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{ parse as parseYAML, stringify as stringifyYAML } from \"https://deno.land/std/yaml/mod.ts\";\nimport type { Writer, Reader } from \"jsr:@std/io/types\";\n// import * as jsonMod from \"https://deno.land/std@0.224.0/json/mod.ts\";\n// import * as csv from \"npm:csvtojson\";\n// import { readCSV, readCSVRows, writeCSV } from \"jsr:@vslinko/csv\";\n// import { parse as parseCSV, stringify as stringifyCSV } from \"https://deno.land/std/csv/mod.ts\";\nimport csv from \"npm:csvtojson\";\n// import { CSVtoJSON } from \"https://deno.land/x/data_format_converter@v1.2.0/mod.ts\";\nimport { parse as parseTOML, stringify as stringifyTOML } from \"https://deno.land/std/toml/mod.ts\";\n\ntype DataFormat = 'object' | 'json' | 'yaml' | 'csv' | 'toml';\ntype SelectorType = 'property' | 'index' | 'search' | 'dynamic' | 'append' | 'function';\n\ninterface Selector {\n type: SelectorType;\n value: string | number;\n conditions?: Condition[];\n args?: string[];\n}\n\ninterface Condition {\n property: string;\n operator: string;\n value: any;\n}\n\nclass SelectorParser {\n parse(selectorString: string): Selector[] {\n const selectors: Selector[] = [];\n const parts = this.splitSelector(selectorString);\n\n for (const part of parts) {\n if (part.startsWith('.')) {\n selectors.push(this.parseProperty(part));\n } else if (part.startsWith('[') && part.endsWith(']')) {\n selectors.push(this.parseIndex(part));\n } else if (part.startsWith('(') && part.endsWith(')')) {\n selectors.push(this.parseDynamic(part));\n } else if (part === '[]') {\n selectors.push(this.parseAppend());\n } else if (part.includes('(')) {\n selectors.push(this.parseFunction(part));\n } else {\n // Handle top-level properties without a leading dot\n selectors.push(this.parseProperty(`.${part}`));\n }\n }\n\n return selectors;\n }\n\n private splitSelector(selector: string): string[] {\n const parts: string[] = [];\n let current = '';\n let depth = 0;\n let inQuotes = false;\n\n for (const char of selector) {\n if (char === '\"' && depth === 0) {\n inQuotes = !inQuotes;\n }\n if (!inQuotes) {\n if (char === '(' || char === '[') depth++;\n if (char === ')' || char === ']') depth--;\n }\n if (char === '.' && depth === 0 && !inQuotes && current) {\n parts.push(current);\n current = '';\n } else {\n current += char;\n }\n }\n if (current) parts.push(current);\n\n // If the selector doesn't start with '.', add the first part as is\n if (selector[0] !== '.') {\n return parts;\n }\n\n // Otherwise, add the dot to each part\n return parts.map(part => part.startsWith('.') ? part : `.${part}`);\n }\n\n private parseProperty(part: string): Selector {\n return { type: 'property', value: part.slice(1) };\n }\n\n private parseIndex(part: string): Selector {\n const inner = part.slice(1, -1);\n if (inner === '*') {\n return { type: 'index', value: 'all' };\n }\n const index = parseInt(inner, 10);\n if (isNaN(index)) {\n throw new Error(`Invalid index: ${inner}`);\n }\n return { type: 'index', value: index };\n }\n\n private parseDynamic(part: string): Selector {\n const inner = part.slice(1, -1);\n const [property, operator, value] = inner.split(/\\s*(=|!=|>|<|>=|<=)\\s*/);\n return {\n type: 'dynamic',\n value: property,\n conditions: [{ property, operator, value: this.parseValue(value) }]\n };\n }\n\n private parseAppend(): Selector {\n return { type: 'append', value: 'append' };\n }\n\n private parseFunction(part: string): Selector {\n const [funcName, argsString] = part.split('(');\n const args = argsString.slice(0, -1).split(',').map(arg => arg.trim());\n return { type: 'function', value: funcName, args };\n }\n\n private parseValue(value: string): any {\n if (value === 'true') return true;\n if (value === 'false') return false;\n if (value === 'null') return null;\n if (!isNaN(Number(value))) return Number(value);\n return value.replace(/^[\"']|[\"']$/g, ''); // Remove quotes if present\n }\n}\n\n\ntype FunctionHandler = (data: any, args: string[]) => any;\n\nconst functions: Record = {\n length: (data) => Array.isArray(data) ? data.length : Object.keys(data).length,\n keys: (data) => Object.keys(data),\n values: (data) => Object.values(data),\n sum: (data) => data.reduce((a: number, b: number) => a + b, 0),\n avg: (data) => data.reduce((a: number, b: number) => a + b, 0) / data.length,\n min: (data) => Math.min(...data),\n max: (data) => Math.max(...data),\n join: (data, args) => data.join(args[0] || ','),\n split: (data, args) => data.split(args[0] || ','),\n toUpper: (data) => typeof data === 'string' ? data.toUpperCase() : data,\n toLower: (data) => typeof data === 'string' ? data.toLowerCase() : data,\n};\n\n\nfunction applyFunction(funcName: string, data: any, args: string[] = []): any {\n const func = functions[funcName];\n if (!func) {\n throw new Error(`Unknown function: ${funcName}`);\n }\n\n if (Array.isArray(data)) {\n return data.map(item => func(item, args));\n }\n\n return func(data, args);\n}\n\n\nclass Diesel {\n private data: any;\n private format: DataFormat;\n private selectorParser: SelectorParser;\n private dataReady: Promise;\n constructor(data: string | object, format: DataFormat) {\n this.format = format;\n this.selectorParser = new SelectorParser();\n\n if (typeof data === 'object' || format === 'object') {\n this.data = data;\n this.dataReady = Promise.resolve();\n } else {\n this.dataReady = this.parseData(data, format).then(parsedData => {\n this.data = parsedData;\n }).catch(err => {\n console.error(\"Error parsing data:\", err);\n });\n }\n }\n\n private async parseData(data: string, format: DataFormat): Promise {\n if (data === undefined) {\n throw new Error(\"No data to convert\");\n }\n\n switch (format) {\n case 'json':\n return JSON.parse(data);\n case 'yaml':\n return parseYAML(data);\n case 'csv':\n return await csv().fromString(data)\n case 'toml':\n return parseTOML(data);\n default:\n throw new Error(`Unsupported format: ${format}`);\n }\n }\n\n private async stringifyData(data: any, format: DataFormat): Promise {\n // Function to remove undefined values\n const removeUndefined = (obj: any): any => {\n if (Array.isArray(obj)) {\n return obj.map(removeUndefined).filter(v => v !== undefined);\n } else if (typeof obj === 'object' && obj !== null) {\n return Object.fromEntries(\n Object.entries(obj)\n .map(([k, v]) => [k, removeUndefined(v)])\n .filter(([_, v]) => v !== undefined)\n );\n }\n return obj;\n };\n\n // Remove undefined values from the data\n const cleanData = removeUndefined(data);\n\n switch (format) {\n case 'json':\n return JSON.stringify(cleanData);\n case 'yaml':\n return stringifyYAML(cleanData);\n case 'csv':\n const writer = new StringWriter();\n await writeCSV(writer, cleanData);\n return writer.toString();\n case 'toml':\n return stringifyTOML(cleanData);\n default:\n throw new Error(`Unsupported format: ${format}`);\n }\n }\n\n async select(selectorString: string): Promise {\n await this.dataReady; // Ensure data is ready\n if (!selectorString || selectorString === '') {\n return this.data;\n }\n const selectors = this.selectorParser.parse(selectorString);\n return this.traverseSelectors(this.data, selectors);\n }\n\n put(selectorString: string, value: any): void {\n const selectors = this.selectorParser.parse(selectorString);\n this.data = this.traverseSelectorsForPut(this.data, selectors, value);\n }\n\n delete(selectorString: string): void {\n const selectors = this.selectorParser.parse(selectorString);\n this.data = this.traverseSelectorsForDelete(this.data, selectors);\n }\n\n private traverseSelectors(data: any, selectors: Selector[]): any {\n let current = data;\n\n for (const selector of selectors) {\n if (current === undefined || current === null) return undefined;\n\n switch (selector.type) {\n case 'property':\n current = current[selector.value as string];\n break;\n\n case 'index':\n if (Array.isArray(current)) {\n if (selector.value === 'all') {\n return current.map(item => this.traverseSelectors(item, selectors.slice(1)));\n }\n current = current[selector.value as number];\n }\n break;\n\n\n case 'function':\n // If the function is 'length' and current is an array, apply it directly\n if (selector.value === 'length' && Array.isArray(current)) {\n return current.length;\n }\n // Otherwise, apply the function normally\n current = applyFunction(selector.value as string, current, selector.args || []);\n break;\n\n case 'dynamic':\n current = this.applyDynamicSelector(current, selector);\n break;\n\n case 'append':\n // Append doesn't make sense in a read context\n return undefined;\n }\n }\n\n return current;\n }\n\n\n\n\n private traverseSelectorsForPut(data: any, selectors: Selector[], value: any): any {\n if (selectors.length === 0) return value;\n\n const [currentSelector, ...remainingSelectors] = selectors;\n let result: any;\n\n switch (currentSelector.type) {\n case 'property':\n result = data && typeof data === 'object' ? { ...data } : {};\n result[currentSelector.value as string] = this.traverseSelectorsForPut(\n result[currentSelector.value as string],\n remainingSelectors,\n value\n );\n break;\n case 'index':\n result = Array.isArray(data) ? [...data] : [];\n if (currentSelector.value === 'all') {\n return result.map(item => this.traverseSelectorsForPut(item, remainingSelectors, value));\n }\n result[currentSelector.value as number] = this.traverseSelectorsForPut(\n result[currentSelector.value as number],\n remainingSelectors,\n value\n );\n break;\n case 'dynamic':\n result = Array.isArray(data) ? [...data] : [];\n for (let i = 0; i < result.length; i++) {\n if (this.matchesDynamicConditions(result[i], currentSelector)) {\n result[i] = this.traverseSelectorsForPut(result[i], remainingSelectors, value);\n }\n }\n break;\n case 'append':\n result = Array.isArray(data) ? [...data] : [];\n result.push(this.traverseSelectorsForPut({}, remainingSelectors, value));\n break;\n case 'function':\n throw new Error('Cannot put to a function selector');\n }\n\n return result;\n }\n\n private traverseSelectorsForDelete(data: any, selectors: Selector[]): any {\n if (selectors.length === 0 || data === undefined || data === null) return undefined;\n\n const [currentSelector, ...remainingSelectors] = selectors;\n let result: any;\n\n switch (currentSelector.type) {\n case 'property':\n if (typeof data !== 'object' || data === null) return data;\n result = { ...data };\n if (remainingSelectors.length === 0) {\n delete result[currentSelector.value as string];\n } else {\n result[currentSelector.value as string] = this.traverseSelectorsForDelete(\n data[currentSelector.value as string],\n remainingSelectors\n );\n }\n break;\n case 'index':\n if (!Array.isArray(data)) return data;\n result = [...data];\n if (currentSelector.value === 'all') {\n return result.map(item => this.traverseSelectorsForDelete(item, remainingSelectors));\n }\n if (remainingSelectors.length === 0) {\n result.splice(currentSelector.value as number, 1);\n } else {\n result[currentSelector.value as number] = this.traverseSelectorsForDelete(\n data[currentSelector.value as number],\n remainingSelectors\n );\n }\n break;\n case 'dynamic':\n if (!Array.isArray(data)) return data;\n result = data.filter((item: any) => !this.matchesDynamicConditions(item, currentSelector));\n break;\n case 'append':\n return data;\n case 'function':\n throw new Error('Cannot delete from a function selector');\n }\n\n return result;\n }\n\n private applyDynamicSelector(data: any, selector: Selector): any {\n if (!Array.isArray(data)) {\n return undefined;\n }\n return data.filter(item => this.matchesDynamicConditions(item, selector));\n }\n\n private matchesDynamicConditions(item: any, selector: Selector): boolean {\n return selector.conditions?.every(condition => {\n const itemValue = item[condition.property];\n switch (condition.operator) {\n case '=':\n return itemValue === condition.value;\n case '!=':\n return itemValue !== condition.value;\n case '>':\n return itemValue > condition.value;\n case '<':\n return itemValue < condition.value;\n case '>=':\n return itemValue >= condition.value;\n case '<=':\n return itemValue <= condition.value;\n default:\n throw new Error(`Unknown operator: ${condition.operator}`);\n }\n }) ?? false;\n }\n\n async convert(targetFormat: DataFormat): Promise {\n if (this.data === undefined) {\n return \"undefined\";\n }\n return this.stringifyData(this.data, targetFormat);\n }\n\n async toString(): Promise {\n return this.stringifyData(this.data, this.format);\n }\n}\n\n// Helper classes for CSV parsing/stringifying\nclass StringReader implements Reader {\n private data: string;\n private position: number = 0;\n\n constructor(data: string) {\n this.data = data;\n }\n\n read(p: Uint8Array): Promise {\n if (this.position >= this.data.length) {\n return Promise.resolve(null);\n }\n const n = Math.min(p.length, this.data.length - this.position);\n for (let i = 0; i < n; i++) {\n p[i] = this.data.charCodeAt(this.position + i);\n }\n this.position += n;\n return Promise.resolve(n);\n }\n}\n\nclass StringWriter implements Writer {\n private data: string = '';\n\n write(p: Uint8Array): Promise {\n this.data += new TextDecoder().decode(p);\n return Promise.resolve(p.length);\n }\n\n toString(): string {\n return this.data;\n }\n}\n\nexport default Diesel;","deleted","label",[98],"permalink","https://www.val.town/x/maxm/diesel/code/main.tsx","extension","actionData","errors"]