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itconfig
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Merge pull request #25 from icetemple/vec 

feat: add vec supporting
This commit is contained in:
Dmitriy Pleshevskiy 2021-04-22 22:49:12 +02:00 committed by GitHub
parent fbd37930a7 13e200eedf
commit 43eb463918
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GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 508 additions and 44 deletions
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8
itconfig-macro/src/ast.rs
View File

@ -1,14 +1,15 @@
use crate::utils::SupportedBox;
use proc_macro2::TokenStream as TokenStream2;
use syn::{Attribute, Expr, Ident, Type};
pub struct RootNamespace {
pub(crate) struct RootNamespace {
pub name: Option<Ident>,
pub variables: Vec<Variable>,
pub namespaces: Vec<Namespace>,
pub meta: Vec<Attribute>,
}
pub struct Namespace {
pub(crate) struct Namespace {
pub name: Ident,
pub variables: Vec<Variable>,
pub namespaces: Vec<Namespace>,
@ -16,7 +17,7 @@ pub struct Namespace {
pub meta: Vec<Attribute>,
}
pub struct Variable {
pub(crate) struct Variable {
pub is_static: bool,
pub name: Ident,
pub ty: Type,
@ -24,4 +25,5 @@ pub struct Variable {
pub concat_parts: Option<Vec<TokenStream2>>,
pub env_name: Option<String>,
pub meta: Vec<Attribute>,
pub supported_box: Option<SupportedBox>,
}

32
itconfig-macro/src/expand.rs
View File

@ -1,5 +1,5 @@
use crate::ast::*;
use crate::utils::{is_option_type, vec_to_token_stream_2};
use crate::utils::{vec_to_token_stream_2, SupportedBox};
use proc_macro2::TokenStream as TokenStream2;
use quote::{quote, ToTokens, TokenStreamExt};
@ -136,13 +136,31 @@ impl ToTokens for Variable {
::std::env::set_var(#env_name, value.as_str());
value
}}
} else if self.initial.is_some() {
let initial = self.initial.as_ref().unwrap();
quote!(::itconfig::get_env_or_set_default(#env_name, #initial))
} else if is_option_type(&self.ty) {
quote!(::itconfig::maybe_get_env(#env_name))
} else if let Some(initial) = &self.initial {
match self.supported_box.clone() {
Some(SupportedBox::Vec(params)) => {
let sep = &params.sep();
quote!(::itconfig::get_vec_env_or_set_default(#env_name, #sep, #initial))
}
_ => quote!(::itconfig::get_env_or_set_default(#env_name, #initial)),
}
} else {
quote!(::itconfig::get_env_or_panic(#env_name))
match self.supported_box.clone() {
Some(SupportedBox::Option) => {
quote!(::itconfig::maybe_get_env(#env_name))
}
Some(SupportedBox::OptionVec(params)) => {
let sep = &params.sep();
quote!(::itconfig::maybe_get_vec_env(#env_name, #sep))
}
Some(SupportedBox::Vec(params)) => {
let sep = &params.sep();
quote!(::itconfig::get_vec_env_or_panic(#env_name, #sep))
}
None => {
quote!(::itconfig::get_env_or_panic(#env_name))
}
}
};
if self.is_static {

