rs-05-json-value

0.000

0/1 tests· architecture

Proposed solution

```rust
// src/lib.rs

use std::collections::HashMap;
use std::fmt;
use std::str::FromStr;

#[derive(Debug, Clone, PartialEq)]
pub enum Value {
    Null,
    Bool(bool),
    Number(f64),
    Str(String),
    Array(Vec<Value>),
    Object(HashMap<String, Value>),
}

#[derive(Debug, Clone, PartialEq)]
pub struct ParseError {
    message: String,
    position: usize,
}

impl ParseError {
    fn new(message: &str, position: usize) -> Self {
        ParseError {
            message: message.to_string(),
            position,
        }
    }
}

impl fmt::Display for ParseError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "ParseError at position {}: {}", self.position, self.message)
    }
}

fn parse(input: &str) -> Result<Value, ParseError> {
    let mut chars = input.chars().enumerate();
    parse_value(&mut chars)
}

fn parse_value(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {
    skip_whitespace(chars);

    match chars.next().unwrap() {
        '{' => parse_object(chars),
        '[' => parse_array(chars),
        't' => parse_bool(true, chars),
        'f' => parse_bool(false, chars),
        'n' => parse_null(chars),
        '"' => parse_str(chars),
        c if c.is_digit(10) || c == '.' || c == 'e' || c == '-' || c == '+' || c == '*' || c == '/' => parse_number(chars),
        _ => Err(ParseError::new(&format!("Unexpected character: {}", c)),
    }
}

fn parse_object(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {
    let mut object = HashMap::new();

    skip_whitespace(chars);

    if chars.next().unwrap() != '{' {
        return Err(ParseError::new("Expected '{'"));
    }

    while let Some((_, ch)) = chars.next() {
        if ch == '}' {
            break;
        }

        skip_whitespace(chars);

        if ch != '"' {
            return Err(ParseError::new("Expected '\"'"));
        }

        let key = parse_str(chars)?;

        skip_whitespace(chars);

        if chars.next().unwrap() != ':' {
            return Err(ParseError::new("Expected ':'"));
        }

        skip_whitespace(chars);

        if chars.next().unwrap() == '}' {
            return Err(ParseError::new("Unexpected '}'"));
        }

        let value = parse_value(chars)?;

        object.insert(key, value);

        skip_whitespace(chars);

        if chars.next().unwrap() == '}' {
            break;
        }

        if chars.next().unwrap() != ',' {
            return Err(ParseError::new("Expected ','"));
        }
    }

    Ok(Value::Object(object))
}

fn parse_array(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {
    let mut array = Vec::new();

    skip_whitespace(chars);

    if chars.next().unwrap() != '[' {
        return Err(ParseError::new("Expected '['"));
    }

    while let Some((_, ch)) = chars.next() {
        if ch == ']' {
            break;
        }

        skip_whitespace(chars);

        if ch == ']' {
            return Err(ParseError::new("Unexpected ']'");
        }

        let value = parse_value(chars)?;

        array.push(value);

        skip_whitespace(chars);

        if chars.next().unwrap() == ']' {
            break;
        }

        if chars.next().unwrap() != ',' {
            return Err(ParseError::new("Expected ','"));
        }
    }

    Ok(Value::Array(array))
}

fn parse_bool(value: bool, chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {
    if let Some((_, ch)) = chars.next() {
        if ch == 't' {
            if chars.next().unwrap() == 'r' {
                if chars.next().unwrap() == 'u' {
                    if chars.next().unwrap() == 'e' {
                        if chars.next().unwrap() == ' ' {
                            return Ok(Value::Bool(true));
                        }
                    }
                }
            }
        } else if ch == 'f' {
            if chars.next().unwrap() == 'a' {
                if chars.next().unwrap() == 'l' {
                    if chars.next().unwrap() == 's' {
                        if chars.next().unwrap() == 'e' {
                            return Ok(Value::Bool(false));
                        }
                    }
                }
            }
        }
    }

    Err(ParseError::new("Invalid boolean literal"))
}

fn parse_null(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {
    if let Some((_, ch)) = chars.next() {
        if ch == 'n' {
            if chars.next().unwrap() == 'u' {
                if chars.next().unwrap() == 'l' {
                    if chars.next().unwrap() == 'l' {
                        return Ok(Value::Null);
                    }
                }
            }
        }
    }

    Err(ParseError::new("Invalid null literal"))
}

fn parse_str(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {
    let mut str = String::new();

    while let Some((_, ch)) = chars.next() {
        if ch == '"' {
            break;
        }

        match ch {
            '"' => return Err(ParseError::new("Unterminated string")),
            '\\' => {
                chars.next();
                match chars.next() {
                    '"' => str.push('"'),
                    '\\' => str.push('\\'),
                    'n' => str.push('\n'),
                    't' => str.push('\t'),
                    'r' => str.push('\r'),
                    'b' => str.push('\b'),
                    'f' => str.push('\f'),
                    c if c.is_ascii_hexdigit() => {
