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Introduced a backwards scanner for finding expression under cursor

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The backwards scanner lazily tokenizes strings. This optimizes the
common case where scanning one or two lines is enough while at the same
time we extended the limit from 5 to 10 lines.

Reviewed-by: Roberto Raggi
This commit is contained in:
Thorbjørn Lindeijer
2009-05-27 14:32:09 +02:00
parent b93c9ce347
commit 878bc07201
3 changed files with 112 additions and 80 deletions
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10
src/libs/cplusplus/ExpressionUnderCursor.h
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@@ -41,6 +41,7 @@ QT_END_NAMESPACE
namespace CPlusPlus {
class BackwardsScanner;
class SimpleToken;
class CPLUSPLUS_EXPORT ExpressionUnderCursor
@@ -53,13 +54,8 @@ public:
int startOfFunctionCall(const QTextCursor &cursor);
private:
void init(const QTextCursor &cursor,
QList<SimpleToken> *tokens,
QString *text,
int *startPosition = 0);
int startOfMatchingBrace(const QList<SimpleToken> &tk, int index);
int startOfExpression(const QList<SimpleToken> &tk, int index);
int startOfMatchingBrace(BackwardsScanner &tk, int index);
int startOfExpression(BackwardsScanner &tk, int index);
int previousBlockState(const QTextBlock &block);
bool isAccessToken(const SimpleToken &tk);