27
itconfig-macro/src/parse.rs
View File

@ -1,4 +1,5 @@
use crate::ast::*;
use crate::utils::{maybe_supported_box, SupportedBox, VecBoxParams};
use proc_macro2::{Ident, Span, TokenStream as TokenStream2};
use quote::quote;
use syn::ext::IdentExt;
@ -59,7 +60,8 @@ fn parse_namespace_content(
for attr in attributes {
if attr.path.is_ident("env_prefix") {
namespace.env_prefix = parse_attribute(attr, "env_prefix", &namespace.env_prefix)?;
let env_prefix = parse_attribute(attr, "env_prefix", &namespace.env_prefix)?;
namespace.env_prefix = Some(env_prefix);
} else {
namespace.meta.push(attr);
}
@ -71,9 +73,17 @@ fn parse_namespace_content(
for attr in attributes {
if attr.path.is_ident("env_name") {
variable.env_name = parse_attribute(attr, "env_name", &variable.env_name)?;
let env_name = parse_attribute(attr, "env_name", &variable.env_name)?;
variable.env_name = Some(env_name);
} else {
variable.meta.push(attr);
match variable.supported_box {
Some(SupportedBox::Vec(params)) if attr.path.is_ident("sep") => {
let sep = parse_attribute(attr, "sep", &params.sep_opt())?;
variable.supported_box =
Some(SupportedBox::Vec(VecBoxParams::new(Some(sep))));
}
_ => variable.meta.push(attr),
}
}
}
@ -83,11 +93,7 @@ fn parse_namespace_content(
Ok(())
}
fn parse_attribute(
attr: Attribute,
name: &'static str,
var: &Option<String>,
) -> Result<Option<String>> {
fn parse_attribute(attr: Attribute, name: &'static str, var: &Option<String>) -> Result<String> {
if var.is_some() {
let message = format!("You cannot use {} meta twice", &name);
return Err(Error::new_spanned(attr, message));
@ -97,7 +103,7 @@ fn parse_attribute(
Meta::NameValue(MetaNameValue {
lit: Lit::Str(lit_str),
..
}) => Ok(Some(lit_str.value())),
}) => Ok(lit_str.value()),
_ => {
let message = format!("expected #[{} = \"...\"]", &name);
Err(Error::new_spanned(attr, message))
@ -220,6 +226,8 @@ impl Parse for Variable {
parse_str("&'static str")?
};
let supported_box = maybe_supported_box(&ty);
if is_concat {
input.parse::<Lt>()?;
@ -263,6 +271,7 @@ impl Parse for Variable {
input.parse::<Comma>().ok();
Ok(Variable {
supported_box,
is_static,
name,
ty,

66
itconfig-macro/src/utils.rs
View File

@ -1,10 +1,38 @@
use proc_macro2::TokenStream as TokenStream2;
use quote::ToTokens;
use syn::{Path, Type};
use syn::{GenericArgument, Path, PathArguments, Type};
const OPTION_PATH_IDENTS: &[&str] = &["Option|", "std|option|Option|", "core|option|Option|"];
const VEC_PATH_IDENTS: &[&str] = &["Vec|", "std|vec|Vec|"];
pub fn vec_to_token_stream_2<T>(input: &[T]) -> Vec<TokenStream2>
#[derive(Debug, Clone, Default)]
pub(crate) struct VecBoxParams(Option<String>);
impl VecBoxParams {
#[inline]
pub(crate) fn new(sep: Option<String>) -> Self {
VecBoxParams(sep)
}
#[inline]
pub(crate) fn sep_opt(&self) -> Option<String> {
self.0.clone()
}
#[inline]
pub(crate) fn sep(&self) -> String {
self.0.clone().unwrap_or_else(|| String::from(","))
}
}
#[derive(Debug, Clone)]
pub(crate) enum SupportedBox {
Vec(VecBoxParams),
Option,
OptionVec(VecBoxParams),
}
pub(crate) fn vec_to_token_stream_2<T>(input: &[T]) -> Vec<TokenStream2>
where
T: ToTokens,
{
@ -22,15 +50,39 @@ fn path_ident(path: &Path) -> String {
})
}
fn is_option_path_ident(path_ident: String) -> bool {
fn is_option_path_ident(path_ident: &str) -> bool {
OPTION_PATH_IDENTS.iter().any(|s| path_ident == *s)
}
pub fn is_option_type(ty: &Type) -> bool {
fn is_vec_path_ident(path_ident: &str) -> bool {
VEC_PATH_IDENTS.iter().any(|s| path_ident == *s)
}
pub(crate) fn maybe_supported_box(ty: &Type) -> Option<SupportedBox> {
match ty {
Type::Path(ty_path) => {
ty_path.qself.is_none() && is_option_path_ident(path_ident(&ty_path.path))
Type::Path(ty_path) if ty_path.qself.is_none() => {
let ty_path_ident = path_ident(&ty_path.path);
if is_option_path_ident(&ty_path_ident) {
if let PathArguments::AngleBracketed(params) =
&ty_path.path.segments.iter().last().unwrap().arguments
{
if let Some(GenericArgument::Type(Type::Path(inner_ty_path))) =
params.args.first()
{
let ty_path_ident = path_ident(&inner_ty_path.path);
if is_vec_path_ident(&ty_path_ident) {
return Some(SupportedBox::OptionVec(Default::default()));
}
}
}
Some(SupportedBox::Option)
} else if is_vec_path_ident(&ty_path_ident) {
Some(SupportedBox::Vec(Default::default()))
} else {
None
}
}
_ => false,
_ => None,
}
}

