legacy.js 4.7 KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", { value: true });
  3. exports.getElementsByTagType = exports.getElementsByTagName = exports.getElementById = exports.getElements = exports.testElement = void 0;
  4. var domhandler_1 = require("domhandler");
  5. var querying_1 = require("./querying");
  6. var Checks = {
  7. tag_name: function (name) {
  8. if (typeof name === "function") {
  9. return function (elem) { return (0, domhandler_1.isTag)(elem) && name(elem.name); };
  10. }
  11. else if (name === "*") {
  12. return domhandler_1.isTag;
  13. }
  14. return function (elem) { return (0, domhandler_1.isTag)(elem) && elem.name === name; };
  15. },
  16. tag_type: function (type) {
  17. if (typeof type === "function") {
  18. return function (elem) { return type(elem.type); };
  19. }
  20. return function (elem) { return elem.type === type; };
  21. },
  22. tag_contains: function (data) {
  23. if (typeof data === "function") {
  24. return function (elem) { return (0, domhandler_1.isText)(elem) && data(elem.data); };
  25. }
  26. return function (elem) { return (0, domhandler_1.isText)(elem) && elem.data === data; };
  27. },
  28. };
  29. /**
  30. * @param attrib Attribute to check.
  31. * @param value Attribute value to look for.
  32. * @returns A function to check whether the a node has an attribute with a particular value.
  33. */
  34. function getAttribCheck(attrib, value) {
  35. if (typeof value === "function") {
  36. return function (elem) { return (0, domhandler_1.isTag)(elem) && value(elem.attribs[attrib]); };
  37. }
  38. return function (elem) { return (0, domhandler_1.isTag)(elem) && elem.attribs[attrib] === value; };
  39. }
  40. /**
  41. * @param a First function to combine.
  42. * @param b Second function to combine.
  43. * @returns A function taking a node and returning `true` if either
  44. * of the input functions returns `true` for the node.
  45. */
  46. function combineFuncs(a, b) {
  47. return function (elem) { return a(elem) || b(elem); };
  48. }
  49. /**
  50. * @param options An object describing nodes to look for.
  51. * @returns A function executing all checks in `options` and returning `true`
  52. * if any of them match a node.
  53. */
  54. function compileTest(options) {
  55. var funcs = Object.keys(options).map(function (key) {
  56. var value = options[key];
  57. return Object.prototype.hasOwnProperty.call(Checks, key)
  58. ? Checks[key](value)
  59. : getAttribCheck(key, value);
  60. });
  61. return funcs.length === 0 ? null : funcs.reduce(combineFuncs);
  62. }
  63. /**
  64. * @param options An object describing nodes to look for.
  65. * @param node The element to test.
  66. * @returns Whether the element matches the description in `options`.
  67. */
  68. function testElement(options, node) {
  69. var test = compileTest(options);
  70. return test ? test(node) : true;
  71. }
  72. exports.testElement = testElement;
  73. /**
  74. * @param options An object describing nodes to look for.
  75. * @param nodes Nodes to search through.
  76. * @param recurse Also consider child nodes.
  77. * @param limit Maximum number of nodes to return.
  78. * @returns All nodes that match `options`.
  79. */
  80. function getElements(options, nodes, recurse, limit) {
  81. if (limit === void 0) { limit = Infinity; }
  82. var test = compileTest(options);
  83. return test ? (0, querying_1.filter)(test, nodes, recurse, limit) : [];
  84. }
  85. exports.getElements = getElements;
  86. /**
  87. * @param id The unique ID attribute value to look for.
  88. * @param nodes Nodes to search through.
  89. * @param recurse Also consider child nodes.
  90. * @returns The node with the supplied ID.
  91. */
  92. function getElementById(id, nodes, recurse) {
  93. if (recurse === void 0) { recurse = true; }
  94. if (!Array.isArray(nodes))
  95. nodes = [nodes];
  96. return (0, querying_1.findOne)(getAttribCheck("id", id), nodes, recurse);
  97. }
  98. exports.getElementById = getElementById;
  99. /**
  100. * @param tagName Tag name to search for.
  101. * @param nodes Nodes to search through.
  102. * @param recurse Also consider child nodes.
  103. * @param limit Maximum number of nodes to return.
  104. * @returns All nodes with the supplied `tagName`.
  105. */
  106. function getElementsByTagName(tagName, nodes, recurse, limit) {
  107. if (recurse === void 0) { recurse = true; }
  108. if (limit === void 0) { limit = Infinity; }
  109. return (0, querying_1.filter)(Checks.tag_name(tagName), nodes, recurse, limit);
  110. }
  111. exports.getElementsByTagName = getElementsByTagName;
  112. /**
  113. * @param type Element type to look for.
  114. * @param nodes Nodes to search through.
  115. * @param recurse Also consider child nodes.
  116. * @param limit Maximum number of nodes to return.
  117. * @returns All nodes with the supplied `type`.
  118. */
  119. function getElementsByTagType(type, nodes, recurse, limit) {
  120. if (recurse === void 0) { recurse = true; }
  121. if (limit === void 0) { limit = Infinity; }
  122. return (0, querying_1.filter)(Checks.tag_type(type), nodes, recurse, limit);
  123. }
  124. exports.getElementsByTagType = getElementsByTagType;