                        let mut hex_digits = String::new();
                        for _ in 0..2 {
                            hex_digits.push(chars.next().unwrap());
                        }
                        str.push_str(&str::from_utf8_lossy(&hex_digits).to_string());
                    }
                    _ => return Err(ParseError::new("Invalid escape sequence")),
                }
            }
            _ => str.push(ch),
        }
    }

    Ok(Value::Str(str))
}

fn parse_number(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {
    let mut number = String::new();

    while let Some((_, ch)) = chars.next() {
        if ch.is_digit(10) || ch == '.' || ch == 'e' || ch == '+' || ch == '-' || ch == '*' || ch == '/' {
            number.push(ch);
        } else {
            break;
        }
    }

    if let Ok(num) = f64::from_str(&number) {
        Ok(Value::Number(num))
    } else {
        Err(ParseError::new("Invalid number"))
    }
}

fn skip_whitespace(chars: &mut std::iter::Enumerate<char>) {
    while let Some((_, ch)) = chars.next() {
        if !ch.is_whitespace() {
            break;
        }
    }
}

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

    #[test]
    fn test_parse_null() {
        let input = "null";
        assert_eq!(parse(input).unwrap(), Value::Null);
    }

    #[test]
    fn test_parse_bool_true() {
        let input = "true";
        assert_eq!(parse(input).unwrap(), Value::Bool(true));
    }

    #[test]
    fn test_parse_bool_false() {
        let input = "false";
        assert_eq!(parse(input).unwrap(), Value::Bool(false));
    }

    #[test]
    fn test_parse_number() {
        let input = "123.456";
        assert_eq!(parse(input).unwrap(), Value::Number(123.456));
    }

    #[test]
    fn test_parse_string() {
        let input = "\"Hello, world!\"";
        assert_eq!(parse(input).unwrap(), Value::Str("Hello, world!".to_string()));
    }

    #[test]
    fn test_parse_array() {
        let input = "[1, true, null, [2, 3]]";
        assert_eq!(
            parse(input).unwrap(),
            Value::Array(vec![
                Value::Number(1.0),
                Value::Bool(true),
                Value::Null,
                Value::Array(vec![Value::Number(2.0), Value::Number(3.0)]
            ])
        );
    }

    #[test]
    fn test_parse_object() {
        let input = "{\"key1\": \"value1\", \"key2\": [1, true, null]}";
        assert_eq!(
            parse(input).unwrap(),
            Value::Object(HashMap::from([
                ("key1".to_string(), Value::Str("value1".to_string())),
                ("key2".to_string(), Value::Array(vec![
                    Value::Number(1.0),
                    Value::Bool(true),
                    Value::Null
                ]))
            ]))
        );
    }

    #[test]
    fn test_parse_malformed_input() {
        let input = "invalid input";
        assert!(parse(input).is_err());
    }

    #[test]
    fn test_parse_unterminated_string() {
        let input = "\"Hello, world";
        assert!(parse(input).is_err());
    }

    #[test]
    fn test_parse_invalid_number() {
        let input = "123abc";
        assert!(parse(input).is_err());
    }

    #[test]
    fn test_parse_invalid_array() {
        let input = "[1, 2, 3";
        assert!(parse(input).is_err());
    }

    #[test]
    fn test_parse_invalid_object() {
        let input = "{key1: value1";
        assert!(parse(input).is_err());
    }
}
```

Errors (stderr)

error: unknown character escape: `b`
   --> src/lib.rs:210:39
    |
210 |                     'b' => str.push('\b'),
    |                                       ^ unknown character escape
    |
    = help: for more information, visit <https://doc.rust-lang.org/reference/tokens.html#literals>
help: if you meant to write a literal backslash (perhaps escaping in a regular expression), consider a raw string literal
    |
210 -                     'b' => str.push('\b'),
210 +                     'b' => str.push(r"\b"),
    |

error: unknown character escape: `f`
   --> src/lib.rs:211:39
    |
211 |                     'f' => str.push('\f'),
    |                                       ^ unknown character escape
    |
    = help: for more information, visit <https://doc.rust-lang.org/reference/tokens.html#literals>
help: if you meant to write a literal backslash (perhaps escaping in a regular expression), consider a raw string literal
    |
211 -                     'f' => str.push('\f'),
211 +                     'f' => str.push(r"\f"),
    |

error: mismatched closing delimiter: `}`
  --> src/lib.rs:54:17
   |
46 |     match chars.next().unwrap() {
   |                                 - closing delimiter possibly meant for this
...
54 |         _ => Err(ParseError::new(&format!("Unexpected character: {}", c)),
   |                 ^ unclosed delimiter
55 |     }
   |     ^ mismatched closing delimiter

error: mismatched closing delimiter: `}`
   --> src/lib.rs:127:23
    |
126 |         if ch == ']' {
    |                      - closing delimiter possibly meant for this
127 |             return Err(ParseError::new("Unexpected ']'");
    |                       ^ unclosed delimiter
128 |         }
    |         ^ mismatched closing delimiter

error: mismatched closing delimiter: `]`
   --> src/lib.rs:298:29
    |
294 |             Value::Array(vec![
    |                              - closing delimiter possibly meant for this
...
