ESC \\\n */\nfunction isCompleteDcsSequence(data: string): \"complete\" | \"incomplete\" {\n\tif (!data.startsWith(`${ESC}P`)) {\n\t\treturn \"complete\";\n\t}\n\n\t// DCS sequences end with ST (ESC \\)\n\tif (data.endsWith(`${ESC}\\\\`)) {\n\t\treturn \"complete\";\n\t}\n\n\treturn \"incomplete\";\n}\n\n/**\n * Check if APC (Application Program Command) sequence is complete\n * APC sequences: ESC _ ... ST (where ST is ESC \\)\n * Used for Kitty graphics responses like ESC _ G ... ESC \\\n */\nfunction isCompleteApcSequence(data: string): \"complete\" | \"incomplete\" {\n\tif (!data.startsWith(`${ESC}_`)) {\n\t\treturn \"complete\";\n\t}\n\n\t// APC sequences end with ST (ESC \\)\n\tif (data.endsWith(`${ESC}\\\\`)) {\n\t\treturn \"complete\";\n\t}\n\n\treturn \"incomplete\";\n}\n\n/**\n * Split accumulated buffer into complete sequences\n */\nfunction parseUnmodifiedKittyPrintableCodepoint(sequence: string): number | undefined {\n\tconst match = sequence.match(/^\\x1b\\[(\\d+)(?::\\d*)?(?::\\d+)?u$/);\n\tif (!match) return undefined;\n\n\tconst codepoint = parseInt(match[1]!, 10);\n\treturn codepoint >= 32 ? codepoint : undefined;\n}\n\nfunction extractCompleteSequences(buffer: string): { sequences: string[]; remainder: string } {\n\tconst sequences: string[] = [];\n\tlet pos = 0;\n\n\twhile (pos < buffer.length) {\n\t\tconst remaining = buffer.slice(pos);\n\n\t\t// Try to extract a sequence starting at this position\n\t\tif (remaining.startsWith(ESC)) {\n\t\t\t// Find the end of this escape sequence\n\t\t\tlet seqEnd = 1;\n\t\t\twhile (seqEnd <= remaining.length) {\n\t\t\t\tconst candidate = remaining.slice(0, seqEnd);\n\t\t\t\tconst status = isCompleteSequence(candidate);\n\n\t\t\t\tif (status === \"complete\") {\n\t\t\t\t\tsequences.push(candidate);\n\t\t\t\t\tpos += seqEnd;\n\t\t\t\t\tbreak;\n\t\t\t\t} else if (status === \"incomplete\") {\n\t\t\t\t\tseqEnd++;\n\t\t\t\t} else {\n\t\t\t\t\t// Should not happen when starting with ESC\n\t\t\t\t\tsequences.push(candidate);\n\t\t\t\t\tpos += seqEnd;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (seqEnd > remaining.length) {\n\t\t\t\treturn { sequences, remainder: remaining };\n\t\t\t}\n\t\t} else {\n\t\t\t// Not an escape sequence - take a single character\n\t\t\tsequences.push(remaining[0]!);\n\t\t\tpos++;\n\t\t}\n\t}\n\n\treturn { sequences, remainder: \"\" };\n}\n\nexport type StdinBufferOptions = {\n\t/**\n\t * Maximum time to wait for sequence completion (default: 10ms)\n\t * After this time, the buffer is flushed even if incomplete\n\t */\n\ttimeout?: number;\n};\n\nexport type StdinBufferEventMap = {\n\tdata: [string];\n\tpaste: [string];\n};\n\n/**\n * Buffers stdin input and emits complete sequences via the 'data' event.\n * Handles partial escape sequences that arrive across multiple chunks.\n */\nexport class StdinBuffer extends EventEmitter<StdinBufferEventMap> {\n\tprivate buffer: string = \"\";\n\tprivate timeout: ReturnType<typeof setTimeout> | null = null;\n\tprivate readonly timeoutMs: number;\n\tprivate pasteMode: boolean = false;\n\tprivate pasteBuffer: string = \"\";\n\tprivate pendingKittyPrintableCodepoint: number | undefined;\n\n\tconstructor(options: StdinBufferOptions = {}) {\n\t\tsuper();\n\t\tthis.timeoutMs = options.timeout ?? 