mirror of https://github.com/jkjoy/sunpeiwen.git
33 lines
823 B
JavaScript
33 lines
823 B
JavaScript
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var utils = require('../utils')
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, nodes = require('../nodes');
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/**
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* Return the opposites of the given `positions`.
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*
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* Examples:
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*
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* opposite-position(top left)
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* // => bottom right
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*
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* @param {Expression} positions
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* @return {Expression}
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* @api public
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*/
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(module.exports = function oppositePosition(positions){
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var expr = [];
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utils.unwrap(positions).nodes.forEach(function(pos, i){
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utils.assertString(pos, 'position ' + i);
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pos = (function(){ switch (pos.string) {
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case 'top': return 'bottom';
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case 'bottom': return 'top';
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case 'left': return 'right';
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case 'right': return 'left';
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case 'center': return 'center';
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default: throw new Error('invalid position ' + pos);
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}})();
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expr.push(new nodes.Literal(pos));
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});
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return expr;
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}).raw = true;
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