Beginnings of a debugger wire protocol

runtime/vm/json.h

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#ifndef VM_JSON_H_
-#define VM_JSON_H_
-
-#include "vm/allocation.h"
-#include "vm/globals.h"
-
-namespace dart {
-
-
-// A low level interface to tokenize JSON strings.
-class JSONScanner : ValueObject {
- public:
-  enum Token {
-    TokenIllegal = 0,
-    TokenLBrace,
-    TokenRBrace,
-    TokenLBrack,
-    TokenRBrack,
-    TokenColon,
-    TokenComma,
-    TokenString,
-    TokenInteger,
-    TokenTrue,
-    TokenFalse,
-    TokenNull,
-    TokenEOM
-  };
-  explicit JSONScanner(const char* json_text);
-
-  void SetText(const char* json_text);
-  void Scan();
-  Token CurrentToken() const { return token_; }
-  bool EOM() const { return token_ == TokenEOM; }
-  const char* TokenChars() const { return token_start_; }
-  int TokenLen() const { return token_length_; }
-  bool IsStringLiteral(const char* literal) const;
-  void Skip(Token matching_token);
-
- private:
-  bool IsLetter(char ch) const;
-  bool IsDigit(char ch) const;
-  bool IsLiteral(const char* literal);
-  void ScanNumber();
-  void ScanString();
-  void Recognize(Token t);
-
-  const char* current_pos_;
-  const char* token_start_;
-  int token_length_;
-  Token token_;
-};
-
-
-// JSONReader is a higher level interface that allows for lookup of
-// name-value pairs in JSON objects.
-class JSONReader : ValueObject {
- public:
-  enum JSONType {
-    kString,
-    kInteger,
-    kObject,
-    kArray,
-    kLiteral,
-    kNone
-  };
-
-  explicit JSONReader(const char* json_object);
-  void Set(const char* json_object);
-
-  // Returns true if a pair with the given name was found.
-  bool Seek(const char* name);
-
-  // Returns true if a syntax error was found.
-  bool Error() const { return error_; }
-
-  JSONType Type() const;
-  const char* ValueChars() const {
-    return (Type() != kNone) ? scanner_.TokenChars() : NULL;
-  }
-  int ValueLen() const {
-    return (Type() != kNone) ? scanner_.TokenLen() : 0;
-  }
-  bool IsStringLiteral(const char* literal) const {
-    return scanner_.IsStringLiteral(literal);
-  }
-  bool IsTrue() const {
-    return scanner_.CurrentToken() == JSONScanner::TokenTrue;
-  }
-  bool IsFalse() const {
-    return scanner_.CurrentToken() == JSONScanner::TokenFalse;
-  }
-  bool IsNull() const {
-    return scanner_.CurrentToken() == JSONScanner::TokenNull;
-  }
-
- private:
-  JSONScanner scanner_;
-  const char* json_object_;
-  bool error_;
-};
-
-
-// TextBuffer maintains a dynamic character buffer with a printf-style way to
-// append text.
-class TextBuffer : ValueObject {
- public:
-  explicit TextBuffer(intptr_t buf_size);
-  ~TextBuffer();
-
-  intptr_t Printf(const char* format, ...);
-  void Clear();
-
-  char* buf() { return buf_; }
-
- private:
-  void GrowBuffer(intptr_t len);
-  char* buf_;
-  intptr_t buf_size_;
-  intptr_t msg_len_;
-};
-
-}  // namespace dart
-
-#endif  // VM_JSON_H_