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'use strict';
const SAX = require('@trysound/sax');
const JSAPI = require('./jsAPI.js');
const { textElems } = require('../../plugins/_collections.js');
const entityDeclaration = /<!ENTITY\s+(\S+)\s+(?:'([^']+)'|"([^"]+)")\s*>/g;
const config = {
strict: true,
trim: false,
normalize: false,
lowercase: true,
xmlns: true,
position: true,
};
/**
* Convert SVG (XML) string to SVG-as-JS object.
*
* @param {String} data input data
*/
module.exports = function (data) {
const sax = SAX.parser(config.strict, config);
const root = new JSAPI({ type: 'root', children: [] });
let current = root;
let stack = [root];
function pushToContent(node) {
const wrapped = new JSAPI(node, current);
current.children.push(wrapped);
return wrapped;
}
sax.ondoctype = function (doctype) {
pushToContent({
type: 'doctype',
// TODO parse doctype for name, public and system to match xast
name: 'svg',
data: {
doctype,
},
});
const subsetStart = doctype.indexOf('[');
let entityMatch;
if (subsetStart >= 0) {
entityDeclaration.lastIndex = subsetStart;
while ((entityMatch = entityDeclaration.exec(data)) != null) {
sax.ENTITIES[entityMatch[1]] = entityMatch[2] || entityMatch[3];
}
}
};
sax.onprocessinginstruction = function (data) {
pushToContent({
type: 'instruction',
name: data.name,
value: data.body,
});
};
sax.oncomment = function (comment) {
pushToContent({
type: 'comment',
value: comment.trim(),
});
};
sax.oncdata = function (cdata) {
pushToContent({
type: 'cdata',
value: cdata,
});
};
sax.onopentag = function (data) {
var element = {
type: 'element',
name: data.name,
attributes: {},
children: [],
};
for (const [name, attr] of Object.entries(data.attributes)) {
element.attributes[name] = attr.value;
}
element = pushToContent(element);
current = element;
stack.push(element);
};
sax.ontext = function (text) {
// prevent trimming of meaningful whitespace inside textual tags
if (textElems.includes(current.name) && !data.prefix) {
pushToContent({
type: 'text',
value: text,
});
} else if (/\S/.test(text)) {
pushToContent({
type: 'text',
value: text.trim(),
});
}
};
sax.onclosetag = function () {
stack.pop();
current = stack[stack.length - 1];
};
sax.onerror = function (e) {
e.message = 'Error in parsing SVG: ' + e.message;
if (e.message.indexOf('Unexpected end') < 0) {
throw e;
}
};
try {
sax.write(data).close();
return root;
} catch (e) {
return { error: e.message };
}
};