feat: read target file content

to-json/src/main.rs

@@ -1,104 +1,79 @@
+use std::fs::{read, read_to_string};
+use std::io::Read;
 use serde_json as json;
 use serde_yaml as yaml;
 
-const JSON_STR: &str = r#"
-{
-  "demo": "key_1",
-  "author": "dnomd343",
-  "test": [
-    "123",
-    "234",
-    "345"
-  ]
-}
-"#;
-
-const YAML_STR: &str = r#"
-demo: key_1
-author: dnomd343
-test:
-  - 123
-  - 234
-  - 345
-"#;
+const FILE_ERROR: i32 = 1; // file open error
+const PARSE_ERROR: i32 = 2; // parser error
 
-const TOML_STR: &str = r#"
-demo = "key_1"
-author = "dnomd343"
-test = [ 123, 234, 345 ]
-"#;
-
-#[derive(Debug)]
 enum Format {
     JSON(json::Value),
     YAML(yaml::Value),
     TOML(toml::Value),
 }
 
-fn parser(raw: &str) -> Option<Format> {
-    if let Ok(data) = json::from_str::<json::Value>(raw) { // try JSON format
+fn parser(content: &str) -> Option<Format> {
+    if let Ok(data) = json::from_str::<json::Value>(content) { // try JSON format
         return Some(Format::JSON(data));
     }
-    if let Ok(data) = toml::from_str::<toml::Value>(raw) { // try TOML format
+    if let Ok(data) = toml::from_str::<toml::Value>(content) { // try TOML format
         return Some(Format::TOML(data));
     }
-    if let Ok(data) = yaml::from_str::<yaml::Value>(raw) { // try YAML format
+    if let Ok(data) = yaml::from_str::<yaml::Value>(content) { // try YAML format
         return Some(Format::YAML(data));
     }
-    return None;
+    return None; // parse failed
 }
 
-fn to_json(raw: &str) -> String {
-    match parser(raw) {
+fn to_json(content: &str) -> String { // convert to JSON format
+    match parser(content) {
         Some(data) => match data {
             Format::JSON(dat) => json::to_string(&dat).unwrap(),
             Format::YAML(dat) => json::to_string(&dat).unwrap(),
             Format::TOML(dat) => json::to_string(&dat).unwrap(),
         },
-        None => std::process::exit(1),
+        None => std::process::exit(PARSE_ERROR), // error exit
+    }
+}
+
+fn read_file(path: &str) -> String { // read file content
+    match std::fs::File::open(path) {
+        Ok(mut file) => { // file open success
+            let mut content = String::new();
+            file.read_to_string(&mut content).unwrap(); // get file content
+            content
+        },
+        Err(_) => std::process::exit(FILE_ERROR), // read failed
     }
 }
 
 fn main() {
-    println!("---------------------------------");
-    println!("JSON raw content:\n{}", JSON_STR);
-    println!("---------------------------------");
-    println!("YAML raw content:\n{}", YAML_STR);
-    println!("---------------------------------");
-    println!("TOML raw content:\n{}", TOML_STR);
-    println!("---------------------------------");
 
-    let temp = to_json(JSON_STR);
-    println!("{}", temp);
+    let file_name = "test.json_";
 
-    // let a = String::from("ok");
-    // match parser(JSON_STR) {
-    //     Some(data) => {
-    //         // println!("{:#?}", data);
-    //         match data {
-    //             Format::JSON(dat) => {
-    //                 return json::to_string(&data).unwrap()
-    //             },
-    //             _ => println!("123"),
-    //             // Format::JSON(dat) => println!("{:#?}", dat),
-    //             // Format::YAML(dat) => println!("{:#?}", dat),
-    //             // Format::TOML(dat) => println!("{:#?}", dat),
-    //         }
-    //         // let temp = data;
-    //         // let ret = json::to_string(&data).unwrap();
-    //         // println!("JSON output ->\n{}", ret);
-    //     },
-    //     None => println!("parser error"),
-    // }
+    let content = read_file(file_name);
 
-    // let data = parser(JSON_STR);
-    // println!("{:#?}", data);
+    println!("{}", content);
 
-    // decode(YAML_STR);
-    // decode(TOML_STR);
+    // match std::fs::File::open(file_name) {
+    //     Ok(file) => {
+    //         read_to_string()
+    //     },
+    //     Err(_) => std::process::exit(FILE_ERROR),
+    // }
 
+    // let mut file = std::fs::File::open(file_name).unwrap();
+    // let mut contents = String::new();
+    // file.read_to_string(&mut contents).unwrap();
+    // println!("{}", contents);
 
+    // match std::fs::File::open(file_name) {
+    //     Ok(mut file) => {
+    //         let mut contents = String::new();
+    //         file.read_to_string(&mut contents).unwrap();
+    //         println!("{}", contents);
+    //     },
+    //     Err(_) => std::process::exit(FILE_ERROR),
+    // }
 
-    // let ret = serde_json::to_string(&data).unwrap();
-    // println!("JSON output ->\n{}", ret);
 }

to-json/test.json

@@ -0,0 +1,9 @@
+{
+  "demo": "key_1",
+  "author": "dnomd343",
+  "test": [
+    123,
+    234,
+    345
+  ]
+}

to-json/test.toml

@@ -0,0 +1,3 @@
+demo = "key_1"
+author = "dnomd343"
+test = [ 123, 234, 345 ]

to-json/test.yaml

@@ -0,0 +1,6 @@
+demo: key_1
+author: dnomd343
+test:
+  - 123
+  - 234
+  - 345