This looks like a good idea. I'll think about it:
We could have:
<echo message="aaa ${length('aaa')}" if="someproperty" />
<echo message="aaa ${length('aaa')}" if="length(someproperty) = 3" />
<if test="contains(nant.settings.currentframework.description,
'Microsoft')">
<echo message="We're running on Microsoft!" />
</if>
But it may break some build scripts which use "length" and similar keywords
as property names. What should we do then?
Also, since we use XML, there's a problem with <, <=, >, and >= operators
which need to be written as < > which isn't very readable. Shouldn't
we call the operators "lt", "le", "gt", "ge" (less than, less or equal,
greater than, greater or equal) adding "eq" (for equality) and "ne" (for
not-equality) ??? Or should we allow for both forms?
This way you could have:
<echo message="aaa" if="'aaa' eq someproperty" />
Shoud unary boolean negation be "not" or "!"?
Should binary boolean operators be "and", "or" or "||", "&&" (&&) in
XML)
I'm awaiting your opinions.
Jarek
----- Original Message -----
From: "Martin Aliger" <[EMAIL PROTECTED]>
To: "Jaroslaw Kowalski" <[EMAIL PROTECTED]>; "Ian MacLean"
<[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Tuesday, December 02, 2003 3:44 PM
Subject: Re: [nant-dev] PATCH: Expression evaluator for NAnt
> Sounds good!
>
> embedded expression should maybe use ${...} syntax unless we could break
> some existing buildfiles.
>
> how property expansion works together with expressions?
>
> e.g.:
> does <echo message="the length of the file is: %{filelength(${filename})}"
> />work
> or should I write <echo message="the length of the file is:
> %{filelength('${filename}')}" /> ?
>
> Maybe, if expressions could use properties directly as variables there
could
> be more straightforward
> %{filelength(filename)} or even with begining ${ to be compatible.
> ${property} than will be property or expression which is the same in that
> case.
>
> Martin
>
> ----- Original Message -----
> From: "Jaroslaw Kowalski" <[EMAIL PROTECTED]>
> To: "Martin Aliger" <[EMAIL PROTECTED]>; "Ian MacLean"
> <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Tuesday, December 02, 2003 3:27 PM
> Subject: Re: [nant-dev] PATCH: Expression evaluator for NAnt
>
>
> > It's not in yet, but I'm working on adding this to NAnt (startswith and
> > endswith will be there, too). Some preliminary version should be
available
> > before this weekend in a separate branch of NAnt.
> >
> > Expression evaluation will be supported in almost all places where you
can
> > specify in NAnt. So instead of:
> >
> > <echo message="aaaa" if="true" />
> >
> > you will be able to write:
> >
> > <echo message="aaaa" if="startswith('aaaa','a')" />
> >
> > This will work in for all attributes where non-string values are
expected
> > (if, timeout, unless, failonerror, verbose, and all task-specific
> attributes
> > like debug,optimize,etc.).
> >
> > For strings, I'm planning to provide embedded expressions, like:
> >
> > <echo message="the length of the file is: %{filelength(${filename})}" />
> >
> > What do you think?
> >
> > Jarek
> >
> > ----- Original Message -----
> > From: "Martin Aliger" <[EMAIL PROTECTED]>
> > To: "Ian MacLean" <[EMAIL PROTECTED]>; "Jaroslaw Kowalski"
> > <[EMAIL PROTECTED]>
> > Cc: <[EMAIL PROTECTED]>
> > Sent: Tuesday, December 02, 2003 2:26 PM
> > Subject: Re: [nant-dev] PATCH: Expression evaluator for NAnt
> >
> >
> > > Great! Superb! Maybe I'd love to see startwith and endwith string
> > functions
> > > in addition, but great start as Ian said :)
> > >
> > > Is it in already?
> > >
> > > I tried: [with nant-20031128]
> > > <foreach item="String" in="${changes}" delim=" " property="folder">
> > > <property name="name" value="${folder}.dll"/>
> > > <if test="indexof('.Test.dll','${name}'==0">
> > > ...
> > >
> > > and no luck :( :
> > >
> > > BUILD FAILED
> > >
> > > C:\temp\server\GINIS.NET.build(84,5):
> > > [if] at least one if condition must be set (propertytrue,
> > > targetexists, etc...):
> > >
> > > Total time: 0.6 seconds.
> > >
> > > Martin
> > >
> > > ----- Original Message -----
> > > From: "Ian MacLean" <[EMAIL PROTECTED]>
> > > To: "Jaroslaw Kowalski" <[EMAIL PROTECTED]>
> > > Cc: <[EMAIL PROTECTED]>
> > > Sent: Friday, November 21, 2003 7:14 AM
> > > Subject: Re: [nant-dev] PATCH: Expression evaluator for NAnt
> > >
> > >
> > > > Jaroslaw,
> > > > Awesome ! Checking it out now. Obviously this is another thing to go
> in
> > > > post 0.84 but this looks like a great start.
> > > > Thanks !
> > > >
> > > > Ian
> > > >
> > > > >Hi!
> > > > >
> > > > >As I've promised some time ago on the list, I've implemented a
> simple,
> > > yet
> > > > >very powerful, expression evaluator for NAnt. See below for a full
> list
> > > of
> > > > >features.
> > > > >You can now write quite sophisticated expressions, like:
> > > > >
> > > > ><if test="tolower(${somefilename}) = ${someotherfilename} +
'.txt'">
> > > > >...
> > > > ></if>
> > > > >
> > > > >I've added my parser to "NAnt.Core.ExpressionEval" namespace and
I've
> > > > >modified
> > > > ><if> and <ifnot> tasks to support a new attribute called "test"
> (named
> > > after
> > > > >XSLT ;-)
> > > > >
> > > > >It's ultra-easy to add new functions. You simply add new public C#
> > > function
> > > > >in "NAnt/Core/ExpressionEval/ExpressionEvaluator.cs" and it works!
> > > > >
> > > > >The code should be considered alpha-quality, but should work in
most
> > > cases.
> > > > >I've taken some well-tested parts from another project of mine, yet
> > some
> > > > >parts are new and they may not work correctly in 100% cases.
> > > > >
> > > > >Can someone please take a look at this patch and commit to CVS if
> it's
> > > ok?
> > > > >
> > > > >Jarek
> > > > >
> > > > >P.S. No NUnit-style unit tests yet, but I'm working on them.
> > > > >
> > > > >Full list of features:
> > > > >======================
> > > > >
> > > > >Data types:
> > > > > integer, double, string, boolean and date
> > > > >
> > > > >Operators:
> > > > > and, or, not
> > > > > =, <>, <, >, <=, >= (because NAnt is XML I'm considering
renaming
> > > them
> > > > >to lt, gt, le, ge)
> > > > > unary minus,
> > > > > +,-,*,/,%(modulo) with natural precedence, braces (), property
> > > access:
> > > > >${propertyname}
> > > > >
> > > > >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
> > > > >
> > > > >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
> > > > >
> > > > >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);
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Ian MacLean, Developer,
> > > > ActiveState, a division of Sophos
> > > > http://www.ActiveState.com
> > > >
> > > >
> > > >
> > > >
> > > > -------------------------------------------------------
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> > >
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