v/vlib/builtin/js/string.js.v

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2020-12-08 17:49:20 +01:00
module builtin
pub struct string {
pub:
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str JS.String
len int
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}
pub fn (s string) slice(a int, b int) string {
return string(s.str.slice(a, b))
}
pub fn (s string) after(dot string) string {
return string(s.str.slice(s.str.lastIndexOf(dot.str) + 1, int(s.str.length)))
}
pub fn (s string) after_char(dot byte) string {
// TODO: Implement after byte
return s
}
pub fn (s string) all_after(dot string) string {
return string(s.str.slice(s.str.indexOf(dot.str) + 1, int(s.str.length)))
}
// why does this exist?
pub fn (s string) all_after_last(dot string) string {
return s.after(dot)
}
pub fn (s string) all_before(dot string) string {
return string(s.str.slice(0, s.str.indexOf(dot.str)))
}
pub fn (s string) all_before_last(dot string) string {
return string(s.str.slice(0, s.str.lastIndexOf(dot.str)))
}
pub fn (s string) bool() bool {
return s == 'true'
}
pub fn (s string) split(dot string) []string {
mut arr := s.str.split(dot.str).map(string(it))
#arr = new array(arr)
return arr
}
pub fn (s string) bytes() []byte {
sep := ''
mut arr := s.str.split(sep.str).map(it.charCodeAt(0))
#arr = new array(arr)
return arr
}
pub fn (s string) capitalize() string {
part := string(s.str.slice(1, int(s.str.length)))
return string(s.str.charAt(0).toUpperCase().concat(part.str))
}
pub fn (s string) clone() string {
return string(s.str)
}
pub fn (s string) contains(substr string) bool {
return s.str.includes(substr.str)
}
pub fn (s string) contains_any(chars string) bool {
sep := ''
for x in chars.str.split(sep.str) {
if s.str.includes(x) {
return true
}
}
return false
}
pub fn (s string) contains_any_substr(chars []string) bool {
for x in chars {
if s.str.includes(x.str) {
return true
}
}
return false
}
pub fn (s string) count(substr string) int {
// TODO: "error: `[]JS.String` is not a struct" when returning arr.length or arr.len
arr := s.str.split(substr.str)
return native_str_arr_len(arr)
}
pub fn (s string) ends_with(p string) bool {
mut res := false
#res.val = s.str.endsWith(p.str)
return res
}
pub fn (s string) starts_with(p string) bool {
return s.str.startsWith(p.str)
}
pub fn (s string) fields() []string {
mut res := []string{}
mut word_start := 0
mut word_len := 0
mut is_in_word := false
mut is_space := false
for i, c in s {
is_space = c in [32, 9, 10]
if !is_space {
word_len++
}
if !is_in_word && !is_space {
word_start = i
is_in_word = true
continue
}
if is_space && is_in_word {
res << s[word_start..word_start + word_len]
is_in_word = false
word_len = 0
word_start = 0
continue
}
}
if is_in_word && word_len > 0 {
// collect the remainder word at the end
res << s[word_start..s.len]
}
return res
}
pub fn (s string) find_between(start string, end string) string {
return string(s.str.slice(s.str.indexOf(start.str) + 1, s.str.indexOf(end.str)))
}
// unnecessary in the JS backend, implemented for api parity.
pub fn (s string) free() {}
pub fn (s string) hash() int {
mut h := u32(0)
if h == 0 && s.len > 0 {
for c in s {
h = h * 31 + u32(c)
}
}
return int(h)
}
// int returns the value of the string as an integer `'1'.int() == 1`.
pub fn (s string) int() int {
return int(JS.parseInt(s))
}
// i64 returns the value of the string as i64 `'1'.i64() == i64(1)`.
pub fn (s string) i64() i64 {
return i64(JS.parseInt(s))
}
// i8 returns the value of the string as i8 `'1'.i8() == i8(1)`.
pub fn (s string) i8() i8 {
return i8(JS.parseInt(s))
}
// i16 returns the value of the string as i16 `'1'.i16() == i16(1)`.
