pdfmake/js/SVGMeasure.js

Client/server side PDF printing in pure JavaScript

"use strict";

exports.__esModule = true;
exports.default = void 0;
var _xmldoc = require("xmldoc");
var _variableType = require("./helpers/variableType");
/**
 * Strip unit postfix, parse number, but return undefined instead of NaN for bad input
 *
 * @param {string} textVal
 * @returns {?number}
 */
const stripUnits = textVal => {
  let n = parseFloat(textVal);
  if (typeof n !== 'number' || isNaN(n)) {
    return undefined;
  }
  return n;
};

/**
 * Make sure it's valid XML and the root tag is <svg/>, returns xmldoc DOM
 *
 * @param {string} svgString
 * @returns {object}
 */
const parseSVG = svgString => {
  let doc;
  try {
    doc = new _xmldoc.XmlDocument(svgString);
  } catch (err) {
    throw new Error('Invalid svg document (' + err + ')');
  }
  if (doc.name !== "svg") {
    throw new Error('Invalid svg document (expected <svg>)');
  }
  return doc;
};
class SVGMeasure {
  constructor() {}
  measureSVG(svg) {
    let width, height, viewBox;
    if ((0, _variableType.isString)(svg)) {
      let doc = parseSVG(svg);
      width = doc.attr.width;
      height = doc.attr.height;
      viewBox = doc.attr.viewBox;
    } else if (typeof SVGElement !== 'undefined' && svg instanceof SVGElement && typeof getComputedStyle === 'function') {
      width = svg.getAttribute("width");
      height = svg.getAttribute("height");
      viewBox = svg.getAttribute("viewBox");
    } else {
      throw new Error('Invalid SVG document');
    }
    let docWidth = stripUnits(width);
    let docHeight = stripUnits(height);
    if ((docWidth === undefined || docHeight === undefined) && typeof viewBox === 'string') {
      let viewBoxParts = viewBox.split(/[,\s]+/);
      if (viewBoxParts.length !== 4) {
        throw new Error("Unexpected svg viewBox format, should have 4 entries but found: '" + viewBox + "'");
      }
      if (docWidth === undefined) {
        docWidth = stripUnits(viewBoxParts[2]);
      }
      if (docHeight === undefined) {
        docHeight = stripUnits(viewBoxParts[3]);
      }
    }
    return {
      width: docWidth,
      height: docHeight
    };
  }
  writeDimensions(svg, dimensions) {
    if ((0, _variableType.isString)(svg)) {
      let doc = parseSVG(svg);
      if (typeof doc.attr.viewBox !== 'string') {
        doc.attr.viewBox = `0 0 ${stripUnits(doc.attr.width)} ${stripUnits(doc.attr.height)}`;
      }
      doc.attr.width = "" + dimensions.width;
      doc.attr.height = "" + dimensions.height;
      return doc.toString();
    }
    if (!svg.hasAttribute('viewBox')) {
      svg.setAttribute('viewBox', `0 0 ${stripUnits(svg.getAttribute('width'))} ${stripUnits(svg.getAttribute('height'))}`);
    }
    svg.setAttribute('width', "" + dimensions.width);
    svg.setAttribute('height', "" + dimensions.height);
    return svg;
  }
}
var _default = exports.default = SVGMeasure;