- inspired macrocosm and inkytonik's blog post
- Can not use if
$character contains. Does anyone have a solution? :(
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| import scala.reflect.macros.Context | |
| import scala.util.matching.Regex | |
| import java.util.regex.PatternSyntaxException | |
| object Macros{ | |
| implicit class RegexContext(val c: StringContext) { | |
| def r(): Regex = macro regexImpl | |
| } | |
| def regexImpl(c: Context)(): c.Expr[Regex] = { | |
| import c.universe._ | |
| c.prefix.tree match { | |
| case Apply(_,List(Apply(_,List(Literal(Constant(str: String)))))) => | |
| try{ | |
| str.r | |
| }catch{ | |
| case e: PatternSyntaxException => c.abort(c.enclosingPosition, e.toString) | |
| } | |
| val Apply(fun, _) = reify(new Regex("")).tree | |
| c.Expr[Regex](Apply.apply(fun, c.literal(str).tree :: Nil)) | |
| } | |
| } | |
| } |
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| import Macros._ | |
| object Main extends App{ | |
| println(r"foo|bar") // compile success ! | |
| println(r"[foo") // compile error ! | |
| println(r"foo$") // error: invalid string interpolation: `$$', `$'ident or `$'BlockExpr expected | |
| } |
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