v/vlib/builtin/string.v

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2019-06-23 04:21:30 +02:00
// 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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import strconv
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/*
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NB: A V string should be/is immutable from the point of view of
V user programs after it is first created. A V string is
also slightly larger than the equivalent C string because
the V string also has an integer length attached.
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This tradeoff is made, since V strings are created just *once*,
but potentially used *many times* over their lifetime.
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The V string implementation uses a struct, that has a .str field,
which points to a C style 0 terminated memory block. Although not
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strictly necessary from the V point of view, that additional 0
is *very useful for C interoperability*.
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The V string implementation also has an integer .len field,
containing the length of the .str field, excluding the
terminating 0 (just like the C's strlen(s) would do).
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The 0 ending of .str, and the .len field, mean that in practice:
a) a V string s can be used very easily, wherever a
C string is needed, just by passing s.str,
without a need for further conversion/copying.
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b) where strlen(s) is needed, you can just pass s.len,
without having to constantly recompute the length of s
*over and over again* like some C programs do. This is because
V strings are immutable and so their length does not change.
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Ordinary V code *does not need* to be concerned with the
additional 0 in the .str field. The 0 *must* be put there by the
low level string creating functions inside this module.
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Failing to do this will lead to programs that work most of the
time, when used with pure V functions, but fail in strange ways,
when used with modules using C functions (for example os and so on).
*/
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pub struct string {
//mut:
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//hash_cache int
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pub:
str byteptr // points to a C style 0 terminated string of bytes.
len int // the length of the .str field, excluding the ending 0 byte. It is always equal to strlen(.str).
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}
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pub struct ustring {
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pub:
s string
runes []int
len int
}
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pub fn vstrlen(s byteptr) int {
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return C.strlen(charptr(s))
}
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// Converts a C string to a V string.
// String data is reused, not copied.
pub fn tos(s byteptr, len int) string {
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// This should never happen.
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if s == 0 {
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panic('tos(): nil string')
}
return string {
str: s
len: len
}
}
pub fn tos_clone(s byteptr) string {
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if s == 0 {
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panic('tos: nil string')
}
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return tos2(s).clone()
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}
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// Same as `tos`, but calculates the length. Called by `string(bytes)` casts.
// Used only internally.
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pub fn tos2(s byteptr) string {
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if s == 0 {
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panic('tos2: nil string')
}
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return string {
str: s
len: vstrlen(s)
}
}
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// Same as `tos2`, but for char*, to avoid warnings
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pub fn tos3(s charptr) string {
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if s == 0 {
panic('tos3: nil string')
}
return string {
str: byteptr(s)
len: C.strlen(s)
}
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}
pub fn (a string) clone() string {
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mut b := string {
len: a.len
str: malloc(a.len + 1)
}
for i := 0; i < a.len; i++ {
b[i] = a[i]
}
b[a.len] = `\0`
return b
}
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/*
pub fn (s string) cstr() byteptr {
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clone := s.clone()
return clone.str
}
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*/
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// cstring_to_vstring creates a copy of cstr and turns it into a v string
pub fn cstring_to_vstring(cstr byteptr) string {
slen := C.strlen(cstr)
mut s := byteptr( memdup(cstr, slen+1) )
s[slen] = `\0`
return tos(s, slen)
}
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pub fn (s string) replace_once(rep, with string) string {
index := s.index(rep) or { return s }
return s.substr(0,index) + with + s.substr(index + rep.len, s.len)
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}
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pub fn (s string) replace(rep, with string) string {
