quotations

问题 I have an applescript function which processes each item of an array. I'm looking for a way to drop a list like the following into my applescript file: arrayitem1 arrayitem2 arrayitem3 and to use applescript to automatically format it into the proper applescript array syntax so I end up with this: set array1 to {"arrayitem1", "arrayitem2", "arrayitem3"} As you can imagine, for longer arrays it would be a hassle to manually add all the commas and quotations. Thanks! 回答1: set stringofitems to "

问题 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 the first line only: $ sed '1 { s/^/"/; s/,/","/g; s/$/"/ }' file.csv "word1","word2","word3","word4","word5" 12345,12346,12347,12348,12349 I now need to test if the quotes exist around the values to eliminate chances of double quoting values. 回答1: This

问题 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 the first line only: $ sed '1 { s/^/"/; s/,/","/g; s/$/"/ }' file.csv "word1","word2","word3","word4","word5" 12345,12346,12347,12348,12349 I now need to test if the quotes exist around the values to eliminate chances of double quoting values. 回答1: This

问题 I just ran across http://frankniemeyer.blogspot.com/2010/04/minimalistic-native-64-bit-array.html Which contains the line (# "sizeof !0" type('T) : nativeint #) I believe the technical phrase is "what the heck?" I have never in my (~8 months) of F# programming run across something even resembling that... FSI tells me something about deprecated constructs, used only for F# libs... And google with (# does uh...well, not much Any direction in this? 回答1: This is the notation for inline IL

问题 I'm playing around with quotations and I can't see an expression pattern for type definitions. Is there really not one, or am I missing something? <@@ type MyType (name:string) = member x.Name = name @@> Gives "Unexpected keyword 'type' in quotation literal." 回答1: You can't. You can only quote code, that is to say, any valid F# expression. Type definitions are not considered as code, but definitions. What you might want to do is put ReflectedDefinition attribute on a type members: type MyType

问题 This question already has answers here : Single quotes vs. double quotes in Python [closed] (19 answers) Closed 3 years ago . In other words, how do I know which one to use? I know when I use strings. I would do string = "This is a string" When would I use ' ' or """ """? 回答1: '...' and "..." are equivalent. If you have an apostrophe in the string, it is easier to use "..." so you don't have to escape the apostrophe. If you have quotes in the string, it's easier to use '...' so you don't have

问题 This question already has answers here : Single quotes vs. double quotes in Python [closed] (19 answers) Closed 3 years ago . In other words, how do I know which one to use? I know when I use strings. I would do string = "This is a string" When would I use ' ' or """ """? 回答1: '...' and "..." are equivalent. If you have an apostrophe in the string, it is easier to use "..." so you don't have to escape the apostrophe. If you have quotes in the string, it's easier to use '...' so you don't have

问题 How would one write a regex that matches a pattern that can contain quotes, but if it does, must have matching quotes at the beginning and end? "?(pattern)"? Will not work because it will allow patterns that begin with a quote but don't end with one. "(pattern)"|(pattern) Will work, but is repetitive. Is there a better way to do that without repeating the pattern? 回答1: You can get a solution without repeating by making use of backreferences and conditionals: /^(")?(pattern)(?(1)\1|)$/ Matches

问题 Given an F# record: type R = { X : string ; Y : string } and two objects: let a = { X = null ; Y = "##" } let b = { X = "##" ; Y = null } and a predicate on strings: let (!?) : string -> bool = String.IsNullOrWhiteSpace and a function: let (-?>) : string -> string -> string = fun x y -> if !? x then y else x is there a way to use F# quotations to define: let (><) : R -> R -> R with behaviour: let c = a >< b // = { X = a.X -?> b.X ; Y = a.Y -?> b.Y } in a way that somehow lets (><) work for

问题 F# has both typed and untyped code quotations and I wonder what are the use cases where one would choose one over the other? Is the distinction just convenience and untyped and typed quotations are convertible to each in all cases or are typed quotations e. g. a subset of the ones possible with untyped quotations? Are there any examples which only work with typed, but not with untyped quotations – or the other way around? 回答1: In general, I'd recommend using typed quotations whenever you can.