'use strict';
|
|
var svgReg = /<svg[^>]+[^>]*>/;
|
function isSVG (buffer) {
|
return svgReg.test(buffer);
|
}
|
|
var extractorRegExps = {
|
'root': /<svg\s[^>]+>/,
|
'width': /\bwidth=(['"])([^%]+?)\1/,
|
'height': /\bheight=(['"])([^%]+?)\1/,
|
'viewbox': /\bviewBox=(['"])(.+?)\1/
|
};
|
|
function parseViewbox (viewbox) {
|
var bounds = viewbox.split(' ');
|
return {
|
'width': parseInt(bounds[2], 10),
|
'height': parseInt(bounds[3], 10)
|
};
|
}
|
|
function parseAttributes (root) {
|
var width = root.match(extractorRegExps.width);
|
var height = root.match(extractorRegExps.height);
|
var viewbox = root.match(extractorRegExps.viewbox);
|
return {
|
'width': width && parseInt(width[2], 10),
|
'height': height && parseInt(height[2], 10),
|
'viewbox': viewbox && parseViewbox(viewbox[2])
|
};
|
}
|
|
function calculateByDimensions (attrs) {
|
return {
|
'width': attrs.width,
|
'height': attrs.height
|
};
|
}
|
|
function calculateByViewbox (attrs) {
|
var ratio = attrs.viewbox.width / attrs.viewbox.height;
|
if (attrs.width) {
|
return {
|
'width': attrs.width,
|
'height': Math.floor(attrs.width / ratio)
|
};
|
}
|
if (attrs.height) {
|
return {
|
'width': Math.floor(attrs.height * ratio),
|
'height': attrs.height
|
};
|
}
|
return {
|
'width': attrs.viewbox.width,
|
'height': attrs.viewbox.height
|
};
|
}
|
|
function calculate (buffer) {
|
var root = buffer.toString('utf8').match(extractorRegExps.root);
|
if (root) {
|
var attrs = parseAttributes(root[0]);
|
if (attrs.width && attrs.height) {
|
return calculateByDimensions(attrs);
|
}
|
if (attrs.viewbox) {
|
return calculateByViewbox(attrs);
|
}
|
}
|
throw new TypeError('invalid svg');
|
}
|
|
module.exports = {
|
'detect': isSVG,
|
'calculate': calculate
|
};
|
