1 files changed, 402 insertions, 0 deletions
diff --git a/tests/link_reference.rs b/tests/link_reference.rs
new file mode 100644
index 0000000..cac1b39
--- /dev/null
+++ b/tests/link_reference.rs
@@ -0,0 +1,402 @@
+extern crate micromark;
+use micromark::{micromark, micromark_with_options, Options};
+
+const DANGER: &Options = &Options {
+    allow_dangerous_html: true,
+    allow_dangerous_protocol: true,
+    default_line_ending: None,
+};
+
+#[test]
+fn link_reference() {
+    assert_eq!(
+        micromark("[bar]: /url \"title\"\n\n[foo][bar]"),
+        "<p><a href=\"/url\" title=\"title\">foo</a></p>",
+        "should support link references"
+    );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n[link [foo [bar]]][ref]"),
+        "<p><a href=\"/uri\">link [foo [bar]]</a></p>",
+        "should support balanced brackets in link references"
+    );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n[link \\[bar][ref]"),
+        "<p><a href=\"/uri\">link [bar</a></p>",
+        "should support escaped brackets in link references"
+    );
+
+    // To do: attention.
+    // assert_eq!(
+    //     micromark("[ref]: /uri\n\n[link *foo **bar** `#`*][ref]"),
+    //     "<p><a href=\"/uri\">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>",
+    //     "should support content in link references"
+    // );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n[![moon](moon.jpg)][ref]"),
+        "<p><a href=\"/uri\"><img src=\"moon.jpg\" alt=\"moon\" /></a></p>",
+        "should support images in link references"
+    );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n[foo [bar](/uri)][ref]"),
+        "<p>[foo <a href=\"/uri\">bar</a>]<a href=\"/uri\">ref</a></p>",
+        "should not support links in link references"
+    );
+
+    // To do: attention.
+    // assert_eq!(
+    //     micromark("[ref]: /uri\n\n[foo *bar [baz][ref]*][ref]"),
+    //     "<p>[foo <em>bar <a href=\"/uri\">baz</a></em>]<a href=\"/uri\">ref</a></p>",
+    //     "should not support deep links in link references"
+    // );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n*[foo*][ref]"),
+        "<p>*<a href=\"/uri\">foo*</a></p>",
+        "should prefer link references over emphasis (1)"
+    );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n[foo *bar][ref]"),
+        "<p><a href=\"/uri\">foo *bar</a></p>",
+        "should prefer link references over emphasis (2)"
+    );
+
+    assert_eq!(
+        micromark_with_options("[ref]: /uri\n\n[foo <bar attr=\"][ref]\">", &DANGER),
+        "<p>[foo <bar attr=\"][ref]\"></p>",
+        "should prefer HTML over link references"
+    );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n[foo`][ref]`"),
+        "<p>[foo<code>][ref]</code></p>",
+        "should prefer code over link references"
+    );
+
+    assert_eq!(
+        micromark("[ref]: /uri\n\n[foo<http://example.com/?search=][ref]>"),
+        "<p>[foo<a href=\"http://example.com/?search=%5D%5Bref%5D\">http://example.com/?search=][ref]</a></p>",
+        "should prefer autolinks over link references"
+    );
+
+    assert_eq!(
+        micromark("[bar]: /url \"title\"\n\n[foo][BaR]"),
+        "<p><a href=\"/url\" title=\"title\">foo</a></p>",
+        "should match references to definitions case-insensitively"
+    );
+
+    assert_eq!(
+        micromark("[ТОЛПОЙ]: /url\n\n[Толпой][Толпой] is a Russian word."),
+        "<p><a href=\"/url\">Толпой</a> is a Russian word.</p>",
+        "should match references to definitions w/ unicode case-folding"
