[5.7][SwiftSyntax] Add an API to enable or disable bare slash regex literals from SwiftSyntax

include/swift-c/SyntaxParser/SwiftSyntaxParser.h

@@ -93,6 +93,15 @@ swiftparse_parser_create(void);
 SWIFTPARSE_PUBLIC void
 swiftparse_parser_dispose(swiftparse_parser_t);
 
+/// Set the language version that should be used to parse the Swift source file.
+SWIFTPARSE_PUBLIC void
+swiftparse_parser_set_language_version(swiftparse_parser_t c_parser,
+                                       const char *version);
+
+/// Set whether bare slash regex literals are enabled.
+SWIFTPARSE_PUBLIC void swiftparse_parser_set_enable_bare_slash_regex_literal(
+    swiftparse_parser_t c_parser, bool enabled);
+
 /// Invoked by the parser when a syntax node is parsed. The client should
 /// return a pointer to associate with that particular node.
 typedef swiftparse_client_node_t

test/Syntax/Parser/unterminated_regex.swift

@@ -1,4 +1,4 @@
-// RUN: %swift-syntax-parser-test -dump-diags %s | %FileCheck %s
+// RUN: %swift-syntax-parser-test -dump-diags --swift-version 5 --enable-bare-slash-regex %s | %FileCheck %s
 // CHECK: 6:21 Error: unterminated regex literal
 // CHECK: 1 error(s) 0 warnings(s) 0 note(s)
 

tools/libSwiftSyntaxParser/libSwiftSyntaxParser.cpp

@@ -19,6 +19,7 @@
 #include "swift/AST/Module.h"
 #include "swift/Basic/LangOptions.h"
 #include "swift/Basic/SourceManager.h"
+#include "swift/Basic/Version.h"
 #include "swift/Parse/Parser.h"
 #include "swift/Parse/SyntaxParseActions.h"
 #include "swift/Parse/SyntaxRegexFallbackLexing.h"
@@ -58,6 +59,13 @@ class SynParser {
   swiftparse_node_handler_t NodeHandler = nullptr;
   swiftparse_node_lookup_t NodeLookup = nullptr;
   swiftparse_diagnostic_handler_t DiagHandler = nullptr;
+  /// The language version that should be used to parse the Swift source file.
+  /// If \c None this is the default langauge version specified in LangOptions.h
+  Optional<version::Version> EffectiveLanguageVersion;
+
+  /// Whether bare slash regex literals are enabled.
+  /// If \c None this is the default specified in LangOptions.h
+  Optional<bool> EnableBareSlashRegexLiteral;
 
 public:
   swiftparse_node_handler_t getNodeHandler() const {
@@ -90,6 +98,17 @@ class SynParser {
     Block_release(prevBlk);
   }
 
+  void setLanguageVersion(const char *versionString) {
+    if (auto version = version::Version::parseVersionString(
+            versionString, SourceLoc(), /*Diags=*/nullptr)) {
+      this->EffectiveLanguageVersion = version;
+    }
+  }
+
+  void setEnableBareSlashRegexLiteral(bool EnableBareSlashRegexLiteral) {
+    this->EnableBareSlashRegexLiteral = EnableBareSlashRegexLiteral;
+  }
+
   ~SynParser() {
     setNodeHandler(nullptr);
     setNodeLookup(nullptr);
@@ -493,7 +512,12 @@ swiftparse_client_node_t SynParser::parse(const char *source, size_t len) {
 
   // Always enable bare /.../ regex literal in syntax parser.
   langOpts.EnableExperimentalStringProcessing = true;
-  langOpts.EnableBareSlashRegexLiterals = true;
+  if (EnableBareSlashRegexLiteral && *EnableBareSlashRegexLiteral) {
+    langOpts.EnableBareSlashRegexLiterals = true;
+  }
+  if (EffectiveLanguageVersion) {
+    langOpts.EffectiveLanguageVersion = *EffectiveLanguageVersion;
+  }
 
   auto parseActions =
     std::make_shared<CLibParseActions>(*this, SM, bufID);
@@ -517,6 +541,18 @@ swiftparse_parser_create(void) {
   return new SynParser();
 }
 
+void swiftparse_parser_set_language_version(swiftparse_parser_t c_parser,
+                                            const char *version) {
+  SynParser *parser = static_cast<SynParser *>(c_parser);
+  parser->setLanguageVersion(version);
+}
+
+void swiftparse_parser_set_enable_bare_slash_regex_literal(
+    swiftparse_parser_t c_parser, bool enabled) {
+  SynParser *parser = static_cast<SynParser *>(c_parser);
+  parser->setEnableBareSlashRegexLiteral(enabled);
+}
+
 void
 swiftparse_parser_dispose(swiftparse_parser_t c_parser) {
   SynParser *parser = static_cast<SynParser*>(c_parser);

tools/libSwiftSyntaxParser/libSwiftSyntaxParser.exports

@@ -1,5 +1,7 @@
 swiftparse_parse_string
 swiftparse_parser_create
+swiftparse_parser_set_language_version
+swiftparse_parser_set_enable_bare_slash_regex_literal
 swiftparse_parser_dispose
 swiftparse_parser_set_node_handler
 swiftparse_parser_set_node_lookup

tools/swift-syntax-parser-test/swift-syntax-parser-test.cpp

@@ -54,6 +54,15 @@ Filename(cl::Positional, cl::desc("source file"), cl::Required);
 static cl::opt<unsigned>
 NumParses("n", cl::desc("number of invocations"), cl::init(1));
 
