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Issue 29333474: Issue 4125 - [emscripten] Convert filter classes to C++ (Closed)
Patch Set: Optimized hash lookup performance a bit Created Feb. 8, 2016, 7:11 p.m.
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1 #pragma once
2
3 #include "String.h"
4
5 class StringScanner
6 {
7 private:
8 const String mStr;
9 String::size_type mPos;
10 String::size_type mEnd;
11 String::value_type mTerminator;
12 public:
13 StringScanner(const String& str, String::size_type pos = 0,
14 String::value_type terminator = u'\0')
15 : mStr(str), mPos(pos), mEnd(str.length()), mTerminator(terminator) {}
16
17 bool done()
18 {
19 return mPos >= mEnd;
20 }
21
22 String::size_type position()
23 {
24 return mPos - 1;
25 }
26
27 String::value_type next()
28 {
29 String::value_type result = done() ? mTerminator : mStr[mPos];
30 mPos++;
31 return result;
32 }
33
34 bool skipOne(String::value_type ch)
35 {
36 if (!done() && mStr[mPos] == ch)
37 {
38 mPos++;
39 return true;
40 }
41
42 return false;
43 }
44
45 bool skip(String::value_type ch)
46 {
47 String::size_type oldPos = mPos;
48 while (!done() && mStr[mPos] == ch)
49 mPos++;
50 return oldPos != mPos;
51 }
52 };
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