[update] Unified the exceptions thrown by sjscript.

sjscript/src/sjscript/ScriptException.d

@@ -0,0 +1,22 @@
+/// License: MIT
+module sjscript.ScriptException;
+
+import dast.tokenize;
+
+///
+class ScriptException : Exception {
+ public:
+  ///
+  this(string msg, TokenPos pos, string file = __FILE__, size_t line = __LINE__) {
+    super(msg, file, line);
+    this.pos = pos;
+  }
+  ///
+  this(
+      string msg, size_t stline, size_t stchar,
+      string file = __FILE__, size_t line = __LINE__) {
+    super(msg, file, line);
+    pos = TokenPos(stline, stline, stchar, stchar+1);
+  }
+  const TokenPos pos;
+}

sjscript/src/sjscript/exception.d

@@ -1,27 +0,0 @@
-/// License: MIT
-module sjscript.exception;
-
-import sjscript.Token;
-
-///
-class ScriptException : Exception {
- public:
-  ///
-  this(string msg, Token token, string file = __FILE__, size_t line = __LINE__) {
-    super(msg, file, line);
-    this.token = token;
-  }
-  const Token token;
-}
-///
-class PreprocessException : ScriptException {
- public:
-  mixin ExceptionConstructor;
-}
-
-private mixin template ExceptionConstructor() {
- public:
-  this(string msg, Token token, string file = __FILE__, size_t line = __LINE__) {
-    super(msg, token, file, line);
-  }
-}

sjscript/src/sjscript/func.d

@@ -38,6 +38,6 @@ float CallFunction(string name, float[] args) {
     case "step":  EnforceArgs!2; return args[1] > args[0]? 1: 0;
     case "clamp": EnforceArgs!3; return clamp(args[0], args[1], args[2]);
 
-    default: throw new Exception("unknown exception");
+    default: throw new Exception("unknown function");
   }
 }

sjscript/src/sjscript/package.d

@@ -11,10 +11,9 @@ import sjscript.Token,
        sjscript.preprocess;
 
 public {
-  import sjscript.Expression,
-         sjscript.ParametersBlock,
-         sjscript.calculate,
-         sjscript.exception;
+  import sjscript.ParametersBlock,
+         sjscript.ScriptException,
+         sjscript.calculate;
 }
 
 ///

sjscript/src/sjscript/parse.d

@@ -8,6 +8,7 @@ import dast.parse;
 
 import sjscript.Expression,
        sjscript.ParametersBlock,
+       sjscript.ScriptException,
        sjscript.Token,
        sjscript.calculate;
 
@@ -33,7 +34,18 @@ EOS";
 ///
 ParametersBlock[] Parse(R)(R tokens)
     if (isInputRange!R && is(ElementType!R == Token)) {
+  import dast.tokenize : TokenizeException;
+
+  alias Token = ElementType!R;
+  try {
     return dast.parse.Parse!Whole(tokens, cast(RuleSet) null).blocks;
+
+  } catch (TokenizeException e) {
+    throw new ScriptException(e.msg, e.srcline, e.srcchar);
+
+  } catch (ParseException!Token e) {
+    throw new ScriptException(e.msg, e.token.pos);
+  }
 }
 
 private class RuleSet {

sjscript/src/sjscript/preprocess.d

@@ -9,8 +9,8 @@ import std.algorithm,
        std.range.primitives,
        std.typecons;
 
-import sjscript.Token,
-       sjscript.exception;
+import sjscript.ScriptException,
+       sjscript.Token;
 
 ///
 unittest {
@@ -46,7 +46,7 @@ EOS";
     enum src = q"EOS
       $unknown_template
 EOS";
-    assertThrown!PreprocessException(Tokenize(src).array);
+    assertThrown!ScriptException(Tokenize(src).array);
   }
 }
 
@@ -243,5 +243,5 @@ private struct Preprocessor(R)
 
 private void enforce(T)(T val, string msg, lazy Token token,
     string file = __FILE__, size_t line = __LINE__) {
-  if (!val) throw new PreprocessException(msg, token, file, line);
+  if (!val) throw new ScriptException(msg, token.pos, file, line);
 }