diff --git a/plyproto/model.py b/plyproto/model.py
index f3b33d6..bcff7ee 100644
--- a/plyproto/model.py
+++ b/plyproto/model.py
@@ -36,6 +36,46 @@
     # visitor.visit_Name(self)
     # visitor.visit_Proto(self)
 
+# Lexical unit - contains lexspan and linespan for later analysis.
+class LU(object):
+    def __init__(self, p, idx):
+        self.p = p
+        self.idx = idx
+        self.pval = p[idx]
+        self.lexspan = p.lexspan(idx)
+        self.linespan = p.linespan(idx)
+
+        # If string is in the value (raw value) and start and stop lexspan is the same, add real span
+        # obtained by string length.
+        if isinstance(self.pval, str) \
+                and self.lexspan != None \
+                and self.lexspan[0] == self.lexspan[1] \
+                and self.lexspan[0] != 0:
+            self.lexspan = tuple([self.lexspan[0], self.lexspan[0] + len(self.pval)])
+        super(LU, self).__init__()
+
+    @staticmethod
+    def i(p, idx):
+        if isinstance(p[idx], LU): return p[idx]
+        if isinstance(p[idx], str): return LU(p, idx)
+        return p[idx]
+
+    def describe(self):
+        return "LU(%s,%s)" % (self.pval,  self.lexspan)
+
+    def __str__(self):
+        return self.pval
+
+    def __repr__(self):
+        return self.describe()
+
+    def accept(self, visitor):
+        pass
+
+    def __iter__(self):
+        for x in self.pval:
+            yield x
+
 # Base node
 class SourceElement(object):
     '''
@@ -232,6 +272,7 @@
         super(Name, self).__init__(linespan=linespan, lexspan=lexspan, p=p)
         self._fields += ['value']
         self.value = value
+        self.deriveLex()
 
     def append_name(self, name):
         try:
@@ -239,9 +280,37 @@
         except:
             self.value = self.value + '.' + name
 
+    def deriveLex(self):
+        if hasattr(self.value, "lexspan"):
+            self.lexspan = self.value.lexspan
+            self.linespan = self.value.linespan
+        else:
+            return
+
     def accept(self, visitor):
         visitor.visit_Name(self)
 
+class DotName(Name):
+    elements = []
+    def __init__(self, elements, linespan=None, lexspan=None, p=None):
+        super(DotName, self).__init__('.'.join([str(x) for x in elements]), linespan=linespan, lexspan=lexspan, p=p)
+        self._fields += ['elements']
+        self.elements = elements
+        self.deriveLex()
+
+    def deriveLex(self):
+        if isinstance(self.elements, list) and len(self.elements)>0:
+            self.lexspan = (min([x.lexspan[0] for x in self.elements if x.lexspan[0] != 0]), max([x.lexspan[1] for x in self.elements if x.lexspan[1] != 0]))
+            self.linespan = (min([x.linespan[0] for x in self.elements if x.linespan[0] != 0]), max([x.linespan[1] for x in self.elements if x.linespan[1] != 0]))
+        elif hasattr(self.elements, "lexspan"):
+            self.lexspan = self.elements.lexspan
+            self.linespan = self.elements.linespan
+        else:
+            return
+
+    def accept(self, visitor):
+        visitor.visit_DotName(self)
+
 class ProtoFile(SourceElement):
 
     def __init__(self, pkg, body, linespan=None, lexspan=None, p=None):
diff --git a/plyproto/parser.py b/plyproto/parser.py
index 275a2ca..b827ab0 100755
--- a/plyproto/parser.py
+++ b/plyproto/parser.py
@@ -21,7 +21,7 @@
 
         'LBRACE', 'RBRACE', 'LBRACK', 'RBRACK',
         'LPAR', 'RPAR', 'EQ', 'SEMI', 'DOT',
-        'PLUSPLUSPLUS'
+        'STARTTOKEN'
 
