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Trending Discussions on Style Language
How to write Haskell-style function application in Antlr
Variable used before being initialized error (Swift)
How can I use SASS pre-processor in my Vue components?
QUESTION
How to write Haskell-style function application in Antlr
Asked 2021-Dec-09 at 13:59I'm trying to write a Haskell-style language parser in ANTLR4, but I'm having some issues with function application. It parses as right associative rather than left associative
1expression :
2 unit #UnitExpression
3 | IntegerLiteral #IntExpression
4 | FloatLiteral #FloatExpression
5 | CharLiteral #CharExpression
6 | StringLiteral #StringExpression
7 | LSquareParen (expression (Comma expression)*)? RSquareParen #ListExpression
8 | LParen expression RParen #ParenExpression
9 | LParen (expression (Comma expression)+) RParen #TupleExpression
10 | expression operatorIdentifier expression #OperatorApplicationExpression
11 | expression (expression)+ #FunctionApplicationExpression
12 | variableIdentifier # VariableExpression
13;
14This is the relevant part of the grammar , the issue is that when I write something like f a b it parses as f (a b) rather than (f a) b
The actual example I was using was f "a" "b", which seemed even more confusing since String literals have higher precedence than function application.
I also tried rewriting to expression+ expression which didn't work because it's mutually left recursive apparently
How can I make this work?
ANSWER
Answered 2021-Dec-09 at 13:59As @sepp2k pointed out, | expression expression will correct your issue.
ANTLR defaults to left associativity., but you were overriding that with the (expression)+ in trying to gather all the expressions.
Of course, this will give you a parse tree of (expr (expr (expr f) (expr "a")) (expr "b"))
but this is probably more in keeping with a Haskell approach to function application than just a list of expressions.
BTW, precedence only comes into play when operators are involved. Having StringLiteral before LSquareParen his no effect on precedence since there's no ambiguity in determining the correct parse tree to derive. You may find that your OperatorApplicationExpresion alternative gives "surprising" results as it will evaluate all operators left-to-right, so a + b * c will be evaluated as "(a + b) * c" and this violates arithmetic norms (maybe it's what you want however).
QUESTION
Variable used before being initialized error (Swift)
Asked 2021-Jul-30 at 14:13I keep receiving an error/lint which reads Variable 'self.item' used before being initialized. This message only appears when I seemingly add a @State of type Date (see commented line below).
Variable item is a CoreData value that I'm attempting to update through a form. All of the other required data types (int, string, data, etc.) all work as expected.
I'm fairly confident that this is an issue which stems from my lack of experience with Swift or declarative-style languages in general, but I'm also wary that it could be a compiler issue as I seem to run into a few of those as well.
1import SwiftUI
2
3struct SelectionView: View {
4 @State var item : Item
5
6 @Environment(\.managedObjectContext) private var viewContext
7
8 @State private var name : String
9 @State private var imageData : Data
10 @State private var timestamp : Date // error only appears when this line is added
11
12 init(item : Item) {
13 self.item = item
14 self._name = State(initialValue: item.name!)
15 self._imageData = State(initialValue: item.imageData!)
16 self._timestamp = State(initialValue: item.timestamp!)
17 }
18
19 var body: some View {
20 VStack {
21 Form
22 {
23 TextField("Name", text: $name)
24 Image(uiImage: UIImage(data: imageData)!)
25 Button(action: changeImage, label: { Text("Change image") })
26 Button(action: save, label: { Text("Save") })
27 }
28 }
29 .padding()
30 }
31
32 ...
33ANSWER
Answered 2021-Jul-30 at 14:13Just do the following:
1import SwiftUI
2
3struct SelectionView: View {
4 @State var item : Item
5
6 @Environment(\.managedObjectContext) private var viewContext
7
8 @State private var name : String
9 @State private var imageData : Data
10 @State private var timestamp : Date // error only appears when this line is added
11
12 init(item : Item) {
13 self.item = item
14 self._name = State(initialValue: item.name!)
