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// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use url::Url;
// See https://tools.ietf.org/html/rfc3987#page-13
const URL_SEPARATOR_CHARS: [char; 10] = ['<', '>', '"', ' ', '{', '}', '|', '\\', '^', '`'];
const URL_DENY_END_CHARS: [char; 8] = ['.', ',', ';', ':', '?', '!', '/', '('];
const URL_SCHEMES: [&str; 8] = [
"http", "https", "mailto", "news", "file", "git", "ssh", "ftp",
];
// Parser for streaming inside-out detection of URLs.
pub struct UrlParser {
state: String,
}
impl UrlParser {
pub fn new() -> Self {
UrlParser {
state: String::new(),
}
}
/// Advance the parser one character to the left.
pub fn advance_left(&mut self, c: char) -> bool {
self.advance(c, 0)
}
/// Advance the parser one character to the right.
pub fn advance_right(&mut self, c: char) -> bool {
self.advance(c, self.state.len())
}
/// Returns the URL if the parser has found any.
pub fn url(mut self) -> Option<String> {
// Remove non-alphabetical characters before the scheme
// https://tools.ietf.org/html/rfc3986#section-3.1
if let Some(index) = self.state.find("://") {
let iter = self
.state
.char_indices()
.rev()
.skip_while(|(byte_index, _)| *byte_index >= index);
for (byte_index, c) in iter {
match c {
'a'...'z' | 'A'...'Z' => (),
_ => {
self.state = self.state.split_off(byte_index + c.len_utf8());
break;
}
}
}
}
// Remove non-matching parenthesis and brackets
let mut open_parens_count: isize = 0;
let mut open_bracks_count: isize = 0;
for (i, c) in self.state.chars().enumerate() {
match c {
'(' => open_parens_count += 1,
')' if open_parens_count > 0 => open_parens_count -= 1,
'[' => open_bracks_count += 1,
']' if open_bracks_count > 0 => open_bracks_count -= 1,
')' | ']' => {
self.state.truncate(i);
break;
}
_ => (),
}
}
// Track number of quotes
let mut num_quotes = self.state.chars().filter(|&c| c == '\'').count();
// Remove all characters which aren't allowed at the end of a URL
while !self.state.is_empty()
&& (URL_DENY_END_CHARS.contains(&self.state.chars().last().unwrap())
|| (num_quotes % 2 != 0 && self.state.ends_with('\''))
|| self.state.ends_with("''")
|| self.state.ends_with("()"))
{
if self.state.pop().unwrap() == '\'' {
num_quotes -= 1;
}
}
// Check if string is valid url
match Url::parse(&self.state) {
Ok(url) => {
if URL_SCHEMES.contains(&url.scheme()) {
Some(self.state)
} else {
None
}
}
Err(_) => None,
}
}
fn advance(&mut self, c: char, pos: usize) -> bool {
if URL_SEPARATOR_CHARS.contains(&c)
|| (c >= '\u{00}' && c <= '\u{1F}')
|| (c >= '\u{7F}' && c <= '\u{9F}')
{
true
} else {
self.state.insert(pos, c);
false
}
}
}
#[cfg(test)]
mod tests {
use std::mem;
use crate::grid::Grid;
use crate::index::{Column, Line, Point};
use crate::term::{Cell, Search, SizeInfo, Term};
fn url_create_term(input: &str) -> Term {
let size = SizeInfo {
width: 21.0,
height: 51.0,
cell_width: 3.0,
cell_height: 3.0,
padding_x: 0.0,
padding_y: 0.0,
dpr: 1.0,
};
let mut term = Term::new(&Default::default(), size);
let mut grid: Grid<Cell> = Grid::new(Line(1), Column(input.len()), 0, Cell::default());
for (i, c) in input.chars().enumerate() {
grid[Line(0)][Column(i)].c = c;
}
mem::swap(term.grid_mut(), &mut grid);
term
}
fn url_test(input: &str, expected: &str, click_index: usize) {
let term = url_create_term(input);
let url = term.url_search(Point::new(0, Column(click_index)));
assert_eq!(url, Some(expected.into()));
}
#[test]
fn url_skip_invalid() {
let term = url_create_term("no url here");
let url = term.url_search(Point::new(0, Column(4)));
assert_eq!(url, None);
}
#[test]
fn url_matching_chars() {
url_test("(https://example.org/test(ing))", "https://example.org/test(ing)", 5);
url_test("https://example.org/test(ing)", "https://example.org/test(ing)", 5);
url_test("((https://example.org))", "https://example.org", 5);
url_test(")https://example.org(", "https://example.org", 5);
url_test("https://example.org)", "https://example.org", 5);
url_test("https://example.org(", "https://example.org", 5);
url_test("(https://one.org/)(https://two.org/)", "https://one.org", 5);
url_test("https://[2001:db8:a0b:12f0::1]:80", "https://[2001:db8:a0b:12f0::1]:80", 5);
url_test("([(https://example.org/test(ing))])", "https://example.org/test(ing)", 5);
url_test("https://example.org/]()", "https://example.org", 5);
url_test("[https://example.org]", "https://example.org", 5);
url_test("'https://example.org/test'ing'''", "https://example.org/test'ing'", 5);
url_test("https://example.org/test'ing'", "https://example.org/test'ing'", 5);
url_test("'https://example.org'", "https://example.org", 5);
url_test("'https://example.org", "https://example.org", 5);
url_test("https://example.org'", "https://example.org", 5);
}
#[test]
fn url_detect_end() {
url_test("https://example.org/test\u{00}ing", "https://example.org/test", 5);
url_test("https://example.org/test\u{1F}ing", "https://example.org/test", 5);
url_test("https://example.org/test\u{7F}ing", "https://example.org/test", 5);
url_test("https://example.org/test\u{9F}ing", "https://example.org/test", 5);
url_test("https://example.org/test\ting", "https://example.org/test", 5);
url_test("https://example.org/test ing", "https://example.org/test", 5);
}
#[test]
fn url_remove_end_chars() {
url_test("https://example.org/test?ing", "https://example.org/test?ing", 5);
url_test("https://example.org.,;:)'!/?", "https://example.org", 5);
url_test("https://example.org'.", "https://example.org", 5);
}
#[test]
fn url_remove_start_chars() {
url_test("complicated:https://example.org", "https://example.org", 15);
url_test("test.https://example.org", "https://example.org", 10);
url_test(",https://example.org", "https://example.org", 5);
url_test("\u{2502}https://example.org", "https://example.org", 5);
}
#[test]
fn url_unicode() {
url_test("https://xn--example-2b07f.org", "https://xn--example-2b07f.org", 5);
url_test("https://example.org/\u{2008A}", "https://example.org/\u{2008A}", 5);
url_test("https://example.org/\u{f17c}", "https://example.org/\u{f17c}", 5);
url_test("https://üñîçøðé.com/ä", "https://üñîçøðé.com/ä", 5);
}
#[test]
fn url_schemes() {
url_test("mailto://example.org", "mailto://example.org", 5);
url_test("https://example.org", "https://example.org", 5);
url_test("http://example.org", "http://example.org", 5);
url_test("news://example.org", "news://example.org", 5);
url_test("file://example.org", "file://example.org", 5);
url_test("git://example.org", "git://example.org", 5);
url_test("ssh://example.org", "ssh://example.org", 5);
url_test("ftp://example.org", "ftp://example.org", 5);
}
}
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