TypeScript babel-types.isConditionalExpression函数代码示例

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本文整理汇总了TypeScript中babel-types.isConditionalExpression函数的典型用法代码示例。如果您正苦于以下问题：TypeScript isConditionalExpression函数的具体用法？TypeScript isConditionalExpression怎么用？TypeScript isConditionalExpression使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了isConditionalExpression函数的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的TypeScript代码示例。

示例1: toConstant

 function toConstant(expression: b.Expression): any {
   if (!constant) return;
   if (b.isArrayExpression(expression)) {
     const result = [];
     for (let i = 0; constant && i < expression.elements.length; i++) {
       const element = expression.elements[i];
       if (b.isSpreadElement(element)) {
         const spread = toConstant(element.argument);
         if (!(isSpreadable(spread) && constant)) {
           constant = false;
         } else {
           result.push(...spread);
         }
       } else {
         result.push(toConstant(element));
       }
     }
     return result;
   }
   if (b.isBinaryExpression(expression)) {
     const left = toConstant(expression.left);
     const right = toConstant(expression.right);
     return constant && binaryOperation(expression.operator, left, right);
   }
   if (b.isBooleanLiteral(expression)) {
     return expression.value;
   }
   if (b.isCallExpression(expression)) {
     const args = [];
     for (let i = 0; constant && i < expression.arguments.length; i++) {
       const arg = expression.arguments[i];
       if (b.isSpreadElement(arg)) {
         const spread = toConstant(arg.argument);
         if (!(isSpreadable(spread) && constant)) {
           constant = false;
         } else {
           args.push(...spread);
         }
       } else {
         args.push(toConstant(arg));
       }
     }
     if (!constant) return;
     if (b.isMemberExpression(expression.callee)) {
       const object = toConstant(expression.callee.object);
       if (!object || !constant) {
         constant = false;
         return;
       }
       const member = expression.callee.computed
         ? toConstant(expression.callee.property)
         : b.isIdentifier(expression.callee.property)
           ? expression.callee.property.name
           : undefined;
       if (member === undefined && !expression.callee.computed) {
         constant = false;
       }
       if (!constant) return;
       if (canCallMethod(object, '' + member)) {
         return object[member].apply(object, args);
       }
     } else {
       const callee = toConstant(expression.callee);
       if (!constant) return;
       return callee.apply(null, args);
     }
   }
   if (b.isConditionalExpression(expression)) {
     const test = toConstant(expression.test);
     return test
       ? toConstant(expression.consequent)
       : toConstant(expression.alternate);
   }
   if (b.isIdentifier(expression)) {
     if (
       options.constants &&
       {}.hasOwnProperty.call(options.constants, expression.name)
     ) {
       return options.constants[expression.name];
     }
   }
   if (b.isLogicalExpression(expression)) {
     const left = toConstant(expression.left);
     const right = toConstant(expression.right);
     if (constant && expression.operator === '&&') {
       return left && right;
     }
     if (constant && expression.operator === '||') {
       return left || right;
     }
   }
   if (b.isMemberExpression(expression)) {
     const object = toConstant(expression.object);
     if (!object || !constant) {
       constant = false;
       return;
     }
     const member = expression.computed
       ? toConstant(expression.property)
       : b.isIdentifier(expression.property)
//.........这里部分代码省略.........

开发者ID:Ashwinie，项目名称:inceptionEngine，代码行数:101，代码来源:index.ts

示例2: parseLoopBody

export function parseLoopBody (
  body: NodePath<t.BlockStatement>,
  jsxDeclarations: Set<NodePath<t.Node>>,
  // @TODO
  // 把 templates 换成 Map 可以支持 shalow variables declared
  // 现在先用 ESLint 的 no-shalow 顶着
  templates: Map<string, t.JSXElement>,
  loopScopes: Set<string>,
  finalReturnElement: t.JSXElement,
  returnedPaths: NodePath<t.Node>[]
) {
  const bodyScope = body.scope
  body.traverse({
    JSXElement (jsxElementPath) {
      const parentNode = jsxElementPath.parent
      const parentPath = jsxElementPath.parentPath
      const isFinalReturn = jsxElementPath.getFunctionParent().isClassMethod()
      const isJSXChildren = t.isJSXElement(parentNode)
      if (!isJSXChildren) {
        let statementParent = jsxElementPath.getStatementParent()
        if (
          !(
            statementParent.isVariableDeclaration() ||
            statementParent.isExpressionStatement()
          )
        ) {
          statementParent = statementParent.findParent(
            s => s.isVariableDeclaration() || s.isExpressionStatement()
          ) as NodePath<t.Statement>
        }
        jsxDeclarations.add(statementParent)
        if (t.isVariableDeclarator(parentNode)) {
          if (statementParent) {
            const name = findIdentifierFromStatement(statementParent.node as t.VariableDeclaration)
            // setTemplate(name, path, templates)
            name && templates.set(name, jsxElementPath.node)
          }
        } else if (t.isLogicalExpression(parentNode)) {
          const { left, operator } = parentNode
          if (operator === '&&') {
            if (t.isExpression(left)) {
              newJSXIfAttr(jsxElementPath.node, left)
              parentPath.replaceWith(jsxElementPath.node)
              if (statementParent) {
                const name = findIdentifierFromStatement(statementParent.node as t.VariableDeclaration)
                setTemplate(name, jsxElementPath, templates)
                // name && templates.set(name, path.node)
              }
            }
          }
        } else if (t.isConditionalExpression(parentNode)) {
          const { test, consequent, alternate } = parentNode
          const block = buildBlockElement()
          if (t.isJSXElement(consequent) && t.isLiteral(alternate)) {
            const { value, confident } = parentPath.get('alternate').evaluate()
            if (confident && !value) {
              newJSXIfAttr(block, test)
              block.children = [ jsxElementPath.node ]
              // newJSXIfAttr(jsxElementPath.node, test)
              parentPath.replaceWith(block)
              if (statementParent) {
                const name = findIdentifierFromStatement(
                  statementParent.node as t.VariableDeclaration
                )
                setTemplate(name, jsxElementPath, templates)
                // name && templates.set(name, path.node)
              }
            }
          } else if (t.isLiteral(consequent) && t.isJSXElement(consequent)) {
            if (t.isNullLiteral(consequent)) {
              newJSXIfAttr(block, reverseBoolean(test))
              // newJSXIfAttr(jsxElementPath.node, reverseBoolean(test))
              parentPath.replaceWith(block)
              if (statementParent) {
                const name = findIdentifierFromStatement(
                  statementParent.node as t.VariableDeclaration
                )
                setTemplate(name, jsxElementPath, templates)
                // name && templates.set(name, path.node)
              }
            }
          } else if (t.isJSXElement(consequent) && t.isJSXElement(alternate)) {
            const block2 = buildBlockElement()
            block.children = [consequent]
            newJSXIfAttr(block, test)
            setJSXAttr(block2, Adapter.else)
            block2.children = [alternate]
            const parentBlock = buildBlockElement()
            parentBlock.children = [block, block2]
            parentPath.replaceWith(parentBlock)
            if (statementParent) {
              const name = findIdentifierFromStatement(
                statementParent.node as t.VariableDeclaration
              )
              setTemplate(name, jsxElementPath, templates)
            }
          } else {
            // console.log('todo')
          }
        } else if (t.isReturnStatement(parentNode)) {
//.........这里部分代码省略.........

开发者ID:AlloyTeam，项目名称:Nuclear，代码行数:101，代码来源:loop-component.ts

注：本文中的babel-types.isConditionalExpression函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。