pub fn (s string) i16() i16 {
return i16(JS.parseInt(s))
}
// f32 returns the value of the string as f32 `'1.0'.f32() == f32(1)`.
pub fn (s string) f32() f32 {
// return C.atof(&char(s.str))
return f32(JS.parseFloat(s))
}
// f64 returns the value of the string as f64 `'1.0'.f64() == f64(1)`.
pub fn (s string) f64() f64 {
return f64(JS.parseFloat(s))
}
// u16 returns the value of the string as u16 `'1'.u16() == u16(1)`.
pub fn (s string) u16() u16 {
return u16(JS.parseInt(s))
}
// u32 returns the value of the string as u32 `'1'.u32() == u32(1)`.
pub fn (s string) u32() u32 {
return u32(JS.parseInt(s))
}
// u64 returns the value of the string as u64 `'1'.u64() == u64(1)`.
pub fn (s string) u64() u64 {
return u64(JS.parseInt(s))
}
// trim_right strips any of the characters given in `cutset` from the right of the string.
// Example: assert ' Hello V d'.trim_right(' d') == ' Hello V'
pub fn (s string) trim_right(cutset string) string {
if s.len < 1 || cutset.len < 1 {
return s.clone()
}
mut pos := s.len - 1
for pos >= 0 {
mut found := false
for cs in cutset {
if s[pos] == cs {
found = true
}
}
if !found {
break
}
pos--
}
if pos < 0 {
return ''
}
return s[..pos + 1]
}
// trim_left strips any of the characters given in `cutset` from the left of the string.
// Example: assert 'd Hello V developer'.trim_left(' d') == 'Hello V developer'
[direct_array_access]
pub fn (s string) trim_left(cutset string) string {
if s.len < 1 || cutset.len < 1 {
return s.clone()
}
mut pos := 0
for pos < s.len {
mut found := false
for cs in cutset {
if s[pos] == cs {
found = true
break
}
}
if !found {
break
}
pos++
}
return s[pos..]
}
// trim_prefix strips `str` from the start of the string.
// Example: assert 'WorldHello V'.trim_prefix('World') == 'Hello V'
pub fn (s string) trim_prefix(str string) string {
if s.starts_with(str) {
return s[str.len..]
}
return s.clone()
}
// trim_suffix strips `str` from the end of the string.
// Example: assert 'Hello VWorld'.trim_suffix('World') == 'Hello V'
pub fn (s string) trim_suffix(str string) string {
if s.ends_with(str) {
return s[..s.len - str.len]
}
return s.clone()
}
// compare_strings returns `-1` if `a < b`, `1` if `a > b` else `0`.
pub fn compare_strings(a &string, b &string) int {
if a < b {
return -1
}
if a > b {
return 1
}
return 0
}
// compare_strings_reverse returns `1` if `a < b`, `-1` if `a > b` else `0`.
fn compare_strings_reverse(a &string, b &string) int {
if a < b {
return 1
}
if a > b {
return -1
}
return 0
}
// compare_strings_by_len returns `-1` if `a.len < b.len`, `1` if `a.len > b.len` else `0`.
fn compare_strings_by_len(a &string, b &string) int {
if a.len < b.len {
return -1
}
if a.len > b.len {
return 1
}
return 0
}
// compare_lower_strings returns the same as compare_strings but converts `a` and `b` to lower case before comparing.
fn compare_lower_strings(a &string, b &string) int {
aa := a.to_lower()
bb := b.to_lower()
return compare_strings(&aa, &bb)
}
// at returns the byte at index `idx`.
