TypeScript babel-types.nullLiteral函数代码示例

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本文整理汇总了TypeScript中babel-types.nullLiteral函数的典型用法代码示例。如果您正苦于以下问题：TypeScript nullLiteral函数的具体用法？TypeScript nullLiteral怎么用？TypeScript nullLiteral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nullLiteral函数的10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: generateAnonymousState

export function generateAnonymousState (
  scope: Scope,
  expression: NodePath<t.Expression>,
  refIds: Set<t.Identifier>,
  isLogical?: boolean
) {
  let variableName = `anonymousState_${scope.generateUid()}`
  let statementParent = expression.getStatementParent()
  if (!statementParent) {
    throw codeFrameError(expression.node.loc, '无法生成匿名 State，尝试先把值赋到一个变量上再把变量调换。')
  }
  const jsx = isLogical ? expression : expression.findParent(p => p.isJSXElement())
  const callExpr = jsx.findParent(p => p.isCallExpression() && isArrayMapCallExpression(p)) as NodePath<t.CallExpression>
  const conditionExpr = jsx.findParent(p => p.isConditionalExpression())
  const logicExpr = jsx.findParent(p => p.isLogicalExpression({ operator: '&&' }))
  let expr = cloneDeep(expression.node)
  if (conditionExpr && conditionExpr.isConditionalExpression()) {
    const consequent = conditionExpr.get('consequent')
    if (consequent === jsx || jsx.findParent(p => p === consequent)) {
      expr = t.conditionalExpression(conditionExpr.get('test').node as any, expr, t.nullLiteral())
    }
  }
  if (logicExpr && logicExpr.isLogicalExpression({ operator: '&&' })) {
    const consequent = logicExpr.get('right')
    if (consequent === jsx || jsx.findParent(p => p === consequent)) {
      expr = t.conditionalExpression(logicExpr.get('left').node as any, expr, t.nullLiteral())
    }
  }
  if (!callExpr) {
    refIds.add(t.identifier(variableName))
    statementParent.insertBefore(
      buildConstVariableDeclaration(variableName, expr)
    )
  } else {
    variableName = `${LOOP_STATE}_${callExpr.scope.generateUid()}`
    const func = callExpr.node.arguments[0]
    if (t.isArrowFunctionExpression(func)) {
      if (!t.isBlockStatement(func.body)) {
        func.body = t.blockStatement([
          buildConstVariableDeclaration(variableName, expr),
          t.returnStatement(func.body)
        ])
      } else {
        statementParent.insertBefore(
          buildConstVariableDeclaration(variableName, expr)
        )
      }
    }
  }
  expression.replaceWith(
    t.identifier(variableName)
  )
}

开发者ID:ApolloRobot，项目名称:taro，代码行数:53，代码来源:utils.ts

示例2: parseWXML

export function parseWXML (dirPath: string, wxml?: string, parseImport?: boolean): {
  wxses: WXS[]
  wxml?: t.Node
  imports: Imports[]
  refIds: Set<string>
} {
  if (!parseImport) {
    errors.length = 0
    usedComponents.clear()
  }
  usedComponents.add('Block')
  let wxses: WXS[] = []
  let imports: Imports[] = []
  const refIds = new Set<string>()
  const loopIds = new Set<string>()
  if (!wxml) {
    return {
      wxses,
      imports,
      refIds,
      wxml: t.nullLiteral()
    }
  }
  const nodes = removEmptyTextAndComment(parse(wxml.trim()))
  const ast = t.file(
    t.program(
      [
        t.expressionStatement(parseNode(
          buildElement('block', nodes as Node[])
        ) as t.Expression)
      ],
      []
    )
  )

  traverse(ast, createWxmlVistor(loopIds, refIds, dirPath, wxses, imports))

  refIds.forEach(id => {
    if (loopIds.has(id) || imports.filter(i => i.wxs).map(i => i.name).includes(id)) {
      refIds.delete(id)
    }
  })

  return {
    wxses,
    imports,
    wxml: hydrate(ast),
    refIds
  }
}

开发者ID:YangShaoQun，项目名称:taro，代码行数:50，代码来源:wxml.ts

示例3: convertArrayToAstExpression

 return arr.map(value => {
   if (typeof value === 'string') {
     return t.stringLiteral(value)
   }
   if (typeof value === 'number') {
     return t.numericLiteral(value)
   }
   if (typeof value === 'boolean') {
     return t.booleanLiteral(value)
   }
   if (Array.isArray(value)) {
     return convertArrayToAstExpression(value)
   }
   if (typeof value === 'object') {
     return t.objectExpression(convertObjectToAstExpression(value))
   }
   return t.nullLiteral()
 })

