postcss,(plugins): nanocss, postcss-preset-env

1 files changed, 108 insertions, 0 deletions

diff --git a/node_modules/postcss-normalize-whitespace/src/index.js b/node_modules/postcss-normalize-whitespace/src/index.js
new file mode 100644
index 00000000..bc7d6426
--- /dev/null
+++ b/node_modules/postcss-normalize-whitespace/src/index.js
@@ -0,0 +1,108 @@
+'use strict';
+const valueParser = require('postcss-value-parser');
+
+const atrule = 'atrule';
+const decl = 'decl';
+const rule = 'rule';
+const variableFunctions = new Set(['var', 'env', 'constant']);
+
+/**
+ * @param {valueParser.Node} node
+ * @return {void}
+ */
+function reduceCalcWhitespaces(node) {
+  if (node.type === 'space') {
+    node.value = ' ';
+  } else if (node.type === 'function') {
+    if (!variableFunctions.has(node.value.toLowerCase())) {
+      node.before = node.after = '';
+    }
+  }
+}
+/**
+ * @param {valueParser.Node} node
+ * @return {void | false}
+ */
+function reduceWhitespaces(node) {
+  if (node.type === 'space') {
+    node.value = ' ';
+  } else if (node.type === 'div') {
+    node.before = node.after = '';
+  } else if (node.type === 'function') {
+    if (!variableFunctions.has(node.value.toLowerCase())) {
+      node.before = node.after = '';
+    }
+    if (node.value.toLowerCase() === 'calc') {
+      valueParser.walk(node.nodes, reduceCalcWhitespaces);
+      return false;
+    }
+  }
+}
+
+/**
+ * @type {import('postcss').PluginCreator<void>}
+ * @return {import('postcss').Plugin}
+ */
+function pluginCreator() {
+  return {
+    postcssPlugin: 'postcss-normalize-whitespace',
+
+    OnceExit(css) {
+      const cache = new Map();
+
+      css.walk((node) => {
+        const { type } = node;
+
+        if ([decl, rule, atrule].includes(type) && node.raws.before) {
+          node.raws.before = node.raws.before.replace(/\s/g, '');
+        }
+
+        if (type === decl) {
+          // Ensure that !important values do not have any excess whitespace
+          if (node.important) {
+            node.raws.important = '!important';
+          }
+
+          // Remove whitespaces around ie 9 hack
+          node.value = node.value.replace(/\s*(\\9)\s*/, '$1');
+          const value = node.value;
+
+          if (cache.has(value)) {
+            node.value = cache.get(value);
+          } else {
+            const parsed = valueParser(node.value);
+            const result = parsed.walk(reduceWhitespaces).toString();
+
+            // Trim whitespace inside functions & dividers
+            node.value = result;
+            cache.set(value, result);
+          }
+
+          if (node.prop.startsWith('--') && node.value === '') {
+            node.value = ' ';
+          }
+          // Remove extra semicolons and whitespace before the declaration
+          if (node.raws.before) {
+            const prev = node.prev();
+
+            if (prev && prev.type !== rule) {
+              node.raws.before = node.raws.before.replace(/;/g, '');
+            }
+          }
+
+          node.raws.between = ':';
+          node.raws.semicolon = false;
+        } else if (type === rule || type === atrule) {
+          node.raws.between = node.raws.after = '';
+          node.raws.semicolon = false;
+        }
+      });
+
+      // Remove final newline
+      css.raws.after = '';
+    },
+  };
+}
+
+pluginCreator.postcss = true;
+module.exports = pluginCreator;