Basic implementation of the parser for the title of the link, does not pass the test with nested brackets

src/lib.rs

@@ -73,7 +73,11 @@ extern crate rustc_serialize;
 extern crate handlebars;
 extern crate pulldown_cmark;
 
-#[macro_use] pub mod macros;
+#[macro_use]
+extern crate nom;
+
+#[macro_use]
+pub mod macros;
 pub mod book;
 mod parse;
 pub mod renderer;

src/parse/nom.rs

@@ -1,6 +1,7 @@
-extern crate nom;
+use nom::{self, IResult, alphanumeric};
 
-use self::nom::IResult;
+use std::str;
+use std::str::FromStr;
 
 #[derive(Debug, Clone)]
 struct Link {
@@ -23,9 +24,48 @@ fn link(i: &[u8]) -> IResult<&[u8], Link> {
 /// Parser for parsing the title part of the link: [title](destination)
 ///                                                ^^^^^^^
 fn link_text(i: &[u8]) -> IResult<&[u8], String> {
-    unimplemented!();
+    map_res!(i, map_res!(delimited!(char!('['), is_not!("[]"), char!(']')), str::from_utf8), FromStr::from_str)
 }
 
+/// Parser for parsing the destination part of the link: [title](destination)
+///                                                             ^^^^^^^^^^^^^
 fn link_destination(i: &[u8]) -> IResult<&[u8], String> {
     unimplemented!();
 }
+
+#[cfg(test)]
+mod tests {
+
+    use nom::{self, IResult};
+
+    // Tests for link_text
+
+    #[test]
+    fn link_text_one_ch() {
+        assert_eq!(super::link_text(b"[a]"), nom::IResult::Done(&b""[..], String::from("a")));
+    }
+
+    #[test]
+    fn link_text_multi_ch() {
+        assert_eq!(super::link_text(b"[Intro]"), nom::IResult::Done(&b""[..], String::from("Intro")));
+    }
+
+    #[test]
+    fn link_text_sp_ch() {
+        assert_eq!(super::link_text(b"[Intro!]"), nom::IResult::Done(&b""[..], String::from("Intro!")));
+    }
+
+    #[test]
+    fn link_text_unicode() {
+        assert_eq!(super::link_text("[Heizölrückstoßabdämpfung]".as_bytes()),
+                   nom::IResult::Done(&b""[..], String::from("Heizölrückstoßabdämpfung")));
+        assert_eq!(super::link_text("[Здравствуйте]".as_bytes()),
+                   nom::IResult::Done(&b""[..], String::from("Здравствуйте")));
+    }
+
+    #[test]
+    fn link_text_brackets() {
+        assert_eq!(super::link_text(b"[Intro[]]"), nom::IResult::Done(&b""[..], String::from("Intro[]")));
+        assert_eq!(super::link_text(br"[Intro\[]"), nom::IResult::Done(&b""[..], String::from("Intro[")));
+    }
+}