Elm.Syntax.Expression

Expression Syntax

This syntax represents all that you can express in Elm. Although it is a easy and simple language, you can express a lot! See the Expression type for all the things you can express.

Types

type Expression

= UnitExpr

| Application (List (Node Expression))

| OperatorApplication

String

InfixDirection

(Node Expression)

| FunctionOrValue ModuleName String

| IfBlock (Node Expression) (Node Expression) (Node Expression)

| PrefixOperator String

| Operator String

| Integer Int

| Hex Int

| Floatable Float

| Negation (Node Expression)

| Literal String

| CharLiteral Char

| TupledExpression (List (Node Expression))

| ParenthesizedExpression (Node Expression)

| LetExpression LetBlock

| CaseExpression CaseBlock

| LambdaExpression Lambda

| RecordExpr (List (Node RecordSetter))

| ListExpr (List (Node Expression))

| RecordAccess (Node Expression) (Node String)

| RecordAccessFunction String

| RecordUpdateExpression (Node String) (List (Node RecordSetter))

| GLSLExpression String

Custom type for all expressions such as:

Unit: ()
Application: add a b
OperatorApplication: a + b
FunctionOrValue: add or True
IfBlock: if a then b else c
PrefixOperator: (+)
Operator: + (not possible to get in practice)
Integer: 42
Hex: 0x1F
Floatable: 42.0
Negation: -a
Literal: "text"
CharLiteral: 'a'
TupledExpression: (a, b) or (a, b, c)
ParenthesizedExpression: (a)
LetExpression: let a = 4 in a
CaseExpression: case a of followed by pattern matches
LambdaExpression: (\a -> a)
RecordExpr: { name = "text" }
ListExpr: [ x, y ]
RecordAccess: a.name
RecordAccessFunction: .name
RecordUpdateExpression: { a | name = "text" }
GLSLExpression: [glsl| ... |]

type alias Lambda =

{ args : List (Node Pattern)

, expression : Node Expression

}

Expression for a lambda

type alias LetBlock =

{ declarations : List (Node LetDeclaration)

, expression : Node Expression

}

Expression for a let block

type LetDeclaration

= LetFunction Function

| LetDestructuring (Node Pattern) (Node Expression)

Union type for all possible declarations in a let block

type alias RecordSetter =

( Node String, Node Expression )

Expression for setting a record field

type alias CaseBlock =

{ expression : Node Expression

, cases : Cases

}

Expression for a case block

type alias Cases =

List Case

Type alias for a list of cases

type alias Case =

( Node Pattern, Node Expression )

A case in a case block

type alias Function =

{ documentation : Maybe (Node Documentation)

, signature : Maybe (Node Signature)

, declaration : Node FunctionImplementation

}

Type alias for a full function

type alias FunctionImplementation =

{ name : Node String

, arguments : List (Node Pattern)

, expression : Node Expression

}

Type alias for a function's implementation

Functions

functionRange : Function -> Range

Get the full range of a function

isLambda : Expression -> Bool

Check whether an expression is a lambda-expression

isLet : Expression -> Bool

Check whether an expression is a let-expression

isIfElse : Expression -> Bool

Check whether an expression is an if-else-expression

isCase : Expression -> Bool

Check whether an expression is a case-expression

isOperatorApplication : Expression -> Bool

Check whether an expression is an operator appliation expression

Serialization

encode : Expression -> Value

Encode an Expression syntax element to JSON.

encodeFunction : Function -> Value

Encode a Function syntax element to JSON.

decoder : Decoder Expression

JSON decoder for an Expression syntax element.

functionDecoder : Decoder Function

JSON decoder for an Function syntax element.

stil4m/elm-syntax/7.2.2

Elm.Syntax.Expression

Expression Syntax

Types

Functions

Serialization

Modules