15 self._imageData = State(initialValue: item.imageData!)
16 self._timestamp = State(initialValue: item.timestamp!)
17 }
18
19 var body: some View {
20 VStack {
21 Form
22 {
23 TextField("Name", text: $name)
24 Image(uiImage: UIImage(data: imageData)!)
25 Button(action: changeImage, label: { Text("Change image") })
26 Button(action: save, label: { Text("Save") })
27 }
28 }
29 .padding()
30 }
31
32 ...
33@State var item: Item
34
35init(item: Item) {
36 _item = State(initialValue: item)
37}
38You can access all of the things you may need:
item$item.name(equivalent to when you had$name, same for other below)$item.imageData$item.timestamp
Also, if you don't need to pass anything else in, you can also get rid of the initializer because it is an inferred memberwise intializer.
Reason for the error you were having:
self.item doesn't exist yet. You set the @State with _item, and that will make the item and $item variables.
We can see this because seeing the definition of State shows the following:
1import SwiftUI
2
3struct SelectionView: View {
4 @State var item : Item
5
6 @Environment(\.managedObjectContext) private var viewContext
7
8 @State private var name : String
9 @State private var imageData : Data
10 @State private var timestamp : Date // error only appears when this line is added
11
12 init(item : Item) {
13 self.item = item
14 self._name = State(initialValue: item.name!)
15 self._imageData = State(initialValue: item.imageData!)
16 self._timestamp = State(initialValue: item.timestamp!)
17 }
18
19 var body: some View {
20 VStack {
21 Form
22 {
23 TextField("Name", text: $name)
24 Image(uiImage: UIImage(data: imageData)!)
25 Button(action: changeImage, label: { Text("Change image") })
26 Button(action: save, label: { Text("Save") })
27 }
28 }
29 .padding()
30 }
31
32 ...
33@State var item: Item
34
35init(item: Item) {
36 _item = State(initialValue: item)
37}
38public var wrappedValue: Value { get nonmutating set } // Normal value
39
40/* ... */
41
42public var projectedValue: Binding<Value> { get } // Binding value
43So since you can't access self.item because _item hasn't been initialized yet, you get the error. That's why we set _item using State(initialValue:).
QUESTION
How can I use SASS pre-processor in my Vue components?
Asked 2020-May-18 at 08:11I want to use language="sass" in my Vue 2 CLI project's components, but it throws me and error when using SASS syntax:
1Syntax Error: Missed semicolon
2I have installed sass-loader and node-sass as dev dependencies.
I added this to my webpack config's rules, but that did not fix it either:
1Syntax Error: Missed semicolon
2{
3 test: /\.sass$/,
4 use: [
5 'vue-style-loader',
6 'css-loader',
7 {
8 loader: 'sass-loader',
9 options: {
10 indentedSyntax: true,
11 // sass-loader version >= 8
12 sassOptions: {
13 indentedSyntax: true
14 },
15 prependData: `@import "@/styles/_variables.sass"`
16 }
17 }
18 ]
19 }
20The SASS code in my component:
1Syntax Error: Missed semicolon
2{
3 test: /\.sass$/,
4 use: [
5 'vue-style-loader',
6 'css-loader',
7 {
8 loader: 'sass-loader',
9 options: {
10 indentedSyntax: true,
11 // sass-loader version >= 8
12 sassOptions: {
13 indentedSyntax: true
14 },
15 prependData: `@import "@/styles/_variables.sass"`
16 }
17 }
18 ]
19 }
20<style language="sass">
21
22 #app
23 font-family: 'Avenir', Helvetica, Arial, sans-serif
24 -webkit-font-smoothing: antialiased
25 -moz-osx-font-smoothing: grayscale
26 text-align: center
27 color: #2c3e50
28 margin-top: 60px
29
30</style>
31ANSWER
Answered 2020-May-18 at 08:11If anyone is interested, I repeated the same steps in my vue utils file, and it solved the problem
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