LanguageClient: add support for proposed semantic highlight

implements the current proposal for the semantic highlighting
via the language server protocol.
https://github.com/microsoft/vscode-languageserver-node/pull/367

Change-Id: I857d606fcf5c782e0ea8e18e5d098edd26286aed
Reviewed-by: Nikolai Kosjar <[email protected]>

1 files changed, 56 insertions, 0 deletions

diff --git a/src/libs/languageserverprotocol/languagefeatures.cpp b/src/libs/languageserverprotocol/languagefeatures.cpp
index cfb4cc6fabd..f66b6b7e164 100644
--- a/src/libs/languageserverprotocol/languagefeatures.cpp
+++ b/src/libs/languageserverprotocol/languagefeatures.cpp
@@ -48,6 +48,7 @@ constexpr const char DocumentRangeFormattingRequest::methodName[];
 constexpr const char DocumentOnTypeFormattingRequest::methodName[];
 constexpr const char RenameRequest::methodName[];
 constexpr const char SignatureHelpRequest::methodName[];
+constexpr const char SemanticHighlightNotification::methodName[];
 
 HoverContent LanguageServerProtocol::Hover::content() const
 {
@@ -441,4 +442,59 @@ bool CodeAction::isValid(QStringList *error) const
            && checkOptional<Command>(error, commandKey);
 }
 
+Utils::optional<QList<SemanticHighlightToken>> SemanticHighlightingInformation::tokens() const
+{
+    QList<SemanticHighlightToken> resultTokens;
+
+    const QByteArray tokensByteArray = QByteArray::fromBase64(
+        typedValue<QString>(tokensKey).toLocal8Bit());
+    constexpr int tokensByteSize = 8;
+    int index = 0;
+    while (index + tokensByteSize <= tokensByteArray.size()) {
+        resultTokens << SemanticHighlightToken(tokensByteArray.mid(index, tokensByteSize));
+        index += tokensByteSize;
+    }
+    return Utils::make_optional(resultTokens);
+}
+
+void SemanticHighlightingInformation::setTokens(const QList<SemanticHighlightToken> &tokens)
+{
+    QByteArray byteArray;
+    byteArray.reserve(8 * tokens.size());
+    for (const SemanticHighlightToken &token : tokens)
+        token.appendToByteArray(byteArray);
+    insert(tokensKey, QString::fromLocal8Bit(byteArray.toBase64()));
+}
+
+SemanticHighlightToken::SemanticHighlightToken(const QByteArray &token)
+{
+    QTC_ASSERT(token.size() == 8, return );
+    character = ( quint32(token.at(0)) << 24
+                | quint32(token.at(1)) << 16
+                | quint32(token.at(2)) << 8
+                | quint32(token.at(3)));
+
+    length = quint16(token.at(4) << 8 | token.at(5));
+
+    scope = quint16(token.at(6) << 8 | token.at(7));
+}
+
+void SemanticHighlightToken::appendToByteArray(QByteArray &byteArray) const
+{
+    byteArray.append(char((character & 0xff000000) >> 24));
+    byteArray.append(char((character & 0x00ff0000) >> 16));
+    byteArray.append(char((character & 0x0000ff00) >> 8));
+    byteArray.append(char((character & 0x000000ff)));
+    byteArray.append(char((length & 0xff00) >> 8));
+    byteArray.append(char((length & 0x00ff)));
+    byteArray.append(char((scope & 0xff00) >> 8));
+    byteArray.append(char((scope & 0x00ff)));
+}
+
+bool SemanticHighlightingParams::isValid(QStringList *error) const
+{
+    return check<VersionedTextDocumentIdentifier>(error, textDocumentKey)
+            && checkArray<SemanticHighlightingInformation>(error, linesKey);
+}
+
 } // namespace LanguageServerProtocol