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Parse class definitions and generate empty structs. #79

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merged 1 commit into from
Jul 11, 2018
Merged

Parse class definitions and generate empty structs. #79

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285 changes: 274 additions & 11 deletions generator/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,10 +21,53 @@ fn java_generate_impl(input: TokenStream) -> TokenStream {
}

#[derive(Debug, PartialEq, Eq, Clone)]
struct JavaDefinitions {}
struct JavaDefinition {
class: Ident,
}

#[derive(Debug, PartialEq, Eq, Clone)]
struct JavaDefinitions {
definitions: Vec<JavaDefinition>,
}

fn parse_java_definition(_input: TokenStream) -> JavaDefinitions {
JavaDefinitions {}
fn parse_java_definition(input: TokenStream) -> JavaDefinitions {
let definitions = input.clone().into_iter().collect::<Vec<_>>();
let definitions = definitions
.split(is_definition)
.filter(|tokens| !tokens.is_empty())
.map(|header| {
if header.len() < 2 {
panic!("Expected a class definition, got {:?}.", header);
}

let (token, header) = header.split_first().unwrap();
if !is_identifier(&token, "class") {
panic!("Expected \"class\", got {:?}.", token);
}

let (class, _) = header.split_first().unwrap();
let class = match class.clone() {
TokenTree::Ident(identifier) => identifier,
token => panic!("Expected an identifier, got {:?}.", token),
};
JavaDefinition { class }
})
.collect();
JavaDefinitions { definitions }
}

fn is_identifier(token: &TokenTree, name: &str) -> bool {
match token {
TokenTree::Ident(identifier) => identifier == name,
_ => false,
}
}

fn is_definition(token: &TokenTree) -> bool {
match token {
TokenTree::Group(group) => group.delimiter() == Delimiter::Brace,
_ => false,
}
}

#[cfg(test)]
Expand All @@ -34,15 +77,100 @@ mod parse_tests {
#[test]
fn empty() {
let input = quote!{};
assert_eq!(parse_java_definition(input), JavaDefinitions {});
assert_eq!(
parse_java_definition(input),
JavaDefinitions {
definitions: vec![],
}
);
}

#[test]
fn one() {
let input = quote!{
class TestClass1 {}
};
assert_eq!(
parse_java_definition(input),
JavaDefinitions {
definitions: vec![JavaDefinition {
class: Ident::new("TestClass1", Span::call_site()),
}],
}
);
}

#[test]
fn multiple() {
let input = quote!{
class TestClass1 {}
class TestClass2 {}
};
assert_eq!(
parse_java_definition(input),
JavaDefinitions {
definitions: vec![
JavaDefinition {
class: Ident::new("TestClass1", Span::call_site()),
},
JavaDefinition {
class: Ident::new("TestClass2", Span::call_site()),
},
],
}
);
}

#[test]
#[should_panic(expected = "Expected \"class\"")]
fn invalid_definition_kind() {
let input = quote!{
class test {}
invalid 1
};
parse_java_definition(input);
}

#[test]
#[should_panic(expected = "Expected a class definition")]
fn too_few_tokens() {
let input = quote!{
class test {}
invalid
};
parse_java_definition(input);
}

#[test]
#[should_panic(expected = "Expected an identifier")]
fn definition_name_not_identifier() {
let input = quote!{
class 1 {}
};
parse_java_definition(input);
}
}

#[derive(Debug, PartialEq, Eq, Clone)]
struct GeneratorDefinition {
class: Ident,
}

#[derive(Debug, PartialEq, Eq, Clone)]
struct GeneratorData {}
struct GeneratorData {
definitions: Vec<GeneratorDefinition>,
}

fn to_generator_data(_definitions: JavaDefinitions) -> GeneratorData {
GeneratorData {}
fn to_generator_data(definitions: JavaDefinitions) -> GeneratorData {
GeneratorData {
definitions: definitions
.definitions
.into_iter()
.map(|definition| GeneratorDefinition {
class: definition.class,
})
.collect(),
}
}

