mlld/dist/chunk-3BKXIDNI.mjs.map

mlld: a modular prompt scripting language

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* Variable Proxy System for Shadow Environments\n * Part of Phase 4: System-wide Variable Flow\n * \n * Creates proxy objects that allow shadow environment code to:\n * 1. Use Variables normally (transparent value access)\n * 2. Introspect type information via special properties\n * 3. Access metadata for advanced use cases\n */\n\nimport type { Variable } from '@core/types/variable/VariableTypes';\nimport { isVariable } from '@interpreter/utils/variable-resolution';\n\n/**\n * Special property names for Variable introspection\n */\nexport const VARIABLE_PROXY_PROPS = {\n  TYPE: '__mlld_type',\n  SUBTYPE: '__mlld_subtype',\n  METADATA: '__mlld_metadata',\n  VARIABLE: '__mlld_variable',\n  IS_VARIABLE: '__mlld_is_variable'\n} as const;\n\n/**\n * Create a proxy for a Variable that allows transparent value access\n * while exposing type information through special properties\n */\nexport function createVariableProxy(variable: Variable): any {\n  const value = variable.value;\n  \n  // Can't proxy primitives (string, number, boolean, null)\n  if (value === null || typeof value !== 'object') {\n    // For primitives, we'll need a different strategy\n    // Could wrap in an object but that changes behavior\n    return value;\n  }\n  \n  // Create proxy for objects and arrays\n  return new Proxy(value, {\n    get(target, prop, receiver) {\n      // Handle special Variable introspection properties\n      switch (prop) {\n        case VARIABLE_PROXY_PROPS.TYPE:\n          return variable.type;\n          \n        case VARIABLE_PROXY_PROPS.SUBTYPE:\n          return variable.subtype;\n          \n        case VARIABLE_PROXY_PROPS.METADATA:\n          return variable.metadata || {};\n          \n        case VARIABLE_PROXY_PROPS.VARIABLE:\n          return variable;\n          \n        case VARIABLE_PROXY_PROPS.IS_VARIABLE:\n          return true;\n          \n        // Special handling for toString to preserve custom behavior\n        case 'toString':\n          if (variable.metadata?.customToString) {\n            // Bind the custom toString to the target\n            return variable.metadata.customToString.bind(target);\n          }\n          return Reflect.get(target, prop, receiver);\n          \n        // Special handling for toJSON\n        case 'toJSON':\n          if (variable.metadata?.customToJSON) {\n            return variable.metadata.customToJSON;\n          }\n          return Reflect.get(target, prop, receiver);\n          \n        default:\n          // Normal property access\n          return Reflect.get(target, prop, receiver);\n      }\n    },\n    \n    // Preserve normal array/object behavior for other operations\n    set(target, prop, value, receiver) {\n      return Reflect.set(target, prop, value, receiver);\n    },\n    \n    has(target, prop) {\n      // Report that we have the special properties\n      if (Object.values(VARIABLE_PROXY_PROPS).includes(prop as any)) {\n        return true;\n      }\n      return Reflect.has(target, prop);\n    },\n    \n    ownKeys(target) {\n      // Don't include special properties in enumeration\n      // This keeps JSON.stringify and for...in loops clean\n      return Reflect.ownKeys(target);\n    },\n    \n    getOwnPropertyDescriptor(target, prop) {\n      // Special properties are non-enumerable\n      if (Object.values(VARIABLE_PROXY_PROPS).includes(prop as any)) {\n        return {\n          configurable: true,\n          enumerable: false,\n          get: () => this.get!(target, prop, target)\n        };\n      }\n      return Reflect.getOwnPropertyDescriptor(target, prop);\n    }\n  });\n}\n\n/**\n * Prepare a value for passing to shadow environment\n * Variables become proxies, non-Variables pass through\n */\nexport function prepareValueForShadow(value: any): any {\n  if (isVariable(value)) {\n    return createVariableProxy(value);\n  }\n  return value;\n}\n\n/**\n * Prepare parameters object for shadow environment\n * Converts all Variable values to proxies\n */\nexport function prepareParamsForShadow(params: Record<string, any>): Record<string, any> {\n  const shadowParams: Record<string, any> = {};\n  \n  for (const [key, value] of Object.entries(params)) {\n    shadowParams[key] = prepareValueForShadow(value);\n  }\n  \n  return shadowParams;\n}\n\n/**\n * Helper function for shadow environments to check if a value is a Variable proxy\n */\nexport function isVariableProxy(value: any): boolean {\n  if (value === null || typeof value !== 'object') {\n    return false;\n  }\n  \n  try {\n    // Try to access the special property\n    return value[VARIABLE_PROXY_PROPS.IS_VARIABLE] === true;\n  } catch {\n    return false;\n  }\n}\n\n/**\n * Helper function to get Variable type from a proxy\n */\nexport function getVariableType(value: any): string | undefined {\n  if (!isVariableProxy(value)) {\n    return undefined;\n  }\n  \n  try {\n    return value[VARIABLE_PROXY_PROPS.TYPE];\n  } catch {\n    return undefined;\n  }\n}\n\n/**\n * Create mlld helper object for shadow environments\n * @param primitiveMetadata - Optional metadata for primitive values that can't be proxied\n */\nexport function createMlldHelpers(primitiveMetadata?: Record<string, any>) {\n  return {\n    // Type checking - also check primitive metadata\n    isVariable: (value: any, name?: string) => {\n      // First check if it's a proxy\n      if (isVariableProxy(value)) {\n        return true;\n      }\n      // Then check if we have metadata for this primitive\n      if (name && primitiveMetadata && primitiveMetadata[name]) {\n        return primitiveMetadata[name].isVariable === true;\n      }\n      return false;\n    },\n    \n    getType: (value: any, name?: string) => {\n      // First check if it's a proxy\n      const proxyType = getVariableType(value);\n      if (proxyType !== undefined) {\n        return proxyType;\n      }\n      // Then check primitive metadata\n      if (name && primitiveMetadata && primitiveMetadata[name]) {\n        return primitiveMetadata[name].type;\n      }\n      return undefined;\n    },\n    \n    // Property names for direct access\n    TYPE: VARIABLE_PROXY_PROPS.TYPE,\n    SUBTYPE: VARIABLE_PROXY_PROPS.SUBTYPE,\n    METADATA: VARIABLE_PROXY_PROPS.METADATA,\n    VARIABLE: VARIABLE_PROXY_PROPS.VARIABLE,\n    \n    // Metadata helpers - 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