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| 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 WebCore { |
| 11 |
| 12 MediaQueryInputStream::MediaQueryInputStream(String input) |
| 13 : m_offset(0) |
| 14 , m_string(input) |
| 15 { |
| 16 } |
| 17 |
| 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 |
| 26 void MediaQueryInputStream::advance(unsigned offset) |
| 27 { |
| 28 ASSERT(m_offset + offset <= maxLength()); |
| 29 m_offset += offset; |
| 30 } |
| 31 |
| 32 void MediaQueryInputStream::pushBack(UChar cc) |
| 33 { |
| 34 --m_offset; |
| 35 ASSERT(currentInputChar() == cc); |
| 36 } |
| 37 |
| 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 |
| 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 + star
t, end - start, &isResultOK); |
| 60 else |
| 61 result = charactersToDouble(m_string.characters16() + m_offset + sta
rt, end - start, &isResultOK); |
| 62 } |
| 63 return isResultOK ? result : 0.0; |
| 64 } |
| 65 |
| 66 } // namespace WebCore |
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