added hover prefixer

1 files changed, 98 insertions, 0 deletions

diff --git a/node_modules/postcss-calc/src/lib/stringifier.js b/node_modules/postcss-calc/src/lib/stringifier.js
new file mode 100644
index 00000000..50195bb5
--- /dev/null
+++ b/node_modules/postcss-calc/src/lib/stringifier.js
@@ -0,0 +1,98 @@
+'use strict';
+const order = {
+  '*': 0,
+  '/': 0,
+  '+': 1,
+  '-': 1,
+};
+
+/**
+ * @param {number} value
+ * @param {number | false} prec
+ */
+function round(value, prec) {
+  if (prec !== false) {
+    const precision = Math.pow(10, prec);
+    return Math.round(value * precision) / precision;
+  }
+  return value;
+}
+
+/**
+ * @param {number | false} prec
+ * @param {import('../parser').CalcNode} node
+ *
+ * @return {string}
+ */
+function stringify(node, prec) {
+  switch (node.type) {
+    case 'MathExpression': {
+      const { left, right, operator: op } = node;
+      let str = '';
+      if (left.type === 'MathExpression' && order[op] < order[left.operator]) {
+        str += `(${stringify(left, prec)})`;
+      } else {
+        str += stringify(left, prec);
+      }
+
+      str += order[op] ? ` ${node.operator} ` : node.operator;
+
+      if (
+        right.type === 'MathExpression' &&
+        order[op] < order[right.operator]
+      ) {
+        str += `(${stringify(right, prec)})`;
+      } else {
+        str += stringify(right, prec);
+      }
+
+      return str;
+    }
+    case 'Number':
+      return round(node.value, prec).toString();
+    case 'Function':
+      return node.value.toString();
+    case 'ParenthesizedExpression':
+      return `(${stringify(node.content, prec)})`;
+    default:
+      return round(node.value, prec) + node.unit;
+  }
+}
+
+/**
+ * @param {string} calc
+ * @param {import('../parser').CalcNode} node
+ * @param {string} originalValue
+ * @param {{precision: number | false, warnWhenCannotResolve: boolean}} options
+ * @param {import("postcss").Result} result
+ * @param {import("postcss").ChildNode} item
+ *
+ * @returns {string}
+ */
+module.exports = function (calc, node, originalValue, options, result, item) {
+  let str = stringify(node, options.precision);
+
+  const shouldPrintCalc =
+    node.type === 'MathExpression' || node.type === 'Function' ||
+    node.type === 'ParenthesizedExpression';
+
+  if (shouldPrintCalc) {
+    // if calc expression couldn't be resolved to a single value, re-wrap it as
+    // a calc()
+    if (node.type === 'ParenthesizedExpression') {
+      str = `${calc}${str}`;
+    } else {
+      str = `${calc}(${str})`;
+    }
+
+    // if the warnWhenCannotResolve option is on, inform the user that the calc
+    // expression could not be resolved to a single value
+    if (options.warnWhenCannotResolve) {
+      result.warn('Could not reduce expression: ' + originalValue, {
+        plugin: 'postcss-calc',
+        node: item,
+      });
+    }
+  }
+  return str;
+};