46 lines
1.1 KiB
JavaScript
46 lines
1.1 KiB
JavaScript
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'use strict';
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const OMIT_PLUSSIGN = /^(?:\+|(-))?0*(\d*)(?:\.0*|(\.\d*?)0*)?$/;
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const KEEP_PLUSSIGN = /^([\+\-])?0*(\d*)(?:\.0*|(\.\d*?)0*)?$/;
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const unsafeToRemovePlusSignAfter = new Set([
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'Dimension',
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'Hash',
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'Identifier',
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'Number',
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'Raw',
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'UnicodeRange'
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]);
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function packNumber(value, item) {
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// omit plus sign only if no prev or prev is safe type
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const regexp = item && item.prev !== null && unsafeToRemovePlusSignAfter.has(item.prev.data.type)
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? KEEP_PLUSSIGN
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: OMIT_PLUSSIGN;
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// 100 -> '100'
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// 00100 -> '100'
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// +100 -> '100'
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// -100 -> '-100'
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// 0.123 -> '.123'
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// 0.12300 -> '.123'
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// 0.0 -> ''
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// 0 -> ''
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// -0 -> '-'
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value = String(value).replace(regexp, '$1$2$3');
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if (value === '' || value === '-') {
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value = '0';
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}
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// FIXME: is it solution simplier?
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// value = String(Number(value)).replace(/^(-?)0+\./, '$1.');
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return value;
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}
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function Number(node) {
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node.value = packNumber(node.value);
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}
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exports.Number = Number;
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exports.packNumber = packNumber;
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