Support conditionals

[thomasjohns]

E.g.

transform Test {
    headers {
        'a' -> 'A'
    }
    values {
       ['A'] -> add 1 | mult 2
       ['B'] -> {
           | if ['A'] > 1 {
               ['C']
           } else {
               ['A']
           }
           | if ['a'] == 3 {
               add 1 | mult 2
           }
           | square
       }
       ['C'] -> {
           | trim
           | title
           | replace '  ' ' '
       }
   }
}

Stages

• parse
• interpret