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Issue 29333474: Issue 4125 - [emscripten] Convert filter classes to C++ (Closed)
Patch Set: Created Jan. 14, 2016, 4:40 p.m.
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1 #include "ElemHideBase.h"
2 #include "ElemHideFilter.h"
3 #include "ElemHideException.h"
4 #include "tools.h"
5
6 class Scanner
7 {
8 private:
9 const std::u16string& str;
10 size_t pos;
11 size_t end;
12 public:
13 Scanner(const std::u16string& str) : str(str), pos(0), end(str.length()) {}
14
15 bool done()
16 {
17 return pos >= end;
18 }
19
20 size_t position()
21 {
22 return pos - 1;
23 }
24
25 char16_t next()
26 {
27 return done() ? u'\0' : str[pos++];
28 }
29 };
30
31 ElemHideBase::ElemHideBase(const std::u16string& text, size_t domainsEnd, size_t selectorStart)
32 : ActiveFilter(text)
33 {
34 }
35
36 Filter::Type ElemHideBase::Parse(const std::u16string& text, size_t* domainsEnd, size_t* selectorStart)
37 {
38 Scanner scanner(text);
39
40 // Domains part
41 loop:
42 while (!scanner.done())
43 {
44 char16_t next = scanner.next();
45 if (next == u'#')
46 {
47 *domainsEnd = scanner.position();
48 break;
49 }
50
51 switch (next)
52 {
53 case u'/':
54 case u'*':
55 case u'|':
56 case u'@':
57 case u'"':
58 case u'!':
59 return Type::UNKNOWN;
60 }
61 }
62
63 bool exception = false;
64 char16_t next = scanner.next();
65 if (next == u'@')
66 {
67 exception = true;
68 next = scanner.next();
69 }
70
71 if (next != u'#')
72 return Type::UNKNOWN;
73
74 // Selector part
75
76 // Selector shouldn't be empty
77 if (scanner.done())
78 return Type::UNKNOWN;
79
80 *selectorStart = scanner.position() + 1;
81 while (!scanner.done())
82 {
83 switch (scanner.next())
84 {
85 case u'{':
86 case u'}':
87 return Type::UNKNOWN;
88 }
89 }
90
91 return exception ? Type::ELEMHIDEEXCEPTION : Type::ELEMHIDE;
92 }
93
94 ElemHideBase* ElemHideBase::Create(const std::u16string& text)
95 {
96 size_t domainsEnd;
97 size_t selectorStart;
98 Type type = Parse(text, &domainsEnd, &selectorStart);
99 if (type == Type::UNKNOWN)
100 return nullptr;
101 else if (type == Type::ELEMHIDEEXCEPTION)
102 return new ElemHideException(text, domainsEnd, selectorStart);
103 else
104 return new ElemHideFilter(text, domainsEnd, selectorStart);
105 }
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