if s.len == 0 || rep.len == 0 {
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return s
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}
// TODO PERF Allocating ints is expensive. Should be a stack array
// Get locations of all reps within this string
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mut idxs := []int
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mut idx := 0
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for {
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idx = s.index_after(rep, idx)
if idx == -1 {
break
}
idxs << idx
idx++
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}
// Dont change the string if there's nothing to replace
if idxs.len == 0 {
return s
}
// Now we know the number of replacements we need to do and we can calc the len of the new string
new_len := s.len + idxs.len * (with.len - rep.len)
mut b := malloc(new_len + 1)// add a newline just in case
// Fill the new string
mut idx_pos := 0
mut cur_idx := idxs[idx_pos]
mut b_i := 0
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for i := 0; i < s.len; i++ {
// Reached the location of rep, replace it with "with"
if i == cur_idx {
for j := 0; j < with.len; j++ {
b[b_i] = with[j]
b_i++
}
// Skip the length of rep, since we just replaced it with "with"
i += rep.len - 1
// Go to the next index
idx_pos++
if idx_pos < idxs.len {
cur_idx = idxs[idx_pos]
}
}
// Rep doesnt start here, just copy
else {
b[b_i] = s[i]
b_i++
}
}
b[new_len] = `\0`
return tos(b, new_len)
}
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pub fn (s string) bool() bool {
return s == 'true' || s == 't' // TODO t for pg, remove
}
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pub fn (s string) int() int {
return int(strconv.common_parse_int(s,0,32, false, false))
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}
pub fn (s string) i64() i64 {
return strconv.common_parse_int(s, 0, 64, false, false)
}
pub fn (s string) f32() f32 {
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return C.atof(charptr(s.str))
}
pub fn (s string) f64() f64 {
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return C.atof(charptr(s.str))
}
pub fn (s string) u32() u32 {
return u32(strconv.common_parse_uint(s, 0, 32, false, false))
}
pub fn (s string) u64() u64 {
return strconv.common_parse_uint(s, 0, 64, false, false)
}
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// ==
fn (s string) eq(a string) bool {
if isnil(s.str) { // should never happen
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panic('string.eq(): nil string')
}
if s.len != a.len {
return false
}
for i := 0; i < s.len; i++ {
if s[i] != a[i] {
return false
}
}
return true
}
// !=
fn (s string) ne(a string) bool {
return !s.eq(a)
}
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// s < a
fn (s string) lt(a string) bool {
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for i := 0; i < s.len; i++ {
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if i >= a.len || s[i] > a[i] {
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return false
}
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else if s[i] < a[i] {
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return true
}
}
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if s.len < a.len {
return true
}
return false
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}
// s <= a
fn (s string) le(a string) bool {
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return s.lt(a) || s.eq(a)
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}
// s > a
fn (s string) gt(a string) bool {
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return !s.le(a)
}
// s >= a
fn (s string) ge(a string) bool {
return !s.lt(a)
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}
// TODO `fn (s string) + (a string)` ? To be consistent with operator overloading syntax.
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fn (s string) add(a string) string {
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new_len := a.len + s.len
mut res := string {
len: new_len
str: malloc(new_len + 1)
}
for j := 0; j < s.len; j++ {
res[j] = s[j]
}
for j := 0; j < a.len; j++ {
res[s.len + j] = a[j]
}
res[new_len] = `\0`// V strings are not null terminated, but just in case
return res
}
pub fn (s string) split(delim string) []string {
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return s.split_nth(delim, 0)
}
pub fn (s string) split_nth(delim string, nth int) []string {
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mut res := []string
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mut i := 0
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if delim.len == 0 {
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i = 1
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for ch in s {
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if nth > 0 && i >= nth {
res << s.substr(i, s.len)
break
}
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res << ch.str()
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i++
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}
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return res
}
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mut start := 0
for i <= s.len {
mut is_delim := s[i] == delim[0]
mut j := 0
for is_delim && j < delim.len {
is_delim = is_delim && s[i + j] == delim[j]
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j++
}
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was_last := nth > 0 && res.len == nth
if was_last{break}
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last := i == s.len - 1
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if is_delim || last {
if !is_delim && last {
