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//import { create, all } from 'mathjs/number';
//const math = create(all);
//import * as math from 'mathjs';
import * as math from 'mathjs/number';
const processExpressionTerm = (term, parameters) => {
const expression = term
.replace(/{/g, '')
.replace(/\(/g, '')
.replace(/\)/g, '')
.replace(/}/g, '')
.replace(/\+/g, ' ')
.replace(/-/g, ' ')
.replace(/\^/g, ' ')
.replace(/\//g, ' ')
.replace(/\*/g, ' ')
.replace(/,/g, ' ')
.replace(/'/g, ' ');
const terms = expression.split(" ");
for (let term in terms) {
if (!terms[term] || !isNaN(terms[term])) {
continue;
}
Eif (!parameters[terms[term]]) {
parameters[terms[term]] = 0;
}
}
return parameters;
}
const getParameters = (attributes, parameters) => {
// Given a NamedNodeMap or Array of attributes for a tag, identify any parameters not recorded in the parameters array
if (!attributes) {
return;
}
// process only the contents of {}
const re = /\{(.+?)\}/g;
for (let j = 0; j < attributes.length; j++) {
const attribute = attributes[j];
if (attribute.name.startsWith("parametric:")) {
attribute.nodeValue.replace(re, (match, g1, g2) => {
parameters = processExpressionTerm(g1, parameters);
});
}
}
};
const getDefaultParamValues = (svg, defaultParameters) => {
const defaultAttribute = svg.attributes["parametric:defaults"];
if (defaultAttribute) {
let assignments = defaultAttribute.nodeValue.split(";");
let param, value;
for (let i in assignments) {
[param, value] = assignments[i].split("=");
param = param.trim();
defaultParameters[param] = value;
}
}
return defaultParameters;
}
const getTree = (parentNode) => {
const childrenArray = [].slice.call(parentNode.children)
const children = childrenArray.map(child => getTree(child));
return {
tagName: parentNode.tagName,
id: parentNode.id,
className: parentNode.className,
attributes: [...parentNode.attributes].map(d =>
({name: d.name, value: d.value})),
children: children
};
}
// This is the intended entrypoint for the parametric SVG editor
const parseParametricSVG = (svgString) => {
var virtualParent = document.createElement('div'); // can't set outerHTML of an element with no parent
var virtualSVG = document.createElement('svg');
virtualSVG.id = 'VIRTUAL-SVG';
virtualParent.appendChild(virtualSVG);
if (svgString.includes("<svg")) {
virtualSVG.outerHTML = svgString;
} else {
virtualSVG.innerHTML = svgString;
}
virtualSVG = virtualParent.lastChild;
let parameters = {};
let defaultParameters = {};
let children = virtualSVG.childNodes;
for (let i = 0; i < children.length; i++) {
getParameters(children[i].attributes, parameters);
}
defaultParameters = getDefaultParamValues(virtualSVG, defaultParameters);
// Construct tree in JSON reflecting tree in SVG
const tree = getTree(virtualSVG);
return {parameters, defaultParameters, tree};
}
///
const re = /\{(.+?)\}/g;
const Element = ({tree, params, defaultParams}) => {
var attributes = {};
const attribute_names = tree.attributes.map(d => d.name);
const camelCase = (name) => (
name.split('-')
.map((item, index) => index ? item.charAt(0).toUpperCase() + item.slice(1).toLowerCase() : item)
.join("")
);
for (let i in tree.attributes) {
let name = tree.attributes[i].name;
let value = tree.attributes[i].value;
if (name && name.startsWith("parametric:")) {
attributes[name] = value; // save the parametric version
value = value.replace(re, function (match, g1, g2) {
try {
return math.evaluate(g1, params)
} catch (err) {
return null;
}
});
attributes[camelCase(name.replace('parametric:', ''))] = value; // save version with paramater values substituted
} else Eif (!attribute_names.includes('parametric:' + name)) {
attributes[camelCase(name)] = value;
} else {
// this is the non-parametric version of an attribute: don't replace value substituted above
}
}
const childTags = tree.children.map( (child, i) => <Element tree={child} params={params} defaultParams={defaultParams} key={i} />);
return React.createElement(tree.tagName, attributes, childTags);
};
const PreviewSVG = ({params, defaultParams, tree, updateSVGString}) => {
useEffect(() => {if (updateSVGString){ updateSVGString()}});
return <Element tree={tree} params={params} defaultParams={defaultParams}/>;
};
// This is the entrypoint if you just want to render a parametric SVG
const ParametricSVG = ({svgString, params, onParse, innerOnly}) => {
const {parameters, defaultParameters: defaultParams, tree} = parseParametricSVG(svgString);
Iif (onParse){
onParse(parameters, defaultParams);
}
if (innerOnly){
return <>{tree.children.map( (child, i) => <Element tree={child} params={{...defaultParams, ...(params || {})}} defaultParams={defaultParams} key={i} />)}</>
} else {
return <Element tree={tree} params={{...defaultParams, ...(params || {})}} defaultParams={defaultParams}/>;
}
}
export {ParametricSVG, parseParametricSVG, PreviewSVG};
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