{"version":3,"file":"truncate.d.ts","sourceRoot":"","sources":["../../../src/harness/utils/truncate.ts"],"names":[],"mappings":"AAAA;;;;;;;;GAQG;AAEH,eAAO,MAAM,iBAAiB,OAAO,CAAC;AACtC,eAAO,MAAM,iBAAiB,QAAY,CAAC;AAC3C,eAAO,MAAM,oBAAoB,MAAM,CAAC;AAExC,MAAM,WAAW,gBAAgB;IAChC,4BAA4B;IAC5B,OAAO,EAAE,MAAM,CAAC;IAChB,kCAAkC;IAClC,SAAS,EAAE,OAAO,CAAC;IACnB,sEAAsE;IACtE,WAAW,EAAE,OAAO,GAAG,OAAO,GAAG,IAAI,CAAC;IACtC,oDAAoD;IACpD,UAAU,EAAE,MAAM,CAAC;IACnB,oDAAoD;IACpD,UAAU,EAAE,MAAM,CAAC;IACnB,uDAAuD;IACvD,WAAW,EAAE,MAAM,CAAC;IACpB,8CAA8C;IAC9C,WAAW,EAAE,MAAM,CAAC;IACpB,yFAAyF;IACzF,eAAe,EAAE,OAAO,CAAC;IACzB,2EAA2E;IAC3E,qBAAqB,EAAE,OAAO,CAAC;IAC/B,2CAA2C;IAC3C,QAAQ,EAAE,MAAM,CAAC;IACjB,2CAA2C;IAC3C,QAAQ,EAAE,MAAM,CAAC;CACjB;AAED,MAAM,WAAW,iBAAiB;IACjC,8CAA8C;IAC9C,QAAQ,CAAC,EAAE,MAAM,CAAC;IAClB,8CAA8C;IAC9C,QAAQ,CAAC,EAAE,MAAM,CAAC;CAClB;AA4DD;;GAEG;AACH,wBAAgB,UAAU,CAAC,KAAK,EAAE,MAAM,GAAG,MAAM,CAQhD;AAED;;;;;;GAMG;AACH,wBAAgB,YAAY,CAAC,OAAO,EAAE,MAAM,EAAE,OAAO,GAAE,iBAAsB,GAAG,gBAAgB,CAkF/F;AAED;;;;;GAKG;AACH,wBAAgB,YAAY,CAAC,OAAO,EAAE,MAAM,EAAE,OAAO,GAAE,iBAAsB,GAAG,gBAAgB,CA0E/F;AA2CD;;;GAGG;AACH,wBAAgB,YAAY,CAC3B,IAAI,EAAE,MAAM,EACZ,QAAQ,GAAE,MAA6B,GACrC;IAAE,IAAI,EAAE,MAAM,CAAC;IAAC,YAAY,EAAE,OAAO,CAAA;CAAE,CAKzC","sourcesContent":["/**\n * Shared truncation utilities for tool outputs.\n *\n * Truncation is based on two independent limits - whichever is hit first wins:\n * - Line limit (default: 2000 lines)\n * - Byte limit (default: 50KB)\n *\n * Never returns partial lines (except bash tail truncation edge case).\n */\n\nexport const DEFAULT_MAX_LINES = 2000;\nexport const DEFAULT_MAX_BYTES = 50 * 1024; // 50KB\nexport const GREP_MAX_LINE_LENGTH = 500; // Max chars per grep match line\n\nexport interface TruncationResult {\n\t/** The truncated content */\n\tcontent: string;\n\t/** Whether truncation occurred */\n\ttruncated: boolean;\n\t/** Which limit was hit: \"lines\", \"bytes\", or null if not truncated */\n\ttruncatedBy: \"lines\" | \"bytes\" | null;\n\t/** Total number of lines in the original content */\n\ttotalLines: number;\n\t/** Total number of bytes in the original content */\n\ttotalBytes: number;\n\t/** Number of complete lines in the truncated output */\n\toutputLines: number;\n\t/** Number of bytes in the truncated output */\n\toutputBytes: number;\n\t/** Whether the last line was partially truncated (only for tail truncation edge case) */\n\tlastLinePartial: boolean;\n\t/** Whether the first line exceeded the byte limit (for head truncation) */\n\tfirstLineExceedsLimit: boolean;\n\t/** The max lines limit that was applied */\n\tmaxLines: number;\n\t/** The max bytes limit that was applied */\n\tmaxBytes: number;\n}\n\nexport interface TruncationOptions {\n\t/** Maximum number of lines (default: 2000) */\n\tmaxLines?: number;\n\t/** Maximum number of bytes (default: 50KB) */\n\tmaxBytes?: number;\n}\n\ninterface RuntimeBuffer {\n\tbyteLength(content: string, encoding: \"utf8\"): number;\n}\n\nconst runtimeBuffer = (globalThis as { Buffer?: RuntimeBuffer }).Buffer;\nconst nonAsciiPattern = /[^\\x00-\\x7f]/;\n\nfunction utf8ByteLength(content: string): number {\n\tif (runtimeBuffer) return runtimeBuffer.byteLength(content, \"utf8\");\n\n\tconst firstNonAscii = content.search(nonAsciiPattern);\n\tif (firstNonAscii === -1) return content.length;\n\n\tlet bytes = firstNonAscii;\n\tfor (let i = firstNonAscii; i < content.length; i++) {\n\t\tconst code = content.charCodeAt(i);\n\t\tif (code <= 0x7f) {\n\t\t\tbytes += 1;\n\t\t} else if (code <= 0x7ff) {\n\t\t\tbytes += 2;\n\t\t} else if (code >= 0xd800 && code <= 0xdbff && i + 1 < content.length) {\n\t\t\tconst next = content.charCodeAt(i + 1);\n\t\t\tif (next >= 0xdc00 && next <= 0xdfff) {\n\t\t\t\tbytes += 4;\n\t\t\t\ti++;\n\t\t\t} else {\n\t\t\t\tbytes += 3;\n\t\t\t}\n\t\t} else {\n\t\t\tbytes += 3;\n\t\t}\n\t}\n\treturn bytes;\n}\n\nfunction replaceUnpairedSurrogates(content: string): string {\n\tlet output = \"\";\n\tfor (let i = 0; i < content.length; i++) {\n\t\tconst code = content.charCodeAt(i);\n\t\tif (code >= 0xd800 && code <= 0xdbff) {\n\t\t\tif (i + 1 < content.length) {\n\t\t\t\tconst next = content.charCodeAt(i + 1);\n\t\t\t\tif (next >= 0xdc00 && next <= 0xdfff) {\n\t\t\t\t\toutput += content[i] + content[i + 1];\n\t\t\t\t\ti++;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\t\t\toutput += \"�\";\n\t\t} else if (code >= 0xdc00 && code <= 0xdfff) {\n\t\t\toutput += \"�\";\n\t\t} else {\n\t\t\toutput += content[i];\n\t\t}\n\t}\n\treturn output;\n}\n\n/**\n * Format bytes as human-readable size.\n */\nexport function formatSize(bytes: number): string {\n\tif (bytes < 1024) {\n\t\treturn `${bytes}B`;\n\t} else if (bytes < 1024 * 1024) {\n\t\treturn `${(bytes / 1024).toFixed(1)}KB`;\n\t} else {\n\t\treturn `${(bytes / (1024 * 1024)).toFixed(1)}MB`;\n\t}\n}\n\n/**\n * Truncate content from the head (keep first N lines/bytes).\n * Suitable for file reads where you want to see the beginning.\n *\n * Never returns partial lines. If first line exceeds byte limit,\n * returns empty content with firstLineExceedsLimit=true.\n */\nexport function truncateHead(content: string, options: TruncationOptions = {}): TruncationResult {\n\tconst maxLines = options.maxLines ?? DEFAULT_MAX_LINES;\n\tconst maxBytes = options.maxBytes ?? DEFAULT_MAX_BYTES;\n\n\tconst totalBytes = utf8ByteLength(content);\n\tconst lines = content.split(\"\\n\");\n\tconst totalLines = lines.length;\n\n\t// Check if no truncation needed\n\tif (totalLines <= maxLines && totalBytes <= maxBytes) {\n\t\treturn {\n\t\t\tcontent,\n\t\t\ttruncated: false,\n\t\t\ttruncatedBy: null,\n\t\t\ttotalLines,\n\t\t\ttotalBytes,\n\t\t\toutputLines: totalLines,\n\t\t\toutputBytes: totalBytes,\n\t\t\tlastLinePartial: false,\n\t\t\tfirstLineExceedsLimit: false,\n\t\t\tmaxLines,\n\t\t\tmaxBytes,\n\t\t};\n\t}\n\n\t// Check if first line alone exceeds