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i++
}
mut val := s.substr(start, i)
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if val.starts_with(delim) {
val = val.right(delim.len)
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}
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res << val
start = i + delim.len
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}
i++
}
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if s.ends_with (delim) && (nth < 1 || res.len < nth) {
res << ''
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}
return res
}
pub fn (s string) split_into_lines() []string {
mut res := []string
if s.len == 0 {
return res
}
mut start := 0
for i := 0; i < s.len; i++ {
last := i == s.len - 1
if int(s[i]) == 10 || last {
if last {
i++
}
line := s.substr(start, i)
res << line
start = i + 1
}
}
return res
}
// 'hello'.left(2) => 'he'
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fn (s string) left(n int) string {
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if n >= s.len {
return s
}
return s.substr(0, n)
}
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// 'hello'.right(2) => 'llo'
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fn (s string) right(n int) string {
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if n >= s.len {
return ''
}
return s.substr(n, s.len)
}
// used internally for [2..4]
fn (s string) substr2(start, _end int, end_max bool) string {
end := if end_max { s.len } else { _end }
return s.substr(start, end)
}
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fn (s string) substr(start, end int) string {
if start > end || start > s.len || end > s.len || start < 0 || end < 0 {
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panic('substr($start, $end) out of bounds (len=$s.len)')
}
len := end - start
mut res := string {
len: len
str: malloc(len + 1)
}
for i := 0; i < len; i++ {
res.str[i] = s.str[start + i]
}
res.str[len] = `\0`
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/*
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res := string {
str: s.str + start
len: len
}
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*/
return res
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}
pub fn (s string) index_old(p string) int {
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if p.len > s.len {
return -1
}
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mut i := 0
for i < s.len {
mut j := 0
for j < p.len && s[i + j] == p[j] {
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j++
}
if j == p.len {
return i
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}
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i++
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}
return -1
}
pub fn (s string) index(p string) ?int {
if p.len > s.len {
return none
}
mut i := 0
for i < s.len {
mut j := 0
for j < p.len && s[i + j] == p[j] {
j++
}
if j == p.len {
return i
}
i++
}
return none
}
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// KMP search
pub fn (s string) index_kmp(p string) int {
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if p.len > s.len {
return -1
}
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mut prefix := [0].repeat(p.len)
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mut j := 0
for i := 1; i < p.len; i++ {
for p[j] != p[i] && j > 0 {
j = prefix[j - 1]
}
if p[j] == p[i] {
j++
}
prefix[i] = j
}
j = 0
for i := 0; i < s.len; i++ {
for p[j] != s[i] && j > 0 {
j = prefix[j - 1]
}
if p[j] == s[i] {
j++
}
if j == p.len {
return i - p.len + 1
}
}
return -1
}
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pub fn (s string) index_any(chars string) int {
for c in chars {
index := s.index(c.str()) or { continue }
return index
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}
return -1
}
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pub fn (s string) last_index(p string) int {
if p.len > s.len {
return -1
}
mut i := s.len - p.len
for i >= 0 {
mut j := 0
for j < p.len && s[i + j] == p[j] {
j++
}
if j == p.len {
return i
}
i--
}
return -1
}
pub fn (s string) index_after(p string, start int) int {
if p.len > s.len {
return -1
}
mut strt := start
if start < 0 {
strt = 0
}
if start >= s.len {
return -1
}
mut i := strt
for i < s.len {
mut j := 0
mut ii := i
for j < p.len && s[ii] == p[j] {
j++
ii++
}
if j == p.len {
return i
}
i++
}
return -1
}
pub fn (s string) index_byte(c byte) int {
for i:=0; i<s.len; i++ {
if s[i] == c {
return i
}
}
return -1
}
pub fn (s string) last_index_byte(c byte) int {
for i:=s.len-1; i>=0; i-- {
if s[i] == c {
return i
}
}
return -1
}
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// counts occurrences of substr in s
pub fn (s string) count(substr string) int {
if s.len == 0 || substr.len == 0 {
return 0
}
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if substr.len > s.len {
return 0
}
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mut n := 0
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mut i := 0
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for {
i = s.index_after(substr, i)
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if i == -1 {
return n
}
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i += substr.len
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n++
}
return 0 // TODO can never get here - v doesn't know that
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}
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pub fn (s string) contains(p string) bool {
_ = s.index(p) or {
return false
}
return true
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}
pub fn (s string) starts_with(p string) bool {
idx := s.index(p) or { return false }
return idx == 0
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}
