1254 lines
23 KiB
V
1254 lines
23 KiB
V
// Copyright (c) 2019-2020 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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import strconv
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/*
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NB: A V string should be/is immutable from the point of view of
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V user programs after it is first created. A V string is
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also slightly larger than the equivalent C string because
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the V string also has an integer length attached.
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This tradeoff is made, since V strings are created just *once*,
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but potentially used *many times* over their lifetime.
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The V string implementation uses a struct, that has a .str field,
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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
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is *very useful for C interoperability*.
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The V string implementation also has an integer .len field,
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containing the length of the .str field, excluding the
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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:
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a) a V string s can be used very easily, wherever a
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C string is needed, just by passing s.str,
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without a need for further conversion/copying.
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b) where strlen(s) is needed, you can just pass s.len,
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without having to constantly recompute the length of s
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*over and over again* like some C programs do. This is because
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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
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additional 0 in the .str field. The 0 *must* be put there by the
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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
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time, when used with pure V functions, but fail in strange ways,
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when used with modules using C functions (for example os and so on).
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*/
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pub struct string {
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// mut:
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// hash_cache int
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pub:
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str byteptr // points to a C style 0 terminated string of bytes.
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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:
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s string
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runes []int
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len int
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}
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pub fn vstrlen(s byteptr) int {
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return C.strlen(charptr(s))
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}
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// Converts a C string to a V string.
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// String data is reused, not copied.
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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')
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}
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return string{
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str: s
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len: len
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}
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}
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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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}
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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.
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// 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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}
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return string{
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str: s
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len: vstrlen(s)
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}
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}
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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 {
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panic('tos3: nil string')
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}
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return string{
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str: byteptr(s)
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len: C.strlen(s)
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}
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}
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pub fn (a string) clone() string {
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mut b := string{
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len: a.len
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str: malloc(a.len + 1)
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}
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for i := 0; i < a.len; i++ {
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b[i] = a[i]
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}
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b[a.len] = `\0`
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return b
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}
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/*
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pub fn (s string) cstr() byteptr {
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clone := s.clone()
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return clone.str
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}
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*/
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// cstring_to_vstring creates a copy of cstr and turns it into a v string
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pub fn cstring_to_vstring(cstr byteptr) string {
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slen := C.strlen(cstr)
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mut s := byteptr(memdup(cstr, slen + 1))
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s[slen] = `\0`
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return tos(s, slen)
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}
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pub fn (s string) replace_once(rep, with string) string {
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index := s.index(rep) or {
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return s
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}
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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 {
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if s.len == 0 || rep.len == 0 {
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return s
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}
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// TODO PERF Allocating ints is expensive. Should be a stack array
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// 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)
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if idx == -1 {
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break
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}
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idxs << idx
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idx += rep.len
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}
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// Dont change the string if there's nothing to replace
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if idxs.len == 0 {
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return s
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}
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// Now we know the number of replacements we need to do and we can calc the len of the new string
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new_len := s.len + idxs.len * (with.len - rep.len)
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mut b := malloc(new_len + 1) // add a newline just in case
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// Fill the new string
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mut idx_pos := 0
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mut cur_idx := idxs[idx_pos]
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mut b_i := 0
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for i := 0; i < s.len; i++ {
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// Reached the location of rep, replace it with "with"
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if i == cur_idx {
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for j := 0; j < with.len; j++ {
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b[b_i] = with[j]
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b_i++
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}
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// Skip the length of rep, since we just replaced it with "with"
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i += rep.len - 1
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// Go to the next index
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idx_pos++
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if idx_pos < idxs.len {
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cur_idx = idxs[idx_pos]
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}
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}
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// Rep doesnt start here, just copy
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else {
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b[b_i] = s[i]
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b_i++
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}
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}
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b[new_len] = `\0`
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return tos(b, new_len)
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}
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struct RepIndex {
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idx int
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val_idx int
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}
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fn compare_rep_index(a, b &RepIndex) int {
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if a.idx < b.idx {
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return -1
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}
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if a.idx > b.idx {
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return 1
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}
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return 0
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}
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fn (a mut []RepIndex) sort() {
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a.sort_with_compare(compare_rep_index)
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}
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// TODO
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/*
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fn (a RepIndex) < (b RepIndex) bool {
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return a.idx < b.idx
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}
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*/
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pub fn (s string) replace_each(vals []string) string {
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if s.len == 0 || vals.len == 0 {
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return s
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}
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if vals.len % 2 != 0 {
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println('string.replace_many(): odd number of strings')
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return s
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}
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// `rep` - string to replace
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// `with` - string to replace with
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// Remember positions of all rep strings, and calculate the length
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// of the new string to do just one allocation.
