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Current File : /home/web/dev.agtindia.co.in/lrg-report/node_modules/vue/packages/compiler-sfc/src/babelUtils.ts
// https://github.com/vuejs/core/blob/main/packages/compiler-core/src/babelUtils.ts

// should only use types from @babel/types
// do not import runtime methods
import type {
  Identifier,
  Node,
  Function,
  ObjectProperty,
  BlockStatement,
  Program
} from '@babel/types'
import { walk } from 'estree-walker'

export function walkIdentifiers(
  root: Node,
  onIdentifier: (
    node: Identifier,
    parent: Node,
    parentStack: Node[],
    isReference: boolean,
    isLocal: boolean
  ) => void,
  onNode?: (node: Node) => void
) {
  const includeAll = false
  const parentStack: Node[] = []
  const knownIds: Record<string, number> = Object.create(null)

  const rootExp =
    root.type === 'Program' &&
    root.body[0].type === 'ExpressionStatement' &&
    root.body[0].expression

  ;(walk as any)(root, {
    enter(node: Node & { scopeIds?: Set<string> }, parent: Node | undefined) {
      parent && parentStack.push(parent)
      if (
        parent &&
        parent.type.startsWith('TS') &&
        parent.type !== 'TSAsExpression' &&
        parent.type !== 'TSNonNullExpression' &&
        parent.type !== 'TSTypeAssertion'
      ) {
        return this.skip()
      }

      if (onNode) onNode(node)

      if (node.type === 'Identifier') {
        const isLocal = !!knownIds[node.name]
        const isRefed = isReferencedIdentifier(node, parent!, parentStack)
        if (includeAll || (isRefed && !isLocal)) {
          onIdentifier(node, parent!, parentStack, isRefed, isLocal)
        }
      } else if (
        node.type === 'ObjectProperty' &&
        parent!.type === 'ObjectPattern'
      ) {
        // mark property in destructure pattern
        ;(node as any).inPattern = true
      } else if (isFunctionType(node)) {
        // walk function expressions and add its arguments to known identifiers
        // so that we don't prefix them
        walkFunctionParams(node, id => markScopeIdentifier(node, id, knownIds))
      } else if (node.type === 'BlockStatement') {
        // #3445 record block-level local variables
        walkBlockDeclarations(node, id =>
          markScopeIdentifier(node, id, knownIds)
        )
      }
    },
    leave(node: Node & { scopeIds?: Set<string> }, parent: Node | undefined) {
      parent && parentStack.pop()
      if (node !== rootExp && node.scopeIds) {
        for (const id of node.scopeIds) {
          knownIds[id]--
          if (knownIds[id] === 0) {
            delete knownIds[id]
          }
        }
      }
    }
  })
}

export function isReferencedIdentifier(
  id: Identifier,
  parent: Node | null,
  parentStack: Node[]
) {
  if (!parent) {
    return true
  }

  // is a special keyword but parsed as identifier
  if (id.name === 'arguments') {
    return false
  }

  if (isReferenced(id, parent)) {
    return true
  }

  // babel's isReferenced check returns false for ids being assigned to, so we
  // need to cover those cases here
  switch (parent.type) {
    case 'AssignmentExpression':
    case 'AssignmentPattern':
      return true
    case 'ObjectPattern':
    case 'ArrayPattern':
      return isInDestructureAssignment(parent, parentStack)
  }

  return false
}

export function isInDestructureAssignment(
  parent: Node,
  parentStack: Node[]
): boolean {
  if (
    parent &&
    (parent.type === 'ObjectProperty' || parent.type === 'ArrayPattern')
  ) {
    let i = parentStack.length
    while (i--) {
      const p = parentStack[i]
      if (p.type === 'AssignmentExpression') {
        return true
      } else if (p.type !== 'ObjectProperty' && !p.type.endsWith('Pattern')) {
        break
      }
    }
  }
  return false
}

export function walkFunctionParams(
  node: Function,
  onIdent: (id: Identifier) => void
) {
  for (const p of node.params) {
    for (const id of extractIdentifiers(p)) {
      onIdent(id)
    }
  }
}

export function walkBlockDeclarations(
  block: BlockStatement | Program,
  onIdent: (node: Identifier) => void
) {
  for (const stmt of block.body) {
    if (stmt.type === 'VariableDeclaration') {
      if (stmt.declare) continue
      for (const decl of stmt.declarations) {
        for (const id of extractIdentifiers(decl.id)) {
          onIdent(id)
        }
      }
    } else if (
      stmt.type === 'FunctionDeclaration' ||
      stmt.type === 'ClassDeclaration'
    ) {
      if (stmt.declare || !stmt.id) continue
      onIdent(stmt.id)
    }
  }
}

export function extractIdentifiers(
  param: Node,
  nodes: Identifier[] = []
): Identifier[] {
  switch (param.type) {
    case 'Identifier':
      nodes.push(param)
      break

    case 'MemberExpression':
      let object: any = param
      while (object.type === 'MemberExpression') {
        object = object.object
      }
      nodes.push(object)
      break

    case 'ObjectPattern':
      for (const prop of param.properties) {
        if (prop.type === 'RestElement') {
          extractIdentifiers(prop.argument, nodes)
        } else {
          extractIdentifiers(prop.value, nodes)
        }
      }
      break

    case 'ArrayPattern':
      param.elements.forEach(element => {
        if (element) extractIdentifiers(element, nodes)
      })
      break

    case 'RestElement':
      extractIdentifiers(param.argument, nodes)
      break

    case 'AssignmentPattern':
      extractIdentifiers(param.left, nodes)
      break
  }

