rome · ematipico · Jun 21, 2023 · Jun 18, 2023 · Jun 18, 2023 · Jun 19, 2023
diff --git a/.github/labeler.yml b/.github/labeler.yml
@@ -17,6 +17,7 @@ A-Project:
 A-Linter:
   - crates/rome_analyze/**
   - crates/rome_js_analyze/**
+  - crates/rome_json_analyze/**
 
 A-Parser:
   - crates/rome_parser/**

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -70,6 +70,7 @@ rome_json_factory = { version = "0.0.1", path = "./crates/rome_json_factory" }
 tests_macros = { path = "./crates/tests_macros" }
 rome_formatter_test = { path = "./crates/rome_formatter_test" }
 rome_js_analyze  = { path = "./crates/rome_js_analyze" }
+rome_json_analyze  = { path = "./crates/rome_json_analyze" }
 schemars = { version = "0.8.10" }
 smallvec = { version = "1.8.0", features = ["union", "const_new"] }
 

diff --git a/crates/rome_analyze/src/registry.rs b/crates/rome_analyze/src/registry.rs
@@ -57,7 +57,7 @@ pub trait RegistryVisitor<L: Language> {
 
 /// Stores metadata information for all the rules in the registry, sorted
 /// alphabetically
-#[derive(Default)]
+#[derive(Debug, Default)]
 pub struct MetadataRegistry {
     inner: BTreeSet<MetadataKey>,
 }

diff --git a/crates/rome_diagnostics_categories/src/categories.rs b/crates/rome_diagnostics_categories/src/categories.rs
@@ -97,6 +97,7 @@ define_categories! {
     "lint/nursery/useLiteralKeys": "https://docs.rome.tools/lint/rules/useLiteralKeys",
     "lint/nursery/useSimpleNumberKeys": "https://docs.rome.tools/lint/rules/useSimpleNumberKeys",
     "lint/nursery/noStaticOnlyClass": "https://docs.rome.tools/lint/rules/noStaticOnlyClass",
+    "lint/nursery/noDuplicateJsonKeys": "https://docs.rome.tools/lint/rules/noDuplicateJsonKeys",
     "lint/nursery/useNamingConvention": "https://docs.rome.tools/lint/rules/useNamingConvention",
     // Insert new nursery rule here
 

diff --git a/crates/rome_js_analyze/Cargo.toml b/crates/rome_js_analyze/Cargo.toml
@@ -23,7 +23,7 @@ rome_aria = { workspace = true }
 roaring = "0.10.1"
 rustc-hash = { workspace = true }
 serde = { version = "1.0.136", features = ["derive"] }
-serde_json = { version = "1.0.74", features = ["raw_value"] }
+serde_json = { version = "1.0.74" }
 lazy_static = { workspace = true }
 natord = "1.0.9"
 bpaf.workspace = true

