From ec31aae293f88e36190aa32169a97a776873567a Mon Sep 17 00:00:00 2001
From: Benjamin Paassen <bpaassen@techfak.uni-bielefeld.de>
Date: Wed, 19 Nov 2014 19:42:07 +0100
Subject: fixed a bug preventing the Tokenizer from finding the right token if
 a parse was incomplete beforehand. Also cleared the buffers if a subclass
 returns false from doPrepare. Failing to clear the buffers lead to subsequent
 problems.

---
 src/core/utils/Tokenizer.cpp | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

(limited to 'src/core/utils/Tokenizer.cpp')

diff --git a/src/core/utils/Tokenizer.cpp b/src/core/utils/Tokenizer.cpp
index 164a30f..a0ca3aa 100644
--- a/src/core/utils/Tokenizer.cpp
+++ b/src/core/utils/Tokenizer.cpp
@@ -82,8 +82,8 @@ bool Tokenizer::prepare()
 {
 	std::stringstream buffer;
 	char c;
-	const int startColumn = input.getColumn();
-	const int startLine = input.getLine();
+	int startColumn = input.getColumn();
+	int startLine = input.getLine();
 	bool bufEmpty = true;
 	while (input.peek(&c)) {
 		if (root.children.find(c) != root.children.end()) {
@@ -118,9 +118,10 @@ bool Tokenizer::prepare()
 					break;
 				}
 			}
+			//reset the peek pointer to the last valid position.
+			input.resetPeek();
 			// check if we did indeed find a special token.
 			if (match != TOKEN_NONE) {
-				input.resetPeek();
 				if (bufEmpty) {
 					// if we did not have text before, construct that token.
 					if (doPrepare(
@@ -128,8 +129,11 @@ bool Tokenizer::prepare()
 					              input.getColumn(), input.getLine()},
 					        peeked)) {
 						return true;
+					} else {
+						startColumn = input.getColumn();
+						startLine = input.getLine();
+						continue;
 					}
-
 				} else {
 					// otherwise we return the text before the token.
 					if (doPrepare(Token{TOKEN_TEXT, buffer.str(), startColumn,
@@ -137,8 +141,20 @@ bool Tokenizer::prepare()
 					                    input.getLine()},
 					              peeked)) {
 						return true;
-					}
+					} else{
+						//we need to clear the buffer here. After all the token
+						//corresponding to this buffer segment is already
+						//constructed.
+						buffer.str(std::string());
+						bufEmpty = true;
+						startColumn = input.getColumn();
+						startLine = input.getLine();
+						continue;
+					} 
 				}
+			} else{
+				//if we found nothing, read at least one character.
+				input.peek(&c);
 			}
 		}
 		buffer << c;
-- 
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