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|
use derive_builder::Builder;
use std::collections::HashMap;
#[allow(dead_code)]
pub enum ValueRequirement {
None,
Required(&'static str),
Optional(&'static str),
}
#[derive(Builder)]
#[builder(pattern = "owned")]
pub struct Option {
#[builder(setter(into), default = "'\\0'")]
short: char,
long: &'static str,
#[builder(setter(into), default = "\"\"")]
description: &'static str,
#[builder(setter(name = "value"), default = "ValueRequirement::None")]
value_req: ValueRequirement,
#[builder(setter(skip))]
is_set: bool,
#[builder(setter(skip))]
value: std::option::Option<String>,
}
pub struct Options {
options: Vec<Option>,
short: HashMap<char, usize>,
long: HashMap<&'static str, usize>,
}
impl Option {
pub fn short(&self) -> char {
self.short
}
pub fn long(&self) -> &'static str {
self.long
}
pub fn description(&self) -> &'static str {
self.description
}
pub fn is_set(&self) -> bool {
self.is_set
}
pub fn value(&self) -> &std::option::Option<String> {
&self.value
}
fn set(&mut self, value: std::option::Option<String>) {
self.is_set = true;
self.value = value;
}
}
impl Options {
pub fn new() -> Self {
Options {
options: Vec::new(),
short: HashMap::new(),
long: HashMap::new(),
}
}
pub fn push(&mut self, option: Option) -> usize {
let index = self.options.len();
if option.short != '\0' {
self.short.insert(option.short, index);
}
if option.long != "" {
self.long.insert(option.long, index);
}
self.options.push(option);
index
}
}
impl std::ops::Index<usize> for Options {
type Output = Option;
fn index(&self, index: usize) -> &Self::Output {
self.options.index(index)
}
}
pub struct Arguments {
pub program: std::option::Option<String>,
pub args: Vec<String>,
}
pub trait Parser {
fn run(
&self,
options: &mut Options,
args: impl IntoIterator<Item = String>,
) -> Result<Arguments, String>;
fn print_help(&self, options: &Options);
}
#[allow(dead_code)]
pub struct LongOnlyParser {}
#[allow(dead_code)]
pub struct ShortAndLongParser {}
fn print_list(list: Vec<(String, &str)>) {
let mut left_len: usize = 0;
for (left, _) in &list {
left_len = std::cmp::max(left_len, left.len());
}
for (left, right) in &list {
println!("{left:<left_len$} {right}");
}
}
#[allow(dead_code)]
impl LongOnlyParser {
pub fn new() -> LongOnlyParser {
LongOnlyParser {}
}
}
impl Parser for LongOnlyParser {
fn run(
&self,
options: &mut Options,
args: impl IntoIterator<Item = String>,
) -> Result<Arguments, String> {
let mut ret = Vec::new();
let mut args_iter = args.into_iter();
let program = args_iter.next();
while let Some(arg) = args_iter.next() {
if arg.starts_with("-") {
if arg == "--" {
// All following arguments are just that.
while let Some(arg) = args_iter.next() {
ret.push(arg)
}
break;
}
let start = 1;
let name;
let mut value;
if let Some(end) = arg.find('=') {
name = arg.get(start..end).unwrap();
value = Some(arg.get(end + 1..).unwrap().to_string());
} else {
name = arg.get(start..).unwrap();
value = None;
}
if let Some(index) = options.long.get(name) {
let ref mut option = options.options[*index];
match option.value_req {
ValueRequirement::None => {
if value.is_some() {
return Err(format!("option '{}' doesn't allow an argument", arg));
}
}
ValueRequirement::Required(_) => {
if value.is_none() {
value = args_iter.next();
if value.is_none() {
return Err(format!("option '{}' requires an argument", arg));
}
}
}
ValueRequirement::Optional(_) => {}
}
option.set(value);
} else {
return Err(format!("unrecognized option '{}'", arg));
}
} else {
ret.push(arg)
}
}
Ok(Arguments { program, args: ret })
}
fn print_help(&self, options: &Options) {
let mut lines = Vec::new();
for (_, index) in &options.long {
let ref option = options[*index];
let left = match option.value_req {
ValueRequirement::None => format!("-{}", option.long()),
ValueRequirement::Required(name) => format!("-{}={}", option.long(), name),
ValueRequirement::Optional(name) => format!("-{}[={}]", option.long(), name),
};
lines.push((left, option.description()));
}
print_list(lines);
}
}
#[allow(dead_code)]
impl ShortAndLongParser {
pub fn new() -> ShortAndLongParser {
ShortAndLongParser {}
}
}
impl Parser for ShortAndLongParser {
fn run(
&self,
options: &mut Options,
args: impl IntoIterator<Item = String>,
) -> Result<Arguments, String> {
let mut ret = Vec::new();
let mut args_iter = args.into_iter();
let program = args_iter.next();
while let Some(arg) = args_iter.next() {
if arg.starts_with("--") {
if arg.len() == 2 {
// All following arguments are just that.
while let Some(arg) = args_iter.next() {
ret.push(arg)
}
break;
}
let start = 2;
let name;
let mut value;
if let Some(end) = arg.find('=') {
name = arg.get(start..end).unwrap();
value = Some(arg.get(end + 1..).unwrap().to_string());
} else {
name = arg.get(start..).unwrap();
value = None;
}
if let Some(index) = options.long.get(name) {
let ref mut option = options.options[*index];
match option.value_req {
ValueRequirement::None => {
if value.is_some() {
return Err(format!("option '{}' doesn't allow an argument", arg));
}
}
ValueRequirement::Required(_) => {
if value.is_none() {
value = args_iter.next();
if value.is_none() {
return Err(format!("option '{}' requires an argument", arg));
}
}
}
ValueRequirement::Optional(_) => {}
}
option.set(value);
} else {
return Err(format!("unrecognized option '{}'", arg));
}
} else if arg.starts_with("-") && arg.len() > 1 {
for c in arg.get(1..).unwrap().chars() {
if let Some(index) = options.short.get(&c) {
let ref mut option = options.options[*index];
let mut value = None;
match option.value_req {
ValueRequirement::None => {}
ValueRequirement::Required(_) => {
value = args_iter.next();
if value.is_none() {
return Err(format!("option requires an argument -- '{}", c));
}
}
ValueRequirement::Optional(_) => {}
}
option.set(value);
} else {
return Err(format!("invalid option -- '{}'", c));
}
}
} else {
ret.push(arg)
}
}
Ok(Arguments { program, args: ret })
}
fn print_help(&self, options: &Options) {
let mut lines = Vec::new();
for option in &options.options {
let left: String;
if option.short() == '\0' {
left = match option.value_req {
ValueRequirement::None => format!(" --{}", option.long()),
ValueRequirement::Required(name) => format!(" --{}={}", option.long(), name),
ValueRequirement::Optional(name) => {
format!(" --{}[={}]", option.long(), name)
}
};
} else if option.long() == "" {
left = match option.value_req {
ValueRequirement::None => format!("-{}", option.short()),
ValueRequirement::Required(name) => format!("-{}={}", option.short(), name),
ValueRequirement::Optional(name) => format!("-{}[={}]", option.short(), name),
};
} else {
left = match option.value_req {
ValueRequirement::None => format!("-{}, --{}", option.short(), option.long()),
ValueRequirement::Required(name) => {
format!("-{}, --{}={}", option.short(), option.long(), name)
}
ValueRequirement::Optional(name) => {
format!("-{}, --{}[={}]", option.short(), option.long(), name)
}
};
}
lines.push((left, option.description()));
}
print_list(lines);
}
}
|
