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node_modules/stylelint/lib/rules/number-leading-zero/README.md

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+# number-leading-zero
+
+Require or disallow a leading zero for fractional numbers less than 1.
+
+```css
+a { line-height: 0.5; }
+/**              ↑
+ * This leading zero */
+```
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be a leading zero.
+
+The following patterns are considered warnings:
+
+```css
+a { line-height: .5; }
+```
+
+```css
+a { transform: translate(2px, .4px); }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { line-height: 0.5; }
+```
+
+```css
+a { transform: translate(2px, 0.4px); }
+```
+
+### `"never"`
+
+There *must never* be a leading zero.
+
+The following patterns are considered warnings:
+
+```css
+a { line-height: 0.5; }
+```
+
+```css
+a { transform: translate(2px, 0.4px); }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { line-height: .5; }
+```
+
+```css
+a { transform: translate(2px, .4px); }
+```

node_modules/stylelint/lib/rules/number-leading-zero/index.js

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+"use strict"
+
+const atRuleParamIndex = require("../../utils/atRuleParamIndex")
+const declarationValueIndex = require("../../utils/declarationValueIndex")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const valueParser = require("postcss-value-parser")
+
+const ruleName = "number-leading-zero"
+
+const messages = ruleMessages(ruleName, {
+  expected: "Expected a leading zero",
+  rejected: "Unexpected leading zero",
+})
+
+const rule = function (expectation) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "never",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkAtRules(atRule => {
+      if (atRule.name.toLowerCase() === "import") {
+        return
+      }
+
+      check(atRule, atRule.params, atRuleParamIndex)
+    })
+
+    root.walkDecls(decl => check(decl, decl.value, declarationValueIndex))
+
+    function check(node, value, getIndex) {
+      // Get out quickly if there are no periods
+      if (value.indexOf(".") === -1) {
+        return
+      }
+
+      valueParser(value).walk(valueNode => {
+        // Ignore `url` function
+        if (valueNode.type === "function" && valueNode.value.toLowerCase() === "url") {
+          return false
+        }
+
+        // Ignore strings, comments, etc
+        if (valueNode.type !== "word") {
+          return
+        }
+
+        // Check leading zero
+        if (expectation === "always") {
+          const match = /(?:\D|^)(\.\d+)/.exec(valueNode.value)
+
+          if (match === null) {
+            return
+          }
+
+          // The regexp above consists of 2 capturing groups (or capturing parentheses).
+          // We need the index of the second group. This makes sanse when we have "-.5" as an input
+          // for regex. And we need the index of ".5".
+          const capturingGroupIndex = match[0].length - match[1].length
+          complain(messages.expected, node, getIndex(node) + valueNode.sourceIndex + match.index + capturingGroupIndex)
+        }
+
+        if (expectation === "never") {
+          const match = /(?:\D|^)(0+\.\d+)/.exec(valueNode.value)
+
+          if (match === null) {
+            return
+          }
+
+          const capturingGroupIndex = match[0].length - match[1].length
+          complain(messages.rejected, node, getIndex(node) + valueNode.sourceIndex + match.index + capturingGroupIndex)
+        }
+      })
+    }
+
+    function complain(message, node, index) {
+      report({
+        result,
+        ruleName,
+        message,
+        node,
+        index,
+      })
+    }
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule