1 // Copyright 2017 PDFium 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 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6 
7 #include "core/fxcrt/css/cfx_cssvaluelistparser.h"
8 
9 #include "core/fxcrt/fx_extension.h"
10 
CFX_CSSValueListParser(const wchar_t * psz,int32_t iLen,wchar_t separator)11 CFX_CSSValueListParser::CFX_CSSValueListParser(const wchar_t* psz,
12                                                int32_t iLen,
13                                                wchar_t separator)
14     : m_Separator(separator), m_pCur(psz), m_pEnd(psz + iLen) {
15   ASSERT(psz);
16   ASSERT(iLen > 0);
17 }
18 
NextValue(CFX_CSSPrimitiveType * eType,const wchar_t ** pStart,int32_t * iLength)19 bool CFX_CSSValueListParser::NextValue(CFX_CSSPrimitiveType* eType,
20                                        const wchar_t** pStart,
21                                        int32_t* iLength) {
22   while (m_pCur < m_pEnd && (*m_pCur <= ' ' || *m_pCur == m_Separator))
23     ++m_pCur;
24 
25   if (m_pCur >= m_pEnd)
26     return false;
27 
28   *eType = CFX_CSSPrimitiveType::Unknown;
29   *pStart = m_pCur;
30   *iLength = 0;
31   wchar_t wch = *m_pCur;
32   if (wch == '#') {
33     *iLength = SkipTo(' ', false, false);
34     if (*iLength == 4 || *iLength == 7)
35       *eType = CFX_CSSPrimitiveType::RGB;
36   } else if (FXSYS_IsDecimalDigit(wch) || wch == '.' || wch == '-' ||
37              wch == '+') {
38     while (m_pCur < m_pEnd && (*m_pCur > ' ' && *m_pCur != m_Separator))
39       ++m_pCur;
40 
41     *iLength = m_pCur - *pStart;
42     *eType = CFX_CSSPrimitiveType::Number;
43   } else if (wch == '\"' || wch == '\'') {
44     ++(*pStart);
45     m_pCur++;
46     *iLength = SkipTo(wch, false, false);
47     m_pCur++;
48     *eType = CFX_CSSPrimitiveType::String;
49   } else if (m_pEnd - m_pCur > 5 && m_pCur[3] == '(') {
50     if (FXSYS_wcsnicmp(L"rgb", m_pCur, 3) == 0) {
51       *iLength = SkipTo(')', false, false) + 1;
52       m_pCur++;
53       *eType = CFX_CSSPrimitiveType::RGB;
54     }
55   } else {
56     *iLength = SkipTo(m_Separator, true, true);
57     *eType = CFX_CSSPrimitiveType::String;
58   }
59   return m_pCur <= m_pEnd && *iLength > 0;
60 }
61 
SkipTo(wchar_t wch,bool breakOnSpace,bool matchBrackets)62 int32_t CFX_CSSValueListParser::SkipTo(wchar_t wch,
63                                        bool breakOnSpace,
64                                        bool matchBrackets) {
65   const wchar_t* pStart = m_pCur;
66   int32_t bracketCount = 0;
67   while (m_pCur < m_pEnd && *m_pCur != wch) {
68     if (breakOnSpace && *m_pCur <= ' ')
69       break;
70     if (!matchBrackets) {
71       m_pCur++;
72       continue;
73     }
74 
75     if (*m_pCur == '(')
76       bracketCount++;
77     else if (*m_pCur == ')')
78       bracketCount--;
79 
80     m_pCur++;
81   }
82 
83   while (bracketCount > 0 && m_pCur < m_pEnd) {
84     if (*m_pCur == ')')
85       bracketCount--;
86     m_pCur++;
87   }
88   return m_pCur - pStart;
89 }
90