[csv2lambda]

csv2lambda is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Transforms CSV into a lambda hierarchy.

• Value (csv), required: CSV text to transform
• Returns: Resolves to the parsed lambda hierarchy as child nodes; each child is one CSV row containing column-named values

Arguments

Required arguments come first, then the optional ones in the order they are declared.

Argument	Type	Required	Description
[types]	lambda	no	Column type conversions keyed by column name.
[types] / any node name	string	yes	Type name for the column. Can be repeated.
[null-value]	string	no	String used to represent null values. Default: [NULL].

Returned nodes

Node	Type	Required	Description
unnamed child node	lambda	no	One CSV record returned as a child node; column values appear as named children keyed by the header column name. Can be repeated.
unnamed child node / any node name	string	no	CSV column value; child name is the header column name. Can be repeated.

Guide: How to use [csv2lambda]

JSON declaration

This is the complete declaration of csv2lambda, as the running system describes it. It is also published as slot.json.

JSON declaration

{
  "name": "csv2lambda",
  "description": "Transforms CSV into a lambda hierarchy",
  "signature": {
    "input": {
      "kind": "csv",
      "description": "CSV text to transform",
      "required": true,
      "mode": "ValueOrExpression"
    },
    "children": {
      "types": {
        "type": "lambda",
        "kind": "csv-column-types",
        "description": "Column type conversions keyed by column name",
        "required": false,
        "mode": "ValueOrExpression",
        "cardinality": "ZeroOrOne",
        "role": "DynamicMap",
        "projection": "StructuredTree",
        "children": {
          "*": {
            "type": "string",
            "kind": "csv-column-type",
            "description": "Type name for the column",
            "required": true,
            "mode": "ValueOrExpression",
            "cardinality": "OneOrMore",
            "role": "DynamicMap",
            "projection": "Value"
          }
        }
      },
      "null-value": {
        "type": "string",
        "kind": "null-value",
        "description": "String used to represent null values",
        "required": false,
        "mode": "ValueOrExpression",
        "cardinality": "ZeroOrOne",
        "default": "[NULL]",
        "role": "Option",
        "projection": "Value"
      }
    },
    "output": {
      "mode": "Lambda",
      "kind": "node-list",
      "element-kind": "csv-row,lambda-tree",
      "description": "Resolves to the parsed lambda hierarchy as child nodes; each child is one CSV row containing column-named values",
      "children": [
        {
          "type": "lambda",
          "kind": "row",
          "description": "One CSV record returned as a child node; column values appear as named children keyed by the header column name",
          "required": false,
          "mode": "Value",
          "cardinality": "ZeroOrMore",
          "role": "StructuredObject",
          "projection": "StructuredTree",
          "children": {
            "*": {
              "type": "string",
              "kind": "column-value",
              "description": "CSV column value; child name is the header column name",
              "required": false,
              "mode": "Value",
              "cardinality": "ZeroOrMore",
              "role": "Option",
              "projection": "Value"
            }
          }
        }
      ]
    }
  }
}

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