60
itconfig-tests/tests/config_macro.rs
View File

@ -506,6 +506,7 @@ mod test_case_22 {
"static ",
STATIC_CONCAT_PART => "part",
),
static STATIC_VEC: Vec<u32> => vec![1],
}
#[test]
@ -528,7 +529,8 @@ mod test_case_22 {
assert_eq!(config::STATIC_USIZE(), 1);
assert_eq!(config::STATIC_F32(), 1.0);
assert_eq!(config::STATIC_F64(), 1.0);
assert_eq!(config::STATIC_CONCAT_VARIABLE(), "static part".to_string())
assert_eq!(config::STATIC_CONCAT_VARIABLE(), "static part".to_string());
assert_eq!(config::STATIC_VEC(), vec![1]);
}
}
@ -547,8 +549,6 @@ mod test_case_23 {
#[test]
fn optional_variables() {
config::init();
env::set_var("SOMETHING", "hello world");
assert_eq!(config::SOMETHING(), Some("hello world"));
@ -557,3 +557,57 @@ mod test_case_23 {
assert_eq!(config::NOTHING(), None);
}
}
mod test_case_24 {
use std::env;
itconfig::config! {
MY_VEC: Vec<&'static str>,
#[env_name = "MY_VEC"]
STD_VEC: std::vec::Vec<&'static str>,
}
#[test]
fn vector_of_values() {
env::set_var("MY_VEC", "paypal,stripe");
assert_eq!(config::MY_VEC(), vec!["paypal", "stripe"]);
assert_eq!(config::STD_VEC(), vec!["paypal", "stripe"]);
}
}
mod test_case_25 {
use std::env;
itconfig::config! {
#[sep = ";"]
CUSTOM_SEP_MY_VEC: Vec<&'static str>,
#[env_name = "CUSTOM_SEP_MY_VEC"]
#[sep = ";"]
CUSTOM_SEP_STD_VEC: std::vec::Vec<&'static str>,
}
#[test]
fn custom_separator_for_vector() {
env::set_var("CUSTOM_SEP_MY_VEC", "paypal;stripe");
assert_eq!(config::CUSTOM_SEP_MY_VEC(), vec!["paypal", "stripe"]);
assert_eq!(config::CUSTOM_SEP_STD_VEC(), vec!["paypal", "stripe"]);
}
}
mod test_case_26 {
use std::env;
itconfig::config! {
OPTION_VEC: Option<Vec<&'static str>>,
}
#[test]
fn optional_vec() {
env::set_var("OPTION_VEC", "paypal,stripe");
assert_eq!(config::OPTION_VEC(), Some(vec!["paypal", "stripe"]));
}
}

2
itconfig/src/envstr.rs
View File

@ -5,7 +5,7 @@ use std::ops::Deref;
/// When we read the environment variable, we automatically convert the value
/// to EnvString and then convert it to your expected type.
///
#[derive(Debug, PartialEq, Clone)]
#[derive(Debug, Default, PartialEq, Eq, Clone)]
pub struct EnvString(String);
impl<T> From<T> for EnvString

