use crate::{
load_initial_config, macro_metadata, BindingGenerator, Component, ComponentInterface,
GenerationSettings, Result,
};
use anyhow::{bail, Context};
use camino::Utf8Path;
use cargo_metadata::{MetadataCommand, Package};
use std::{collections::HashMap, fs};
use uniffi_meta::{
create_metadata_groups, fixup_external_type, group_metadata, Metadata, MetadataGroup,
};
pub fn generate_bindings<T: BindingGenerator + ?Sized>(
library_path: &Utf8Path,
crate_name: Option<String>,
binding_generator: &T,
config_file_override: Option<&Utf8Path>,
out_dir: &Utf8Path,
try_format_code: bool,
) -> Result<Vec<Component<T::Config>>> {
let cargo_metadata = MetadataCommand::new()
.exec()
.context("error running cargo metadata")?;
let mut components = find_components(&cargo_metadata, library_path)?
.into_iter()
.map(|(ci, package)| {
let crate_root = package
.manifest_path
.parent()
.context("manifest path has no parent")?;
let config = binding_generator
.new_config(&load_initial_config(crate_root, config_file_override)?)?;
Ok(Component {
ci,
config,
package_name: Some(package.name),
})
})
.collect::<Result<Vec<_>>>()?;
let settings = GenerationSettings {
out_dir: out_dir.to_owned(),
try_format_code,
cdylib: calc_cdylib_name(library_path).map(ToOwned::to_owned),
};
binding_generator.update_component_configs(&settings, &mut components)?;
fs::create_dir_all(out_dir)?;
if let Some(crate_name) = &crate_name {
let old_elements = components.drain(..);
let mut matches: Vec<_> = old_elements
.filter(|s| s.ci.crate_name() == crate_name)
.collect();
match matches.len() {
0 => bail!("Crate {crate_name} not found in {library_path}"),
1 => components.push(matches.pop().unwrap()),
n => bail!("{n} crates named {crate_name} found in {library_path}"),
}
}
binding_generator.write_bindings(&settings, &components)?;
Ok(components)
}
pub fn calc_cdylib_name(library_path: &Utf8Path) -> Option<&str> {
let cdylib_extensions = [".so", ".dll", ".dylib"];
let filename = library_path.file_name()?;
let filename = filename.strip_prefix("lib").unwrap_or(filename);
for ext in cdylib_extensions {
if let Some(f) = filename.strip_suffix(ext) {
return Some(f);
}
}
None
}
fn find_components(
cargo_metadata: &cargo_metadata::Metadata,
library_path: &Utf8Path,
) -> Result<Vec<(ComponentInterface, Package)>> {
let items = macro_metadata::extract_from_library(library_path)?;
let mut metadata_groups = create_metadata_groups(&items);
group_metadata(&mut metadata_groups, items)?;
let mut udl_items: HashMap<String, MetadataGroup> = HashMap::new();
for group in metadata_groups.values() {
let package = find_package_by_crate_name(cargo_metadata, &group.namespace.crate_name)?;
let crate_root = package
.manifest_path
.parent()
.context("manifest path has no parent")?;
let crate_name = group.namespace.crate_name.clone();
if let Some(mut metadata_group) = load_udl_metadata(group, crate_root, &crate_name)? {
metadata_group.items = metadata_group
.items
.into_iter()
.map(|item| fixup_external_type(item, &metadata_groups))
.filter(|item| !matches!(item, Metadata::UniffiTrait { .. }))
.collect();
udl_items.insert(crate_name, metadata_group);
};
}
metadata_groups
.into_values()
.map(|group| {
let package = find_package_by_crate_name(cargo_metadata, &group.namespace.crate_name)?;
let mut ci = ComponentInterface::new(&group.namespace.crate_name);
if let Some(metadata) = udl_items.remove(&group.namespace.crate_name) {
ci.add_metadata(metadata)?;
};
ci.add_metadata(group)?;
Ok((ci, package))
})
.collect()
}
fn find_package_by_crate_name(
metadata: &cargo_metadata::Metadata,
crate_name: &str,
) -> Result<Package> {
let matching: Vec<&Package> = metadata
.packages
.iter()
.filter(|p| {
p.targets
.iter()
.any(|t| t.name.replace('-', "_") == crate_name)
})
.collect();
match matching.len() {
1 => Ok(matching[0].clone()),
n => bail!("cargo metadata returned {n} packages for crate name {crate_name}"),
}
}
fn load_udl_metadata(
group: &MetadataGroup,
crate_root: &Utf8Path,
crate_name: &str,
) -> Result<Option<MetadataGroup>> {
let udl_items = group
.items
.iter()
.filter_map(|i| match i {
uniffi_meta::Metadata::UdlFile(meta) => Some(meta),
_ => None,
})
.collect::<Vec<_>>();
match udl_items.len() {
0 => Ok(None),
1 => {
if udl_items[0].module_path != crate_name {
bail!(
"UDL is for crate '{}' but this crate name is '{}'",
udl_items[0].module_path,
crate_name
);
}
let ci_name = &udl_items[0].file_stub;
let ci_path = crate_root.join("src").join(format!("{ci_name}.udl"));
if ci_path.exists() {
let udl = fs::read_to_string(ci_path)?;
let udl_group = uniffi_udl::parse_udl(&udl, crate_name)?;
Ok(Some(udl_group))
} else {
bail!("{ci_path} not found");
}
}
n => bail!("{n} UDL files found for {crate_root}"),
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn calc_cdylib_name_is_correct() {
assert_eq!(
"uniffi",
calc_cdylib_name("/path/to/libuniffi.so".into()).unwrap()
);
assert_eq!(
"uniffi",
calc_cdylib_name("/path/to/libuniffi.dylib".into()).unwrap()
);
assert_eq!(
"uniffi",
calc_cdylib_name("/path/to/uniffi.dll".into()).unwrap()
);
}
#[test]
#[ignore] fn calc_cdylib_name_is_correct_on_windows() {
assert_eq!(
"libuniffi",
calc_cdylib_name("/path/to/libuniffi.dll".into()).unwrap()
);
}
}