298 |                 Value::Array(vec![Value::Number(2.0), Value::Number(3.0)]
    |                             ^ unclosed delimiter
299 |             ])
    |             ^ mismatched closing delimiter

error: could not compile `challenge` (lib) due to 5 previous errors
error: could not compile `challenge` (lib test) due to 5 previous errors

Self-repair attempts

[
  {
    "total": 1,
    "answer": "```rust\n// src/lib.rs\n\nuse std::collections::HashMap;\nuse std::fmt;\nuse std::str::FromStr;\n\n#[derive(Debug, Clone, PartialEq)]\npub enum Value {\n    Null,\n    Bool(bool),\n    Number(f64),\n    Str(String),\n    Array(Vec<Value>),\n    Object(HashMap<String, Value>),\n}\n\n#[derive(Debug, Clone, PartialEq)]\npub struct ParseError {\n    message: String,\n    position: usize,\n}\n\nimpl ParseError {\n    fn new(message: &str, position: usize) -> Self {\n        ParseError {\n            message: message.to_string(),\n            position,\n        }\n    }\n}\n\nimpl fmt::Display for ParseError {\n    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {\n        write!(f, \"ParseError at position {}: {}\", self.position, self.message)\n    }\n}\n\nfn parse(input: &str) -> Result<Value, ParseError> {\n    let mut chars = input.chars().enumerate();\n    parse_value(&mut chars)\n}\n\nfn parse_value(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    skip_whitespace(chars);\n\n    match chars.next().unwrap() {\n        '{' => parse_object(chars),\n        '[' => parse_array(chars),\n        't' => parse_bool(true, chars),\n        'f' => parse_bool(false, chars),\n        'n' => parse_null(chars),\n        '\"' => parse_str(chars),\n        c if c.is_digit(10) || c == '.' || c == 'e' || c == '-' || c == '+' || c == '*' || c == '/' => parse_number(chars),\n        _ => Err(ParseError::new(&format!(\"Unexpected character: {}\", c)),\n    }\n}\n\nfn parse_object(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut object = HashMap::new();\n\n    skip_whitespace(chars);\n\n    if chars.next().unwrap() != '{' {\n        return Err(ParseError::new(\"Expected '{'\"));\n    }\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == '}' {\n            break;\n        }\n\n        skip_whitespace(chars);\n\n        if ch != '\"' {\n            return Err(ParseError::new(\"Expected '\\\"'\"));\n        }\n\n        let key = parse_str(chars)?;\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() != ':' {\n            return Err(ParseError::new(\"Expected ':'\"));\n        }\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == '}' {\n            return Err(ParseError::new(\"Unexpected '}'\"));\n        }\n\n        let value = parse_value(chars)?;\n\n        object.insert(key, value);\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == '}' {\n            break;\n        }\n\n        if chars.next().unwrap() != ',' {\n            return Err(ParseError::new(\"Expected ','\"));\n        }\n    }\n\n    Ok(Value::Object(object))\n}\n\nfn parse_array(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut array = Vec::new();\n\n    skip_whitespace(chars);\n\n    if chars.next().unwrap() != '[' {\n        return Err(ParseError::new(\"Expected '['\"));\n    }\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == ']' {\n            break;\n        }\n\n        skip_whitespace(chars);\n\n        if ch == ']' {\n            return Err(ParseError::new(\"Unexpected ']'\");\n        }\n\n        let value = parse_value(chars)?;\n\n        array.push(value);\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == ']' {\n            break;\n        }\n\n        if chars.next().unwrap() != ',' {\n            return Err(ParseError::new(\"Expected ','\"));\n        }\n    }\n\n    Ok(Value::Array(array))\n}\n\nfn parse_bool(value: bool, chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    if let Some((_, ch)) = chars.next() {\n        if ch == 't' {\n            if chars.next().unwrap() == 'r' {\n                if chars.next().unwrap() == 'u' {\n                    if chars.next().unwrap() == 'e' {\n                        if chars.next().unwrap() == ' ' {\n                            return Ok(Value::Bool(true));\n                        }\n                    }\n                }\n            }\n        } else if ch == 'f' {\n            if chars.next().unwrap() == 'a' {\n                if chars.next().unwrap() == 'l' {\n                    if chars.next().unwrap() == 's' {\n                        if chars.next().unwrap() == 'e' {\n                            return Ok(Value::Bool(false));\n                        }\n                    }\n                }\n            }\n        }\n    }\n\n    Err(ParseError::new(\"Invalid boolean literal\"))\n}\n\nfn parse_null(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    if let Some((_, ch)) = chars.next() {\n        if ch == 'n' {\n            if chars.next().unwrap() == 'u' {\n                if chars.next().unwrap() == 'l' {\n                    if chars.next().unwrap() == 'l' {\n                        return Ok(Value::Null);\n                    }\n                }\n            }\n        }\n    }\n\n    Err(ParseError::new(\"Invalid null literal\"))\n}\n\nfn parse_str(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut str = String::new();\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == '\"' {\n            break;\n        }\n\n        match ch {\n            '\"' => return Err(ParseError::new(\"Unterminated string\")),\n            '\\\\' => {\n                chars.next();\n                match chars.next() {\n                    '\"' => str.push('\"'),\n                    '\\\\' => str.push('\\\\'),\n                    'n' => str.push('\\n'),\n                    't' => str.push('\\t'),\n                    'r' => str.push('\\r'),\n                    'b' => str.push('\\b'),\n                    'f' => str.push('\\f'),\n                    c if c.is_ascii_hexdigit() => {\n                        let mut hex_digits = String::new();\n                        for _ in 0..2 {\n                            hex_digits.push(chars.next().unwrap());\n                        }\n                        str.push_str(&str::from_utf8_lossy(&hex_digits).to_string());\n                    }\n                    _ => return Err(ParseError::new(\"Invalid escape sequence\")),\n                }\n            }\n            _ => str.push(ch),\n        }\n    }\n\n    Ok(Value::Str(str))\n}\n\nfn parse_number(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut number = String::new();\n\n    while let Some((_, ch)) = chars.next() {\n        if ch.is_digit(10) || ch == '.' || ch == 'e' || ch == '+' || ch == '-' || ch == '*' || ch == '/' {\n            number.push(ch);\n        } else {\n            break;\n        }\n    }\n\n    if let Ok(num) = f64::from_str(&number) {\n        Ok(Value::Number(num))\n    } else {\n        Err(ParseError::new(\"Invalid number\"))\n    }\n}\n\nfn skip_whitespace(chars: &mut std::iter::Enumerate<char>) {\n    while let Some((_, ch)) = chars.next() {\n        if !ch.is_whitespace() {\n            break;\n        }\n    }\n}\n\n#[cfg(test)]\nmod tests {\n    use super::*;\n\n    #[test]\n    fn test_parse_null() {\n        let input = \"null\";\n        assert_eq!(parse(input).unwrap(), Value::Null);\n    }\n\n    #[test]\n    fn test_parse_bool_true() {\n        let input = \"true\";\n        assert_eq!(parse(input).unwrap(), Value::Bool(true));\n    }\n\n    #[test]\n    fn test_parse_bool_false() {\n        let input = \"false\";\n        assert_eq!(parse(input).unwrap(), Value::Bool(false));\n    }\n\n    #[test]\n    fn test_parse_number() {\n        let input = \"123.456\";\n        assert_eq!(parse(input).unwrap(), Value::Number(123.456));\n    }\n\n    #[test]\n    fn test_parse_string() {\n        let input = \"\\\"Hello, world!\\\"\";\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, world!\".to_string()));\n    }\n\n    #[test]\n    fn test_parse_array() {\n        let input = \"[1, true, null, [2, 3]]\";\n        assert_eq!(\n            parse(input).unwrap(),\n            Value::Array(vec![\n                Value::Number(1.0),\n                Value::Bool(true),\n                Value::Null,\n                Value::Array(vec![Value::Number(2.0), Value::Number(3.0)]\n            ])\n        );\n    }\n\n    #[test]\n    fn test_parse_object() {\n        let input = \"{\\\"key1\\\": \\\"value1\\\", \\\"key2\\\": [1, true, null]}\";\n        assert_eq!(\n            parse(input).unwrap(),\n            Value::Object(HashMap::from([\n                (\"key1\".to_string(), Value::Str(\"value1\".to_string())),\n                (\"key2\".to_string(), Value::Array(vec![\n                    Value::Number(1.0),\n                    Value::Bool(true),\n                    Value::Null\n                ]))\n            ]))\n        );\n    }\n\n    #[test]\n    fn test_parse_malformed_input() {\n        let input = \"invalid input\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_unterminated_string() {\n        let input = \"\\\"Hello, world\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_number() {\n        let input = \"123abc\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_array() {\n        let input = \"[1, 2, 3\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_object() {\n        let input = \"{key1: value1\";\n        assert!(parse(input).is_err());\n    }\n}\n```",
    "passed": 0,
    "test_error": "error: unknown character escape: `b`\n   --> src/lib.rs:210:39\n    |\n210 |                     'b' => str.push('\\b'),\n    |                                       ^ unknown character escape\n    |\n    = help: for more information, visit <https://doc.rust-lang.org/reference/tokens.html#literals>\nhelp: if you meant to write a literal backslash (perhaps escaping in a regular expression), consider a raw string literal\n    |\n210 -                     'b' => str.push('\\b'),\n210 +                     'b' => str.push(r\"\\b\"),\n    |\n\nerror: unknown character escape: `f`\n   --> src/lib.rs:211:39\n    |\n211 |                     'f' => str.push('\\f'),\n    |                                       ^ unknown character escape\n    |\n    = help: for more information, visit <https://doc.rust-lang.org/reference/tokens.html#literals>\nhelp: if you meant to write a literal backslash (perhaps escaping in a regular expression), consider a raw string literal\n    |\n211 -                     'f' => str.push('\\f'),\n211 +                     'f' => str.push(r\"\\f\"),\n    |\n\nerror: mismatched closing delimiter: `}`\n  --> src/lib.rs:54:17\n   |\n46 |     match chars.next().unwrap() {\n   |                                 - closing delimiter possibly meant for this\n...\n54 |         _ => Err(ParseError::new(&format!(\"Unexpected character: {}\", c)),\n   |                 ^ unclosed delimiter\n55 |     }\n   |     ^ mismatched closing delimiter\n\nerror: mismatched closing delimiter: `}`\n   --> src/lib.rs:127:23\n    |\n126 |         if ch == ']' {\n    |                      - closing delimiter possibly meant for this\n127 |             return Err(ParseError::new(\"Unexpected ']'\");\n    |                       ^ unclosed delimiter\n128 |         }\n    |         ^ mismatched closing delimiter\n\nerror: mismatched closing delimiter: `]`\n   --> src/lib.rs:298:29\n    |\n294 |             Value::Array(vec![\n    |                              - closing delimiter possibly meant for this\n...\n298 |                 Value::Array(vec![Value::Number(2.0), Value::Number(3.0)]\n    |                             ^ unclosed delimiter\n299 |             ])\n    |             ^ mismatched closing delimiter\n\nerror: could not compile `challenge` (lib) due to 5 previous errors\nerror: could not compile `challenge` (lib test) due to 5 previous errors"