13
itconfig/src/getenv.rs → itconfig/src/get_env.rs
View File

@ -1,5 +1,6 @@
use crate::envstr::*;
use crate::error::*;
use crate::utils::*;
use std::env;
/// Same as get_env but returns Option enum instead Result
@ -152,18 +153,6 @@ where
.and_then(|env_str| parse_env_variable(env_name, env_str))
}
fn parse_env_variable<T>(env_name: &str, env_str: EnvString) -> Result<T, EnvError>
where
T: FromEnvString,
{
FromEnvString::from_env_string(&env_str)
.map_err(|_| EnvError::FailedToParse(env_name.to_string()))
}
fn make_panic<T>(e: EnvError) -> T {
panic!("{}", e)
}
#[cfg(test)]
mod tests {
use super::*;

304
itconfig/src/get_vec_env.rs Normal file
View File

@ -0,0 +1,304 @@
use crate::envstr::*;
use crate::error::*;
use crate::utils::*;
use std::env;
/// Same as get_vec_env but returns Option enum instead Result
///
/// Example
/// -------
///
/// ```rust
/// # extern crate itconfig;
/// # use itconfig::*;
/// use std::env;
///
/// #[derive(Debug, PartialEq, Eq)]
/// enum PaymentPlatform {
/// PayPal,
/// Stripe,
/// SomethingElse,
/// }
///
/// impl FromEnvString for PaymentPlatform {
/// type Err = &'static str;
///
/// fn from_env_string(envstr: &EnvString) -> Result<Self, Self::Err> {
/// match envstr.to_lowercase().as_str() {
/// "paypal" => Ok(Self::PayPal),
/// "stripe" => Ok(Self::Stripe),
/// "smth" => Ok(Self::SomethingElse),
/// _ => Err("Unsupported payment platform"),
/// }
/// }
/// }
///
///
/// fn main () {
/// env::set_var("PAYMENT_PLATFORMS", "paypal,stripe");
///
/// let payment_platforms: Option<Vec<PaymentPlatform>> = maybe_get_vec_env("PAYMENT_PLATFORMS", ",");
/// assert_eq!(
/// payment_platforms,
/// Some(vec![PaymentPlatform::PayPal, PaymentPlatform::Stripe])
/// );
/// }
/// ```
///
pub fn maybe_get_vec_env<T>(env_name: &str, sep: &'static str) -> Option<Vec<T>>
where
T: FromEnvString,
{
get_vec_env(env_name, sep).ok()
}
/// This function is similar as `get_vec_env`, but it unwraps result with panic on error.
///
/// Panics
/// ------
/// Application will panic if environment variable is missing or cannot parse variable to
/// expected type
///
pub fn get_vec_env_or_panic<T>(env_name: &str, sep: &'static str) -> Vec<T>
where
T: FromEnvString,
{
get_vec_env(env_name, sep).unwrap_or_else(make_panic)
}
/// Try to read environment variable, split by separator and parse each item to expected
/// type.
///
/// Example
/// -------
///
/// ```rust
/// # extern crate itconfig;
/// # use itconfig::get_vec_env;
/// use std::env;
///
/// fn main () {
/// env::set_var("DEBUG", "true");
///
/// let result: Vec<bool> = get_vec_env("DEBUG", ",").unwrap();
///
/// assert_eq!(result, vec![true]);
/// }
/// ```
///
pub fn get_vec_env<T>(env_name: &str, sep: &str) -> Result<Vec<T>, EnvError>
where
T: FromEnvString,
{
get_vec_env_or(env_name, sep, |_| {
Err(EnvError::MissingVariable(env_name.to_string()))
})
}
/// This function is similar as `get_vec_env_or_panic`, but you can pass default value for
/// environment variable with `ToEnvString` trait.
///
/// Panics
/// ------
/// Application will panic if cannot parse variable to expected type
///
/// Example
/// -------
///
/// ```rust
/// # extern crate itconfig;
/// # use itconfig::get_vec_env_or_default;
/// use std::env;
///
/// fn main () {
/// let result: Vec<bool> = get_vec_env_or_default("TESTING", ",", vec!["true"]);
/// assert_eq!(result, vec![true]);
/// }
/// ```
///
pub fn get_vec_env_or_default<T, D>(env_name: &str, sep: &str, default: Vec<D>) -> Vec<T>
where
T: FromEnvString,
D: ToEnvString,
{
get_vec_env_or(env_name, sep, |_| Ok(vec_to_env_strings(default))).unwrap_or_else(make_panic)
}
/// This function is similar as `get_vec_env_or_default`, but the default value will be set to environment
/// variable, if env variable is missed.
///
/// Panics
/// ------
/// Application will panic if cannot parse variable to expected type
///
/// Example
/// -------
///
/// ```rust
/// # extern crate itconfig;
/// # use itconfig::get_vec_env_or_set_default;
/// use std::env;
///
/// fn main () {
/// let result: Vec<bool> = get_vec_env_or_set_default("TESTING", ",", vec!["true"]);
/// assert_eq!(result, vec![true]);
///
/// let var = env::var("TESTING").unwrap();
/// assert_eq!(var, "true");
/// }
