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Merge branch 'nushell:main' into main

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This commit is contained in:
Justin
2021-10-10 13:15:54 -07:00
committed by GitHub
parent ecee5a9845 89267df9eb
commit 7cafdc9675
3 changed files with 103 additions and 40 deletions
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6
crates/nu-parser/src/parse_keywords.rs
View File

@ -110,8 +110,10 @@ pub fn parse_def(
*declaration = signature.into_block_command(block_id);
} else {
error = error.or_else(|| {
// TODO: Add InternalError variant
Some(ParseError::UnknownState(
"Could not define hidden command".into(),
"Internal error: Predeclaration failed to add declaration"
.into(),
spans[1],
))
});
@ -318,7 +320,7 @@ pub fn parse_module(
spans: &[Span],
) -> (Statement, Option<ParseError>) {
// TODO: Currently, module is closing over its parent scope (i.e., defs in the parent scope are
// visible and usable in this module's scope). We might want to disable that. How?
// visible and usable in this module's scope). We want to disable that for files.
let mut error = None;
let bytes = working_set.get_span_contents(spans[0]);

119
crates/nu-protocol/src/engine/engine_state.rs
View File

@ -1,10 +1,7 @@
use super::Command;
use crate::{ast::Block, BlockId, DeclId, Example, Signature, Span, Type, VarId};
use core::panic;
use std::{
collections::{HashMap, HashSet},
slice::Iter,
};
use std::{collections::HashMap, slice::Iter};
pub struct EngineState {
files: Vec<(String, usize, usize)>,
@ -15,23 +12,66 @@ pub struct EngineState {
pub scope: Vec<ScopeFrame>,
}
// Tells whether a decl etc. is visible or not
// TODO: When adding new exportables (env vars, aliases, etc.), parametrize the ID type with generics
#[derive(Debug, Clone)]
struct Visibility {
ids: HashMap<DeclId, bool>,
}
impl Visibility {
fn new() -> Self {
Visibility {
ids: HashMap::new(),
}
}
fn is_id_visible(&self, id: &DeclId) -> bool {
*self.ids.get(id).unwrap_or(&true) // by default it's visible
}
fn hide_id(&mut self, id: &DeclId) {
self.ids.insert(*id, false);
}
fn use_id(&mut self, id: &DeclId) {
self.ids.insert(*id, true);
}
fn merge_with(&mut self, other: Visibility) {
// overwrite own values with the other
self.ids.extend(other.ids);
}
fn append(&mut self, other: &Visibility) {
// take new values from other but keep own values
for (id, visible) in other.ids.iter() {
if !self.ids.contains_key(id) {
self.ids.insert(*id, *visible);
}
}
}
}
#[derive(Debug)]
pub struct ScopeFrame {
pub vars: HashMap<Vec<u8>, VarId>,
predecls: HashMap<Vec<u8>, DeclId>, // temporary storage for predeclarations
decls: HashMap<Vec<u8>, DeclId>,
aliases: HashMap<Vec<u8>, Vec<Span>>,
modules: HashMap<Vec<u8>, BlockId>,
hiding: HashSet<DeclId>,
visibility: Visibility,
}
impl ScopeFrame {
pub fn new() -> Self {
Self {
vars: HashMap::new(),
predecls: HashMap::new(),
decls: HashMap::new(),
aliases: HashMap::new(),
modules: HashMap::new(),
hiding: HashSet::new(),
visibility: Visibility::new(),
}
}
@ -86,9 +126,7 @@ impl EngineState {
for item in first.modules.into_iter() {
last.modules.insert(item.0, item.1);
}
for item in first.hiding.into_iter() {
last.hiding.insert(item);
}
last.visibility.merge_with(first.visibility);
}
}
@ -132,13 +170,13 @@ impl EngineState {
}
pub fn find_decl(&self, name: &[u8]) -> Option<DeclId> {
let mut hiding: HashSet<DeclId> = HashSet::new();
let mut visibility: Visibility = Visibility::new();
for scope in self.scope.iter().rev() {
hiding.extend(&scope.hiding);
visibility.append(&scope.visibility);
if let Some(decl_id) = scope.decls.get(name) {
if !hiding.contains(decl_id) {
if visibility.is_id_visible(decl_id) {
return Some(*decl_id);
}
}