pub fn (s string) ends_with(p string) bool {
if p.len > s.len {
return false
}
res := s.last_index(p) == s.len - p.len
return res
}
// TODO only works with ASCII
pub fn (s string) to_lower() string {
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mut b := malloc(s.len + 1)
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for i := 0; i < s.len; i++ {
b[i] = C.tolower(s.str[i])
}
return tos(b, s.len)
}
pub fn (s string) to_upper() string {
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mut b := malloc(s.len + 1)
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for i := 0; i < s.len; i++ {
b[i] = C.toupper(s.str[i])
}
return tos(b, s.len)
}
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pub fn (s string) capitalize() string {
sl := s.to_lower()
cap := sl[0].str().to_upper() + sl.right(1)
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return cap
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}
pub fn (s string) title() string {
words := s.split(' ')
mut tit := []string
for word in words {
tit << word.capitalize()
}
title := tit.join(' ')
return title
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}
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// 'hey [man] how you doin'
// find_between('[', ']') == 'man'
pub fn (s string) find_between(start, end string) string {
start_pos := s.index(start) or { return '' }
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// First get everything to the right of 'start'
val := s.right(start_pos + start.len)
end_pos := val.index(end) or { return val }
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return val.left(end_pos)
}
// TODO generic
fn (ar []string) contains(val string) bool {
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for s in ar {
if s == val {
return true
}
}
return false
}
// TODO generic
fn (ar []int) contains(val int) bool {
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for i, s in ar {
if s == val {
return true
}
}
return false
}
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/*
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pub fn (a []string) to_c() voidptr {
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mut res := malloc(sizeof(byteptr) * a.len)
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for i := 0; i < a.len; i++ {
val := a[i]
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res[i] = val.str
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}
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return res
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}
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*/
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pub fn (c byte) is_space() bool {
return c in [` `,`\n`,`\t`,`\v`,`\f`,`\r`]
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}
pub fn (s string) trim_space() string {
return s.trim(' \n\t\v\f\r')
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}
pub fn (s string) trim(cutset string) string {
if s.len < 1 || cutset.len < 1 {
return s
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}
cs_arr := cutset.bytes()
mut pos_left := 0
mut pos_right := s.len - 1
mut cs_match := true
for pos_left <= s.len && pos_right >= -1 && cs_match {
cs_match = false
if s[pos_left] in cs_arr {
pos_left++
cs_match = true
}
if s[pos_right] in cs_arr {
pos_right--
cs_match = true
}
if pos_left > pos_right {
return ''
}
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}
return s.substr(pos_left, pos_right+1)
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}
pub fn (s string) trim_left(cutset string) string {
if s.len < 1 || cutset.len < 1 {
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return s
}
cs_arr := cutset.bytes()
mut pos := 0
for pos <= s.len && s[pos] in cs_arr {
pos++
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}
return s.right(pos)
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}
pub fn (s string) trim_right(cutset string) string {
if s.len < 1 || cutset.len < 1 {
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return s
}
cs_arr := cutset.bytes()
mut pos := s.len - 1
for pos >= -1 && s[pos] in cs_arr {
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pos--
}
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return s.left(pos+1)
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}
// fn print_cur_thread() {
// //C.printf("tid = %08x \n", pthread_self());
// }
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fn compare_strings(a, b &string) int {
if a.lt(b) {
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return -1
}
if a.gt(b) {
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return 1
}
return 0
}
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fn compare_strings_by_len(a, b &string) int {
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if a.len < b.len {
return -1
}
if a.len > b.len {
return 1
}
return 0
}
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fn compare_lower_strings(a, b &string) int {
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aa := a.to_lower()
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bb := b.to_lower()
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return compare_strings(aa, bb)
}
pub fn (s mut []string) sort() {
s.sort_with_compare(compare_strings)
}
pub fn (s mut []string) sort_ignore_case() {
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s.sort_with_compare(compare_lower_strings)
}
pub fn (s mut []string) sort_by_len() {
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s.sort_with_compare(compare_strings_by_len)
}
pub fn (s string) ustring() ustring {
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mut res := ustring {
s: s
// runes will have at least s.len elements, save reallocations
// TODO use VLA for small strings?
