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use std::rc::Rc;
use std::borrow::Cow;
use std::collections::{HashSet, VecDeque, LinkedList};
use std::iter::FromIterator;
use std::vec;
use crate::backend;
use crate::compiler::data::*;
use crate::frontend::ast::*;
pub fn to_unnormalized_backend_ir<'a>(children: Vec<Node<'a>>) -> Vec<crate::backend::ast::Ast<'a>> {
use crate::backend;
let mut results: Vec<backend::Ast> = Default::default();
for child in children {
let last = {
let mut valid_left_pos = None;
for ix in (0..results.len()).rev() {
let leftward = results
.get(ix)
.filter(|x| !x.is_whitespace());
if valid_left_pos.is_none() && leftward.is_some() {
valid_left_pos = Some(ix);
break;
}
}
if let Some(ix) = valid_left_pos {
results.get_mut(ix)
} else {
None
}
};
let last_is_ident = last.as_ref().map(|x| x.is_ident()).unwrap_or(false);
let last_is_tag = last.as_ref().map(|x| x.is_tag()).unwrap_or(false);
let new_child = match child {
Node::Enclosure(node) if last_is_ident && node.data.is_square_parens() => {
let last = last.unwrap();
let mut name = last.clone().into_ident().unwrap();
let parameters = to_unnormalized_backend_ir(node.data.children);
let new_node = backend::Ast::Tag(backend::Tag {
name,
parameters: Some(parameters),
children: Vec::new(),
rewrite_rules: Vec::new(),
});
*last = new_node;
None
}
Node::Enclosure(node) if last_is_ident && node.data.is_curly_brace() => {
let last = last.unwrap();
let mut name = last.clone().into_ident().unwrap();
let children = to_unnormalized_backend_ir(node.data.children);
let new_node = backend::Ast::Tag(backend::Tag {
name,
parameters: None,
children: vec![
backend::ast::Ast::Enclosure(
backend::Enclosure {
kind: backend::EnclosureKind::CurlyBrace,
children,
}
)
],
rewrite_rules: Vec::new(),
});
*last = new_node;
None
}
Node::Enclosure(node) if last_is_tag && node.data.is_curly_brace() => {
let tag = last.unwrap();
let children = to_unnormalized_backend_ir(node.data.children);
tag.unpack_tag_mut()
.unwrap()
.children.push(backend::ast::Ast::Enclosure(
backend::Enclosure {
kind: backend::EnclosureKind::CurlyBrace,
children,
}
));
None
}
Node::Enclosure(node) => {
let children = to_unnormalized_backend_ir(node.data.children);
let new_node = backend::Ast::Enclosure(Enclosure{
kind: node.data.kind,
children,
});
Some(new_node)
}
Node::Ident(node) => {
let new_node = backend::Ast::Ident(node.data);
Some(new_node)
}
Node::InvalidToken(node) => {
let new_node = backend::Ast::Token(node.data);
Some(new_node)
}
Node::String(node) => {
let mut is_token = false;
for sym in crate::compiler::data::TOKEN_SET {
if *sym == &node.data {
is_token = true;
break;
}
}
if is_token {
Some(backend::Ast::Token(node.data))
} else {
Some(backend::Ast::Content(node.data))
}
}
};
if let Some(new_child) = new_child {
results.push(new_child);
}
}
results
}
fn into_rewrite_rules<'a>(
children: Vec<backend::Ast<'a>>
) -> Vec<backend::RewriteRule<backend::Ast<'a>>> {
let mut results = Vec::new();
for ix in 0..children.len() {
if ix == 0 {
continue;
}
let left = children.get(ix - 1);
let current = children
.get(ix)
.and_then(|x| x.unpack_token())
.filter(|x| *x == "=>");
let right = children.get(ix + 1);
match (left, current, right) {
(Some(left), Some(_), Some(right)) => {
results.push(backend::RewriteRule {
from: left.clone(),
to: right.clone(),
})
}
_ => ()
}
}
results
}
pub fn normalize_ir<'a>(children: Vec<backend::Ast<'a>>) -> Vec<backend::Ast<'a>> {
let mut results = Vec::new();
for child in children {
if child.is_named_block("!where") {
let child = child.into_tag().unwrap();
let last = results
.last_mut()
.and_then(backend::Ast::unpack_tag_mut);
if let Some(last) = last {
let rewrite_rule = into_rewrite_rules(
child.children,
);
last.rewrite_rules.extend(rewrite_rule);
continue;
}
} else {
results.push(child);
}
}
results
}