Add google-clis-common crate

google-clis-common/Cargo.toml

@@ -0,0 +1,21 @@
+# DO NOT PUBLISH
+# This library is just to try out the code that should ultimately go into the code generator !
+[package]
+name = "google-clis-common"
+version = "4.0.0"
+authors = ["Sebastian Thiel <byronimo@gmail.com>"]
+repository = "https://github.com/Byron/google-apis-rs"
+homepage = "https://github.com/Byron/google-apis-rs/google-clis-common"
+documentation = "https://docs.rs/google-clis-common"
+description = "Shared functionality among the google-api crates."
+license = "MIT"
+keywords = ["google", "web", "api", "cli", "common"]
+edition = "2021"
+
+[dependencies]
+mime = "0.2"
+yup-oauth2 = "^ 7.0"
+serde = "1"
+serde_json = "1"
+strsim = "*"
+clap = "2"

google-clis-common/src/lib.rs

@@ -0,0 +1,790 @@
+use mime::Mime;
+use yup_oauth2::{ApplicationSecret, ConsoleApplicationSecret};
+use serde_json as json;
+use serde_json::value::Value;
+use clap::arg_enum;
+
+use std::env;
+use std::fmt;
+use std::fs;
+use std::io;
+use std::io::{stdout, Write};
+use std::path::Path;
+use std::str::FromStr;
+use std::string::ToString;
+
+use std::default::Default;
+
+const FIELD_SEP: char = '.';
+
+pub enum ComplexType {
+    Pod,
+    Vec,
+    Map,
+}
+
+// Null,
+// Bool(bool),
+// I64(i64),
+// U64(u64),
+// F64(f64),
+// String(String),
+
+pub enum JsonType {
+    Boolean,
+    Int,
+    Uint,
+    Float,
+    String,
+}
+
+pub struct JsonTypeInfo {
+    pub jtype: JsonType,
+    pub ctype: ComplexType,
+}
+
+// Based on @erickt user comment. Thanks for the idea !
+// Remove all keys whose values are null from given value (changed in place)
+pub fn remove_json_null_values(value: &mut Value) {
+    match *value {
+        Value::Object(ref mut map) => {
+            let mut for_removal = Vec::new();
+
+            for (key, mut value) in map.iter_mut() {
+                if value.is_null() {
+                    for_removal.push(key.clone());
+                } else {
+                    remove_json_null_values(&mut value);
+                }
+            }
+
+            for key in &for_removal {
+                map.remove(key);
+            }
+        }
+        json::value::Value::Array(ref mut arr) => {
+            let mut i = 0;
+            while i < arr.len() {
+                if arr[i].is_null() {
+                    arr.remove(i);
+                } else {
+                    remove_json_null_values(&mut arr[i]);
+                    i += 1;
+                }
+            }
+        }
+        _ => {}
+    }
+}
+
+fn did_you_mean<'a>(v: &str, possible_values: &[&'a str]) -> Option<&'a str> {
+    let mut candidate: Option<(f64, &str)> = None;
+    for pv in possible_values {
+        let confidence = strsim::jaro_winkler(v, pv);
+        if confidence > 0.8 && (candidate.is_none() || (candidate.as_ref().unwrap().0 < confidence))
+        {
+            candidate = Some((confidence, pv));
+        }
+    }
+    match candidate {
+        None => None,
+        Some((_, candidate)) => Some(candidate),
+    }
+}
+
+pub enum CallType {
+    Upload(UploadProtocol),
+    Standard,
+}
+
+arg_enum! {
+    pub enum UploadProtocol {
+        Simple,
+        // Resumable // This seems to be lost during the async conversion
+    }
+}
+
+impl AsRef<str> for UploadProtocol {
+    fn as_ref(&self) -> &str {
+        match *self {
+            UploadProtocol::Simple => "simple",
+            // UploadProtocol::Resumable => "resumable",
+        }
+    }
+}
+
+impl AsRef<str> for CallType {
+    fn as_ref(&self) -> &str {
+        match *self {
+            CallType::Upload(ref proto) => proto.as_ref(),
+            CallType::Standard => "standard-request",
+        }
+    }
+}
+
+#[derive(Clone, Default)]
+pub struct FieldCursor(Vec<String>);
+
+impl ToString for FieldCursor {
+    fn to_string(&self) -> String {
+        self.0.join(".")
