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March 18, 2021 21:21
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Parse HTML string into React Elements
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import React from "react"; | |
import { htmlFragmentToReact } from "./html-to-element"; | |
import { allowTag, parserModify } from "./html-post-parse-fns"; | |
export default function Component(props) { | |
return <div className="component-example"> | |
{htmlFragmentToReact(postNode.html, null, React.createElement, allowTag, parserModify)} | |
</div>; | |
} |
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import { Fragment } from "react"; | |
export function allowTextNotInTable (el, elAdapter, parents) { | |
const lastParent = parents.slice(-1)[0]; | |
const pname = lastParent && elAdapter.nameGet(lastParent); | |
switch (pname) { | |
case 'table': | |
case 'tbody': | |
case 'thead': | |
case 'tr': | |
return; | |
default: | |
return el; | |
} | |
} | |
export function allowTagBasic (el, elAdapter, parents) { | |
if (elAdapter.isFragment(el)) return Fragment; | |
if (elAdapter.isText(el)) return allowTextNotInTable (el, elAdapter, parents); | |
const name = elAdapter.nameGet(el); | |
switch (name) { | |
case 'hr': | |
this.allowChildren(false); | |
break; | |
} | |
switch (name) { | |
case 'br': | |
case 'del': | |
case 'em': | |
case 'h1': | |
case 'h2': | |
case 'h3': | |
case 'h4': | |
case 'h5': | |
case 'h6': | |
case 'p': | |
case 'span': | |
case 'strong': | |
return name; | |
default: | |
console.warn(name, `parse html ignorou tag "${name}"`, el); | |
} | |
} | |
export function allowTag (el, elAdapter, parents) { | |
if (elAdapter.isFragment(el)) return Fragment; | |
if (elAdapter.isText(el)) return allowTextNotInTable (el, elAdapter, parents); | |
const name = elAdapter.nameGet(el); | |
switch (name) { | |
case 'hr': | |
this.allowChildren(false); | |
break; | |
} | |
switch (name) { | |
case 'a': | |
case 'blockquote': | |
case 'br': | |
case 'code': | |
case 'dd': | |
case 'del': | |
case 'div': | |
case 'dl': | |
case 'dt': | |
case 'em': | |
case 'h1': | |
case 'h2': | |
case 'h3': | |
case 'h4': | |
case 'h5': | |
case 'h6': | |
case 'hr': | |
case 'img': | |
case 'li': | |
case 'ol': | |
case 'p': | |
case 'path': | |
case 'pre': | |
case 'span': | |
case 'strong': | |
case 'svg': | |
case 'table': | |
case 'tbody': | |
case 'td': | |
case 'th': | |
case 'thead': | |
case 'tr': | |
case 'ul': | |
return name; | |
default: | |
console.warn(name, `parse html ignorou tag "${name}"`, el); | |
} | |
} | |
const reClass = /^class$/i; | |
const reStyle = /^style$/i; | |
const reFillRule = /^fill-rule$/i; | |
export function parserModify(ev) { | |
switch (ev.name) { | |
case 'tagAttribute': | |
const {attr, tag} = ev; | |
const {name: attrName} = attr; | |
if (reStyle.test(attrName)) { | |
if ('position:relative;' !== attr.value) { | |
console.warn(`html com style`, attr, tag, ev); | |
} | |
return; | |
} else if (reClass.test(attrName)) { | |
// console.warn(`Page templates/post: html com class`, attr, tag, ev); | |
attr.name = 'className'; | |
} else if (reFillRule.test(attrName)) { | |
// console.warn(`Page templates/post: html com class`, attr, tag, ev); | |
attr.name = 'fillRule'; | |
} | |
break; | |
} | |
return ev; | |
} |
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import XMLParser from "@arijs/stream-xml-parser/src/xmlparser"; | |
import TreeBuilder from "@arijs/stream-xml-parser/src/treebuilder"; | |
import htmlVoidTagMap from "@arijs/stream-xml-parser/src/htmlvoidtagmap"; | |
// import reactAdapter from "./element-adapter-react"; | |
import elDefault from "@arijs/stream-xml-parser/src/element/default"; | |
export default function htmlToElement(html, evModify = x => x) { | |
const elAdapter = elDefault(); | |
const tb = new TreeBuilder({ | |
element: elAdapter, | |
tagVoidMap: htmlVoidTagMap, | |
}); | |
const xp = new XMLParser((ev) => (ev = evModify(ev)) && tb.parserEvent(ev)); | |
xp.end(html); | |
const root = tb.root.tag; | |
// const children = elAdapter.childrenGet(root); | |
// const toReact = list => list.flatMap(el => elToReact(el, elAdapter, createElement, allowTag)) | |
return { root, elAdapter, tb, xp }; | |
} | |
export function htmlFragmentToReact(html, meta, createElement, allowTag, evModify) { | |
const {root, elAdapter} = htmlToElement(html, evModify); | |
return elToReact(root, elAdapter, meta, createElement, allowTag); | |
} | |
export function htmlChildrenToReact(html, meta, createElement, allowTag, evModify) { | |
const {root, elAdapter} = htmlToElement(html, evModify); | |
return listToReact(elAdapter.childrenGet(root), elAdapter, meta, createElement, allowTag, [root]); | |
} | |
export function listToReact(list, elAdapter, meta, createElement, allowTag, parents) { | |
return list.flatMap(el => elToReact(el, elAdapter, meta, createElement, allowTag, parents)); | |
} | |
export function elToReact(el, elAdapter, meta, createElement, allowTag, parents = []) { | |
let allowChildren = true; | |
const fnCtx = { | |
allowChildren: v => allowChildren = v, | |
}; | |
if ( | |
// elAdapter.isFragment(el) || | |
elAdapter.isComment(el) || | |
elAdapter.isDeclaration(el) || | |
elAdapter.isInstruction(el) | |
) { | |
return []; | |
} | |
if ( | |
elAdapter.isText(el) | |
) { | |
const elText = allowTag.call(fnCtx, el, elAdapter, parents); | |
return elText ? [elAdapter.textValueGet(elText)] : []; | |
} | |
// elAdapter.isFragment(el) ? Fragment : | |
const type = allowTag.call(fnCtx, el, elAdapter, parents); | |
if (!type) return []; | |
let children = allowChildren | |
? listToReact(elAdapter.childrenGet(el), elAdapter, meta, createElement, allowTag, parents.concat(el)) | |
: []; | |
// if (children.length === 1) children = children[0]; | |
const props = {...meta}; | |
elAdapter.attrsEach(el, (name, value) => { | |
switch (name) { | |
case 'key': | |
case 'ref': | |
case 'children': | |
console.warn(`Element/React: Ignored property "${name}" on`, el); | |
return; | |
default: props[name] = value; | |
} | |
}); | |
return createElement(type, props, ...children); | |
} |
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