more error stuff

errors.js

@@ -19,17 +19,28 @@ var JLException = {
     }
 }
 
-function SyntaxError(linenum, charnum, message) {
+function JSyntaxError(linenum, charnum, message) {
   this.linenum = linenum;
   this.charnum = charnum;
   this.errormessage = message;
+  this.stxerror = function() {
+  console.log("Syntax Error\n",
+                "Line #", this.linenum,"\n",
+                "Character #", this.charnum, "\n",
+                this.errormessage);
+  };
   return this;
 }
 
-function TypeError(linenum, charnum, token, message) {
+function JTypeError(linenum, charnum, token, message) {
   this.linenum = linenum;
   this.charnum = charnum;
   this.errormessage = message;
   this.token = token;
   return this;
 }
+TypeError.prototype = JLException;
+
+module.exports =
+  {JSyntaxError : JSyntaxError,
+   JTypeError : JTypeError};

parse.js

@@ -6,6 +6,7 @@ var tool = require("./tools.js");
 var tokenizer = require("./tokenize.js");
 var desugarer = require("./desugar.js");
 var pprint = require("./pprint.js");
+var error = require("./errors.js");
 
 var print = console.log;
 
@@ -45,7 +46,7 @@ function parseMany(exprType, valid, tokens) {
 		parsed = parse(tokens);
 	}
 	else {
-		throw "Error: unexpected token "+fst(tokens)[0]+" in parseMany";
+		throw error.JSyntaxError(fst(tokens)[2], fst(tokens)[3], "Error: unexpected token "+fst(tokens)[0]+" in parseMany");
 	}
   results.push(parsed);
 
@@ -105,7 +106,7 @@ function parseList(tokens) {
     var xs = parseBetween(function (x) { return true; }, "comma", tokens);
   }
   if (fst(tokens)[0] !== "right_square") {
-    throw "Error, list must be terminated by ]";
+    throw error.JSyntaxError(fst(tokens)[3], fst(tokens)[2], "Error, list must be terminated by ]");
   }
   tokens.pop();
   return new typ.ListT(xs);
@@ -114,8 +115,8 @@ function parseList(tokens) {
 
 function parseDefFunction(tokens) {
 	var fname = parse(tokens);
-  if (!fname.exprType === "identifier") {
-    throw "Error, expected an identifier in function definition";
+  if (fname.exprType != "Name") {
+    throw error.JSyntaxError(fst(tokens)[3], fst(tokens)[2], "Error, expected an identifier in function definition");
   }
   if (fst(tokens)[0] === "right_paren") {
     var parameters = [];
@@ -319,8 +320,7 @@ function parseFull(tokenized) {
     }
     return ast;
   } catch (e) {
-    print("An exception occured, could not finish parsing");
-    print(e);
+      e.stxerror();
       process.exit(1);
   }
 }

tokenize.js

@@ -2,6 +2,7 @@
 
 var rep = require("./representation.js");
 var tools = require("./tools.js");
+var error = require("./errors.js");
 var operators = Object.keys(rep.OPInfo);
 
 var matchop = tools.opMatch(operators);
@@ -103,7 +104,7 @@ function tokenizeStr(tokstream, charnum, linenum) {
     n++;
     charnum++;
     if (tokstream.length < 1) {
-      throw "Error: missing quotation mark";
+      throw error.JSyntaxError(linenum, charnum, "Error: missing quotation mark");
     }
   }
   n++;
@@ -316,8 +317,7 @@ function tokenizeFull(input) {
       return x[0] !== "whitespace";
     });
   } catch (e) {
-    console.log("An error occured during tokenization");
-    console.log(e);
+    console.log(e.stxerror());
     process.exit(1);
   }
 }