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// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcrt/css/cfx_cssvaluelistparser.h"
#include "core/fxcrt/fx_extension.h"
CFX_CSSValueListParser::CFX_CSSValueListParser(const wchar_t* psz,
int32_t iLen,
wchar_t separator)
: m_Separator(separator), m_pCur(psz), m_pEnd(psz + iLen) {
ASSERT(psz && iLen > 0);
}
bool CFX_CSSValueListParser::NextValue(CFX_CSSPrimitiveType& eType,
const wchar_t*& pStart,
int32_t& iLength) {
while (m_pCur < m_pEnd && (*m_pCur <= ' ' || *m_pCur == m_Separator))
++m_pCur;
if (m_pCur >= m_pEnd)
return false;
eType = CFX_CSSPrimitiveType::Unknown;
pStart = m_pCur;
iLength = 0;
wchar_t wch = *m_pCur;
if (wch == '#') {
iLength = SkipTo(' ', false, false);
if (iLength == 4 || iLength == 7)
eType = CFX_CSSPrimitiveType::RGB;
} else if (std::iswdigit(wch) || wch == '.' || wch == '-' || wch == '+') {
while (m_pCur < m_pEnd && (*m_pCur > ' ' && *m_pCur != m_Separator))
++m_pCur;
iLength = m_pCur - pStart;
eType = CFX_CSSPrimitiveType::Number;
} else if (wch == '\"' || wch == '\'') {
pStart++;
m_pCur++;
iLength = SkipTo(wch, false, false);
m_pCur++;
eType = CFX_CSSPrimitiveType::String;
} else if (m_pEnd - m_pCur > 5 && m_pCur[3] == '(') {
if (FXSYS_wcsnicmp(L"rgb", m_pCur, 3) == 0) {
iLength = SkipTo(')', false, false) + 1;
m_pCur++;
eType = CFX_CSSPrimitiveType::RGB;
}
} else {
iLength = SkipTo(m_Separator, true, true);
eType = CFX_CSSPrimitiveType::String;
}
return m_pCur <= m_pEnd && iLength > 0;
}
int32_t CFX_CSSValueListParser::SkipTo(wchar_t wch,
bool breakOnSpace,
bool matchBrackets) {
const wchar_t* pStart = m_pCur;
int32_t bracketCount = 0;
while (m_pCur < m_pEnd && *m_pCur != wch) {
if (breakOnSpace && *m_pCur <= ' ')
break;
if (!matchBrackets) {
m_pCur++;
continue;
}
if (*m_pCur == '(')
bracketCount++;
else if (*m_pCur == ')')
bracketCount--;
m_pCur++;
}
while (bracketCount > 0 && m_pCur < m_pEnd) {
if (*m_pCur == ')')
bracketCount--;
m_pCur++;
}
return m_pCur - pStart;
}
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