mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
810 lines
14 KiB
Go
810 lines
14 KiB
Go
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module builtin
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// V strings are not null-terminated.
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struct string {
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pub:
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str byteptr
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len int
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}
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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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// For C strings only
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fn C.strlen(s byteptr) int
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fn todo() { }
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// Converts a C string to a V string
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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 isnil(s) {
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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 isnil(s) {
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panic('tos: nil string')
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return string{}
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}
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len := strlen(s)
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res := tos(s, len)
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return res.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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fn tos2(s byteptr) string {
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if isnil(s) {
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panic('tos2: nil string')
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return string{}
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}
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len := C.strlen(s)
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res := tos(s, len)
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return res
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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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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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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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// println('"$s" replace "$rep" with "$with" rep.len=$rep.len')
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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 rem := s
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mut rstart := 0
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for {
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mut i := rem.index(rep)
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if i < 0 {break}
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idxs << rstart + i
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i += rep.len
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rstart += i
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rem = rem.substr(i, rem.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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pub fn (s string) int() int {
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return C.atoi(s.str)
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}
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pub fn (s string) f32() f32 {
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return C.atof(s.str)
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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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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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pub 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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// println('string split delim="$delim" s="$s"')
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mut res := []string
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if delim.len == 0 {
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res << s
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return res
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}
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if delim.len == 1 {
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return s.split_single(delim[0])
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// println('split 1 only')
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// os.exit()
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}
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mut i := 0
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mut start := 0// - 1
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for i < s.len {
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// printiln(i)
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mut a := s[i] == delim[0]
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mut j := 1
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for j < delim.len && a {
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a = a && 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 a || last {
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if last {
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i++
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}
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mut val := s.substr(start, i)
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// println('got it "$val" start=$start i=$i delim="$delim"')
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if val.len > 0 {
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// todo perf
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// val now is '___VAL'. remove '___' from the start
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if val.starts_with(delim) {
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// println('!!')
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val = val.right(delim.len)
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}
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res << val.trim_space()
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}
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start = i
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}
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i++
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}
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return res
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}
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pub fn (s string) split_single(delim byte) []string {
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mut res := []string
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if int(delim) == 0 {
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res << s
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return res
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}
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mut i := 0
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mut start := 0
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for i < s.len {
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a := s[i] == delim
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b := i == s.len - 1
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if a || b {
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if i == s.len - 1 {
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i++
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}
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val := s.substr(start, i)
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if val.len > 0 {
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res << val.trim_space()
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}
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start = i + 1
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}
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i++
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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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last := i == s.len - 1
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if int(s[i]) == 10 || last {
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if last {
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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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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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pub 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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pub 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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// Because the string is immutable, it is safe for multiple strings to share
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// the same storage, so slicing s results in a new 2-word structure with a
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// potentially different pointer and length that still refers to the same byte
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// sequence. This means that slicing can be done without allocation or copying,
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// making string slices as efficient as passing around explicit indexes.
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// substr without allocations. Reuses memory and works great. BUT. This substring does not have
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// a \0 at the end, and it's not possible to add it. So if we have s = 'privet'
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// and substr := s.substr_fast(1, 4) ('riv')
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// puts(substr.str) will print 'rivet'
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// Avoid using C functions with these substrs!
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pub fn (s string) substr(start, end int) string {
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/*
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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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return ''
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}
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*/
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if start >= s.len {
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return ''
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}
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len := end - start
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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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return res
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}
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// KMP search
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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 -1
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}
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mut prefix := [0; p.len]
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mut j := 0
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for i := 1; i < p.len; i++ {
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for p[j] != p[i] && j > 0 {
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j = prefix[j - 1]
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}
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if p[j] == p[i] {
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j++
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}
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prefix[i] = j
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}
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j = 0
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for i := 0; i < s.len; i++ {
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for p[j] != s[i] && j > 0 {
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j = prefix[j - 1]
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}
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if p[j] == s[i] {
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j++
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}
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if j == p.len {
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prefix.free()
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return i - p.len + 1
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}
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}
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prefix.free()
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return -1
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}
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pub fn (s string) last_index(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 := s.len - p.len
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for i >= 0 {
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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_after(p string, start int) 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 strt := start
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if start < 0 {
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strt = 0
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}
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if start >= s.len {
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return -1
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}
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mut i := strt
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for i < s.len {
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mut j := 0
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mut ii := i
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for j < p.len && s[ii] == p[j] {
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j++
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ii++
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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) contains(p string) bool {
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res := s.index(p) > 0 - 1
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return res
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}
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pub fn (s string) starts_with(p string) bool {
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res := s.index(p) == 0
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return res
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}
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pub fn (s string) ends_with(p string) bool {
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if p.len > s.len {
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return false
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}
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res := s.last_index(p) == s.len - p.len
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return res
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}
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// TODO only works with ASCII
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pub fn (s string) to_lower() string {
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mut b := malloc(s.len)// TODO + 1 ??
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for i := 0; i < s.len; i++ {
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b[i] = C.tolower(s.str[i])
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}
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return tos(b, s.len)
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}
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pub fn (s string) to_upper() string {
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mut b := malloc(s.len)// TODO + 1 ??