// Example: assert 'ABC'.at(1) == byte(`B`)
fn (s string) at(idx int) byte {
mut result := byte(0)
#result = new byte(s.str.charCodeAt(result))
return result
}
pub fn (s string) to_lower() string {
mut result := ''
#let str = s.str.toLowerCase()
#result = new string(str)
return result
}
// TODO: check if that behaves the same as V's own string.replace(old_sub,new_sub):
pub fn (s string) replace(old_sub string, new_sub string) string {
mut result := ''
#result = new string( s.str.replaceAll(old_sub.str, new_sub.str) )
return result
}
pub fn (s string) to_upper() string {
mut result := ''
#let str = s.str.toUpperCase()
#result = new string(str)
return result
}
// sort sorts the string array.
pub fn (mut s []string) sort() {
s.sort_with_compare(compare_strings)
}
// sort_ignore_case sorts the string array using case insesitive comparing.
pub fn (mut s []string) sort_ignore_case() {
s.sort_with_compare(compare_lower_strings)
}
// sort_by_len sorts the the string array by each string's `.len` length.
pub fn (mut s []string) sort_by_len() {
s.sort_with_compare(compare_strings_by_len)
}
// str returns a copy of the string
pub fn (s string) str() string {
return s.clone()
}
pub fn (s string) repeat(count int) string {
mut result := ''
#result = new string(s.str.repeat(count))
return result
}
// TODO(playX): Use this iterator instead of using .split('').map(c => byte(c))
#function string_iterator(string) { this.stringIteratorFieldIndex = 0; this.stringIteratorIteratedString = string.str; }
#string_iterator.prototype.next = function next() {
#var done = true;
#var value = undefined;
#var position = this.stringIteratorFieldIndex;
#if (position !== -1) {
#var string = this.stringIteratorIteratedString;
#var length = string.length >>> 0;
#if (position >= length) {
#this.stringIteratorFieldIndex = -1;
#} else {
#done = false;
#var first = string.charCodeAt(position);
#if (first < 0xD800 || first > 0xDBFF || position + 1 === length)
#value = new byte(string[position]);
#else {
#value = new byte(string[position]+string[position+1])
#}
#this.stringIteratorFieldIndex = position + value.length;
#}
#}
#return {
#value, done
#}
#}
#string.prototype[Symbol.iterator] = function () { return new string_iterator(this) }
// TODO: Make these functions actually work.
// strip_margin allows multi-line strings to be formatted in a way that removes white-space
// before a delimeter. by default `|` is used.
// Note: the delimiter has to be a byte at this time. That means surrounding
// the value in ``.
//
// Example:
// st := 'Hello there,
// |this is a string,
// | Everything before the first | is removed'.strip_margin()
// Returns:
// Hello there,
// this is a string,
// Everything before the first | is removed
pub fn (s string) strip_margin() string {
return s.strip_margin_custom(`|`)
}
// strip_margin_custom does the same as `strip_margin` but will use `del` as delimiter instead of `|`
[direct_array_access]
pub fn (s string) strip_margin_custom(del byte) string {
mut sep := del
if sep.is_space() {
eprintln('Warning: `strip_margin` cannot use white-space as a delimiter')
eprintln(' Defaulting to `|`')
sep = `|`
}
// don't know how much space the resulting string will be, but the max it
// can be is this big
mut ret := []byte{}
#ret = new array()
mut count := 0
for i := 0; i < s.len; i++ {
if s[i] in [10, 13] {
unsafe {
ret[count] = s[i]
}
count++
// CRLF
if s[i] == 13 && i < s.len - 1 && s[i + 1] == 10 {
unsafe {
ret[count] = s[i + 1]
}
count++
i++
}
for s[i] != sep {
i++
if i >= s.len {
break
}
}
} else {
unsafe {
ret[count] = s[i]
}
count++
}
}
/*
unsafe {
ret[count] = 0
return ret.vstring_with_len(count)
}*/
mut result := ''
#for (let x of ret.arr) result.str += String.fromCharCode(x.val)
return result
}
// split_nth splits the string based on the passed `delim` substring.
// It returns the first Nth parts. When N=0, return all the splits.
// The last returned element has the remainder of the string, even if
// the remainder contains more `delim` substrings.
