TypeScript types.isIdentifier函數代碼示例

export function matchesCallExpression(
    expression: babel.MemberExpression, path: string[]): boolean {
  if (!expression.property || !expression.object) {
    return false;
  }
  assert(path.length >= 2);

  if (!babel.isIdentifier(expression.property)) {
    return false;
  }
  // Unravel backwards, make sure properties match each step of the way.
  if (expression.property.name !== path[path.length - 1]) {
    return false;
  }
  // We've got ourselves a final member expression.
  if (path.length === 2 && babel.isIdentifier(expression.object)) {
    return expression.object.name === path[0];
  }
  // Nested expressions.
  if (path.length > 2 && babel.isMemberExpression(expression.object)) {
    return matchesCallExpression(
        expression.object, path.slice(0, path.length - 1));
  }

  return false;
}

export function isVariable(node: Expression): node is VariableAST {
  return (
    isCallExpression(node) &&
    isMemberExpression(node.callee, { computed: false }) &&
    isIdentifier(node.callee.object, { name: 'Variable' }) &&
    isIdentifier(node.callee.property, { name: 'find' }) &&
    isIdentifier(node.arguments[0], { name: 'gameModel' }) &&
    isStringLiteral(node.arguments[1])
  );
}

export function toMethodParam(
    nodeParam: babel.LVal, jsdocAnn?: jsdoc.Annotation): MethodParam {
  const paramTags = new Map<string, doctrine.Tag>();
  let name;
  let defaultValue;
  let rest;

  if (jsdocAnn) {
    for (const tag of (jsdocAnn.tags || [])) {
      if (tag.title === 'param' && tag.name) {
        paramTags.set(tag.name, tag);
      }
    }
  }

  if (babel.isIdentifier(nodeParam)) {
    // Basic parameter: method(param)
    name = nodeParam.name;

  } else if (
      babel.isRestElement(nodeParam) &&
      babel.isIdentifier(nodeParam.argument)) {
    // Rest parameter: method(...param)
    name = nodeParam.argument.name;
    rest = true;

  } else if (
      babel.isAssignmentPattern(nodeParam) &&
      babel.isIdentifier(nodeParam.left)) {
    // Parameter with a default: method(param = "default")
    name = nodeParam.left.name;
    defaultValue = generate(nodeParam.right).code;

  } else {
    // Some AST pattern we don't recognize. Hope the code generator does
    // something reasonable.
    name = generate(nodeParam).code;
  }

  let type;
  let description;
  const tag = paramTags.get(name);
  if (tag) {
    if (tag.type) {
      type = doctrine.type.stringify(tag.type);
    }
    if (tag.description) {
      description = tag.description;
    }
  }

  const param: MethodParam = {name, type, defaultValue, rest, description};
  return param;
}

export function getClosureType(
    node: babel.Node,
    parsedJsdoc: doctrine.Annotation|undefined,
    sourceRange: SourceRange,
    document: ParsedDocument): Result<string, Warning> {
  if (parsedJsdoc) {
    const typeTag = jsdoc.getTag(parsedJsdoc, 'type');
    if (typeTag) {
      return {successful: true, value: doctrine.type.stringify(typeTag.type!)};
    }
  }
  const type = VALID_EXPRESSION_TYPES.get(node.type);
  if (type) {
    return {successful: true, value: type};
  }
  if (babel.isIdentifier(node)) {
    return {
      successful: true,
      value: CLOSURE_CONSTRUCTOR_MAP.get(node.name) || node.name
    };
  }
  const warning = new Warning({
    code: 'no-closure-type',
    message: `Unable to determine closure type for expression of type ` +
        `${node.type}`,
    severity: Severity.WARNING,
    sourceRange,
    parsedDocument: document,
  });
  return {successful: false, error: warning};
}

export function isVariableCall(node: Expression): node is VariableCallAST {
  return (
    isCallExpression(node) &&
    isMemberExpression(node.callee, { computed: false }) &&
    isVariable(node.callee.object) &&
    isIdentifier(node.callee.property)
  );
}

export function extractGlobalMethod(node: CallExpression) {
  let ret: Identifier[] = [];
  let depth = node.callee;
  while (isMemberExpression(depth)) {
    if (!isIdentifier(depth.property)) {
      throw Error('Unhandled');
    }
    ret.push(depth.property);
    depth = depth.object;
  }
  if (!isIdentifier(depth)) {
    throw Error('Unhandled');
  }
  ret.push(depth);
  return ret
    .reverse()
    .map(i => i.name)
    .join('.');
}

export function getPropertyName(prop: PropertyOrMethod): string|undefined {
  const key = prop.key;
  // {foo: bar} // note that `foo` is not quoted, so it's an identifier
  if (!prop.computed && babel.isIdentifier(key)) {
    return key.name;
  }

  // Otherwise, try to statically evaluate the expression
  const keyValue = astValue.expressionToValue(key);
  if (keyValue !== undefined) {
    return '' + keyValue;
  }
  return undefined;
}

export function analyzeProperties(
    node: babel.Node, document: JavaScriptDocument): ScannedPolymerProperty[] {
  const analyzedProps: ScannedPolymerProperty[] = [];

  if (!babel.isObjectExpression(node)) {
    return analyzedProps;
  }

  for (const property of esutil.getSimpleObjectProperties(node)) {
    const prop = toScannedPolymerProperty(
        property, document.sourceRangeForNode(property)!, document);
    if (prop === undefined) {
      continue;
    }