runes: new_array(0, s.len, sizeof(int))
}
for i := 0; i < s.len; i++ {
char_len := utf8_char_len(s.str[i])
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res.runes << i
i += char_len - 1
res.len++
}
return res
}
// A hack that allows to create ustring without allocations.
// It's called from functions like draw_text() where we know that the string is going to be freed
// right away. Uses global buffer for storing runes []int array.
__global g_ustring_runes []int
pub fn (s string) ustring_tmp() ustring {
if g_ustring_runes.len == 0 {
g_ustring_runes = new_array(0, 128, sizeof(int))
}
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mut res := ustring {
s: s
}
res.runes = g_ustring_runes
res.runes.len = s.len
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mut j := 0
for i := 0; i < s.len; i++ {
char_len := utf8_char_len(s.str[i])
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res.runes[j] = i
j++
i += char_len - 1
res.len++
}
return res
}
fn (u ustring) eq(a ustring) bool {
if u.len != a.len || u.s != a.s {
return false
}
return true
}
fn (u ustring) ne(a ustring) bool {
return !u.eq(a)
}
fn (u ustring) lt(a ustring) bool {
return u.s < a.s
}
fn (u ustring) le(a ustring) bool {
return u.lt(a) || u.eq(a)
}
fn (u ustring) gt(a ustring) bool {
return !u.le(a)
}
fn (u ustring) ge(a ustring) bool {
return !u.lt(a)
}
fn (u ustring) add(a ustring) ustring {
mut res := ustring {
s: u.s + a.s
runes: new_array(0, u.s.len + a.s.len, sizeof(int))
}
mut j := 0
for i := 0; i < u.s.len; i++ {
char_len := utf8_char_len(u.s.str[i])
res.runes << j
i += char_len - 1
j += char_len
res.len++
}
for i := 0; i < a.s.len; i++ {
char_len := utf8_char_len(a.s.str[i])
res.runes << j
i += char_len - 1
j += char_len
res.len++
}
return res
}
pub fn (u ustring) index_after(p ustring, start int) int {
if p.len > u.len {
return -1
}
mut strt := start
if start < 0 {
strt = 0
}
if start > u.len {
return -1
}
mut i := strt
for i < u.len {
mut j := 0
mut ii := i
for j < p.len && u.at(ii) == p.at(j) {
j++
ii++
}
if j == p.len {
return i
}
i++
}
return -1
}
// counts occurrences of substr in s
pub fn (u ustring) count(substr ustring) int {
if u.len == 0 || substr.len == 0 {
return 0
}
if substr.len > u.len {
return 0
}
mut n := 0
mut i := 0
for {
i = u.index_after(substr, i)
if i == -1 {
return n
}
i += substr.len
n++
}
return 0 // TODO can never get here - v doesn't know that
}
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pub fn (u ustring) substr(_start, _end int) string {
if _start > _end || _start > u.len || _end > u.len || _start < 0 || _end < 0 {
panic('substr($_start, $_end) out of bounds (len=$u.len)')
}
end := if _end >= u.len {
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u.s.len
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}
else {
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u.runes[_end]
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}
return u.s.substr(u.runes[_start], end)
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}
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pub fn (u ustring) left(pos int) string {
if pos >= u.len {
return u.s
}
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return u.substr(0, pos)
}
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pub fn (u ustring) right(pos int) string {
if pos >= u.len {
return ''
}
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return u.substr(pos, u.len)
}
fn (s string) at(idx int) byte {
if idx < 0 || idx >= s.len {
panic('string index out of range: $idx / $s.len')
}
return s.str[idx]
}
pub fn (u ustring) at(idx int) string {
if idx < 0 || idx >= u.len {
panic('string index out of range: $idx / $u.runes.len')
}
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return u.substr(idx, idx + 1)
}
fn (u ustring) free() {
u.runes.free()
}
pub fn (c byte) is_digit() bool {
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return c >= `0` && c <= `9`
}
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pub fn (c byte) is_hex_digit() bool {
return c.is_digit() || (c >= `a` && c <= `f`) || (c >= `A` && c <= `F`)
}
pub fn (c byte) is_oct_digit() bool {
return c >= `0` && c <= `7`
}
pub fn (c byte) is_letter() bool {
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return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`)
}
pub fn (s string) free() {