+    }
+}
+
+impl From<&'static str> for FieldCursor {
+    fn from(value: &'static str) -> FieldCursor {
+        let mut res = FieldCursor::default();
+        res.set(value).unwrap();
+        res
+    }
+}
+
+fn assure_entry<'a>(m: &'a mut json::Map<String, Value>, k: &str) -> &'a mut Value {
+    if m.contains_key(k) {
+        return m.get_mut(k).expect("value to exist");
+    }
+    m.insert(k.to_owned(), Value::Object(Default::default()));
+    m.get_mut(k).expect("value to exist")
+}
+
+impl FieldCursor {
+    pub fn set(&mut self, value: &str) -> Result<(), CLIError> {
+        if value.is_empty() {
+            return Err(CLIError::Field(FieldError::Empty));
+        }
+
+        let mut first_is_field_sep = false;
+        let mut char_count: usize = 0;
+        let mut last_c = FIELD_SEP;
+        let mut num_conscutive_field_seps = 0;
+
+        let mut field = String::new();
+        let mut fields = self.0.clone();
+
+        let push_field = |fs: &mut Vec<String>, f: &mut String| {
+            if !f.is_empty() {
+                fs.push(f.clone());
+                f.truncate(0);
+            }
+        };
+
+        for (cid, c) in value.chars().enumerate() {
+            char_count += 1;
+
+            if c == FIELD_SEP {
+                if cid == 0 {
+                    first_is_field_sep = true;
+                }
+                num_conscutive_field_seps += 1;
+                if cid > 0 && last_c == FIELD_SEP {
+                    if fields.pop().is_none() {
+                        return Err(CLIError::Field(FieldError::PopOnEmpty(value.to_string())));
+                    }
+                } else {
+                    push_field(&mut fields, &mut field);
+                }
+            } else {
+                num_conscutive_field_seps = 0;
+                if cid == 1 && first_is_field_sep {
+                    fields.truncate(0);
+                }
+                field.push(c);
+            }
+
+            last_c = c;
+        }
+
+        push_field(&mut fields, &mut field);
+
+        if char_count == 1 && first_is_field_sep {
+            fields.truncate(0);
+        }
+        if char_count > 1 && num_conscutive_field_seps == 1 {
+            return Err(CLIError::Field(FieldError::TrailingFieldSep(
+                value.to_string(),
+            )));
+        }
+
+        self.0 = fields;
+        Ok(())
+    }
+
+    pub fn did_you_mean(value: &str, possible_values: &[&str]) -> Option<String> {
+        if value.is_empty() {
+            return None;
+        }
+
+        let mut last_c = FIELD_SEP;
+
+        let mut field = String::new();
+        let mut output = String::new();
+
+        let push_field = |fs: &mut String, f: &mut String| {
+            if !f.is_empty() {
+                fs.push_str(match did_you_mean(&f, possible_values) {
+                    Some(candidate) => candidate,
+                    None => &f,
+                });
+                f.truncate(0);
+            }
+        };
+
+        for c in value.chars() {
+            if c == FIELD_SEP {
+                if last_c != FIELD_SEP {
+                    push_field(&mut output, &mut field);
+                }
+                output.push(c);
+            } else {
+                field.push(c);
+            }
+
+            last_c = c;
+        }
+
+        push_field(&mut output, &mut field);
+
+        if output == value {
+            None
+        } else {
+            Some(output)
+        }
+    }
+
+    pub fn set_json_value(
+        &self,
+        mut object: &mut Value,
+        value: &str,
+        type_info: JsonTypeInfo,
+        err: &mut InvalidOptionsError,
+        orig_cursor: &FieldCursor,
+    ) {
+        assert!(!self.0.is_empty());
+
+        for field in &self.0[..self.0.len() - 1] {
+            let tmp = object;
+            object = match *tmp {
