5 files changed, 123 insertions, 0 deletions
diff --git a/src/support/CMakeLists.txt b/src/support/CMakeLists.txt
index 13bf463e4..54ee7b206 100644
--- a/src/support/CMakeLists.txt
+++ b/src/support/CMakeLists.txt
@@ -9,8 +9,10 @@ set(support_SOURCES
   file.cpp
   istring.cpp
   json.cpp
+  name.cpp
   path.cpp
   safe_integer.cpp
+  string.cpp
   threads.cpp
   utilities.cpp
   ${support_HEADERS}
diff --git a/src/support/name.cpp b/src/support/name.cpp
new file mode 100644
index 000000000..4e53e3f83
--- /dev/null
+++ b/src/support/name.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2024 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <algorithm>
+#include <array>
+
+#include "support/name.h"
+#include "support/string.h"
+
+namespace wasm {
+
+// TODO: Use unicode rather than char.
+bool Name::isIDChar(char c) {
+  if ('0' <= c && c <= '9') {
+    return true;
+  }
+  if ('A' <= c && c <= 'Z') {
+    return true;
+  }
+  if ('a' <= c && c <= 'z') {
+    return true;
+  }
+  static std::array<char, 23> otherIDChars = {
+    {'!', '#', '$', '%', '&', '\'', '*', '+', '-', '.', '/', ':',
+     '<', '=', '>', '?', '@', '\\', '^', '_', '`', '|', '~'}};
+  return std::find(otherIDChars.begin(), otherIDChars.end(), c) !=
+         otherIDChars.end();
+}
+
+std::ostream& Name::print(std::ostream& o) const {
+  assert(*this && "Cannot print an empty name");
+  // We need to quote names if they have tricky chars.
+  // TODO: This is not spec-compliant since the spec does not yet support
+  // quoted identifiers and has a limited set of valid idchars.
+  o << '$';
+  if (std::all_of(str.begin(), str.end(), isIDChar)) {
+    return o << str;
+  } else {
+    return String::printEscaped(o, str);
+  }
+}
+
+} // namespace wasm
diff --git a/src/support/name.h b/src/support/name.h
index a22461d5d..8e3f7a291 100644
--- a/src/support/name.h
+++ b/src/support/name.h
@@ -58,6 +58,11 @@ struct Name : public IString {
     // TODO: Use C++23 `contains`.
     return str.find(substring.str) != std::string_view::npos;
   }
+
+  std::ostream& print(std::ostream& o) const;
+
+private:
+  static bool isIDChar(char c);
 };
 
 } // namespace wasm
diff --git a/src/support/string.cpp b/src/support/string.cpp
new file mode 100644
index 000000000..c7f8a5ff6
--- /dev/null
+++ b/src/support/string.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2024 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ostream>
+
+#include "support/string.h"
+
+namespace wasm::String {
+
+std::ostream& printEscaped(std::ostream& os, std::string_view str) {
+  os << '"';
+  for (unsigned char c : str) {
+    switch (c) {
+      case '\t':
+        os << "\\t";
+        break;
+      case '\n':
+        os << "\\n";
+        break;
+      case '\r':
+        os << "\\r";
+        break;
+      case '"':
+        os << "\\\"";
+        break;
+      case '\'':
+        os << "\\'";
+        break;
+      case '\\':
+        os << "\\\\";
+        break;
+      default: {
+        if (c >= 32 && c < 127) {
+          os << c;
+        } else {
+          os << std::hex << '\\' << (c / 16) << (c % 16) << std::dec;
+        }
+      }
+    }
+  }
+  return os << '"';
+}
+
+} // namespace wasm::String
diff --git a/src/support/string.h b/src/support/string.h
index 751efdac5..6fe3faf60 100644
--- a/src/support/string.h
+++ b/src/support/string.h
@@ -24,6 +24,7 @@
 #include "support/utilities.h"
 #include <algorithm>
 #include <cctype>
+#include <ostream>
 #include <string>
 #include <vector>
 
@@ -152,6 +153,8 @@ inline bool isNumber(const std::string& str) {
   return !str.empty() && std::all_of(str.begin(), str.end(), ::isdigit);
 }
 
+std::ostream& printEscaped(std::ostream& os, std::string_view str);
+
 } // namespace wasm::String
 
 #endif // wasm_support_string_h