Lawrence Bethlenfalvy
aebbf51228
- fixed lots of bugs - overlay libraries work correctly and reliably - the STL is an overlay library - examples updated
94 lines
3.1 KiB
Rust
94 lines
3.1 KiB
Rust
use chumsky::prelude::*;
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use chumsky::Parser;
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use itertools::Itertools;
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use super::context::Context;
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use super::decls::{SimpleParser, SimpleRecursive};
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use super::enum_filter::enum_filter;
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use super::lexer::{filter_map_lex, Lexeme};
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use super::Entry;
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use crate::interner::Tok;
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use crate::representations::sourcefile::Import;
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use crate::utils::iter::{
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box_chain, box_flatten, box_once, into_boxed_iter, BoxedIterIter,
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};
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/// initialize an iterator of iterator with a single element.
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fn init_table(name: Tok<String>) -> BoxedIterIter<'static, Tok<String>> {
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box_once(box_once(name))
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}
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/// Parse an import command
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/// Syntax is same as Rust's `use` except the verb is import, no trailing
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/// semi and the delimiters are plain parentheses. Namespaces should
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/// preferably contain crossplatform filename-legal characters but the
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/// symbols are explicitly allowed to go wild.
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/// There's a blacklist in [crate::parse::name::NOT_NAME_CHAR]
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pub fn import_parser<'a>(
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ctx: impl Context + 'a,
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) -> impl SimpleParser<Entry, Vec<Import>> + 'a {
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// TODO: this algorithm isn't cache friendly and copies a lot
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recursive({
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let ctx = ctx.clone();
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move |expr: SimpleRecursive<Entry, BoxedIterIter<Tok<String>>>| {
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filter_map_lex(enum_filter!(Lexeme::Name))
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.map(|(t, _)| t)
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.separated_by(Lexeme::NS.parser())
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.then(
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Lexeme::NS
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.parser()
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.ignore_then(choice((
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expr
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.clone()
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.separated_by(Lexeme::Name(ctx.interner().i(",")).parser())
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.delimited_by(
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Lexeme::LP('(').parser(),
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Lexeme::RP('(').parser(),
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)
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.map(|v| box_flatten(v.into_iter()))
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.labelled("import group"),
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// Each expr returns a list of imports, flatten into common list
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Lexeme::Name(ctx.interner().i("*"))
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.parser()
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.map(move |_| init_table(ctx.interner().i("*")))
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.labelled("wildcard import"), // Just a *, wrapped
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filter_map_lex(enum_filter!(Lexeme::Name))
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.map(|(t, _)| init_table(t))
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.labelled("import terminal"), // Just a name, wrapped
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)))
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.or_not(),
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)
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.map(
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|(name, opt_post): (
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Vec<Tok<String>>,
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Option<BoxedIterIter<Tok<String>>>,
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)|
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-> BoxedIterIter<Tok<String>> {
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if let Some(post) = opt_post {
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Box::new(
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post.map(move |el| box_chain!(name.clone().into_iter(), el)),
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)
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} else {
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box_once(into_boxed_iter(name))
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}
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},
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)
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}
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})
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.map(move |paths| {
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paths
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.filter_map(|namespaces| {
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let mut path = namespaces.collect_vec();
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let name = path.pop()?;
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Some(Import {
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path: ctx.interner().i(&path),
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name: {
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if name == ctx.interner().i("*") { None } else { Some(name) }
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},
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})
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})
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.collect()
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})
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.labelled("import")
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}
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