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mut new_len := s.len
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mut idxs := []RepIndex
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mut idx := 0
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for rep_i := 0; rep_i < vals.len; rep_i += 2 {
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// vals: ['rep1, 'with1', 'rep2', 'with2']
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rep := vals[rep_i]
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with := vals[rep_i + 1]
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for {
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idx = s.index_after(rep, idx)
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if idx == -1 {
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break
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}
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// We need to remember both the position in the string,
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// and which rep/with pair it refers to.
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idxs << RepIndex{
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idx:idx
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val_idx:rep_i}
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idx++
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new_len += with.len - rep.len
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}
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}
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// Dont change the string if there's nothing to replace
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if idxs.len == 0 {
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return s
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}
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idxs.sort()
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mut b := malloc(new_len + 1) // add a \0 just in case
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// Fill the new string
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mut idx_pos := 0
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mut cur_idx := idxs[idx_pos]
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mut b_i := 0
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for i := 0; i < s.len; i++ {
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// Reached the location of rep, replace it with "with"
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if i == cur_idx.idx {
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rep := vals[cur_idx.val_idx]
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with := vals[cur_idx.val_idx + 1]
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for j := 0; j < with.len; j++ {
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b[b_i] = with[j]
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b_i++
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}
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// Skip the length of rep, since we just replaced it with "with"
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i += rep.len - 1
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// Go to the next index
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idx_pos++
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if idx_pos < idxs.len {
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cur_idx = idxs[idx_pos]
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}
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}
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// Rep doesnt start here, just copy
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else {
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b[b_i] = s[i]
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b_i++
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}
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}
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b[new_len] = `\0`
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return tos(b, new_len)
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}
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pub fn (s string) bool() bool {
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return s == 'true' || s == 't' // TODO t for pg, remove
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}
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pub fn (s string) int() int {
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return int(strconv.common_parse_int(s, 0, 32, false, false))
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}
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pub fn (s string) i64() i64 {
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return strconv.common_parse_int(s, 0, 64, false, false)
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}
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pub fn (s string) i8() i8 {
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return i8(strconv.common_parse_int(s, 0, 8, false, false))
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}
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pub fn (s string) i16() i16 {
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return i16(strconv.common_parse_int(s, 0, 16, false, false))
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}
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pub fn (s string) f32() f32 {
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// return C.atof(charptr(s.str))
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return f32(strconv.atof64(s))
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}
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pub fn (s string) f64() f64 {
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// return C.atof(charptr(s.str))
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return strconv.atof64(s)
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}
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pub fn (s string) u16() u16 {
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return u16(strconv.common_parse_uint(s, 0, 16, false, false))
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}
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pub fn (s string) u32() u32 {
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return u32(strconv.common_parse_uint(s, 0, 32, false, false))
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}
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pub fn (s string) u64() u64 {
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return strconv.common_parse_uint(s, 0, 64, false, false)
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}
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// ==
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fn (s string) eq(a string) bool {
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if isnil(s.str) {
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// should never happen
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panic('string.eq(): nil string')
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}
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if s.len != a.len {
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return false
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}
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for i := 0; i < s.len; i++ {
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if s[i] != a[i] {
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return false
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}
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}
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return true
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}
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// !=
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fn (s string) ne(a string) bool {
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return !s.eq(a)
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}
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// s < a
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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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}
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else if s[i] < a[i] {
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return true
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}
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}
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if s.len < a.len {
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return true
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}
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return false
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}
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// s <= a
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fn (s string) le(a string) bool {
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return s.lt(a) || s.eq(a)
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}
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// s > a
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fn (s string) gt(a string) bool {
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return !s.le(a)
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}
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// s >= a
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fn (s string) ge(a string) bool {
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return !s.lt(a)
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}
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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
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mut res := string{
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len: new_len
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str: malloc(new_len + 1)
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}
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for j := 0; j < s.len; j++ {
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res[j] = s[j]
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}
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for j := 0; j < a.len; j++ {
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res[s.len + j] = a[j]
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}
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res[new_len] = `\0` // V strings are not null terminated, but just in case
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return res
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}
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pub fn (s string) split(delim string) []string {
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return s.split_nth(delim, 0)
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}
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/*
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split_nth - splits the string based on the passed `delim` substring.
