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Issue 29333474: Issue 4125 - [emscripten] Convert filter classes to C++ (Closed)
Patch Set: Split up String class into two, cleaned up RegExpFilter methods Created Feb. 4, 2016, 7:20 p.m.
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1 #include "ElemHideBase.h"
2 #include "CSSPropertyFilter.h"
3 #include "StringScanner.h"
4
5 namespace
6 {
7 void NormalizeWhitespace(DependentString& text, String::size_type& domainsEnd,
8 String::size_type& selectorStart)
9 {
10 // For element hiding filters we only want to remove spaces preceding the
11 // selector part. The positions we've determined already have to be adjusted
12 // accordingly.
13
14 String::size_type delta = 0;
15 String::size_type len = text.length();
16
17 // The first character is guaranteed to be a non-space, the string has been
18 // trimmed earlier.
19 for (String::size_type pos = 1; pos < len; pos++)
20 {
21 if (pos == domainsEnd)
22 domainsEnd -= delta;
23
24 // Only spaces before selectorStart position should be removed.
25 if (pos < selectorStart && text[pos] == ' ')
26 delta++;
27 else
28 text[pos - delta] = text[pos];
29 }
30 selectorStart -= delta;
31
32 text.reset(text, 0, len - delta);
33 }
34 }
35
36 ElemHideBase::ElemHideBase(const String& text, const ElemHideBaseData& data)
37 : ActiveFilter(text, false), ElemHideBaseData(data)
38 {
39 if (HasDomains())
40 ParseDomains(GetDomainsSource(mText), u',');
41 }
42
43 Filter::Type ElemHideBase::Parse(DependentString& text, ElemHideData& data)
44 {
45 StringScanner scanner(text);
46
47 // Domains part
48 bool seenSpaces = false;
49 while (!scanner.done())
50 {
51 String::value_type next = scanner.next();
52 if (next == u'#')
53 {
54 data.mDomainsEnd = scanner.position();
55 break;
56 }
57
58 switch (next)
59 {
60 case u'/':
61 case u'*':
62 case u'|':
63 case u'@':
64 case u'"':
65 case u'!':
66 return Type::UNKNOWN;
67 case u' ':
68 seenSpaces = true;
69 break;
70 }
71 }
72
73 seenSpaces |= scanner.skip(u' ');
74 bool exception = scanner.skipOne(u'@');
75 if (exception)
76 seenSpaces |= scanner.skip(u' ');
77
78 String::value_type next = scanner.next();
79 if (next != u'#')
80 return Type::UNKNOWN;
81
82 // Selector part
83
84 // Selector shouldn't be empty
85 seenSpaces |= scanner.skip(u' ');
86 if (scanner.done())
87 return Type::UNKNOWN;
88
89 data.mSelectorStart = scanner.position() + 1;
90 while (!scanner.done())
91 {
92 switch (scanner.next())
93 {
94 case u'{':
95 case u'}':
96 return Type::UNKNOWN;
97 }
98 }
99
100 // We are done validating, now we can normalize whitespace and the domain part
101 if (seenSpaces)
102 NormalizeWhitespace(text, data.mDomainsEnd, data.mSelectorStart);
103 ToLower(text, 0, data.mDomainsEnd);
104
105 if (exception)
106 return Type::ELEMHIDEEXCEPTION;
107
108 do
109 {
110 // Is this a CSS property rule maybe?
111 String searchString(u"[-abp-properties="_str);
112 data.mPrefixEnd = text.find(searchString, data.mSelectorStart);
113 if (data.mPrefixEnd == text.npos ||
114 data.mPrefixEnd + searchString.length() + 1 >= text.length())
115 {
116 break;
117 }
118
119 data.mRegexpStart = data.mPrefixEnd + searchString.length() + 1;
120 char16_t quotation = text[data.mRegexpStart - 1];
121 if (quotation != u'\'' && quotation != u'"')
122 break;
123
124 data.mRegexpEnd = text.find(quotation, data.mRegexpStart);
125 if (data.mRegexpEnd == text.npos || data.mRegexpEnd + 1 >= text.length() ||
126 text[data.mRegexpEnd + 1] != u']')
127 {
128 break;
129 }
130
131 data.mSuffixStart = data.mRegexpEnd + 2;
132 return Type::CSSPROPERTY;
133 } while (false);
134
135 return Type::ELEMHIDE;
136 }
137
138 OwnedString ElemHideBase::GetSelectorDomain() const
139 {
140 /* TODO this is inefficient */
141 OwnedString result;
142 if (mDomains)
143 {
144 for (auto it = mDomains->begin(); it != mDomains->end(); ++it)
145 {
146 if (it->second && !it->first.empty())
147 {
148 if (!result.empty())
149 result.append(u',');
150 result.append(it->first);
151 }
152 }
153 }
154 return std::move(result);
155 }
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