Allow advanced lookups in lookup and lookup_mut

src/lib.rs

@@ -181,12 +181,16 @@ impl Value {
     /// assert_eq!(no_bar.is_none(), true);
     /// ```
     pub fn lookup<'a>(&'a self, path: &'a str) -> Option<&'a Value> {
+        let ref path = match Parser::new(path).lookup() {
+            Some(path) => path,
+            None => return None,
+        };
         let mut cur_value = self;
         if path.len() == 0 {
             return Some(cur_value)
         }
 
-        for key in path.split('.') {
+        for key in path {
             match *cur_value {
                 Value::Table(ref hm) => {
                     match hm.get(key) {
@@ -205,8 +209,8 @@ impl Value {
         };
 
         Some(cur_value)
-    }
 
+    }
     /// Lookups for mutable value at specified path.
     ///
     /// Uses '.' as a path separator.
@@ -237,12 +241,17 @@ impl Value {
     /// assert_eq!(result.as_str().unwrap(), "foo");
     /// ```
     pub fn lookup_mut(&mut self, path: &str) -> Option<&mut Value> {
+       let ref path = match Parser::new(path).lookup() {
+            Some(path) => path,
+            None => return None,
+        };
+
         let mut cur = self;
         if path.len() == 0 {
             return Some(cur)
         }
 
-        for key in path.split('.') {
+        for key in path {
             let tmp = cur;
             match *tmp {
                 Value::Table(ref mut hm) => {
@@ -428,4 +437,56 @@ mod tests {
         let baz = foo.lookup("foo").unwrap();
         assert_eq!(baz.as_str().unwrap(), "bar");
     }
+
+    #[test]
+    fn lookup_advanced() {
+        let value: Value = "[table]\n\"value\" = 0".parse().unwrap();
+        let looked = value.lookup("table.\"value\"").unwrap();
+        assert_eq!(*looked, Value::Integer(0));
+    }
+
+    #[test]
+    fn lookup_advanced_table() {
+        let value: Value = r#"[table."name.other"] value = "my value""#.parse().unwrap();
+        let looked = value.lookup(r#"table."name.other".value"#).unwrap();
+        assert_eq!(*looked, Value::String(String::from("my value")));
+    }
+
+    #[test]
+    fn lookup_mut_advanced() {
+        let mut value: Value = "[table]\n\"value\" = [0, 1, 2]".parse().unwrap();
+        let looked = value.lookup_mut("table.\"value\".1").unwrap();
+        assert_eq!(*looked, Value::Integer(1));
+    }
+
+    #[test]
+    fn single_dot() {
+        let value: Value = "[table]\n\"value\" = [0, 1, 2]".parse().unwrap();
+        assert_eq!(None, value.lookup("."));
+    }
+
+    #[test]
+    fn array_dot() {
+        let value: Value = "[table]\n\"value\" = [0, 1, 2]".parse().unwrap();
+        assert_eq!(None, value.lookup("0."));
+    }
+
+    #[test]
+    fn dot_inside() {
+        let value: Value = "[table]\n\"value\" = [0, 1, 2]".parse().unwrap();
+        assert_eq!(None, value.lookup("table.\"value.0\""));
+    }
+
+    #[test]
+    fn table_with_quotes() {
+        let value: Value = "[table.\"element\"]\n\"value\" = [0, 1, 2]".parse().unwrap();
+        assert_eq!(None, value.lookup("\"table.element\".\"value\".0"));
+    }
+
+    #[test]
+    fn table_with_quotes_2() {
+        let value: Value = "[table.\"element\"]\n\"value\" = [0, 1, 2]".parse().unwrap();
+        assert_eq!(Value::Integer(0), *value.lookup("table.\"element\".\"value\".0").unwrap());
+    }
+
 }

src/parser.rs

@@ -290,6 +290,31 @@ impl<'a> Parser<'a> {
         }
     }
 
+    // Parse an array index as a natural number
+    fn array_index(&mut self) -> Option<String> {
+        self.integer(0, false, false)
+    }
+
+    /// Parse a path into a vector of paths
+    pub fn lookup(&mut self) -> Option<Vec<String>> {
+        if self.input.len() == 0 {
+            return Some(vec![]);
+        }
+        let mut keys = Vec::new();
+        loop {
+            self.ws();
+            if let Some(s) = self.key_name() {
+                keys.push(s);
+            } else if let Some(s) = self.array_index() {
+                keys.push(s);
+            } else {
+                return None
+            }
+            self.ws();
+            if !self.expect('.') { return Some(keys) }
+        }
+    }
+
     // Parse a single key name starting at `start`
     fn key_name(&mut self) -> Option<String> {
         let start = self.next_pos();
@@ -969,6 +994,42 @@ mod tests {
         })
     }
 
+    #[test]
+    fn lookup_internal() {
+        let mut parser = Parser::new(r#"hello."world\t".a.0.'escaped'.value"#);
+        let result = vec![
+          String::from("hello"),
+          String::from("world\t"),
+          String::from("a"),
+          String::from("0"),
+          String::from("escaped"),
+          String::from("value")
+        ];
+
+        assert_eq!(parser.lookup().unwrap(), result);
+    }
+
+    #[test]
+    fn lookup_internal_void() {
+        let mut parser = Parser::new("");
+        assert_eq!(parser.lookup().unwrap(), Vec::<String>::new());
+    }
+
+    #[test]
+    fn lookup_internal_simple() {
+        let mut parser = Parser::new("value");
+        assert_eq!(parser.lookup().unwrap(), vec![String::from("value")]);
+    }
+
+    // This is due to key_name not parsing an empty "" correctly. Disabled for now.
+    #[test]
+    #[ignore]
+    fn lookup_internal_quoted_void() {
+        let mut parser = Parser::new("\"\"");
+        assert_eq!(parser.lookup().unwrap(), vec![String::from("")]);
+    }
+
+
     #[test]
     fn crlf() {
         let mut p = Parser::new("\
@@ -1246,10 +1307,10 @@ trimmed in raw strings.
         assert!(table.lookup("foo_3").is_some());
         assert!(table.lookup("foo_-2--3--r23f--4-f2-4").is_some());
         assert!(table.lookup("a").is_some());
-        assert!(table.lookup("!").is_some());
-        assert!(table.lookup("\"").is_some());
-        assert!(table.lookup("character encoding").is_some());
-        assert!(table.lookup("ʎǝʞ").is_some());
+        assert!(table.lookup("\"!\"").is_some());
+        assert!(table.lookup("\"\\\"\"").is_some());
+        assert!(table.lookup("\"character encoding\"").is_some());
+        assert!(table.lookup("'ʎǝʞ'").is_some());
     }
 
     #[test]
@@ -1293,9 +1354,9 @@ trimmed in raw strings.
         ");
         let table = Table(p.parse().unwrap());
         assert!(table.lookup("a.b").is_some());
-        assert!(table.lookup("f f").is_some());
-        assert!(table.lookup("\"").is_some());
-        assert!(table.lookup("\"\"").is_some());
+        assert!(table.lookup("\"f f\"").is_some());
+        assert!(table.lookup("\"\\\"\"").is_some());
+        assert!(table.lookup("'\"\"'").is_some());
     }
 
     #[test]