  },
  {
    "total": 1,
    "answer": "```rust\n// src/lib.rs\n\nuse std::collections::HashMap;\nuse std::fmt;\nuse std::str::FromStr;\n\n#[derive(Debug, Clone, PartialEq)]\npub enum Value {\n    Null,\n    Bool(bool),\n    Number(f64),\n    Str(String),\n    Array(Vec<Value>),\n    Object(HashMap<String, Value>),\n}\n\n#[derive(Debug, Clone, PartialEq)]\npub struct ParseError {\n    message: String,\n    position: usize,\n}\n\nimpl ParseError {\n    fn new(message: &str, position: usize) -> Self {\n        ParseError {\n            message: message.to_string(),\n            position,\n        }\n    }\n}\n\nimpl fmt::Display for ParseError {\n    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {\n        write!(f, \"ParseError at position {}: {}\", self.position, self.message)\n    }\n}\n\nfn parse(input: &str) -> Result<Value, ParseError> {\n    let mut chars = input.chars().enumerate();\n    parse_value(chars)\n}\n\nfn parse_value(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    skip_whitespace(chars);\n\n    match chars.next().unwrap() {\n        '{' => parse_object(chars),\n        '[' => parse_array(chars),\n        't' => parse_bool(true, chars),\n        'f' => parse_bool(false, chars),\n        'n' => parse_null(chars),\n        '\"' => parse_str(chars),\n        c if c.is_digit(10) || c == '.' || c == 'e' || c == '-' || c == '+' || c == '*' || c == '/' => parse_number(chars),\n        _ => Err(ParseError::new(&format!(\"Unexpected character: {}\", c)),\n    }\n}\n\nfn parse_object(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut object = HashMap::new();\n\n    skip_whitespace(chars);\n\n    if chars.next().unwrap() != '{' {\n        return Err(ParseError::new(\"Expected '{'\"));\n    }\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == '}' {\n            break;\n        }\n\n        skip_whitespace(chars);\n\n        if ch != '\"' {\n            return Err(ParseError::new(\"Expected '\\\"'\"));\n        }\n\n        let key = parse_str(chars)?;\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() != ':' {\n            return Err(ParseError::new(\"Expected ':'\"));\n        }\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == '}' {\n            return Err(ParseError::new(\"Unexpected '}'\"));\n        }\n\n        let value = parse_value(chars)?;\n\n        object.insert(key, value);\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == '}' {\n            break;\n        }\n\n        if chars.next().unwrap() != ',' {\n            return Err(ParseError::new(\"Expected ','\"));\n        }\n    }\n\n    Ok(Value::Object(object))\n}\n\nfn parse_array(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut array = Vec::new();\n\n    skip_whitespace(chars);\n\n    if chars.next().unwrap() != '[' {\n        return Err(ParseError::new(\"Expected '['\"));\n    }\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == ']' {\n            break;\n        }\n\n        skip_whitespace(chars);\n\n        if ch == ']' {\n            return Err(ParseError::new(\"Unexpected ']'\");\n        }\n\n        let value = parse_value(chars)?;\n\n        array.push(value);\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == ']' {\n            break;\n        }\n\n        if chars.next().unwrap() != ',' {\n            return Err(ParseError::new(\"Expected ','\"));\n        }\n    }\n\n    Ok(Value::Array(array))\n}\n\nfn parse_bool(value: bool, chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    if let Some((_, ch)) = chars.next() {\n        if ch == 't' {\n            if chars.next().unwrap() == 'r' {\n                if chars.next().unwrap() == 'u' {\n                    if chars.next().unwrap() == 'e' {\n                        if chars.next().unwrap() == ' ' {\n                            return Ok(Value::Bool(true));\n                        }\n                    }\n                }\n            }\n        } else if ch == 'f' {\n            if chars.next().unwrap() == 'a' {\n                if chars.next().unwrap() == 'l' {\n                    if chars.next().unwrap() == 's' {\n                        if chars.next().unwrap() == 'e' {\n                            return Ok(Value::Bool(false));\n                        }\n                    }\n                }\n            }\n        }\n    }\n\n    Err(ParseError::new(\"Invalid boolean literal\"))\n}\n\nfn parse_null(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    if let Some((_, ch)) = chars.next() {\n        if ch == 'n' {\n            if chars.next().unwrap() == 'u' {\n                if chars.next().unwrap() == 'l' {\n                    if chars.next().unwrap() == 'l' {\n                        return Ok(Value::Null);\n                    }\n                }\n            }\n        }\n    }\n\n    Err(ParseError::new(\"Invalid null literal\"))\n}\n\nfn parse_str(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut str = String::new();\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == '\"' {\n            