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Questions tagged [quotations]

Code quotations, a language feature that enables you to generate and work with F# code expressions programmatically. This feature lets you generate an abstract syntax tree that represents F# code.

Code quotations, a language feature that enables you to generate and work with F# code expressions programmatically. This feature lets you generate an abstract syntax tree that represents F# code.

For more information about F# quotations, please visit its MSDN page.

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EF Core Quotations - filter composite key by list of ids

There is an entity that using composite key: [] type Entity = { Id1: int Id2: int Number: string } I'd like to filter entities by list of ids tuple using EF Core. Ideally the produced query should use many wheres like…
torcylius
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Quotation real usages

I faced with the 'quotation' term and I'm trying to figure out some real-life examples of usage of it. Ability of having AST for each code expression sounds awesome, but how to use it in real life? Does anyone know such example?
madcyree
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Why is plotly() and enquo + !! in conflict?

I am writing a function that uses plot_ly for a pieplot. The tilde (~) within argument labels = ~ is in conflict with the unquote operator !!. Is there a solution for this problem? pieplotr <- function (df, Property){ Property_Name <-…
Soph Carr
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Retrieving the F# code inside a Quotation

How can I get the original F# code inside a quotation? I know that in C# Expression.ToString() gives a reasonable string but it's not 100% and doesn't work in F#.
alakfq
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composing many quotations into linq queries

I'm working on a project in which I'm trying to use F# and Linq for UDF's and stored procs in an SQL server. Part of that has been to statically define all the valid queries, the sorting criteria, and a means of scoring the results of the…
Alex Mumme
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Bash How to wrap values of the first line of a csv file with quotations, if they do not exist

The other day I asked how to wrap values of the first line of a csv file with quotations. I was given this reply which worked great. $ cat file.csv word1,word2,word3,word4,word5 12345,12346,12347,12348,12349 To put quotes around the items in…
Vituvo
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Capturing group number

I've been making a parser using Regex in PowerShell, and it works really well so far, except for that issue I'm having. \s*([a-zA-Z_]+)\s*=(?:\s*"(.*)"|([^;#]*)) I've made this Regex to match, with success, these scenarios: Name= "Value"…
Blah
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F# Type Providers - nested properties instantiation

I'm trying to build my first toy-like Type Provider. What I'm trying to achieve is to have dynamically generated properties of dynamically generated types. collection |> getItems |> Seq.map(fun mapItem -> let nestedType =…
mickl
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Using untyped F# quotations to copy an array without knowing the type

I'm working on a small project to using quotations to clone trees of some basic record types and I have it working in most cases, the big problem I'm having is with arrays. module FSharpType = /// predicate for testing types to see if they are…
Rick Minerich
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How to get F# quotation for a interface instance method?

In F#, we can create interface instance by object expression, but while I'm trying to use attribute ReflectedDefinition on the instance method, then I cannot get the quotations. The method info is declared in the interface type, not the instance…
Xiang Zhang
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F# code quotation invocation, performance, and run-time requirements

Here are 4 deeply related questions about F# code quotations - How do I invoke an F# code quotation? Will it be invoked in a manner less efficient than if it were just a plain old F# lambda? to what degree? Will it require run-time support for…
Bryan Edds
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fsharp quotation Expr list -> Expr handling

What can I do to get the following working? I need to make a function that accepts a Expr list and returns a Expr (Expr list -> Epxr). type DataObject() = let data = System.Collections.Generic.Dictionary() member this.AddValue…
BBL
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Trouble with FSharp active patterns

I'm parsing code quotations in FSharp and am building up pattern helpers. All was going well till I tried let (|BinaryFn|_|) fn (input:Expr) = function | SpecificCall fn (_,_,l::r::[]) -> Some(l,r) | _ -> None let (|Multiply|_|) x = …
bradgonesurfing
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Comparing code quotations in F# for equality fails

I have the beginnings of a calculus toolbox in f#. It's as much about learning f# as having something useful at the end to use in some other projects I have in mind. The basic and incomplete code is namespace BradGoneSurfing.Symbolics open…
bradgonesurfing
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How to extract citations from a text (PHP)?

Hello! I would like to extract all citations from a text. Additionally, the name of the cited person should be extracted. DayLife does this very well. Example: “They think it’s ‘game over,’ ” one senior administration official said. The phrase…
caw
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