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# example program: reading events from keyboard or mouse
#
# Keeps printing 'a' until you press a key or click on the mouse.

recipe main [
  open-console
  {
    _, found?:boolean <- check-for-interaction
    break-if found?
    print-character-to-display 97, 7/white
    loop
  }
  close-console
]
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-12 20:46:16 +0000
.kc { color: #008800; font-weight: bold } /* Keyword.Constant */ .highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */ .highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */ .highlight .kp { color: #008800 } /* Keyword.Pseudo */ .highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */ .highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */ .highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */ .highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */ .highlight .na { color: #336699 } /* Name.Attribute */ .highlight .nb { color: #003388 } /* Name.Builtin */ .highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */ .highlight .no { color: #003366; font-weight: bold } /* Name.Constant */ .highlight .nd { color: #555555 } /* Name.Decorator */ .highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */ .highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */ .highlight .nl { color: #336699; font-style: italic } /* Name.Label */ .highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #336699; font-weight: bold } /* Name.Property */ .highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #336699 } /* Name.Variable */ .highlight .ow { color: #008800 } /* Operator.Word */ .highlight .w { color: #bbbbbb } /* Text.Whitespace */ .highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
# A list links up multiple objects together to make them easier to manage.
#
# The objects must be of the same type. If you want to store multiple types in
# a single list, use an exclusive-container.

container list:_elem [
  value:_elem
  next:&:list:_elem
]

def push x:_elem, l:&:list:_elem -> l:&:list:_elem [
  local-scope
  load-ingredients
  result:&:list:_elem <- new {(list _elem): type}
  *result <- merge x, l
  return result
]

def first in:&:list:_elem -> result:_elem [
  local-scope
  load-ingredients
  result <- get *in, value:offset
]

def rest in:&:list:_elem -> result:&:list:_elem/contained-in:in [
  local-scope
  load-ingredients
  result <- get *in, next:offset
]

scenario list-handling [
  run [
    local-scope
    x:&:list:num <- push 3, 0
    x <- push 4, x
    x <- push 5, x
    10:num/raw <- first x
    x <- rest x
    11:num/raw <- first x
    x <- rest x
    12:num/raw <- first x
    20:&:list:num/raw <- rest x
  ]
  memory-should-contain [
    10 <- 5
    11 <- 4
    12 <- 3
    20 <- 0  # nothing left
  ]
]

def length l:&:list:_elem -> result:num [
  local-scope
  load-ingredients
  result <- copy 0
  {
    break-unless l
    result <- add result, 1
    l <- rest l
    loop
  }
]

# insert 'x' after 'in'
def insert x:_elem, in:&:list:_elem -> in:&:list:_elem [
  local-scope
  load-ingredients
  new-node:&:list:_elem <- new {(list _elem): type}
  *new-node <- put *new-node, value:offset, x
  next-node:&:list:_elem <- get *in, next:offset
  *in <- put *in, next:offset, new-node
  *new-node <- put *new-node, next:offset, next-node
]

scenario inserting-into-list [
  local-scope
  list:&:list:char <- push 3, 0
  list <- push 4, list
  list <- push 5, list
  run [
    list2:&:list:char <- rest list  # inside list
    list2 <- insert 6, list2
    # check structure
    list2 <- copy list
    10:char/raw <- first list2
    list2 <- rest list2
    11:char/raw <- first list2
    list2 <- rest list2
    12:char/raw <- first list2
    list2 <- rest list2
    13:char/raw <- first list2
  ]
  memory-should-contain [
    10 <- 5  # scanning next
    11 <- 4
    12 <- 6  # inserted element
    13 <- 3
  ]
]

scenario inserting-at-end-of-list [
  local-scope
  list:&:list:char <- push 3, 0
  list <- push 4, list
  list <- push 5, list
  run [
    list2:&:list:char <- rest list  # inside list
    list2 <- rest list2  # now at end of list
    list2 <- insert 6, list2
    # check structure like before
    list2 <- copy list
    10:char/raw <- first list2
    list2 <- rest list2
    11:char/raw <- first list2
    list2 <- rest list2
    12:char/raw <- first list2
    list2 <- rest list2
    13:char/raw <- first list2
  ]
  memory-should-contain [
    10 <- 5  # scanning next
    11 <- 4
    12 <- 3
    13 <- 6  # inserted element
  ]
]

scenario inserting-after-start-of-list [
  local-scope
  list:&:list:char <- push 3, 0
  list <- push 4, list
  list <- push 5, list
  run [
    list <- insert 6, list
    # check structure like before
    list2:&:list:char <- copy list
    10:char/raw <- first list2
    list2 <- rest list2
    11:char/raw <- first list2
    list2 <- rest list2
    12:char/raw <- first list2
    list2 <- rest list2
    13:char/raw <- first list2
  ]
  memory-should-contain [
    10 <- 5  # scanning next
    11 <- 6  # inserted element
    12 <- 4
    13 <- 3
  ]
]

# remove 'x' from its surrounding list 'in'
#
# Returns null if and only if list is empty. Beware: in that case any other
# pointers to the head are now invalid.
def remove x:&:list:_elem/contained-in:in, in:&:list:_elem -> in:&:list:_elem [
  local-scope
  load-ingredients
  # if 'x' is null, return
  return-unless x
  next-node:&:list:_elem <- rest x
  # clear next pointer of 'x'
  *x <- put *x, next:offset, 0
  # if 'x' is at the head of 'in', return the new head
  at-head?:bool <- equal x, in
  return-if at-head?, next-node
  # compute prev-node
  prev-node:&:list:_elem <- copy in
  curr:&:list:_elem <- rest prev-node
  {
    return-unless curr
    found?:bool <- equal curr, x
    break-if found?
    prev-node <- copy curr
    curr <- rest curr
  }
  # set its next pointer to skip 'x'
  *prev-node <- put *prev-node, next:offset, next-node
]

scenario removing-from-list [
  local-scope
  list:&:list:char <- push 3, 0
  list <- push 4, list
  list <- push 5, list
  run [
    list2:&:list:char <- rest list  # second element
    list <- remove list2, list
    10:bool/raw <- equal list2, 0
    # check structure like before
    list2 <- copy list
    11:char/raw <- first list2
    list2 <- rest list2
    12:char/raw <- first list2
    20:&:list:char/raw <- rest list2
  ]
  memory-should-contain [
    10 <- 0  # remove returned non-null
    11 <- 5  # scanning next, skipping deleted element
    12 <- 3
    20 <- 0  # no more elements
  ]
]

scenario removing-from-start-of-list [
  local-scope
  list:&:list:char <- push 3, 0
  list <- push 4, list
  list <- push 5, list
  run [
    list <- remove list, list
    # check structure like before
    list2:&:list:char <- copy list
    10:char/raw <- first list2
    list2 <- rest list2
    11:char/raw <- first list2
    20:&:list:char/raw <- rest list2
  ]
  memory-should-contain [
    10 <- 4  # scanning next, skipping deleted element
    11 <- 3
    20 <- 0  # no more elements
  ]
]

scenario removing-from-end-of-list [
  local-scope
  list:&:list:char <- push 3, 0
  list <- push 4, list
  list <- push 5, list
  run [
    # delete last element
    list2:&:list:char <- rest list
    list2 <- rest list2
    list <- remove list2, list
    10:bool/raw <- equal list2, 0
    # check structure like before
    list2 <- copy list
    11:char/raw <- first list2
    list2 <- rest list2
    12:char/raw <- first list2
    20:&:list:char/raw <- rest list2
  ]
  memory-should-contain [
    10 <- 0  # remove returned non-null
    11 <- 5  # scanning next, skipping deleted element
    12 <- 4
    20 <- 0  # no more elements
  ]
]

scenario removing-from-singleton-list [
  local-scope
  list:&:list:char <- push 3, 0
  run [
    list <- remove list, list
    1:num/raw <- copy list
  ]
  memory-should-contain [
    1 <- 0  # back to an empty list
  ]
]

# reverse the elements of a list
# (contributed by Caleb Couch)
def reverse list:&:list:_elem temp:&:list:_elem/contained-in:result -> result:&:list:_elem [
  local-scope
  load-ingredients
  return-unless list, temp
  object:_elem <- first, list
  list <- rest list
  temp <- push object, temp
  result <- reverse list, temp
]

scenario reverse-list [
  local-scope
  list:&:list:number <- push 1, 0
  list <- push 2, list
  list <- push 3, list
  run [
    stash [list:], list
    list <- reverse list
    stash [reversed:], list
  ]
  trace-should-contain [
    app: list: 3 -> 2 -> 1
    app: reversed: 1 -> 2 -> 3
  ]
]

def to-text in:&:list:_elem -> result:text [
  local-scope
  load-ingredients
  buf:&:buffer:char <- new-buffer 80
  buf <- to-buffer in, buf
  result <- buffer-to-array buf
]

# variant of 'to-text' which stops printing after a few elements (and so is robust to cycles)
def to-text-line in:&:list:_elem -> result:text [
  local-scope
  load-ingredients
  buf:&:buffer:char <- new-buffer 80
  buf <- to-buffer in, buf, 6  # max elements to display
  result <- buffer-to-array buf
]

def to-buffer in:&:list:_elem, buf:&:buffer:char -> buf:&:buffer:char [
  local-scope
  load-ingredients
  {
    break-if in
    buf <- append buf, [[]]
    return
  }
  # append in.value to buf
  val:_elem <- get *in, value:offset
  buf <- append buf, val
  # now prepare next
  next:&:list:_elem <- rest in
  nextn:num <- copy next
  return-unless next
  buf <- append buf, [ -> ]
  # and recurse
  remaining:num, optional-ingredient-found?:bool <- next-ingredient
  {
    break-if optional-ingredient-found?
    # unlimited recursion
    buf <- to-buffer next, buf
    return
  }
  {
    break-unless remaining
    # limited recursion
    remaining <- subtract remaining, 1
    buf <- to-buffer next, buf, remaining
    return
  }
  # past recursion depth; insert ellipses and stop
  append buf, [...]
]

scenario stash-empty-list [
  local-scope
  x:&:list:num <- copy 0
  run [
    stash x
  ]
  trace-should-contain [
    app: []
  ]
]
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-12 20:46:15 +0000