     ] + [k.upper() for k in keywords]
     literals = '()+-*/=?:,.^|&~!=[]{};<>@%'
@@ -44,7 +44,7 @@
     t_SEMI = ';'
     t_DOT = '\\.'
     t_ignore = ' \t\f'
-    t_PLUSPLUSPLUS = '\\+\\+\\+'
+    t_STARTTOKEN = '\\+'
 
     def t_NAME(self, t):
         '[A-Za-z_$][A-Za-z0-9_$]*'
@@ -66,33 +66,53 @@
         t.lexer.skip(1)
 
 class LexHelper:
-    @staticmethod
-    def get_max_linespan(p):
+    offset = 0
+    def get_max_linespan(self, p):
+        defSpan=[1e60, -1]
         mSpan=[1e60, -1]
         for sp in range(0, len(p)):
             csp = p.linespan(sp)
-            if csp[0]==0 and csp[1]==0: continue
+            if csp[0] == 0 and csp[1] == 0:
+                if hasattr(p[sp], "linespan"):
+                    csp = p[sp].linespan
+                else:
+                    continue
+            if csp == None or len(csp) != 2: continue
+            if csp[0] == 0 and csp[1] == 0: continue
             if csp[0] < mSpan[0]: mSpan[0] = csp[0]
             if csp[1] > mSpan[1]: mSpan[1] = csp[1]
-        return tuple(mSpan)
+        if defSpan == mSpan: return (0,0)
+        return tuple([mSpan[0]-self.offset, mSpan[1]-self.offset])
 
-    @staticmethod
-    def get_max_lexspan(p):
+    def get_max_lexspan(self, p):
+        defSpan=[1e60, -1]
         mSpan=[1e60, -1]
         for sp in range(0, len(p)):
             csp = p.lexspan(sp)
-            if csp[0]==0 and csp[1]==0: continue
+            if csp[0] == 0 and csp[1] == 0:
+                if hasattr(p[sp], "lexspan"):
+                    csp = p[sp].lexspan
+                else:
+                    continue
+            if csp == None or len(csp) != 2: continue
+            if csp[0] == 0 and csp[1] == 0: continue
             if csp[0] < mSpan[0]: mSpan[0] = csp[0]
             if csp[1] > mSpan[1]: mSpan[1] = csp[1]
-        return tuple(mSpan)
+        if defSpan == mSpan: return (0,0)
+        return tuple([mSpan[0]-self.offset, mSpan[1]-self.offset])
 
-    @staticmethod
-    def set_parse_object(dst, p):
-        dst.setLexData(linespan=LexHelper.get_max_linespan(p), lexspan=LexHelper.get_max_lexspan(p))
+    def set_parse_object(self, dst, p):
+        dst.setLexData(linespan=self.get_max_linespan(p), lexspan=self.get_max_lexspan(p))
         dst.setLexObj(p)
 
 class ProtobufParser(object):
     tokens = ProtobufLexer.tokens
+    offset = 0
+    lh = LexHelper()
+
+    def setOffset(self, of):
+        self.offset = of
+        self.lh.offset = of
 
     def p_empty(self, p):
         '''empty :'''
@@ -102,7 +122,7 @@
         '''field_modifier : REQUIRED
                           | OPTIONAL
                           | REPEATED'''
-        p[0] = p[1]
+        p[0] = LU.i(p,1)
 
     def p_primitive_type(self, p):
         '''primitive_type : DOUBLE
@@ -120,26 +140,28 @@
                           | BOOL
                           | STRING
                           | BYTES'''
-        p[0] = p[1]
+        p[0] = LU.i(p,1)
 
     def p_field_id(self, p):
         '''field_id : NUM'''
-        p[0] = p[1]
+        p[0] = LU.i(p,1)
 
     def p_rvalue(self, p):
         '''rvalue : NUM
                   | TRUE
                   | FALSE'''
-        p[0] = p[1]
+        p[0] = LU.i(p,1)
 
     def p_rvalue2(self, p):
         '''rvalue : NAME'''
-        p[0] = Name(p[1])
+        p[0] = Name(LU.i(p, 1))
+        self.lh.set_parse_object(p[0], p)
+        p[0].deriveLex()
 
     def p_field_directive(self, p):
         '''field_directive : LBRACK NAME EQ rvalue RBRACK'''
-        p[0] = FieldDirective(Name(p[2]), p[4])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = FieldDirective(Name(LU.i(p, 2)), LU.i(p,4))
+        self.lh.set_parse_object(p[0], p)
 
     def p_field_directive_times(self, p):
         '''field_directive_times : field_directive_plus'''
@@ -160,36 +182,42 @@
     def p_dotname(self, p):
         '''dotname : NAME
                    | dotname DOT NAME'''
-        p[0] = p[1]
+        if len(p) == 2:
+            p[0] = [LU(p,1)]
+        else:
+            p[0] = p[1] + [LU(p,3)]
 