byte limit\n\tconst firstLineBytes = utf8ByteLength(lines[0]);\n\tif (firstLineBytes > maxBytes) {\n\t\treturn {\n\t\t\tcontent: \"\",\n\t\t\ttruncated: true,\n\t\t\ttruncatedBy: \"bytes\",\n\t\t\ttotalLines,\n\t\t\ttotalBytes,\n\t\t\toutputLines: 0,\n\t\t\toutputBytes: 0,\n\t\t\tlastLinePartial: false,\n\t\t\tfirstLineExceedsLimit: true,\n\t\t\tmaxLines,\n\t\t\tmaxBytes,\n\t\t};\n\t}\n\n\t// Collect complete lines that fit\n\tconst outputLinesArr: string[] = [];\n\tlet outputBytesCount = 0;\n\tlet truncatedBy: \"lines\" | \"bytes\" = \"lines\";\n\n\tfor (let i = 0; i < lines.length && i < maxLines; i++) {\n\t\tconst line = lines[i];\n\t\tconst lineBytes = utf8ByteLength(line) + (i > 0 ? 1 : 0); // +1 for newline\n\n\t\tif (outputBytesCount + lineBytes > maxBytes) {\n\t\t\ttruncatedBy = \"bytes\";\n\t\t\tbreak;\n\t\t}\n\n\t\toutputLinesArr.push(line);\n\t\toutputBytesCount += lineBytes;\n\t}\n\n\t// If we exited due to line limit\n\tif (outputLinesArr.length >= maxLines && outputBytesCount <= maxBytes) {\n\t\ttruncatedBy = \"lines\";\n\t}\n\n\tconst outputContent = outputLinesArr.join(\"\\n\");\n\tconst finalOutputBytes = utf8ByteLength(outputContent);\n\n\treturn {\n\t\tcontent: outputContent,\n\t\ttruncated: true,\n\t\ttruncatedBy,\n\t\ttotalLines,\n\t\ttotalBytes,\n\t\toutputLines: outputLinesArr.length,\n\t\toutputBytes: finalOutputBytes,\n\t\tlastLinePartial: false,\n\t\tfirstLineExceedsLimit: false,\n\t\tmaxLines,\n\t\tmaxBytes,\n\t};\n}\n\n/**\n * Truncate content from the tail (keep last N lines/bytes).\n * Suitable for bash output where you want to see the end (errors, final results).\n *\n * May return partial first line if the last line of original content exceeds byte limit.\n */\nexport function truncateTail(content: string, options: TruncationOptions = {}): TruncationResult {\n\tconst maxLines = options.maxLines ?? DEFAULT_MAX_LINES;\n\tconst maxBytes = options.maxBytes ?? DEFAULT_MAX_BYTES;\n\n\tconst totalBytes = utf8ByteLength(content);\n\tconst lines = content.split(\"\\n\");\n\tif (lines.length > 1 && lines[lines.length - 1] === \"\") lines.pop();\n\tconst totalLines = lines.length;\n\n\t// Check if no truncation needed\n\tif (totalLines <= maxLines && totalBytes <= maxBytes) {\n\t\treturn {\n\t\t\tcontent,\n\t\t\ttruncated: false,\n\t\t\ttruncatedBy: null,\n\t\t\ttotalLines,\n\t\t\ttotalBytes,\n\t\t\toutputLines: totalLines,\n\t\t\toutputBytes: totalBytes,\n\t\t\tlastLinePartial: false,\n\t\t\tfirstLineExceedsLimit: false,\n\t\t\tmaxLines,\n\t\t\tmaxBytes,\n\t\t};\n\t}\n\n\t// Work backwards from the end\n\tconst outputLinesArr: string[] = [];\n\tlet outputBytesCount = 0;\n\tlet truncatedBy: \"lines\" | \"bytes\" = \"lines\";\n\tlet lastLinePartial = false;\n\n\tfor (let i = lines.length - 1; i >= 0 && outputLinesArr.length < maxLines; i--) {\n\t\tconst line = lines[i];\n\t\tconst lineBytes = utf8ByteLength(line) + (outputLinesArr.length > 0 ? 