break;\n        }\n\n        match ch {\n            '\"' => return Err(ParseError::new(\"Unterminated string\")),\n            '\\\\' => {\n                chars.next();\n                match chars.next() {\n                    '\"' => str.push('\"'),\n                    '\\\\' => str.push('\\\\'),\n                    'n' => str.push('\\n'),\n                    't' => str.push('\\t'),\n                    'r' => str.push('\\r'),\n                    'b' => str.push('\\b'),\n                    'f' => str.push('\\f'),\n                    c if c.is_ascii_hexdigit() => {\n                        let mut hex_digits = String::new();\n                        for _ in 0..2 {\n                            hex_digits.push(chars.next().unwrap());\n                        }\n                        str.push_str(&str::from_utf8_lossy(&hex_digits).to_string());\n                    }\n                    _ => return Err(ParseError::new(\"Invalid escape sequence\")),\n                }\n            }\n            _ => str.push(ch),\n        }\n    }\n\n    Ok(Value::Str(str))\n}\n\nfn parse_number(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut number = String::new();\n\n    while let Some((_, ch)) = chars.next() {\n        if ch.is_digit(10) || ch == '.' || ch == 'e' || ch == '+' || ch == '-' || ch == '*' || ch == '/' {\n            number.push(ch);\n        } else {\n            break;\n        }\n    }\n\n    if let Ok(num) = f64::from_str(&number) {\n        Ok(Value::Number(num))\n    } else {\n        Err(ParseError::new(\"Invalid number\"))\n    }\n}\n\nfn skip_whitespace(chars: &mut std::iter::Enumerate<char>) {\n    while let Some((_, ch)) = chars.next() {\n        if !ch.is_whitespace() {\n            break;\n        }\n    }\n}\n\n#[cfg(test)]\nmod tests {\n    use super::*;\n\n    #[test]\n    fn test_parse_null() {\n        let input = \"null\";\n        assert_eq!(parse(input).unwrap(), Value::Null);\n    }\n\n    #[test]\n    fn test_parse_bool_true() {\n        let input = \"true\";\n        assert_eq!(parse(input).unwrap(), Value::Bool(true));\n    }\n\n    #[test]\n    fn test_parse_bool_false() {\n        let input = \"false\";\n        assert_eq!(parse(input).unwrap(), Value::Bool(false));\n    }\n\n    #[test]\n    fn test_parse_number() {\n        let input = \"123.456\";\n        assert_eq!(parse(input).unwrap(), Value::Number(123.456));\n    }\n\n    #[test]\n    fn test_parse_string() {\n        let input = \"\\\"Hello, world!\\\"\";\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, world!\".to_string()));\n    }\n\n    #[test]\n    fn test_parse_array() {\n        let input = \"[1, true, null, [2, 3]]\";\n        assert_eq!(\n            parse(input).unwrap(),\n            Value::Array(vec![\n                Value::Number(1.0),\n                Value::Bool(true),\n                Value::Null,\n                Value::Array(vec![Value::Number(2.0), Value::Number(3.0)]\n            ])\n        );\n    }\n\n    #[test]\n    fn test_parse_object() {\n        let input = \"{\\\"key1\\\": \\\"value1\\\", \\\"key2\\\": [1, true, null]}\";\n        assert_eq!(\n            parse(input).unwrap(),\n            Value::Object(HashMap::from([\n                (\"key1\".to_string(), Value::Str(\"value1\".to_string())),\n                (\"key2\".to_string(), Value::Array(vec![\n                    Value::Number(1.0),\n                    Value::Bool(true),\n                    Value::Null\n                ]))\n            ]))\n        );\n    }\n\n    #[test]\n    fn test_parse_malformed_input() {\n        let input = \"invalid input\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_unterminated_string() {\n        let input = \"\\\"Hello, world\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_number() {\n        let input = \"123abc\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_array() {\n        let input = \"[1, 2, 3\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_object() {\n        let input = \"{key1: value1\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_backspace() {\n        let input = \"\\\"Hello, \\bworld\\\"\";\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, world\".to_string()));\n    }\n\n    #[test]\n    fn test_parse_hex_escape() {\n        let input = \"\\\"Hello, \\\\u0041\\\"\";\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, A\".to_string()));\n    }\n}\n```",
    "passed": 0,
    "test_error": ": if you meant to write a literal backslash (perhaps escaping in a regular expression), consider a raw string literal\n    |\n210 -                     'b' => str.push('\\b'),\n210 +                     'b' => str.push(r\"\\b\"),\n    |\n\nerror: unknown character escape: `f`\n   --> src/lib.rs:211:39\n    |\n211 |                     'f' => str.push('\\f'),\n    |                                       ^ unknown character escape\n    |\n    = help: for more information, visit <https://doc.rust-lang.org/reference/tokens.html#literals>\nhelp: if you meant to write a literal backslash (perhaps escaping in a regular expression), consider a raw string literal\n    |\n211 -                     'f' => str.push('\\f'),\n211 +                     'f' => str.push(r\"\\f\"),\n    |\n\nerror: unknown character escape: `b`\n   --> src/lib.rs:351:32\n    |\n351 |         let input = \"\\\"Hello, \\bworld\\\"\";\n    |                                ^ unknown character escape\n    |\n    = help: for more information, visit <https://doc.rust-lang.org/reference/tokens.html#literals>\nhelp: if you meant to write a literal backslash (perhaps escaping in a regular expression), consider a raw string literal\n    |\n351 |         let input = r\"\\\"Hello, \\bworld\\\"\";\n    |                     +\n\nerror: mismatched closing delimiter: `}`\n  --> src/lib.rs:54:17\n   |\n46 |     match chars.next().unwrap() {\n   |                                 - closing delimiter possibly meant for this\n...