Fix multiple WorldInit derivers conflicting implementations in a si…

…ngle module (#150, #148)

CHANGELOG.md

@@ -6,6 +6,20 @@ All user visible changes to `cucumber` crate will be documented in this file. Th
 
 
 
+## [0.10.2] · ???
+[0.10.2]: /../../tree/v0.10.2
+
+[Diff](/../../compare/v0.10.1...v0.10.2) | [Milestone](/../../milestone/5)
+
+### Fixed
+
+- Multiple `WorldInit` derivers conflicting implementations in a single module. ([#150])
+
+[#150]: /../../pull/150
+
+
+
+
 ## [0.10.1] · 2021-10-29
 [0.10.1]: /../../tree/v0.10.1
 

codegen/Cargo.toml

@@ -37,3 +37,8 @@ tokio = { version = "1.12", features = ["macros", "rt-multi-thread", "time"] }
 name = "example"
 path = "tests/example.rs"
 harness = false
+
+[[test]]
+name = "two_worlds"
+path = "tests/two_worlds.rs"
+harness = false

codegen/src/derive.rs

@@ -21,11 +21,11 @@ pub(crate) fn world_init(
 ) -> syn::Result<TokenStream> {
     let input = syn::parse2::<syn::DeriveInput>(input)?;
 
-    let step_types = step_types(steps);
-    let step_structs = generate_step_structs(steps, &input);
-
     let world = &input.ident;
 
+    let step_types = step_types(steps, world);
+    let step_structs = generate_step_structs(steps, &input);
+
     Ok(quote! {
         impl ::cucumber::codegen::WorldInventory<
             #( #step_types, )*
@@ -38,12 +38,12 @@ pub(crate) fn world_init(
 /// Generates [`syn::Ident`]s of generic types for private trait impl.
 ///
 /// [`syn::Ident`]: struct@syn::Ident
-fn step_types(steps: &[&str]) -> Vec<syn::Ident> {
+fn step_types(steps: &[&str], world: &syn::Ident) -> Vec<syn::Ident> {
     steps
         .iter()
         .map(|step| {
             let step = to_pascal_case(step);
-            format_ident!("Cucumber{}", step)
+            format_ident!("Cucumber{}{}", step, world)
         })
         .collect()
 }
@@ -55,7 +55,7 @@ fn generate_step_structs(
 ) -> Vec<TokenStream> {
     let (world, world_vis) = (&world.ident, &world.vis);
 
-    step_types(steps)
+    step_types(steps, world)
         .iter()
         .map(|ty| {
             quote! {
@@ -101,3 +101,152 @@ fn generate_step_structs(
         })
         .collect()
 }
+
+#[cfg(test)]
+mod spec {
+    use quote::quote;
+    use syn::parse_quote;
+
+    #[test]
+    fn expand() {
+        let input = parse_quote! {
+            pub struct World;
+        };
+
+        let output = quote! {
+            impl ::cucumber::codegen::WorldInventory<
+                CucumberGivenWorld, CucumberWhenWorld, CucumberThenWorld,
+            > for World {}
+
+            #[automatically_derived]
+            #[doc(hidden)]
+            pub struct CucumberGivenWorld {
+                #[doc(hidden)]
+                pub loc: ::cucumber::step::Location,
+
+                #[doc(hidden)]
+                pub regex: ::cucumber::codegen::Regex,
+
+                #[doc(hidden)]
+                pub func: ::cucumber::Step<World>,
+            }
+
+            #[automatically_derived]
+            impl ::cucumber::codegen::StepConstructor<World> for
+                CucumberGivenWorld
+            {
+                fn new (
+                    loc: ::cucumber::step::Location,
+                    regex: ::cucumber::codegen::Regex,
+                    func: ::cucumber::Step<World>,
+                ) -> Self {
+                    Self { loc, regex, func }
+                }
+
+                fn inner(&self) -> (
+                    ::cucumber::step::Location,
+                    ::cucumber::codegen::Regex,
+                    ::cucumber::Step<World>,
+                ) {
+                    (
+                        self.loc.clone(),
+                        self.regex.clone(),
+                        self.func.clone(),
+                    )
+                }
+            }
+
+            #[automatically_derived]
+            ::cucumber::codegen::collect!(CucumberGivenWorld);
+
+            #[automatically_derived]
+            #[doc(hidden)]
+            pub struct CucumberWhenWorld {
+                #[doc(hidden)]
+                pub loc: ::cucumber::step::Location,
+
+                #[doc(hidden)]
+                pub regex: ::cucumber::codegen::Regex,
+
+                #[doc(hidden)]
+                pub func: ::cucumber::Step<World>,
+            }
+
+            #[automatically_derived]
+            impl ::cucumber::codegen::StepConstructor<World> for
+                CucumberWhenWorld
+            {
+                fn new (
+                    loc: ::cucumber::step::Location,
+                    regex: ::cucumber::codegen::Regex,
+                    func: ::cucumber::Step<World>,
+                ) -> Self {
+                    Self { loc, regex, func }
+                }
+
+                fn inner(&self) -> (
+                    ::cucumber::step::Location,
+                    ::cucumber::codegen::Regex,
+                    ::cucumber::Step<World>,
+                ) {
+                    (
+                        self.loc.clone(),
+                        self.regex.clone(),
+                        self.func.clone(),
+                    )
+                }
+            }
+
+            #[automatically_derived]
+            ::cucumber::codegen::collect!(CucumberWhenWorld);
+
+            #[automatically_derived]
+            #[doc(hidden)]
+            pub struct CucumberThenWorld {
+                #[doc(hidden)]
+                pub loc: ::cucumber::step::Location,
+
+                #[doc(hidden)]
+                pub regex: ::cucumber::codegen::Regex,
+
+                #[doc(hidden)]
+                pub func: ::cucumber::Step<World>,
+            }
+
+            #[automatically_derived]
+            impl ::cucumber::codegen::StepConstructor<World> for
+                CucumberThenWorld
+            {
+                fn new (
+                    loc: ::cucumber::step::Location,
+                    regex: ::cucumber::codegen::Regex,
+                    func: ::cucumber::Step<World>,
+                ) -> Self {
+                    Self { loc, regex, func }
+                }
+
+                fn inner(&self) -> (
+                    ::cucumber::step::Location,
+                    ::cucumber::codegen::Regex,
+                    ::cucumber::Step<World>,
+                ) {
+                    (
+                        self.loc.clone(),
+                        self.regex.clone(),
+                        self.func.clone(),
+                    )
+                }
+            }
+
+            #[automatically_derived]
+            ::cucumber::codegen::collect!(CucumberThenWorld);
+        };
+
+        assert_eq!(
+            super::world_init(input, &["given", "when", "then"])
+                .unwrap()
+                .to_string(),
+            output.to_string(),
+        );
+    }
+}

