tj#12 replace use of callsite with standard Error object to fix issues with babel

Author: erossignon

.gitignore

@@ -1,3 +1,5 @@
 .DS_Store
 node_modules
 *.sock
+.idea
+

.npmignore

@@ -2,3 +2,5 @@ support
 test
 examples
 *.sock
+.idea/
+

Readme.md

@@ -1,8 +1,7 @@
 
 # better-assert
 
-  Better c-style assertions using [callsite](https://github.com/visionmedia/callsite) for
-  self-documenting failure messages.
+  Better c-style assertions for self-documenting failure messages.
 
 ## Installation
 

index.js

@@ -4,7 +4,7 @@
 
 var AssertionError = require('assert').AssertionError
   , callsite = require('callsite')
-  , fs = require('fs')
+  , fs = require('fs');
 
 /**
  * Expose `assert`.
@@ -21,18 +21,24 @@ module.exports = process.env.NO_ASSERT
 function assert(expr) {
   if (expr) return;
 
-  var stack = callsite();
-  var call = stack[1];
-  var file = call.getFileName();
-  var lineno = call.getLineNumber();
-  var src = fs.readFileSync(file, 'utf8');
-  var line = src.split('\n')[lineno-1];
-  var src = line.match(/assert\((.*)\)/)[1];
-
-  var err = new AssertionError({
-    message: src,
-    stackStartFunction: stack[0].getFunction()
-  });
-
-  throw err;
+    var a = new Error();
+    // 0 => Error
+    // 1 => at assert
+    // 2 =>  at Object.<anonymous> (/project/myproject/test/test-babel.js:15:1)', <= where the assert was raised !
+    // .....
+    //
+    var errorline = a.stack.split('\n')[2];
+    var m =  errorline.match(/at (.*)\((.*):([0-9]*):([0-9]*)\)/);
+    var func =  m[1]; // Object.<anonymous> ( not very useful)
+    var file =  m[2]; // filename
+    var lineno = parseInt(m[3]);
+    var fullsource = fs.readFileSync(file, 'utf8');
+    var line = fullsource.split('\n')[lineno-1];
+    var src = line.match(/.*assert\((.*)\)/)[1];
+    var err = new AssertionError({
+        message: src + "\n ",
+        stackStartFunction: assert
+    });
+    throw err;
 }
+

test/test-babel.js

@@ -0,0 +1,27 @@
+// run with babel-node
+//   install:
+//     * npm install --save-dev babel-core
+//     * npm install --save-dev babel-preset-es2015
+//     * npm install -g babel
+//       babel-node --presets es2015 ./test/test-babel.hs
+//
+// should display:
+// throw err;
+// ^
+// AssertionError: 1==2,"1 should be 2"
+//
+// at myFunction (/projects/better-assert/test/test-babel.js:23:5)
+// at Object.<anonymous> /projects/better-assert/test/test-babel.js:20:1)
+// at Module._compile (module.js:570:32)
+//...
+
+import assert from "..";
+
+
+
+function myFunction() {
+    assert(1==2,"1 should be 2");
+
+}
+
+myFunction();