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 && iLen > 0);
16 }
17
NextValue(CFX_CSSPrimitiveType * eType,const wchar_t ** pStart,int32_t * iLength)18 bool CFX_CSSValueListParser::NextValue(CFX_CSSPrimitiveType* eType,
19 const wchar_t** pStart,
20 int32_t* iLength) {
21 while (m_pCur < m_pEnd && (*m_pCur <= ' ' || *m_pCur == m_Separator))
22 ++m_pCur;
23
24 if (m_pCur >= m_pEnd)
25 return false;
26
27 *eType = CFX_CSSPrimitiveType::Unknown;
28 *pStart = m_pCur;
29 *iLength = 0;
30 wchar_t wch = *m_pCur;
31 if (wch == '#') {
32 *iLength = SkipTo(' ', false, false);
33 if (*iLength == 4 || *iLength == 7)
34 *eType = CFX_CSSPrimitiveType::RGB;
35 } else if (std::iswdigit(wch) || wch == '.' || wch == '-' || wch == '+') {
36 while (m_pCur < m_pEnd && (*m_pCur > ' ' && *m_pCur != m_Separator))
37 ++m_pCur;
38
39 *iLength = m_pCur - *pStart;
40 *eType = CFX_CSSPrimitiveType::Number;
41 } else if (wch == '\"' || wch == '\'') {
42 ++(*pStart);
43 m_pCur++;
44 *iLength = SkipTo(wch, false, false);
45 m_pCur++;
46 *eType = CFX_CSSPrimitiveType::String;
47 } else if (m_pEnd - m_pCur > 5 && m_pCur[3] == '(') {
48 if (FXSYS_wcsnicmp(L"rgb", m_pCur, 3) == 0) {
49 *iLength = SkipTo(')', false, false) + 1;
50 m_pCur++;
51 *eType = CFX_CSSPrimitiveType::RGB;
52 }
53 } else {
54 *iLength = SkipTo(m_Separator, true, true);
55 *eType = CFX_CSSPrimitiveType::String;
56 }
57 return m_pCur <= m_pEnd && *iLength > 0;
58 }
59
SkipTo(wchar_t wch,bool breakOnSpace,bool matchBrackets)60 int32_t CFX_CSSValueListParser::SkipTo(wchar_t wch,
61 bool breakOnSpace,
62 bool matchBrackets) {
63 const wchar_t* pStart = m_pCur;
64 int32_t bracketCount = 0;
65 while (m_pCur < m_pEnd && *m_pCur != wch) {
66 if (breakOnSpace && *m_pCur <= ' ')
67 break;
68 if (!matchBrackets) {
69 m_pCur++;
70 continue;
71 }
72
73 if (*m_pCur == '(')
74 bracketCount++;
75 else if (*m_pCur == ')')
76 bracketCount--;
77
78 m_pCur++;
79 }
80
81 while (bracketCount > 0 && m_pCur < m_pEnd) {
82 if (*m_pCur == ')')
83 bracketCount--;
84 m_pCur++;
85 }
86 return m_pCur - pStart;
87 }
88