/// ```
///
pub fn get_vec_env_or_set_default<T, D>(env_name: &str, sep: &str, default: Vec<D>) -> Vec<T>
where
T: FromEnvString,
D: ToEnvString,
{
get_vec_env_or(env_name, sep, |_| {
let default_env_strings = vec_to_env_strings(default);
let env_val = join(&default_env_strings, sep);
env::set_var(env_name, env_val.as_str());
Ok(default_env_strings)
})
.unwrap_or_else(make_panic)
}
/// This function returns env variable as `EnvString` structure. You can pass callback for custom
/// default expression. Callback should return `EnvString` value or `EnvError`
pub fn get_vec_env_or<T, F>(env_name: &str, sep: &str, cb: F) -> Result<Vec<T>, EnvError>
where
T: FromEnvString,
F: FnOnce(env::VarError) -> Result<Vec<EnvString>, EnvError>,
{
env::var(env_name)
.map(|s| {
s.split(sep)
.into_iter()
.map(|item| item.to_env_string())
.collect()
})
.or_else(cb)
.and_then(|items| {
items
.into_iter()
.map(|env_str| parse_env_variable(env_name, env_str))
.collect()
})
}
#[cfg(test)]
mod tests {
use super::*;
const SEP: &str = ",";
#[test]
#[should_panic(expected = "Environment variable \"TEST_CASE_VEC_1\" is missing")]
fn get_missing_vec_env() {
let _: Vec<&'static str> = get_vec_env_or_panic("TEST_CASE_VEC_1", SEP);
}
#[test]
#[should_panic(expected = "Failed to parse environment variable \"TEST_CASE_VEC_2\"")]
fn get_vec_env_with_invalid_value() {
let env_name = "TEST_CASE_VEC_2";
env::set_var(&env_name, "30r");
let _: Vec<u32> = get_vec_env_or_panic(env_name, SEP);
}
#[test]
fn get_result_of_missing_vec_env() {
let env_name = String::from("TEST_CASE_VEC_3");
let env_val = get_vec_env::<String>(&env_name, SEP);
assert_eq!(env_val, Err(EnvError::MissingVariable(env_name)))
}
#[test]
fn get_result_of_vec_env_with_invalid_value() {
let env_name = String::from("TEST_CASE_VEC_4");
env::set_var(&env_name, "30r");
let env_val = get_vec_env::<u32>(&env_name, SEP);
assert_eq!(env_val, Err(EnvError::FailedToParse(env_name)))
}
#[test]
fn get_result_of_vec_env_successfully() {
env::set_var("TEST_CASE_VEC_5", "30");
let env_var = get_vec_env("TEST_CASE_VEC_5", SEP);
assert_eq!(env_var, Ok(vec![30]));
}
#[test]
fn get_missing_vec_env_with_default_value() {
let flag: Vec<bool> = get_vec_env_or_default("TEST_CASE_VEC_6", SEP, vec!["true"]);
assert_eq!(flag, vec![true]);
}
#[test]
#[should_panic(expected = "Failed to parse environment variable \"TEST_CASE_VEC_7\"")]
fn get_invalid_vec_env_with_default_value() {
env::set_var("TEST_CASE_VEC_7", "30r");
get_vec_env_or_default::<u32, _>("TEST_CASE_VEC_7", SEP, vec![30]);
}
#[test]
#[should_panic(expected = "Failed to parse environment variable \"TEST_CASE_VEC_8\"")]
fn get_vec_env_with_invalid_default_value() {
get_vec_env_or_default::<u32, _>("TEST_CASE_VEC_8", SEP, vec!["30r"]);
}
#[test]
fn get_vec_env_with_default_successfully() {
env::set_var("TEST_CASE_VEC_9", "10");
let env_val: Vec<u32> = get_vec_env_or_default("TEST_CASE_VEC_9", SEP, vec![30]);
assert_eq!(env_val, vec![10])
}
#[test]
fn get_missing_vec_env_with_set_default_value() {
let flag: Vec<bool> = get_vec_env_or_set_default("TEST_CASE_VEC_10", SEP, vec!["true"]);
assert_eq!(flag, vec![true]);
let env_var = env::var("TEST_CASE_VEC_10");
assert_eq!(env_var, Ok(String::from("true")))
}
#[test]
fn get_optional_vec_env() {
env::set_var("TEST_CASE_VEC_11", "something");
let something: Option<Vec<&'static str>> = maybe_get_vec_env("TEST_CASE_VEC_11", SEP);
assert_eq!(something, Some(vec!["something"]));
let nothing: Option<Vec<&'static str>> = maybe_get_vec_env("TEST_CASE_VEC_11_NONE", SEP);
assert_eq!(nothing, None);
}
#[test]
fn get_custom_type_from_vec_env() {
#[derive(Debug, PartialEq, Eq)]
enum PaymentPlatform {
PayPal,
Stripe,
SomethingElse,
}
impl FromEnvString for PaymentPlatform {
type Err = &'static str;
fn from_env_string(envstr: &EnvString) -> Result<Self, Self::Err> {
match envstr.to_lowercase().as_str() {
"paypal" => Ok(Self::PayPal),
"stripe" => Ok(Self::Stripe),
"smth" => Ok(Self::SomethingElse),
_ => Err("Unsupported payment platform"),
}
}
}
env::set_var("TEST_CASE_VEC_12", "paypal,stripe");
let something: Option<Vec<PaymentPlatform>> = maybe_get_vec_env("TEST_CASE_VEC_12", SEP);
assert_eq!(
something,
Some(vec![PaymentPlatform::PayPal, PaymentPlatform::Stripe])
);
}
}