开发者ID:YangShaoQun，项目名称:taro，代码行数:18，代码来源:astConvert.ts

示例4:

 const objArr = Object.keys(obj).map(key => {
   const value = obj[key]
   if (typeof value === 'string') {
     return t.objectProperty(t.stringLiteral(key), t.stringLiteral(value))
   }
   if (typeof value === 'number') {
     return t.objectProperty(t.stringLiteral(key), t.numericLiteral(value))
   }
   if (typeof value === 'boolean') {
     return t.objectProperty(t.stringLiteral(key), t.booleanLiteral(value))
   }
   if (Array.isArray(value)) {
     return t.objectProperty(t.stringLiteral(key), t.arrayExpression(convertArrayToAstExpression(value as [])))
   }
   if (typeof value === 'object') {
     return t.objectProperty(t.stringLiteral(key), t.objectExpression(convertObjectToAstExpression(value)))
   }
   return t.objectProperty(t.stringLiteral(key), t.nullLiteral())
 })

开发者ID:YangShaoQun，项目名称:taro，代码行数:19，代码来源:astConvert.ts

示例5: JSXElement

        if (t.isFunctionExpression(node)) {
            node.params = [t.identifier('param')];
        }
    }
});

if (t.isBinaryExpression(ast)) {
    ast.left;
    ast.right;
    ast.operator;
}

t.assertBinaryExpression(ast);
t.assertBinaryExpression(ast, { operator: "*" });

const exp: t.Expression = t.nullLiteral();

// React examples:
// https://github.com/babel/babel/blob/4e50b2d9d9c376cee7a2cbf56553fe5b982ea53c/packages/babel-plugin-transform-react-inline-elements/src/index.js#L61
traverse(ast, {
    JSXElement(path, file) {
        const { node } = path;
        const open = node.openingElement;

        // init
        const type = open.name;

        let newType: t.StringLiteral;
        if (t.isJSXIdentifier(type) && t.react.isCompatTag(type.name)) {
            newType = t.stringLiteral(type.name);
        }

开发者ID:AlexGalays，项目名称:DefinitelyTyped，代码行数:31，代码来源:babel-types-tests.ts

示例6: parseWXML

export function parseWXML (dirPath: string, wxml?: string, parseImport?: boolean): {
  wxses: WXS[]
  wxml?: t.Node
  imports: Imports[]
} {
  if (!parseImport) {
    errors.length = 0
  }
  usedComponents.clear()
  let wxses: WXS[] = []
  let imports: Imports[] = []
  if (!wxml) {
    return {
      wxses,
      imports,
      wxml: t.nullLiteral()
    }
  }
  const nodes = removEmptyTextAndComment(parse(wxml.trim()))
  const ast = t.file(
    t.program(
      [
        t.expressionStatement(parseNode(
          buildElement('block', nodes as Node[])
        ) as t.Expression)
      ],
      []
    )
  )

  traverse(ast, {
    JSXAttribute (path) {
      const name = path.node.name as t.JSXIdentifier
      const jsx = path.findParent(p => p.isJSXElement()) as NodePath<
        t.JSXElement
      >
      const valueCopy = cloneDeep(path.get('value').node)
      transformIf(name.name, path, jsx, valueCopy)
      transformLoop(name.name, path, jsx, valueCopy)
    },
    JSXElement: {
      enter (path: NodePath<t.JSXElement>) {
        const openingElement = path.get('openingElement')
        const jsxName = openingElement.get('name')
        const attrs = openingElement.get('attributes')
        if (!jsxName.isJSXIdentifier()) {
          return
        }
        const tagName = jsxName.node.name
        if (tagName === 'Wxs') {
          wxses.push(getWXS(attrs.map(a => a.node), path, dirPath))
        }
        if (tagName === 'Template') {
          const template = parseTemplate(path, dirPath)
          if (template) {
            const { ast: classDecl, name } = template
            const taroComponentsImport = buildImportStatement('@tarojs/components', [
              ...usedComponents
            ])
            const taroImport = buildImportStatement('@tarojs/taro', [], 'Taro')
            // const withWeappImport = buildImportStatement(
            //   '@tarojs/with-weapp',
            //   [],
            //   'withWeapp'
            // )
            const ast = t.file(t.program([]))
            ast.program.body.unshift(
              taroComponentsImport,
              taroImport,
              // withWeappImport,
              t.exportDefaultDeclaration(classDecl)
            )
            imports.push({
              ast,
              name
            })
          }
        }
        if (tagName === 'Import') {
          const mods = parseModule(path, dirPath, 'import')
          if (mods) {
            imports = imports.concat(mods)
          }
        }
        if (tagName === 'Include') {
          parseModule(path, dirPath, 'include')
        }
      },
      exit (path: NodePath<t.JSXElement>) {
        const openingElement = path.get('openingElement')
        const jsxName = openingElement.get('name')
        if (!jsxName.isJSXIdentifier({ name: 'Block' })) {
          return
        }
        const children = path.node.children
        if (children.length === 1) {
          const caller = children[0]
          if (t.isJSXExpressionContainer(caller) && t.isCallExpression(caller.expression) && !path.parentPath.isExpressionStatement()) {
            path.replaceWith(caller)
          }
//.........这里部分代码省略.........

