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Syntax summary | Quasiquotes | Scala Documentation

Quasiquotes

Syntax summary

This doc page is specific to features shipped in Scala 2, which have either been removed in Scala 3 or replaced by an alternative. Unless otherwise stated, all the code examples in this page assume you are using Scala 2.

Denys Shabalin EXPERIMENTAL

Expressions Â Quasiquote Type Empty q"" EmptyTree Literal q"$value" Literal Identifier q"$tname" or q"name" Ident Selection q"$expr.$tname" Select Super Selection q"$tpname.super[$tpname].$tname" Select This q"$tpname.this" This Application q"$expr(...$exprss)" Apply Type Application q"$expr[..$tpts]" TypeApply Assign q"$expr = $expr" Assign, AssignOrNamedArg Update q"$expr(..$exprs) = $expr" Tree Return q"return $expr" Return Throw q"throw $expr" Throw Ascription q"$expr: $tpt" Typed Annotated q"$expr: @$annot" Annotated Tuple q"(..$exprs)" Tree Block q"{ ..$stats }" Block If q"if ($expr) $expr else $expr" If Pattern Match q"$expr match { case ..$cases }" Match Try q"try $expr catch { case ..$cases } finally $expr" Try Function q"(..$params) => $expr" Function Partial Function q"{ case ..$cases }" Match While Loop q"while ($expr) $expr" LabelDef Do-While Loop q"do $expr while ($expr)" LabelDef For Loop q"for (..$enums) $expr" Tree For-Yield Loop q"for (..$enums) yield $expr" Tree New q"new { ..$earlydefns } with ..$parents { $self => ..$stats }" Tree XML Literal Not natively supported Tree Types Patterns Definitions Â Quasiquote Type Val q"$mods val $tname: $tpt = $expr" or q"$mods val $pat = $expr" ValDef Var q"$mods var $tname: $tpt = $expr" or q"$mods var $pat = $expr" ValDef Val Pattern q"$mods val $pat: $tpt = $expr" Tree Var Pattern q"$mods var $pat: $tpt = $expr" Tree Method q"$mods def $tname[..$tparams](...$paramss): $tpt = $expr" DefDef Secondary Constructor q"$mods def this(...$paramss) = this(..$argss)" DefDef Type q"$mods type $tpname[..$tparams] = $tpt" TypeDef Class

q"$mods class $tpname[..$tparams] $ctorMods(...$paramss) extends { ..$earlydefns } with ..$parents { $self => ..$stats }"

ClassDef Trait q"$mods trait $tpname[..$tparams] extends { ..$earlydefns } with ..$parents { $self => ..$stats }" TraitDef Object q"$mods object $tname extends { ..$earlydefns } with ..$parents { $self => ..$body }" ModuleDef Package q"package $ref { ..$topstats }" PackageDef Package Object q"package object $tname extends { ..$earlydefns } with ..$parents { $self => ..$stats }" PackageDef Auxiliary Abbreviations

Prefixes of unquotees imply the following:

name: Name, tname: TermName, tpname: TypeName
value: T where T is value type that corresponds to given literal (e.g. Int, Char, Float etc)
expr: Tree an expression tree
tpt: Tree a type tree
pat: Tree a pattern tree
defn: Tree a definition tree
earlydefn: Tree an early definion tree (val or type definition)
self: Tree a self definition tree (i.e. val definition)
stat: Tree a statement tree (definition, expression or an import)
topstat: Tree a top-level statement tree (class, trait, package, package object or import)
enum: Tree a for loop enumerator
param: Tree a value parameter tree (i.e. val definition)
tparam: Tree a type paremeter tree (i.e. type definition)
parent: Tree a template parent
sel: Tree an import selector tree

Whenever a name has suffix s it means that it is a List of something. ss means List of Lists. So for example exprss means a List of Lists of expressions.

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