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'use strict';
var Matrix = require('./matrix');
var operations = {
matrix: true,
scale: true,
rotate: true,
translate: true,
skewX: true,
skewY: true
};
var CMD_SPLIT_RE = /\s*(matrix|translate|scale|rotate|skewX|skewY)\s*\(\s*(.+?)\s*\)[\s,]*/;
var PARAMS_SPLIT_RE = /[\s,]+/;
module.exports = function transformParse(transformString) {
var matrix = new Matrix();
var cmd, params;
// Split value into ['', 'translate', '10 50', '', 'scale', '2', '', 'rotate', '-45', '']
transformString.split(CMD_SPLIT_RE).forEach(function (item) {
// Skip empty elements
if (!item.length) { return; }
// remember operation
if (typeof operations[item] !== 'undefined') {
cmd = item;
return;
}
// extract params & att operation to matrix
params = item.split(PARAMS_SPLIT_RE).map(function (i) {
return +i || 0;
});
// If params count is not correct - ignore command
switch (cmd) {
case 'matrix':
if (params.length === 6) {
matrix.matrix(params);
}
return;
case 'scale':
if (params.length === 1) {
matrix.scale(params[0], params[0]);
} else if (params.length === 2) {
matrix.scale(params[0], params[1]);
}
return;
case 'rotate':
if (params.length === 1) {
matrix.rotate(params[0], 0, 0);
} else if (params.length === 3) {
matrix.rotate(params[0], params[1], params[2]);
}
return;
case 'translate':
if (params.length === 1) {
matrix.translate(params[0], 0);
} else if (params.length === 2) {
matrix.translate(params[0], params[1]);
}
return;
case 'skewX':
if (params.length === 1) {
matrix.skewX(params[0]);
}
return;
case 'skewY':
if (params.length === 1) {
matrix.skewY(params[0]);
}
return;
}
});
return matrix;
};