jsonc-parser 0.18.0

use super::ast::Value as AstValue;
use super::{errors::ParseError, parse_to_ast, ParseOptions};
use serde_json::Value as SerdeValue;
use std::str::FromStr;

/// Parses a string containing JSONC to a `serde_json::Value.
///
/// Requires the "serde" cargo feature:
///
/// ```toml
/// jsonc-parser = { version = "...", features = ["serde"] }
/// ```
///
/// # Example
///
/// ```rs
/// use jsonc_parser::parse_to_serde_value;
///
/// let json_value = parse_to_serde_value(r#"{ "test": 5 } // test"#).unwrap();
/// ```
pub fn parse_to_serde_value(text: &str) -> Result<Option<SerdeValue>, ParseError> {
  let value = parse_to_ast(
    text,
    &ParseOptions {
      comments: false,
      tokens: false,
    },
  )?
  .value;
  Ok(value.map(to_serde))
}

fn to_serde(value: AstValue) -> SerdeValue {
  // originally from the Deno repo, then shaped to work here
  match value {
    AstValue::Array(arr) => {
      let vec = arr.elements.into_iter().map(to_serde).collect();
      SerdeValue::Array(vec)
    }
    AstValue::BooleanLit(bool) => SerdeValue::Bool(bool.value),
    AstValue::NullKeyword(_) => SerdeValue::Null,
    AstValue::NumberLit(num) => {
      let number = serde_json::Number::from_str(num.value).expect("could not parse number");
      SerdeValue::Number(number)
    }
    AstValue::Object(obj) => {
      let mut map = serde_json::map::Map::new();
      for prop in obj.properties.into_iter() {
        map.insert(prop.name.into_string(), to_serde(prop.value));
      }
      SerdeValue::Object(map)
    }
    AstValue::StringLit(str) => SerdeValue::String(str.value.into_owned()),
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn it_should_error_when_has_error() {
    assert_has_error(
      "[][]",
      "Text cannot contain more than one JSON value on line 1 column 3.",
    );
  }

  fn assert_has_error(text: &str, message: &str) {
    let result = parse_to_serde_value(text);
    match result {
      Ok(_) => panic!("Expected error, but did not find one."),
      Err(err) => assert_eq!(err.to_string(), message),
    }
  }

  #[test]
  fn it_should_parse_to_serde_value() {
    let result =
      parse_to_serde_value(r#"{ "a": { "a1": 5 }, "b": [0.3e+025], "c": "c1", "d": true, "e": false, "f": null }"#)
        .unwrap();

    let mut expected_value = serde_json::map::Map::new();
    expected_value.insert("a".to_string(), {
      let mut inner_obj = serde_json::map::Map::new();
      inner_obj.insert(
        "a1".to_string(),
        SerdeValue::Number(serde_json::Number::from_str("5").unwrap()),
      );
      SerdeValue::Object(inner_obj)
    });
    expected_value.insert("b".to_string(), {
      let mut inner_array = Vec::new();
      inner_array.push(SerdeValue::Number(serde_json::Number::from_str("0.3e+025").unwrap()));
      SerdeValue::Array(inner_array)
    });
    expected_value.insert("c".to_string(), SerdeValue::String("c1".to_string()));
    expected_value.insert("d".to_string(), SerdeValue::Bool(true));
    expected_value.insert("e".to_string(), SerdeValue::Bool(false));
    expected_value.insert("f".to_string(), SerdeValue::Null);

    assert_eq!(result, Some(SerdeValue::Object(expected_value)));
  }
}