From b36c695f216588b444ba511fbe1733fb112ab3d9 Mon Sep 17 00:00:00 2001
From: Andreas Stöckel <astoecke@techfak.uni-bielefeld.de>
Date: Thu, 1 Jan 2015 15:10:13 +0100
Subject: Added new functions to get the context at a certain byte offset

---
 src/core/common/CharReader.cpp | 40 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 5 deletions(-)

(limited to 'src/core/common/CharReader.cpp')

diff --git a/src/core/common/CharReader.cpp b/src/core/common/CharReader.cpp
index 1a52f53..db9bb2e 100644
--- a/src/core/common/CharReader.cpp
+++ b/src/core/common/CharReader.cpp
@@ -516,10 +516,11 @@ CharReaderFork CharReader::fork()
 	return CharReaderFork(buffer, readCursor, peekCursor, coherent);
 }
 
-TextCursor::Context CharReader::getContext(ssize_t maxSize)
+SourceContext CharReader::getContextAt(ssize_t maxSize,
+                                       Buffer::CursorId referenceCursor)
 {
-	// Clone the current read cursor
-	Buffer::CursorId cur = buffer->createCursor(readCursor.cursor);
+	// Clone the given read cursor
+	Buffer::CursorId cur = buffer->createCursor(referenceCursor);
 
 	// Fetch the start position of the search
 	ssize_t offs = buffer->offset(cur);
@@ -612,8 +613,37 @@ TextCursor::Context CharReader::getContext(ssize_t maxSize)
 	// Delete the newly created cursor
 	buffer->deleteCursor(cur);
 
-	return TextCursor::Context{ss.str(), relPos, !foundBegin || tStart != start,
-	                           !foundEnd || tEnd != end};
+	return SourceContext{ss.str(), relPos, !foundBegin || tStart != start,
+	                     !foundEnd || tEnd != end};
+}
+
+SourceContext CharReader::getContextAtOffs(ssize_t maxSize, size_t offs)
+{
+	// Create a new cursor and calculate how far it has to be moved to reach
+	// the position specified in the location instance
+	Buffer::CursorId cur = buffer->createCursor();
+	ssize_t moveOffs = buffer->offset(cur) - offs;
+
+	// Try to move the cursor to the specified position and read the context
+	SourceContext res;
+	if (buffer->moveCursor(cur, moveOffs) == moveOffs) {
+		res = getContextAt(60, cur);
+	}
+
+	// Delete the read cursor
+	buffer->deleteCursor(cur);
+	return res;
+}
+
+SourceContext CharReader::getContext(ssize_t maxSize)
+{
+	return getContextAt(maxSize, readCursor.cursor);
+}
+
+SourceContext CharReader::contextCallback(const SourceLocation &location,
+                                          void *data)
+{
+	return static_cast<CharReader *>(data)->getContextAtOffs(60, location.offs);
 }
 
 /* Class CharReaderFork */
-- 
cgit v1.2.3