From 391d527328ff730f7418d0dac66966d35a545c30 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Sun, 26 Jul 2015 10:48:26 -0400
Subject: [PATCH] Lexer: Added end-boundary sensitivity to ::isLiteral and
 ::isOneOf

---
 src/Lexer.cpp | 18 ++++++++++--------
 src/Lexer.h   |  4 ++--
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/src/Lexer.cpp b/src/Lexer.cpp
index 5e6b8e400..bea0a5099 100644
--- a/src/Lexer.cpp
+++ b/src/Lexer.cpp
@@ -1101,14 +1101,16 @@ bool Lexer::isWord (std::string& token, Lexer::Type& type)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-bool Lexer::isLiteral (const std::string& literal)
+bool Lexer::isLiteral (const std::string& literal, bool endBoundary)
 {
-  if (_text.find (literal, _cursor) == 0 &&
-      (isEOS () ||
-       Lexer::isWhitespace (_text[_cursor + literal.length ()]) ||
-       Lexer::isSingleCharOperator (_text[_cursor + literal.length ()])))
+  auto len = literal.length ();
+  if (_text.find (literal, _cursor) == _cursor &&
+      (! endBoundary                              ||
+       _text.length () == _cursor + len           ||
+       Lexer::isWhitespace (_text[_cursor + len]) ||
+       Lexer::isSingleCharOperator (_text[_cursor + len])))
   {
-    _cursor += literal.length ();
+    _cursor += len;
     return true;
   }
 
@@ -1116,10 +1118,10 @@ bool Lexer::isLiteral (const std::string& literal)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-bool Lexer::isOneOf (const std::vector <std::string>& options)
+bool Lexer::isOneOf (const std::vector <std::string>& options, bool endBoundary)
 {
   for (auto& item : options)
-    if (isLiteral (item))
+    if (isLiteral (item, endBoundary))
       return true;
 
   return false;
diff --git a/src/Lexer.h b/src/Lexer.h
index b6b806dc3..93aec21cb 100644
--- a/src/Lexer.h
+++ b/src/Lexer.h
@@ -105,8 +105,8 @@ public:
   bool isDOM          (std::string&, Lexer::Type&);
   bool isIdentifier   (std::string&, Lexer::Type&);
   bool isWord         (std::string&, Lexer::Type&);
-  bool isLiteral      (const std::string&);
-  bool isOneOf        (const std::vector <std::string>&);
+  bool isLiteral      (const std::string&, bool);
+  bool isOneOf        (const std::vector <std::string>&, bool);
 
 private:
   std::string _text;