110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
/*
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* Copyright (C) 2009-2014 Max Kellermann <max@duempel.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TOKENIZER_HXX
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#define TOKENIZER_HXX
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class Error;
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class Tokenizer {
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char *input;
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public:
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/**
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* @param _input the input string; the contents will be
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* modified by this class
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*/
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constexpr Tokenizer(char *_input):input(_input) {}
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Tokenizer(const Tokenizer &) = delete;
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Tokenizer &operator=(const Tokenizer &) = delete;
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char *Rest() {
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return input;
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}
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char CurrentChar() const {
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return *input;
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}
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bool IsEnd() const {
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return CurrentChar() == 0;
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}
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/**
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* Reads the next word.
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*
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* @param error if this function returns nullptr and
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* **input_p!=0, it provides an #Error object in
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* this argument
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* @return a pointer to the null-terminated word, or nullptr
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* on error or end of line
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*/
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char *NextWord(Error &error);
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/**
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* Reads the next unquoted word from the input string.
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*
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* @param error_r if this function returns nullptr and **input_p!=0, it
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* provides an #Error object in this argument
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* @return a pointer to the null-terminated word, or nullptr
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* on error or end of line
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*/
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char *NextUnquoted(Error &error);
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/**
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* Reads the next quoted string from the input string. A backslash
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* escapes the following character. This function modifies the input
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* string.
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*
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* @param input_p the input string; this function returns a pointer to
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* the first non-whitespace character of the following token
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* @param error_r if this function returns nullptr and **input_p!=0, it
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* provides an #Error object in this argument
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* @return a pointer to the null-terminated string, or nullptr on error
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* or end of line
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*/
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char *NextString(Error &error);
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/**
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* Reads the next unquoted word or quoted string from the
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* input. This is a wrapper for NextUnquoted() and
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* NextString().
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*
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* @param error_r if this function returns nullptr and
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* **input_p!=0, it provides an #Error object in
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* this argument
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* @return a pointer to the null-terminated string, or nullptr
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* on error or end of line
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*/
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char *NextParam(Error &error);
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};
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#endif
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