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for i := 0; i < s.len; i++ {
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b[i] = C.toupper(s.str[i])
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}
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return tos(b, s.len)
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}
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// 'hey [man] how you doin'
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// find_between('[', ']') == 'man'
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pub fn (s string) find_between(start, end string) string {
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start_pos := s.index(start)
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if start_pos == -1 {
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return ''
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}
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// First get everything to the right of 'start'
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val := s.right(start_pos + start.len)
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end_pos := val.index(end)
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if end_pos == -1 {
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return val
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}
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return val.left(end_pos)
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}
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// TODO generic
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pub fn (ar []string) contains(val string) bool {
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for s in ar {
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if s == val {
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return true
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}
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}
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return false
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}
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// TODO generic
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pub fn (ar []int) contains(val int) bool {
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for i, s in ar {
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if s == val {
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return true
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}
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}
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return false
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}
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/*
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pub fn (a []string) to_c() voidptr {
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char ** res = malloc(sizeof(char*) * a.len);
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for i := 0; i < a.len; i++ {
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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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return 0
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}
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*/
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fn is_space(c byte) bool {
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return C.isspace(c)
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}
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pub fn (c byte) is_space() bool {
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return is_space(c)
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}
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pub fn (s string) trim_space() string {
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if s == '' {
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return ''
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}
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// println('TRIM SPACE "$s"')
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mut i := 0
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for i < s.len && is_space(s[i]) {
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i++
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}
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mut res := s.right(i)
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mut end := res.len - 1
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for end >= 0 && is_space(res[end]) {
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// C.printf('end=%d c=%d %c\n', end, res.str[end])
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end--
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}
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res = res.left(end + 1)
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// println('after SPACE "$res"')
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return res
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}
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pub fn (s string) trim(c byte) string {
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if s == '' {
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return ''
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}
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mut i := 0
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for i < s.len && c == s[i] {
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i++
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}
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mut res := s.right(i)
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mut end := res.len - 1
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for end >= 0 && c == res[end] {
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end--
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}
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res = res.left(end + 1)
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return res
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}
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pub fn (s string) trim_left(cutset string) string {
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mut start := s.index(cutset)
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if start != 0 {
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return s
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}
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for start < s.len - 1 && s[start] == cutset[0] {
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start++
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}
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return s.right(start)
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}
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pub fn (s string) trim_right(cutset string) string {
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pos := s.last_index(cutset)
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if pos == -1 {
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return s
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}
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return s.left(pos)
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}
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// fn print_cur_thread() {
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// //C.printf("tid = %08x \n", pthread_self());
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// }
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fn compare_strings(a, b *string) int {
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if a.lt(b) {
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return -1
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}
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if a.gt(b) {
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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 compare_strings_by_len(a, b *string) int {
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if a.len < b.len {
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return -1
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}
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if a.len > b.len {
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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 compare_lower_strings(a, b *string) int {
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aa := a.to_lower()
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|
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 {
|
|
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) substr(start, end int) string {
|
|
start = u.runes[start]
|
|
if end >= u.runes.len {
|
|
end = u.s.len
|
|
}
|
|
else {
|
|
end = u.runes[end]
|
|
}
|
|
return u.s.substr(start, end)
|
|
}
|
|
|
|
fn (u ustring) left(pos int) string {
|
|
return u.substr(0, pos)
|
|
}
|
|
|
|
fn (u ustring) right(pos int) string {
|
|
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 {
|
|
return u.substr(idx, idx + 1)
|
|
}
|
|
|
|
fn (u ustring) free() {
|
|
u.runes.free()
|
|
}
|
|
|
|
fn abs(a int) int {
|
|
if a >= 0 {
|
|
return a
|
|
}
|
|
return -a
|
|
}
|
|
|
|
pub fn (c byte) is_digit() bool {
|
|
return c >= `0` && c <= `9`
|
|
}
|
|
|
|
pub fn (c byte) is_letter() bool {
|
|
return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`)
|
|
}
|
|
|
|
pub fn (s string) free() {
|
|
C.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)
|
|
if pos == -1 {
|
|
return s
|
|
}
|
|
return s.left(pos)
|
|
}
|
|
|
|
pub fn (s string) all_before_last(dot string) string {
|
|
pos := s.last_index(dot)
|
|
if pos == -1 {
|
|
return s
|
|
}
|
|
return s.left(pos)
|
|
}
|
|
|
|
pub fn (s string) all_after(dot string) string {
|
|
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))
|
|
// }
|
|
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')
|
|
}
|
|
|
|
pub fn (s string) reverse() string {
|
|
mut res := string {
|
|
len: s.len
|
|
str: malloc(s.len + 1)
|
|
}
|
|
|
|
for i := s.len - 1; i >= 0; i-- {
|
|
res[s.len-i-1] = s[i]
|
|
}
|
|
|
|
return res
|
|
}
|
|
|
|
// '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 hash := int(0)
|
|
for i := 0; i < s.len; i++ {
|
|
// if key == 'Content-Type' {
|
|
// println('$i) $hash')
|
|
// }
|
|
hash = hash * int(31) + int(s.str[i])
|
|
}
|
|
return hash
|
|
}
|
|
|