[direct_array_access]
pub fn (s string) split_nth(delim string, nth int) []string {
mut res := []string{}
mut i := 0
match delim.len {
0 {
i = 1
for ch in s {
if nth > 0 && i >= nth {
res << s[i..]
break
}
res << ch.str()
i++
}
return res
}
1 {
mut start := 0
delim_byte := delim[0]
for i < s.len {
if s[i] == delim_byte {
was_last := nth > 0 && res.len == nth - 1
if was_last {
break
}
val := s[start..i] //.substr(start, i)
res << val
start = i + delim.len
i = start
} else {
i++
}
}
// Then the remaining right part of the string
if nth < 1 || res.len < nth {
res << s[start..]
}
return res
}
else {
mut start := 0
// Take the left part for each delimiter occurence
for i <= s.len {
is_delim := i + delim.len <= s.len && s[i..i + delim.len] == delim
if is_delim {
was_last := nth > 0 && res.len == nth - 1
if was_last {
break
}
val := s[start..i] // .substr(start, i)
res << val
start = i + delim.len
i = start
} else {
i++
}
}
// Then the remaining right part of the string
if nth < 1 || res.len < nth {
res << s[start..]
}
return res
}
}
}
struct RepIndex {
idx int
val_idx int
}
// replace_each replaces all occurences of the string pairs given in `vals`.
// Example: assert 'ABCD'.replace_each(['B','C/','C','D','D','C']) == 'AC/DC'
[direct_array_access]
pub fn (s string) replace_each(vals []string) string {
if s.len == 0 || vals.len == 0 {
return s.clone()
}
if vals.len % 2 != 0 {
eprintln('string.replace_each(): odd number of strings')
return s.clone()
}
// `rep` - string to replace
// `with_` - string to replace with_
// Remember positions of all rep strings, and calculate the length
// of the new string to do just one allocation.
mut idxs := []RepIndex{}
mut idx := 0
s_ := s.clone()
#function setCharAt(str,index,chr) {
#if(index > str.length-1) return str;
#return str.substring(0,index) + chr + str.substring(index+1);
#}
for rep_i := 0; rep_i < vals.len; rep_i += 2 {
rep := vals[rep_i]
mut with_ := vals[rep_i + 1]
with_ = with_
for {
idx = s_.index_after(rep, idx)
if idx == -1 {
break
}
for i in 0 .. rep.len {
mut j_ := i
j_ = j_
#s_.str = setCharAt(s_.str,idx + i, String.fromCharCode(127))
}
idxs << RepIndex{
idx: idx
val_idx: rep_i
}
idx += rep.len
}
}
if idxs.len == 0 {
return s.clone()
}
idxs.sort(a.idx < b.idx)
mut b := ''
mut idx_pos := 0
mut cur_idx := idxs[idx_pos]
mut b_i := 0
for i := 0; i < s.len; i++ {
if i == cur_idx.idx {
rep := vals[cur_idx.val_idx]
with_ := vals[cur_idx.val_idx + 1]
for j in 0 .. with_.len {
mut j_ := j
j_ = j_
#b.str = setCharAt(b.str,b_i, with_.str[j])
//#b.str[b_i] = with_.str[j]
b_i++
}
i += rep.len - 1
idx_pos++
if idx_pos < idxs.len {
cur_idx = idxs[idx_pos]
}
} else {
#b.str = setCharAt(b.str,b_i,s.str[i]) //b.str[b_i] = s.str[i]
b_i++
}
}
return b
}
// last_index returns the position of the last occurence of the input string.
fn (s string) last_index_(p string) int {
if p.len > s.len || p.len == 0 {
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
}
// last_index returns the position of the last occurence of the input string.
pub fn (s string) last_index(p string) ?int {
idx := s.last_index_(p)
if idx == -1 {
return none
}
return idx
}
pub fn (s string) trim_space() string {
res := ''
#res.str = s.str.trim()
return res
}
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) split_into_lines() []string {
mut res := []string{}
#let i = 0
#s.str.split('\n').forEach((str) => {
#res.arr[i] = new string(str);
#})
return res
}