1 files changed, 47 insertions, 0 deletions
diff --git a/third_party/rust/toml/examples/toml2json.rs b/third_party/rust/toml/examples/toml2json.rs
new file mode 100644
index 0000000000..1b90c9fde5
--- /dev/null
+++ b/third_party/rust/toml/examples/toml2json.rs
@@ -0,0 +1,47 @@
+#![deny(warnings)]
+
+use std::env;
+use std::fs::File;
+use std::io;
+use std::io::prelude::*;
+
+use serde_json::Value as Json;
+use toml::Value as Toml;
+
+fn main() {
+    let mut args = env::args();
+    let mut input = String::new();
+    if args.len() > 1 {
+        let name = args.nth(1).unwrap();
+        File::open(&name)
+            .and_then(|mut f| f.read_to_string(&mut input))
+            .unwrap();
+    } else {
+        io::stdin().read_to_string(&mut input).unwrap();
+    }
+
+    match input.parse() {
+        Ok(toml) => {
+            let json = convert(toml);
+            println!("{}", serde_json::to_string_pretty(&json).unwrap());
+        }
+        Err(error) => println!("failed to parse TOML: {}", error),
+    }
+}
+
+fn convert(toml: Toml) -> Json {
+    match toml {
+        Toml::String(s) => Json::String(s),
+        Toml::Integer(i) => Json::Number(i.into()),
+        Toml::Float(f) => {
+            let n = serde_json::Number::from_f64(f).expect("float infinite and nan not allowed");
+            Json::Number(n)
+        }
+        Toml::Boolean(b) => Json::Bool(b),
+        Toml::Array(arr) => Json::Array(arr.into_iter().map(convert).collect()),
+        Toml::Table(table) => {
+            Json::Object(table.into_iter().map(|(k, v)| (k, convert(v))).collect())
+        }
+        Toml::Datetime(dt) => Json::String(dt.to_string()),
+    }
+}