+                Value::Object(ref mut mapping) => assure_entry(mapping, &field),
+                _ => panic!("We don't expect non-object Values here ..."),
+            };
+        }
+
+        match *object {
+            Value::Object(ref mut mapping) => {
+                let field = &self.0[self.0.len() - 1];
+                let to_jval =
+                    |value: &str, jtype: JsonType, err: &mut InvalidOptionsError| -> Value {
+                        match jtype {
+                            JsonType::Boolean => {
+                                Value::Bool(arg_from_str(value, err, &field, "boolean"))
+                            }
+                            JsonType::Int => Value::Number(
+                                json::Number::from_f64(arg_from_str(value, err, &field, "int"))
+                                    .expect("valid f64"),
+                            ),
+                            JsonType::Uint => Value::Number(
+                                json::Number::from_f64(arg_from_str(value, err, &field, "uint"))
+                                    .expect("valid f64"),
+                            ),
+                            JsonType::Float => Value::Number(
+                                json::Number::from_f64(arg_from_str(value, err, &field, "float"))
+                                    .expect("valid f64"),
+                            ),
+                            JsonType::String => Value::String(value.to_owned()),
+                        }
+                    };
+
+                match type_info.ctype {
+                    ComplexType::Pod => {
+                        if mapping
+                            .insert(field.to_owned(), to_jval(value, type_info.jtype, err))
+                            .is_some()
+                        {
+                            err.issues.push(CLIError::Field(FieldError::Duplicate(
+                                orig_cursor.to_string(),
+                            )));
+                        }
+                    }
+                    ComplexType::Vec => match *assure_entry(mapping, field) {
+                        Value::Array(ref mut values) => {
+                            values.push(to_jval(value, type_info.jtype, err))
+                        }
+                        _ => unreachable!(),
+                    },
+                    ComplexType::Map => {
+                        let (key, value) = parse_kv_arg(value, err, true);
+                        let jval = to_jval(value.unwrap_or(""), type_info.jtype, err);
+
+                        match *assure_entry(mapping, &field) {
+                            Value::Object(ref mut value_map) => {
+                                if value_map.insert(key.to_owned(), jval).is_some() {
+                                    err.issues.push(CLIError::Field(FieldError::Duplicate(
+                                        orig_cursor.to_string(),
+                                    )));
+                                }
+                            }
+                            _ => unreachable!(),
+                        }
+                    }
+                }
+            }
+            _ => unreachable!(),
+        }
+    }
+
+    pub fn num_fields(&self) -> usize {
+        self.0.len()
+    }
+}
+
+pub fn parse_kv_arg<'a>(
+    kv: &'a str,
+    err: &mut InvalidOptionsError,
+    for_hashmap: bool,
+) -> (&'a str, Option<&'a str>) {
+    let mut add_err = || {
+        err.issues
+            .push(CLIError::InvalidKeyValueSyntax(kv.to_string(), for_hashmap))
+    };
+    match kv.find('=') {
+        None => {
+            add_err();
+            (kv, None)
+        }
+        Some(pos) => {
+            let key = &kv[..pos];
+            if kv.len() <= pos + 1 {
+                add_err();
+                return (key, Some(""));
+            }
+            (key, Some(&kv[pos + 1..]))
