mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
370 lines
7.6 KiB
V
370 lines
7.6 KiB
V
// Copyright (c) 2019 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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struct array {
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pub:
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// Using a void pointer allows to implement arrays without generics and without generating
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// extra code for every type.
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data voidptr
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len int
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cap int
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element_size int
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}
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// Private function, used by V (`nums := []int`)
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fn new_array(mylen, cap, elm_size int) array {
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arr := array {
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len: mylen
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cap: cap
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element_size: elm_size
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data: calloc(cap * elm_size)
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}
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return arr
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}
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// TODO
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pub fn make(len, cap, elm_size int) array {
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return new_array(len, cap, elm_size)
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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, cap, elm_size int, c_array voidptr) array {
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arr := array {
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len: len
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cap: cap
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element_size: elm_size
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data: calloc(cap * elm_size)
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}
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// TODO Write all memory functions (like memcpy) in V
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C.memcpy(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, cap, elm_size int, c_array voidptr) array {
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arr := array {
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len: len
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cap: cap
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element_size: elm_size
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data: c_array
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}
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return arr
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}
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// Private function, used by V (`[0; 100]`)
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fn array_repeat_old(val voidptr, nr_repeats, elm_size int) array {
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arr := array {
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len: nr_repeats
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cap: nr_repeats
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element_size: elm_size
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data: calloc(nr_repeats * elm_size)
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}
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for i := 0; i < nr_repeats; i++ {
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C.memcpy(arr.data + i * elm_size, val, elm_size)
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}
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return arr
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}
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pub fn (a array) repeat(nr_repeats int) array {
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arr := array {
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len: nr_repeats
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cap: nr_repeats
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element_size: a.element_size
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data: calloc(nr_repeats * a.element_size)
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}
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val := a.data + 0 //nr_repeats * a.element_size
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for i := 0; i < nr_repeats; i++ {
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C.memcpy(arr.data + i * a.element_size, val, a.element_size)
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}
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return arr
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}
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pub fn (a mut array) sort_with_compare(compare voidptr) {
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C.qsort(a.data, a.len, a.element_size, compare)
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}
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pub fn (a mut array) insert(i int, val voidptr) {
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if i >= a.len {
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panic('array.insert: index larger than length')
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}
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a.push(val)
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size := a.element_size
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C.memmove(a.data + (i + 1) * size, a.data + i * size, (a.len - i) * size)
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a.set(i, val)
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}
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pub fn (a mut array) prepend(val voidptr) {
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a.insert(0, val)
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}
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pub fn (a mut array) delete(idx int) {
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size := a.element_size
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C.memmove(a.data + idx * size, a.data + (idx + 1) * size, (a.len - idx) * size)
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a.len--
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a.cap--
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}
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fn (a array) get(i int) voidptr {
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if i < 0 || i >= a.len {
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panic('array index out of range: $i/$a.len')
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}
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return a.data + i * a.element_size
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}
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pub fn (a array) first() voidptr {
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if a.len == 0 {
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panic('array.first: empty array')
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}
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return a.data + 0
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}
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pub fn (a array) last() voidptr {
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if a.len == 0 {
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panic('array.last: empty array')
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}
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return a.data + (a.len - 1) * a.element_size
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}
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pub fn (s array) left(n int) array {
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if n >= s.len {
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return s
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}
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return s.slice(0, n)
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}
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pub fn (s array) right(n int) array {
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if n >= s.len {
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return new_array(0, 0, s.element_size)
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}
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return s.slice(n, s.len)
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}
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pub fn (s array) slice(start, _end int) array {
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mut end := _end
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if start > end {
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panic('invalid slice index: $start > $end')
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}
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if end > s.len {
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panic('runtime error: slice bounds out of range ($end >= $s.len)')
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}
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if start < 0 {
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panic('runtime error: slice bounds out of range ($start < 0)')
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}
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l := end - start
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res := array {
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element_size: s.element_size
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data: s.data + start * s.element_size
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len: l
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cap: l
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//is_slice: true
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}
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return res
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}
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fn (a mut array) set(idx int, val voidptr) {
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if idx < 0 || idx >= a.len {
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panic('array index out of range: $idx / $a.len')
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}
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C.memcpy(a.data + a.element_size * idx, val, a.element_size)
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}
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fn (arr mut array) push(val voidptr) {
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if arr.len >= arr.cap - 1 {
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cap := (arr.len + 1) * 2
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// println('_push: realloc, new cap=$cap')
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if arr.cap == 0 {
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arr.data = calloc(cap * arr.element_size)
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}
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else {
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arr.data = C.realloc(arr.data, cap * arr.element_size)
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}
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arr.cap = cap
