traverse.js 21 KB

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  1. import { deprecate } from '@glimmer/util';
  2. import visitorKeys from '../v1/visitor-keys';
  3. import { cannotRemoveNode, cannotReplaceNode, cannotReplaceOrRemoveInKeyHandlerYet } from './errors';
  4. import WalkerPath from './path';
  5. function getEnterFunction(handler) {
  6. if (typeof handler === 'function') {
  7. return handler;
  8. } else {
  9. return handler.enter;
  10. }
  11. }
  12. function getExitFunction(handler) {
  13. if (typeof handler === 'function') {
  14. return undefined;
  15. } else {
  16. return handler.exit;
  17. }
  18. }
  19. function getKeyHandler(handler, key) {
  20. var keyVisitor = typeof handler !== 'function' ? handler.keys : undefined;
  21. if (keyVisitor === undefined) return;
  22. var keyHandler = keyVisitor[key];
  23. if (keyHandler !== undefined) {
  24. return keyHandler;
  25. }
  26. return keyVisitor.All;
  27. }
  28. function getNodeHandler(visitor, nodeType) {
  29. if (nodeType === 'Template' || nodeType === 'Block') {
  30. if (visitor.Program) {
  31. if (false
  32. /* LOCAL_DEBUG */
  33. ) {
  34. false && !false && deprecate("The 'Program' visitor node is deprecated. Use 'Template' or 'Block' instead (node was '" + nodeType + "') ");
  35. }
  36. return visitor.Program;
  37. }
  38. }
  39. var handler = visitor[nodeType];
  40. if (handler !== undefined) {
  41. return handler;
  42. }
  43. return visitor.All;
  44. }
  45. function visitNode(visitor, path) {
  46. var node = path.node,
  47. parent = path.parent,
  48. parentKey = path.parentKey;
  49. var handler = getNodeHandler(visitor, node.type);
  50. var enter;
  51. var exit;
  52. if (handler !== undefined) {
  53. enter = getEnterFunction(handler);
  54. exit = getExitFunction(handler);
  55. }
  56. var result;
  57. if (enter !== undefined) {
  58. result = enter(node, path);
  59. }
  60. if (result !== undefined && result !== null) {
  61. if (JSON.stringify(node) === JSON.stringify(result)) {
  62. result = undefined;
  63. } else if (Array.isArray(result)) {
  64. visitArray(visitor, result, parent, parentKey);
  65. return result;
  66. } else {
  67. var _path = new WalkerPath(result, parent, parentKey);
  68. return visitNode(visitor, _path) || result;
  69. }
  70. }
  71. if (result === undefined) {
  72. var keys = visitorKeys[node.type];
  73. for (var i = 0; i < keys.length; i++) {
  74. var key = keys[i]; // we know if it has child keys we can widen to a ParentNode
  75. visitKey(visitor, handler, path, key);
  76. }
  77. if (exit !== undefined) {
  78. result = exit(node, path);
  79. }
  80. }
  81. return result;
  82. }
  83. function get(node, key) {
  84. return node[key];
  85. }
  86. function set(node, key, value) {
  87. node[key] = value;
  88. }
  89. function visitKey(visitor, handler, path, key) {
  90. var node = path.node;
  91. var value = get(node, key);
  92. if (!value) {
  93. return;
  94. }
  95. var keyEnter;
  96. var keyExit;
  97. if (handler !== undefined) {
  98. var keyHandler = getKeyHandler(handler, key);
  99. if (keyHandler !== undefined) {
  100. keyEnter = getEnterFunction(keyHandler);
  101. keyExit = getExitFunction(keyHandler);
  102. }
  103. }
  104. if (keyEnter !== undefined) {
  105. if (keyEnter(node, key) !== undefined) {
  106. throw cannotReplaceOrRemoveInKeyHandlerYet(node, key);
  107. }
  108. }
  109. if (Array.isArray(value)) {
  110. visitArray(visitor, value, path, key);
  111. } else {
  112. var keyPath = new WalkerPath(value, path, key);
  113. var result = visitNode(visitor, keyPath);
  114. if (result !== undefined) {
  115. // TODO: dynamically check the results by having a table of
  116. // expected node types in value space, not just type space
  117. // eslint-disable-next-line @typescript-eslint/no-explicit-any
  118. assignKey(node, key, value, result);
  119. }
  120. }
  121. if (keyExit !== undefined) {
  122. if (keyExit(node, key) !== undefined) {
  123. throw cannotReplaceOrRemoveInKeyHandlerYet(node, key);
  124. }
  125. }
  126. }
  127. function visitArray(visitor, array, parent, parentKey) {
  128. for (var i = 0; i < array.length; i++) {
  129. var node = array[i];
  130. var path = new WalkerPath(node, parent, parentKey);
