better error handling

server/parse.js

@@ -789,6 +789,11 @@ function parse(tokens) {
     return parseIf(tokens, linenum, charnum);
   }
   else if (toktype === "left_paren") {
+    if (tokens.length == 0) {
+      throw error.JSyntaxError(linenum,
+                               charnum,
+                               "Unexpected end of source");
+    }
     if (fst(tokens)[0] === "lambda") {
       tokens.pop();
       var parsed = parseLambda(tokens, linenum, charnum);
@@ -810,7 +815,6 @@ function parseFull(tokenized) {
   var ast = [];
   var typeBindings = {};
   var current;
-  try {
   while (tokenized.length > 0) {
     current = closure.annotate_fvs(desugarer.desugar(parse(tokenized), typeBindings));
     ast.push(current);
@@ -819,15 +823,6 @@ function parseFull(tokenized) {
     "ast" : ast,
     "types" : typeBindings
   };
-  } catch (e) {
-      if (e.stxerror !== undefined) {
-        e.stxerror();
-        console.error("Tokenization error");
-      }
-      else {
-        console.log(e.errormessage);
-      }
-  }
 }
 
 export default { parse : function(str) {

server/rollup.config.js

@@ -14,8 +14,7 @@ export default {
     commonjs({
       './vm.js' : ['evaluateString']
     }),
-    buble(),
+    buble()
-    uglify()
   ],
   format: 'iife'
 }

server/tags/test.tag

@@ -25,7 +25,17 @@ self.default = "";
 evaluate(ev) {
   ev.preventDefault();
   var input = self.refs.input;
+  if (!input.value) {
+    return;
+  }
+  else {
+    try {
       self.outputs.push(JSON.stringify(vm.evaluateString(input.value)));
+    }
+    catch (e) {
+      self.outputs.push(`Error: ${e.errormessage}`);
+    }
+  }
   self.refs.input.value = self.default;
   self.update();
 }

server/tokenize.js

@@ -384,7 +384,6 @@ function tokenize(tokstream, matchop) {
 }
 
 function tokenizeHelp(input, matchop, strip_whitespace) {
-  try {
   return tokenize(input, matchop).reverse().filter(function(x) {
     if (strip_whitespace) {
       return x[0] !== "whitespace";
@@ -393,9 +392,6 @@ function tokenizeHelp(input, matchop, strip_whitespace) {
       return true;
     }
   });
-  } catch (e) {
-    console.log(e.stxerror());
-  }
 }
 
 var defop_pattern = ["defop", "integer", "constructor",