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use super::{
CORE_FUNCTION_SORT, CORE_GLOBAL_SORT, CORE_MEMORY_SORT, CORE_TABLE_SORT, CORE_TAG_SORT,
};
use crate::{encode_section, Encode, Section, SectionId};
/// Represents the kind of an export from a WebAssembly module.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
#[repr(u8)]
pub enum ExportKind {
/// The export is a function.
Func = CORE_FUNCTION_SORT,
/// The export is a table.
Table = CORE_TABLE_SORT,
/// The export is a memory.
Memory = CORE_MEMORY_SORT,
/// The export is a global.
Global = CORE_GLOBAL_SORT,
/// The export is a tag.
Tag = CORE_TAG_SORT,
}
impl Encode for ExportKind {
fn encode(&self, sink: &mut Vec<u8>) {
sink.push(*self as u8);
}
}
#[cfg(feature = "wasmparser")]
impl From<wasmparser::ExternalKind> for ExportKind {
fn from(external_kind: wasmparser::ExternalKind) -> Self {
match external_kind {
wasmparser::ExternalKind::Func => ExportKind::Func,
wasmparser::ExternalKind::Table => ExportKind::Table,
wasmparser::ExternalKind::Memory => ExportKind::Memory,
wasmparser::ExternalKind::Global => ExportKind::Global,
wasmparser::ExternalKind::Tag => ExportKind::Tag,
}
}
}
/// An encoder for the export section of WebAssembly module.
///
/// # Example
///
/// ```rust
/// use wasm_encoder::{Module, ExportSection, ExportKind};
///
/// let mut exports = ExportSection::new();
/// exports.export("foo", ExportKind::Func, 0);
///
/// let mut module = Module::new();
/// module.section(&exports);
///
/// let bytes = module.finish();
/// ```
#[derive(Clone, Debug, Default)]
pub struct ExportSection {
bytes: Vec<u8>,
num_added: u32,
}
impl ExportSection {
/// Create a new export section encoder.
pub fn new() -> Self {
Self::default()
}
/// The number of exports in the section.
pub fn len(&self) -> u32 {
self.num_added
}
/// Determines if the section is empty.
pub fn is_empty(&self) -> bool {
self.num_added == 0
}
/// Define an export in the export section.
pub fn export(&mut self, name: &str, kind: ExportKind, index: u32) -> &mut Self {
name.encode(&mut self.bytes);
kind.encode(&mut self.bytes);
index.encode(&mut self.bytes);
self.num_added += 1;
self
}
}
impl Encode for ExportSection {
fn encode(&self, sink: &mut Vec<u8>) {
encode_section(sink, self.num_added, &self.bytes);
}
}
impl Section for ExportSection {
fn id(&self) -> u8 {
SectionId::Export.into()
}
}