  return nodes
}

function markScopeIdentifier(
  node: Node & { scopeIds?: Set<string> },
  child: Identifier,
  knownIds: Record<string, number>
) {
  const { name } = child
  if (node.scopeIds && node.scopeIds.has(name)) {
    return
  }
  if (name in knownIds) {
    knownIds[name]++
  } else {
    knownIds[name] = 1
  }
  ;(node.scopeIds || (node.scopeIds = new Set())).add(name)
}

export const isFunctionType = (node: Node): node is Function => {
  return /Function(?:Expression|Declaration)$|Method$/.test(node.type)
}

export const isStaticProperty = (node: Node): node is ObjectProperty =>
  node &&
  (node.type === 'ObjectProperty' || node.type === 'ObjectMethod') &&
  !node.computed

export const isStaticPropertyKey = (node: Node, parent: Node) =>
  isStaticProperty(parent) && parent.key === node

/**
 * Copied from https://github.com/babel/babel/blob/main/packages/babel-types/src/validators/isReferenced.ts
 * To avoid runtime dependency on @babel/types (which includes process references)
 * This file should not change very often in babel but we may need to keep it
 * up-to-date from time to time.
 *
 * https://github.com/babel/babel/blob/main/LICENSE
 *
 */
function isReferenced(node: Node, parent: Node, grandparent?: Node): boolean {
  switch (parent.type) {
    // yes: PARENT[NODE]
    // yes: NODE.child
    // no: parent.NODE
    case 'MemberExpression':
    case 'OptionalMemberExpression':
      if (parent.property === node) {
        return !!parent.computed
      }
      return parent.object === node

    case 'JSXMemberExpression':
      return parent.object === node
    // no: let NODE = init;
    // yes: let id = NODE;
    case 'VariableDeclarator':
      return parent.init === node

    // yes: () => NODE
    // no: (NODE) => {}
    case 'ArrowFunctionExpression':
      return parent.body === node

    // no: class { #NODE; }
    // no: class { get #NODE() {} }
    // no: class { #NODE() {} }
    // no: class { fn() { return this.#NODE; } }
    case 'PrivateName':
      return false

    // no: class { NODE() {} }
    // yes: class { [NODE]() {} }
    // no: class { foo(NODE) {} }
    case 'ClassMethod':
    case 'ClassPrivateMethod':
    case 'ObjectMethod':
      if (parent.key === node) {
        return !!parent.computed
      }
      return false

    // yes: { [NODE]: "" }
    // no: { NODE: "" }
    // depends: { NODE }
    // depends: { key: NODE }
    case 'ObjectProperty':
      if (parent.key === node) {
        return !!parent.computed
      }
      // parent.value === node
      return !grandparent || grandparent.type !== 'ObjectPattern'
    // no: class { NODE = value; }
    // yes: class { [NODE] = value; }
    // yes: class { key = NODE; }
    case 'ClassProperty':
      if (parent.key === node) {
        return !!parent.computed
      }
      return true
    case 'ClassPrivateProperty':
      return parent.key !== node

    // no: class NODE {}
    // yes: class Foo extends NODE {}
    case 'ClassDeclaration':
    case 'ClassExpression':
      return parent.superClass === node

    // yes: left = NODE;
    // no: NODE = right;
    case 'AssignmentExpression':
      return parent.right === node

    // no: [NODE = foo] = [];
    // yes: [foo = NODE] = [];
    case 'AssignmentPattern':
      return parent.right === node

    // no: NODE: for (;;) {}
    case 'LabeledStatement':
      return false

    // no: try {} catch (NODE) {}
    case 'CatchClause':
      return false

    // no: function foo(...NODE) {}
    case 'RestElement':
      return false

    case 'BreakStatement':
    case 'ContinueStatement':
      return false

    // no: function NODE() {}
    // no: function foo(NODE) {}
    case 'FunctionDeclaration':
    case 'FunctionExpression':
      return false

    // no: export NODE from "foo";
    // no: export * as NODE from "foo";
    case 'ExportNamespaceSpecifier':
    case 'ExportDefaultSpecifier':
      return false

    // no: export { foo as NODE };
    // yes: export { NODE as foo };
    // no: export { NODE as foo } from "foo";
    case 'ExportSpecifier':
      // @ts-expect-error
      if (grandparent?.source) {
        return false
      }
      return parent.local === node

    // no: import NODE from "foo";
    // no: import * as NODE from "foo";
    // no: import { NODE as foo } from "foo";
    // no: import { foo as NODE } from "foo";
    // no: import NODE from "bar";
    case 'ImportDefaultSpecifier':
    case 'ImportNamespaceSpecifier':
    case 'ImportSpecifier':
      return false

    // no: import "foo" assert { NODE: "json" }
    case 'ImportAttribute':
      return false

    // no: <div NODE="foo" />
    case 'JSXAttribute':
      return false

    // no: [NODE] = [];
    // no: ({ NODE }) = [];
    case 'ObjectPattern':
    case 'ArrayPattern':
      return false

    // no: new.NODE
    // no: NODE.target
    case 'MetaProperty':
      return false

    // yes: type X = { someProperty: NODE }
    // no: type X = { NODE: OtherType }
    case 'ObjectTypeProperty':
      return parent.key !== node

    // yes: enum X { Foo = NODE }
    // no: enum X { NODE }
    case 'TSEnumMember':
      return parent.id !== node

    // yes: { [NODE]: value }
    // no: { NODE: value }
    case 'TSPropertySignature':
      if (parent.key === node) {
        return !!parent.computed
      }

      return true
  }

  return true
}

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