lib behaves more like a lib.

src/lib.rs

@@ -1,24 +1,9 @@
-use graphql_parser::query;
-use graphql_parser::schema;
+use graphql_parser::{query, schema};
 
-pub mod error_codes;
-
-pub fn load_schema(schema: &str) -> schema::Document<String> {
- let schema = schema::parse_schema::<String>(schema).unwrap_or_else(|err| {
- eprintln!("Error parsing schema: {}", err);
- std::process::exit(error_codes::ERROR_INVALID_SCHEMA);
- });
- dbg!("schema: {:#?}", &schema);
-
- schema
+pub fn parse_schema(schema: &str) -> Result<schema::Document<String>, schema::ParseError> {
+ schema::parse_schema::<String>(schema)
 }
 
-pub fn parse_query(query: &str) -> query::Document<String> {
- let query = query::parse_query::<String>(query).unwrap_or_else(|err| {
- eprintln!("Error parsing query: {}", err);
- std::process::exit(error_codes::ERROR_INVALID_QUERY);
- });
- dbg!("query: {:#?}", &query);
-
- query
+pub fn parse_query(query: &str) -> Result<query::Document<String>, query::ParseError> {
+ query::parse_query::<String>(query)
 }

src/main.rs

@@ -1,4 +1,5 @@
-use std::{env, fs, process};
+use std::{env, fs, io, process};
+use std::io::Write;
 
 fn main() {
  // Get the schema file from the command line arguments or use the default.
@@ -12,9 +13,34 @@ fn main() {
  process::exit(error_codes::ERROR_INVALID_SCHEMA_FILE);
  });
 
- minigraf::load_schema(&schema_file);
+ let schema = minigraf::parse_schema(&schema_file).unwrap_or_else(|err| {
+ eprintln!("Error parsing schema: {}", err);
+ process::exit(error_codes::ERROR_INVALID_SCHEMA);
+ });
+ dbg!("schema: {:#?}", &schema);
+
+ // Start a Read-Eval-Print-Loop (REPL) for the user to enter queries.
+ loop {
+ // Prompt the user for a query.
+ print!("> ");
+ io::stdout().flush().unwrap();
+
+ // Get the query from the user.
+ let mut query = String::new();
+ io::stdin().read_line(&mut query).unwrap();
+ let query = query.trim();
+
+ // Parse the query into a query object.
+ let query = minigraf::parse_query(query);
+ if query.is_err() {
+ eprintln!("Error parsing query: {}", query.unwrap_err());
+ continue;
+ }
+ dbg!("query: {:#?}", &query);
+ }
 }
 
 mod error_codes {
- pub const ERROR_INVALID_SCHEMA_FILE: i32 = -1;
+ pub const ERROR_INVALID_SCHEMA_FILE: i32 = 1;
+ pub const ERROR_INVALID_SCHEMA: i32 = 2;
 }