swc_ecma_parser 39.1.1

Feature-complete es2019 parser.
Documentation 
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use swc_atoms::Atom;

bitflags::bitflags! {
  #[derive(Debug, Clone, Copy, Default)]
  pub struct Context: u32 {

      /// `true` while backtracking
      const IgnoreError = 1 << 0;

      /// Is in module code?
      const Module = 1 << 1;
      const CanBeModule = 1 << 2;
      const Strict = 1 << 3;

      const ForLoopInit = 1 << 4;
      const ForAwaitLoopInit = 1 << 5;

      const IncludeInExpr = 1 << 6;
      /// If true, await expression is parsed, and "await" is treated as a
      /// keyword.
      const InAsync = 1 << 7;
      /// If true, yield expression is parsed, and "yield" is treated as a
      /// keyword.
      const InGenerator = 1 << 8;

      /// If true, await is treated as a keyword.
      const InStaticBlock = 1 << 9;

      const IsContinueAllowed = 1 << 10;
      const IsBreakAllowed = 1 << 11;

      const InType = 1 << 12;
      /// Typescript extension.
      const ShouldNotLexLtOrGtAsType = 1 << 13;
      /// Typescript extension.
      const InDeclare = 1 << 14;

      /// If true, `:` should not be treated as a type annotation.
      const InCondExpr = 1 << 15;
      const WillExpectColonForCond = 1 << 16;

      const InClass = 1 << 17;

      const InClassField = 1 << 18;

      const InFunction = 1 << 19;

      /// This indicates current scope or the scope out of arrow function is
      /// function declaration or function expression or not.
      const InsideNonArrowFunctionScope = 1 << 20;

      const InParameters = 1 << 21;

      const HasSuperClass = 1 << 22;

      const InPropertyName = 1 << 23;

      const InForcedJsxContext = 1 << 24;

      // If true, allow super.x and super[x]
      const AllowDirectSuper = 1 << 25;

      const IgnoreElseClause = 1 << 26;

      const DisallowConditionalTypes = 1 << 27;

      const AllowUsingDecl = 1 << 28;

      const TopLevel = 1 << 29;

      const TsModuleBlock = 1 << 30;

      /// Flow extension.
      /// Disallow parsing top-level anonymous function types in arrow return type context.
      const DisallowFlowAnonFnType = 1 << 31;
  }
}

impl Context {
    #[cfg_attr(not(feature = "verify"), inline(always))]
    pub fn is_reserved_word(self, word: &Atom) -> bool {
        if !cfg!(feature = "verify") {
            return false;
        }

        match &**word {
            "let" => self.contains(Context::Strict),
            // SyntaxError in the module only, not in the strict.
            // ```JavaScript
            // function foo() {
            //     "use strict";
            //     let await = 1;
            // }
            // ```
            "await" => {
                self.contains(Context::InAsync)
                    || self.contains(Context::InStaticBlock)
                    || self.contains(Context::Module)
            }
            "yield" => self.contains(Context::InGenerator) || self.contains(Context::Strict),

            "null" | "true" | "false" | "break" | "case" | "catch" | "continue" | "debugger"
            | "default" | "do" | "export" | "else" | "finally" | "for" | "function" | "if"
            | "return" | "switch" | "throw" | "try" | "var" | "const" | "while" | "with"
            | "new" | "this" | "super" | "class" | "extends" | "import" | "in" | "instanceof"
            | "typeof" | "void" | "delete" => true,

            // Future reserved word
            "enum" => true,

            "implements" | "package" | "protected" | "interface" | "private" | "public"
                if self.contains(Context::Strict) =>
            {
                true
            }

            _ => false,
        }
    }
}