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walkIdentifiers() — vue Function Reference

Architecture documentation for the walkIdentifiers() function in babelUtils.ts from the vue codebase.

Function typescript CompilerSFC StyleProcessor calls 5 called by 3

Entity Profile

Dependency Diagram

graph TD
  6821e51e_382f_8ff8_ca9d_3b77f896018a["walkIdentifiers()"]
  946e0fa6_6c05_b820_0bd7_980d6d869192["babelUtils.ts"]
  6821e51e_382f_8ff8_ca9d_3b77f896018a -->|defined in| 946e0fa6_6c05_b820_0bd7_980d6d869192
  6195696d_b4e9_b5d7_3dd5_1966a03d855f["compileScript()"]
  6195696d_b4e9_b5d7_3dd5_1966a03d855f -->|calls| 6821e51e_382f_8ff8_ca9d_3b77f896018a
  72c10b69_fb02_fbf6_63d5_43832727d4f7["processExp()"]
  72c10b69_fb02_fbf6_63d5_43832727d4f7 -->|calls| 6821e51e_382f_8ff8_ca9d_3b77f896018a
  fefea729_cf80_e4f2_675b_000b41fc85a5["prefixIdentifiers()"]
  fefea729_cf80_e4f2_675b_000b41fc85a5 -->|calls| 6821e51e_382f_8ff8_ca9d_3b77f896018a
  6a4dcb82_14bf_768b_c362_246755645991["isReferencedIdentifier()"]
  6821e51e_382f_8ff8_ca9d_3b77f896018a -->|calls| 6a4dcb82_14bf_768b_c362_246755645991
  2da3a667_48eb_9608_1220_cf672cac17b7["isFunctionType()"]
  6821e51e_382f_8ff8_ca9d_3b77f896018a -->|calls| 2da3a667_48eb_9608_1220_cf672cac17b7
  414e5246_5f40_b96a_8130_5a96cb9d8426["walkFunctionParams()"]
  6821e51e_382f_8ff8_ca9d_3b77f896018a -->|calls| 414e5246_5f40_b96a_8130_5a96cb9d8426
  7e8e68e9_ea35_71dc_11c1_49e8bba80b55["markScopeIdentifier()"]
  6821e51e_382f_8ff8_ca9d_3b77f896018a -->|calls| 7e8e68e9_ea35_71dc_11c1_49e8bba80b55
  5e4207f6_76c5_de5d_945f_5dc740607887["walkBlockDeclarations()"]
  6821e51e_382f_8ff8_ca9d_3b77f896018a -->|calls| 5e4207f6_76c5_de5d_945f_5dc740607887
  style 6821e51e_382f_8ff8_ca9d_3b77f896018a fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/compiler-sfc/src/babelUtils.ts lines 15–85

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]
          }
        }
      }
    }
  })
}

Domain

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Defined In

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Source

Frequently Asked Questions

What does walkIdentifiers() do?
walkIdentifiers() is a function in the vue codebase, defined in packages/compiler-sfc/src/babelUtils.ts.
Where is walkIdentifiers() defined?
walkIdentifiers() is defined in packages/compiler-sfc/src/babelUtils.ts at line 15.
What does walkIdentifiers() call?
walkIdentifiers() calls 5 function(s): isFunctionType, isReferencedIdentifier, markScopeIdentifier, walkBlockDeclarations, walkFunctionParams.
What calls walkIdentifiers()?
walkIdentifiers() is called by 3 function(s): compileScript, prefixIdentifiers, processExp.

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