开发者ID:topud，项目名称:taro，代码行数:101，代码来源:wxml.ts

示例7: analyzeImportUrl

function analyzeImportUrl ({
  astPath,
  value,
  sourceFilePath,
  filePath,
  styleFiles,
  scriptFiles,
  jsonFiles,
  mediaFiles
}: IAnalyzeImportUrlOptions): void {
  const valueExtname = path.extname(value)
  const node = astPath.node
  const {
    nodeModulesPath,
    npmOutputDir,
    sourceDir,
    outputDir,
    npmConfig
  } = getBuildData()
  if (value.indexOf('.') === 0) {
    let importPath = path.resolve(path.dirname(sourceFilePath), value)
    importPath = resolveScriptPath(importPath)
    if (isFileToBePage(importPath)) {
      astPath.remove()
    } else {
      if (REG_SCRIPT.test(valueExtname) || REG_TYPESCRIPT.test(valueExtname)) {
        const vpath = path.resolve(sourceFilePath, '..', value)
        let fPath = value
        if (fs.existsSync(vpath) && vpath !== sourceFilePath) {
          fPath = vpath
        }
        if (scriptFiles.indexOf(fPath) < 0) {
          scriptFiles.push(fPath)
        }
      } else if (REG_JSON.test(valueExtname)) {
        const vpath = path.resolve(sourceFilePath, '..', value)
        if (jsonFiles.indexOf(vpath) < 0) {
          jsonFiles.push(vpath)
        }
        if (fs.existsSync(vpath)) {
          const obj = JSON.parse(fs.readFileSync(vpath).toString())
          const specifiers = node.specifiers
          let defaultSpecifier = null
          specifiers.forEach(item => {
            if (item.type === 'ImportDefaultSpecifier') {
              defaultSpecifier = item.local.name
            }
          })
          if (defaultSpecifier) {
            let objArr: t.NullLiteral | t.Expression = t.nullLiteral()
            if (Array.isArray(obj)) {
              objArr = t.arrayExpression(convertArrayToAstExpression(obj))
            } else {
              objArr = t.objectExpression(convertObjectToAstExpression(obj))
            }
            astPath.replaceWith(t.variableDeclaration('const', [t.variableDeclarator(t.identifier(defaultSpecifier), objArr)]))
          }
        }
      } else if (REG_FONT.test(valueExtname) || REG_IMAGE.test(valueExtname) || REG_MEDIA.test(valueExtname)) {
        const vpath = path.resolve(sourceFilePath, '..', value)
        if (!fs.existsSync(vpath)) {
          printLog(processTypeEnum.ERROR, '引用文件', `文件 ${sourceFilePath} 中引用 ${value} 不存在！`)
          return
        }
        if (mediaFiles.indexOf(vpath) < 0) {
          mediaFiles.push(vpath)
        }
        const specifiers = node.specifiers
        let defaultSpecifier = null
        specifiers.forEach(item => {
          if (item.type === 'ImportDefaultSpecifier') {
            defaultSpecifier = item.local.name
          }
        })
        let showPath
        if (NODE_MODULES_REG.test(vpath)) {
          showPath = vpath.replace(nodeModulesPath, `/${npmConfig.name}`)
        } else {
          showPath = vpath.replace(sourceDir, '')
        }