\n54 |         _ => Err(ParseError::new(&format!(\"Unexpected character: {}\", c)),\n   |                 ^ unclosed delimiter\n55 |     }\n   |     ^ mismatched closing delimiter\n\nerror: mismatched closing delimiter: `}`\n   --> src/lib.rs:127:23\n    |\n126 |         if ch == ']' {\n    |                      - closing delimiter possibly meant for this\n127 |             return Err(ParseError::new(\"Unexpected ']'\");\n    |                       ^ unclosed delimiter\n128 |         }\n    |         ^ mismatched closing delimiter\n\nerror: mismatched closing delimiter: `]`\n   --> src/lib.rs:298:29\n    |\n294 |             Value::Array(vec![\n    |                              - closing delimiter possibly meant for this\n...\n298 |                 Value::Array(vec![Value::Number(2.0), Value::Number(3.0)]\n    |                             ^ unclosed delimiter\n299 |             ])\n    |             ^ mismatched closing delimiter\n\nerror: could not compile `challenge` (lib test) due to 6 previous errors\nerror: could not compile `challenge` (lib) due to 6 previous errors"
  },
  {
    "total": 1,
    "answer": "```rust\n// src/lib.rs\n\nuse std::collections::HashMap;\nuse std::fmt;\nuse std::str::FromStr;\n\n#[derive(Debug, Clone, PartialEq)]\npub enum Value {\n    Null,\n    Bool(bool),\n    Number(f64),\n    Str(String),\n    Array(Vec<Value>),\n    Object(HashMap<String, Value>),\n}\n\n#[derive(Debug, Clone, PartialEq)]\npub struct ParseError {\n    message: String,\n    position: usize,\n}\n\nimpl ParseError {\n    fn new(message: &str, position: usize) -> Self {\n        ParseError {\n            message: message.to_string(),\n            position,\n        }\n    }\n}\n\nimpl fmt::Display for ParseError {\n    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {\n        write!(f, \"ParseError at position {}: {}\", self.position, self.message)\n    }\n}\n\nfn parse(input: &str) -> Result<Value, ParseError> {\n    let mut chars = input.chars().enumerate();\n    parse_value(chars)\n}\n\nfn parse_value(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    skip_whitespace(chars);\n\n    match chars.next().unwrap() {\n        '{' => parse_object(chars),\n        '[' => parse_array(chars),\n        't' => parse_bool(true, chars),\n        'f' => parse_bool(false, chars),\n        'n' => parse_null(chars),\n        '\"' => parse_str(chars),\n        c if c.is_digit(10) || c == '.' || c == 'e' || c == '-' || c == '+' || c == '*' || c == '/' => parse_number(chars),\n        _ => Err(ParseError::new(&format!(\"Unexpected character: {}\", c)),\n    }\n}\n\nfn parse_object(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut object = HashMap::new();\n\n    skip_whitespace(chars);\n\n    if chars.next().unwrap() != '{' {\n        return Err(ParseError::new(\"Expected '{'\"));\n    }\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == '}' {\n            break;\n        }\n\n        skip_whitespace(chars);\n\n        if ch != '\"' {\n            return Err(ParseError::new(\"Expected '\\\"'\"));\n        }\n\n        let key = parse_str(chars)?;\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() != ':' {\n            return Err(ParseError::new(\"Expected ':'\"));\n        }\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == '}' {\n            return Err(ParseError::new(\"Unexpected '}'\"));\n        }\n\n        let value = parse_value(chars)?;\n\n        object.insert(key, value);\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == '}' {\n            break;\n        }\n\n        if chars.next().unwrap() != ',' {\n            return Err(ParseError::new(\"Expected ','\"));\n        }\n    }\n\n    Ok(Value::Object(object))\n}\n\nfn parse_array(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut array = Vec::new();\n\n    skip_whitespace(chars);\n\n    if chars.next().unwrap() != '[' {\n        return Err(ParseError::new(\"Expected '['\"));\n    }\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == ']' {\n            break;\n        }\n\n        skip_whitespace(chars);\n\n        if ch == ']' {\n            return Err(ParseError::new(\"Unexpected ']'\");\n        }\n\n        let value = parse_value(chars)?;\n\n        array.push(value);\n\n        skip_whitespace(chars);\n\n        if chars.next().unwrap() == ']' {\n            break;\n        }\n\n        if chars.next().unwrap() != ',' {\n            return Err(ParseError::new(\"Expected ','\"));\n        }\n    }\n\n    Ok(Value::Array(array))\n}\n\nfn parse_bool(value: bool, chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    if let Some((_, ch)) = chars.next() {\n        if ch == 't' {\n            if chars.next().unwrap() == 'r' {\n                if chars.next().unwrap() == 'u' {\n                    if chars.next().unwrap() == 'e' {\n                        if chars.next().unwrap() == ' ' {\n                            return Ok(Value::Bool(true));\n                        }\n                    }\n                }\n            }\n        } else if ch == 'f' {\n            if chars.next().unwrap() == 'a' {\n                if chars.next().unwrap() == 'l' {\n                    if chars.next().unwrap() == 's' {\n                        if chars.next().unwrap() == 'e' {\n                            return