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darnocian

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darnocian last won the day on July 30

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  1. darnocian

    How to get the actual UTC time??

    In my opinion, I'd try fix the OS configuration, or use a 3rd party if the default provided by the OS isn't good enough. From an application perspective, there should be a level of trust on basic services provided by system, otherwise there would be a lot of app bloat if everyone had to distrust them... When it comes to the APIs we use from the OS or the RTL, the key thing we need to pay attention to is the locale configuration (defined by the OS again), and use the appropriate toUTC/fromUTC type functionality. This is especially important when applying these functions appropriately when obtaining data from 3rd party sources and converting the timestamps appropriately, which would normally be sourced in UTC. On windows (desktop and server), there is w32tm.exe (windows time service) https://docs.microsoft.com/en-us/windows-server/networking/windows-time-service/windows-time-service-tools-and-settings. On my workstation this was disabled till I enabled it, but the other benefit is that within a larger organisation, the sysadmins could script something to deploy and enable appropriately with whatever the standard is so that everyone was covered consistently. I have worked on time sensitive apps before where we had 3rd party time agents on the host machine that synchronised the time, and custom libraries that worked with those agents, but this was because there was a very very low tolerance for any time drift at any time because the application was financial in nature working on financial market data in realtime and logging required more granular timestamp information. I'd try to stick to RTL functions or standard system calls like what @Wagner Landgraf referenced above, but that is my opinion.
  2. darnocian

    Parsing Text search expression

    I felt like playing with this idea for Delphi - as like writing parsers. 😉 Years ago I did something similar for a document management system in a different language. I've written a small demo illustrating 2 ways of parsing https://github.com/sempare/sempare-delphi-fts-expression I did this for fun and in a few hours, so it is still very raw. It contains a hand rolled lexer and parser, but hopefully can give you some ideas how to do this too. In the first (Sempare.FullTextSearch.SimpleExpression.Test.pas) you can see some scenarios: procedure TSimpleExprTest.TestSimpleExpr; begin assert.AreEqual('name = ''conrad''', tparser.ParseStr('name', '"conrad"')); end; procedure TSimpleExprTest.TestWildCard2Expr; begin assert.AreEqual('(name like ''conrad%'') or (name like ''%pete'')', tparser.ParseStr('name', '"conrad%" "%pete"')); end; procedure TSimpleExprTest.TestWildCardExpr; begin assert.AreEqual('name like ''conrad%''', tparser.ParseStr('name', '"conrad%"')); end; procedure TSimpleExprTest.TestNotExpr; begin assert.AreEqual('not (name = ''conrad'')', tparser.ParseStr('name', 'not "conrad"')); end; procedure TSimpleExprTest.TestOrExpr; begin assert.AreEqual('(name = ''abc'') or (name = ''def'')', tparser.ParseStr('name', '"abc" or "def"')); end; procedure TSimpleExprTest.TestPrecidentExpr; begin assert.AreEqual('(name = ''abc'') and (not ((name = ''321'') or (name = ''def'')))', tparser.ParseStr('name', '''abc'' and not ''321'' or ''def''')); end; The second (Sempare.FullTextSearch.Expression.Test.pas) is a bit more general. It illustrates parsing, but implementation at present is fairly basic as just a pretty printer: procedure TExprTest.TestNotExpr; begin assert.Areequal('not (name != ''conrad'')', tparser.ParseStr('not (name!="conrad")')); end; procedure TExprTest.TestOrExpr; begin assert.Areequal('(name = ''abc'') or (text = ''def'')', tparser.ParseStr('name = ''abc'' or text = ''def''')); end; procedure TExprTest.TestPrecidentExpr; begin assert.Areequal('((name = ''abc'') and (value = ''321'')) or (text = ''def'')', // tparser.ParseStr('name = ''abc'' and value = ''321'' or text = ''def''')); end; procedure TExprTest.TestStartsWithExpr; begin assert.Areequal('name like ''abc%''', tparser.ParseStr('name starts with "abc"')); end; above you can see that the parsing identifies the precedence and places brackets appropriately. Also it changed 'starts with' to 'like'... NOTE: there are 2 different parsers implemented for the above scenarios (but both named TParser - just depends which unit is being referenced) Hope you find this useful.
  3. the only way to get around it appears to be by explicitly setting the clipboard content in the current app (programatically or by the user copying something in the app), but switching between apps will result in the problem occurring again. I'm not sure if there is a workaround without Apple being involved - I suspect all we can do is inform users if this becomes annoying.
  4. I replicated the issue. I thought I was going mad. As per @sjordi opinion, it probably is just an iOS issue.. To reproduce: I switched to chrome and just copied the URL... switched back to the app, and then you can see the result as I'm typing:
  5. Actually, I just created a minimal version now with just a TEdit on it - and I didn't get the behaviour. I should have done this initially. 😉
  6. Yeah, I definitely agree with the benefit of the feature... but I would expect it to only happen when actually pasting from the clipboard - not while typing keys... I'll try knock something together with XCode to see what a standard input control like a UITextField would do as comparison... maybe there is something in FMX doing something it should have to. Will keep you posted.
  7. Thanks @sjordi. I feel better it isn't just me. ;)
  8. I was just testing an fmx app on ios and noticed that when editing in a tedit, I keep on getting little notifications at the top of the device '<app>pasted from <device>' every time I enter any character. I expected that notification to only happen when pasting from other apps on the device, not from the current one and not for every single keypress. Has anyone encountered this before?
  9. @mvanrijnen @Edwin Yip Thanks for the references. The aim with the Sempare Template Engine was to have a template engine that was native to Delphi and could be used for web, but also for other kinds of purposes such as code or config generation. At the time I wrote it, dmustache was mainly what was available, but I wanted a template language that was more readable and pascal-like, and from a library perspective providing more flexibility in terms of extension points (custom functions) and the ability to support various sub-template inclusion patterns (content with header/footer, main template referencing content template, etc) and dynamic loading. Due to the fact that looping is a feature, it also has to be safe and offers a timeout if template processing takes too long due to data processing or bad logic. It does rely on RTTI, which does mean there is a performance penalty, but I chose functionality/flexibility over performance to start. I have not had problems reported yet, so I suspect performance has been acceptable for users, as it has been for my use cases. Documentation wise, it should be fairly well covered on github, but I have been working on a CHM help edition which can be used from the IDE with context sensitive help which may be a bit more friendly for those that don't want to necessarily have to browse to the the github docs. Please email me conrad@sempare.ltd/conrad.vermeulen@gmail.com if you are interested and can notify you when it is available. If you have feature requests/comments feel free to raise them on the issue tracker (https://github.com/sempare/sempare-delphi-template-engine/issues). I do check here periodically, but may miss things or reply late. In the next release, I'm allowing for discovery of variables and functions that are referenced. So if you provide a template editor and are using a dictionary/json to pass variables, the UI can know upfront what the required variables are and perform additional validation if required, prompting the user if anything is missing. Alternatively, it could be a way to identify variables that are required, allowing for optimal querying of data from database before populating the template. This is just a complementary feature to an existing feature where errors can be raised if a referenced variable is not present. Further, I hope to create some more examples with more popular web frameworks soon, as I think many people find it easier to see how things work from demos. I realise licensing as GPL may be contentious, but I've gone with the 'free as in speech vs free as in beer' approach. So for a nominal one time fee, you can use it under the commercial license without any restriction. I'll keep you posted on new developments as they unfold.
  10. darnocian

