A CSS post-processor that converts px to viewport units (vw, vh, vmin, vmax). 

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postcss-px-to-viewport

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var objectAssign = require('object-assign');

// excluding regex trick: http://www.rexegg.com/regex-best-trick.html

// !singlequotes|!doublequotes|!url()|pixelunit

var pxRegex = /"[^"]+"|'[^']+'|url\([^\)]+\)|(\d*\.?\d+)px/ig;

  //propWhiteList: ['font', 'font-size', 'line-height', 'letter-spacing'],

module.exports = postcss.plugin('postcss-px-to-viewport', function (options) {

  var opts = objectAssign({}, defaults, options);

  var pxReplace = createPxReplace(opts.viewportWidth, opts.unitPrecision, opts.viewportUnit);

  var pxReplace = createPxReplace(opts.viewportWidth, opts.minPixelValue, opts.unitPrecision, opts.viewportUnit);

      // This should be the fastest test and will remove most declarations

      if (decl.value.indexOf('px') === -1) return;

      // if (opts.propWhiteList.length && opts.propWhiteList.indexOf(decl.prop) === -1) return;

      if (blacklistedSelector(opts.selectorBlackList, decl.parent.selector)) return;

      //var value = decl.value.replace(pxRegex, pxReplace);

      ////// if viewport unit already exists, do not replace

      ////if (declarationExists(decl.parent, decl.prop, value)) return;

      decl.value = decl.value.replace(pxRegex, pxReplace);

      css.walkAtRules('media', function (rule) {

        if (rule.params.indexOf('px') === -1) return;

        rule.params = rule.params.replace(pxRegex, pxReplace);

function createPxReplace(viewportSize, unitPrecision, viewportUnit) {

function createPxReplace(viewportSize, minPixelValue, unitPrecision, viewportUnit) {

    if (pixels <= minPixelValue) return m;

    return toFixed((pixels / viewportSize * 100), unitPrecision) + viewportUnit;

  var multiplier = Math.pow(10, precision + 1),

    wholeNumber = Math.floor(number * multiplier);

  return Math.round(wholeNumber / 10) * 10 / multiplier;

//function declarationExists(decls, prop, value) {

//    return decls.some(function (decl) {

//        return (decl.prop === prop && decl.value === value);

function blacklistedSelector(blacklist, selector) {

  if (typeof selector !== 'string') return;

  return blacklist.some(function (regex) {

    if (typeof regex === 'string') return selector.indexOf(regex) !== -1;

  "description": "A CSS post-processor that converts px to viewport units (vw, vh, vmin, vmax).",

  "author": "Dmitry Karpunin <koderfunk@gmail.com>",

    "url": "git@github.com:evrone/postcss-px-to-viewport.git"

  "bugs": "https://github.com/evrone/postcss-px-to-viewport/issues",

  "homepage": "https://github.com/evrone/postcss-px-to-viewport",

		{
		"name": "postcss-px-to-viewport",
		"description": "A CSS post-processor that converts px to viewport units (vw, vh, vmin, vmax).",
		"version": "0.0.1",
		"version": "0.0.2",
		"author": "Dmitry Karpunin <koderfunk@gmail.com>",
		@@ -6,0 +6,0 @@ "license": "MIT",

		@@ -20,4 +20,3 @@ 'use strict';
		selectorBlackList: [],
		//propWhiteList: ['font', 'font-size', 'line-height', 'letter-spacing'],
		replace: true,
		minPixelValue: 1,
		mediaQuery: false
		@@ -29,3 +28,3 @@ };
		var opts = objectAssign({}, defaults, options);
		var pxReplace = createPxReplace(opts.viewportWidth, opts.unitPrecision, opts.viewportUnit);
		var pxReplace = createPxReplace(opts.viewportWidth, opts.minPixelValue, opts.unitPrecision, opts.viewportUnit);

		@@ -38,12 +37,4 @@ return function (css) {

		// if (opts.propWhiteList.length && opts.propWhiteList.indexOf(decl.prop) === -1) return;

		if (blacklistedSelector(opts.selectorBlackList, decl.parent.selector)) return;

		//var value = decl.value.replace(pxRegex, pxReplace);
		//
		////// if viewport unit already exists, do not replace
		////if (declarationExists(decl.parent, decl.prop, value)) return;
		//
		//decl.value = value;
		decl.value = decl.value.replace(pxRegex, pxReplace);
		@@ -62,6 +53,7 @@ });

		function createPxReplace(viewportSize, unitPrecision, viewportUnit) {
		function createPxReplace(viewportSize, minPixelValue, unitPrecision, viewportUnit) {
		return function (m, $1) {
		if (!$1) return m;
		var pixels = parseFloat($1);
		if (pixels <= minPixelValue) return m;
		return toFixed((pixels / viewportSize * 100), unitPrecision) + viewportUnit;
		@@ -77,8 +69,2 @@ };

		//function declarationExists(decls, prop, value) {
		// return decls.some(function (decl) {
		// return (decl.prop === prop && decl.value === value);
		// });
		//}

		function blacklistedSelector(blacklist, selector) {
		@@ -85,0 +71,0 @@ if (typeof selector !== 'string') return;

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