Category talk:Wren-seq: Difference between revisions
→Source code: Added methods to create 2d and 3d lists and to create lists of mutable types.
(→Source code: Numerous changes to View class.) |
(→Source code: Added methods to create 2d and 3d lists and to create lists of mutable types.) |
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/* Lst supplements the List class with various other operations on lists. */
class Lst {
// Creates a list with 'cols' columns and assigns a copy of 'filler' to each element.
// 'copier' is a function which takes a single argument and returns a copy of that argument.
static filled(cols, filler, copier) {
if (cols.type != Num || !cols.isInteger || cols < 0) {
Fiber.abort("'cols' must be a non-negative integer.")
}
var lst
if (!copier) {
lst = List.filled(cols, filler)
} else {
lst = List.filled(cols, null)
for (c in 0...cols) lst[c] = copier.call(filler)
}
return lst
}
// Creates a two dimensional list with 'rows' rows and 'cols' columns and assigns a copy
// of 'filler' to each element.
// 'copier' is a function which takes a single argument and returns a copy of that argument.
static filled2(rows, cols, filler, copier) {
if (rows.type != Num || !rows.isInteger || rows < 0) {
Fiber.abort("'rows' must be a non-negative integer.")
}
if (cols.type != Num || !cols.isInteger || cols < 0) {
Fiber.abort("'cols' must be a non-negative integer.")
}
var lst = List.filled(rows, null)
for (r in 0...rows) {
if (!copier) {
lst[r] = List.filled(cols, filler)
} else {
lst[r] = List.filled(cols, null)
for (c in 0...cols) lst[r][c] = copier.call(filler)
}
}
return lst
}
// Creates a three dimensional list with 'pages' pages, 'rows' rows and 'cols' columns and assigns
// a copy of 'filler' to each element.
// 'copier' is a function which takes a single argument and returns a copy of that argument.
static filled3(pages, rows, cols, filler, copier) {
if (pages.type != Num || !pages.isInteger || pages < 0) {
Fiber.abort("'pages' must be a non-negative integer.")
}
if (rows.type != Num || !rows.isInteger || rows < 0) {
Fiber.abort("'rows' must be a non-negative integer.")
}
if (cols.type != Num || !cols.isInteger || cols < 0) {
Fiber.abort("'cols' must be a non-negative integer.")
}
var lst = List.filled(pages, null)
for (p in 0...pages) {
lst[p] = List.filled(rows, null)
for (r in 0...rows) {
if (!copier) {
lst[p][r] = List.filled(cols, filler)
} else {
lst[p][r] = List.filled(cols, null)
for (c in 0...cols) lst[p][r][c] = copier.call(filler)
}
}
}
return lst
}
// The following overloads of the above methods should normally only be used where the 'filler'
// is of an immutable type and does not need to be copied.
// No overload is required for 'filled' as List.filled suffices for such types.
static filled2(rows, cols, filler) { filled2(rows, cols, filler, null) }
static filled3(pages, rows, cols, filler) { filled3(pages, rows, cols, filler, null) }
// Private helper method to check that 'a' is a list and throw an error otherwise.
static isList_(a) { (a is List) ? true : Fiber.abort("Argument must be a list.") }
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