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use alloc::{borrow::ToOwned, string::String};
use super::invoke::{Identity, Invoke};
use crate::elements;
pub struct ImportBuilder<F=Identity> {
callback: F,
module: String,
field: String,
binding: elements::External,
}
impl ImportBuilder {
pub fn new() -> Self {
ImportBuilder::with_callback(Identity)
}
}
impl<F> ImportBuilder<F> {
pub fn with_callback(callback: F) -> Self {
ImportBuilder {
callback: callback,
module: String::new(),
field: String::new(),
binding: elements::External::Function(0),
}
}
pub fn module(mut self, name: &str) -> Self {
self.module = name.to_owned();
self
}
pub fn field(mut self, name: &str) -> Self {
self.field = name.to_owned();
self
}
pub fn path(self, module: &str, field: &str) -> Self {
self.module(module).field(field)
}
pub fn with_external(mut self, external: elements::External) -> Self {
self.binding = external;
self
}
pub fn external(self) -> ImportExternalBuilder<Self> {
ImportExternalBuilder::with_callback(self)
}
}
impl<F> ImportBuilder<F> where F: Invoke<elements::ImportEntry> {
pub fn build(self) -> F::Result {
self.callback.invoke(elements::ImportEntry::new(self.module, self.field, self.binding))
}
}
impl<F> Invoke<elements::External> for ImportBuilder<F> {
type Result = Self;
fn invoke(self, val: elements::External) -> Self {
self.with_external(val)
}
}
pub struct ImportExternalBuilder<F=Identity> {
callback: F,
binding: elements::External,
}
impl<F> ImportExternalBuilder<F> where F: Invoke<elements::External> {
pub fn with_callback(callback: F) -> Self {
ImportExternalBuilder{
callback: callback,
binding: elements::External::Function(0),
}
}
pub fn func(mut self, index: u32) -> F::Result {
self.binding = elements::External::Function(index);
self.callback.invoke(self.binding)
}
pub fn memory(mut self, min: u32, max: Option<u32>) -> F::Result {
self.binding = elements::External::Memory(elements::MemoryType::new(min, max));
self.callback.invoke(self.binding)
}
pub fn table(mut self, min: u32, max: Option<u32>) -> F::Result {
self.binding = elements::External::Table(elements::TableType::new(min, max));
self.callback.invoke(self.binding)
}
pub fn global(mut self, value_type: elements::ValueType, is_mut: bool) -> F::Result {
self.binding = elements::External::Global(elements::GlobalType::new(value_type, is_mut));
self.callback.invoke(self.binding)
}
}
pub fn import() -> ImportBuilder {
ImportBuilder::new()
}
#[cfg(test)]
mod tests {
use super::import;
#[test]
fn example() {
let entry = import().module("env").field("memory").external().memory(256, Some(256)).build();
assert_eq!(entry.module(), "env");
assert_eq!(entry.field(), "memory");
}
}