platform_system_core/init/parser/tokenizer.h
Lee Campbell 220ca84223 init: Add C++ tokenizer.
Adds a C++ tokenizer along with unit tests.

This tokenizer will replace the current C implementation
which does a poor job of keeping track of pointers.

This CL is a prerequisite for up coming changes to
the parser. This CL does not wire up this tokenizer and
changes no exsiting code. All that builds is the unit tests.

Change-Id: Iec3740bce7153640adc5e5bbdc57e644cedf0038
TEST: Unit tests all pass. No leaks under valgrind
BUG: 22843198
2015-07-30 18:45:17 +00:00

69 lines
1.9 KiB
C++

// Copyright (C) 2015 The Android Open Source Project
//
// 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 <string>
namespace init {
// Used to tokenize a std::string.
// Call Next() to advance through each token until it returns false,
// indicating there are no more tokens left in the string.
// The current token can be accessed with current(), which returns
// a Token.
// Supported tokens are:
// TOK_START - Next() has yet to be called
// TOK_END - At the end of string
// TOK_NEWLINE - The end of a line denoted by \n.
// TOK_TEXT - A word.
// Comments are denoted with '#' and the tokenizer will ignore
// the rest of the line.
// Double quotes can be used to insert whitespace into words.
// A backslash at the end of a line denotes continuation and
// a TOK_NEWLINE will not be generated for that line.
class Tokenizer {
public:
Tokenizer(const std::string& data);
~Tokenizer();
enum TokenType { TOK_START, TOK_END, TOK_NEWLINE, TOK_TEXT };
struct Token {
TokenType type;
std::string text;
};
// Returns the curret token.
const Token& current();
// Move to the next token, returns false at the end of input.
bool Next();
private:
void GetData();
void AdvChar();
void AdvText();
void AdvUntil(char x);
void AdvWhiteSpace();
void StartText();
void EndText();
const std::string& data_;
Token current_;
bool eof_;
size_t pos_;
char cur_char_;
size_t tok_start_;
};
} // namespace init