Hi! Here's the first test release of the expression evaluator I'm developing for NAnt. I encourage everyone to try it. I'd like to get as much feedback as possible on it.
Please report: 1. Does it work for you? Bug reports are welcome. 2. Is it useful? 3. Do you find the syntax simple enough? Are the build files more/less readable? 4. Does it break your existing build files? (it shouldn't!) 5. What functions/data types/conversions/operators/conversions should be added/removed? 6. What other features would you like to see? Pre-compiled binaries along with patches to current CVS code can be found at: http://jaak.sav.net/nant-ee/nant-ee-test1.zip Changes: * new attribute "test" for <if> and <ifnot> which lets you write: ===================================================== <if test="property1 = property2 + '.txt'"> ... </if> ===================================================== * support for expressions in (hopefully) all places where ${propertyname} syntax could be used: ===================================================== <property name="prop1" value="${'aaa' + 'bbb'}" /> <echo message="length of prop1 is: ${length(prop1)}" if="${1+2=3}" /> ===================================================== Jarek Full list of features: ====================== Data types: integer, double, string, boolean and date Operators: and, or, not =, <>, <, >, <=, >= (because NAnt is XML I'm considering renaming them to lt, gt, le, ge) unary minus, +,-,*,/,%(modulo) with natural precedence, braces (), properties can be accessed just by providing their name Functions: propertyexists(name) - returns true when the property exists, false otherwise propertyvalue(name) - returns the value of the named property, fails when it's not present Conversion operators: int(a) - converts a to integer (if possible) and returns the value double(a) - converts a to double (if possible) and returns the value string(a) - converts a to string and returns the value date(a) - converts a to date bool(a) - converts a to boolean String functions: length(a) - returns the length of the string substring(a,b,c) - equivalent to a.Substring(b,c) in .NET tolower(s) - returns s converted to lower-case toupper(s) - returns s converted to upper-case contains(str,subs) - returns true when subs is a substring of str indexof(a,b) - equivalent to a.IndexOf(b) in .NET padleft(a,b,c) - equivalent to a.PadStart(a,b,c) in .NET padright(a,b,c) - equivalent to a.PadEnd(a,b,c) in .NET trim(a) - equivalent to a.Trim() in .NET trimstart(a) - equivalent to a.TrimStart() in .NET trimend(a) - equivalent to a.TrimEnd() in .NET startswith(a,b) - equivalent to a.StartsWith(b) in .NET endswith(a,b) - equivalent to a.EndsWith(b) in .NET Math functions: round(v) floor(v) ceiling(v) abs(v) File functions: getcreationtime(filename) getlastwritetime(file) getlastaccesstime(file) fileexists(file) filesize(file) Date functions: now() datediff(d1,d2) - returns date difference in seconds dateadd(d1,seconds) - returns d1 + seconds Here are some examples of things that are known to work, taken from my unit tests: Assert("1+2", 3); Assert("1+2+3", 6); Assert("1+2*3", 7); Assert("2*1*3", 6); Assert("1/2+3", 3); Assert("5.0/(2+8)", 0.5); Assert("double(5)/(2+8)", 0.5); Assert("double(1)/2+3", 3.5); Assert("((((1))))", 1); Assert("((((1+2))))", 3); Assert("((((1+2)+(2+1))))", 6); Assert("((((1+2)/(2+1))))", 1); Assert("length('')", 0); Assert("length('')=0", true); Assert("length('')=1", false); Assert("length('test')", 4); Assert("length('test')=4", true); Assert("length('test')=5", false); Assert("length('d''Artagnan')", 10); Assert("length('d''Artagnan')=10", true); Assert("length('d''Artagnan')=11", false); Assert("-1", -1); Assert("--1", 1); Assert("'a' = 'a'", true); Assert("'a' = 'b'", false); Assert("'a' <> 'a'", false); Assert("'a' <> 'b'", true); Assert("1 = 1", true); Assert("1 <> 1", false); Assert("1 = 2", false); Assert("1 <> 2", true); Assert("1.0 = 1.0", true); Assert("1.0 <> 1.0", false); Assert("1.0 = 2.0", false); Assert("1.0 <> 2.0", true); Assert("true", true); Assert("false", false); Assert("true==true", true); Assert("true==false", false); Assert("true<>false", true); Assert("true<>true", false); Assert("!true", false); Assert("!false", true); Assert("!(1=1)", false); Assert("substring('abcde',1,2)='bc'", true); Assert("trim(' ab ')='ab'", true); Assert("trimstart(' ab ')='ab '", true); Assert("trimend(' ab ')=' ab'", true); Assert("padleft('ab',5,'.')='...ab'", true); Assert("padright('ab',5,'.')='ab...'", true); Assert("indexof('abc','c')=2", true); Assert("indexof('abc','d')=-1", true); Assert("indexof('abc','d')=-1", true); Assert("round(0.1)", 0.0); Assert("round(0.7)", 1.0); Assert("floor(0.1)", 0.0); Assert("floor(0.7)", 0.0); Assert("ceiling(0.1)", 1.0); Assert("ceiling(0.7)", 1.0); Assert("if(true,1,2)", 1); Assert("if(true,'a','b')", "a"); Assert("if(false,'a','b')", "b"); Assert("abs(1)", 1.0); Assert("abs(-1)", 1.0); Assert("fileexists('c:\\notthere.txt')", false); Assert("dateadd(somedate,3600) = someotherdate", true); Assert("'a' + 'b' = 'ab'", true); ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. 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