        if (defaultSpecifier) {
          astPath.replaceWith(t.variableDeclaration('const', [t.variableDeclarator(t.identifier(defaultSpecifier), t.stringLiteral(showPath.replace(/\\/g, '/')))]))
        } else {
          astPath.remove()
        }
      } else if (REG_STYLE.test(valueExtname)) {
        const stylePath = path.resolve(path.dirname(sourceFilePath), value)
        if (styleFiles.indexOf(stylePath) < 0) {
          styleFiles.push(stylePath)
        }
        astPath.remove()
      } else {
        let vpath = resolveScriptPath(path.resolve(sourceFilePath, '..', value))
        let outputVpath
        if (NODE_MODULES_REG.test(vpath)) {
          outputVpath = vpath.replace(nodeModulesPath, npmOutputDir)
        } else {
          outputVpath = vpath.replace(sourceDir, outputDir)
        }
//.........这里部分代码省略.........

开发者ID:YangShaoQun，项目名称:taro，代码行数:101，代码来源:astProcess.ts

示例8: parseAst


//.........这里部分代码省略.........
              const value = args[0].value
              const valueExtname = path.extname(value)
              if (value.indexOf('.') === 0) {
                let importPath = path.resolve(path.dirname(sourceFilePath), value)
                importPath = resolveScriptPath(importPath)
                if (isFileToBePage(importPath)) {
                  if (astPath.parent.type === 'AssignmentExpression' || 'ExpressionStatement') {
                    astPath.parentPath.remove()
                  } else if (astPath.parent.type === 'VariableDeclarator') {
                    astPath.parentPath.parentPath.remove()
                  } else {
                    astPath.remove()
                  }
                } else {
                  if (REG_STYLE.test(valueExtname)) {
                    const stylePath = path.resolve(path.dirname(sourceFilePath), value)
                    if (styleFiles.indexOf(stylePath) < 0) {
                      styleFiles.push(stylePath)
                    }
                    if (astPath.parent.type === 'AssignmentExpression' || 'ExpressionStatement') {
                      astPath.parentPath.remove()
                    } else if (astPath.parent.type === 'VariableDeclarator') {
                      astPath.parentPath.parentPath.remove()
                    } else {
                      astPath.remove()
                    }
                  } else if (REG_JSON.test(valueExtname)) {
                    const vpath = path.resolve(sourceFilePath, '..', value)
                    if (jsonFiles.indexOf(vpath) < 0) {
                      jsonFiles.push(vpath)
                    }
                    if (fs.existsSync(vpath)) {
                      const obj = JSON.parse(fs.readFileSync(vpath).toString())
                      let objArr: t.NullLiteral | t.Expression | t.ObjectProperty[] = t.nullLiteral()
                      if (Array.isArray(obj)) {
                        objArr = t.arrayExpression(convertArrayToAstExpression(obj))
                      } else {
                        objArr = convertObjectToAstExpression(obj)
                      }
                      astPath.replaceWith(t.objectExpression(objArr as any))
                    }
                  } else if (REG_SCRIPT.test(valueExtname) || REG_TYPESCRIPT.test(valueExtname)) {
                    const vpath = path.resolve(sourceFilePath, '..', value)
                    let fPath = value
                    if (fs.existsSync(vpath) && vpath !== sourceFilePath) {
                      fPath = vpath
                    }
                    if (scriptFiles.indexOf(fPath) < 0) {
                      scriptFiles.push(fPath)
                    }
                  } else if (REG_FONT.test(valueExtname) || REG_IMAGE.test(valueExtname) || REG_MEDIA.test(valueExtname)) {
                    const vpath = path.resolve(sourceFilePath, '..', value)
                    if (mediaFiles.indexOf(vpath) < 0) {
                      mediaFiles.push(vpath)
                    }
                    let showPath
                    if (NODE_MODULES_REG.test(vpath)) {
                      showPath = vpath.replace(nodeModulesPath, `/${npmConfig.name}`)
                    } else {
                      showPath = vpath.replace(sourceDir, '')
                    }
                    astPath.replaceWith(t.stringLiteral(showPath.replace(/\\/g, '/')))
                  } else {
                    let vpath = resolveScriptPath(path.resolve(sourceFilePath, '..', value))
                    let outputVpath
                    if (NODE_MODULES_REG.test(vpath)) {