  131. var result = visitNode(visitor, path);
  132. if (result !== undefined) {
  133. i += spliceArray(array, i, result) - 1;
  134. }
  135. }
  136. }
  137. function assignKey(node, key, value, result) {
  138. if (result === null) {
  139. throw cannotRemoveNode(value, node, key);
  140. } else if (Array.isArray(result)) {
  141. if (result.length === 1) {
  142. set(node, key, result[0]);
  143. } else {
  144. if (result.length === 0) {
  145. throw cannotRemoveNode(value, node, key);
  146. } else {
  147. throw cannotReplaceNode(value, node, key);
  148. }
  149. }
  150. } else {
  151. set(node, key, result);
  152. }
  153. }
  154. function spliceArray(array, index, result) {
  155. if (result === null) {
  156. array.splice(index, 1);
  157. return 0;
  158. } else if (Array.isArray(result)) {
  159. array.splice.apply(array, [index, 1].concat(result));
  160. return result.length;
  161. } else {
  162. array.splice(index, 1, result);
  163. return 1;
  164. }
  165. }
  166. export default function traverse(node, visitor) {
  167. var path = new WalkerPath(node);
  168. visitNode(visitor, path);
  169. }
  170. //# 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{ LOCAL_DEBUG } from '@glimmer/local-debug-flags';\nimport { deprecate } from '@glimmer/util';\n\nimport * as ASTv1 from '../v1/api';\nimport visitorKeys, { VisitorKey, VisitorKeys } from '../v1/visitor-keys';\nimport {\n  cannotRemoveNode,\n  cannotReplaceNode,\n  cannotReplaceOrRemoveInKeyHandlerYet,\n} from './errors';\nimport WalkerPath from './path';\nimport { KeyHandler, KeyTraversal, NodeHandler, NodeTraversal, NodeVisitor } from './visitor';\n\nfunction getEnterFunction<N extends ASTv1.Node>(\n  handler: NodeTraversal<N>\n): NodeHandler<N> | undefined;\nfunction getEnterFunction<N extends ASTv1.Node, K extends VisitorKey<N>>(\n  handler: KeyTraversal<N, K>\n): KeyHandler<N, K> | undefined;\nfunction getEnterFunction<N extends ASTv1.Node, K extends VisitorKey<N>>(\n  handler: NodeTraversal<N> | KeyTraversal<N, K>\n): NodeHandler<N> | KeyHandler<N, K> | undefined {\n  if (typeof handler === 'function') {\n    return handler;\n  } else {\n    return handler.enter as NodeHandler<N> | KeyHandler<N, K>;\n  }\n}\n\nfunction getExitFunction<N extends ASTv1.Node>(\n  handler: NodeTraversal<N>\n): NodeHandler<N> | undefined;\nfunction getExitFunction<N extends ASTv1.Node, K extends VisitorKey<N>>(\n  handler: KeyTraversal<N, K>\n): KeyHandler<N, K> | undefined;\nfunction getExitFunction<N extends ASTv1.Node, K extends VisitorKey<N>>(\n  handler: NodeTraversal<N> | KeyTraversal<N, K>\n): NodeHandler<N> | KeyHandler<N, K> | undefined {\n  if (typeof handler === 'function') {\n    return undefined;\n  } else {\n    return handler.exit as NodeHandler<N> | KeyHandler<N, K>;\n  }\n}\n\nfunction getKeyHandler<N extends ASTv1.Node, K extends VisitorKey<N>>(\n  handler: NodeTraversal<N>,\n  key: K\n): KeyTraversal<N, K> | KeyTraversal<N, VisitorKey<N>> | undefined {\n  let keyVisitor = typeof handler !== 'function' ? handler.keys : undefined;\n  if (keyVisitor === undefined) return;\n\n  let keyHandler = keyVisitor[key];\n  if (keyHandler !== undefined) {\n    return keyHandler as KeyTraversal<N, K>;\n  }\n  return keyVisitor.All;\n}\n\nfunction getNodeHandler<N extends ASTv1.Node>(\n  visitor: NodeVisitor,\n  nodeType: N['type']\n): NodeTraversal<N>;\nfunction getNodeHandler(visitor: NodeVisitor, nodeType: 'All'): NodeTraversal<ASTv1.Node>;\nfunction getNodeHandler<N extends ASTv1.Node>(\n  visitor: NodeVisitor,\n  nodeType: N['type']\n): NodeTraversal<ASTv1.Node> | undefined {\n  if (nodeType === 'Template' || nodeType === 'Block') {\n    if (visitor.Program) {\n      if (LOCAL_DEBUG) {\n        deprecate(\n          `The 'Program' visitor node is deprecated. Use 'Template' or 'Block' instead (node was '${nodeType}') `\n        );\n      }\n\n      return visitor.Program as NodeTraversal<ASTv1.Node>;\n    }\n  }\n\n  let handler = visitor[nodeType];\n  if (handler !== undefined) {\n    return (handler as unknown) as NodeTraversal<ASTv1.Node>;\n  }\n  return visitor.All;\n}\n\nfunction visitNode<N extends ASTv1.Node>(\n  visitor: NodeVisitor,\n  path: WalkerPath<N>\n): ASTv1.Node | ASTv1.Node[] | undefined | null | void {\n  let { node, parent, parentKey } = path;\n\n  let handler: NodeTraversal<N> = getNodeHandler(visitor, node.type);\n  let enter;\n  let exit;\n\n  if (handler !