Add link, images (resource)

This is still some messy code that needs cleaning up, but it adds support for
links and images, of the resource kind (`[a](b)`).
References (`[a][b]`) are parsed and will soon be supported, but need matching.

*   Fix bug to pad percent-encoded bytes when normalizing urls
*   Fix bug with escapes counting as balancing in destination
*   Add `space_or_tab_one_line_ending`, to parse whitespace including up to
    one line ending (but not a blank line)
*   Add `ParserState` to share codes, definitions, etc

1 files changed, 51 insertions, 56 deletions

diff --git a/tests/misc_url.rs b/tests/misc_url.rs
index a6f8ead..5e94366 100644
--- a/tests/misc_url.rs
+++ b/tests/misc_url.rs
@@ -9,28 +9,25 @@ fn url() {
         "should support incorrect percentage encoded values (0)"
     );
 
-    // To do: link.
-    // assert_eq!(
-    //     micromark("[](<%>)"),
-    //     "<p><a href=\"%25\"></a></p>",
-    //     "should support incorrect percentage encoded values (1)"
-    // );
-
-    // To do: link.
-    // assert_eq!(
-    //     micromark("[](<%%20>)"),
-    //     "<p><a href=\"%25%20\"></a></p>",
-    //     "should support incorrect percentage encoded values (2)"
-    // );
-
-    // To do: link.
-    // assert_eq!(
-    //     micromark("[](<%a%20>)"),
-    //     "<p><a href=\"%25a%20\"></a></p>",
-    //     "should support incorrect percentage encoded values (3)"
-    // );
+    assert_eq!(
+        micromark("[](<%>)"),
+        "<p><a href=\"%25\"></a></p>",
+        "should support incorrect percentage encoded values (1)"
+    );
 
-    // Surrogate handling not needed in Rust.
+    assert_eq!(
+        micromark("[](<%%20>)"),
+        "<p><a href=\"%25%20\"></a></p>",
+        "should support incorrect percentage encoded values (2)"
+    );
+
+    assert_eq!(
+        micromark("[](<%a%20>)"),
+        "<p><a href=\"%25a%20\"></a></p>",
+        "should support incorrect percentage encoded values (3)"
+    );
+
+    // Note: Surrogate handling not needed in Rust.
     //   assert_eq!(
     //     micromark("[](<foo\u{D800}bar>)"),
     //     "<p><a href=\"foo%EF%BF%BDbar\"></a></p>",
@@ -114,39 +111,37 @@ fn url() {
     //     "should support a lone low surrogate at the end (highest)"
     //   );
 
-    // To do: link.
-    // assert_eq!(
-    //     micromark("[](<🤔>)"),
-    //     "<p><a href=\"%F0%9F%A4%94\"></a></p>",
-    //     "should support an emoji"
-    // );
-
-    // To do: link.
-    // let mut ascii: Vec<char> = vec![];
-    // let mut code = 0;
-
-    // while code < 128 {
-    //     // LF and CR can’t be in resources.
-    //     if code == 10 || code == 13 {
-    //         code += 1;
-    //         continue;
-    //     }
-
-    //     // `<`, `>`, `\` need to be escaped.
-    //     if code == 60 || code == 62 || code == 92 {
-    //         ascii.push('\\');
-    //     }
-
-    //     ascii.push(char::from_u32(code).unwrap());
-
-    //     code += 1;
-    // }
-
-    // let ascii_in = ascii.into_iter().collect::<String>();
-    // let ascii_out = "%EF%BF%BD%01%02%03%04%05%06%07%08%09%0B%0C%0E%0F%10%11%12%13%14%15%16%17%18%19%1A%1B%1C%1D%1E%1F%20!%22#$%25&amp;\"()*+,-./0123456789:;%3C=%3E?@ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D~%7F";
-    // assert_eq!(
-    //     micromark(&format!("[](<{}>)", ascii_in)),
-    //     format!("<p><a href=\"{}\"></a></p>", ascii_out),
-    //     "should support ascii characters"
-    // );
+    assert_eq!(
+        micromark("[](<🤔>)"),
+        "<p><a href=\"%F0%9F%A4%94\"></a></p>",
+        "should support an emoji"
+    );
+
+    let mut ascii: Vec<char> = vec![];
+    let mut code = 0;
+
+    while code < 128 {
+        // LF and CR can’t be in resources.
+        if code == 10 || code == 13 {
+            code += 1;
+            continue;
+        }
+
+        // `<`, `>`, `\` need to be escaped.
+        if code == 60 || code == 62 || code == 92 {
+            ascii.push('\\');
+        }
+
+        ascii.push(char::from_u32(code).unwrap());
+
+        code += 1;
+    }
+
+    let ascii_in = ascii.into_iter().collect::<String>();
+    let ascii_out = "%EF%BF%BD%01%02%03%04%05%06%07%08%09%0B%0C%0E%0F%10%11%12%13%14%15%16%17%18%19%1A%1B%1C%1D%1E%1F%20!%22#$%25&amp;'()*+,-./0123456789:;%3C=%3E?@ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D~%7F";
+    assert_eq!(
+        micromark(&format!("[](<{}>)", ascii_in)),
+        format!("<p><a href=\"{}\"></a></p>", ascii_out),
+        "should support ascii characters"
+    );
 }