+    );
+
+    assert_eq!(
+        micromark("[Foo\n  bar]: /url\n\n[Baz][Foo bar]"),
+        "<p><a href=\"/url\">Baz</a></p>",
+        "should match references to definitions w/ collapsing"
+    );
+
+    assert_eq!(
+        micromark("[bar]: /url \"title\"\n\n[foo] [bar]"),
+        "<p>[foo] <a href=\"/url\" title=\"title\">bar</a></p>",
+        "should not support whitespace between label and reference (1)"
+    );
+
+    assert_eq!(
+        micromark("[bar]: /url \"title\"\n\n[foo]\n[bar]"),
+        "<p>[foo]\n<a href=\"/url\" title=\"title\">bar</a></p>",
+        "should not support whitespace between label and reference (2)"
+    );
+
+    assert_eq!(
+        micromark("[foo]: /url1\n\n[foo]: /url2\n\n[bar][foo]"),
+        "<p><a href=\"/url1\">bar</a></p>",
+        "should prefer earlier definitions"
+    );
+
+    assert_eq!(
+        micromark("[foo!]: /url\n\n[bar][foo\\!]"),
+        "<p>[bar][foo!]</p>",
+        "should not match references to definitions w/ escapes"
+    );
+
+    assert_eq!(
+        micromark("[ref[]: /uri\n\n[foo][ref[]"),
+        "<p>[ref[]: /uri</p>\n<p>[foo][ref[]</p>",
+        "should not support references w/ brackets (1)"
+    );
+
+    assert_eq!(
+        micromark("[ref[bar]]: /uri\n\n[foo][ref[bar]]"),
+        "<p>[ref[bar]]: /uri</p>\n<p>[foo][ref[bar]]</p>",
+        "should not support references w/ brackets (2)"
+    );
+
+    assert_eq!(
+        micromark("[[[foo]]]: /url\n\n[[[foo]]]"),
+        "<p>[[[foo]]]: /url</p>\n<p>[[[foo]]]</p>",
+        "should not support references w/ brackets (3)"
+    );
+
+    assert_eq!(
+        micromark("[ref\\[]: /uri\n\n[foo][ref\\[]"),
+        "<p><a href=\"/uri\">foo</a></p>",
+        "should match references to definitions w/ matching escapes"
+    );
+
+    assert_eq!(
+        micromark("[bar\\\\]: /uri\n\n[bar\\\\]"),
+        "<p><a href=\"/uri\">bar\\</a></p>",
+        "should support escapes"
+    );
+
+    assert_eq!(
+        micromark("[]: /uri\n\n[]"),
+        "<p>[]: /uri</p>\n<p>[]</p>",
+        "should not support empty references"
+    );
+
+    // To do: trimming whitespace.
+    // assert_eq!(
+    //     micromark("[\n ]: /uri\n\n[\n ]"),
+    //     "<p>[\n]: /uri</p>\n<p>[\n]</p>",
+    //     "should not support blank references"
+    // );
+
+    assert_eq!(
+        micromark("[foo]: /url \"title\"\n\n[foo][]"),
+        "<p><a href=\"/url\" title=\"title\">foo</a></p>",
+        "should support collaped references"
+    );
+
+    // To do: attention.
+    // assert_eq!(
+    //     micromark("[*foo* bar]: /url \"title\"\n\n[*foo* bar][]"),
+    //     "<p><a href=\"/url\" title=\"title\"><em>foo</em> bar</a></p>",
+    //     "should support content in collaped references"
+    // );
+
+    assert_eq!(
+        micromark("[foo]: /url \"title\"\n\n[Foo][]"),
+        "<p><a href=\"/url\" title=\"title\">Foo</a></p>",
+        "should match references to definitions case-insensitively"
+    );
+
+    // To do: trimming whitespace.
+    // assert_eq!(
+    //     micromark("[foo]: /url \"title\"\n\n[foo] \n[]"),
+    //     "<p><a href=\"/url\" title=\"title\">foo</a>\n[]</p>",
+    //     "should not support whitespace between label and collaped reference"
+    // );
+
+    assert_eq!(
+        micromark("[foo]: /url \"title\"\n\n[foo]"),
+        "<p><a href=\"/url\" title=\"title\">foo</a></p>",
+        "should support shortcut references"
+    );
+
+    // To do: attention.
