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'use strict';
var EOL = require('os').EOL,
textElems = require('../../plugins/_collections.js').textElems;
var defaults = {
doctypeStart: '<!DOCTYPE',
doctypeEnd: '>',
procInstStart: '<?',
procInstEnd: '?>',
tagOpenStart: '<',
tagOpenEnd: '>',
tagCloseStart: '</',
tagCloseEnd: '>',
tagShortStart: '<',
tagShortEnd: '/>',
attrStart: '="',
attrEnd: '"',
commentStart: '<!--',
commentEnd: '-->',
cdataStart: '<![CDATA[',
cdataEnd: ']]>',
textStart: '',
textEnd: '',
indent: 4,
regEntities: /[&'"<>]/g,
regValEntities: /[&"<>]/g,
encodeEntity: encodeEntity,
pretty: false,
useShortTags: true,
};
var entities = {
'&': '&',
"'": ''',
'"': '"',
'>': '>',
'<': '<',
};
/**
* Convert SVG-as-JS object to SVG (XML) string.
*
* @param {Object} data input data
* @param {Object} config config
*
* @return {Object} output data
*/
module.exports = function (data, config) {
return new JS2SVG(config).convert(data);
};
function JS2SVG(config) {
if (config) {
this.config = Object.assign({}, defaults, config);
} else {
this.config = Object.assign({}, defaults);
}
var indent = this.config.indent;
if (typeof indent == 'number' && !isNaN(indent)) {
this.config.indent = indent < 0 ? '\t' : ' '.repeat(indent);
} else if (typeof indent != 'string') {
this.config.indent = ' ';
}
if (this.config.pretty) {
this.config.doctypeEnd += EOL;
this.config.procInstEnd += EOL;
this.config.commentEnd += EOL;
this.config.cdataEnd += EOL;
this.config.tagShortEnd += EOL;
this.config.tagOpenEnd += EOL;
this.config.tagCloseEnd += EOL;
this.config.textEnd += EOL;
}
this.indentLevel = 0;
this.textContext = null;
}
function encodeEntity(char) {
return entities[char];
}
/**
* Start conversion.
*
* @param {Object} data input data
*
* @return {String}
*/
JS2SVG.prototype.convert = function (data) {
var svg = '';
this.indentLevel++;
for (const item of data.children) {
if (item.type === 'element') {
svg += this.createElem(item);
}
if (item.type === 'text') {
svg += this.createText(item);
}
if (item.type === 'doctype') {
svg += this.createDoctype(item);
}
if (item.type === 'instruction') {
svg += this.createProcInst(item);
}
if (item.type === 'comment') {
svg += this.createComment(item);
}
if (item.type === 'cdata') {
svg += this.createCDATA(item);
}
}
this.indentLevel--;
return {
data: svg,
info: {
width: this.width,
height: this.height,
},
};
};
/**
* Create indent string in accordance with the current node level.
*
* @return {String}
*/
JS2SVG.prototype.createIndent = function () {
var indent = '';
if (this.config.pretty && !this.textContext) {
indent = this.config.indent.repeat(this.indentLevel - 1);
}
return indent;
};
/**
* Create doctype tag.
*
* @param {String} doctype doctype body string
*
* @return {String}
*/
JS2SVG.prototype.createDoctype = function (node) {
const { doctype } = node.data;
return this.config.doctypeStart + doctype + this.config.doctypeEnd;
};
/**
* Create XML Processing Instruction tag.
*
* @param {Object} instruction instruction object
*
* @return {String}
*/
JS2SVG.prototype.createProcInst = function (node) {
const { name, value } = node;
return (
this.config.procInstStart + name + ' ' + value + this.config.procInstEnd
);
};
/**
* Create comment tag.
*
* @param {String} comment comment body
*
* @return {String}
*/
JS2SVG.prototype.createComment = function (node) {
const { value } = node;
return this.config.commentStart + value + this.config.commentEnd;
};
/**
* Create CDATA section.
*
* @param {String} cdata CDATA body
*
* @return {String}
*/
JS2SVG.prototype.createCDATA = function (node) {
const { value } = node;
return (
this.createIndent() + this.config.cdataStart + value + this.config.cdataEnd
);
};
/**
* Create element tag.
*
* @param {Object} data element object
*
* @return {String}
*/
JS2SVG.prototype.createElem = function (data) {
// beautiful injection for obtaining SVG information :)
if (
data.name === 'svg' &&
data.attributes.width != null &&
data.attributes.height != null
) {
this.width = data.attributes.width;
this.height = data.attributes.height;
}
// empty element and short tag
if (data.children.length === 0) {
if (this.config.useShortTags) {
return (
this.createIndent() +
this.config.tagShortStart +
data.name +
this.createAttrs(data) +
this.config.tagShortEnd
);
} else {
return (
this.createIndent() +
this.config.tagShortStart +
data.name +
this.createAttrs(data) +
this.config.tagOpenEnd +
this.config.tagCloseStart +
data.name +
this.config.tagCloseEnd
);
}
// non-empty element
} else {
var tagOpenStart = this.config.tagOpenStart,
tagOpenEnd = this.config.tagOpenEnd,
tagCloseStart = this.config.tagCloseStart,
tagCloseEnd = this.config.tagCloseEnd,
openIndent = this.createIndent(),
closeIndent = this.createIndent(),
processedData = '',
dataEnd = '';
if (this.textContext) {
tagOpenStart = defaults.tagOpenStart;
tagOpenEnd = defaults.tagOpenEnd;
tagCloseStart = defaults.tagCloseStart;
tagCloseEnd = defaults.tagCloseEnd;
openIndent = '';
} else if (data.isElem(textElems)) {
tagOpenEnd = defaults.tagOpenEnd;
tagCloseStart = defaults.tagCloseStart;
closeIndent = '';
this.textContext = data;
}
processedData += this.convert(data).data;
if (this.textContext == data) {
this.textContext = null;
}
return (
openIndent +
tagOpenStart +
data.name +
this.createAttrs(data) +
tagOpenEnd +
processedData +
dataEnd +
closeIndent +
tagCloseStart +
data.name +
tagCloseEnd
);
}
};
/**
* Create element attributes.
*
* @param {Object} elem attributes object
*
* @return {String}
*/
JS2SVG.prototype.createAttrs = function (element) {
let attrs = '';
for (const [name, value] of Object.entries(element.attributes)) {
if (value !== undefined) {
const encodedValue = value
.toString()
.replace(this.config.regValEntities, this.config.encodeEntity);
attrs +=
' ' + name + this.config.attrStart + encodedValue + this.config.attrEnd;
} else {
attrs += ' ' + name;
}
}
return attrs;
};
/**
* Create text node.
*
* @param {String} text text
*
* @return {String}
*/
JS2SVG.prototype.createText = function (node) {
const { value } = node;
return (
this.createIndent() +
this.config.textStart +
value.replace(this.config.regEntities, this.config.encodeEntity) +
(this.textContext ? '' : this.config.textEnd)
);
};