codegen/tests/two_worlds.rs

@@ -0,0 +1,80 @@
+use std::{convert::Infallible, time::Duration};
+
+use async_trait::async_trait;
+use cucumber::{gherkin::Step, given, when, World, WorldInit};
+use tokio::time;
+
+#[derive(Debug, WorldInit)]
+pub struct FirstWorld {
+    foo: i32,
+}
+
+#[async_trait(?Send)]
+impl World for FirstWorld {
+    type Error = Infallible;
+
+    async fn new() -> Result<Self, Self::Error> {
+        Ok(Self { foo: 0 })
+    }
+}
+
+#[derive(Debug, WorldInit)]
+pub struct SecondWorld {
+    foo: i32,
+}
+
+#[async_trait(?Send)]
+impl World for SecondWorld {
+    type Error = Infallible;
+
+    async fn new() -> Result<Self, Self::Error> {
+        Ok(Self { foo: 0 })
+    }
+}
+
+#[given(regex = r"(\S+) is (\d+)")]
+#[when(regex = r"(\S+) is (\d+)")]
+async fn test_regex_async(
+    w: &mut FirstWorld,
+    step: String,
+    #[step] ctx: &Step,
+    num: usize,
+) {
+    time::sleep(Duration::new(1, 0)).await;
+
+    assert_eq!(step, "foo");
+    assert_eq!(num, 0);
+    assert_eq!(ctx.value, "foo is 0");
+
+    w.foo += 1;
+}
+
+#[given(regex = r"(\S+) is sync (\d+)")]
+fn test_regex_sync_slice(w: &mut SecondWorld, step: &Step, matches: &[String]) {
+    assert_eq!(matches[0], "foo");
+    assert_eq!(matches[1].parse::<usize>().unwrap(), 0);
+    assert_eq!(step.value, "foo is sync 0");
+
+    w.foo += 1;
+}
+
+#[tokio::main]
+async fn main() {
+    let writer = FirstWorld::cucumber()
+        .max_concurrent_scenarios(None)
+        .run("./tests/features")
+        .await;
+
+    assert_eq!(writer.steps.passed, 7);
+    assert_eq!(writer.steps.skipped, 2);
+    assert_eq!(writer.steps.failed, 0);
+
+    let writer = SecondWorld::cucumber()
+        .max_concurrent_scenarios(None)
+        .run("./tests/features")
+        .await;
+
+    assert_eq!(writer.steps.passed, 1);
+    assert_eq!(writer.steps.skipped, 5);
+    assert_eq!(writer.steps.failed, 0);
+}