Moving data provider structs into their own crates (#451)

Adds "provider_serde" feature across components

components/datetime/Cargo.toml

@@ -19,10 +19,14 @@ include = [
     "README.md"
 ]
 
+[package.metadata.cargo-all-features]
+skip_optional_dependencies = true
+
 [dependencies]
 icu_locid = { version = "0.1", path = "../locid" }
 icu_provider = { version = "0.1", path = "../provider" }
 writeable = { version = "0.2", path = "../../utils/writeable" }
+serde = { version = "1.0", features = ["derive"], optional = true }
 
 [dev-dependencies]
 criterion = "0.3"
@@ -36,14 +40,25 @@ serde_json = "1.0"
 bench = false  # This option is required for Benchmark CI
 
 [features]
-default = []
+default = ["provider_serde"]
 bench = []
+provider_serde = ["serde"]
+serialize_none = []
 
 [[bench]]
 name = "datetime"
 harness = false
+required-features = ["provider_serde"]
 
 [[bench]]
 name = "pattern"
 harness = false
 required-features = ["bench"]
+
+[[test]]
+name = "datetime"
+required-features = ["provider_serde"]
+
+[[example]]
+name = "work_log"
+required-features = ["provider_serde"]

components/datetime/src/format.rs

@@ -5,8 +5,8 @@ use crate::date::{self, DateTimeType};
 use crate::error::DateTimeFormatError;
 use crate::fields::{self, FieldLength, FieldSymbol};
 use crate::pattern::{Pattern, PatternItem};
-use crate::provider::DateTimeDates;
-use icu_provider::structs;
+use crate::provider;
+use crate::provider::helpers::DateTimeDates;
 use std::fmt;
 use writeable::Writeable;
 
@@ -42,7 +42,7 @@ where
     T: DateTimeType,
 {
     pub(crate) pattern: &'l Pattern,
-    pub(crate) data: &'l structs::dates::gregory::DatesV1,
+    pub(crate) data: &'l provider::gregory::DatesV1,
     pub(crate) date_time: &'l T,
 }
 
@@ -98,7 +98,7 @@ fn get_day_of_week(year: usize, month: date::Month, day: date::Day) -> date::Wee
 
 pub fn write_pattern<T, W>(
     pattern: &crate::pattern::Pattern,
-    data: &structs::dates::gregory::DatesV1,
+    data: &provider::gregory::DatesV1,
     date_time: &T,
     w: &mut W,
 ) -> Result<(), DateTimeFormatError>

components/datetime/src/lib.rs

@@ -1,6 +1,7 @@
 // This file is part of ICU4X. For terms of use, please see the file
 // called LICENSE at the top level of the ICU4X source tree
 // (online at: https://github.com/unicode-org/icu4x/blob/master/LICENSE ).
+
 //! `icu_datetime` is one of the [`ICU4X`] components.
 //!
 //! This API provides necessary functionality for formatting date and time to user readable textual representation.
@@ -12,6 +13,7 @@
 //! # Examples
 //!
 //! ```
+//! # #[cfg(feature = "provider_serde")] {
 //! use icu_locid_macros::langid;
 //! use icu_datetime::{DateTimeFormat, DateTimeFormatOptions, date::MockDateTime, options::style};
 //!
@@ -35,12 +37,14 @@
 //!
 //! let formatted_date = dtf.format(&date);
 //! assert_eq!(formatted_date.to_string(), "Sep 12, 2020, 12:35 PM");
+//! # } // feature = "provider_serde"
 //! ```
 //!
 //! The options can be created more ergonomically using the `Into` trait to automatically
 //! convert a [`options::style::Bag`] into a [`DateTimeFormatOptions::Style`].
 //!
 //! ```
+//! # #[cfg(feature = "provider_serde")] {
 //! # use icu_locid_macros::langid;
 //! # use icu_datetime::{DateTimeFormat, DateTimeFormatOptions, date::MockDateTime, options::style};
 //! # let provider = icu_testdata::get_provider();
@@ -52,6 +56,7 @@
 //! }.into();
 //!
 //! let dtf = DateTimeFormat::try_new(lid, &provider, &options);
+//! # } // feature = "provider_serde"
 //! ```
 //!
 //! At the moment, the crate provides only options using the [`Style`] bag, but in the future,
@@ -73,19 +78,18 @@ mod format;
 pub mod options;
 #[doc(hidden)]
 pub mod pattern;
-mod provider;
+pub mod provider;
 
+use crate::provider::helpers::DateTimeDates;
 use date::DateTimeType;
 pub use error::DateTimeFormatError;
 use format::write_pattern;
 pub use format::FormattedDateTime;
 use icu_locid::LanguageIdentifier;
 use icu_provider::prelude::*;
-use icu_provider::structs;
 #[doc(inline)]
 pub use options::DateTimeFormatOptions;
 use pattern::Pattern;
-use provider::DateTimeDates;
 use std::borrow::Cow;
 
 /// `DateTimeFormat` is the main structure of the `icu_datetime` component.
@@ -127,7 +131,7 @@ use std::borrow::Cow;
 pub struct DateTimeFormat<'d> {
     _langid: LanguageIdentifier,
     pattern: Pattern,
-    data: Cow<'d, structs::dates::gregory::DatesV1>,
+    data: Cow<'d, provider::gregory::DatesV1>,
 }
 
 impl<'d> DateTimeFormat<'d> {
@@ -152,15 +156,15 @@ impl<'d> DateTimeFormat<'d> {
     ///
     /// assert_eq!(dtf.is_ok(), true);
     /// ```
-    pub fn try_new<D: DataProvider<'d, structs::dates::gregory::DatesV1> + ?Sized>(
+    pub fn try_new<D: DataProvider<'d, provider::gregory::DatesV1> + ?Sized>(
         langid: LanguageIdentifier,
         data_provider: &D,
         options: &DateTimeFormatOptions,
     ) -> Result<Self, DateTimeFormatError> {
         let data = data_provider
             .load_payload(&DataRequest {
                 resource_path: ResourcePath {
-                    key: structs::dates::key::GREGORY_V1,
+                    key: provider::key::GREGORY_V1,
                     options: ResourceOptions {
                         variant: None,
                         langid: Some(langid.clone()),

components/datetime/src/provider.rs → components/datetime/src/provider/helpers.rs

@@ -6,7 +6,7 @@ use crate::error::DateTimeFormatError;
 use crate::fields;
 use crate::options::{style, DateTimeFormatOptions};
 use crate::pattern::Pattern;
-use icu_provider::structs;
+use crate::provider;
 use std::borrow::Cow;
 
 type Result<T> = std::result::Result<T, DateTimeFormatError>;
@@ -42,7 +42,7 @@ pub trait DateTimeDates {
     ) -> &Cow<str>;
 }
 
-impl DateTimeDates for structs::dates::gregory::DatesV1 {
+impl DateTimeDates for provider::gregory::DatesV1 {
     fn get_pattern_for_options(&self, options: &DateTimeFormatOptions) -> Result<Option<Pattern>> {
         match options {
             DateTimeFormatOptions::Style(bag) => self.get_pattern_for_style_bag(bag),