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v/vlib/builtin/int.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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module builtin
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#include <float.h>
import const (
DBL_EPSILON
)
pub fn (d double) str() string {
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buf := malloc(sizeof(double) * 5 + 1)// TODO
C.sprintf(buf, '%f', d)
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return tos(buf, strlen(buf))
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}
pub fn (d f64) str() string {
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buf := malloc(sizeof(double) * 5 + 1)// TODO
C.sprintf(buf, '%f', d)
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return tos(buf, strlen(buf))
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}
pub fn (d f32) str() string {
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buf := malloc(sizeof(double) * 5 + 1)// TODO
C.sprintf(buf, '%f', d)
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return tos(buf, strlen(buf))
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}
pub fn ptr_str(ptr voidptr) string {
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buf := malloc(sizeof(double) * 5 + 1)// TODO
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
pub fn (a f64) eq(b f64) bool {
return C.fabs(a - b) <= DBL_EPSILON
}
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// fn (nn i32) str() string {
// return i
// }
pub fn (nn int) str() string {
mut n := nn
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if n == 0 {
return '0'
}
max := 16
mut buf := malloc(max)
mut len := 0
mut is_neg := false
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if n < 0 {
n = -n
is_neg = true
}
// Fill the string from the end
for n > 0 {
d := n % 10
buf[max - len - 1] = d + int(`0`)
len++
n = n / 10
}
// Prepend - if it's negative
if is_neg {
buf[max - len - 1] = `-`
len++
}
return tos(buf + max - len, len)
}
pub fn (nn u8) str() string {
mut n := nn
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if n == u8(0) {
return '0'
}
max := 5
mut buf := malloc(max)
mut len := 0
mut is_neg := false
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if n < u8(0) {
n = -n
is_neg = true
}
// Fill the string from the end
for n > u8(0) {
d := n % u8(10)
buf[max - len - 1] = d + u8(`0`)
len++
n = n / u8(10)
}
// Prepend - if it's negative
if is_neg {
buf[max - len - 1] = `-`
len++
}
return tos(buf + max - len, len)
}
pub fn (nn i64) str() string {
mut n := nn
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if n == i64(0) {
return '0'
}
max := 32
mut buf := malloc(max)
mut len := 0
mut is_neg := false
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if n < i64(0) {
n = -n
is_neg = true
}
// Fill the string from the end
for n > i64(0) {
d := int(n % i64(10))
buf[max - len - 1] = d + int(`0`)
len++
n = n / i64(10)
}
// Prepend - if it's negative
if is_neg {
buf[max - len - 1] = `-`
len++
}
return tos(buf + max - len, len)
}
pub fn (b bool) str() string {
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if b {
return 'true'
}
return 'false'
}
pub fn (n int) hex() string {
len := if n >= 0 {
n.str().len + 3
} else {
11
}
hex := malloc(len) // 0x + \n
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count := int(C.sprintf(hex, '0x%x', n))
return tos(hex, count)
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}
pub fn (n i64) hex() string {
len := if n >= i64(0) {
n.str().len + 3
} else {
19
}
hex := malloc(len)
count := int(C.sprintf(hex, '0x%x', n))
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 {
if aa == val {
return true
}
}
return false
}
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pub fn (c rune) str() string {
fst_byte := int(c) >> 8 * 3 & 0xff
len := utf8_char_len(fst_byte)
mut str := string {
len: len
str: malloc(len + 1)
}
for i := 0; i < len; i++ {
str.str[i] = int(c) >> 8 * (3 - i) & 0xff
}
str[len] = `\0`
return str
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}
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pub fn (c byte) str() string {
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mut str := string {
len: 1
str: malloc(2)
}
str.str[0] = c
str.str[1] = `\0`
return str
}
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pub fn (c byte) is_capital() bool {
return c >= `A` && c <= `Z`
}
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pub fn (b []byte) clone() []byte {
mut res := [byte(0); b.len]
for i := 0; i < b.len; i++ {
res[i] = b[i]
}
return res
}