gram: luck

> ./sample-data/math-pack.formula.highlighter

Lenses
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{
  "id": "math-pack.formula",
  "name": "formula",
  "properties": [
    {
      "name": "$",
      "formula": "=SplitLines()",
      "visibility": "HIDDEN"
    },
    {
      "name": "numbers",
      "formula": "Filter(FindAll(\"number\"), SameLine($))",
      "visibility": "HIDDEN"
    },
    {
      "name": "operators",
      "formula": "Filter(FindAll(\"operator\"), SameLine($))",
      "visibility": "HIDDEN"
    },
    {
      "name": "formula",
      "formula": "numbers.concat(operators)\n  .sortBy(h => h.span[0])\n  .map(h => h.text())\n  .join(\" \")",
      "visibility": "HIDDEN"
    },
    {
      "name": "result",
      "formula": "eval(formula)",
      "visibility": "HIDDEN"
    },
    {
      "name": "showResult",
      "formula": "operators.length >= 1 && numbers.length >= 2 &&\nresult !== undefined",
      "visibility": "HIDDEN"
    },
    {
      "name": "sticker",
      "formula": "showResult ? `= ${result}` : \"\"",
      "visibility": "INLINE"
    }
  ]
}