diff options
Diffstat (limited to 'liblangutil/SourceLocation.h')
| -rw-r--r-- | liblangutil/SourceLocation.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/liblangutil/SourceLocation.h b/liblangutil/SourceLocation.h index 840891c2..c461909f 100644 --- a/liblangutil/SourceLocation.h +++ b/liblangutil/SourceLocation.h @@ -49,6 +49,26 @@ struct SourceLocation bool isEmpty() const { return start == -1 && end == -1; } + /// @returns the smallest SourceLocation that contains both @param _a and @param _b. + /// Assumes that @param _a and @param _b refer to the same source (exception: if the source of either one + /// is unset, the source of the other will be used for the result, even if that is unset as well). + /// Invalid start and end positions (with value of -1) are ignored (if start or end are -1 for both @param _a and + /// @param _b, then start resp. end of the result will be -1 as well). + static SourceLocation smallestCovering(SourceLocation _a, SourceLocation const& _b) + { + if (!_a.source) + _a.source = _b.source; + + if (_a.start < 0) + _a.start = _b.start; + else if (_b.start >= 0 && _b.start < _a.start) + _a.start = _b.start; + if (_b.end > _a.end) + _a.end = _b.end; + + return _a; + } + int start = -1; int end = -1; std::shared_ptr<CharStream> source; |