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It returns the first Nth parts. When N=0, return all the splits.
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The last returned element has the remainder of the string, even if
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the remainder contains more `delim` substrings.
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*/
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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 {
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res << s.substr(i, s.len)
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break
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}
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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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}
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mut start := 0
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nth_1 := nth - 1
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for i <= s.len {
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mut is_delim := s[i] == delim[0]
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mut j := 0
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for is_delim && j < delim.len {
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is_delim = is_delim && s[i + j] == delim[j]
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j++
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}
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last := i == s.len - 1
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if is_delim || last {
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if !is_delim && last {
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i++
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}
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mut val := s.substr(start, i)
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if val.starts_with(delim) {
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val = val.right(delim.len)
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}
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was_last := nth > 0 && res.len == nth_1
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if was_last {
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res << s.right(start)
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break
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}
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res << val
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start = i + delim.len
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}
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i++
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}
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if s.ends_with(delim) && (nth < 1 || res.len < nth) {
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res << ''
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}
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return res
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}
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pub fn (s string) split_into_lines() []string {
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mut res := []string
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if s.len == 0 {
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return res
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}
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mut start := 0
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for i := 0; i < s.len; i++ {
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is_lf := s[i] == `\n`
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is_crlf := i != s.len - 1 && s[i] == `\r` && s[i + 1] == `\n`
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is_eol := is_lf || is_crlf
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is_last := if is_crlf {
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i == s.len - 2
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} else {
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i == s.len - 1
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}
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if is_eol || is_last {
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if is_last && !is_eol {
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i++
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}
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line := s.substr(start, i)
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res << line
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if is_crlf {
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i++
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}
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start = i + 1
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}
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}
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return res
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}
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// 'hello'.left(2) => 'he'
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fn (s string) left(n int) string {
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if n >= s.len {
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return s
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}
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return s.substr(0, n)
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}
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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 {
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return ''
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}
