This source file includes following definitions.
- scan
- scan
- scanRun
- skipRun
- extractString
- restOfInputAsString
- scanDigits
- scanFloat
#include "config.h"
#include "core/html/track/vtt/VTTScanner.h"
namespace WebCore {
VTTScanner::VTTScanner(const String& line) : m_is8Bit(line.is8Bit())
{
if (m_is8Bit) {
m_data.characters8 = line.characters8();
m_end.characters8 = m_data.characters8 + line.length();
} else {
m_data.characters16 = line.characters16();
m_end.characters16 = m_data.characters16 + line.length();
}
}
bool VTTScanner::scan(char c)
{
if (!match(c))
return false;
advance();
return true;
}
bool VTTScanner::scan(const LChar* characters, size_t charactersCount)
{
unsigned matchLength = m_is8Bit ? m_end.characters8 - m_data.characters8 : m_end.characters16 - m_data.characters16;
if (matchLength < charactersCount)
return false;
bool matched;
if (m_is8Bit)
matched = WTF::equal(m_data.characters8, characters, charactersCount);
else
matched = WTF::equal(m_data.characters16, characters, charactersCount);
if (matched)
advance(charactersCount);
return matched;
}
bool VTTScanner::scanRun(const Run& run, const String& toMatch)
{
ASSERT(run.start() == position());
ASSERT(run.start() <= end());
ASSERT(run.end() >= run.start());
ASSERT(run.end() <= end());
size_t matchLength = run.length();
if (toMatch.length() > matchLength)
return false;
bool matched;
if (m_is8Bit)
matched = WTF::equal(toMatch.impl(), m_data.characters8, matchLength);
else
matched = WTF::equal(toMatch.impl(), m_data.characters16, matchLength);
if (matched)
seekTo(run.end());
return matched;
}
void VTTScanner::skipRun(const Run& run)
{
ASSERT(run.start() <= end());
ASSERT(run.end() >= run.start());
ASSERT(run.end() <= end());
seekTo(run.end());
}
String VTTScanner::extractString(const Run& run)
{
ASSERT(run.start() == position());
ASSERT(run.start() <= end());
ASSERT(run.end() >= run.start());
ASSERT(run.end() <= end());
String s;
if (m_is8Bit)
s = String(m_data.characters8, run.length());
else
s = String(m_data.characters16, run.length());
seekTo(run.end());
return s;
}
String VTTScanner::restOfInputAsString()
{
Run rest(position(), end(), m_is8Bit);
return extractString(rest);
}
unsigned VTTScanner::scanDigits(int& number)
{
Run runOfDigits = collectWhile<isASCIIDigit>();
if (runOfDigits.isEmpty()) {
number = 0;
return 0;
}
bool validNumber;
size_t numDigits = runOfDigits.length();
if (m_is8Bit)
number = charactersToInt(m_data.characters8, numDigits, &validNumber);
else
number = charactersToInt(m_data.characters16, numDigits, &validNumber);
if (!validNumber)
number = std::numeric_limits<int>::max();
seekTo(runOfDigits.end());
return numDigits;
}
bool VTTScanner::scanFloat(float& number)
{
Run integerRun = collectWhile<isASCIIDigit>();
seekTo(integerRun.end());
Run decimalRun(position(), position(), m_is8Bit);
if (scan('.')) {
decimalRun = collectWhile<isASCIIDigit>();
seekTo(decimalRun.end());
}
if (integerRun.isEmpty() && decimalRun.isEmpty()) {
seekTo(integerRun.start());
return false;
}
size_t lengthOfFloat = Run(integerRun.start(), position(), m_is8Bit).length();
bool validNumber;
if (m_is8Bit)
number = charactersToFloat(integerRun.start(), lengthOfFloat, &validNumber);
else
number = charactersToFloat(reinterpret_cast<const UChar*>(integerRun.start()), lengthOfFloat, &validNumber);
if (!validNumber)
number = std::numeric_limits<float>::max();
return true;
}
}