lemma-engine 0.9.1

A pure, declarative language for business rules.
Documentation 
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{
  "type": "rule",
  "name": "total",
  "result": "125.00 eur",
  "body": "subtotal + fee",
  "causes": [{ "condition": "is_member is true", "value": "true" }],
  "children": [
    { "type": "data", "name": "subtotal", "display": "100.00 eur" },
    { "type": "data_unused", "name": "discount" },
    {
      "type": "conversion",
      "expression": "fee_usd + subtotal",
      "steps": [
        { "role": "source", "text": "27.00 usd" },
        { "role": "rule", "text": "1 usd is 0.91 eur" },
        { "role": "outcome", "text": "24.57 eur" }
      ],
      "operands": [{ "type": "data", "name": "fee_usd", "display": "27.00 usd" }]
    },
    {
      "type": "compose",
      "expression": "surcharge * multiplier",
      "operands": [{ "type": "veto", "message": "surcharge unavailable" }]
    }
  ]
}