     # Hack for cases when there is a field named 'message' or 'max'
     def p_fieldName(self, p):
         '''field_name : NAME
                       | MESSAGE
                       | MAX'''
-        p[0] = p[1]
+        p[0] = Name(LU.i(p,1))
+        self.lh.set_parse_object(p[0], p)
+        p[0].deriveLex()
 
     def p_field_type(self, p):
         '''field_type : primitive_type'''
-        p[0] = FieldType(p[1])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = FieldType(LU.i(p,1))
+        self.lh.set_parse_object(p[0], p)
 
     def p_field_type2(self, p):
         '''field_type : dotname'''
-        p[0] = Name(p[1])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = DotName(LU.i(p, 1))
+        self.lh.set_parse_object(p[0], p)
+        p[0].deriveLex()
 
     # Root of the field declaration.
     def p_field_definition(self, p):
         '''field_definition : field_modifier field_type field_name EQ field_id field_directive_times SEMI'''
-        p[0] = FieldDefinition(p[1], p[2], Name(p[3]), p[5], p[6])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = FieldDefinition(LU.i(p,1), LU.i(p,2), LU.i(p, 3), LU.i(p,5), LU.i(p,6))
+        self.lh.set_parse_object(p[0], p)
 
     # Root of the enum field declaration.
     def p_enum_field(self, p):
         '''enum_field : field_name EQ NUM SEMI'''
-        p[0] = EnumFieldDefinition(Name(p[1]), p[3])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = EnumFieldDefinition(LU.i(p, 1), LU.i(p,3))
+        self.lh.set_parse_object(p[0], p)
 
     def p_enum_body_part(self, p):
         '''enum_body_part : enum_field
@@ -216,28 +244,29 @@
     # enum_definition ::= 'enum' ident '{' { ident '=' integer ';' }* '}'
     def p_enum_definition(self, p):
         '''enum_definition : ENUM NAME LBRACE enum_body_opt RBRACE'''
-        p[0] = EnumDefinition(Name(p[2]), p[4])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = EnumDefinition(Name(LU.i(p, 2)), LU.i(p,4))
+        self.lh.set_parse_object(p[0], p)
 
     def p_extensions_to(self, p):
         '''extensions_to : MAX'''
         p[0] = ExtensionsMax()
+        self.lh.set_parse_object(p[0], p)
 
     def p_extensions_to2(self, p):
         '''extensions_to : NUM'''
-        p[0] = p[1]
+        p[0] = LU.i(p, 1)
 
     # extensions_definition ::= 'extensions' integer 'to' integer ';'
     def p_extensions_definition(self, p):
         '''extensions_definition : EXTENSIONS NUM TO extensions_to SEMI'''
-        p[0] = ExtensionsDirective(p[2], p[4])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = ExtensionsDirective(LU.i(p,2), LU.i(p,4))
+        self.lh.set_parse_object(p[0], p)
 
     # message_extension ::= 'extend' ident '{' message_body '}'
     def p_message_extension(self, p):
         '''message_extension : EXTEND NAME LBRACE message_body RBRACE'''
-        p[0] = MessageExtension(Name(p[2]), p[4])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = MessageExtension(Name(LU.i(p, 2)), LU.i(p,4))
+        self.lh.set_parse_object(p[0], p)
 
     def p_message_body_part(self, p):
         '''message_body_part : field_definition
@@ -265,14 +294,14 @@
     # message_definition = MESSAGE_ - ident("messageId") + LBRACE + message_body("body") + RBRACE
     def p_message_definition(self, p):
         '''message_definition : MESSAGE NAME LBRACE message_body RBRACE'''
-        p[0] = MessageDefinition(Name(p[2]), p[4])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = MessageDefinition(Name(LU.i(p, 2)), LU.i(p,4))
+        self.lh.set_parse_object(p[0], p)
 