    // toScannedPolymerProperty does the wrong thing for us with type. We want
    // type to be undefined unless there's a positive signal for the type.
    // toScannedPolymerProperty will give Object because it infers based on the
    // property declaration.
    prop.type = undefined;
    const typeTag = jsdoc.getTag(prop.jsdoc, 'type');
    if (typeTag) {
      prop.type =
          typeTag.type ? doctrine.type.stringify(typeTag.type) : undefined;
    }
    prop.published = true;

    let isComputed = false;

    const value = property.value;
    if (babel.isIdentifier(value)) {
      // Polymer supports this simple syntax, where only the attribute
      // deserializer is specified.
      prop.attributeType = value.name;

    } else if (!babel.isObjectExpression(value)) {
      continue;

    } else {
      /**
       * Parse the expression inside a property object block. e.g.
       * property: {
       *   key: {
       *     type: String,
       *     notify: true,
       *     value: -1,
       *     readOnly: true,
       *     reflectToAttribute: true
       *   }
       * }
       */
      for (const propertyArg of esutil.getSimpleObjectProperties(value)) {
        const propertyKey = esutil.getPropertyName(propertyArg);

        switch (propertyKey) {
          case 'type':
            prop.attributeType = astValue.getIdentifierName(propertyArg.value);
            if (prop.attributeType === undefined && prop.type === undefined) {
              prop.warnings.push(new Warning({
                code: 'invalid-property-type',
                message: 'Invalid type in property object.',
                severity: Severity.WARNING,
                sourceRange: document.sourceRangeForNode(propertyArg)!,
                parsedDocument: document
              }));
            }
            break;
          case 'notify':
            prop.notify = !!astValue.expressionToValue(propertyArg.value);
            break;
          case 'observer':
            const val = astValue.expressionToValue(propertyArg.value);
            prop.observerNode = propertyArg.value;
            const parseResult = parseExpressionInJsStringLiteral(
                document, propertyArg.value, 'identifierOnly');
            prop.warnings.push(...parseResult.warnings);
            prop.observerExpression = parseResult.databinding;
            if (val === undefined) {
              prop.observer = astValue.CANT_CONVERT;
            } else {
              prop.observer = JSON.stringify(val);
            }
            break;
          case 'readOnly':
            prop.readOnly = !!astValue.expressionToValue(propertyArg.value);
            break;
          case 'reflectToAttribute':
            prop.reflectToAttribute =
                !!astValue.expressionToValue(propertyArg.value);
            break;
          case 'computed':
            isComputed = true;
            const computedParseResult = parseExpressionInJsStringLiteral(
                document, propertyArg.value, 'callExpression');
            prop.warnings.push(...computedParseResult.warnings);
            prop.computedExpression = computedParseResult.databinding;
            break;
          case 'value':
            prop.default =
                JSON.stringify(astValue.expressionToValue(propertyArg.value));
//.........這裏部分代碼省略.........

export function declarationPropertyHandlers(
    declaration: ScannedPolymerElement,
    document: JavaScriptDocument,
    path: NodePath): PropertyHandlers {
  return {
    is(node: babel.Node) {
      if (babel.isLiteral(node)) {
        declaration.tagName = '' + astValue.expressionToValue(node);
      }
    },
    properties(node: babel.Node) {
      for (const prop of analyzeProperties(node, document)) {
        declaration.addProperty(prop);
      }
    },
    behaviors(node: babel.Node) {
      if (!babel.isArrayExpression(node)) {
        return;
      }
      for (const element of node.elements) {
        const result = getBehaviorReference(element, document, path);
        if (result.successful === false) {
          declaration.warnings.push(result.error);
        } else {
          declaration.behaviorAssignments.push(result.value);
        }
      }
    },
    observers(node: babel.Node) {
      const observers = extractObservers(node, document);
      if (!observers) {
        return;
      }
      declaration.warnings = declaration.warnings.concat(observers.warnings);
      declaration.observers = declaration.observers.concat(observers.observers);
    },
    listeners(node: babel.Node) {
      if (!babel.isObjectExpression(node)) {
        declaration.warnings.push(new Warning({
          code: 'invalid-listeners-declaration',
          message: '`listeners` property should be an object expression',
          severity: Severity.WARNING,
          sourceRange: document.sourceRangeForNode(node)!,
          parsedDocument: document
        }));
        return;
      }

      for (const p of getSimpleObjectProperties(node)) {
        const evtName =
            babel.isLiteral(p.key) && astValue.expressionToValue(p.key) ||
            babel.isIdentifier(p.key) && p.key.name;
        const handler =
            !babel.isLiteral(p.value) || astValue.expressionToValue(p.value);

        if (typeof evtName !== 'string' || typeof handler !== 'string') {
          // TODO (maklesoft): Notifiy the user somehow that a listener entry
          // was not extracted
          // because the event or handler namecould not be statically analyzed.
          // E.g. add a low-severity
          // warning once opting out of rules is supported.
          continue;
        }

        declaration.listeners.push({event: evtName, handler: handler});
      }
    }
  };
}

    Identifier(path) {
        console.log("Visiting: " + path.node.name);
    }
};

// Example from https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#babel-traverse
const code = `function square(n) {
    return n * n;
}`;

const ast = parse(code);

traverse(ast, {
    enter(path) {
        const node = path.node;
        if (t.isIdentifier(node) && node.name === "n") {
            node.name = "x";
        }
    }
});

// Examples from https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#writing-your-first-babel-plugin

const v1: Visitor = {
    BinaryExpression(path) {
        if (t.isIdentifier(path.node.left)) {
            // ...
        }
        path.replaceWith(
            t.binaryExpression("**", path.node.left, t.numericLiteral(2))
        );