10;\n\t}\n\n\tpublic process(data: string | Buffer): void {\n\t\t// Clear any pending timeout\n\t\tif (this.timeout) {\n\t\t\tclearTimeout(this.timeout);\n\t\t\tthis.timeout = null;\n\t\t}\n\n\t\t// Handle high-byte conversion (for compatibility with parseKeypress)\n\t\t// If buffer has single byte > 127, convert to ESC + (byte - 128)\n\t\tlet str: string;\n\t\tif (Buffer.isBuffer(data)) {\n\t\t\tif (data.length === 1 && data[0]! > 127) {\n\t\t\t\tconst byte = data[0]! - 128;\n\t\t\t\tstr = `\\x1b${String.fromCharCode(byte)}`;\n\t\t\t} else {\n\t\t\t\tstr = data.toString();\n\t\t\t}\n\t\t} else {\n\t\t\tstr = data;\n\t\t}\n\n\t\tif (str.length === 0 && this.buffer.length === 0) {\n\t\t\tthis.emitDataSequence(\"\");\n\t\t\treturn;\n\t\t}\n\n\t\tthis.buffer += str;\n\n\t\tif (this.pasteMode) {\n\t\t\tthis.pasteBuffer += this.buffer;\n\t\t\tthis.buffer = \"\";\n\n\t\t\tconst endIndex = this.pasteBuffer.indexOf(BRACKETED_PASTE_END);\n\t\t\tif (endIndex !== -1) {\n\t\t\t\tconst pastedContent = this.pasteBuffer.slice(0, endIndex);\n\t\t\t\tconst remaining = this.pasteBuffer.slice(endIndex + BRACKETED_PASTE_END.length);\n\n\t\t\t\tthis.pasteMode = false;\n\t\t\t\tthis.pasteBuffer = \"\";\n\t\t\t\tthis.pendingKittyPrintableCodepoint = undefined;\n\n\t\t\t\tthis.emit(\"paste\", pastedContent);\n\n\t\t\t\tif (remaining.length > 0) {\n\t\t\t\t\tthis.process(remaining);\n\t\t\t\t}\n\t\t\t}\n\t\t\treturn;\n\t\t}\n\n\t\tconst startIndex = this.buffer.indexOf(BRACKETED_PASTE_START);\n\t\tif (startIndex !== -1) {\n\t\t\tif (startIndex > 0) {\n\t\t\t\tconst beforePaste = this.buffer.slice(0, startIndex);\n\t\t\t\tconst result = extractCompleteSequences(beforePaste);\n\t\t\t\tfor (const sequence of result.sequences) {\n\t\t\t\t\tthis.emitDataSequence(sequence);\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.pendingKittyPrintableCodepoint = undefined;\n\t\t\tthis.buffer = this.buffer.slice(startIndex + BRACKETED_PASTE_START.length);\n\t\t\tthis.pasteMode = true;\n\t\t\tthis.pasteBuffer = this.buffer;\n\t\t\tthis.buffer = \"\";\n\n\t\t\tconst endIndex = this.pasteBuffer.indexOf(BRACKETED_PASTE_END);\n\t\t\tif (endIndex !== -1) {\n\t\t\t\tconst pastedContent = this.pasteBuffer.slice(0, endIndex);\n\t\t\t\tconst remaining = this.pasteBuffer.slice(endIndex + BRACKETED_PASTE_END.length);\n\n\t\t\t\tthis.pasteMode = false;\n\t\t\t\tthis.pasteBuffer = \"\";\n\t\t\t\tthis.pendingKittyPrintableCodepoint = undefined;\n\n\t\t\t\tthis.emit(\"paste\", pastedContent);\n\n\t\t\t\tif (remaining.length > 0) {\n\t\t\t\t\tthis.process(remaining);\n\t\t\t\t}\n\t\t\t}\n\t\t\treturn;\n\t\t}\n\n\t\tconst result = extractCompleteSequences(this.buffer);\n\t\tthis.buffer = result.remainder;\n\n\t\tfor (const sequence of result.sequences) {\n\t\t\tthis.emitDataSequence(sequence);\n\t\t}\n\n\t\tif (this.buffer.length > 0) {\n\t\t\tthis.timeout = setTimeout(() => {\n\t\t\t\tconst flushed = this.flush();\n\n\t\t\t\tfor (const sequence of flushed) {\n\t\t\t\t\tthis.emitDataSequence(sequence);\n\t\t\t\t}\n\t\t\t}, this.timeoutMs);\n\t\t}\n\t}\n\n\tprivate emitDataSequence(sequence: string): void {\n\t\tconst rawCodepoint = sequence.length === 1 ? sequence.codePointAt(0) : undefined;\n\t\tif (rawCodepoint !== undefined && rawCodepoint === this.pendingKittyPrintableCodepoint) {\n\t\t\tthis.pendingKittyPrintableCodepoint = undefined;\n\t\t\treturn;\n\t\t}\n\n\t\tthis.pendingKittyPrintableCodepoint = parseUnmodifiedKittyPrintableCodepoint(sequence);\n\t\tthis.emit(\"data\", sequence);\n\t}\n\n\tflush(): string[] {\n\t\tif (this.timeout) {\n\t\t\tclearTimeout(this.timeout);\n\t\t\tthis.timeout = null;\n\t\t}\n\n\t\tif (this.buffer.length === 0) {\n\t\t\treturn [];\n\t\t}\n\n\t\tconst sequences = [this.buffer];\n\t\tthis.buffer = \"\";\n\t\tthis.pendingKittyPrintableCodepoint = undefined;\n\t\treturn sequences;\n\t}\n\n\tclear(): void {\n\t\tif (this.timeout) {\n\t\t\tclearTimeout(this.timeout);\n\t\t\tthis.timeout = null;\n\t\t}\n\t\tthis.buffer = \"\";\n\t\tthis.pasteMode = false;\n\t\tthis.pasteBuffer = \"\";\n\t\tthis.pendingKittyPrintableCodepoint = undefined;\n\t}\n\n\tgetBuffer(): string {\n\t\treturn this.buffer;\n\t}\n\n\tdestroy(): void {\n\t\tthis.clear();\n\t}\n}\n"]}