+static cl::opt<std::string>
+    SwiftVersion("swift-version",
+                 cl::desc("Interpret input according to a specific Swift "
+                          "language version number"));
+
+static cl::opt<bool>
+    EnableBareSlashRegex("enable-bare-slash-regex",
+                         cl::desc("Enable or disable the use of forward slash "
+                                  "regular-expression literal syntax"));
 }
 
 namespace {
@@ -136,8 +145,14 @@ makeNode(const swiftparse_syntax_node_t *raw_node, StringRef source) {
 
 static swiftparse_client_node_t
 parse(StringRef source, swiftparse_node_handler_t node_handler,
+      StringRef swift_version, bool enable_bare_slash_regex,
       swiftparse_diagnostic_handler_t diag_handler = nullptr) {
   swiftparse_parser_t parser = swiftparse_parser_create();
+  if (!swift_version.empty()) {
+    swiftparse_parser_set_language_version(parser, swift_version.str().c_str());
+  }
+  swiftparse_parser_set_enable_bare_slash_regex_literal(
+      parser, enable_bare_slash_regex);
   swiftparse_parser_set_node_handler(parser, node_handler);
   swiftparse_parser_set_diagnostic_handler(parser, diag_handler);
   swiftparse_client_node_t top =
@@ -146,13 +161,15 @@ parse(StringRef source, swiftparse_node_handler_t node_handler,
   return top;
 }
 
-static int dumpTree(StringRef source) {
+static int dumpTree(StringRef source, StringRef swiftVersion,
+                    bool enableBareSlashRegex) {
   swiftparse_node_handler_t nodeHandler =
     ^swiftparse_client_node_t(const swiftparse_syntax_node_t *raw_node) {
       return makeNode(raw_node, source);
     };
 
-  std::unique_ptr<SPNode> top = convertClientNode(parse(source, nodeHandler));
+  std::unique_ptr<SPNode> top = convertClientNode(
+      parse(source, nodeHandler, swiftVersion, enableBareSlashRegex));
   top->dump(outs());
 
   return 0;
@@ -217,16 +234,18 @@ static void printDiagInfo(const swiftparser_diagnostic_t diag,
 }
 
 static int dumpDiagnostics(StringRef source, llvm::SourceMgr &SM,
-                           unsigned BufferId) {
+                           unsigned BufferId, StringRef swiftVersion,
+                           bool enableBareSlashRegex) {
   swiftparse_node_handler_t nodeHandler =
   ^swiftparse_client_node_t(const swiftparse_syntax_node_t *raw_node) {
     return makeNode(raw_node, source);
   };
   std::shared_ptr<PrintDiagData> pData = std::make_shared<PrintDiagData>();
-  convertClientNode(parse(source, nodeHandler,
+  convertClientNode(parse(
+      source, nodeHandler, swiftVersion, enableBareSlashRegex,
       ^(const swiftparser_diagnostic_t diag) {
-    printDiagInfo(diag, SM, BufferId, const_cast<PrintDiagData&>(*pData));
-  }));
+        printDiagInfo(diag, SM, BufferId, const_cast<PrintDiagData &>(*pData));
+      }));
   return 0;
 }
 
@@ -255,7 +274,8 @@ static void printTimeRecord(unsigned numInvoks, const TimeRecord &total,
   OS << '\n';
 }
 
-static int timeParsing(StringRef source, unsigned numInvoks) {
+static int timeParsing(StringRef source, unsigned numInvoks,
+                       StringRef swiftVersion, bool enableBareSlashRegex) {
   swiftparse_node_handler_t nodeHandler =
     ^swiftparse_client_node_t(const swiftparse_syntax_node_t *raw_node) {
       return nullptr;
@@ -264,7 +284,7 @@ static int timeParsing(StringRef source, unsigned numInvoks) {
   Timer timer;
   timer.startTimer();
   for (unsigned i = 0; i != numInvoks; ++i) {
-    parse(source, nodeHandler);
+    parse(source, nodeHandler, swiftVersion, enableBareSlashRegex);
   }
   timer.stopTimer();
 
@@ -288,10 +308,13 @@ int main(int argc, char *argv[]) {
   auto BufferId = SM.AddNewSourceBuffer(std::move(*fileBufOrErr), SMLoc());
   switch (options::Action) {
   case ActionType::DumpTree:
-    return dumpTree(source);
+    return dumpTree(source, options::SwiftVersion,
+                    options::EnableBareSlashRegex);
   case ActionType::Time:
-    return timeParsing(source, options::NumParses);
+    return timeParsing(source, options::NumParses, options::SwiftVersion,
+                       options::EnableBareSlashRegex);
   case ActionType::Diagnostics:
-    return dumpDiagnostics(source, SM, BufferId);
+    return dumpDiagnostics(source, SM, BufferId, options::SwiftVersion,
+                           options::EnableBareSlashRegex);
   }
 }