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Introduce 'export' keyword

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This commit is contained in:
Jakub Žádník 2021-09-28 20:29:38 +03:00
parent 1b89ccf25b
commit 561feff365
1 changed files with 49 additions and 4 deletions
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53
crates/nu-parser/src/parse_keywords.rs
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@ -16,6 +16,13 @@ use crate::{
pub fn parse_def_predecl(working_set: &mut StateWorkingSet, spans: &[Span]) {
let name = working_set.get_span_contents(spans[0]);
// handle "export def" same as "def"
let (name, spans) = if name == b"export" && spans.len() >= 2 {
(working_set.get_span_contents(spans[1]), &spans[1..])
} else {
(name, spans)
};
if name == b"def" && spans.len() >= 4 {
let (name_expr, ..) = parse_string(working_set, spans[1]);
let name = name_expr.as_string();
@ -218,6 +225,38 @@ pub fn parse_alias(
)
}
pub fn parse_export(
working_set: &mut StateWorkingSet,
spans: &[Span],
) -> (Statement, Option<ParseError>) {
let bytes = working_set.get_span_contents(spans[0]);
if bytes == b"export" && spans.len() >= 3 {
let export_name = working_set.get_span_contents(spans[1]);
match export_name {
b"def" => parse_def(working_set, &spans[1..]),
_ => (
garbage_statement(spans),
Some(ParseError::Expected(
// TODO: Fill in more as they come
"def keyword".into(),
spans[1],
)),
),
}
} else {
(
garbage_statement(spans),
Some(ParseError::UnknownState(
// TODO: fill in more as they come
"Expected structure: export def [] {}".into(),
span(spans),
)),
)
}
}
pub fn parse_module(
working_set: &mut StateWorkingSet,
spans: &[Span],
@ -307,16 +346,21 @@ pub fn parse_module(
b"def" => {
let (stmt, err) = parse_def(working_set, &pipeline.commands[0].parts);
(stmt, err)
}
b"export" => {
let (stmt, err) =
parse_export(working_set, &pipeline.commands[0].parts);
if err.is_none() {
let decl_name =
// parts[1] is safe since it's checked in parse_def already
working_set.get_span_contents(pipeline.commands[0].parts[1]);
// parts[2] is safe since it's checked in parse_def already
working_set.get_span_contents(pipeline.commands[0].parts[2]);
let decl_id = working_set
.find_decl(decl_name)
.expect("internal error: failed to find added declaration");
// TODO: Later, we want to put this behind 'export'
exports.push((decl_name.into(), decl_id));
}
@ -325,7 +369,8 @@ pub fn parse_module(
_ => (
garbage_statement(&pipeline.commands[0].parts),
Some(ParseError::Expected(
"def".into(),
// TODO: Fill in more as they com
"def or export keyword".into(),
pipeline.commands[0].parts[0],
)),
),