systool source code, he can resolve the value of the expression, you can also custom functions (with up to 3 parameters), the custom variable. Useful, no need to install a direct quote

Systoolsource\COM\LicenceCode\STCOMLic.pas
.............\...\...........\STGenLIC.pas
.............\...\...........\vssver.scc
.............\...\SysTools.dll
.............\...\systools.dpr
.............\...\SysTools.res
.............\...\SysTools.tlb
.............\...\SysTools_TLB.pas
.............\...\vssver.scc
.............\...\_StAstro.pas
.............\...\_StBase.pas
.............\...\_StCRC.pas
.............\...\_StDate.pas
.............\...\_StEclipses.pas
.............\...\_StExpr.pas
.............\...\_StFin.pas
.............\...\_StRegEx.pas
.............\...\_StRegINI.pas
.............\...\_StStat.pas
.............\...\_StString.pas
.............\...\_StToHTML.pas
.............\...\_StUtil.pas
.............\kwbuildr.txt
.............\kwpascal.txt
.............\St2DBarC.pas
.............\StAbout0.dfm
.............\StAbout0.pas
.............\StAstro.pas
.............\StAstroP.pas
.............\StBarC.pas
.............\StBarPN.pas
.............\StBase.dcu
.............\StBase.pas
.............\StBCD.pas
.............\StBits.pas
.............\stccy.dat
.............\stccycnv.dat
.............\StColl.pas
.............\StConst.dcu
.............\StConst.pas
.............\StCRC.pas
.............\StDate.dcu
.............\StDate.pas
.............\StDateSt.pas
.............\StDb2DBC.pas
.............\StDbBarC.pas
.............\StDbPNBC.pas
.............\StDecMth.pas
.............\StDefine.inc
.............\StDict.pas
.............\StDque.pas
.............\StEclpse.pas
.............\StExpEng.pas
.............\StExpLog.pas
.............\StExport.pas
.............\StExpr.dcu
.............\StExpr.pas
.............\StExpr.txt
.............\StFin.pas
.............\StFirst.pas
.............\StGenLog.pas
.............\StHASH.pas
.............\StIniStm.pas
.............\StJup.pas
.............\StJupSat.pas
.............\StLArr.pas
.............\StList.pas
.............\StMars.pas
.............\StMath.dcu
.............\StMath.pas
.............\StMerc.pas
.............\StMerge.pas
.............\StMime.pas
.............\StMoney.pas
.............\StNeptun.pas
.............\StNet.pas
.............\StNetApi.pas
.............\StNetCon.pas
.............\StNetMsg.pas
.............\StNetPfm.pas
.............\StNTLog.pas
.............\StNVBits.pas
.............\StNVColl.pas
.............\StNVCont.pas
.............\StNVDict.pas
.............\StNVDQ.pas
.............\StNVLAry.pas
.............\StNVList.pas
.............\StNVLMat.pas
.............\StNVSCol.pas
.............\StNVTree.pas
.............\StOStr.pas
.............\StPluto.pas
.............\StPQueue.pas
.............\StPropEd.pas
.............\StPtrns.pas
.............\StRandom.pas
.............\StReg.pas
.............\streg.r32
.............\StReg.rc

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