blob: 694c3bda83e07d34269d73d7ed468862c087367a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
//
// 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.
//
#include "Input.h"
#include <cstdio>
#include "compiler/debug.h"
namespace pp
{
Input::Input(int count, const char* const string[], const int length[])
: mCount(count),
mString(string),
mLength(length),
mIndex(-1),
mSize(0),
mError(kErrorNone),
mState(kStateInitial)
{
ASSERT(mCount >= 0);
switchToNextString();
}
bool Input::eof() const
{
ASSERT(mIndex <= mCount);
return mIndex == mCount;
}
int Input::read(char* buf, int bufSize)
{
int nread = 0;
int startIndex = mIndex;
// Keep reading until the buffer is full or the current string is exhausted.
while ((mIndex == startIndex) && (nread < bufSize))
{
int c = getChar();
if (c == EOF)
{
if (mState == kStateBlockComment)
mError = kErrorUnexpectedEOF;
break;
}
switch (mState)
{
case kStateInitial:
if (c == '/')
{
// Potentially a comment.
switch (peekChar())
{
case '/':
getChar(); // Eat '/'.
mState = kStateLineComment;
break;
case '*':
getChar(); // Eat '*'.
mState = kStateBlockComment;
break;
default:
// Not a comment.
buf[nread++] = c;
break;
}
} else
{
buf[nread++] = c;
}
break;
case kStateLineComment:
if (c == '\n')
{
buf[nread++] = c;
mState = kStateInitial;
}
break;
case kStateBlockComment:
if (c == '*' && (peekChar() == '/'))
{
getChar(); // Eat '/'.
buf[nread++] = ' '; // Replace comment with whitespace.
mState = kStateInitial;
} else if (c == '\n')
{
// Line breaks are never skipped.
buf[nread++] = c;
}
break;
default:
ASSERT(false);
break;
}
}
return nread;
}
int Input::getChar()
{
if (eof()) return EOF;
const char* str = mString[mIndex];
int c = str[mSize++];
// Switch to next string if the current one is fully read.
int length = stringLength(mIndex);
// We never read from empty string.
ASSERT(length != 0);
if (((length < 0) && (str[mSize] == '\0')) ||
((length > 0) && (mSize == length)))
switchToNextString();
return c;
}
int Input::peekChar()
{
// Save the current read position.
int index = mIndex;
int size = mSize;
int c = getChar();
// Restore read position.
mIndex = index;
mSize = size;
return c;
}
void Input::switchToNextString()
{
ASSERT(mIndex < mCount);
mSize = 0;
do
{
++mIndex;
} while (!eof() && isStringEmpty(mIndex));
}
bool Input::isStringEmpty(int index)
{
ASSERT(index < mCount);
const char* str = mString[mIndex];
int length = stringLength(mIndex);
return (length == 0) || ((length < 0) && (str[0] == '\0'));
}
int Input::stringLength(int index)
{
ASSERT(index < mCount);
return mLength ? mLength[index] : -1;
}
} // namespace pp
|