1 : 0); // +1 for newline\n\n\t\tif (outputBytesCount + lineBytes > maxBytes) {\n\t\t\ttruncatedBy = \"bytes\";\n\t\t\t// Edge case: if we haven't added ANY lines yet and this line exceeds maxBytes,\n\t\t\t// take the end of the line (partial)\n\t\t\tif (outputLinesArr.length === 0) {\n\t\t\t\tconst truncatedLine = truncateStringToBytesFromEnd(line, maxBytes);\n\t\t\t\toutputLinesArr.unshift(truncatedLine);\n\t\t\t\toutputBytesCount = utf8ByteLength(truncatedLine);\n\t\t\t\tlastLinePartial = true;\n\t\t\t}\n\t\t\tbreak;\n\t\t}\n\n\t\toutputLinesArr.unshift(line);\n\t\toutputBytesCount += lineBytes;\n\t}\n\n\t// If we exited due to line limit\n\tif (outputLinesArr.length >= maxLines && outputBytesCount <= maxBytes) {\n\t\ttruncatedBy = \"lines\";\n\t}\n\n\tconst outputContent = outputLinesArr.join(\"\\n\");\n\tconst finalOutputBytes = utf8ByteLength(outputContent);\n\n\treturn {\n\t\tcontent: outputContent,\n\t\ttruncated: true,\n\t\ttruncatedBy,\n\t\ttotalLines,\n\t\ttotalBytes,\n\t\toutputLines: outputLinesArr.length,\n\t\toutputBytes: finalOutputBytes,\n\t\tlastLinePartial,\n\t\tfirstLineExceedsLimit: false,\n\t\tmaxLines,\n\t\tmaxBytes,\n\t};\n}\n\n/**\n * Truncate a string to fit within a byte limit (from the end).\n * Handles multi-byte UTF-8 characters correctly.\n */\nfunction truncateStringToBytesFromEnd(str: string, maxBytes: number): string {\n\tif (maxBytes <= 0) return \"\";\n\n\tlet outputBytes = 0;\n\tlet start = str.length;\n\tlet needsReplacement = false;\n\tfor (let i = str.length; i > 0; ) {\n\t\tlet characterStart = i - 1;\n\t\tconst code = str.charCodeAt(characterStart);\n\t\tlet characterBytes: number;\n\t\tlet unpairedSurrogate = false;\n\t\tif (code >= 0xdc00 && code <= 0xdfff && characterStart > 0) {\n\t\t\tconst previous = str.charCodeAt(characterStart - 1);\n\t\t\tif (previous >= 0xd800 && previous <= 0xdbff) {\n\t\t\t\tcharacterStart--;\n\t\t\t\tcharacterBytes = 4;\n\t\t\t} else {\n\t\t\t\tcharacterBytes = 3;\n\t\t\t\tunpairedSurrogate = true;\n\t\t\t}\n\t\t} else if (code >= 0xd800 && code <= 0xdfff) {\n\t\t\tcharacterBytes = 3;\n\t\t\tunpairedSurrogate = true;\n\t\t} else {\n\t\t\tcharacterBytes = code <= 0x7f ? 1 : code <= 0x7ff ? 2 : 3;\n\t\t}\n\t\tif (outputBytes + characterBytes > maxBytes) break;\n\t\toutputBytes += characterBytes;\n\t\tstart = characterStart;\n\t\tneedsReplacement ||= unpairedSurrogate;\n\t\ti = characterStart;\n\t}\n\n\tconst output = str.slice(start);\n\treturn needsReplacement ? replaceUnpairedSurrogates(output) : output;\n}\n\n/**\n * Truncate a single line to max characters, adding [truncated] suffix.\n * Used for grep match lines.\n */\nexport function truncateLine(\n\tline: string,\n\tmaxChars: number = GREP_MAX_LINE_LENGTH,\n): { text: string; wasTruncated: boolean } {\n\tif (line.length <= maxChars) {\n\t\treturn { text: line, wasTruncated: false };\n\t}\n\treturn { text: `${line.slice(0, maxChars)}... [truncated]`, wasTruncated: true };\n}\n"]}