+    // assert_eq!(
+    //     micromark("[*foo* bar]: /url \"title\"\n\n[*foo* bar]"),
+    //     "<p><a href=\"/url\" title=\"title\"><em>foo</em> bar</a></p>",
+    //     "should support content in shortcut references (1)"
+    // );
+
+    // To do: attention.
+    // assert_eq!(
+    //     micromark("[*foo* bar]: /url \"title\"\n\n[[*foo* bar]]"),
+    //     "<p>[<a href=\"/url\" title=\"title\"><em>foo</em> bar</a>]</p>",
+    //     "should support content in shortcut references (2)"
+    // );
+
+    assert_eq!(
+        micromark("[foo]: /url\n\n[[bar [foo]"),
+        "<p>[[bar <a href=\"/url\">foo</a></p>",
+        "should support content in shortcut references (3)"
+    );
+
+    assert_eq!(
+        micromark("[foo]: /url \"title\"\n\n[Foo]"),
+        "<p><a href=\"/url\" title=\"title\">Foo</a></p>",
+        "should match shortcut references to definitions case-insensitively"
+    );
+
+    assert_eq!(
+        micromark("[foo]: /url\n\n[foo] bar"),
+        "<p><a href=\"/url\">foo</a> bar</p>",
+        "should support whitespace after a shortcut reference"
+    );
+
+    assert_eq!(
+        micromark("[foo]: /url \"title\"\n\n\\[foo]"),
+        "<p>[foo]</p>",
+        "should “support” an escaped shortcut reference"
+    );
+
+    assert_eq!(
+        micromark("[foo*]: /url\n\n*[foo*]"),
+        "<p>*<a href=\"/url\">foo*</a></p>",
+        "should prefer shortcut references over emphasis"
+    );
+
+    assert_eq!(
+        micromark("[foo]: /url1\n[bar]: /url2\n\n[foo][bar]"),
+        "<p><a href=\"/url2\">foo</a></p>",
+        "should prefer full references over shortcut references"
+    );
+
+    assert_eq!(
+        micromark("[foo]: /url1\n\n[foo][]"),
+        "<p><a href=\"/url1\">foo</a></p>",
+        "should prefer collapsed references over shortcut references"
+    );
+
+    // To do: some bug!
+    // assert_eq!(
+    //     micromark("[foo]: /url1\n\n[foo]()"),
+    //     "<p><a href=\"\">foo</a></p>",
+    //     "should prefer resources over shortcut references"
+    // );
+
+    assert_eq!(
+        micromark("[foo]: /url1\n\n[foo](not a link)"),
+        "<p><a href=\"/url1\">foo</a>(not a link)</p>",
+        "should support shortcut references when followed by nonconforming resources"
+    );
+
+    assert_eq!(
+        micromark("[baz]: /url\n\n[foo][bar][baz]"),
+        "<p>[foo]<a href=\"/url\">bar</a></p>",
+        "stable/unstable (1)"
+    );
+
+    assert_eq!(
+        micromark("[baz]: /url1\n[bar]: /url2\n\n[foo][bar][baz]"),
+        "<p><a href=\"/url2\">foo</a><a href=\"/url1\">baz</a></p>",
+        "stable/unstable (2)"
+    );
+
+    assert_eq!(
+        micromark("[baz]: /url1\n[foo]: /url2\n\n[foo][bar][baz]"),
+        "<p>[foo]<a href=\"/url1\">bar</a></p>",
+        "stable/unstable (3)"
+    );
+
+    // Extra
+    // This matches most implimentations, but is not strictly according to spec.
