TypeScript babel-types.isLiteral函数代码示例

export function convertAstExpressionToVariable (node) {
  if (t.isObjectExpression(node)) {
    const obj = {}
    const properties = node.properties
    properties.forEach(property => {
      if (property.type === 'ObjectProperty' || property.type === 'ObjectMethod') {
        const key = convertAstExpressionToVariable(property.key)
        const value = convertAstExpressionToVariable(property.value)
        obj[key] = value
      }
    })
    return obj
  } else if (t.isArrayExpression(node)) {
    return node.elements.map(convertAstExpressionToVariable)
  } else if (t.isLiteral(node)) {
    return node['value']
  } else if (t.isIdentifier(node) || t.isJSXIdentifier(node)) {
    const name = node.name
    return name === 'undefined'
      ? undefined
      : name
  } else if (t.isJSXExpressionContainer(node)) {
    return convertAstExpressionToVariable(node.expression)
  }
}

export function getIsValue(node: babel.ClassDeclaration|
                           babel.ClassExpression): string|undefined {
  const getterValue = getStaticGetterValue(node, 'is');
  if (!getterValue || !babel.isLiteral(getterValue)) {
    // we only support literals
    return undefined;
  }
  const value = astValue.expressionToValue(getterValue);
  if (typeof value !== 'string') {
    return undefined;
  }
  return value;
}

export function objectKeyToString(key: babel.Node): string|undefined {
  if (babel.isIdentifier(key)) {
    return key.name;
  }
  if (babel.isLiteral(key)) {
    return '' + astValue.expressionToValue(key);
  }
  if (babel.isMemberExpression(key)) {
    return objectKeyToString(key.object) + '.' +
        objectKeyToString(key.property);
  }
  return undefined;
}

    scannedMethod.params = (value.params || []).map((nodeParam) => {
      let name;
      let defaultValue;
      let rest;

      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) &&
          babel.isLiteral(nodeParam.right)) {
        // 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 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.........

//.........这里部分代码省略.........
          path.node.name = t.jSXIdentifier('View')
          const store = path.node.attributes.find(attr => attr.name.name === 'store')
          if (store && t.isJSXExpressionContainer(store.value) && t.isIdentifier(store.value.expression)) {
            storeName = store.value.expression.name
          }
          path.node.attributes = []
        }
      }

      if (IMAGE_COMPONENTS.has(name)) {
        for (const attr of path.node.attributes) {
          if (
            attr.name.name === 'src'
          ) {
            if (t.isStringLiteral(attr.value)) {
              imageSource.add(attr.value.value)
            } else if (t.isJSXExpressionContainer(attr.value)) {
              if (t.isStringLiteral(attr.value.expression)) {
                imageSource.add(attr.value.expression.value)
              }
            }
          }
        }
      }
    },
    JSXAttribute (path) {
      const { name, value } = path.node
      if (!t.isJSXIdentifier(name) || value === null || t.isStringLiteral(value) || t.isJSXElement(value)) {
        return
      }

      const expr = value.expression as any
      const exprPath = path.get('value.expression')
      if (!t.isBinaryExpression(expr, { operator: '+' }) && !t.isLiteral(expr) && name.name === 'style') {
        const jsxID = path.findParent(p => p.isJSXOpeningElement()).get('name')
        if (jsxID && jsxID.isJSXIdentifier() && DEFAULT_Component_SET.has(jsxID.node.name)) {
          exprPath.replaceWith(
            t.callExpression(t.identifier(INTERNAL_INLINE_STYLE), [expr])
          )
        }
      }

      if (name.name.startsWith('on')) {
        if (exprPath.isReferencedIdentifier()) {
          const ids = [expr.name]
          const fullPath = buildFullPathThisPropsRef(expr, ids, path)
          if (fullPath) {
            exprPath.replaceWith(fullPath)
          }
        }

        if (exprPath.isReferencedMemberExpression()) {
          const id = findFirstIdentifierFromMemberExpression(expr)
          const ids = getIdsFromMemberProps(expr)
          if (t.isIdentifier(id)) {
            const fullPath = buildFullPathThisPropsRef(id, ids, path)
            if (fullPath) {
              exprPath.replaceWith(fullPath)
            }
          }
        }

        // @TODO: bind 的处理待定
      }
    },
    ImportDeclaration (path) {

 return args.every(p => t.isLiteral(p))

//.........这里部分代码省略.........
          path.node.name = t.jSXIdentifier('View')
          const store = path.node.attributes.find(attr => attr.name.name === 'store')
          if (store && t.isJSXExpressionContainer(store.value) && t.isIdentifier(store.value.expression)) {
            storeName = store.value.expression.name
          }
          path.node.attributes = []
        }
      }

      if (IMAGE_COMPONENTS.has(name)) {
        for (const attr of path.node.attributes) {
          if (
            t.isIdentifier(attr) &&
            attr.name.name === 'src'
          ) {
            if (t.isStringLiteral(attr.value)) {
              imageSource.add(attr.value.value)
            } else if (t.isJSXExpressionContainer(attr.value)) {
              if (t.isStringLiteral(attr.value.expression)) {
                imageSource.add(attr.value.expression.value)
              }
            }
          }
        }
      }
    },
    JSXAttribute (path) {
      const { name, value } = path.node
      if (!t.isJSXIdentifier(name) || value === null || t.isStringLiteral(value) || t.isJSXElement(value)) {
        return
      }

      const expr = value.expression
      if (t.isBinaryExpression(expr, { operator: '+' }) || t.isLiteral(expr) || name.name !== 'style') {
        return
      }

      path.get('value.expression').replaceWith(
        t.callExpression(t.identifier(INTERNAL_INLINE_STYLE), [expr])
      )
    },
    ImportDeclaration (path) {
      const source = path.node.source.value
      const names: string[] = []
      if (source === TARO_PACKAGE_NAME) {
        path.node.specifiers.push(
          t.importSpecifier(t.identifier(INTERNAL_SAFE_GET), t.identifier(INTERNAL_SAFE_GET)),
          t.importSpecifier(t.identifier(INTERNAL_DYNAMIC), t.identifier(INTERNAL_DYNAMIC)),
          t.importSpecifier(t.identifier(INTERNAL_INLINE_STYLE), t.identifier(INTERNAL_INLINE_STYLE))
        )
      }
      if (
        source === REDUX_PACKAGE_NAME
      ) {
        path.node.specifiers.forEach((s, index, specs) => {
          if (s.local.name === 'Provider') {
            specs.splice(index, 1)
            specs.push(
              t.importSpecifier(t.identifier('setStore'), t.identifier('setStore'))
            )
          }
        })
      }
      path.traverse({
        ImportDefaultSpecifier (path) {
          const name = path.node.local.name

 nodes = nodes.filter((n) => !t.isLiteral(n, { value: '' }))

function isString (node) {
  return t.isLiteral(node as any) && typeof node.value === 'string'
}