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return s.substr(n, s.len)
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}
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// used internally for [2..4]
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fn (s string) substr2(start, _end int, end_max bool) string {
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end := if end_max { s.len } else { _end }
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return s.substr(start, end)
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}
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pub fn (s string) substr(start, end int) string {
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$if !no_bounds_checking? {
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if start > end || start > s.len || end > s.len || start < 0 || end < 0 {
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panic('substr($start, $end) out of bounds (len=$s.len)')
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}
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}
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len := end - start
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mut res := 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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res.str[i] = s.str[start + i]
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}
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res.str[len] = `\0`
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/*
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res := string {
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str: s.str + start
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len: len
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}
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*/
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return res
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}
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pub fn (s string) index_old(p string) int {
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if p.len > s.len {
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return -1
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}
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mut i := 0
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for i < s.len {
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mut j := 0
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for j < p.len && s[i + j] == p[j] {
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j++
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}
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if j == p.len {
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return i
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}
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i++
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}
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return -1
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}
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pub fn (s string) index(p string) ?int {
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if p.len > s.len {
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return none
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}
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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
|
|
}
|
|
|
|
// KMP search
|
|
fn (s string) index_kmp(p string) int {
|
|
if p.len > s.len {
|
|
return -1
|
|
}
|
|
mut prefix := [0].repeat(p.len)
|
|
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
|
|
}
|
|
|
|
pub fn (s string) index_any(chars string) int {
|
|
for c in chars {
|
|
index := s.index(c.str()) or {
|
|
continue
|
|
}
|
|
return index
|
|
}
|
|
return -1
|
|
}
|
|
|
|
pub fn (s string) last_index(p string) ?int {
|
|
if p.len > s.len {
|
|
return none
|
|
}
|
|
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 none
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
// counts occurrences of substr in s
|
|
pub fn (s string) count(substr string) int {
|
|
if s.len == 0 || substr.len == 0 {
|
|
return 0
|
|
}
|
|
if substr.len > s.len {
|
|
return 0
|
|
}
|
|
mut n := 0
|
|
mut i := 0
|
|
for {
|
|
i = s.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
|
|
}
|
|
|
|
pub fn (s string) contains(p string) bool {
|
|
s.index(p) or {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
pub fn (s string) starts_with(p string) bool {
|
|
idx := s.index(p) or {
|
|
return false
|
|
}
|
|
return idx == 0
|
|
}
|
|
|
|
pub fn (s string) ends_with(p string) bool {
|
|
if p.len > s.len {
|
|
return false
|
|
}
|
|
idx := s.last_index(p) or {
|
|
return false
|
|
}
|
|
return idx == s.len - p.len
|
|
}
|
|
|
|
// TODO only works with ASCII
|
|
pub fn (s string) to_lower() string {
|
|
mut b := malloc(s.len + 1)
|
|
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 {
|
|
mut b := malloc(s.len + 1)
|
|
for i := 0; i < s.len; i++ {
|
|
b[i] = C.toupper(s.str[i])
|
|
}
|
|
return tos(b, s.len)
|
|
}
|
|
|
|
pub fn (s string) capitalize() string {
|
|
sl := s.to_lower()
|
|
cap := sl[0].str().to_upper() + sl.right(1)
|
|
return cap
|
|
}
|
|
|
|
pub fn (s string) title() string {
|
|
words := s.split(' ')
|
|
mut tit := []string
|
|
for word in words {
|
|
tit << word.capitalize()
|
|
}
|
|
title := tit.join(' ')
|
|
return title
|
|
}
|
|
|
|
// '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 ''
|
|
}
|
|
// First get everything to the right of 'start'
|
|
val := s.right(start_pos + start.len)
|
|
end_pos := val.index(end) or {
|
|
return val
|
|
}
|
|
return val.left(end_pos)
|
|
}
|
|
|
|
// TODO generic
|
|
fn (ar []string) contains(val string) bool {
|
|
for s in ar {
|
|
if s == val {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// TODO generic