7
itconfig/src/lib.rs
View File

@ -149,11 +149,14 @@
mod envstr;
mod error;
mod getenv;
mod get_env;
mod get_vec_env;
pub(crate) mod utils;
pub use self::envstr::*;
pub use self::error::*;
pub use self::getenv::*;
pub use self::get_env::*;
pub use self::get_vec_env::*;
#[cfg(feature = "macro")]
extern crate itconfig_macro;

33
itconfig/src/utils.rs Normal file
View File

@ -0,0 +1,33 @@
use crate::{EnvError, EnvString, FromEnvString, ToEnvString};
pub(crate) fn parse_env_variable<T>(env_name: &str, env_str: EnvString) -> Result<T, EnvError>
where
T: FromEnvString,
{
FromEnvString::from_env_string(&env_str)
.map_err(|_| EnvError::FailedToParse(env_name.to_string()))
}
pub(crate) fn make_panic<T>(e: EnvError) -> T {
panic!("{}", e)
}
pub(crate) fn join(env_strings: &[EnvString], sep: &str) -> String {
env_strings
.iter()
.enumerate()
.fold(String::new(), |mut res, (i, item)| {
if i > 0 {
res.push_str(sep);
}
res.push_str(&item);
res
})
}
pub(crate) fn vec_to_env_strings<T>(values: Vec<T>) -> Vec<EnvString>
where
T: ToEnvString,
{
values.into_iter().map(EnvString::from).collect()
}