Add a README

README.md

@@ -0,0 +1,65 @@
+# tree-sitter-newick
+
+A [tree-sitter](https://tree-sitter.github.io/tree-sitter/) grammar for the [Newick (nh, nwk)](https://en.wikipedia.org/wiki/Newick_format) and [New Hampshire X (nhx)](https://www.cs.mcgill.ca/~birch/birchhomedir/java/forester/NHX.pdf) formats for trees representation.
+
+# Example
+
+## NHX source
+
+```
+(
+    (
+        (
+            ADH2:0.1[&&NHX:S=human:E=1.1.1.1],
+            ADH1:0.11[&&NHX:S=human:E=1.1.1.1]
+        ):0.05[&&NHX:S=Primates:E=1.1.1.1:D=Y:B=100],
+        ADHY:0.1[&&NHX:S=nematode:E=1.1.1.1],
+        ADHX:0.12[&&NHX:S=insect:E=1.1.1.1]
+    ):0.1[&&NHX:S=Metazoa:E=1.1.1.1:D=N],
+    (
+    ADH4:0.09[&&NHX:S=yeast:E=1.1.1.1],
+    ADH3:0.13[&&NHX:S=yeast:E=1.1.1.1],
+    ADH2:0.12[&&NHX:S=yeast:E=1.1.1.1],
+    ADH1:0.11[&&NHX:S=yeast:E=1.1.1.1]
+    ):0.1[&&NHX:S=Fungi]
+)[&&NHX:E=1.1.1.1:D=N];
+```
+
+## tree-sitter-newick highlighting
+
+![NHX file highlighted by tree-sitter-newick](./example.png)
+
+## Syntax tree
+
+```
+(source_file [0, 0] - [16, 0]
+  (tree [0, 0] - [15, 23]
+    clade: (clade [0, 0] - [15, 22]
+      clade: (clade [1, 4] - [8, 40]
+        clade: (clade [2, 8] - [5, 52]
+          leaf: (leaf [3, 12] - [3, 45]
+            name: (name [3, 12] - [3, 16])
+            attributes: (attributes [3, 16] - [3, 45]
+              length: (length [3, 17] - [3, 20]
+                (float [3, 17] - [3, 20]))
+              data: (data [3, 20] - [3, 45]
+                entry: (nhx_entry [3, 26] - [3, 34]
+                  key: (nhx_val [3, 27] - [3, 28])
+                  value: (nhx_val [3, 29] - [3, 34]))
+                entry: (nhx_entry [3, 34] - [3, 44]
+                  key: (nhx_val [3, 35] - [3, 36])
+                  value: (nhx_val [3, 37] - [3, 44])))))
+          leaf: (leaf [4, 12] - [4, 46]
+            name: (name [4, 12] - [4, 16])
+            attributes: (attributes [4, 16] - [4, 46]
+              length: (length [4, 17] - [4, 21]
+                (float [4, 17] - [4, 21]))
+              data: (data [4, 21] - [4, 46]
+                entry: (nhx_entry [4, 27] - [4, 35]
+                  key: (nhx_val [4, 28] - [4, 29])
+                  value: (nhx_val [4, 30] - [4, 35]))
+                entry: (nhx_entry [4, 35] - [4, 45]
+                  key: (nhx_val [4, 36] - [4, 37])
+                  value: (nhx_val [4, 38] - [4, 45])))))
+...
+```

examples/nhx.nhx

@@ -0,0 +1,16 @@
+(
+    (
+        (
+            ADH2:0.1[&&NHX:S=human:E=1.1.1.1],
+            ADH1:0.11[&&NHX:S=human:E=1.1.1.1]
+        ):0.05[&&NHX:S=Primates:E=1.1.1.1:D=Y:B=100],
+        ADHY:0.1[&&NHX:S=nematode:E=1.1.1.1],
+        ADHX:0.12[&&NHX:S=insect:E=1.1.1.1]
+    ):0.1[&&NHX:S=Metazoa:E=1.1.1.1:D=N],
+    (
+    ADH4:0.09[&&NHX:S=yeast:E=1.1.1.1],
+    ADH3:0.13[&&NHX:S=yeast:E=1.1.1.1],
+    ADH2:0.12[&&NHX:S=yeast:E=1.1.1.1],
+    ADH1:0.11[&&NHX:S=yeast:E=1.1.1.1]
+    ):0.1[&&NHX:S=Fungi]
+)[&&NHX:E=1.1.1.1:D=N];

package.json

@@ -25,7 +25,7 @@
     "tree-sitter": [
         {
             "scope": "source.newick",
-            "file-types": ["nhx", "nwk"]
+            "file-types": ["nh", "nhx", "nwk"]
         }
     ]
 }

queries/highlights.scm

@@ -1,6 +1,8 @@
 "(" @punctuation.bracket
 ")" @punctuation.bracket
+"[&&NHX" @punctuation.bracket
+"]" @punctuation.bracket
 
 (name) @function
 (length) @number
-(nhx_entry key: (nhx_val) @variable value: (nhx_val) @string.special)
+(nhx_entry key: (nhx_val) @keyword value: (nhx_val) @string.special)