Add jsonc/space-unary-ops rule (#7)

* Add `jsonc/space-unary-ops` rule

* update

Author: ota-meshi

README.md

@@ -162,6 +162,7 @@ The rules with the following star :star: are included in the config.
 | [jsonc/quote-props](https://ota-meshi.github.io/eslint-plugin-jsonc/rules/quote-props.html) | require quotes around object literal property names | :wrench: | :star: | :star: |  |
 | [jsonc/quotes](https://ota-meshi.github.io/eslint-plugin-jsonc/rules/quotes.html) | enforce use of double or single quotes | :wrench: | :star: | :star: |  |
 | [jsonc/sort-keys](https://ota-meshi.github.io/eslint-plugin-jsonc/rules/sort-keys.html) | require object keys to be sorted |  |  |  |  |
+| [jsonc/space-unary-ops](https://ota-meshi.github.io/eslint-plugin-jsonc/rules/space-unary-ops.html) | disallow spaces after unary operators | :wrench: | :star: | :star: | :star: |
 
 <!--RULES_TABLE_END-->
 <!--RULES_SECTION_END-->

docs/rules/README.md

@@ -40,3 +40,4 @@ The rules with the following star :star: are included in the `plugin:jsonc/recom
 | [jsonc/quote-props](./quote-props.md) | require quotes around object literal property names | :wrench: | :star: | :star: |  |
 | [jsonc/quotes](./quotes.md) | enforce use of double or single quotes | :wrench: | :star: | :star: |  |
 | [jsonc/sort-keys](./sort-keys.md) | require object keys to be sorted |  |  |  |  |
+| [jsonc/space-unary-ops](./space-unary-ops.md) | disallow spaces after unary operators | :wrench: | :star: | :star: | :star: |

docs/rules/space-unary-ops.md

@@ -0,0 +1,50 @@
+---
+pageClass: "rule-details"
+sidebarDepth: 0
+title: "jsonc/space-unary-ops"
+description: "disallow spaces after unary operators"
+---
+# jsonc/space-unary-ops
+
+> disallow spaces after unary operators
+
+- :gear: This rule is included in all of `"plugin:jsonc/recommended-with-json"`, `"plugin:jsonc/recommended-with-json5"` and `"plugin:jsonc/recommended-with-jsonc"`.
+- :wrench: The `--fix` option on the [command line](https://eslint.org/docs/user-guide/command-line-interface#fixing-problems) can automatically fix some of the problems reported by this rule.
+
+## :book: Rule Details
+
+This rule reports the space after the sign operator.  
+
+JSON, JSONC and JSON5 do not allow spaces after the sign.
+
+<eslint-code-block fix>
+
+```json5
+/* eslint jsonc/space-unary-ops: 'error' */
+{
+    /* ✓ GOOD */
+    "GOOD": -42,
+
+    /* ✗ BAD */
+    "BAD": -  42
+}
+```
+
+</eslint-code-block>
+
+## :wrench: Options
+
+Nothing.
+
+## :couple: Related rules
+
+- [space-unary-ops]
+
+[space-unary-ops]: https://eslint.org/docs/rules/space-unary-ops
+
+## Implementation
+
+- [Rule source](https://github.com/ota-meshi/eslint-plugin-jsonc/blob/master/lib/rules/space-unary-ops.ts)
+- [Test source](https://github.com/ota-meshi/eslint-plugin-jsonc/blob/master/tests/lib/rules/space-unary-ops.js)
+
+<sup>Taken with ❤️ [from ESLint core](https://eslint.org/docs/rules/space-unary-ops)</sup>

lib/configs/recommended-with-json.ts

@@ -16,6 +16,7 @@ export = {
         "jsonc/no-useless-escape": "error",
         "jsonc/quote-props": "error",
         "jsonc/quotes": "error",
+        "jsonc/space-unary-ops": "error",
         "jsonc/valid-json-number": "error",
     },
 }

lib/configs/recommended-with-json5.ts

@@ -11,5 +11,6 @@ export = {
         "jsonc/no-template-literals": "error",
         "jsonc/no-undefined-value": "error",
         "jsonc/no-useless-escape": "error",
+        "jsonc/space-unary-ops": "error",
     },
 }

lib/configs/recommended-with-jsonc.ts

@@ -14,6 +14,7 @@ export = {
         "jsonc/no-useless-escape": "error",
         "jsonc/quote-props": "error",
         "jsonc/quotes": "error",
+        "jsonc/space-unary-ops": "error",
         "jsonc/valid-json-number": "error",
     },
 }

lib/rules/space-unary-ops.ts

@@ -0,0 +1,19 @@
+import coreRule from "eslint/lib/rules/space-unary-ops"
+import { createRule, defineWrapperListener } from "../utils"
+
+export default createRule("space-unary-ops", {
+    meta: {
+        docs: {
+            description: "disallow spaces after unary operators",
+            recommended: ["json", "jsonc", "json5"],
+            extensionRule: true,
+        },
+        fixable: coreRule.meta!.fixable,
+        schema: coreRule.meta!.schema!,
+        messages: coreRule.meta!.messages!,
+        type: coreRule.meta!.type!,
+    },
+    create(context) {
+        return defineWrapperListener(coreRule, context, [{ nonwords: false }])
+    },
+})

lib/utils/rules.ts

@@ -20,6 +20,7 @@ import objectPropertyNewline from "../rules/object-property-newline"
 import quoteProps from "../rules/quote-props"
 import quotes from "../rules/quotes"
 import sortKeys from "../rules/sort-keys"
+import spaceUnaryOps from "../rules/space-unary-ops"
 import validJsonNumber from "../rules/valid-json-number"
 
 export const rules = [
@@ -44,5 +45,6 @@ export const rules = [
     quoteProps,
     quotes,
     sortKeys,
+    spaceUnaryOps,
     validJsonNumber,
 ] as RuleModule[]

tests/lib/rules/space-unary-ops.ts

@@ -0,0 +1,42 @@
+import { RuleTester } from "eslint"
+import rule from "../../../lib/rules/space-unary-ops"
+
+const tester = new RuleTester({
+    parser: require.resolve("../../../lib/parser/json-eslint-parser"),
+})
+
+tester.run("space-unary-ops", rule as any, {
+    valid: ["-1", "+1", "-0", "+0"],
+    invalid: [
+        {
+            code: "[- 1, +  1, -  0, +  0]",
+            output: "[-1, +1, -0, +0]",
+            errors: [
+                {
+                    message: "Unexpected space after unary operator '-'.",
+                    line: 1,
+                    column: 2,
+                    endColumn: 5,
+                },
+                {
+                    message: "Unexpected space after unary operator '+'.",
+                    line: 1,
+                    column: 7,
+                    endColumn: 11,
+                },
+                {
+                    message: "Unexpected space after unary operator '-'.",
+                    line: 1,
+                    column: 13,
+                    endColumn: 17,
+                },
+                {
+                    message: "Unexpected space after unary operator '+'.",
+                    line: 1,
+                    column: 19,
+                    endColumn: 23,
+                },
+            ],
+        },
+    ],
+})