#[cfg(test)]
Expand All @@ -51,12 +179,74 @@ mod to_generator_data_tests {

#[test]
fn empty() {
assert_eq!(to_generator_data(JavaDefinitions {}), GeneratorData {});
assert_eq!(
to_generator_data(JavaDefinitions {
definitions: vec![],
}),
GeneratorData {
definitions: vec![],
}
);
}

#[test]
fn one() {
assert_eq!(
to_generator_data(JavaDefinitions {
definitions: vec![JavaDefinition {
class: Ident::new("test1", Span::call_site()),
}],
}),
GeneratorData {
definitions: vec![GeneratorDefinition {
class: Ident::new("test1", Span::call_site()),
}],
}
);
}

#[test]
fn multiple() {
assert_eq!(
to_generator_data(JavaDefinitions {
definitions: vec![
JavaDefinition {
class: Ident::new("test1", Span::call_site()),
},
JavaDefinition {
class: Ident::new("test2", Span::call_site()),
},
],
}),
GeneratorData {
definitions: vec![
GeneratorDefinition {
class: Ident::new("test1", Span::call_site()),
},
GeneratorDefinition {
class: Ident::new("test2", Span::call_site()),
},
],
}
);
}
}

fn generate(_data: GeneratorData) -> TokenStream {
TokenStream::new()
fn generate(data: GeneratorData) -> TokenStream {
let mut tokens = TokenStream::new();
for definition in data.definitions {
tokens.extend(generate_definition(definition));
}
tokens
}

fn generate_definition(definition: GeneratorDefinition) -> TokenStream {
let GeneratorDefinition { class, .. } = definition;
quote! {
#[derive(Debug)]
pub struct #class {
}
}
}

#[cfg(test)]
Expand All @@ -65,8 +255,50 @@ mod generate_tests {

#[test]
fn empty() {
let input = GeneratorData {
definitions: vec![],
};
let expected = quote!{};
assert_tokens_equals(generate(GeneratorData {}), expected);
assert_tokens_equals(generate(input), expected);
}

#[test]
fn one() {
let input = GeneratorData {
definitions: vec![GeneratorDefinition {
class: Ident::new("test1", Span::call_site()),
}],
};
let expected = quote!{
#[derive(Debug)]
pub struct test1 {
}
};
assert_tokens_equals(generate(input), expected);
}

#[test]
fn multiple() {
let input = GeneratorData {
definitions: vec![
GeneratorDefinition {
class: Ident::new("test1", Span::call_site()),
},
GeneratorDefinition {
class: Ident::new("test2", Span::call_site()),
},
],
};
let expected = quote!{
#[derive(Debug)]
pub struct test1 {
}

#[derive(Debug)]
pub struct test2 {
}
};
assert_tokens_equals(generate(input), expected);
}
}

Expand All @@ -80,6 +312,37 @@ mod java_generate_tests {
let expected = quote!{};
assert_tokens_equals(java_generate_impl(input), expected);
}

#[test]
fn one() {
let input = quote!{
class TestClass1 {}
};
let expected = quote!{
#[derive(Debug)]
pub struct TestClass1 {
}
};
assert_tokens_equals(java_generate_impl(input), expected);
}

#[test]
fn multiple() {
let input = quote!{
class TestClass1 {}
class TestClass2 {}
};
let expected = quote!{
#[derive(Debug)]
pub struct TestClass1 {
}

#[derive(Debug)]
pub struct TestClass2 {
}
};
assert_tokens_equals(java_generate_impl(input), expected);
}
}

#[cfg(test)]
Expand Down
6 changes: 5 additions & 1 deletion generator/tests/test.rs
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Original file line number Diff line number Diff line change
@@ -1,11 +1,15 @@
#![allow(dead_code)]
extern crate rust_jni_generator;

#[cfg(test)]
mod tests {
#[allow(unused_imports)]
use rust_jni_generator::*;

java_generate!{}
java_generate!{
class TestClass1 {}
class TestClass2 {}
}

#[test]
fn test() {}
Expand Down