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backend/node_modules/postcss-reduce-transforms/src/index.js

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+'use strict';
+const valueParser = require('postcss-value-parser');
+
+/**
+ * @param {(number|string)[]} list
+ * @param {valueParser.Node} node
+ * @param {number} index
+ * @return {(number|string)[]}
+ */
+function getValues(list, node, index) {
+  if (index % 2 === 0) {
+    /** @type {number|string} */
+    let value = NaN;
+
+    if (
+      node.type === 'function' &&
+      (node.value === 'var' || node.value === 'env') &&
+      node.nodes.length === 1
+    ) {
+      value = valueParser.stringify(node.nodes);
+    } else if (node.type === 'word') {
+      value = parseFloat(node.value);
+    }
+
+    return [...list, value];
+  }
+
+  return list;
+}
+
+/**
+ * @param {valueParser.FunctionNode} node
+ * @param {(number|string)[]} values
+ * @return {void}
+ */
+function matrix3d(node, values) {
+  if (values.length !== 16) {
+    return;
+  }
+
+  // matrix3d(a, b, 0, 0, c, d, 0, 0, 0, 0, 1, 0, tx, ty, 0, 1) => matrix(a, b, c, d, tx, ty)
+  if (
+    values[15] &&
+    values[2] === 0 &&
+    values[3] === 0 &&
+    values[6] === 0 &&
+    values[7] === 0 &&
+    values[8] === 0 &&
+    values[9] === 0 &&
+    values[10] === 1 &&
+    values[11] === 0 &&
+    values[14] === 0 &&
+    values[15] === 1
+  ) {
+    const { nodes } = node;
+
+    node.value = 'matrix';
+    node.nodes = [
+      nodes[0], // a
+      nodes[1], // ,
+      nodes[2], // b
+      nodes[3], // ,
+      nodes[8], // c
+      nodes[9], // ,
+      nodes[10], // d
+      nodes[11], // ,
+      nodes[24], // tx
+      nodes[25], // ,
+      nodes[26], // ty
+    ];
+  }
+}
+
+const rotate3dMappings = new Map([
+  [[1, 0, 0].toString(), 'rotateX'], // rotate3d(1, 0, 0, a) => rotateX(a)
+  [[0, 1, 0].toString(), 'rotateY'], // rotate3d(0, 1, 0, a) => rotateY(a)
+  [[0, 0, 1].toString(), 'rotate'], // rotate3d(0, 0, 1, a) => rotate(a)
+]);
+
+/**
+ * @param {valueParser.FunctionNode} node
+ * @param {(number|string)[]} values
+ * @return {void}
+ */
+function rotate3d(node, values) {
+  if (values.length !== 4) {
+    return;
+  }
+
+  const { nodes } = node;
+  const match = rotate3dMappings.get(values.slice(0, 3).toString());
+
+  if (match) {
+    node.value = match;
+    node.nodes = [nodes[6]];
+  }
+}
+
+/**
+ * @param {valueParser.FunctionNode} node
+ * @param {(number|string)[]} values
+ * @return {void}
+ */
+function rotateZ(node, values) {
+  if (values.length !== 1) {
+    return;
+  }
+
+  // rotateZ(rz) => rotate(rz)
+  node.value = 'rotate';
+}
+
+/**
+ * @param {valueParser.FunctionNode} node
+ * @param {(number|string)[]} values
+ * @return {void}
+ */
+function scale(node, values) {
+  if (values.length !== 2) {
+    return;
+  }
+
+  const { nodes } = node;
+  const [first, second] = values;
+
+  // scale(sx, sy) => scale(sx)
+  if (first === second) {
+    node.nodes = [nodes[0]];
+
+    return;
+  }
+
+  // scale(sx, 1) => scaleX(sx)
+  if (second === 1) {
+    node.value = 'scaleX';
+    node.nodes = [nodes[0]];
+
+    return;
+  }
+
+  // scale(1, sy) => scaleY(sy)
+  if (first === 1) {
+    node.value = 'scaleY';
+    node.nodes = [nodes[2]];
+
+    return;
+  }
+}
