lang: finish module/top level syntax

This commit is contained in:
Schrottkatze 2024-06-03 12:05:38 +02:00
parent 946ac879a7
commit 0de076ace1
Signed by: schrottkatze
SSH key fingerprint: SHA256:hXb3t1vINBFCiDCmhRABHX5ocdbLiKyCdKI4HK2Rbbc
4 changed files with 86 additions and 3 deletions

View file

@ -10,4 +10,6 @@ pub enum SyntaxError {
CommaInMatOrVec,
UnterminatedTopLevelItem,
UnclosedModuleBody,
UnfinishedPath,
PathSepContainsSemicolon,
}

View file

@ -20,6 +20,7 @@ pub fn mod_body(p: &mut Parser) {
fn mod_decl(p: &mut Parser) -> Option<CompletedMarker> {
let mod_start = p.start("module");
if !p.eat(MOD_KW) {
mod_start.abandon(p);
return None;
}
@ -54,7 +55,7 @@ pub fn top_level_item(p: &mut Parser) -> Option<CompletedMarker> {
if !TOP_LEVEL_ITEM_START.contains(p.current()) {
return None;
}
def(p).or_else(|| mod_decl(p))
def(p).or_else(|| mod_decl(p)).or_else(|| r#use(p))
}
fn def(p: &mut Parser) -> Option<CompletedMarker> {
@ -98,9 +99,81 @@ fn def(p: &mut Parser) -> Option<CompletedMarker> {
}
fn r#use(p: &mut Parser) -> Option<CompletedMarker> {
let use_start = p.start("use_start");
if !p.eat(USE_KW) {
use_start.abandon(p);
return None;
}
todo!()
if use_pat(p).is_none() {
p.start("expected_use_pat")
.error(p, SyntaxError::Expected(vec![USE_PAT]));
}
let use_item = use_start.complete(p, DEF);
Some(if p.eat(SEMICOLON) {
use_item
} else if TOP_LEVEL_ITEM_START.contains(p.current()) || p.at(EOF) {
use_item
.precede(p, "unterminated_tl_item")
.error(p, SyntaxError::UnterminatedTopLevelItem)
} else {
use_item
.precede(p, "err_unexpected")
.error(p, SyntaxError::Expected(vec![SEMICOLON]))
})
}
fn use_pat(p: &mut Parser) -> Option<CompletedMarker> {
let use_pat_marker = p.start("use_pat");
if !p.eat(IDENT) {
return None;
}
loop {
if p.eat(PATH_SEP) {
if pat_item(p).is_none() {
break Some(use_pat_marker.error(p, SyntaxError::UnfinishedPath));
}
} else if p.at(SEMICOLON) && p.nth_at(1, COLON) {
let broken_sep = p.start("broken_path_sep");
let wrong_semi = p.start("semi_typo");
p.eat(SEMICOLON);
wrong_semi.error(p, SyntaxError::PathSepContainsSemicolon);
p.eat(COLON);
broken_sep.complete(p, PATH_SEP);
} else if p.at(COLON) && p.nth_at(1, SEMICOLON) {
let broken_sep = p.start("broken_path_sep");
p.eat(COLON);
let wrong_semi = p.start("semi_typo");
p.eat(SEMICOLON);
wrong_semi.error(p, SyntaxError::PathSepContainsSemicolon);
broken_sep.complete(p, PATH_SEP);
} else if p.at(SEMICOLON) && p.nth_at(1, SEMICOLON) {
let broken_sep = p.start("broken_path_sep");
p.eat(SEMICOLON);
p.eat(SEMICOLON);
broken_sep
.complete(p, PATH_SEP)
.precede(p, "semi_typo_err")
.error(p, SyntaxError::PathSepContainsSemicolon);
} else if p.at(SEMICOLON) {
break Some(use_pat_marker.complete(p, USE_PAT));
} else {
break Some(use_pat_marker.error(p, SyntaxError::Expected(vec![PATH_SEP, SEMICOLON])));
}
}
}
fn pat_item(p: &mut Parser) -> Option<CompletedMarker> {
let item_start = p.start("pat_item_start");
if p.eat(IDENT) {
Some(item_start.complete(p, PAT_ITEM))
} else if p.eat(STAR) {
Some(item_start.complete(p, PAT_GLOB))
} else if p.eat(L_BRACE) {
todo!("write PAT_GROUPs")
} else {
None
}
}

View file

@ -27,14 +27,20 @@ pub enum SyntaxKind {
#[token("in")]
IN_KW,
LET_IN,
#[token("::")]
PATH_SEP,
#[token("mod")]
MOD_KW,
MODULE,
MODULE_NAME,
MODULE_BODY,
USE,
#[token("use")]
USE_KW,
USE_PAT,
PAT_ITEM,
PAT_GLOB,
PAT_GROUP,
#[regex("[\\d]+")]
INT_NUM,
#[regex("[+-]?([\\d]+\\.[\\d]*|[\\d]*\\.[\\d]+)")]

View file

@ -1,4 +1,6 @@
def hello_world = meow [ 1 2 ]
use hello::meow;
def hello_world = meow [ 1 2 ];
def test