+        }
+    }
+}
+
+pub fn calltype_from_str(
+    name: &str,
+    valid_protocols: Vec<String>,
+    err: &mut InvalidOptionsError,
+) -> CallType {
+    CallType::Upload(match UploadProtocol::from_str(name) {
+        Ok(up) => up,
+        Err(_msg) => {
+            err.issues.push(CLIError::InvalidUploadProtocol(
+                name.to_string(),
+                valid_protocols,
+            ));
+            UploadProtocol::Simple
+        }
+    })
+}
+
+pub fn input_file_from_opts(file_path: &str, err: &mut InvalidOptionsError) -> Option<fs::File> {
+    match fs::File::open(file_path) {
+        Ok(f) => Some(f),
+        Err(io_err) => {
+            err.issues.push(CLIError::Input(InputError::Io((
+                file_path.to_string(),
+                io_err,
+            ))));
+            None
+        }
+    }
+}
+
+pub fn input_mime_from_opts(mime: &str, err: &mut InvalidOptionsError) -> Option<Mime> {
+    match mime.parse() {
+        Ok(m) => Some(m),
+        Err(_) => {
+            err.issues
+                .push(CLIError::Input(InputError::Mime(mime.to_string())));
+            None
+        }
+    }
+}
+
+pub fn writer_from_opts(arg: Option<&str>) -> Result<Box<dyn Write>, io::Error> {
+    let f = arg.unwrap_or("-");
+    match f {
+        "-" => Ok(Box::new(stdout())),
+        _ => match fs::OpenOptions::new()
+            .create(true)
+            .truncate(true)
+            .write(true)
+            .open(f)
+        {
+            Ok(f) => Ok(Box::new(f)),
+            Err(io_err) => Err(io_err),
+        },
+    }
+}
+
+pub fn arg_from_str<'a, T>(
+    arg: &str,
+    err: &mut InvalidOptionsError,
+    arg_name: &'a str,
+    arg_type: &'a str,
+) -> T
+where
+    T: FromStr + Default,
+    <T as FromStr>::Err: fmt::Display,
+{
+    match FromStr::from_str(arg) {
+        Err(perr) => {
+            err.issues.push(CLIError::ParseError(
+                arg_name.to_owned(),
+                arg_type.to_owned(),
+                arg.to_string(),
+                format!("{}", perr),
+            ));
+            Default::default()
+        }
+        Ok(v) => v,
+    }
+}
+
+#[derive(Debug)]
+pub enum ApplicationSecretError {
+    DecoderError((String, json::Error)),
+    FormatError(String),
+}
+
+impl fmt::Display for ApplicationSecretError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        match *self {
+            ApplicationSecretError::DecoderError((ref path, ref err)) => writeln!(
+                f,
+                "Could not decode file at '{}' with error: {}.",
+                path, err
+            ),
+            ApplicationSecretError::FormatError(ref path) => writeln!(
+                f,
+                "'installed' field is unset in secret file at '{}'.",
+                path
+            ),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum ConfigurationError {
+    DirectoryCreationFailed((String, io::Error)),
+    DirectoryUnset,
+    HomeExpansionFailed(String),
+    Secret(ApplicationSecretError),
+    Io((String, io::Error)),
+}
+
+impl fmt::Display for ConfigurationError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        match *self {
+            ConfigurationError::DirectoryCreationFailed((ref dir, ref err)) => writeln!(
+                f,
+                "Directory '{}' could not be created with error: {}.",
+                dir, err
+            ),
+            ConfigurationError::DirectoryUnset => writeln!(f, "--config-dir was unset or empty."),
+            ConfigurationError::HomeExpansionFailed(ref dir) => writeln!(
+                f,
+                "Couldn't find HOME directory of current user, failed to expand '{}'.",
+                dir
+            ),
+            ConfigurationError::Secret(ref err) => writeln!(f, "Secret -> {}", err),
+            ConfigurationError::Io((ref path, ref err)) => writeln!(
+                f,
+                "IO operation failed on path '{}' with error: {}.",
+                path, err
+            ),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum InputError {
+    Io((String, io::Error)),
+    Mime(String),
+}
+
+impl fmt::Display for InputError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        match *self {
+            InputError::Io((ref file_path, ref io_err)) => writeln!(
+                f,
+                "Failed to open '{}' for reading with error: {}.",
+                file_path, io_err
+            ),
+            InputError::Mime(ref mime) => writeln!(f, "'{}' is not a known mime-type.", mime),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum FieldError {
+    PopOnEmpty(String),
+    TrailingFieldSep(String),
+    Unknown(String, Option<String>, Option<String>),
