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//
// Copyright (c) 2011 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#ifndef COMPILER_PREPROCESSOR_INPUT_H_
#define COMPILER_PREPROCESSOR_INPUT_H_
namespace pp
{
// Reads the given set of strings into input buffer.
// Strips comments.
class Input
{
public:
Input(int count, const char* const string[], const int length[]);
enum Error
{
kErrorNone,
kErrorUnexpectedEOF
};
Error error() const { return mError; }
// Returns the index of string currently being scanned.
int stringIndex() const { return mIndex; }
// Returns true if EOF has reached.
bool eof() const;
// Reads up to bufSize characters into buf.
// Returns the number of characters read.
// It replaces each comment by a whitespace. It reads only one string
// at a time so that the lexer has opportunity to update the string number
// for meaningful diagnostic messages.
int read(char* buf, int bufSize);
private:
enum State
{
kStateInitial,
kStateLineComment,
kStateBlockComment
};
int getChar();
int peekChar();
// Switches input buffer to the next non-empty string.
// This is called when the current string is fully read.
void switchToNextString();
// Returns true if the given string is empty.
bool isStringEmpty(int index);
// Return the length of the given string.
// Returns a negative value for null-terminated strings.
int stringLength(int index);
// Input.
int mCount;
const char* const* mString;
const int* mLength;
// Current read position.
int mIndex; // Index of string currently being scanned.
int mSize; // Size of string already scanned.
// Current error and state.
Error mError;
State mState;
};
} // namespace pp
#endif // COMPILER_PREPROCESSOR_INPUT_H_
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