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node_modules/postcss-px-to-viewport/index.js

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+'use strict';
+
+var postcss = require('postcss');
+var objectAssign = require('object-assign');
+var { createPropListMatcher } = require('./src/prop-list-matcher');
+var { getUnitRegexp } = require('./src/pixel-unit-regexp');
+
+var defaults = {
+  unitToConvert: 'px',
+  viewportWidth: 320,
+  viewportHeight: 568, // not now used; TODO: need for different units and math for different properties
+  unitPrecision: 5,
+  viewportUnit: 'vw',
+  fontViewportUnit: 'vw',  // vmin is more suitable.
+  selectorBlackList: [],
+  propList: ['*'],
+  minPixelValue: 1,
+  mediaQuery: false,
+  replace: true,
+  landscape: false,
+  landscapeUnit: 'vw',
+  landscapeWidth: 568
+};
+
+module.exports = postcss.plugin('postcss-px-to-viewport', function (options) {
+  
+  var opts = objectAssign({}, defaults, options);
+
+  var pxRegex = getUnitRegexp(opts.unitToConvert);
+  var satisfyPropList = createPropListMatcher(opts.propList);
+  var landscapeRules = [];
+  
+  return function (css) {
+    css.walkRules(function (rule) {
+      // Add exclude option to ignore some files like 'node_modules'
+      var file = rule.source && rule.source.input.file;
+
+      if (opts.exclude && file) {
+        if (Object.prototype.toString.call(opts.exclude) === '[object RegExp]') {
+          if (isExclude(opts.exclude, file)) return;
+        } else if (Object.prototype.toString.call(opts.exclude) === '[object Array]') {
+          for (let i = 0; i < opts.exclude.length; i++) {
+            if (isExclude(opts.exclude[i], file)) return;
+          }
+        } else {
+          throw new Error('options.exclude should be RegExp or Array.');
+        }
+      }
+      
+      if (blacklistedSelector(opts.selectorBlackList, rule.selector)) return;
+
+      if (opts.landscape && !rule.parent.params) {
+        var landscapeRule = rule.clone().removeAll();
+
+        rule.walkDecls(function(decl) {
+          if (decl.value.indexOf(opts.unitToConvert) === -1) return;
+          if (!satisfyPropList(decl.prop)) return;
+          
+          landscapeRule.append(decl.clone({
+            value: decl.value.replace(pxRegex, createPxReplace(opts, opts.landscapeUnit, opts.landscapeWidth))
+          }));
+        });
+        
+        if (landscapeRule.nodes.length > 0) {
+          landscapeRules.push(landscapeRule); 
+        }
+      }
+
+      if (!validateParams(rule.parent.params, opts.mediaQuery)) return;
+      
+      rule.walkDecls(function(decl, i) {
+        if (decl.value.indexOf(opts.unitToConvert) === -1) return;
+        if (!satisfyPropList(decl.prop)) return;
+
+        var unit;
+        var size;
+        var params = rule.parent.params;
+        
+        if (opts.landscape && params && params.indexOf('landscape') !== -1) {
+          unit = opts.landscapeUnit;
+          size = opts.landscapeWidth;
+        } else {
+          unit = getUnit(decl.prop, opts);
+          size = opts.viewportWidth;
+        }
+        
+        var value = decl.value.replace(pxRegex, createPxReplace(opts, unit, size));
+        
+        if (declarationExists(decl.parent, decl.prop, value)) return;
+        
+        if (opts.replace) {
+          decl.value = value;
+        } else {
+          decl.parent.insertAfter(i, decl.clone({ value: value }));
+        }
+      });
+    });
+    
+    if (landscapeRules.length > 0) {
+      var landscapeRoot = new postcss.atRule({ params: '(orientation: landscape)', name: 'media' });
+      
+      landscapeRules.forEach(function(rule) {
+        landscapeRoot.append(rule);
+      });
+      css.append(landscapeRoot);
+    }
+  };
+});
+
+function getUnit(prop, opts) {
+  return prop.indexOf('font') === -1 ? opts.viewportUnit : opts.fontViewportUnit;
+}
+
+function createPxReplace(opts, viewportUnit, viewportSize) {
+  return function (m, $1) {
+    if (!$1) return m;
+    var pixels = parseFloat($1);
+    if (pixels <= opts.minPixelValue) return m;
+    var parsedVal = toFixed((pixels / viewportSize * 100), opts.unitPrecision);
+    return parsedVal === 0 ? '0' : parsedVal + viewportUnit;
+  };
+}
+
+function toFixed(number, precision) {
+  var multiplier = Math.pow(10, precision + 1),
+    wholeNumber = Math.floor(number * multiplier);
+  return Math.round(wholeNumber / 10) * 10 / multiplier;
+}
+
+function blacklistedSelector(blacklist, selector) {
+  if (typeof selector !== 'string') return;
+  return blacklist.some(function (regex) {
+    if (typeof regex === 'string') return selector.indexOf(regex) !== -1;
+    return selector.match(regex);
+  });
+}
+
+function isExclude(reg, file) {
+  if (Object.prototype.toString.call(reg) !== '[object RegExp]') {
+    throw new Error('options.exclude should be RegExp.');
+  }
+  return file.match(reg) !== null;
+}
+
+function declarationExists(decls, prop, value) {
+  return decls.some(function (decl) {
+      return (decl.prop === prop && decl.value === value);
+  });
+}
+
+function validateParams(params, mediaQuery) {
+  return !params || (params && mediaQuery);
+}