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}
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C.memcpy(arr.data + arr.element_size * arr.len, val, arr.element_size)
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arr.len++
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}
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// `val` is array.data
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// TODO make private, right now it's used by strings.Builder
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pub fn (arr mut array) push_many(val voidptr, size int) {
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if arr.len >= arr.cap - size {
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cap := (arr.len + size) * 2
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// println('_push: realloc, new cap=$cap')
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if arr.cap == 0 {
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arr.data = calloc(cap * arr.element_size)
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}
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else {
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arr.data = C.realloc(arr.data, cap * arr.element_size)
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}
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arr.cap = cap
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}
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C.memcpy(arr.data + arr.element_size * arr.len, val, arr.element_size * size)
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arr.len += size
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}
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pub fn (a array) reverse() array {
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arr := array {
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len: a.len
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cap: a.cap
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element_size: a.element_size
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data: calloc(a.cap * a.element_size)
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}
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for i := 0; i < a.len; i++ {
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C.memcpy(arr.data + i * arr.element_size, &a[a.len-1-i], arr.element_size)
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}
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return arr
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}
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pub fn (a array) clone() array {
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arr := array {
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len: a.len
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cap: a.cap
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element_size: a.element_size
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data: calloc(a.cap * a.element_size)
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}
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C.memcpy(arr.data, a.data, a.cap * a.element_size)
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return arr
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}
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//pub fn (a []int) free() {
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[unsafe_fn]
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pub fn (a array) free() {
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//if a.is_slice {
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//return
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//}
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C.free(a.data)
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}
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// "[ 'a', 'b', 'c' ]"
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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('[')
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for i := 0; i < a.len; i++ {
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val := a[i]
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sb.write('"')
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sb.write(val)
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sb.write('"')
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if i < a.len - 1 {
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sb.write(', ')
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}
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}
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sb.write(']')
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return sb.str()
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}
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pub fn (b []byte) hex() string {
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mut hex := malloc(b.len*2+1)
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mut ptr := &hex[0]
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for i := 0; i < b.len ; i++ {
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ptr += C.sprintf(*char(ptr), '%02x', b[i])
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}
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return string(hex)
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}
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// TODO: implement for all types
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pub fn copy(dst, src []byte) int {
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if dst.len > 0 && src.len > 0 {
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min := if dst.len < src.len { dst.len } else { src.len }
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C.memcpy(dst.data, src.left(min).data, dst.element_size*min)
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return min
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}
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return 0
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}
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fn compare_ints(a, b &int) int {
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if a < b {
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return -1
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}
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if a > b {
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return 1
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}
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return 0
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}
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pub fn (a mut []int) sort() {
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a.sort_with_compare(compare_ints)
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}
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// Looking for an array index based on value.
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// If there is, it will return the index and if not, it will return `-1`
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pub fn (a []string) index(v string) int {
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for i := 0; i < a.len; i++ {
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if a[i] == v {
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return i
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}
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}
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return -1
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}
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pub fn (a []int) index(v int) int {
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for i := 0; i < a.len; i++ {
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if a[i] == v {
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return i
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}
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}
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return -1
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}
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pub fn (a []byte) index(v byte) int {
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for i := 0; i < a.len; i++ {
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if a[i] == v {
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return i
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}
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}
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return -1
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}
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pub fn (a []char) index(v char) int {
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for i := 0; i < a.len; i++ {
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if a[i] == v {
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return i
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}
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}
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return -1
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}
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////////////// FILTER //////////////
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// Creates a new array with all elements that pass the test implemented by the provided function.
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pub fn (a []string) filter2(predicate fn(p_val string, p_i int, p_arr []string) bool) []string
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{
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mut res := []string
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for i := 0; i < a.len; i++ {
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if predicate(a[i], i, a) {
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res << a[i]
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}
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}
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return res
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}
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pub fn (a []int) filter2(predicate fn(p_val, p_i int, p_arr []int) bool) []int
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{
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mut res := []int
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for i := 0; i < a.len; i++ {
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if predicate(a[i], i, a) {
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res << a[i]
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}
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}
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return res
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}
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////////////// REDUCE //////////////
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// Executes a reducer function (that you provide) on each element of the array,
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// resulting in a single output value.
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pub fn (a []int) reduce(iter fn (accum, curr int) int, accum_start int) int {
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mut _accum := 0
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_accum = accum_start
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for i := 0; i < a.len; i++ {
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_accum = iter(_accum, a[i])
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}
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return _accum
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}
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