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indra/llmath/llcalc.cpp

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+/*
+ *  LLCalc.cpp
+ *  SecondLife
+ *
+ *  Created by Aimee Walton on 28/09/2008.
+ *  Copyright 2008 Aimee Walton.
+ *
+ */
+
+#include "linden_common.h"
+
+#include "llcalc.h"
+
+#include "llcalcparser.h"
+#include "llmath.h"
+
+
+// Variable names for use in the build floater
+const char* LLCalc::X_POS = "PX";
+const char* LLCalc::Y_POS = "PY";
+const char* LLCalc::Z_POS = "PZ";
+const char* LLCalc::X_SCALE = "SX";
+const char* LLCalc::Y_SCALE = "SY";
+const char* LLCalc::Z_SCALE = "SZ";
+const char* LLCalc::X_ROT = "RX";
+const char* LLCalc::Y_ROT = "RY";
+const char* LLCalc::Z_ROT = "RZ";
+const char* LLCalc::HOLLOW = "HLW";
+const char* LLCalc::CUT_BEGIN = "CB";
+const char* LLCalc::CUT_END = "CE";
+const char* LLCalc::PATH_BEGIN = "PB";
+const char* LLCalc::PATH_END = "PE";
+const char* LLCalc::TWIST_BEGIN = "TB";
+const char* LLCalc::TWIST_END = "TE";
+const char* LLCalc::X_SHEAR = "SHX";
+const char* LLCalc::Y_SHEAR = "SHY";
+const char* LLCalc::X_TAPER = "TPX";
+const char* LLCalc::Y_TAPER = "TPY";
+const char* LLCalc::RADIUS_OFFSET = "ROF";
+const char* LLCalc::REVOLUTIONS = "REV";
+const char* LLCalc::SKEW = "SKW";
+const char* LLCalc::X_HOLE = "HLX";
+const char* LLCalc::Y_HOLE = "HLY";
+const char* LLCalc::TEX_U_SCALE = "TSU";
+const char* LLCalc::TEX_V_SCALE = "TSV";
+const char* LLCalc::TEX_U_OFFSET = "TOU";
+const char* LLCalc::TEX_V_OFFSET = "TOV";
+const char* LLCalc::TEX_ROTATION = "TROT";
+const char* LLCalc::TEX_TRANSPARENCY = "TRNS";
+const char* LLCalc::TEX_GLOW = "GLOW";
+
+
+LLCalc* LLCalc::sInstance = NULL;
+
+LLCalc::LLCalc() : mLastErrorPos(0)
+{
+//	mUserVariables = new calc_map_t;
+	mVariables = new calc_map_t;
+	mConstants = new calc_map_t;
+		
+	// Init table of constants
+	(*mConstants)["PI"] = F_PI;
+	(*mConstants)["TWO_PI"] = F_TWO_PI;
+	(*mConstants)["PI_BY_TWO"] = F_PI_BY_TWO;
+	(*mConstants)["SQRT2"] = F_SQRT2;
+	(*mConstants)["DEG_TO_RAD"] = DEG_TO_RAD;
+	(*mConstants)["RAD_TO_DEG"] = RAD_TO_DEG;
+	(*mConstants)["GRAVITY"] = GRAVITY;
+}
+
+LLCalc::~LLCalc()
+{
+	delete mConstants;
+	delete mVariables;
+//	delete mUserVariables;	
+}
+
+//static
+void LLCalc::cleanUp()
+{
+	delete sInstance;
+	sInstance = NULL;
+}
+
+//static
+LLCalc* LLCalc::getInstance()
+{
+    if (!sInstance)	sInstance = new LLCalc();
+	return sInstance;
+}
+
+void LLCalc::setVar(const std::string& name, const F32& value)
+{
+	(*mVariables)[name] = value;
+}
+
+void LLCalc::clearVar(const std::string& name)
+{
+	mVariables->erase(name);
+}
+
+void LLCalc::clearAllVariables()
+{
+	mVariables->clear();
+}
+
+/*
+void LLCalc::updateVariables(LLSD& vars)
+{
+	LLSD::map_iterator cIt = vars.beginMap();
+	for(; cIt != vars.endMap(); cIt++)
+	{
+		setVar(cIt->first, (F32)(LLSD::Real)cIt->second);
+	}
+}
+*/
+
+bool LLCalc::evalString(const std::string& expression, F32& result)
+{
+	std::string expr_upper = expression;
+	LLStringUtil::toUpper(expr_upper);
+	
+	LLCalcParser calc(result, mConstants, mVariables);
+
+	mLastErrorPos = 0;
+	std::string::iterator start = expr_upper.begin();
+ 	parse_info<std::string::iterator> info;
+	
+	try
+	{
+		info = parse(start, expr_upper.end(), calc, space_p);
+		lldebugs << "Math expression: " << expression << " = " << result << llendl;
+	}
+	catch(parser_error<std::string, std::string::iterator> &e)
+	{
+		mLastErrorPos = e.where - expr_upper.begin();
+		
+		llinfos << "Calc parser exception: " << e.descriptor << " at " << mLastErrorPos << " in expression: " << expression << llendl;
+		return false;
+	}
+	
+	if (!info.full)
+	{
+		mLastErrorPos = info.stop - expr_upper.begin();
+		llinfos << "Unhandled syntax error at " << mLastErrorPos << " in expression: " << expression << llendl;
+		return false;
+	}
+	
+	return true;
+}