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https://github.com/vlang/v.git
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224 lines
4.3 KiB
V
224 lines
4.3 KiB
V
module builtin
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struct array {
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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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pub:
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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 int, 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: malloc(cap * elm_size)
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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, 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: malloc(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(val voidptr, nr_repeats int, 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: malloc(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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fn (a mut array) append_array(b array) {
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for i := 0; i < b.len; i++ {
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val := b[i]
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a._push(val)
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}
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}
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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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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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return
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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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fn (a mut array) prepend(val voidptr) {
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a.insert(0, val)
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}
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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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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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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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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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fn (s array) right(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(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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end = s.len
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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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}
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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 = malloc(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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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=$cap')
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if arr.cap == 0 {
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arr.data = malloc(cap * arr.element_size)
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}
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else {
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arr.data = C.realloc(arr.data, cap * arr.element_size)
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}
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arr.cap = cap
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}
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C.memcpy(arr.data + arr.element_size * arr.len, val, arr.element_size * size)
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arr.len += size
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}
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fn (a[]int) str() string {
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mut res := '['
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for i := 0; i < a.len; i++ {
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val := a[i]
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res += '$val'
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if i < a.len - 1 {
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res += ', '
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}
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}
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res += ']'
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return res
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}
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fn (a[]int) free() {
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// println('array free')
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C.free(a.data)
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}
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// TODO generic
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// "[ 'a', 'b', 'c' ]"
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fn (a[]string) str() string {
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mut res := '['
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for i := 0; i < a.len; i++ {
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val := a[i]
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res += '"$val"'
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if i < a.len - 1 {
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res += ', '
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}
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}
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res += ']'
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return res
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}
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fn free(a voidptr) {
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C.free(a)
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}
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