[clang-tidy] convert member functions to static

Found with readability-convert-member-functions-to-static

Signed-off-by: Rosen Penev <rosenp@gmail.com>

include/yaml-cpp/emitter.h

@@ -126,7 +126,6 @@ class YAML_CPP_API Emitter {
 
   const char* ComputeFullBoolName(bool b) const;
   const char* ComputeNullName() const;
-  bool CanEmitNewline() const;
 
  private:
   std::unique_ptr<EmitterState> m_pState;

src/emitter.cpp

@@ -269,8 +269,6 @@ void Emitter::EmitNewline() {
   m_pState->SetNonContent();
 }
 
-bool Emitter::CanEmitNewline() const { return true; }
-
 // Put the stream in a state so we can simply write the next node
 // E.g., if we're in a sequence, write the "- "
 void Emitter::PrepareNode(EmitterNodeType::value child) {

src/scanner.cpp

@@ -7,6 +7,19 @@
 #include "yaml-cpp/exceptions.h"  // IWYU pragma: keep
 
 namespace YAML {
+namespace {
+// IsWhitespaceToBeEaten
+// . We can eat whitespace if it's a space or tab
+// . Note: originally tabs in block context couldn't be eaten
+//         "where a simple key could be allowed
+//         (i.e., not at the beginning of a line, or following '-', '?', or
+// ':')"
+//   I think this is wrong, since tabs can be non-content whitespace; it's just
+//   that they can't contribute to indentation, so once you've seen a tab in a
+//   line, you can't start a simple key
+bool IsWhitespaceToBeEaten(char ch) { return (ch == ' ') || (ch == '\t'); }
+}  // namespace
+
 Scanner::Scanner(std::istream& in)
     : INPUT(in),
       m_tokens{},
@@ -213,27 +226,6 @@ void Scanner::ScanToNextToken() {
 ///////////////////////////////////////////////////////////////////////
 // Misc. helpers
 
-// IsWhitespaceToBeEaten
-// . We can eat whitespace if it's a space or tab
-// . Note: originally tabs in block context couldn't be eaten
-//         "where a simple key could be allowed
-//         (i.e., not at the beginning of a line, or following '-', '?', or
-// ':')"
-//   I think this is wrong, since tabs can be non-content whitespace; it's just
-//   that they can't contribute to indentation, so once you've seen a tab in a
-//   line, you can't start a simple key
-bool Scanner::IsWhitespaceToBeEaten(char ch) {
-  if (ch == ' ') {
-    return true;
-  }
-
-  if (ch == '\t') {
-    return true;
-  }
-
-  return false;
-}
-
 const RegEx& Scanner::GetValueRegex() const {
   if (InBlockContext()) {
     return Exp::Value();
@@ -269,7 +261,7 @@ Token* Scanner::PushToken(Token::TYPE type) {
   return &m_tokens.back();
 }
 
-Token::TYPE Scanner::GetStartTokenFor(IndentMarker::INDENT_TYPE type) const {
+Token::TYPE Scanner::GetStartTokenFor(IndentMarker::INDENT_TYPE type) {
   switch (type) {
     case IndentMarker::SEQ:
       return Token::BLOCK_SEQ_START;

src/scanner.h

@@ -90,7 +90,7 @@ class Scanner {
   bool InBlockContext() const { return m_flows.empty(); }
   std::size_t GetFlowLevel() const { return m_flows.size(); }
 
-  Token::TYPE GetStartTokenFor(IndentMarker::INDENT_TYPE type) const;
+  static Token::TYPE GetStartTokenFor(IndentMarker::INDENT_TYPE type);
 
   /**
    * Pushes an indentation onto the stack, and enqueues the proper token
@@ -131,8 +131,6 @@ class Scanner {
    */
   void ThrowParserException(const std::string &msg) const;
 
-  bool IsWhitespaceToBeEaten(char ch);
-
   /**
    * Returns the appropriate regex to check if the next token is a value token.
    */