rusty-jvm 0.5.0

An implementation of a Java Virtual Machine (JVM).
Documentation 
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use indexmap::IndexMap;
use rusty_jvm::Arguments;

/// Converts a vector of raw command-line arguments into an `Arguments`.
pub fn into_args(raw_args: Vec<String>) -> Arguments {
    let mut java_standard_options = Vec::new();
    let mut java_launcher_options = Vec::new();
    let mut system_properties = IndexMap::new();
    let mut jvm_options = Vec::new();
    let mut advanced_jvm_options = Vec::new();
    let mut entry_point = String::new();
    let mut program_args = Vec::new();

    let mut iter = raw_args.into_iter().peekable();
    while let Some(arg) = iter.next() {
        if arg.starts_with('-') {
            if arg.starts_with("-XX:") {
                advanced_jvm_options.push(arg);
            } else if arg.starts_with("-X") {
                jvm_options.push(arg);
            } else if arg.starts_with("-D") {
                let trimmed = &arg[2..];
                let (key, value) = match trimmed.split_once('=') {
                    Some((key, value)) => (key, value),
                    None => (trimmed, ""),
                };
                system_properties.insert(key.to_string(), value.to_string());
            } else if arg.starts_with("--") {
                java_launcher_options.push(arg);
            } else {
                java_standard_options.push(arg);
            }
        } else {
            entry_point = arg;
            break;
        }
    }

    program_args.extend(iter);

    Arguments::new(
        entry_point,
        program_args,
        java_standard_options,
        java_launcher_options,
        system_properties,
        jvm_options,
        advanced_jvm_options,
    )
}

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

    #[test]
    fn test_all_args() {
        let raw_args = vec![
            "-version".to_string(),
            "--launcher-option".to_string(),
            "-Dproperty1=value1".to_string(),
            "-Dproperty2=value2".to_string(),
            "-Xmx1024m".to_string(),
            "-XX:+UseG1GC".to_string(),
            "MainClass".to_string(),
            "arg1".to_string(),
            "arg2".to_string(),
        ];

        let parsed: Arguments = into_args(raw_args);
        let expected = Arguments::new(
            "MainClass".to_string(),
            vec!["arg1".to_string(), "arg2".to_string()],
            vec!["-version".to_string()],
            vec!["--launcher-option".to_string()],
            IndexMap::from([
                ("property1".to_string(), "value1".to_string()),
                ("property2".to_string(), "value2".to_string()),
            ]),
            vec!["-Xmx1024m".to_string()],
            vec!["-XX:+UseG1GC".to_string()],
        );

        assert_eq!(parsed, expected);
    }

    #[test]
    fn test_no_entry_point() {
        let raw_args = vec![
            "-version".to_string(),
            "--launcher-option".to_string(),
            "-Dproperty=value".to_string(),
            "-Xmx1024m".to_string(),
            "-XX:+UseG1GC".to_string(),
        ];

        let parsed: Arguments = into_args(raw_args);
        let expected = Arguments::new(
            "".to_string(),
            vec![],
            vec!["-version".to_string()],
            vec!["--launcher-option".to_string()],
            IndexMap::from([("property".to_string(), "value".to_string())]),
            vec!["-Xmx1024m".to_string()],
            vec!["-XX:+UseG1GC".to_string()],
        );
        assert_eq!(parsed, expected);
    }

    #[test]
    fn test_empty_args() {
        let parsed: Arguments = into_args(vec![]);
        let expected = Arguments::new(
            "".to_string(),
            vec![],
            vec![],
            vec![],
            IndexMap::new(),
            vec![],
            vec![],
        );
        assert_eq!(parsed, expected);
    }
}