有没有一种简单的方法来实现以下功能？
即，在生成代码时判断给定的文本是否需要用反引号引用。
def isReservedWord(text: String): Boolean
isReservedWord("type") // true
isReservedWord("foo") // false
当然，我可以根据语言规范末尾的Scala语法摘要维护一个关键字列表，并检查一下，但是有更好的方法吗？
有没有一种简单的方法来实现以下功能？
即，在生成代码时判断给定的文本是否需要用反引号引用。
def isReservedWord(text: String): Boolean
isReservedWord("type") // true
isReservedWord("foo") // false
当然，我可以根据语言规范末尾的Scala语法摘要维护一个关键字列表，并检查一下，但是有更好的方法吗？
编译器维护一个可以轻松访问的关键字列表：
scala> import scala.tools.nsc._
import scala.tools.nsc._
scala> val compiler = new Global(new Settings)
compiler: scala.tools.nsc.Global = scala.tools.nsc.Global@29935953
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)
幸运的是，Scala已经提供了反射API，它只不过是公共API访问的编译器。将公共类型转换为内部类型时，可以访问包含所有定义的符号表：
scala> val st = scala.reflect.runtime.universe.asInstanceOf[scala.reflect.internal.SymbolTable]
st: scala.reflect.internal.SymbolTable = scala.reflect.runtime.JavaUniverse@472250c4
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, <%)
在REPL里面你也可以使用 :power 模式直接访问编译器：
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)
编译器维护一个可以轻松访问的关键字列表：
scala> import scala.tools.nsc._
import scala.tools.nsc._
scala> val compiler = new Global(new Settings)
compiler: scala.tools.nsc.Global = scala.tools.nsc.Global@29935953
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)
幸运的是，Scala已经提供了反射API，它只不过是公共API访问的编译器。将公共类型转换为内部类型时，可以访问包含所有定义的符号表：
scala> val st = scala.reflect.runtime.universe.asInstanceOf[scala.reflect.internal.SymbolTable]
st: scala.reflect.internal.SymbolTable = scala.reflect.runtime.JavaUniverse@472250c4
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, <%)
在REPL里面你也可以使用 :power 模式直接访问编译器：
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)
在编译器源代码中，我发现了以下内容：
scala.tools.nsc.doc.html.SyntaxHigh.reserved
这是包私有的 html，所以你可能要编写一个包装器。可能只是将该数组复制到您自己的源代码更容易。
内部API中有更多内容，例如 scala.reflect.internal.StdNames。和 scala.reflect.internal.Printers 有一个方法 quotedName，但你需要整个蛋糕来访问这些。也许你可以通过官方反映API获得任何这些？