开发者ID:YangShaoQun，项目名称:taro，代码行数:67，代码来源:astProcess.ts

示例9: setParentCondition

export function setParentCondition (jsx: NodePath<t.Node>, expr: t.Expression, array = false) {
  const conditionExpr = jsx.findParent(p => p.isConditionalExpression())
  const logicExpr = jsx.findParent(p => p.isLogicalExpression({ operator: '&&' }))
  if (array) {
    const logicalJSX = jsx.findParent(p => p.isJSXElement() && p.node.openingElement.attributes.some(a => a.name.name === Adapter.if)) as NodePath<t.JSXElement>
    if (logicalJSX) {
      const attr = logicalJSX.node.openingElement.attributes.find(a => a.name.name === Adapter.if)
      if (attr && t.isJSXExpressionContainer(attr.value)) {
        expr = t.conditionalExpression(attr.value.expression, expr, t.arrayExpression())
        return expr
      }
    }
  }
  if (conditionExpr && conditionExpr.isConditionalExpression()) {
    const consequent = conditionExpr.get('consequent')
    if (consequent === jsx || jsx.findParent(p => p === consequent)) {
      expr = t.conditionalExpression(conditionExpr.get('test').node as any, expr, array ? t.arrayExpression([]) : t.nullLiteral())
    }
  }
  if (logicExpr && logicExpr.isLogicalExpression({ operator: '&&' })) {
    const consequent = logicExpr.get('right')
    if (consequent === jsx || jsx.findParent(p => p === consequent)) {
      expr = t.conditionalExpression(logicExpr.get('left').node as any, expr, array ? t.arrayExpression([]) : t.nullLiteral())
    }
  }
  return expr
}

开发者ID:topud，项目名称:taro，代码行数:27，代码来源:utils.ts

示例10: parseScript

export function parseScript (
  script?: string,
  returned?: t.Expression,
  json?: t.ObjectExpression,
  wxses: WXS[] = [],
  refId?: Set<string>
) {
  script = script || 'Page({})'
  if (t.isJSXText(returned as any)) {
    const block = buildBlockElement()
    block.children = [returned as any]
    returned = block
  }
  let ast = parseCode(script)
  let classDecl!: t.ClassDeclaration
  let foundWXInstance = false
  const vistor: Visitor = {
    BlockStatement (path) {
      path.scope.rename('wx', 'Taro')
    },
    CallExpression (path) {
      const callee = path.get('callee')
      if (callee.isIdentifier()) {
        const name = callee.node.name
        if (name === 'getApp' || name === 'getCurrentPages') {
          callee.replaceWith(
            t.memberExpression(t.identifier('Taro'), callee.node)
          )
        }
      }
      if (callee.isMemberExpression()) {
        const object = callee.get('object')
        if (object.isIdentifier({ name: 'wx' })) {
          object.replaceWith(t.identifier('Taro'))
        }
      }
      if (
        callee.isIdentifier({ name: 'Page' }) ||
        callee.isIdentifier({ name: 'Component' }) ||
        callee.isIdentifier({ name: 'App' })
      ) {
        foundWXInstance = true
        const componentType = callee.node.name
        classDecl = parsePage(
          path,
          returned || t.nullLiteral(),
          json,
          componentType,
          refId,
          wxses
        )
        if (componentType !== 'App' && classDecl.decorators!.length === 0) {
          classDecl.decorators = [buildDecorator(componentType)]
        }
        ast.program.body.push(
          classDecl,
          t.exportDefaultDeclaration(t.identifier(componentType !== 'App' ? defaultClassName : 'App'))
        )
        // path.insertAfter(t.exportDefaultDeclaration(t.identifier(defaultClassName)))
        path.remove()
      }
    }
  }

  traverse(ast, vistor)

  if (!foundWXInstance) {
    ast = parseCode(script + ';Component({})')
    traverse(ast, vistor)
  }

  const taroComponentsImport = buildImportStatement('@tarojs/components', [
    ...usedComponents
  ])
  const taroImport = buildImportStatement('@tarojs/taro', [], 'Taro')
  const withWeappImport = buildImportStatement(
    '@tarojs/with-weapp',
    [],
    'withWeapp'
  )
  ast.program.body.unshift(
    taroComponentsImport,
    taroImport,
    withWeappImport,
    ...wxses.filter(wxs => !wxs.src.startsWith('./wxs__')).map(wxs => buildImportStatement(wxs.src, [], wxs.module))
  )

  return ast
}

开发者ID:YangShaoQun，项目名称:taro，代码行数:89，代码来源:script.ts

注：本文中的babel-types.nullLiteral函数示例整理自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。