== undefined) {\n    enter = getEnterFunction(handler);\n    exit = getExitFunction(handler);\n  }\n\n  let result: ASTv1.Node | ASTv1.Node[] | undefined | null | void;\n  if (enter !== undefined) {\n    result = enter(node, path);\n  }\n\n  if (result !== undefined && result !== null) {\n    if (JSON.stringify(node) === JSON.stringify(result)) {\n      result = undefined;\n    } else if (Array.isArray(result)) {\n      visitArray(visitor, result, parent, parentKey);\n      return result;\n    } else {\n      let path = new WalkerPath(result, parent, parentKey);\n      return visitNode(visitor, path) || result;\n    }\n  }\n\n  if (result === undefined) {\n    let keys = visitorKeys[node.type];\n\n    for (let i = 0; i < keys.length; i++) {\n      let key = keys[i] as VisitorKeys[N['type']] & keyof N;\n      // we know if it has child keys we can widen to a ParentNode\n      visitKey(visitor, handler, path, key);\n    }\n\n    if (exit !== undefined) {\n      result = exit(node, path);\n    }\n  }\n\n  return result;\n}\n\nfunction get<N extends ASTv1.Node>(\n  node: N,\n  key: VisitorKeys[N['type']] & keyof N\n): ASTv1.Node | ASTv1.Node[] {\n  return (node[key] as unknown) as ASTv1.Node | ASTv1.Node[];\n}\n\nfunction set<N extends ASTv1.Node, K extends keyof N>(node: N, key: K, value: N[K]): void {\n  node[key] = value;\n}\n\nfunction visitKey<N extends ASTv1.Node>(\n  visitor: NodeVisitor,\n  handler: NodeTraversal<N>,\n  path: WalkerPath<N>,\n  key: VisitorKeys[N['type']] & keyof N\n) {\n  let { node } = path;\n\n  let value = get(node, key);\n  if (!value) {\n    return;\n  }\n\n  let keyEnter;\n  let keyExit;\n\n  if (handler !== undefined) {\n    let keyHandler = getKeyHandler(handler, key);\n    if (keyHandler !== undefined) {\n      keyEnter = getEnterFunction(keyHandler);\n      keyExit = getExitFunction(keyHandler);\n    }\n  }\n\n  if (keyEnter !== undefined) {\n    if (keyEnter(node, key) !== undefined) {\n      throw cannotReplaceOrRemoveInKeyHandlerYet(node, key);\n    }\n  }\n\n  if (Array.isArray(value)) {\n    visitArray(visitor, value, path, key);\n  } else {\n    let keyPath = new WalkerPath(value, path, key);\n    let result = visitNode(visitor, keyPath);\n    if (result !== undefined) {\n      // TODO: dynamically check the results by having a table of\n      // expected node types in value space, not just type space\n      // eslint-disable-next-line @typescript-eslint/no-explicit-any\n      assignKey(node, key, value, result as any);\n    }\n  }\n\n  if (keyExit !== undefined) {\n    if (keyExit(node, key) !== undefined) {\n      throw cannotReplaceOrRemoveInKeyHandlerYet(node, key);\n    }\n  }\n}\n\nfunction visitArray(\n  visitor: NodeVisitor,\n  array: ASTv1.Node[],\n  parent: WalkerPath<ASTv1.Node> | null,\n  parentKey: string | null\n) {\n  for (let i = 0; i < array.length; i++) {\n    let node = array[i];\n    let path = new WalkerPath(node, parent, parentKey);\n    let result = visitNode(visitor, path);\n    if (result !== undefined) {\n      i += spliceArray(array, i, result) - 1;\n    }\n  }\n}\n\nfunction assignKey<N extends ASTv1.Node, K extends VisitorKey<N>>(\n  node: N,\n  key: K,\n  value: ASTv1.Node,\n  result: N[K] | [N[K]] | null\n) {\n  if (result === null) {\n    throw cannotRemoveNode(value, node, key);\n  } else if (Array.isArray(result)) {\n    if (result.length === 1) {\n      set(node, key, result[0]);\n    } else {\n      if (result.length === 0) {\n        throw cannotRemoveNode(value, node, key);\n      } else {\n        throw cannotReplaceNode(value, node, key);\n      }\n    }\n  } else {\n    set(node, key, result);\n  }\n}\n\nfunction spliceArray(array: ASTv1.Node[], index: number, result: ASTv1.Node | ASTv1.Node[] | null) {\n  if (result === null) {\n    array.splice(index, 1);\n    return 0;\n  } else if (Array.isArray(result)) {\n    array.splice(index, 1, ...result);\n    return result.length;\n  } else {\n    array.splice(index, 1, result);\n    return 1;\n  }\n}\n\nexport default function traverse(node: ASTv1.Node, visitor: NodeVisitor): void {\n  let path = new WalkerPath(node);\n  visitNode(visitor, path);\n}\n"],"sourceRoot":""}