|
|
fn (ar []int) contains(val int) bool {
|
|
for i, s in ar {
|
|
if s == val {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
/*
|
|
pub fn (a []string) to_c() voidptr {
|
|
mut res := malloc(sizeof(byteptr) * a.len)
|
|
for i := 0; i < a.len; i++ {
|
|
val := a[i]
|
|
res[i] = val.str
|
|
}
|
|
return res
|
|
}
|
|
*/
|
|
|
|
|
|
pub fn (c byte) is_space() bool {
|
|
return c in [` `, `\n`, `\t`, `\v`, `\f`, `\r`]
|
|
}
|
|
|
|
pub fn (s string) trim_space() string {
|
|
return s.trim(' \n\t\v\f\r')
|
|
}
|
|
|
|
pub fn (s string) trim(cutset string) string {
|
|
if s.len < 1 || cutset.len < 1 {
|
|
return s
|
|
}
|
|
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 ''
|
|
}
|
|
}
|
|
return s.substr(pos_left, pos_right + 1)
|
|
}
|
|
|
|
pub fn (s string) trim_left(cutset string) string {
|
|
if s.len < 1 || cutset.len < 1 {
|
|
return s
|
|
}
|
|
cs_arr := cutset.bytes()
|
|
mut pos := 0
|
|
for pos <= s.len && s[pos] in cs_arr {
|
|
pos++
|
|
}
|
|
return s.right(pos)
|
|
}
|
|
|
|
pub fn (s string) trim_right(cutset string) string {
|
|
if s.len < 1 || cutset.len < 1 {
|
|
return s
|
|
}
|
|
cs_arr := cutset.bytes()
|
|
mut pos := s.len - 1
|
|
for pos >= -1 && s[pos] in cs_arr {
|
|
pos--
|
|
}
|
|
return s.left(pos + 1)
|
|
}
|
|
|
|
// fn print_cur_thread() {
|
|
// //C.printf("tid = %08x \n", pthread_self());
|
|
// }
|
|
fn compare_strings(a, b &string) int {
|
|
if a.lt(b) {
|
|
return -1
|
|
}
|
|
if a.gt(b) {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
fn compare_strings_by_len(a, b &string) int {
|
|
if a.len < b.len {
|
|
return -1
|
|
}
|
|
if a.len > b.len {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
fn compare_lower_strings(a, b &string) int {
|
|
aa := a.to_lower()
|
|
bb := b.to_lower()
|
|
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() {
|
|
s.sort_with_compare(compare_lower_strings)
|
|
}
|
|
|
|
pub fn (s mut []string) sort_by_len() {
|
|
s.sort_with_compare(compare_strings_by_len)
|
|
}
|
|
|
|
pub fn (s string) ustring() ustring {
|
|
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])
|
|
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))
|
|
}
|
|
mut res := ustring{
|
|
s: s
|
|
}
|
|
res.runes = g_ustring_runes
|
|
res.runes.len = s.len
|
|
mut j := 0
|
|
for i := 0; i < s.len; i++ {
|
|
char_len := utf8_char_len(s.str[i])
|
|
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
|
|
}
|
|
|
|
pub fn (u ustring) substr(_start, _end int) string {
|
|
$if !no_bounds_checking? {
|
|
if _start > _end || _start > u.len || _end > u.len || _start < 0 || _end < 0 {
|
|
panic('substr($_start, $_end) out of bounds (len=$u.len)')
|
|
}
|
|
}
|
|
end := if _end >= u.len { u.s.len } else { u.runes[_end] }
|
|
return u.s.substr(u.runes[_start], end)
|
|
}
|
|
|
|
pub fn (u ustring) left(pos int) string {
|
|
if pos >= u.len {
|
|
return u.s
|
|
}
|
|
return u.substr(0, pos)
|
|
}
|
|
|
|
pub fn (u ustring) right(pos int) string {
|
|
if pos >= u.len {
|
|
return ''
|
|
}
|
|
return u.substr(pos, u.len)
|
|
}
|
|
|
|
fn (s string) at(idx int) byte {
|
|
$if !no_bounds_checking? {
|
|
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 !no_bounds_checking? {
|
|
if idx < 0 || idx >= u.len {
|
|
panic('string index out of range: $idx / $u.runes.len')
|
|
}
|
|
}
|
|
return u.substr(idx, idx + 1)
|
|
}
|
|
|
|
fn (u ustring) free() {
|
|
u.runes.free()
|
|
}
|
|
|
|
pub fn (c byte) is_digit() bool {
|
|
return c >= `0` && c <= `9`
|
|
}
|
|
|
|
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_bin_digit() bool {
|
|
return c == `0` || c == `1`
|
|
}
|
|
|
|
pub fn (c byte) is_letter() bool {
|
|
return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`)
|
|
}
|
|
|
|
pub fn (s string) free() {
|
|
free(s.str)
|
|
}
|
|
|
|
/*
|
|
fn (arr []string) free() {
|
|
for s in arr {
|
|
s.free()
|
|
}
|
|
C.free(arr.data)
|
|
}
|
|
*/
|
|
|
|
// 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
|
|
}
|
|
return s.left(pos)
|
|
}
|
|
|
|
pub fn (s string) all_before_last(dot string) string {
|
|
pos := s.last_index(dot) or {
|
|
return s
|
|
}
|
|
return s.left(pos)
|
|
}
|
|
|
|
pub fn (s string) all_after(dot string) string {
|
|
pos := s.last_index(dot) or {
|
|
return s
|
|
}
|
|
return s.right(pos + dot.len)
|
|
}
|
|
|
|
// fn (s []string) substr(a, b int) string {
|
|
// return join_strings(s.slice_fast(a, b))
|
|
// }
|
|
pub fn (a []string) join(del string) string {
|
|
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
|
|
}
|
|
|
|
pub fn (s []string) join_lines() string {
|
|
return s.join('\n')
|
|
}
|
|
|
|
// reverse will return a new reversed string.
|
|
pub fn (s string) reverse() string {
|
|
if s.len == 0 {
|
|
return ''
|
|
}
|
|
mut res := string{
|
|
len: s.len
|
|
str: malloc(s.len)
|
|
}
|
|
for i := s.len - 1; i >= 0; i-- {
|
|
res[s.len - i - 1] = s[i]
|
|
}
|
|
return res
|
|
}
|
|
|
|
// limit returns a portion of the string, starting at `0` and extending for a given number of characters afterward.
|
|
// 'hello'.limit(2) => 'he'
|
|
// 'hi'.limit(10) => 'hi'
|
|
pub fn (s string) limit(max int) string {
|
|
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 {
|
|
i := int(c)
|
|
return i == 10 || i == 32 || i == 9 || i == 13 || c == `\r`
|
|
}
|
|
|
|
pub fn (s string) hash() int {
|
|
// mut h := s.hash_cache
|
|
mut h := 0
|
|
if h == 0 && s.len > 0 {
|
|
for c in s {
|
|
h = h * 31 + int(c)
|
|
}
|
|
}
|
|
return h
|
|
}
|
|
|
|
pub fn (s string) bytes() []byte {
|
|
if s.len == 0 {
|
|
return []
|
|
}
|
|
mut buf := [byte(0)].repeat(s.len)
|
|
C.memcpy(buf.data, s.str, s.len)
|
|
return buf
|
|
}
|
|
|
|
// repeat returns a new string with a specified number of copies of the string it was called on.
|
|
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]
|
|
}
|
|
}
|
|
ret[s.len * count] = 0
|
|
return string(ret)
|
|
}
|