proxmox-backup/src/getopts.rs

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Rust
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use crate::api::schema::*;
use failure::*;
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use serde_json::Value;
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#[derive(Debug)]
enum RawArgument {
Separator,
Argument { value: String },
Option { name: String, value: Option<String> },
}
fn parse_argument(arg: &str) -> RawArgument {
let bytes = arg.as_bytes();
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let length = bytes.len();
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if length < 2 || bytes[0] != b'-' {
return RawArgument::Argument {
value: arg.to_string(),
};
}
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let mut first = 1;
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if bytes[1] == b'-' {
if length == 2 {
return RawArgument::Separator;
}
first = 2;
}
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for start in first..length {
if bytes[start] == b'=' {
// Since we take a &str, we know the contents of it are valid utf8.
// Since bytes[start] == b'=', we know the byte beginning at start is a single-byte
// code pointer. We also know that 'first' points exactly after a single-byte code
// point as it points to the first byte after a hyphen.
// Therefore we know arg[first..start] is valid utf-8, therefore it is safe to use
// get_unchecked() to speed things up.
return RawArgument::Option {
name: unsafe { arg.get_unchecked(first..start).to_string() },
value: Some(unsafe { arg.get_unchecked((start + 1)..).to_string() }),
};
}
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}
return RawArgument::Option {
name: unsafe { arg.get_unchecked(first..).to_string() },
value: None,
};
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}
pub fn parse_arguments<T: AsRef<str>>(
args: &[T],
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arg_param: &Vec<&'static str>,
schema: &ObjectSchema,
) -> Result<(Value, Vec<String>), ParameterError> {
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let mut errors = ParameterError::new();
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let properties = &schema.properties;
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let mut data: Vec<(String, String)> = vec![];
let mut rest: Vec<String> = vec![];
let mut pos = 0;
while pos < args.len() {
match parse_argument(args[pos].as_ref()) {
RawArgument::Separator => {
break;
}
RawArgument::Option { name, value } => match value {
None => {
let mut want_bool = false;
let mut can_default = false;
if let Some((_optional, param_schema)) = properties.get::<str>(&name) {
if let Schema::Boolean(boolean_schema) = param_schema.as_ref() {
want_bool = true;
if let Some(default) = boolean_schema.default {
if default == false {
can_default = true;
}
} else {
can_default = true;
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}
}
}
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let mut next_is_argument = false;
let mut next_is_bool = false;
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if (pos + 1) < args.len() {
let next = args[pos + 1].as_ref();
if let RawArgument::Argument { value: _ } = parse_argument(next) {
next_is_argument = true;
if let Ok(_) = parse_boolean(next) {
next_is_bool = true;
}
}
}
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if want_bool {
if next_is_bool {
pos += 1;
data.push((name, args[pos].as_ref().to_string()));
} else if can_default {
data.push((name, "true".to_string()));
} else {
errors.push(format_err!("parameter '{}': {}", name,
"missing boolean value."));
}
} else {
if next_is_argument {
pos += 1;
data.push((name, args[pos].as_ref().to_string()));
} else {
errors.push(format_err!("parameter '{}': {}", name,
"missing parameter value."));
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}
}
}
Some(v) => {
data.push((name, v));
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}
}
RawArgument::Argument { value } => {
rest.push(value);
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}
}
pos += 1;
}
rest.reserve(args.len() - pos);
for i in &args[pos..] {
rest.push(i.as_ref().to_string());
}
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for i in 0..arg_param.len() {
if rest.len() > i {
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data.push((arg_param[i].to_string(), rest[i].clone()));
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} else {
errors.push(format_err!("missing argument '{}'", arg_param[i]));
}
}
if errors.len() > 0 {
return Err(errors);
}
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if arg_param.len() > 0 {
rest = rest[arg_param.len()..].to_vec();
}
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let options = parse_parameter_strings(&data, schema, true)?;
Ok((options, rest))
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}
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#[test]
fn test_boolean_arg() {
let schema = ObjectSchema::new("Parameters:")
.required(
"enable", BooleanSchema::new("Enable")
);
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let mut variants: Vec<(Vec<&str>, bool)> = vec![];
variants.push((vec!["-enable"], true));
variants.push((vec!["-enable=1"], true));
variants.push((vec!["-enable", "yes"], true));
variants.push((vec!["-enable", "Yes"], true));
variants.push((vec!["--enable", "1"], true));
variants.push((vec!["--enable", "ON"], true));
variants.push((vec!["--enable", "true"], true));
variants.push((vec!["--enable", "0"], false));
variants.push((vec!["--enable", "no"], false));
variants.push((vec!["--enable", "off"], false));
variants.push((vec!["--enable", "false"], false));
for (args, expect) in variants {
let res = parse_arguments(&args, &vec![], &schema);
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assert!(res.is_ok());
if let Ok((options, rest)) = res {
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assert!(options["enable"] == expect);
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assert!(rest.len() == 0);
}
}
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}
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#[test]
fn test_argument_paramenter() {
let schema = ObjectSchema::new("Parameters:")
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.required("enable", BooleanSchema::new("Enable."))
.required("storage", StringSchema::new("Storage."));
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let args = vec!["-enable", "local"];
let res = parse_arguments(&args, &vec!["storage"], &schema);
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assert!(res.is_ok());
if let Ok((options, rest)) = res {
assert!(options["enable"] == true);
assert!(options["storage"] == "local");
assert!(rest.len() == 0);
}
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}