649 lines
17 KiB
V
649 lines
17 KiB
V
// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module builtin
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import strings
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// array is a struct used for denoting array types in V
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pub struct array {
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pub:
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element_size int // size in bytes of one element in the array.
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pub mut:
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data voidptr
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offset int // in bytes (should be `usize`)
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len int // length of the array.
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cap int // capacity of the array.
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}
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// array.data uses a void pointer, which allows implementing arrays without generics and without generating
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// extra code for every type.
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// Internal function, used by V (`nums := []int`)
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fn __new_array(mylen int, cap int, elm_size int) array {
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cap_ := if cap < mylen { mylen } else { cap }
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arr := array{
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element_size: elm_size
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data: vcalloc(cap_ * elm_size)
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len: mylen
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cap: cap_
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}
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return arr
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}
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fn __new_array_with_default(mylen int, cap int, elm_size int, val voidptr) array {
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cap_ := if cap < mylen { mylen } else { cap }
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mut arr := array{
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element_size: elm_size
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len: mylen
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cap: cap_
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}
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if cap_ > 0 && mylen == 0 {
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arr.data = unsafe { malloc(cap_ * elm_size) }
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} else {
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arr.data = vcalloc(cap_ * elm_size)
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}
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if val != 0 {
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for i in 0 .. arr.len {
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unsafe { arr.set_unsafe(i, val) }
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}
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}
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return arr
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}
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fn __new_array_with_array_default(mylen int, cap int, elm_size int, val array) array {
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cap_ := if cap < mylen { mylen } else { cap }
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mut arr := array{
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element_size: elm_size
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data: unsafe { malloc(cap_ * elm_size) }
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len: mylen
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cap: cap_
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}
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for i in 0 .. arr.len {
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val_clone := unsafe { val.clone_to_depth(1) }
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unsafe { arr.set_unsafe(i, &val_clone) }
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}
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return arr
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}
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// Private function, used by V (`nums := [1, 2, 3]`)
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fn new_array_from_c_array(len int, cap int, elm_size int, c_array voidptr) array {
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cap_ := if cap < len { len } else { cap }
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arr := array{
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element_size: elm_size
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data: vcalloc(cap_ * elm_size)
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len: len
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cap: cap_
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}
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// TODO Write all memory functions (like memcpy) in V
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unsafe { vmemcpy(arr.data, c_array, len * elm_size) }
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return arr
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}
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// Private function, used by V (`nums := [1, 2, 3] !`)
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fn new_array_from_c_array_no_alloc(len int, cap int, elm_size int, c_array voidptr) array {
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arr := array{
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element_size: elm_size
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data: c_array
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len: len
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cap: cap
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}
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return arr
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}
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// Private function. Doubles array capacity if needed.
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fn (mut a array) ensure_cap(required int) {
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if required <= a.cap {
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return
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}
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mut cap := if a.cap > 0 { a.cap } else { 2 }
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for required > cap {
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cap *= 2
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}
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new_size := cap * a.element_size
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new_data := vcalloc(new_size)
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if a.data != voidptr(0) {
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unsafe { vmemcpy(new_data, a.data, a.len * a.element_size) }
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// TODO: the old data may be leaked when no GC is used (ref-counting?)
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}
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a.data = new_data
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a.offset = 0
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a.cap = cap
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}
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// repeat returns a new array with the given array elements repeated given times.
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// `cgen` will replace this with an apropriate call to `repeat_to_depth()`
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// This is a dummy placeholder that will be overridden by `cgen` with an appropriate
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// call to `repeat_to_depth()`. However the `checker` needs it here.
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pub fn (a array) repeat(count int) array {
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return unsafe { a.repeat_to_depth(count, 0) }
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}
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// version of `repeat()` that handles multi dimensional arrays
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// `unsafe` to call directly because `depth` is not checked
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[unsafe]
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pub fn (a array) repeat_to_depth(count int, depth int) array {
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if count < 0 {
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panic('array.repeat: count is negative: $count')
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}
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mut size := count * a.len * a.element_size
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if size == 0 {
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size = a.element_size
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}
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arr := array{
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element_size: a.element_size
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data: vcalloc(size)
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len: count * a.len
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cap: count * a.len
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}
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if a.len > 0 {
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for i in 0 .. count {
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if depth > 0 {
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ary_clone := unsafe { a.clone_to_depth(depth) }
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unsafe { vmemcpy(arr.get_unsafe(i * a.len), &byte(ary_clone.data), a.len * a.element_size) }
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} else {
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unsafe { vmemcpy(arr.get_unsafe(i * a.len), &byte(a.data), a.len * a.element_size) }
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}
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}
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}
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return arr
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}
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// sort_with_compare sorts array in-place using given `compare` function as comparator.
