Config flag

Author: ShortDevelopment

lib/Common/ConfigFlagsList.h

@@ -673,6 +673,7 @@ PHASE(All)
 #define DEFAULT_CONFIG_ESArrayFindFromLast     (true)
 #define DEFAULT_CONFIG_ESPromiseAny            (true)
 #define DEFAULT_CONFIG_ESNullishCoalescingOperator (true)
+#define DEFAULT_CONFIG_ESOptionalChaining      (true)
 #define DEFAULT_CONFIG_ESGlobalThis            (true)
 
 // Jitting generators has not been tested on ARM
@@ -1199,6 +1200,9 @@ FLAGR(Boolean, ESNumericSeparator, "Enable Numeric Separator flag", DEFAULT_CONF
 // ES Nullish coalescing operator support (??)
 FLAGR(Boolean, ESNullishCoalescingOperator, "Enable nullish coalescing operator", DEFAULT_CONFIG_ESNullishCoalescingOperator)
 
+// ES Optional chaining operator support (?.)
+FLAGR(Boolean, ESOptionalChaining, "Enable optional chaining operator", DEFAULT_CONFIG_ESOptionalChaining)
+
 // ES Hashbang support for interpreter directive syntax
 FLAGR(Boolean, ESHashbang, "Enable Hashbang syntax", DEFAULT_CONFIG_ESHashbang)
 

lib/Parser/Scan.cpp

@@ -1781,7 +1781,7 @@ tokens Scanner<EncodingPolicy>::ScanCore(bool identifyKwds)
                 token = tkCoalesce;
                 break;
             }
-            else if (this->PeekFirst(p, last) == '.') // ToDo: Config flag for optional chaining?!
+            else if (m_scriptContext->GetConfig()->IsESOptionalChainingEnabled() && this->PeekFirst(p, last) == '.')
             {
                 p++;
                 token = tkOptChain;

lib/Runtime/Base/ThreadConfigFlagsList.h

@@ -45,6 +45,7 @@ FLAG_RELEASE(IsESBigIntEnabled, ESBigInt)
 FLAG_RELEASE(IsESNumericSeparatorEnabled, ESNumericSeparator)
 FLAG_RELEASE(IsESHashbangEnabled, ESHashbang)
 FLAG_RELEASE(IsESNullishCoalescingOperatorEnabled, ESNullishCoalescingOperator)
+FLAG_RELEASE(IsESOptionalChainingEnabled, ESOptionalChaining)
 FLAG_RELEASE(IsESExportNsAsEnabled, ESExportNsAs)
 FLAG_RELEASE(IsESSymbolDescriptionEnabled, ESSymbolDescription)
 FLAG_RELEASE(IsESPromiseAnyEnabled, ESPromiseAny)