+    Duplicate(String),
+    Empty,
+}
+
+impl fmt::Display for FieldError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        match *self {
+            FieldError::PopOnEmpty(ref field) => {
+                writeln!(f, "'{}': Cannot move up on empty field cursor.", field)
+            }
+            FieldError::TrailingFieldSep(ref field) => writeln!(
+                f,
+                "'{}': Single field separator may not be last character.",
+                field
+            ),
+            FieldError::Unknown(ref field, ref suggestion, ref value) => {
+                let suffix = match *suggestion {
+                    Some(ref s) => {
+                        let kv = match *value {
+                            Some(ref v) => format!("{}={}", s, v),
+                            None => s.clone(),
+                        };
+                        format!(" Did you mean '{}' ?", kv)
+                    }
+                    None => String::new(),
+                };
+                writeln!(f, "Field '{}' does not exist.{}", field, suffix)
+            }
+            FieldError::Duplicate(ref cursor) => {
+                writeln!(f, "Value at '{}' was already set", cursor)
+            }
+            FieldError::Empty => writeln!(f, "Field names must not be empty."),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum CLIError {
+    Configuration(ConfigurationError),
+    ParseError(String, String, String, String),
+    UnknownParameter(String, Vec<&'static str>),
+    InvalidUploadProtocol(String, Vec<String>),
+    InvalidKeyValueSyntax(String, bool),
+    Input(InputError),
+    Field(FieldError),
+    MissingCommandError,
+    MissingMethodError(String),
+}
+
+impl fmt::Display for CLIError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        match *self {
+            CLIError::Configuration(ref err) => write!(f, "Configuration -> {}", err),
+            CLIError::Input(ref err) => write!(f, "Input -> {}", err),
+            CLIError::Field(ref err) => write!(f, "Field -> {}", err),
+            CLIError::InvalidUploadProtocol(ref proto_name, ref valid_names) => writeln!(
+                f,
+                "'{}' is not a valid upload protocol. Choose from one of {}.",
+                proto_name,
+                valid_names.join(", ")
+            ),
+            CLIError::ParseError(ref arg_name, ref type_name, ref value, ref err_desc) => writeln!(
+                f,
+                "Failed to parse argument '{}' with value '{}' as {} with error: {}.",
+                arg_name, value, type_name, err_desc
+            ),
+            CLIError::UnknownParameter(ref param_name, ref possible_values) => {
+                let suffix = match did_you_mean(param_name, &possible_values) {
+                    Some(v) => format!(" Did you mean '{}' ?", v),
+                    None => String::new(),
+                };
+                writeln!(f, "Parameter '{}' is unknown.{}", param_name, suffix)
+            }
+            CLIError::InvalidKeyValueSyntax(ref kv, is_hashmap) => {
+                let hashmap_info = if is_hashmap { "hashmap " } else { "" };
+                writeln!(
+                    f,
+                    "'{}' does not match {}pattern <key>=<value>.",
+                    kv, hashmap_info
+                )
+            }
+            CLIError::MissingCommandError => writeln!(f, "Please specify the main sub-command."),
+            CLIError::MissingMethodError(ref cmd) => writeln!(
+                f,
+                "Please specify the method to call on the '{}' command.",
+                cmd
+            ),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct InvalidOptionsError {
+    pub issues: Vec<CLIError>,
+    pub exit_code: i32,
+}
+
+impl fmt::Display for InvalidOptionsError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        for issue in &self.issues {
+            issue.fmt(f)?;
+        }
+        Ok(())
+    }
+}
+
+impl InvalidOptionsError {
+    pub fn single(err: CLIError, exit_code: i32) -> InvalidOptionsError {
+        InvalidOptionsError {
+            issues: vec![err],
+            exit_code,
+        }
+    }
+
+    pub fn new() -> InvalidOptionsError {
+        InvalidOptionsError {
+            issues: Vec::new(),
+            exit_code: 1,
+        }
+    }
+}
+
+pub fn assure_config_dir_exists(dir: &str) -> Result<String, CLIError> {
+    let trdir = dir.trim();
+    if trdir.is_empty() {
+        return Err(CLIError::Configuration(ConfigurationError::DirectoryUnset));
+    }
+
+    let expanded_config_dir = if trdir.as_bytes()[0] == b'~' {
+        match env::var("HOME")
+            .ok()
+            .or_else(|| env::var("UserProfile").ok())
+        {