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pub fn (mut a array) sort_with_compare(callback fn (voidptr, voidptr) int) {
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$if freestanding {
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panic('sort does not work with -freestanding')
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} $else {
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unsafe { vqsort(a.data, usize(a.len), usize(a.element_size), callback) }
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}
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}
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// insert inserts a value in the array at index `i`
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pub fn (mut a array) insert(i int, val voidptr) {
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$if !no_bounds_checking ? {
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if i < 0 || i > a.len {
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panic('array.insert: index out of range (i == $i, a.len == $a.len)')
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}
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}
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a.ensure_cap(a.len + 1)
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unsafe {
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vmemmove(a.get_unsafe(i + 1), a.get_unsafe(i), (a.len - i) * a.element_size)
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a.set_unsafe(i, val)
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}
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a.len++
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}
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// insert_many inserts many values into the array from index `i`.
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[unsafe]
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pub fn (mut a array) insert_many(i int, val voidptr, size int) {
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$if !no_bounds_checking ? {
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if i < 0 || i > a.len {
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panic('array.insert_many: index out of range (i == $i, a.len == $a.len)')
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}
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}
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a.ensure_cap(a.len + size)
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elem_size := a.element_size
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unsafe {
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iptr := a.get_unsafe(i)
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vmemmove(a.get_unsafe(i + size), iptr, (a.len - i) * elem_size)
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vmemcpy(iptr, val, size * elem_size)
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}
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a.len += size
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}
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// prepend prepends one value to the array.
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pub fn (mut a array) prepend(val voidptr) {
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a.insert(0, val)
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}
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// prepend_many prepends another array to this array.
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[unsafe]
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pub fn (mut a array) prepend_many(val voidptr, size int) {
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unsafe { a.insert_many(0, val, size) }
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}
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// delete deletes array element at index `i`.
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pub fn (mut a array) delete(i int) {
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a.delete_many(i, 1)
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}
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// delete_many deletes `size` elements beginning with index `i`
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pub fn (mut a array) delete_many(i int, size int) {
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$if !no_bounds_checking ? {
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if i < 0 || i + size > a.len {
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endidx := if size > 1 { '..${i + size}' } else { '' }
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panic('array.delete: index out of range (i == $i$endidx, a.len == $a.len)')
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}
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}
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// NB: if a is [12,34], a.len = 2, a.delete(0)
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// should move (2-0-1) elements = 1 element (the 34) forward
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old_data := a.data
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new_size := a.len - size
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new_cap := if new_size == 0 { 1 } else { new_size }
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a.data = vcalloc(new_cap * a.element_size)
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unsafe { vmemcpy(a.data, old_data, i * a.element_size) }
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unsafe {
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vmemcpy(&byte(a.data) + i * a.element_size, &byte(old_data) + (i + size) * a.element_size,
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(a.len - i - size) * a.element_size)
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}
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a.len = new_size
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a.cap = new_cap
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}
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// clear clears the array without deallocating the allocated data.
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pub fn (mut a array) clear() {
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a.len = 0
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}
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// trim trims the array length to "index" without modifying the allocated data. If "index" is greater
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// than len nothing will be changed.
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pub fn (mut a array) trim(index int) {
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if index < a.len {
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a.len = index
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}
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}
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// we manually inline this for single operations for performance without -prod
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[inline; unsafe]
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fn (a array) get_unsafe(i int) voidptr {
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unsafe {
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return &byte(a.data) + i * a.element_size
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}
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}
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// Private function. Used to implement array[] operator.
