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node_modules/stylelint/lib/rules/function-whitespace-after/README.md

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+# function-whitespace-after
+
+Require or disallow whitespace after functions.
+
+```css
+a { transform: translate(1, 1) scale(3); }
+/**                           ↑
+ *                   This space */
+```
+
+This rule does not check for space immediately after `)` if the very next character is `,`, `)`, or `}`, allowing some of the patterns exemplified below.
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be whitespace after the function.
+
+The following patterns are considered warnings:
+
+```css
+a { transform: translate(1, 1)scale(3); }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { transform: translate(1, 1) scale(3); }
+```
+
+```css
+a { transform: translate(1, 1)     scale(3); }
+```
+
+```css
+a {
+  transform:
+    translate(1, 1)
+    scale(3);
+}
+```
+
+```css
+/* notice the two closing parentheses without a space between */
+a { top: calc(1 * (1 + 3)); }
+```
+
+```css
+/* notice the ), with no space after the closing parenthesis */
+a { padding: calc(1 * 2px), calc(2 * 5px); }
+```
+
+```scss
+/* notice the )}, with no space after the closing parenthesis */
+a {
+  max-height: #{($line-height) * ($lines-to-show)}em;
+}
+```
+
+```less
+/* notice the )}, with no space after the closing parenthesis */
+a {
+  max-height: ((@line-height) * (@lines-to-show))em;
+}
+```
+
+### `"never"`
+
+There *must never* be whitespace after the function.
+
+The following patterns are considered warnings:
+
+```css
+a { transform: translate(1, 1) scale(3); }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { transform: translate(1, 1)scale(3); }
+```

node_modules/stylelint/lib/rules/function-whitespace-after/index.js

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+"use strict"
+
+const isWhitespace = require("../../utils/isWhitespace")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const styleSearch = require("style-search")
+
+const ruleName = "function-whitespace-after"
+
+const messages = ruleMessages(ruleName, {
+  expected: "Expected whitespace after \")\"",
+  rejected: "Unexpected whitespace after \")\"",
+})
+
+const ACCEPTABLE_AFTER_CLOSING_PAREN = new Set([
+  ")",
+  ",",
+  "}",
+  ":",
+  undefined,
+])
+
+const rule = function (expectation) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "never",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkDecls(decl => {
+      const declString = decl.toString()
+
+      styleSearch({
+        source: declString,
+        target: ")",
+        functionArguments: "only",
+      }, match => {
+        checkClosingParen(declString, match.startIndex, decl)
+      })
+    })
+
+    function checkClosingParen(source, index, node) {
+      const nextChar = source[index + 1]
+      if (expectation === "always") {
+        // Allow for the next character to be a single empty space,
+        // another closing parenthesis, a comma, or the end of the value
+        if (nextChar === " ") {
+          return
+        }
+        if (nextChar === "\n") {
+          return
+        }
+        if (source.substr(index + 1, 2) === "\r\n") {
+          return
+        }
+        if (ACCEPTABLE_AFTER_CLOSING_PAREN.has(nextChar)) {
+          return
+        }
+        report({
+          message: messages.expected,
+          node,
+          index: index + 1,
+          result,
+          ruleName,
+        })
+      } else if (expectation === "never") {
+        if (isWhitespace(nextChar)) {
+          report({
+            message: messages.rejected,
+            node,
+            index: index + 1,
+            result,
+            ruleName,
+          })
+        }
+      }
+    }
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule