ヤミRoot VoidGate

Viewing: expression-scope.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
exports.newArrowHeadScope = newArrowHeadScope;
exports.newAsyncArrowScope = newAsyncArrowScope;
exports.newExpressionScope = newExpressionScope;
exports.newParameterDeclarationScope = newParameterDeclarationScope;
var _parseError = require("../parse-error");
const kExpression = 0,
  kMaybeArrowParameterDeclaration = 1,
  kMaybeAsyncArrowParameterDeclaration = 2,
  kParameterDeclaration = 3;
class ExpressionScope {
  constructor(type = kExpression) {
    this.type = void 0;
    this.type = type;
  }
  canBeArrowParameterDeclaration() {
    return this.type === kMaybeAsyncArrowParameterDeclaration || this.type === kMaybeArrowParameterDeclaration;
  }
  isCertainlyParameterDeclaration() {
    return this.type === kParameterDeclaration;
  }
}
class ArrowHeadParsingScope extends ExpressionScope {
  constructor(type) {
    super(type);
    this.declarationErrors = new Map();
  }
  recordDeclarationError(ParsingErrorClass, {
    at
  }) {
    const index = at.index;
    this.declarationErrors.set(index, [ParsingErrorClass, at]);
  }
  clearDeclarationError(index) {
    this.declarationErrors.delete(index);
  }
  iterateErrors(iterator) {
    this.declarationErrors.forEach(iterator);
  }
}
class ExpressionScopeHandler {
  constructor(parser) {
    this.parser = void 0;
    this.stack = [new ExpressionScope()];
    this.parser = parser;
  }
  enter(scope) {
    this.stack.push(scope);
  }
  exit() {
    this.stack.pop();
  }
  recordParameterInitializerError(toParseError, {
    at: node
  }) {
    const origin = {
      at: node.loc.start
    };
    const {
      stack
    } = this;
    let i = stack.length - 1;
    let scope = stack[i];
    while (!scope.isCertainlyParameterDeclaration()) {
      if (scope.canBeArrowParameterDeclaration()) {
        scope.recordDeclarationError(toParseError, origin);
      } else {
        return;
      }
      scope = stack[--i];
    }
    this.parser.raise(toParseError, origin);
  }
  recordArrowParameterBindingError(error, {
    at: node
  }) {
    const {
      stack
    } = this;
    const scope = stack[stack.length - 1];
    const origin = {
      at: node.loc.start
    };
    if (scope.isCertainlyParameterDeclaration()) {
      this.parser.raise(error, origin);
    } else if (scope.canBeArrowParameterDeclaration()) {
      scope.recordDeclarationError(error, origin);
    } else {
      return;
    }
  }
  recordAsyncArrowParametersError({
    at
  }) {
    const {
      stack
    } = this;
    let i = stack.length - 1;
    let scope = stack[i];
    while (scope.canBeArrowParameterDeclaration()) {
      if (scope.type === kMaybeAsyncArrowParameterDeclaration) {
        scope.recordDeclarationError(_parseError.Errors.AwaitBindingIdentifier, {
          at
        });
      }
      scope = stack[--i];
    }
  }
  validateAsPattern() {
    const {
      stack
    } = this;
    const currentScope = stack[stack.length - 1];
    if (!currentScope.canBeArrowParameterDeclaration()) return;
    currentScope.iterateErrors(([toParseError, loc]) => {
      this.parser.raise(toParseError, {
        at: loc
      });
      let i = stack.length - 2;
      let scope = stack[i];
      while (scope.canBeArrowParameterDeclaration()) {
        scope.clearDeclarationError(loc.index);
        scope = stack[--i];
      }
    });
  }
}
exports.default = ExpressionScopeHandler;
function newParameterDeclarationScope() {
  return new ExpressionScope(kParameterDeclaration);
}
function newArrowHeadScope() {
  return new ArrowHeadParsingScope(kMaybeArrowParameterDeclaration);
}
function newAsyncArrowScope() {
  return new ArrowHeadParsingScope(kMaybeAsyncArrowParameterDeclaration);
}
function newExpressionScope() {
  return new ExpressionScope();
}

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