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fn (a array) get(i int) voidptr {
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$if !no_bounds_checking ? {
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if i < 0 || i >= a.len {
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panic('array.get: index out of range (i == $i, a.len == $a.len)')
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}
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}
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unsafe {
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return &byte(a.data) + i * a.element_size
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}
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}
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// Private function. Used to implement x = a[i] or { ... }
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fn (a array) get_with_check(i int) voidptr {
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if i < 0 || i >= a.len {
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return 0
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}
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unsafe {
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return &byte(a.data) + i * a.element_size
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}
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}
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// first returns the first element of the array.
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pub fn (a array) first() voidptr {
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$if !no_bounds_checking ? {
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if a.len == 0 {
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panic('array.first: array is empty')
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}
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}
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return a.data
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}
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// last returns the last element of the array.
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pub fn (a array) last() voidptr {
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$if !no_bounds_checking ? {
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if a.len == 0 {
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panic('array.last: array is empty')
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}
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}
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unsafe {
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return &byte(a.data) + (a.len - 1) * a.element_size
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}
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}
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// pop returns the last element of the array, and removes it.
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pub fn (mut a array) pop() voidptr {
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// in a sense, this is the opposite of `a << x`
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$if !no_bounds_checking ? {
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if a.len == 0 {
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panic('array.pop: array is empty')
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}
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}
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new_len := a.len - 1
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last_elem := unsafe { &byte(a.data) + new_len * a.element_size }
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a.len = new_len
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// NB: a.cap is not changed here *on purpose*, so that
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// further << ops on that array will be more efficient.
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return unsafe { memdup(last_elem, a.element_size) }
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}
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// delete_last efficiently deletes the last element of the array.
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pub fn (mut a array) delete_last() {
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// copy pasting code for performance
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$if !no_bounds_checking ? {
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if a.len == 0 {
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panic('array.pop: array is empty')
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}
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}
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a.len--
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}
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// slice returns an array using the same buffer as original array
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// but starting from the `start` element and ending with the element before
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// the `end` element of the original array with the length and capacity
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// set to the number of the elements in the slice.
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fn (a array) slice(start int, _end int) array {
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mut end := _end
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$if !no_bounds_checking ? {
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if start > end {
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panic('array.slice: invalid slice index ($start > $end)')
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}
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if end > a.len {
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panic('array.slice: slice bounds out of range ($end >= $a.len)')
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}
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if start < 0 {
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panic('array.slice: slice bounds out of range ($start < 0)')
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}
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}
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offset := start * a.element_size
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data := unsafe { &byte(a.data) + offset }
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l := end - start
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res := array{
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element_size: a.element_size
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data: data
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offset: a.offset + offset
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len: l
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cap: l
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}
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return res
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}
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// used internally for [2..4]
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fn (a array) slice2(start int, _end int, end_max bool) array {
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end := if end_max { a.len } else { _end }
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return a.slice(start, end)
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}
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// `clone_static_to_depth()` returns an independent copy of a given array.
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// Unlike `clone_to_depth()` it has a value receiver and is used internally
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// for slice-clone expressions like `a[2..4].clone()` and in -autofree generated code.
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fn (a array) clone_static_to_depth(depth int) array {
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return unsafe { a.clone_to_depth(depth) }
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}
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// clone returns an independent copy of a given array.
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// this will be overwritten by `cgen` with an apropriate call to `.clone_to_depth()`
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// However the `checker` needs it here.
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pub fn (a &array) clone() array {
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return unsafe { a.clone_to_depth(0) }
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}
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// recursively clone given array - `unsafe` when called directly because depth is not checked
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[unsafe]
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pub fn (a &array) clone_to_depth(depth int) array {
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mut size := a.cap * a.element_size
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if size == 0 {
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size++
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}
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mut arr := array{
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element_size: a.element_size
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data: vcalloc(size)
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len: a.len
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cap: a.cap
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}
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// Recursively clone-generated elements if array element is array type
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if depth > 0 && a.element_size == sizeof(array) && a.len >= 0 && a.cap >= a.len {
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for i in 0 .. a.len {
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ar := array{}
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unsafe { vmemcpy(&ar, a.get_unsafe(i), int(sizeof(array))) }
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ar_clone := unsafe { ar.clone_to_depth(depth - 1) }
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unsafe { arr.set_unsafe(i, &ar_clone) }
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}
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return arr
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} else {
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if !isnil(a.data) {
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unsafe { vmemcpy(&byte(arr.data), a.data, a.cap * a.element_size) }
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}
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return arr
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}
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}
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// we manually inline this for single operations for performance without -prod
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[inline; unsafe]
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fn (mut a array) set_unsafe(i int, val voidptr) {
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unsafe { vmemcpy(&byte(a.data) + a.element_size * i, val, a.element_size) }
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}
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// Private function. Used to implement assigment to the array element.
