more tests; add function expressions

src/grammar.json

@@ -152,6 +152,10 @@
           "type": "SYMBOL",
           "name": "variable_expr"
         },
+        {
+          "type": "SYMBOL",
+          "name": "function_call"
+        },
         {
           "type": "SYMBOL",
           "name": "for_expr"
@@ -686,6 +690,81 @@
       "type": "SYMBOL",
       "name": "identifier"
     },
+    "function_call": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "SYMBOL",
+          "name": "identifier"
+        },
+        {
+          "type": "STRING",
+          "value": "("
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "function_arguments"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
+        {
+          "type": "STRING",
+          "value": ")"
+        }
+      ]
+    },
+    "function_arguments": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "SYMBOL",
+          "name": "expression"
+        },
+        {
+          "type": "REPEAT",
+          "content": {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "STRING",
+                "value": ","
+              },
+              {
+                "type": "SYMBOL",
+                "name": "expression"
+              }
+            ]
+          }
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "CHOICE",
+              "members": [
+                {
+                  "type": "STRING",
+                  "value": ","
+                },
+                {
+                  "type": "STRING",
+                  "value": "..."
+                }
+              ]
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        }
+      ]
+    },
     "comment": {
       "type": "TOKEN",
       "content": {

src/node-types.json

@@ -156,6 +156,10 @@
           "type": "for_expr",
           "named": true
         },
+        {
+          "type": "function_call",
+          "named": true
+        },
         {
           "type": "get_attr",
           "named": true
@@ -312,6 +316,40 @@
       ]
     }
   },
+  {
+    "type": "function_arguments",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "expression",
+          "named": true
+        }
+      ]
+    }
+  },
+  {
+    "type": "function_call",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "function_arguments",
+          "named": true
+        },
+        {
+          "type": "identifier",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "get_attr",
     "named": true,