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80 lines
2.9 KiB
Zig
80 lines
2.9 KiB
Zig
const std = @import("std");
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const oni = @import("oniguruma");
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/// Default URL regex. This is used to detect URLs in terminal output.
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/// This is here in the config package because one day the matchers will be
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/// configurable and this will be a default.
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///
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/// This is adapted from a regex used in the Alacritty project.
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///
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/// This regex is liberal in what it accepts after the scheme, with exceptions
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/// for URLs ending with . or ). Although such URLs are perfectly valid, it is
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/// common for text to contain URLs surrounded by parentheses (such as in
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/// Markdown links) or at the end of sentences. Therefore, this regex excludes
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/// them as follows:
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///
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/// 1. Do not match regexes ending with .
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/// 2. Do not match regexes ending with ), except for ones which contain a (
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/// without a subsequent )
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///
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/// Rule 2 means that that we handle the following two cases:
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///
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/// "https://en.wikipedia.org/wiki/Rust_(video_game)" (include parens)
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/// "(https://example.com)" (do not include the parens)
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///
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/// There are many complicated cases where these heuristics break down, but
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/// handling them well requires a non-regex approach.
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pub const regex = "(?:" ++ url_scheme ++ ")(?:[^" ++ url_exclude ++ "]*[^" ++ url_exclude ++ ").]|[^" ++ url_exclude ++ "(]*\\([^" ++ url_exclude ++ ")]*\\))";
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const url_scheme = "ipfs:|ipns:|magnet:|mailto:|gemini://|gopher://|https://|http://|news:|file:|git://|ssh:|ftp://";
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const url_exclude = "\u{0000}-\u{001F}\u{007F}-\u{009F}<>\x22\\s{-}\\^⟨⟩\x60";
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test "url regex" {
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const testing = std.testing;
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try oni.testing.ensureInit();
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var re = try oni.Regex.init(
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regex,
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.{ .find_longest = true },
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oni.Encoding.utf8,
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oni.Syntax.default,
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null,
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);
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defer re.deinit();
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// The URL cases to test what our regex matches. Feel free to add to this
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// as we find bugs or just want more coverage.
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const cases = [_]struct {
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input: []const u8,
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expect: []const u8,
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}{
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.{
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.input = "hello https://example.com world",
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.expect = "https://example.com",
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},
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.{
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.input = "https://example.com/foo(bar) more",
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.expect = "https://example.com/foo(bar)",
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},
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.{
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.input = "https://example.com/foo(bar)baz more",
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.expect = "https://example.com/foo(bar)baz",
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},
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.{
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.input = "Link inside (https://example.com) parens",
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.expect = "https://example.com",
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},
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.{
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.input = "Link period https://example.com. More text.",
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.expect = "https://example.com",
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},
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};
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for (cases) |case| {
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var reg = try re.search(case.input, .{});
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defer reg.deinit();
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try testing.expectEqual(@as(usize, 1), reg.count());
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const match = case.input[@intCast(reg.starts()[0])..@intCast(reg.ends()[0])];
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try testing.expectEqualStrings(case.expect, match);
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}
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}
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