     # method_definition ::= 'rpc' ident '(' [ ident ] ')' 'returns' '(' [ ident ] ')' ';'
     def p_method_definition(self, p):
         '''method_definition : RPC NAME LPAR NAME RPAR RETURNS LPAR NAME RPAR'''
-        p[0] = MethodDefinition(Name(p[2]), Name(p[4]), Name(p[8]))
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = MethodDefinition(Name(LU.i(p, 2)), Name(LU.i(p, 4)), Name(LU.i(p, 8)))
+        self.lh.set_parse_object(p[0], p)
 
     def p_method_definition_opt(self, p):
         '''method_definition_opt : empty'''
@@ -290,36 +319,40 @@
     # service_definition = SERVICE_ - ident("serviceName") + LBRACE + ZeroOrMore(Group(method_definition)) + RBRACE
     def p_service_definition(self, p):
         '''service_definition : SERVICE NAME LBRACE method_definition_opt RBRACE'''
-        p[0] = ServiceDefinition(Name(p[2]), p[4])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = ServiceDefinition(Name(LU.i(p, 2)), LU.i(p,4))
+        self.lh.set_parse_object(p[0], p)
 
     # package_directive ::= 'package' ident [ '.' ident]* ';'
     def p_package_directive(self,p):
         '''package_directive : PACKAGE dotname SEMI'''
-        p[0] = PackageStatement(Name(p[2]))
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = PackageStatement(Name(LU.i(p, 2)))
+        self.lh.set_parse_object(p[0], p)
 
     # import_directive = IMPORT_ - quotedString("importFileSpec") + SEMI
     def p_import_directive(self, p):
         '''import_directive : IMPORT STRING_LITERAL SEMI'''
-        p[0] = ImportStatement(Literal(p[2]))
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = ImportStatement(Literal(LU.i(p,2)))
+        self.lh.set_parse_object(p[0], p)
 
     def p_option_rvalue(self, p):
         '''option_rvalue : NUM
                          | TRUE
                          | FALSE'''
-        p[0] = p[1]
+        p[0] = LU(p, 1)
 
     def p_option_rvalue2(self, p):
         '''option_rvalue : STRING_LITERAL'''
-        p[0] = Literal(p[1])
+        p[0] = Literal(LU(p,1))
+
+    def p_option_rvalue3(self, p):
+        '''option_rvalue : NAME'''
+        p[0] = Name(LU.i(p,1))
 
     # option_directive = OPTION_ - ident("optionName") + EQ + quotedString("optionValue") + SEMI
     def p_option_directive(self, p):
         '''option_directive : OPTION NAME EQ option_rvalue SEMI'''
-        p[0] = OptionStatement(Name(p[2]), p[4])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = OptionStatement(Name(LU.i(p, 2)), LU.i(p,4))
+        self.lh.set_parse_object(p[0], p)
 
     # topLevelStatement = Group(message_definition | message_extension | enum_definition | service_definition | import_directive | option_directive)
     def p_topLevel(self,p):
@@ -354,12 +387,12 @@
     # parser = Optional(package_directive) + ZeroOrMore(topLevelStatement)
     def p_protofile(self, p):
         '''protofile : package_definition statements'''
-        p[0] = ProtoFile(p[1], p[2])
-        LexHelper.set_parse_object(p[0], p)
+        p[0] = ProtoFile(LU.i(p,1), LU.i(p,2))
+        self.lh.set_parse_object(p[0], p)
 
     # Parsing starting point
     def p_goal(self, p):
-        '''goal : PLUSPLUSPLUS protofile'''
+        '''goal : STARTTOKEN protofile'''
         p[0] = p[2]
 
     def p_error(self, p):
@@ -384,8 +417,9 @@
             content += line
         return self.tokenize_string(content)
 
-    def parse_string(self, code, debug=0, lineno=1, prefix='+++'):
+    def parse_string(self, code, debug=0, lineno=1, prefix='+'):
         self.lexer.lineno = lineno
+        self.parser.offset = len(prefix)
         return self.parser.parse(prefix + code, lexer=self.lexer, debug=debug)
 
     def parse_file(self, _file, debug=0):