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Unified Diff: compiled/StringScanner.h

Issue 29333474: Issue 4125 - [emscripten] Convert filter classes to C++ (Closed)
Patch Set: Addressed comments from Patch Set 26 Created March 13, 2017, 5:36 p.m.
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Index: compiled/StringScanner.h
===================================================================
new file mode 100644
--- /dev/null
+++ b/compiled/StringScanner.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include "String.h"
+
+class StringScanner
+{
+private:
+ const DependentString mStr;
+ String::size_type mPos;
+ String::size_type mEnd;
+ String::value_type mTerminator;
+public:
+ explicit StringScanner(const String& str, String::size_type pos = 0,
+ String::value_type terminator = u'\0')
+ : mStr(str), mPos(pos), mEnd(str.length()), mTerminator(terminator) {}
+
+ const bool done()
+ {
+ return mPos >= mEnd;
+ }
+
+ const String::size_type position()
+ {
+ return mPos - 1;
+ }
+
+ String::value_type next()
+ {
+ String::value_type result = done() ? mTerminator : mStr[mPos];
+ mPos++;
+ return result;
+ }
+
+ bool skipOne(String::value_type ch)
+ {
+ if (!done() && mStr[mPos] == ch)
+ {
+ mPos++;
+ return true;
+ }
+
+ return false;
+ }
+
+ bool skip(String::value_type ch)
+ {
+ bool skipped = false;
+ while ((skipped = skipOne(ch)));
+ return skipped;
+ }
+};
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