@ -267,10 +305,9 @@ pub struct StateWorkingSet<'a> {
pub struct StateDelta {
files: Vec<(String, usize, usize)>,
pub(crate) file_contents: Vec<u8>,
vars: Vec<Type>, // indexed by VarId
decls: Vec<Box<dyn Command>>, // indexed by DeclId
blocks: Vec<Block>, // indexed by BlockId
predecls: HashMap<Vec<u8>, DeclId>, // this should get erased after every def call
vars: Vec<Type>, // indexed by VarId
decls: Vec<Box<dyn Command>>, // indexed by DeclId
blocks: Vec<Block>, // indexed by BlockId
pub scope: Vec<ScopeFrame>,
}
@ -304,7 +341,6 @@ impl<'a> StateWorkingSet<'a> {
file_contents: vec![],
vars: vec![],
decls: vec![],
predecls: HashMap::new(),
blocks: vec![],
scope: vec![ScopeFrame::new()],
},
@ -337,6 +373,7 @@ impl<'a> StateWorkingSet<'a> {
.expect("internal error: missing required scope frame");
scope_frame.decls.insert(name, decl_id);
scope_frame.visibility.use_id(&decl_id);
decl_id
}
@ -347,18 +384,25 @@ impl<'a> StateWorkingSet<'a> {
self.delta.decls.push(decl);
let decl_id = self.num_decls() - 1;
self.delta.predecls.insert(name, decl_id)
let scope_frame = self
.delta
.scope
.last_mut()
.expect("internal error: missing required scope frame");
scope_frame.predecls.insert(name, decl_id)
}
pub fn merge_predecl(&mut self, name: &[u8]) -> Option<DeclId> {
if let Some(decl_id) = self.delta.predecls.remove(name) {
let scope_frame = self
.delta
.scope
.last_mut()
.expect("internal error: missing required scope frame");
let scope_frame = self
.delta
.scope
.last_mut()
.expect("internal error: missing required scope frame");
if let Some(decl_id) = scope_frame.predecls.remove(name) {
scope_frame.decls.insert(name.into(), decl_id);
scope_frame.visibility.use_id(&decl_id);
return Some(decl_id);
}
@ -367,11 +411,11 @@ impl<'a> StateWorkingSet<'a> {
}
pub fn hide_decl(&mut self, name: &[u8]) -> Option<DeclId> {
let mut hiding: HashSet<DeclId> = HashSet::new();
let mut visibility: Visibility = Visibility::new();
// Since we can mutate scope frames in delta, remove the id directly
for scope in self.delta.scope.iter_mut().rev() {
hiding.extend(&scope.hiding);
visibility.append(&scope.visibility);
if let Some(decl_id) = scope.decls.remove(name) {
return Some(decl_id);
@ -386,12 +430,12 @@ impl<'a> StateWorkingSet<'a> {
.expect("internal error: missing required scope frame");
for scope in self.permanent_state.scope.iter().rev() {
hiding.extend(&scope.hiding);
visibility.append(&scope.visibility);
if let Some(decl_id) = scope.decls.get(name) {
if !hiding.contains(decl_id) {
if visibility.is_id_visible(decl_id) {
// Hide decl only if it's not already hidden
last_scope_frame.hiding.insert(*decl_id);
last_scope_frame.visibility.hide_id(decl_id);
return Some(*decl_id);
}
}
@ -432,6 +476,7 @@ impl<'a> StateWorkingSet<'a> {
for (name, decl_id) in overlay {
scope_frame.decls.insert(name, decl_id);
scope_frame.visibility.use_id(&decl_id);
}
}
@ -505,14 +550,14 @@ impl<'a> StateWorkingSet<'a> {
}
pub fn find_decl(&self, name: &[u8]) -> Option<DeclId> {
let mut hiding: HashSet<DeclId> = HashSet::new();
if let Some(decl_id) = self.delta.predecls.get(name) {
return Some(*decl_id);
}
let mut visibility: Visibility = Visibility::new();
for scope in self.delta.scope.iter().rev() {
hiding.extend(&scope.hiding);
visibility.append(&scope.visibility);
if let Some(decl_id) = scope.predecls.get(name) {
return Some(*decl_id);
}
if let Some(decl_id) = scope.decls.get(name) {
return Some(*decl_id);
@ -520,10 +565,10 @@ impl<'a> StateWorkingSet<'a> {
}
for scope in self.permanent_state.scope.iter().rev() {
hiding.extend(&scope.hiding);
visibility.append(&scope.visibility);
if let Some(decl_id) = scope.decls.get(name) {
if !hiding.contains(decl_id) {
if visibility.is_id_visible(decl_id) {
return Some(*decl_id);
}
}