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use std::borrow::Cow;
use super::*;
use crate::{encoding_size, ExportKind, NameMap, SectionId};
/// Encoding for the `component-name` custom section which assigns
/// human-readable names to items within a component.
#[derive(Clone, Debug, Default)]
pub struct ComponentNameSection {
bytes: Vec<u8>,
}
enum Subsection {
Component,
Decls,
}
impl ComponentNameSection {
/// Creates a new blank `name` custom section.
pub fn new() -> Self {
Self::default()
}
/// Appends a component name subsection to this section.
///
/// This will indicate that the name of the entire component should be the
/// `name` specified. Note that this should be encoded first before other
/// subsections.
pub fn component(&mut self, name: &str) {
let len = encoding_size(u32::try_from(name.len()).unwrap());
self.subsection_header(Subsection::Component, len + name.len());
name.encode(&mut self.bytes);
}
/// Appends a decls name subsection to name core functions within the
/// component.
pub fn core_funcs(&mut self, names: &NameMap) {
self.core_decls(ExportKind::Func as u8, names)
}
/// Appends a decls name subsection to name core tables within the
/// component.
pub fn core_tables(&mut self, names: &NameMap) {
self.core_decls(ExportKind::Table as u8, names)
}
/// Appends a decls name subsection to name core memories within the
/// component.
pub fn core_memories(&mut self, names: &NameMap) {
self.core_decls(ExportKind::Memory as u8, names)
}
/// Appends a decls name subsection to name core globals within the
/// component.
pub fn core_globals(&mut self, names: &NameMap) {
self.core_decls(ExportKind::Global as u8, names)
}
/// Appends a decls name subsection to name core types within the
/// component.
pub fn core_types(&mut self, names: &NameMap) {
self.core_decls(CORE_TYPE_SORT, names)
}
/// Appends a decls name subsection to name core modules within the
/// component.
pub fn core_modules(&mut self, names: &NameMap) {
self.core_decls(CORE_MODULE_SORT, names)
}
/// Appends a decls name subsection to name core instances within the
/// component.
pub fn core_instances(&mut self, names: &NameMap) {
self.core_decls(CORE_INSTANCE_SORT, names)
}
/// Appends a decls name subsection to name component functions within the
/// component.
pub fn funcs(&mut self, names: &NameMap) {
self.component_decls(FUNCTION_SORT, names)
}
/// Appends a decls name subsection to name component values within the
/// component.
pub fn values(&mut self, names: &NameMap) {
self.component_decls(VALUE_SORT, names)
}
/// Appends a decls name subsection to name component type within the
/// component.
pub fn types(&mut self, names: &NameMap) {
self.component_decls(TYPE_SORT, names)
}
/// Appends a decls name subsection to name components within the
/// component.
pub fn components(&mut self, names: &NameMap) {
self.component_decls(COMPONENT_SORT, names)
}
/// Appends a decls name subsection to name component instances within the
/// component.
pub fn instances(&mut self, names: &NameMap) {
self.component_decls(INSTANCE_SORT, names)
}
fn component_decls(&mut self, kind: u8, names: &NameMap) {
self.subsection_header(Subsection::Decls, 1 + names.size());
self.bytes.push(kind);
names.encode(&mut self.bytes);
}
fn core_decls(&mut self, kind: u8, names: &NameMap) {
self.subsection_header(Subsection::Decls, 2 + names.size());
self.bytes.push(CORE_SORT);
self.bytes.push(kind);
names.encode(&mut self.bytes);
}
fn subsection_header(&mut self, id: Subsection, len: usize) {
self.bytes.push(id as u8);
len.encode(&mut self.bytes);
}
/// Returns whether this section is empty, or nothing has been encoded.
pub fn is_empty(&self) -> bool {
self.bytes.is_empty()
}
/// View the encoded section as a CustomSection.
pub fn as_custom<'a>(&'a self) -> CustomSection<'a> {
CustomSection {
name: "component-name".into(),
data: Cow::Borrowed(&self.bytes),
}
}
}
impl Encode for ComponentNameSection {
fn encode(&self, sink: &mut Vec<u8>) {
self.as_custom().encode(sink);
}
}
impl ComponentSection for ComponentNameSection {
fn id(&self) -> u8 {
SectionId::Custom.into()
}
}