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free(s.str)
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}
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/*
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fn (arr []string) free() {
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for s in arr {
s.free()
}
C.free(arr.data)
}
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*/
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// all_before('23:34:45.234', '.') == '23:34:45'
pub fn (s string) all_before(dot string) string {
pos := s.index(dot) or { return s }
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return s.left(pos)
}
pub fn (s string) all_before_last(dot string) string {
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pos := s.last_index(dot)
if pos == -1 {
return s
}
return s.left(pos)
}
pub fn (s string) all_after(dot string) string {
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pos := s.last_index(dot)
if pos == -1 {
return s
}
return s.right(pos + dot.len)
}
// fn (s []string) substr(a, b int) string {
// return join_strings(s.slice_fast(a, b))
// }
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pub fn (a []string) join(del string) string {
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if a.len == 0 {
return ''
}
mut len := 0
for i, val in a {
len += val.len + del.len
}
len -= del.len
// Allocate enough memory
mut res := ''
res.len = len
res.str = malloc(res.len + 1)
mut idx := 0
// Go thru every string and copy its every char one by one
for i, val in a {
for j := 0; j < val.len; j++ {
c := val[j]
res.str[idx] = val.str[j]
idx++
}
// Add del if it's not last
if i != a.len - 1 {
for k := 0; k < del.len; k++ {
res.str[idx] = del.str[k]
idx++
}
}
}
res.str[res.len] = `\0`
return res
}
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pub fn (s []string) join_lines() string {
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return s.join('\n')
}
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// reverse will return a new reversed string.
pub fn (s string) reverse() string {
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mut res := string {
len: s.len
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str: malloc(s.len)
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}
for i := s.len - 1; i >= 0; i-- {
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res[s.len-i-1] = s[i]
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}
return res
}
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// limit returns a portion of the string, starting at `0` and extending for a given number of characters afterward.
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// 'hello'.limit(2) => 'he'
// 'hi'.limit(10) => 'hi'
pub fn (s string) limit(max int) string {
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u := s.ustring()
if u.len <= max {
return s
}
return u.substr(0, max)
}
// TODO is_white_space()
pub fn (c byte) is_white() bool {
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i := int(c)
return i == 10 || i == 32 || i == 9 || i == 13 || c == `\r`
}
pub fn (s string) hash() int {
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//mut h := s.hash_cache
mut h := 0
if h == 0 && s.len > 0 {
for c in s {
h = h * 31 + int(c)
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}
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}
return h
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}
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pub fn (s string) bytes() []byte {
if s.len == 0 {
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return []
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}
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mut buf := [byte(0)].repeat(s.len)
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C.memcpy(buf.data, s.str, s.len)
return buf
}
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// repeat returns a new string with a specified number of copies of the string it was called on.
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pub fn (s string) repeat(count int) string {
if count <= 1 {
return s
}
mut ret := malloc(s.len * count + 1)
for i in 0..count {
for j in 0..s.len {
ret[i*s.len + j] = s[j]
}
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}
ret[s.len * count] = 0
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return string(ret)
}