mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
223 lines
3.7 KiB
V
223 lines
3.7 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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#include <float.h>
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#include <math.h>
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pub fn (d f64) str() string {
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buf := malloc(sizeof(double) * 5 + 1)// TODO
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C.sprintf(buf, '%f', d)
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return tos(buf, strlen(buf))
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}
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pub fn (d f32) str() string {
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buf := malloc(sizeof(double) * 5 + 1)// TODO
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C.sprintf(buf, '%f', d)
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return tos(buf, strlen(buf))
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}
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pub fn ptr_str(ptr voidptr) string {
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buf := malloc(sizeof(double) * 5 + 1)// TODO
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C.sprintf(buf, '%p', ptr)
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return tos(buf, strlen(buf))
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}
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// compare floats using C epsilon
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pub fn (a f64) eq(b f64) bool {
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//return C.fabs(a - b) <= C.DBL_EPSILON
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return (a - b) <= C.DBL_EPSILON
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}
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// fn (nn i32) str() string {
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// return i
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// }
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pub fn (nn int) str() string {
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mut n := nn
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if n == 0 {
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return '0'
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}
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max := 16
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mut buf := calloc(max)
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mut len := 0
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mut is_neg := false
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if n < 0 {
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n = -n
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is_neg = true
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}
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// Fill the string from the end
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for n > 0 {
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d := n % 10
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buf[max - len - 1] = d + int(`0`)
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len++
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n = n / 10
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}
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// Prepend - if it's negative
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if is_neg {
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buf[max - len - 1] = `-`
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len++
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}
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return tos(buf + max - len, len)
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}
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pub fn (nn u32) str() string {
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mut n := nn
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if n == u32(0) {
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return '0'
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}
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max := 16
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mut buf := malloc(max)
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mut len := 0
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// Fill the string from the end
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for n > u32(0) {
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d := n % u32(10)
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buf[max - len - 1] = d + u32(`0`)
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len++
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n = n / u32(10)
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}
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return tos(buf + max - len, len)
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}
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/*
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pub fn (nn u8) str() string {
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mut n := nn
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if n == u8(0) {
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return '0'
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}
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max := 5
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mut buf := malloc(max)
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mut len := 0
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// Fill the string from the end
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for n > u8(0) {
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d := n % u8(10)
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buf[max - len - 1] = d + u8(`0`)
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len++
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n = n / u8(10)
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}
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return tos(buf + max - len, len)
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}
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*/
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pub fn (nn i64) str() string {
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mut n := nn
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if n == i64(0) {
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return '0'
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}
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max := 32
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mut buf := malloc(max)
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mut len := 0
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mut is_neg := false
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if n < i64(0) {
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n = -n
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is_neg = true
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}
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// Fill the string from the end
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for n > i64(0) {
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d := int(n % i64(10))
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buf[max - len - 1] = d + int(`0`)
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len++
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n = n / i64(10)
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}
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// Prepend - if it's negative
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if is_neg {
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buf[max - len - 1] = `-`
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len++
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}
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return tos(buf + max - len, len)
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}
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pub fn (nn u64) str() string {
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mut n := nn
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if n == u64(0) {
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return '0'
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}
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max := 32
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mut buf := malloc(max)
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mut len := 0
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// Fill the string from the end
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for n > u64(0) {
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d := n % u64(10)
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buf[max - len - 1] = d + u64(`0`)
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len++
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n = n / u64(10)
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}
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return tos(buf + max - len, len)
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}
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pub fn (b bool) str() string {
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if b {
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return 'true'
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}
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return 'false'
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}
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pub fn (n int) hex() string {
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len := if n >= 0 {
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n.str().len + 3
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} else {
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11
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}
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hex := malloc(len) // 0x + \n
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count := int(C.sprintf(hex, '0x%x', n))
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return tos(hex, count)
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}
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pub fn (n i64) hex() string {
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len := if n >= i64(0) {
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n.str().len + 3
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} else {
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19
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}
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hex := malloc(len)
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count := int(C.sprintf(hex, '0x%x', n))
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return tos(hex, count)
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}
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pub fn (a []byte) contains(val byte) bool {
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for aa in a {
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if aa == val {
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return true
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}
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}
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return false
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}
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pub fn (c rune) str() string {
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fst_byte := int(c) >> 8 * 3 & 0xff
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len := utf8_char_len(fst_byte)
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mut str := string {
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len: len
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str: malloc(len + 1)
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}
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for i := 0; i < len; i++ {
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str.str[i] = int(c) >> 8 * (3 - i) & 0xff
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}
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str[len] = `\0`
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return str
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}
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pub fn (c byte) str() string {
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mut str := string {
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len: 1
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str: malloc(2)
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}
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str.str[0] = c
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str.str[1] = `\0`
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return str
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}
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pub fn (c byte) is_capital() bool {
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return c >= `A` && c <= `Z`
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}
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pub fn (b []byte) clone() []byte {
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mut res := [byte(0); b.len]
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for i := 0; i < b.len; i++ {
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res[i] = b[i]
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}
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return res
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}
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