+            None => {
+                return Err(CLIError::Configuration(
+                    ConfigurationError::HomeExpansionFailed(trdir.to_string()),
+                ))
+            }
+            Some(mut user) => {
+                user.push_str(&trdir[1..]);
+                user
+            }
+        }
+    } else {
+        trdir.to_string()
+    };
+
+    if let Err(err) = fs::create_dir(&expanded_config_dir) {
+        if err.kind() != io::ErrorKind::AlreadyExists {
+            return Err(CLIError::Configuration(
+                ConfigurationError::DirectoryCreationFailed((expanded_config_dir, err)),
+            ));
+        }
+    }
+
+    Ok(expanded_config_dir)
+}
+
+pub fn application_secret_from_directory(
+    dir: &str,
+    secret_basename: &str,
+    json_console_secret: &str,
+) -> Result<ApplicationSecret, CLIError> {
+    let secret_path = Path::new(dir).join(secret_basename);
+    let secret_str = || secret_path.as_path().to_str().unwrap().to_string();
+    let secret_io_error = |io_err: io::Error| {
+        Err(CLIError::Configuration(ConfigurationError::Io((
+            secret_str(),
+            io_err,
+        ))))
+    };
+
+    for _ in 0..2 {
+        match fs::File::open(&secret_path) {
+            Err(mut err) => {
+                if err.kind() == io::ErrorKind::NotFound {
+                    // Write our built-in one - user may adjust the written file at will
+
+                    err = match fs::OpenOptions::new()
+                        .create(true)
+                        .write(true)
+                        .truncate(true)
+                        .open(&secret_path)
+                    {
+                        Err(cfe) => cfe,
+                        Ok(mut f) => {
+                            // Assure we convert 'ugly' json string into pretty one
+                            let console_secret: ConsoleApplicationSecret =
+                                json::from_str(json_console_secret).unwrap();
+                            match json::to_writer_pretty(&mut f, &console_secret) {
+                                Err(serde_err) => {
+                                    panic!("Unexpected serde error: {:#?}", serde_err)
+                                }
+                                Ok(_) => continue,
+                            }
+                        }
+                    };
+                    // fall through to IO error handling
+                }
+                return secret_io_error(err);
+            }
+            Ok(f) => match json::de::from_reader::<_, ConsoleApplicationSecret>(f) {
+                Err(json_err) => {
+                    return Err(CLIError::Configuration(ConfigurationError::Secret(
+                        ApplicationSecretError::DecoderError((secret_str(), json_err)),
+                    )))
+                }
+                Ok(console_secret) => match console_secret.installed {
+                    Some(secret) => return Ok(secret),
+                    None => {
+                        return Err(CLIError::Configuration(ConfigurationError::Secret(
+                            ApplicationSecretError::FormatError(secret_str()),
+                        )))
+                    }
+                },
+            },
+        }
+    }
+    unreachable!();
+}
+
+
+#[cfg(test)]
+mod test_cli {
+    use super::*;
+
+    use std::default::Default;
+
+    #[test]
+    fn cursor() {
+        let mut c: FieldCursor = Default::default();
+
+        assert_eq!(c.to_string(), "");
+        assert_eq!(c.num_fields(), 0);
+        assert!(c.set("").is_err());
+        assert!(c.set(".").is_ok());
+        assert!(c.set("..").is_err());
+        assert_eq!(c.num_fields(), 0);
+
+        assert!(c.set("foo").is_ok());
+        assert_eq!(c.to_string(), "foo");
+        assert_eq!(c.num_fields(), 1);
+        assert!(c.set("..").is_ok());
+        assert_eq!(c.num_fields(), 0);
+        assert_eq!(c.to_string(), "");
+
+        assert!(c.set("foo.").is_err());
+
+        assert!(c.set("foo.bar").is_ok());
+        assert_eq!(c.num_fields(), 2);
+        assert_eq!(c.to_string(), "foo.bar");
+        assert!(c.set("sub.level").is_ok());
+        assert_eq!(c.num_fields(), 4);
+        assert_eq!(c.to_string(), "foo.bar.sub.level");
+        assert!(c.set("...other").is_ok());
+        assert_eq!(c.to_string(), "foo.bar.other");
+        assert_eq!(c.num_fields(), 3);
+        assert!(c.set(".one.two.three...beer").is_ok());
+        assert_eq!(c.num_fields(), 2);
+        assert_eq!(c.to_string(), "one.beer");
+        assert!(c.set("one.two.three...").is_ok());
+        assert_eq!(c.num_fields(), 3);
+        assert_eq!(c.to_string(), "one.beer.one");
+    }
+}