+    // See: <https://github.com/commonmark/commonmark-spec/issues/653>
+    assert_eq!(
+        micromark("[x]: /url\n\n[x][ ], [x][\t], [x][\n], [x][]"),
+        "<p>[x][ ], [x][\t], [x][\n], <a href=\"/url\">x</a></p>",
+        "should not support whitespace-only full references"
+    );
+
+    // See also: <https://github.com/commonmark/commonmark-spec/issues/616>
+    assert_eq!(
+        micromark("[+]: example.com\n[\\;]: example.com\n\nWill it link? [\\+], [;]"),
+        "<p>Will it link? [+], [;]</p>",
+        "should not support mismatched character escapes in shortcuts"
+    );
+
+    assert_eq!(
+        micromark("[©]: example.com\n[&amp;]: example.com\n\nWill it link? [&copy;], [&]"),
+        "<p>Will it link? [©], [&amp;]</p>",
+        "should not support mismatched character references in shortcuts"
+    );
+
+    assert_eq!(
+        micromark("[+]: example.com\n[\\;]: example.com\n\nWill it link? [\\+][], [;][]"),
+        "<p>Will it link? [+][], [;][]</p>",
+        "should not support mismatched character escapes in collapsed"
+    );
+
+    assert_eq!(
+        micromark("[©]: example.com\n[&amp;]: example.com\n\nWill it link? [&copy;][], [&][]"),
+        "<p>Will it link? [©][], [&amp;][]</p>",
+        "should not support mismatched character references in collapsed"
+    );
+
+    assert_eq!(
+        micromark("[+]: example.com\n[\\;]: example.com\n\nWill it link? [a][ \\+ ], [b][ ; ]"),
+        "<p>Will it link? [a][ + ], [b][ ; ]</p>",
+        "should not support mismatched character escapes in fulls"
+    );
+
+    assert_eq!(
+        micromark(
+            "[©]: example.com\n[&amp;]: example.com\n\nWill it link? [a][ &copy; ], [b][ & ]"
+        ),
+        "<p>Will it link? [a][ © ], [b][ &amp; ]</p>",
+        "should not support mismatched character references in fulls"
+    );
+
+    // To do: attention.
+    //     assert_eq!(
+    //         micromark(
+    //             "[*f*][]
+    // [&semi;][]
+    // [\\;][]
+    // [;][]
+    // [*f*&semi;][]
+    // [*f*\\;][]
+    // [*f*;][]
+
+    // [*f*]: alpha
+    // [&semi;]: bravo
+    // [\\;]: charlie
+    // [;]: delta
+    // [*f*&semi;]: echo
+    // [*f*\\;]: foxtrot
+    // [*f*;]: golf"
+    //         ),
+    //         "<p><a href=\"alpha\"><em>f</em></a>
+    // <a href=\"bravo\">;</a>
+    // <a href=\"charlie\">;</a>
+    // <a href=\"delta\">;</a>
+    // <a href=\"echo\"><em>f</em>;</a>
+    // <a href=\"foxtrot\"><em>f</em>;</a>
+    // <a href=\"golf\"><em>f</em>;</a></p>
+    // ",
+    //         "should properly handle labels w/ character references and -escapes, and phrasing"
+    //     );
+
+    // 999 `x` characters.
+    let max = "x".repeat(999);
+
+    assert_eq!(
+        micromark(format!("[{}]: a\n[y][{}]", max, max).as_str()),
+        "<p><a href=\"a\">y</a></p>",
+        "should support 999 characters in a reference"
+    );
+
+    assert_eq!(
+        micromark(format!("[{}x]: a\n[y][{}x]", max, max).as_str()),
+        format!("<p>[{}x]: a\n[y][{}x]</p>", max, max),
+        "should not support 1000 characters in a reference"
+    );
+
+    assert_eq!(
+        micromark("[x] missing-colon\n\nWill it link? [x]"),
+        "<p>[x] missing-colon</p>\n<p>Will it link? [x]</p>",
+        "should not fail on a missing colon in a definition"
+    );
+
+    // To do: turning things off.
+    // assert_eq!(
+    // micromark("[x]()", {extensions: [{disable: {null: ["labelStartLink"]}}]}),
+    // "<p>[x]()</p>",
+    // "should support turning off label start (link)"
+    // );
+
+    // To do: turning things off.
+    // assert_eq!(
+    // micromark("[x]()", {extensions: [{disable: {null: ["labelEnd"]}}]}),
+    // "<p>[x]()</p>",
+    // "should support turning off label end"
+    // );
+}