1// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//    http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#ifndef COMPILER_PREPROCESSOR_INPUT_H_
16#define COMPILER_PREPROCESSOR_INPUT_H_
17
18#include <cstddef>
19#include <vector>
20#include <climits>
21
22namespace pp
23{
24
25// Holds and reads input for Lexer.
26class Input
27{
28public:
29	Input();
30	~Input();
31	Input(size_t count, const char *const string[], const int length[]);
32
33	size_t count() const { return mCount; }
34	const char *string(size_t index) const { return mString[index]; }
35	size_t length(size_t index) const { return mLength[index]; }
36
37	size_t read(char *buf, size_t maxSize, int *lineNo);
38
39	struct Location
40	{
41		size_t sIndex;  // String index;
42		size_t cIndex;  // Char index.
43
44		Location() : sIndex(0), cIndex(0) {}
45	};
46	const Location &readLoc() const { return mReadLoc; }
47
48private:
49	// Skip a character and return the next character after the one that was skipped.
50	// Return nullptr if data runs out.
51	const char *skipChar();
52
53	// Input.
54	size_t mCount;
55	const char *const *mString;
56	std::vector<size_t> mLength;
57
58	Location mReadLoc;
59};
60
61}  // namespace pp
62#endif  // COMPILER_PREPROCESSOR_INPUT_H_
63
64