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| 1 #include "ElemHideBase.h" |
| 2 #include "ElemHideFilter.h" |
| 3 #include "ElemHideException.h" |
| 4 #include "CSSPropertyFilter.h" |
| 5 #include "InvalidFilter.h" |
| 6 #include "StringScanner.h" |
| 7 |
| 8 ElemHideBase::ElemHideBase(const std::u16string& text, |
| 9 const std::u16string& domains, const std::u16string& selector) |
| 10 : ActiveFilter(text, false), selector(selector) |
| 11 { |
| 12 if (!domains.empty()) |
| 13 ParseDomains(domains, u','); |
| 14 } |
| 15 |
| 16 Filter::Type ElemHideBase::Parse(const std::u16string& text, size_t* domainsEnd, |
| 17 size_t* selectorStart, size_t* prefixEnd, size_t* regexpStart, |
| 18 size_t* regexpEnd, size_t* suffixStart) |
| 19 { |
| 20 StringScanner scanner(text); |
| 21 |
| 22 // Domains part |
| 23 loop: |
| 24 while (!scanner.done()) |
| 25 { |
| 26 char16_t next = scanner.next(); |
| 27 if (next == u'#') |
| 28 { |
| 29 *domainsEnd = scanner.position(); |
| 30 break; |
| 31 } |
| 32 |
| 33 switch (next) |
| 34 { |
| 35 case u'/': |
| 36 case u'*': |
| 37 case u'|': |
| 38 case u'@': |
| 39 case u'"': |
| 40 case u'!': |
| 41 return Type::UNKNOWN; |
| 42 } |
| 43 } |
| 44 |
| 45 bool exception = false; |
| 46 char16_t next = scanner.next(); |
| 47 if (next == u'@') |
| 48 { |
| 49 exception = true; |
| 50 next = scanner.next(); |
| 51 } |
| 52 |
| 53 if (next != u'#') |
| 54 return Type::UNKNOWN; |
| 55 |
| 56 // Selector part |
| 57 |
| 58 // Selector shouldn't be empty |
| 59 if (scanner.done()) |
| 60 return Type::UNKNOWN; |
| 61 |
| 62 *selectorStart = scanner.position() + 1; |
| 63 while (!scanner.done()) |
| 64 { |
| 65 switch (scanner.next()) |
| 66 { |
| 67 case u'{': |
| 68 case u'}': |
| 69 return Type::UNKNOWN; |
| 70 } |
| 71 } |
| 72 |
| 73 if (exception) |
| 74 return Type::ELEMHIDEEXCEPTION; |
| 75 |
| 76 do |
| 77 { |
| 78 // Is this a CSS property rule maybe? |
| 79 if (!prefixEnd) |
| 80 { |
| 81 // Caller doesn't care |
| 82 break; |
| 83 } |
| 84 |
| 85 const std::u16string searchString(u"[-abp-properties="); |
| 86 *prefixEnd = text.find(searchString, *selectorStart); |
| 87 if (*prefixEnd == text.npos || |
| 88 *prefixEnd + searchString.length() + 1 >= text.length()) |
| 89 { |
| 90 break; |
| 91 } |
| 92 |
| 93 *regexpStart = *prefixEnd + searchString.length() + 1; |
| 94 char16_t quotation = text[*regexpStart - 1]; |
| 95 if (quotation != u'\'' && quotation != u'"') |
| 96 break; |
| 97 |
| 98 *regexpEnd = text.find(quotation, *regexpStart); |
| 99 if (*regexpEnd == text.npos || *regexpEnd + 1 >= text.length() || |
| 100 text[*regexpEnd + 1] != u']') |
| 101 { |
| 102 break; |
| 103 } |
| 104 |
| 105 *suffixStart = *regexpEnd + 2; |
| 106 return Type::CSSPROPERTY; |
| 107 } while (false); |
| 108 |
| 109 return Type::ELEMHIDE; |
| 110 } |
| 111 |
| 112 Filter* ElemHideBase::Create(const std::u16string& text) |
| 113 { |
| 114 size_t domainsEnd; |
| 115 size_t selectorStart; |
| 116 size_t prefixEnd; |
| 117 size_t regexpStart; |
| 118 size_t regexpEnd; |
| 119 size_t suffixStart; |
| 120 Type type = Parse(text, &domainsEnd, &selectorStart, &prefixEnd, ®expStart, |
| 121 ®expEnd, &suffixStart); |
| 122 if (type == Type::UNKNOWN) |
| 123 return nullptr; |
| 124 |
| 125 try |
| 126 { |
| 127 std::u16string domains(text.substr(0, domainsEnd)); |
| 128 std::u16string selector(text.substr(selectorStart)); |
| 129 if (type == Type::ELEMHIDEEXCEPTION) |
| 130 return new ElemHideException(text, domains, selector); |
| 131 else if (type == Type::CSSPROPERTY) |
| 132 { |
| 133 std::u16string prefix(text.substr(selectorStart, prefixEnd - selectorStart
)); |
| 134 std::u16string regexpSource(text.substr(regexpStart, regexpEnd - regexpSta
rt)); |
| 135 std::u16string suffix(text.substr(suffixStart)); |
| 136 return new CSSPropertyFilter(text, domains, selector, regexpSource, prefix
, |
| 137 suffix); |
| 138 } |
| 139 else |
| 140 return new ElemHideFilter(text, domains, selector); |
| 141 } |
| 142 catch (const std::u16string& e) |
| 143 { |
| 144 return new InvalidFilter(text, e); |
| 145 } |
| 146 } |
| 147 |
| 148 const std::u16string ElemHideBase::GetSelectorDomain() const |
| 149 { |
| 150 std::u16string result; |
| 151 for (auto it = domains.begin(); it != domains.end(); ++it) |
| 152 { |
| 153 if (it->second && !it->first.empty()) |
| 154 { |
| 155 if (!result.empty()) |
| 156 result.append(u","); |
| 157 result.append(it->first); |
| 158 } |
| 159 } |
| 160 return result; |
| 161 } |
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