mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
80 lines
2.7 KiB
V
80 lines
2.7 KiB
V
/**********************************************************************
|
|
* regex samples
|
|
*
|
|
* Copyright (c) 2019-2020 Dario Deledda. All rights reserved.
|
|
* Use of this source code is governed by an MIT license
|
|
* that can be found in the LICENSE file.
|
|
*
|
|
* This file contains a collection of regex samples
|
|
*
|
|
**********************************************************************/
|
|
import regex
|
|
|
|
/*
|
|
This simple function convert an HTML RGB value with 3 or 6 hex digits to an u32 value,
|
|
this function is not optimized and it si only for didatical purpose
|
|
example: #A0B0CC #A9F
|
|
*/
|
|
fn convert_html_rgb(in_col string) u32 {
|
|
mut n_digit := if in_col.len == 4 { 1 } else { 2 }
|
|
mut col_mul := if in_col.len == 4 { 4 } else { 0 }
|
|
|
|
// this is the regex query, it use the V string interpolation to customize the regex query
|
|
// NOTE: if you want use escaped code you must use the r"" (raw) strings,
|
|
// *** please remember that the V interpoaltion doesn't work on raw strings. ***
|
|
|
|
query:= "#([a-fA-F0-9]{$n_digit})([a-fA-F0-9]{$n_digit})([a-fA-F0-9]{$n_digit})"
|
|
|
|
mut re := regex.regex_opt(query) or { panic(err) }
|
|
start, end := re.match_string(in_col)
|
|
println("start: $start, end: $end")
|
|
mut res := u32(0)
|
|
if start >= 0 {
|
|
group_list := re.get_group_list()
|
|
r := ("0x" + in_col[group_list[0].start..group_list[0].end]).int() << col_mul
|
|
g := ("0x" + in_col[group_list[1].start..group_list[1].end]).int() << col_mul
|
|
b := ("0x" + in_col[group_list[2].start..group_list[2].end]).int() << col_mul
|
|
println("r: $r g: $g b: $b")
|
|
res = u32(r) << 16 | u32(g) << 8 | u32(b)
|
|
}
|
|
return res
|
|
}
|
|
|
|
/*
|
|
This function demostrate the use of the named groups
|
|
*/
|
|
fn convert_html_rgb_n(in_col string) u32 {
|
|
mut n_digit := if in_col.len == 4 { 1 } else { 2 }
|
|
mut col_mul := if in_col.len == 4 { 4 } else { 0 }
|
|
|
|
query:= "#(?P<red>[a-fA-F0-9]{$n_digit})(?P<green>[a-fA-F0-9]{$n_digit})(?P<blue>[a-fA-F0-9]{$n_digit})"
|
|
|
|
mut re := regex.regex_opt(query) or { panic(err) }
|
|
start, end := re.match_string(in_col)
|
|
println("start: $start, end: $end")
|
|
mut res := u32(0)
|
|
if start >= 0 {
|
|
red_s, red_e := re.get_group_bounds_by_name("red")
|
|
r := ("0x" + in_col[red_s..red_e]).int() << col_mul
|
|
|
|
green_s, green_e := re.get_group_bounds_by_name("green")
|
|
g := ("0x" + in_col[green_s..green_e]).int() << col_mul
|
|
|
|
blue_s, blue_e := re.get_group_bounds_by_name("blue")
|
|
b := ("0x" + in_col[blue_s..blue_e]).int() << col_mul
|
|
|
|
println("r: $r g: $g b: $b")
|
|
res = u32(r) << 16 | u32(g) << 8 | u32(b)
|
|
}
|
|
return res
|
|
}
|
|
|
|
fn main() {
|
|
// convert HTML rgb color usign groups
|
|
println(convert_html_rgb("#A0b0Cc").hex())
|
|
println(convert_html_rgb("#ABC").hex())
|
|
|
|
// convert HTML rgb color using maned groups
|
|
println(convert_html_rgb_n("#A0B0CC").hex())
|
|
println(convert_html_rgb_n("#ABC").hex())
|
|
} |