diff --git a/crates/rome_json_analyze/Cargo.toml b/crates/rome_json_analyze/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "rome_json_analyze"
+version = "0.0.0"
+edition.workspace = true
+authors.workspace = true
+repository.workspace = true
+license.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rome_analyze = { workspace = true }
+rome_json_syntax = { workspace = true }
+rome_rowan = { workspace = true }
+rome_console = { workspace = true }
+rome_diagnostics = { workspace = true }
+lazy_static = { workspace = true }
+
+[dev-dependencies]
+rome_deserialize = { workspace = true }
+rome_json_parser = { workspace = true }
+rome_json_factory = { workspace = true }
+tests_macros = { workspace = true }
+rome_text_edit = { workspace = true }
+insta = { workspace = true, features = ["glob"] }
+countme = { workspace = true, features = ["enable"] }
+similar = "2.1.0"
+json_comments = "0.2.1"
+rome_service = { workspace = true }
diff --git a/crates/rome_json_analyze/src/analyzers.rs b/crates/rome_json_analyze/src/analyzers.rs
@@ -0,0 +1,4 @@
+//! Generated file, do not edit by hand, see `xtask/codegen`
+
+pub(crate) mod nursery;
+::rome_analyze::declare_category! { pub (crate) Analyzers { kind : Lint , groups : [self :: nursery :: Nursery ,] } }
diff --git a/crates/rome_json_analyze/src/analyzers/nursery.rs b/crates/rome_json_analyze/src/analyzers/nursery.rs
@@ -0,0 +1,5 @@
+//! Generated file, do not edit by hand, see `xtask/codegen`
+
+use rome_analyze::declare_group;
+pub(crate) mod no_duplicate_json_keys;
+declare_group! { pub (crate) Nursery { name : "nursery" , rules : [self :: no_duplicate_json_keys :: NoDuplicateJsonKeys ,] } }
diff --git a/crates/rome_json_analyze/src/analyzers/nursery/no_duplicate_json_keys.rs b/crates/rome_json_analyze/src/analyzers/nursery/no_duplicate_json_keys.rs
@@ -0,0 +1,109 @@
+use rome_analyze::{context::RuleContext, declare_rule, Ast, Rule, RuleDiagnostic};
+use rome_console::markup;
+use rome_json_syntax::{JsonMemberName, JsonObjectValue, TextRange};
+use rome_rowan::{AstNode, AstSeparatedList};
+use std::collections::HashMap;
+
+declare_rule! {
+    /// Disallow two keys with the same name inside a JSON object.
+    ///
+    /// ## Examples
+    ///
+    /// ### Invalid
+    ///
+    /// ```json,expect_diagnostic
+    /// {
+    ///   "title": "New title",
+    ///   "title": "Second title"
+    /// }
+    /// ```
+    ///
+    /// ### Valid
+    ///
+    /// ```json
+    /// {
+    ///   "title": "New title",
+    ///   "secondTitle": "Second title"
+    /// }
+    /// ```
+    pub(crate) NoDuplicateJsonKeys {
+        version: "next",
+        name: "noDuplicateJsonKeys",
+        recommended: true,
+    }
+}
+
+pub(crate) struct DuplicatedKeys {
+    /// The fist key, which should be the correct one
+    original_key: JsonMemberName,
+    /// The ranges where the duplicated keys are found
+    duplicated_keys: Vec<TextRange>,
+}
+
+impl Rule for NoDuplicateJsonKeys {
+    type Query = Ast<JsonObjectValue>;
+    type State = DuplicatedKeys;
+    type Signals = Option<Self::State>;
+    type Options = ();
+
+    fn run(ctx: &RuleContext<Self>) -> Self::Signals {
+        let query = ctx.query();
+        let mut names = HashMap::<String, Vec<TextRange>>::new();
+        let mut original_key = None;
+        for (index, member) in query.json_member_list().iter().flatten().enumerate() {
+            let name = member.name().ok()?;
+            if index == 0 {
+                original_key = Some(name.clone());
+            }
+            let text = name.inner_string_text().ok()?;
+            if let Some(ranges) = names.get_mut(text.text()) {
+                ranges.push(name.range());
+            } else {
+                names.insert(text.text().to_string(), vec![]);
+            }
+        }
+
+        let duplicated_keys: Vec<_> = names
+            .into_values()
+            .filter(|ranges| !ranges.is_empty())
+            .flatten()
+            .collect();
+
+        if !duplicated_keys.is_empty() {
+            let Some(original_key) = original_key else { return None};
+
+            return Some(DuplicatedKeys {
+                original_key,
+                duplicated_keys,
+            });
+        }
+        None
+    }
+
+    fn diagnostic(_ctx: &RuleContext<Self>, state: &Self::State) -> Option<RuleDiagnostic> {
+        let DuplicatedKeys {
+            duplicated_keys,
+            original_key,
+        } = state;
+        let mut diagnostic = RuleDiagnostic::new(
+            rule_category!(),
+            original_key.range(),
+            markup! {
+                "The key "<Emphasis>{{original_key.inner_string_text().ok()?.text()}}</Emphasis>" was already declared."
+            },
+        );
+        for range in duplicated_keys {
+            diagnostic = diagnostic.detail(
+                range,
+                markup! {
+                    "This where a duplicated key was declared again."
+                },
+            );
+        }
+        Some(diagnostic.note(
+            markup! {
+                "If a key is defined multiple times, only the last definition takes effect. Previous definitions are ignored."
+            },
+        ))
+    }
+}
diff --git a/crates/rome_json_analyze/src/diagnostics.rs b/crates/rome_json_analyze/src/diagnostics.rs
@@ -0,0 +1,5 @@
+use rome_diagnostics::Diagnostic;
+
+#[derive(Clone, Debug, PartialEq, Eq, Diagnostic)]
+#[diagnostic(category = "suppressions/parse")]
+pub struct SuppressionDiagnostic {}