[LyX/master] Improve keyval highlighter

[Juergen Spitzmueller]

commit 9e308ddb0323719152d97371e0ab0ee80c318010
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Tue Jul 18 17:05:56 2023 +0200

     Improve keyval highlighter
---
 src/frontends/qt/LaTeXHighlighter.cpp |   26 ++++++++++++++++----------
 1 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/src/frontends/qt/LaTeXHighlighter.cpp 
b/src/frontends/qt/LaTeXHighlighter.cpp
index 9e24c72..1fa31a1 100644
--- a/src/frontends/qt/LaTeXHighlighter.cpp
+++ b/src/frontends/qt/LaTeXHighlighter.cpp
@@ -44,25 +44,31 @@ LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent, 
bool at_letter, bool
 }
 
 
-void LaTeXHighlighter::highlightBlock(QString const & text_in)
+void LaTeXHighlighter::highlightBlock(QString const & text)
 {
-       QString const text = (optsnippet_) ? '[' + text_in + ']' : text_in;
        // keyval
        if (keyval_) {
                // Highlight key-val options. Used in some option widgets.
-               static const QRegularExpression exprKeyvalkey("[^=,]+");
-               static const QRegularExpression exprKeyvalval("[^,]+");
+               static QRegularExpression exprKeyvalkey("[^=,]+");
+               static QRegularExpression exprKeyvalval("[^,]+");
+               if (optsnippet_) {
+                       static QRegularExpression exprKeyvalkey("^=,+");
+                       static QRegularExpression exprKeyvalval("^,+");
+               }
                QRegularExpressionMatch matchkey = exprKeyvalkey.match(text);
                int kvindex = matchkey.capturedStart(0);
                while (kvindex >= 0) {
                        int length = matchkey.capturedLength(0);
                        setFormat(kvindex, length, keyFormat);
-                       QRegularExpressionMatch matchval =
-                               exprKeyvalval.match(text, kvindex + length);
-                       int kvvindex = matchval.capturedStart(0);
-                       if (kvvindex > 0) {
-                               length += matchval.capturedLength(0);
-                               setFormat(kvvindex, length, valFormat);
+                       if (text.size() > kvindex + length && text.at(kvindex + 
length) == '=') {
+                               QRegularExpressionMatch matchval =
+                                       exprKeyvalval.match(text, kvindex + 
length);
+                               int kvvindex = matchval.capturedStart(0);
+                               if (kvvindex > 0) {
+                                       int vlength = 
matchval.capturedLength(0);
+                                       length += vlength;
+                                       setFormat(kvvindex, vlength, valFormat);
+                               }
                        }
                        matchkey = exprKeyvalkey.match(text, kvindex + length);
                        kvindex = matchkey.capturedStart(0);
-- 
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