是否有簡單的方法來實現以下功能？以編程方式檢查字符串是否是Scala中的保留字
即決定在生成代碼時是否需要用反引號引用給定的文本片段。
def isReservedWord(text: String): Boolean
isReservedWord("type") // true
isReservedWord("foo") // false
當然，我可能只是維持基於在語言規範結尾Scala的語法摘要關鍵字的列表，並覈對，但有沒有更好的辦法？
編譯器保持它可以很容易地訪問關鍵字列表：
scala> import scala.tools.nsc._
import scala.tools.nsc._
scala> val compiler = new Global(new Settings)
compiler: scala.tools.nsc.Global = [email protected]
scala> compiler.nme.keywords
res0: Set[compiler.TermName] = Set(abstract, >:, true, val, do, throw, <-, package, _, macro, @, object, false, this, if, then, var, trait, ., catch, with, def, else, class, type, #, lazy, null, =, <:, override, protected, =>, private, sealed, finally, new, implicit, extends, final, for, return, case, import, forSome, :, super, while, yield, try, match, <%)
scala> compiler.javanme.keywords
res1: Set[compiler.TermName] = Set(abstract, strictfp, short, int, do, goto, interface, throw, float, package, implements, enum, this, long, if, switch, native, throws, boolean, catch, else, const, class, assert, public, void, instanceof, protected, static, default, private, finally, synchronized, new, char, extends, final, volatile, for, return, continue, case, import, double, super, byte, while, break, try, transient)
幸運的是，斯卡拉已經提供反射API，這只不過是由一個公共API訪問的編譯器別的。您可以訪問符號表，其中包含所有的定義，當你施放公衆型的內部之一：
scala> val st = scala.reflect.runtime.universe.asInstanceOf[scala.reflect.internal.SymbolTable]
st: scala.reflect.internal.SymbolTable = [email protected]
scala> st.nme.keywords
res10: Set[st.TermName] = Set(abstract, >:, true, val, do, throw, <-, package, _, macro, @, object, false, this, if, then, var, trait, ., catch, with, def, else, class, type, #, lazy, null, =, <:, override, protected, =>, private, sealed, finally, new, implicit, extends, final, for, return, case, import, forSome, :, super, while, yield, try, match, <%)
裏面的REPL，你也可以使用:power模式以訪問直接編譯：
scala> :power
** Power User mode enabled - BEEP WHIR GYVE **
** :phase has been set to 'typer'. **
** scala.tools.nsc._ has been imported **
** global._, definitions._ also imported **
** Try :help, :vals, power.<tab> **
scala> nme.keywords
res3: Set[$r.intp.global.TermName] = Set(abstract, >:, true, val, do, throw, <-, package, _, macro, @, object, false, this, if, then, var, trait, ., catch, with, def, else, class, type, #, lazy, null, =, <:, override, protected, =>, private, sealed, finally, new, implicit, extends, final, for, return, case, import, forSome, :, super, while, yield, try, match, <%)
scala> javanme.keywords
res4: Set[$r.intp.global.TermName] = Set(abstract, strictfp, short, int, do, goto, interface, throw, float, package, implements, enum, this, long, if, switch, native, throws, boolean, catch, else, const, class, assert, public, void, instanceof, protected, static, default, private, finally, synchronized, new, char, extends, final, volatile, for, return, continue, case, import, double, super, byte, while, break, try, transient)
Grepping編譯器源，我發現：
scala.tools.nsc.doc.html.SyntaxHigh.reserved
即包和私營部門爲html，所以你可能需要編寫一個包裝。將這個數組複製到自己的源代碼可能更容易。
內部API中有更多內容，例如scala.reflect.internal.StdNames。 scala.reflect.internal.Printers有一個方法quotedName，但你需要整個蛋糕來訪問這些。也許你可以通過正式的反射API獲得這些嗎？
謝謝！那很完美。 –