+
+/**
+ * @param {valueParser.FunctionNode} node
+ * @param {(number|string)[]} values
+ * @return {void}
+ */
+function scale3d(node, values) {
+  if (values.length !== 3) {
+    return;
+  }
+
+  const { nodes } = node;
+  const [first, second, third] = values;
+
+  // scale3d(sx, 1, 1) => scaleX(sx)
+  if (second === 1 && third === 1) {
+    node.value = 'scaleX';
+    node.nodes = [nodes[0]];
+
+    return;
+  }
+
+  // scale3d(1, sy, 1) => scaleY(sy)
+  if (first === 1 && third === 1) {
+    node.value = 'scaleY';
+    node.nodes = [nodes[2]];
+
+    return;
+  }
+
+  // scale3d(1, 1, sz) => scaleZ(sz)
+  if (first === 1 && second === 1) {
+    node.value = 'scaleZ';
+    node.nodes = [nodes[4]];
+
+    return;
+  }
+}
+
+/**
+ * @param {valueParser.FunctionNode} node
+ * @param {(number|string)[]} values
+ * @return {void}
+ */
+function translate(node, values) {
+  if (values.length !== 2) {
+    return;
+  }
+
+  const { nodes } = node;
+
+  // translate(tx, 0) => translate(tx)
+  if (values[1] === 0) {
+    node.nodes = [nodes[0]];
+
+    return;
+  }
+
+  // translate(0, ty) => translateY(ty)
+  if (values[0] === 0) {
+    node.value = 'translateY';
+    node.nodes = [nodes[2]];
+
+    return;
+  }
+}
+
+/**
+ * @param {valueParser.FunctionNode} node
+ * @param {(number|string)[]} values
+ * @return {void}
+ */
+function translate3d(node, values) {
+  if (values.length !== 3) {
+    return;
+  }
+
+  const { nodes } = node;
+
+  // translate3d(0, 0, tz) => translateZ(tz)
+  if (values[0] === 0 && values[1] === 0) {
+    node.value = 'translateZ';
+    node.nodes = [nodes[4]];
+  }
+}
+
+const reducers = new Map([
+  ['matrix3d', matrix3d],
+  ['rotate3d', rotate3d],
+  ['rotateZ', rotateZ],
+  ['scale', scale],
+  ['scale3d', scale3d],
+  ['translate', translate],
+  ['translate3d', translate3d],
+]);
+/**
+ * @param {string} name
+ * @return {string}
+ */
+function normalizeReducerName(name) {
+  const lowerCasedName = name.toLowerCase();
+
+  if (lowerCasedName === 'rotatez') {
+    return 'rotateZ';
+  }
+
+  return lowerCasedName;
+}
+
+/**
+ * @param {valueParser.Node} node
+ * @return {false}
+ */
+function reduce(node) {
+  if (node.type === 'function') {
+    const normalizedReducerName = normalizeReducerName(node.value);
+    const reducer = reducers.get(normalizedReducerName);
+    if (reducer !== undefined) {
+      reducer(node, node.nodes.reduce(getValues, []));
+    }
+  }
+  return false;
+}
+
+/**
+ * @type {import('postcss').PluginCreator<void>}
+ * @return {import('postcss').Plugin}
+ */
+function pluginCreator() {
+  return {
+    postcssPlugin: 'postcss-reduce-transforms',
+    prepare() {
+      const cache = new Map();
+      return {
+        OnceExit(css) {
+          css.walkDecls(/transform$/i, (decl) => {
+            const value = decl.value;
+
+            if (!value) {
+              return;
+            }
+
+            if (cache.has(value)) {
+              decl.value = cache.get(value);
+
+              return;
+            }
+
+            const result = valueParser(value).walk(reduce).toString();
+
+            decl.value = result;
+            cache.set(value, result);
+          });
+        },
+      };
+    },
+  };
+}
+
+pluginCreator.postcss = true;
+module.exports = pluginCreator;