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add export keyword

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This commit is contained in:
minneelyyyy
2024-10-19 22:13:41 -04:00
parent 5a8354f1ad
commit 3027ef4820
6 changed files with 103 additions and 55 deletions
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73
src/parser.rs
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@@ -1,7 +1,10 @@
use crate::executor::Executor;
use super::{Value, Type, Function, FunctionType};
use super::tokenizer::{Token, TokenizeError, Op};
use std::borrow::{BorrowMut, Cow};
use std::error;
use std::collections::HashMap;
use std::fmt::Display;
@@ -90,31 +93,32 @@ pub(crate) enum ParseTree {
// Misc
Print(Box<ParseTree>),
Nop,
Export(Vec<String>),
}
/// Parses input tokens and produces ParseTrees for an Executor
pub(crate) struct Parser<'a, I: Iterator<Item = Result<Token, TokenizeError>>> {
tokens: &'a mut Peekable<I>,
globals: HashMap<String, Type>,
globals: &'a mut HashMap<String, Type>,
locals: HashMap<String, Type>,
}
impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
pub fn new(tokens: &'a mut Peekable<I>) -> Self {
pub fn new(tokens: &'a mut Peekable<I>, globals: &'a mut HashMap<String, Type>) -> Self {
Self {
tokens: tokens,
globals: HashMap::new(),
globals,
locals: HashMap::new()
}
}
pub fn globals(mut self, globals: HashMap<String, Type>) -> Self {
self.globals = globals;
pub fn add_global(self, k: String, v: Type) -> Self {
self.globals.insert(k, v);
self
}
pub fn _add_global(mut self, k: String, v: Type) -> Self {
self.globals.insert(k, v);
pub fn add_globals<Items: Iterator<Item = (String, Type)>>(self, items: Items) -> Self {
items.for_each(|(name, t)| _ = self.globals.insert(name, t));
self
}
@@ -128,11 +132,20 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
self
}
pub fn add_locals<Items: Iterator<Item = (String, Type)>>(mut self, items: Items) -> Self {
items.for_each(|(name, t)| _ = self.locals.insert(name, t));
self
}
fn get_object_type(&self, ident: &String) -> Result<&Type, ParseError> {
self.locals.get(ident).or(self.globals.get(ident))
.ok_or(ParseError::IdentifierUndefined(ident.clone()))
}
fn get_object_types<Names: Iterator<Item = String>>(&self, items: Names) -> impl Iterator<Item = Result<&Type, ParseError>> {
items.map(|x| self.get_object_type(&x))
}
fn parse(&mut self) -> Result<ParseTree, ParseError> {
match self.tokens.next().ok_or(ParseError::NoInput)?.map_err(|e| ParseError::TokenizeError(e))? {
Token::Constant(c) => Ok(ParseTree::Constant(c)),
@@ -165,18 +178,16 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
if let Token::Identifier(ident) = token {
match op {
Op::Equ => Ok(ParseTree::Equ(ident.clone(),
body.clone(),
Box::new(Parser::new(self.tokens.by_ref())
body,
Box::new(Parser::new(self.tokens.by_ref(), self.globals.borrow_mut())
.locals(self.locals.clone())
.globals(self.globals.clone())
.add_local(ident, Type::Any)
.parse()?))
),
Op::LazyEqu => Ok(ParseTree::LazyEqu(ident.clone(),
body.clone(),
Box::new(Parser::new(self.tokens.by_ref())
body,
Box::new(Parser::new(self.tokens.by_ref(), self.globals.borrow_mut())
.locals(self.locals.clone())
.globals(self.globals.clone())
.add_local(ident, Type::Any)
.parse()?))
),
@@ -191,8 +202,7 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
Ok(ParseTree::FunctionDefinition(f.clone(),
Box::new(
Parser::new(self.tokens)
.globals(self.globals.clone())
Parser::new(self.tokens, self.globals.borrow_mut())
.locals(self.locals.clone())
.add_local(f.name().unwrap().to_string(), Type::Function(f.get_type()))
.parse()?
@@ -237,8 +247,7 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
.into_iter()
.peekable();
let trees: Vec<ParseTree> = Parser::new(&mut array_tokens)
.globals(self.globals.to_owned())
let trees: Vec<ParseTree> = Parser::new(&mut array_tokens, self.globals.borrow_mut())
.locals(self.locals.to_owned())
.collect::<Result<_, ParseError>>()?;
@@ -273,8 +282,7 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
.into_iter()
.peekable();
let trees: Vec<ParseTree> = Parser::new(&mut tokens)
.globals(self.globals.to_owned())
let trees: Vec<ParseTree> = Parser::new(&mut tokens, self.globals.borrow_mut())
.locals(self.locals.to_owned())
.collect::<Result<_, ParseError>>()?;
@@ -302,6 +310,27 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
Op::Tail => Ok(ParseTree::Tail(Box::new(self.parse()?))),
Op::Init => Ok(ParseTree::Init(Box::new(self.parse()?))),
Op::Fini => Ok(ParseTree::Fini(Box::new(self.parse()?))),
Op::Export => {
let list = self.parse()?;
let mut g = HashMap::new();
let list = Executor::new(&mut vec![Ok(list)].into_iter(), &mut g).next().unwrap().map_err(|_| ParseError::NoInput)?;
if let Value::Array(Type::String, items) = list {
let names = items.into_iter().map(|x| match x {
Value::String(s) => s,
_ => unreachable!(),
});
for name in names.clone() {
let t = self.locals.remove(&name).ok_or(ParseError::IdentifierUndefined(name.clone()))?;
self.globals.insert(name, t);
}
Ok(ParseTree::Export(names.collect()))
} else {
Err(ParseError::NoInput)
}
}
op => Err(ParseError::UnwantedToken(Token::Operator(op))),
}
}
@@ -319,8 +348,7 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
}
Ok(Function::lambda(t, args, Box::new(
Parser::new(self.tokens)
.globals(self.globals.clone())
Parser::new(self.tokens, &mut self.globals)
.locals(locals).parse()?)))
}
@@ -337,8 +365,7 @@ impl<'a, I: Iterator<Item = Result<Token, TokenizeError>>> Parser<'a, I> {
locals.insert(name.clone(), Type::Function(t.clone()));
Ok(Function::named(&name, t, args, Box::new(
Parser::new(self.tokens)
.globals(self.globals.clone())
Parser::new(self.tokens, &mut self.globals)
.locals(locals).parse()?)))
}