Fishing Minigame

Fishing Minigame

Designed by	Corbin
Appeared in	2025
Computational class	Polynomial
Reference implementation	[1]

Fishing Minigame is a declarative language for describing idle games. It is an S-expression language which describes two sorts of objects: resources which evolve over time and actions which allow the user to interact with resources. It was originally introduced by Corbin for Langjam Gamejam 2025 as an alternative to writing an imperative graphics-oriented language.

Syntax

Fishing Minigame is described by the following Raku grammar:

grammar Sexp {
    token id { <[-a..zA..Z]>+ }
    token s { '"' <-["]>+ '"' }
    token n { <[0..9]>+ ('.' <[0..9]>+)? ('e' <[0..9]>+)? }
    proto rule ratop {*}
          rule ratop:sym<count> { '.count' }
          rule ratop:sym<n> { <n> }
          rule ratop:sym<div> { '(/' <ratop> <ratop> ')' }
    proto rule boolop {*}
          rule boolop:sym<lt> { '(<' <ratop> <ratop> ')' }
    proto rule strop {*}
          rule strop:sym<s> { <s> }
          rule strop:sym<rat> { '(str' <ratop> ')' }
          rule strop:sym<cond> { '(if' <boolop> <strop> <strop> ')' }
    rule view { '(view' <id> <strop> ')' }
    proto rule lineitem {*}
          rule lineitem:sym<costs> { '(costs' <n> <id> ')' }
          rule lineitem:sym<pays> { '(pays' <n> <id> ')' }
          rule lineitem:sym<enhances> { '(enhances' <id> <id> <n> '->' <n> ')' }
          rule lineitem:sym<enables> { '(enables' <id> <id> <id> ')' }
    proto rule rate {*}
          rule rate:sym<eats> { '(eats' <n> <id> '/s' ')' }
          rule rate:sym<growth> { '(growth' <n> '/s' ')' }
          rule rate:sym<converts> { '(converts' <n> <id> '->' <n> <id> '/s' ')' }
    proto rule rmod {*}
          rule rmod:sym<lineitem> { <lineitem> }
          rule rmod:sym<rate> { <rate> }
          rule rmod:sym<view> { <view> }
    proto rule thing {*}
          rule thing:sym<resource> { '(resource' <id> <n> <s> <rmod>* ')' }
          rule thing:sym<action> { '(action' <id> <s> <lineitem>* ')' }
    rule TOP { '(venture' <s> <thing>* ')' }
};