Rewrite ReportError() and change EParse to report columns in chars.

ReportError() needed to account for terminal encodings that don't support the characters being printed. It was also reporting an inaccurate column number and its corresponding marker position, because the count was in bytes, not in characters, so that has been fixed.

Now EParse.__init__() calls a new function GetErrLineCol() that calculates the line and column corresponding to an error position.

The algorithm for finding the start of the line has also been changed in both ReportError() and EParse.__init__(); as a result, function fieldpos() has been removed.

The exception's lno and cno fields have been changed to be 1-based, rather than 0-based.

Thanks to @Jomik for the report. Fixes #5.

testparser.py

@@ -21,7 +21,7 @@
 from lslopt.lslparse import parser,EParseSyntax,EParseUEOF,EParseAlreadyDefined,\
     EParseUndefined,EParseTypeMismatch,EParseReturnShouldBeEmpty,EParseReturnIsEmpty,\
     EParseInvalidField,EParseFunctionMismatch,EParseDeclarationScope,\
-    EParseDuplicateLabel,EParseCantChangeState,EParseCodePathWithoutRet,fieldpos
+    EParseDuplicateLabel,EParseCantChangeState,EParseCodePathWithoutRet
 from lslopt.lsloutput import outscript
 from lslopt.lsloptimizer import optimizer
 from lslopt import lslfuncs
@@ -217,7 +217,6 @@ class Test02_Parser(UnitTestCase):
             ))
         print self.parser.scopeindex
 
-        self.assertEqual(fieldpos("a,b", ",", 3), -1)
         self.assertEqual(self.outscript.Value2LSL(lslfuncs.Key(u'')), '((key)"")')
         self.assertRaises(AssertionError, self.outscript.Value2LSL, '')
 
@@ -528,7 +527,7 @@ class Test03_Optimizer(UnitTestCase):
             self.assertFalse(True)
         except EParseSyntax as e:
             # should err before first closing brace
-            self.assertEqual(e.cno, 27)
+            self.assertEqual(e.cno, 28)
         except:
             # should raise no other exception
             self.assertFalse(True)