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fn (mut a array) set(i int, val voidptr) {
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$if !no_bounds_checking ? {
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if i < 0 || i >= a.len {
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panic('array.set: index out of range (i == $i, a.len == $a.len)')
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}
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}
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unsafe { vmemcpy(&byte(a.data) + a.element_size * i, val, a.element_size) }
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}
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fn (mut a array) push(val voidptr) {
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a.ensure_cap(a.len + 1)
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unsafe { vmemmove(&byte(a.data) + a.element_size * a.len, val, a.element_size) }
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a.len++
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}
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// push_many implements the functionality for pushing another array.
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// `val` is array.data and user facing usage is `a << [1,2,3]`
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[unsafe]
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pub fn (mut a3 array) push_many(val voidptr, size int) {
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if a3.data == val && !isnil(a3.data) {
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// handle `arr << arr`
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copy := a3.clone()
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a3.ensure_cap(a3.len + size)
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unsafe {
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// vmemcpy(a.data, copy.data, copy.element_size * copy.len)
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vmemcpy(a3.get_unsafe(a3.len), copy.data, a3.element_size * size)
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}
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} else {
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a3.ensure_cap(a3.len + size)
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if !isnil(a3.data) && !isnil(val) {
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unsafe { vmemcpy(a3.get_unsafe(a3.len), val, a3.element_size * size) }
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}
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}
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a3.len += size
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}
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// reverse_in_place reverses existing array data, modifying original array.
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pub fn (mut a array) reverse_in_place() {
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if a.len < 2 {
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return
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}
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unsafe {
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mut tmp_value := malloc(a.element_size)
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for i in 0 .. a.len / 2 {
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vmemcpy(tmp_value, &byte(a.data) + i * a.element_size, a.element_size)
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vmemcpy(&byte(a.data) + i * a.element_size, &byte(a.data) +
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(a.len - 1 - i) * a.element_size, a.element_size)
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vmemcpy(&byte(a.data) + (a.len - 1 - i) * a.element_size, tmp_value, a.element_size)
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}
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free(tmp_value)
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}
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}
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// reverse returns a new array with the elements of the original array in reverse order.
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pub fn (a array) reverse() array {
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if a.len < 2 {
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return a
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}
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mut arr := array{
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element_size: a.element_size
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data: vcalloc(a.cap * a.element_size)
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len: a.len
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cap: a.cap
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}
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for i in 0 .. a.len {
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unsafe { arr.set_unsafe(i, a.get_unsafe(a.len - 1 - i)) }
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}
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return arr
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}
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// pub fn (a []int) free() {
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// free frees all memory occupied by the array.
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[unsafe]
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pub fn (a &array) free() {
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$if prealloc {
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return
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}
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// if a.is_slice {
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// return
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// }
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unsafe { free(&byte(a.data) - a.offset) }
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}
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// filter creates a new array with all elements that pass the test implemented by the provided function
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pub fn (a array) filter(predicate fn (voidptr) bool) array
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struct ZZZTmp1 {}
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// any tests whether at least one element in the array passes the test implemented by the
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// provided function. It returns true if, in the array, it finds an element for which the provided
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// function returns true; otherwise it returns false. It doesn't modify the array
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pub fn (a array) any(predicate fn (voidptr) bool) bool
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struct ZZZTmp2 {}
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// all tests whether all elements in the array pass the test implemented by the provided function
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pub fn (a array) all(predicate fn (voidptr) bool) bool
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struct ZZZTmp3 {}
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// map creates a new array populated with the results of calling a provided function
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// on every element in the calling array
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pub fn (a array) map(callback fn (voidptr) voidptr) array
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struct ZZZTmp4 {}
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// sort sorts an array in place in ascending order.
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pub fn (mut a array) sort(callback fn (voidptr, voidptr) int)
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struct ZZZTmp5 {}
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// contains determines whether an array includes a certain value among its entries
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pub fn (a array) contains(val voidptr) bool
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struct ZZZTmp6 {}
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// index returns the first index at which a given element can be found in the array
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// or -1 if the value is not found.
