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Allows for flexible transformations useful for eg. processing rich text editor output for email.\n\n### Features\n- Strip tags or nodes\n- Replace nodes with string(s) or a function\n- Reduce child nodes for adding/removing/modifying sibling nodes\n- Utility functions to simplify creating nodes, adding and checking for attributes\n\n## Install\n```\nnpm install --save html-ast-transform parse5\n```\n\n## Usage\n\n```js\nimport {transform, h, getAttr, hasClass} from 'html-ast-transform'\n// or es5:\nvar transform = require('html-ast-transform').transform\n// umd:\nconst {transform, h, hasClass, getAttr} = HtmlAstTransform\n\n\nconst result = transform(html, options)\n```\n\n## Examples\n### Replace paragraph tags with table rows\n```js\nconst input = '\u003cdiv\u003e\u003cp class=\"text-center\"\u003eSome text\u003c/p\u003e\u003c/div\u003e'\n\nconst output = transform(input, {\n  replaceTags: {\n    p: node =\u003e h('tr', [], [\n      h('td', node.attrs, node.childNodes)\n    ])\n  }\n})\n\n// output = '\u003cdiv\u003e\u003ctr\u003e\u003ctd class=\"text-center\"\u003eSome text\u003c/td\u003e\u003c/tr\u003e\u003c/div\u003e'\n```\n\n### Generate plain text version retaining links and image alt text\n```js\nconst input = '\u003cp\u003eText with \u003ca href=\"example.com\"\u003ea link\u003c/a\u003e\u003cimg alt=\"and an image\" /\u003e\u003c/p\u003e'\n\nconst stringifyLinks = (acc, node) =\u003e {\n  if (node.nodeName !== 'a') return acc.concat(node)\n\n  const href = getAttr(node, 'href')\n  return acc.concat(\n    node.childNodes,\n    h('#text', ` [${href}]`)\n  )\n}\n\nconst getAltText = node =\u003e {\n  const alt = getAttr(node, 'alt')\n  return h('#text', alt ? ` [${alt}]` : '')\n}\n\nconst output = transform(input, {\n  replaceTags: {\n    p: '\\n',\n    img: getAltText\n  },\n  reduceAll: stringifyLinks\n})\n\n// output = '\\nText with a link [example.com] [and an image]'\n```\n\n## API\n### transform\n```ts\ntransform(input: string, {\n  replaceTags?: {\n    [tagName: string]: string | string[] | (node: Element) =\u003e Node\n  },\n  reduceAll?: (acc: Node[], node: Element, index: number, nodes: Node[]) =\u003e Node[],\n  stripContent?: string[],\n  stripTags?: string[],\n  trimWhitespace?: boolean,\n  fragment?: boolean\n})\n```\n\n**replaceTags**: A mapping of tag names to their replacements. Replacements can be a string that will replace the opening tag, an array of strings that will replace opening and closing tags or a function that receives the node and returns a replacement node.\n\n**reduceAll**: A reducer to run over the children of all nodes. Receives the accumulated childNodes, the current childNode, the current index and the list of childNodes.\n\n**stripContent**: An array of tag names that will be removed along with their contents\n\n**stripTags** An array of tag names to be removed while retaining their contents\n\n**trimWhitespace**: Handle indentation and newlines by removing whitespace only text nodes and trimming text nodes with multiple leading/trailing whitespace to a single space. *default = true*\n\n**fragment**: Parse the input as an html fragment rather than a full document. *default = true*\n\n### Helpers\n#### node factory\n```ts\nh(html: string): Node\n\nh(type: string, value: string): TextNode | CommentNode\n\nh(\n  tagName: string,\n  attrs: Attribute[],\n  childNodes: Node[]\n): Element\n```\n#### attribute helpers\n```ts\n// get the value of the named attribute, if present\ngetAttr(node: Element, name: string): string | undefined\n\n// add an attribute to an element or update if it already exists\nwithAttr(node: Element, name: string, value: string): Element\n\n// check if the element has a class\nhasClass(node: Element, name: string): boolean\n\n// add a class to an element if not already present\nwithClass(node: Element, name: string): Element\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjspaine%2Fhtml-ast-transform","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjspaine%2Fhtml-ast-transform","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjspaine%2Fhtml-ast-transform/lists"}