From ff5918808d0a33dda52edf2b429d44b19b4a637d Mon Sep 17 00:00:00 2001
From: nyamatongwe <unknown>
Date: Thu, 22 Jul 2004 01:02:15 +0000
Subject: New method SCI_FINDCOLUMN.

---
 doc/ScintillaDoc.html   | 6 ++++++
 include/Scintilla.h     | 1 +
 include/Scintilla.iface | 4 ++++
 src/Document.cxx        | 2 +-
 src/Editor.cxx          | 3 +++
 5 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/doc/ScintillaDoc.html b/doc/ScintillaDoc.html
index 8cad4e364..7323caa9d 100644
--- a/doc/ScintillaDoc.html
+++ b/doc/ScintillaDoc.html
@@ -898,6 +898,7 @@ struct TextToFind {
      <a class="message" href="#SCI_GETLINEENDPOSITION">SCI_GETLINEENDPOSITION(int line)</a><br />
      <a class="message" href="#SCI_LINELENGTH">SCI_LINELENGTH(int line)</a><br />
      <a class="message" href="#SCI_GETCOLUMN">SCI_GETCOLUMN(int position)</a><br />
+     <a class="message" href="#SCI_FINDCOLUMN">SCI_FINDCOLUMN(int line, int column)</a><br />
      <a class="message" href="#SCI_POSITIONFROMPOINT">SCI_POSITIONFROMPOINT(int x, int y)</a><br />
      <a class="message" href="#SCI_POSITIONFROMPOINTCLOSE">SCI_POSITIONFROMPOINTCLOSE(int x, int
     y)</a><br />
@@ -1226,6 +1227,11 @@ struct TextToFind {
     characters up to the position on the line. In both cases, double byte characters count as a
     single character. This is probably only useful with monospaced fonts.</p>
 
+    <p><b id="SCI_FINDCOLUMN">SCI_FINDCOLUMN(int line, int column)</b><br />
+     This message returns the position of a <code>column</code> on a <code>line</code>
+    taking the width of tabs into account. It treats a multi-byte character as a single column.
+    Column numbers, like lines start at 0.</p>
+
     <p><b id="SCI_POSITIONFROMPOINT">SCI_POSITIONFROMPOINT(int x, int y)</b><br />
      <b id="SCI_POSITIONFROMPOINTCLOSE">SCI_POSITIONFROMPOINTCLOSE(int x, int y)</b><br />
      <code>SCI_POSITIONFROMPOINT</code> finds the closest character position to a point and
diff --git a/include/Scintilla.h b/include/Scintilla.h
index 78f3e093e..f20f0de22 100644
--- a/include/Scintilla.h
+++ b/include/Scintilla.h
@@ -586,6 +586,7 @@ typedef sptr_t (*SciFnDirect)(sptr_t ptr, unsigned int iMessage, uptr_t wParam,
 #define SCI_TARGETASUTF8 2447
 #define SCI_SETLENGTHFORENCODE 2448
 #define SCI_ENCODEDFROMUTF8 2449
+#define SCI_FINDCOLUMN 2456
 #define SCI_STARTRECORD 3001
 #define SCI_STOPRECORD 3002
 #define SCI_SETLEXER 4001
diff --git a/include/Scintilla.iface b/include/Scintilla.iface
index 8fec74f66..d53f9c4e4 100644
--- a/include/Scintilla.iface
+++ b/include/Scintilla.iface
@@ -1595,6 +1595,10 @@ fun void SetLengthForEncode=2448(int bytes,)
 # On error return 0.
 fun int EncodedFromUTF8=2449(string utf8, stringresult encoded)
 
+# Find the position of a column on a line taking into account tabs and 
+# multi-byte characters. If beyond end of line, return line end position.
+fun int FindColumn=2456(int line, int column)
+
 # Start notifying the container of all key presses and commands.
 fun void StartRecord=3001(,)
 
diff --git a/src/Document.cxx b/src/Document.cxx
index 97abd6254..c06397fa8 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -653,7 +653,7 @@ int Document::FindColumn(int line, int column) {
 	int position = LineStart(line);
 	int columnCurrent = 0;
 	if ((line >= 0) && (line < LinesTotal())) {
-		while (columnCurrent < column) {
+		while ((columnCurrent < column) && (position < Length())) {
 			char ch = cb.CharAt(position);
 			if (ch == '\t') {
 				columnCurrent = NextTab(columnCurrent, tabInChars);
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 81cf3bd47..3b16c9783 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -6307,6 +6307,9 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 	case SCI_GETCOLUMN:
 		return pdoc->GetColumn(wParam);
 
+	case SCI_FINDCOLUMN:
+		return pdoc->FindColumn(wParam, lParam);
+
 	case SCI_SETHSCROLLBAR :
 		if (horizontalScrollBarVisible != (wParam != 0)) {
 			horizontalScrollBarVisible = wParam != 0;
-- 
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