1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "config.h"
6 #include "core/css/parser/MediaQueryInputStream.h"
7
8 #include "core/html/parser/InputStreamPreprocessor.h"
9
10 namespace blink {
11
MediaQueryInputStream(String input)12 MediaQueryInputStream::MediaQueryInputStream(String input)
13 : m_offset(0)
14 , m_string(input)
15 {
16 }
17
peek(unsigned lookaheadOffset)18 UChar MediaQueryInputStream::peek(unsigned lookaheadOffset)
19 {
20 ASSERT((m_offset + lookaheadOffset) <= maxLength());
21 if ((m_offset + lookaheadOffset) >= m_string.length())
22 return kEndOfFileMarker;
23 return m_string[m_offset + lookaheadOffset];
24 }
25
advance(unsigned offset)26 void MediaQueryInputStream::advance(unsigned offset)
27 {
28 ASSERT(m_offset + offset <= maxLength());
29 m_offset += offset;
30 }
31
pushBack(UChar cc)32 void MediaQueryInputStream::pushBack(UChar cc)
33 {
34 --m_offset;
35 ASSERT(nextInputChar() == cc);
36 }
37
getUInt(unsigned start,unsigned end)38 unsigned long long MediaQueryInputStream::getUInt(unsigned start, unsigned end)
39 {
40 ASSERT(start <= end && ((m_offset + end) <= m_string.length()));
41 bool isResultOK = false;
42 unsigned long long result = 0;
43 if (start < end) {
44 if (m_string.is8Bit())
45 result = charactersToUInt64Strict(m_string.characters8() + m_offset + start, end - start, &isResultOK);
46 else
47 result = charactersToUInt64Strict(m_string.characters16() + m_offset + start, end - start, &isResultOK);
48 }
49 return isResultOK ? result : 0;
50 }
51
getDouble(unsigned start,unsigned end)52 double MediaQueryInputStream::getDouble(unsigned start, unsigned end)
53 {
54 ASSERT(start <= end && ((m_offset + end) <= m_string.length()));
55 bool isResultOK = false;
56 double result = 0.0;
57 if (start < end) {
58 if (m_string.is8Bit())
59 result = charactersToDouble(m_string.characters8() + m_offset + start, end - start, &isResultOK);
60 else
61 result = charactersToDouble(m_string.characters16() + m_offset + start, end - start, &isResultOK);
62 }
63 return isResultOK ? result : 0.0;
64 }
65
66 } // namespace blink
67