From 5de0ba055cef7f2dc5451b1eaf0857deb77ae009 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Sun, 24 Oct 2021 13:24:52 +0530
Subject: add support for json out

---
 lib/Cargo.toml | 10 ++++++++++
 lib/src/lib.rs | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

(limited to 'lib')

diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index e9e9e69..e9bca06 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -11,3 +11,13 @@ if_chain = "1.0"
 macros = { path = "../macros" }
 lazy_static = "1.0"
 rowan = "0.12.5"
+serde_json = { version = "1.0.68", optional = true }
+
+[dependencies.serde]
+version = "1.0.130"
+features = [ "derive" ]
+optional = true
+
+[features]
+default = []
+json-out = [ "serde", "serde_json" ]
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index d8a3859..bde039f 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -6,8 +6,12 @@ pub use lints::LINTS;
 use rnix::{SyntaxElement, SyntaxKind, TextRange};
 use std::{convert::Into, default::Default};
 
+#[cfg(feature = "json-out")]
+use serde::{Serialize, ser::{SerializeStruct, Serializer}};
+
 /// Report generated by a lint
 #[derive(Debug, Default)]
+#[cfg_attr(feature = "json-out", derive(Serialize))]
 pub struct Report {
     /// General information about this lint and where it applies.
     pub note: &'static str,
@@ -95,6 +99,27 @@ impl Diagnostic {
     }
 }
 
+#[cfg(feature = "json-out")]
+impl Serialize for Diagnostic {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut s = serializer.serialize_struct("Diagnostic", 3)?;
+        let at = {
+            let start = usize::from(self.at.start());
+            let end = usize::from(self.at.end());
+            (start, end)
+        };
+        s.serialize_field("at", &at)?;
+        s.serialize_field("message", &self.message)?;
+        if let Some(suggestion) = &self.suggestion {
+            s.serialize_field("suggestion", suggestion)?;
+        }
+        s.end()
+    }
+}
+
 /// Suggested fix for a diagnostic, the fix is provided as a syntax element.
 /// Look at `make.rs` to construct fixes.
 #[derive(Debug)]
@@ -119,6 +144,25 @@ impl Suggestion {
     }
 }
 
+#[cfg(feature = "json-out")]
+impl Serialize for Suggestion {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut s = serializer.serialize_struct("Suggestion", 2)?;
+        let at = {
+            let start = usize::from(self.at.start());
+            let end = usize::from(self.at.end());
+            (start, end)
+        };
+        let fix = self.fix.to_string();
+        s.serialize_field("at", &at)?;
+        s.serialize_field("fix", &fix)?;
+        s.end()
+    }
+}
+
 /// Lint logic is defined via this trait. Do not implement manually,
 /// look at the `lint` attribute macro instead for implementing rules
 pub trait Rule {
-- 
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