From 957e37fbf232090178f07ea9afc5facfcfb5a76b Mon Sep 17 00:00:00 2001
From: Brian Ferguson <ferguson.brian@gmail.com>
Date: Sat, 4 Jan 2014 09:06:07 -0700
Subject: [PATCH] Added [Measure:EscapeRegExp] section variable for measures.
 This will escape any regular expression meta-characters for use with IfMatch.

---
 Library/ConfigParser.cpp | 51 +++++++++++++++++++++++++++++++++++++++-
 Library/ConfigParser.h   |  2 ++
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/Library/ConfigParser.cpp b/Library/ConfigParser.cpp
index 166a7ca6..20052a7c 100644
--- a/Library/ConfigParser.cpp
+++ b/Library/ConfigParser.cpp
@@ -230,12 +230,14 @@ bool ConfigParser::GetSectionVariable(std::wstring& strVariable, std::wstring& s
 	// Percentual: [Measure:%], [Measure:%, dec]
 	// Scale: [Measure:/scale], [Measure:/scale, dec]
 	// Max/Min: [Measure:MaxValue], [Measure:MaxValue:/scale, dec] ('%' cannot be used)
+	// EscapeRegExp: [Measure:EscapeRegExp] (Escapes regular expression syntax, used for 'IfMatch')
 	enum VALUETYPE
 	{
 		RAW        = 0,
 		PERCENTUAL = 1,
 		MAX        = 2,
-		MIN        = 3
+		MIN        = 3,
+		SPECIAL    = 4
 	} valueType = RAW;
 
 	if (isKeySelector)
@@ -248,6 +250,10 @@ bool ConfigParser::GetSectionVariable(std::wstring& strVariable, std::wstring& s
 		{
 			valueType = MIN;
 		}
+		else if (_wcsicmp(selectorSz, L"EscapeRegExp") == 0)
+		{
+			valueType = SPECIAL;
+		}
 		else
 		{
 			return false;
@@ -287,6 +293,19 @@ bool ConfigParser::GetSectionVariable(std::wstring& strVariable, std::wstring& s
 	Measure* measure = m_MeterWindow->GetMeasure(strVariable);
 	if (measure)
 	{
+		if (valueType == SPECIAL)  // "Special" functions: EscapeRegExp
+		{
+			if (_wcsicmp(selector.c_str(), L"EscapeRegExp") == 0)
+			{
+				std::wstring str = measure->GetStringValue();
+				EscapeRegExp(str);
+				strValue.assign(str);
+			}
+			//else if (_wcsicmp(selector.c_str(), L"") == 0)
+
+			return true;
+		}
+
 		int scale = 1;
 
 		const WCHAR* decimalsSz = wcschr(selectorSz, L',');
@@ -364,6 +383,36 @@ bool ConfigParser::GetSectionVariable(std::wstring& strVariable, std::wstring& s
 	return false;
 }
 
+/*
+** Used to escape regular expression metacharacters for use in IfMatch
+**
+*/
+void ConfigParser::EscapeRegExp(std::wstring& str)
+{
+	auto replace = [&str](WCHAR reservedChar)
+	{
+		size_t start = 0;
+		while ((start = str.find(reservedChar, start)) != std::wstring::npos)
+		{
+			str.insert(start, L"\\");
+			start += 2;
+		}
+	};
+
+	replace(L'\\');
+	replace(L'^');
+	replace(L'$');
+	replace(L'|');
+	replace(L'(');
+	replace(L')');
+	replace(L'[');
+	replace(L'{');
+	replace(L'.');
+	replace(L'+');
+	replace(L'*');
+	replace(L'?');
+}
+
 void ConfigParser::ResetMonitorVariables(MeterWindow* meterWindow)
 {
 	// Set the SCREENAREA/WORKAREA variables
diff --git a/Library/ConfigParser.h b/Library/ConfigParser.h
index d8c6d54a..589c254b 100644
--- a/Library/ConfigParser.h
+++ b/Library/ConfigParser.h
@@ -110,6 +110,8 @@ private:
 
 	bool GetSectionVariable(std::wstring& strVariable, std::wstring& strValue);
 
+	void EscapeRegex(std::wstring& str);
+
 	static void SetVariable(std::unordered_map<std::wstring, std::wstring>& variables, const std::wstring& strVariable, const std::wstring& strValue);
 	static void SetVariable(std::unordered_map<std::wstring, std::wstring>& variables, const WCHAR* strVariable, const WCHAR* strValue);