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use crate::component::Component;
use crate::core::{Module, ModuleField, ModuleKind};
use crate::kw;
use crate::parser::{Parse, Parser, Result};
use crate::token::Span;
/// A `*.wat` file parser, or a parser for one parenthesized module.
///
/// This is the top-level type which you'll frequently parse when working with
/// this crate. A `*.wat` file is either one `module` s-expression or a sequence
/// of s-expressions that are module fields.
#[derive(Debug)]
#[allow(missing_docs)]
pub enum Wat<'a> {
Module(Module<'a>),
Component(Component<'a>),
}
impl Wat<'_> {
fn validate(&self, parser: Parser<'_>) -> Result<()> {
match self {
Wat::Module(m) => m.validate(parser),
Wat::Component(c) => c.validate(parser),
}
}
/// Encodes this `Wat` to binary form. This calls either [`Module::encode`]
/// or [`Component::encode`].
pub fn encode(&mut self) -> std::result::Result<Vec<u8>, crate::Error> {
match self {
Wat::Module(m) => m.encode(),
Wat::Component(c) => c.encode(),
}
}
}
impl<'a> Parse<'a> for Wat<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
if !parser.has_meaningful_tokens() {
return Err(parser.error("expected at least one module field"));
}
let _r = parser.register_annotation("custom");
let _r = parser.register_annotation("producers");
let _r = parser.register_annotation("name");
let wat = if parser.peek2::<kw::module>()? {
Wat::Module(parser.parens(|parser| parser.parse())?)
} else if parser.peek2::<kw::component>()? {
Wat::Component(parser.parens(|parser| parser.parse())?)
} else {
let fields = ModuleField::parse_remaining(parser)?;
Wat::Module(Module {
span: Span { offset: 0 },
id: None,
name: None,
kind: ModuleKind::Text(fields),
})
};
wat.validate(parser)?;
Ok(wat)
}
}
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