Ok(Value::Bool(false));\n                        }\n                    }\n                }\n            }\n        }\n    }\n\n    Err(ParseError::new(\"Invalid boolean literal\"))\n}\n\nfn parse_null(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    if let Some((_, ch)) = chars.next() {\n        if ch == 'n' {\n            if chars.next().unwrap() == 'u' {\n                if chars.next().unwrap() == 'l' {\n                    if chars.next().unwrap() == 'l' {\n                        return Ok(Value::Null);\n                    }\n                }\n            }\n        }\n    }\n\n    Err(ParseError::new(\"Invalid null literal\"))\n}\n\nfn parse_str(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut str = String::new();\n\n    while let Some((_, ch)) = chars.next() {\n        if ch == '\"' {\n            break;\n        }\n\n        match ch {\n            '\"' => return Err(ParseError::new(\"Unterminated string\")),\n            '\\\\' => {\n                chars.next();\n                match chars.next() {\n                    '\"' => str.push('\"'),\n                    '\\\\' => str.push('\\\\'),\n                    'n' => str.push('\\n'),\n                    't' => str.push('\\t'),\n                    'r' => str.push('\\r'),\n                    'b' => str.push('\\b'),\n                    'f' => str.push('\\f'),\n                    c if c.is_ascii_hexdigit() => {\n                        let mut hex_digits = String::new();\n                        for _ in 0..2 {\n                            hex_digits.push(chars.next().unwrap());\n                        }\n                        str.push_str(&str::from_utf8_lossy(&hex_digits).to_string());\n                    }\n                    _ => return Err(ParseError::new(\"Invalid escape sequence\")),\n                }\n            }\n            _ => str.push(ch),\n        }\n    }\n\n    Ok(Value::Str(str))\n}\n\nfn parse_number(chars: &mut std::iter::Enumerate<char>) -> Result<Value, ParseError> {\n    let mut number = String::new();\n\n    while let Some((_, ch)) = chars.next() {\n        if ch.is_digit(10) || ch == '.' || ch == 'e' || ch == '+' || ch == '-' || ch == '*' || ch == '/' {\n            number.push(ch);\n        } else {\n            break;\n        }\n    }\n\n    if let Ok(num) = f64::from_str(&number) {\n        Ok(Value::Number(num))\n    } else {\n        Err(ParseError::new(\"Invalid number\"))\n    }\n}\n\nfn skip_whitespace(chars: &mut std::iter::Enumerate<char>) {\n    while let Some((_, ch)) = chars.next() {\n        if !ch.is_whitespace() {\n            break;\n        }\n    }\n}\n\n#[cfg(test)]\nmod tests {\n    use super::*;\n\n    #[test]\n    fn test_parse_null() {\n        let input = \"null\";\n        assert_eq!(parse(input).unwrap(), Value::Null);\n    }\n\n    #[test]\n    fn test_parse_bool_true() {\n        let input = \"true\";\n        assert_eq!(parse(input).unwrap(), Value::Bool(true));\n    }\n\n    #[test]\n    fn test_parse_bool_false() {\n        let input = \"false\";\n        assert_eq!(parse(input).unwrap(), Value::Bool(false));\n    }\n\n    #[test]\n    fn test_parse_number() {\n        let input = \"123.456\";\n        assert_eq!(parse(input).unwrap(), Value::Number(123.456));\n    }\n\n    #[test]\n    fn test_parse_string() {\n        let input = \"\\\"Hello, world!\\\"\";\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, world!\".to_string()));\n    }\n\n    #[test]\n    fn test_parse_array() {\n        let input = \"[1, true, null, [2, 3]]\";\n        assert_eq!(\n            parse(input).unwrap(),\n            Value::Array(vec![\n                Value::Number(1.0),\n                Value::Bool(true),\n                Value::Null,\n                Value::Array(vec![Value::Number(2.0), Value::Number(3.0)]\n            ])\n        );\n    }\n\n    #[test]\n    fn test_parse_object() {\n        let input = \"{\\\"key1\\\": \\\"value1\\\", \\\"key2\\\": [1, true, null]}\";\n        assert_eq!(\n            parse(input).unwrap(),\n            Value::Object(HashMap::from([\n                (\"key1\".to_string(), Value::Str(\"value1\".to_string())),\n                (\"key2\".to_string(), Value::Array(vec![\n                    Value::Number(1.0),\n                    Value::Bool(true),\n                    Value::Null\n                ]))\n            ]))\n        );\n    }\n\n    #[test]\n    fn test_parse_malformed_input() {\n        let input = \"invalid input\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_unterminated_string() {\n        let input = \"\\\"Hello, world\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_number() {\n        let input = \"123abc\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_array() {\n        let input = \"[1, 2, 3\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_invalid_object() {\n        let input = \"{key1: value1\";\n        assert!(parse(input).is_err());\n    }\n\n    #[test]\n    fn test_parse_backspace() {\n        let input = \"\\\"Hello, \\bworld\\\"\";\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, world\".to_string()));\n    }\n\n    #[test]\n    fn test_parse_hex_escape() {\n        let input = \"\\\"Hello, \\\\u0041\\\"\";\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, A\".to_string()));\n    }\n\n    #[test]\n    fn test_parse_raw_string() {\n        let input = r#\"\\\"Hello, \\bworld\\\"\"#;\n        assert_eq!(parse(input).unwrap(), Value::Str(\"Hello, world\".to_string()));\n    }\n}\n```",
    "passed": 0,
    "test_error": ""
  }
]

System prompt

You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.