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pub fn (a array) index(value voidptr) int
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[unsafe]
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pub fn (mut a []string) free() {
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|
$if prealloc {
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return
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}
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for s in a {
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unsafe { s.free() }
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}
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unsafe { free(a.data) }
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}
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// str returns a string representation of the array of strings
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// => '["a", "b", "c"]'.
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[manualfree]
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pub fn (a []string) str() string {
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mut sb := strings.new_builder(a.len * 3)
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sb.write_string('[')
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|
for i in 0 .. a.len {
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|
val := a[i]
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|
sb.write_string("'")
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|
sb.write_string(val)
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|
sb.write_string("'")
|
|
if i < a.len - 1 {
|
|
sb.write_string(', ')
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|
}
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|
}
|
|
sb.write_string(']')
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|
res := sb.str()
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|
unsafe { sb.free() }
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|
return res
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|
}
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|
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// hex returns a string with the hexadecimal representation
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|
// of the byte elements of the array.
|
|
pub fn (b []byte) hex() string {
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|
mut hex := unsafe { malloc(b.len * 2 + 1) }
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|
mut dst_i := 0
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|
for i in b {
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|
n0 := i >> 4
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|
unsafe {
|
|
hex[dst_i] = if n0 < 10 { n0 + `0` } else { n0 + byte(87) }
|
|
dst_i++
|
|
}
|
|
n1 := i & 0xF
|
|
unsafe {
|
|
hex[dst_i] = if n1 < 10 { n1 + `0` } else { n1 + byte(87) }
|
|
dst_i++
|
|
}
|
|
}
|
|
unsafe {
|
|
hex[dst_i] = 0
|
|
return tos(hex, dst_i)
|
|
}
|
|
}
|
|
|
|
// copy copies the `src` byte array elements to the `dst` byte array.
|
|
// The number of the elements copied is the minimum of the length of both arrays.
|
|
// Returns the number of elements copied.
|
|
// TODO: implement for all types
|
|
pub fn copy(dst []byte, src []byte) int {
|
|
min := if dst.len < src.len { dst.len } else { src.len }
|
|
if min > 0 {
|
|
unsafe { vmemcpy(&byte(dst.data), src.data, min) }
|
|
}
|
|
return min
|
|
}
|
|
|
|
// reduce executes a given reducer function on each element of the array,
|
|
// resulting in a single output value.
|
|
pub fn (a []int) reduce(iter fn (int, int) int, accum_start int) int {
|
|
mut accum_ := accum_start
|
|
for i in a {
|
|
accum_ = iter(accum_, i)
|
|
}
|
|
return accum_
|
|
}
|
|
|
|
// grow_cap grows the array's capacity by `amount` elements.
|
|
pub fn (mut a array) grow_cap(amount int) {
|
|
a.ensure_cap(a.cap + amount)
|
|
}
|
|
|
|
// grow_len ensures that an array has a.len + amount of length
|
|
[unsafe]
|
|
pub fn (mut a array) grow_len(amount int) {
|
|
a.ensure_cap(a.len + amount)
|
|
a.len += amount
|
|
}
|
|
|
|
// pointers returns a new array, where each element
|
|
// is the address of the corresponding element in the array.
|
|
[unsafe]
|
|
pub fn (a array) pointers() []voidptr {
|
|
mut res := []voidptr{}
|
|
for i in 0 .. a.len {
|
|
unsafe { res << a.get_unsafe(i) }
|
|
}
|
|
return res
|
|
}
|
|
|
|
// voidptr.vbytes() - makes a V []byte structure from a C style memory buffer. NB: the data is reused, NOT copied!
|
|
[unsafe]
|
|
pub fn (data voidptr) vbytes(len int) []byte {
|
|
res := array{
|
|
element_size: 1
|
|
data: data
|
|
len: len
|
|
cap: len
|
|
}
|
|
return res
|
|
}
|
|
|
|
// byteptr.vbytes() - makes a V []byte structure from a C style memory buffer. NB: the data is reused, NOT copied!
|
|
[unsafe]
|
|
pub fn (data &byte) vbytes(len int) []byte {
|
|
return unsafe { voidptr(data).vbytes(len) }
|
|
}
|