    Poor performance of Python script

    One of the biggest issues with python, not necessarily python4d, is that everything is boxed. Many analytical packages use some packages like numpy/scipy which have some very powerful underlying C code that provides the boost without needing the boxing and unboxing of values where the python code is just providing very flexible glue. import numpy def test(size): x = numpy.random.rand(size) * 10 return numpy.logical_or(x > 6, x < 2).astype(int) * 20 + 20 test(500000) to get the above to work, you will need to install numpy if you don't already have it: pip install numpy It may be interesting to see if this approach provides any improvements? In the above, I could see there being a cost with the way it still has to evaluate the logical expression with a callback.
  11. darnocian

    ANN: Sempare Template Engine for Delphi

    v1.4.1 is available on GetIt now. Sorry, that release is not compatible with XE4 (my CI is running the latest Delphi only - something in my dev pipeline to support more generally). The version in github has an XE4 compatible fix, but will be bundled into the next release.
  12. darnocian

    ANN: Sempare Template Engine for Delphi

    Hi A new version v1.4.1 is now available and merged into the main branch. This will be available on GetIt shortly. The new version includes a bug fix mentioned above impacting on the fmt() function.
  13. darnocian

    ANN: Sempare Template Engine for Delphi

    No problem. I just realised I could configure email notifications on this thread as well. Either location will do, but this topic may get a bit long. 😀I was just mentioning as I only saw this after a few days.
  14. darnocian

    XLS 2 XLSX

    The apache POI java library ( https://poi.apache.org/ ) is pretty good when it comes to working with the office formats. I've mainly used it for extracting data, but have seen examples of it used for conversion too.
  15. darnocian

    ANN: Sempare Template Engine for Delphi

    Assert.AreEqual('123.457', Template.Eval('<% x := 123.456789 %><% fmt("%6.3f", x) %>')); here is a quick fix in Sempare.Template.Functions.pas: class function TInternalFuntions.Fmt(const AArgs: TArray<TValue>): string; var LArgs: TArray<TVarrec>; LIdx: integer; begin setlength(LArgs, high(AArgs)); for LIdx := 1 to high(AArgs) do LArgs[LIdx - 1] := AArgs[LIdx].AsVarRec; exit(format(AsString(AArgs[0]), LArgs)); end; I need to check into why the current helper does something different. Will get a fix into the main release soon. (fix is on dev branch)
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