[VER] 0.3.7-alpha

[Fix] 修复科学表达式数字解析的问题（Lexer引起） 由 Satklomi发现，感谢
[Feat] 增加Compiler相关定义，将开发BytecodeVM
[Tip] Evaluator进入Bug fix阶段，新功能延缓开发。转向VM

src/Module/Library/std/formater/formater.fig

@@ -7,17 +7,40 @@
 
 import std.value; // `type` function and string_from
 
+
+struct FormatError 
+{
+    public msg: String;
+}
+
+impl Error for FormatError
+{
+    getErrorClass()
+    {
+        return "FormatError";
+    }
+    getErrorMessage()
+    {
+        return getErrorClass() + ": " + msg;
+    }
+    toString()
+    {
+        return getErrorMessage();
+    }
+}
+
 public func format(objects ...) -> Any
 {
     if objects.length() < 1
     {
-        return null;
+        throw FormatError{"Require format string"};
     }
 
     var fmt := objects[0];
-    if value.type(fmt) != "String"
+    var fmtType := value.type(fmt);
+    if fmtType != "String"
     {
-        return null;
+        throw FormatError{"arg 0 (fmt) must be String type, got " + fmtType};
     }
 
     var result := "";
@@ -33,7 +56,7 @@ public func format(objects ...) -> Any
         {
             if (i + 1 >= length)
             {
-                return null;
+                throw FormatError{"unclosed brace"};
             }
             
             var nextChar = fmt[i + 1];
@@ -57,12 +80,12 @@ public func format(objects ...) -> Any
             
             if endIndex == -1
             {
-                return null;
+                throw FormatError{"unclosed brace"};
             }
             
             if argIndex >= objects.length()
             {
-                return null;
+                throw FormatError{"require enough format expression"};
             }
             
             result += value.string_from(objects[argIndex]);
@@ -79,7 +102,7 @@ public func format(objects ...) -> Any
                 continue;
             }
             
-            return null;
+            throw FormatError{"invalid format syntax"};
         }
         else
         {
@@ -97,15 +120,16 @@ public func formatByListArgs(objects) -> Any
     {
         return null;
     }
-    if objects.length() < 1
+if objects.length() < 1
     {
-        return null;
+        throw FormatError{"Require format string"};
     }
 
     var fmt := objects[0];
-    if value.type(fmt) != "String"
+    var fmtType := value.type(fmt);
+    if fmtType != "String"
     {
-        return null;
+        throw FormatError{"arg 0 (fmt) must be String type, got " + fmtType};
     }
 
     var result := "";
@@ -121,7 +145,7 @@ public func formatByListArgs(objects) -> Any
         {
             if (i + 1 >= length)
             {
-                return null;
+                throw FormatError{"unclosed brace"};
             }
             
             var nextChar = fmt[i + 1];
@@ -145,12 +169,12 @@ public func formatByListArgs(objects) -> Any
             
             if endIndex == -1
             {
-                return null;
+                throw FormatError{"unclosed brace"};
             }
             
             if argIndex >= objects.length()
             {
-                return null;
+                throw FormatError{"require enough format expression"};
             }
             
             result += value.string_from(objects[argIndex]);
@@ -167,7 +191,7 @@ public func formatByListArgs(objects) -> Any
                 continue;
             }
             
-            return null;
+            throw FormatError{"invalid format syntax"};
         }
         else
         {

src/Module/Library/std/io/io.fig

@@ -43,7 +43,8 @@ public func println(objects...) -> Int
 
 public func printf(objects...) -> Any
 {
-    __fstdout_print(formater.formatByListArgs(objects));
+    var result := formater.formatByListArgs(objects);
+    __fstdout_print(result);
 }
 
 // inputs