From be60d5aa6669a74e92495288f44b7f9258a8518f Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Sat, 20 Jan 2018 21:49:58 +0300 Subject: Drop more high-order stuff --- src/parser/event_parser/grammar/attributes.rs | 33 +++++++++---- src/parser/event_parser/grammar/expressions.rs | 21 +++++---- src/parser/event_parser/grammar/items.rs | 65 ++++++++++++++------------ src/parser/event_parser/grammar/mod.rs | 15 ------ src/parser/event_parser/grammar/paths.rs | 59 ++++++++++++----------- 5 files changed, 100 insertions(+), 93 deletions(-) (limited to 'src/parser') diff --git a/src/parser/event_parser/grammar/attributes.rs b/src/parser/event_parser/grammar/attributes.rs index a896b4901..8b5e5bcfe 100644 --- a/src/parser/event_parser/grammar/attributes.rs +++ b/src/parser/event_parser/grammar/attributes.rs @@ -1,5 +1,6 @@ use super::*; +#[derive(PartialEq, Eq)] enum AttrKind { Inner, Outer } @@ -14,18 +15,27 @@ pub(super) fn outer_attributes(p: &mut Parser) { fn attribute(p: &mut Parser, kind: AttrKind) -> bool { - fn attr_tail(p: &mut Parser) { - meta_item(p) && p.expect(R_BRACK); - } - - match kind { - AttrKind::Inner => node_if(p, [POUND, EXCL, L_BRACK], ATTR, attr_tail), - AttrKind::Outer => node_if(p, [POUND, L_BRACK], ATTR, attr_tail), + if p.at(POUND) { + if kind == AttrKind::Inner && p.raw_lookahead(1) != EXCL { + return false; + } + p.start(ATTR); + p.bump(); + if kind == AttrKind::Inner { + p.bump(); + } + p.expect(L_BRACK) && meta_item(p) && p.expect(R_BRACK); + p.finish(); + true + } else { + false } } fn meta_item(p: &mut Parser) -> bool { - node_if(p, IDENT, META_ITEM, |p| { + if p.at(IDENT) { + p.start(META_ITEM); + p.bump(); if p.eat(EQ) { if !expressions::literal(p) { p.error() @@ -36,7 +46,12 @@ fn meta_item(p: &mut Parser) -> bool { comma_list(p, R_PAREN, meta_item_inner); p.expect(R_PAREN); } - }) + p.finish(); + true + } else { + false + } + } fn meta_item_inner(p: &mut Parser) -> bool { diff --git a/src/parser/event_parser/grammar/expressions.rs b/src/parser/event_parser/grammar/expressions.rs index f40a3cce2..0f65193c9 100644 --- a/src/parser/event_parser/grammar/expressions.rs +++ b/src/parser/event_parser/grammar/expressions.rs @@ -1,11 +1,16 @@ use super::*; pub(super) fn literal(p: &mut Parser) -> bool { - let literals = [ - TRUE_KW, FALSE_KW, - INT_NUMBER, FLOAT_NUMBER, - BYTE, CHAR, - STRING, RAW_STRING, BYTE_STRING, RAW_BYTE_STRING, - ]; - node_if(p, AnyOf(&literals), LITERAL, |_| ()) -} \ No newline at end of file + match p.current() { + TRUE_KW | FALSE_KW | + INT_NUMBER | FLOAT_NUMBER | + BYTE | CHAR | + STRING | RAW_STRING | BYTE_STRING | RAW_BYTE_STRING => { + p.start(LITERAL); + p.bump(); + p.finish(); + true + } + _ => false + } +} diff --git a/src/parser/event_parser/grammar/items.rs b/src/parser/event_parser/grammar/items.rs index f96f4cc9c..4514f0dab 100644 --- a/src/parser/event_parser/grammar/items.rs +++ b/src/parser/event_parser/grammar/items.rs @@ -7,7 +7,7 @@ pub(super) fn mod_contents(p: &mut Parser) { } } -fn item(p: &mut Parser){ +fn item(p: &mut Parser) { let attrs_start = p.mark(); attributes::outer_attributes(p); visibility(p); @@ -51,7 +51,7 @@ fn struct_item(p: &mut Parser) { fn struct_inner(p: &mut Parser) { if !p.expect(IDENT) { p.finish(); - return + return; } generic_parameters(p); match p.current() { @@ -60,31 +60,31 @@ fn struct_item(p: &mut Parser) { match p.current() { SEMI => { p.bump(); - return + return; } L_CURLY => named_fields(p), _ => { //TODO: special case `(` error message p.error() .message("expected `;` or `{`") .emit(); - return + return; } } } SEMI => { p.bump(); - return + return; } L_CURLY => named_fields(p), L_PAREN => { tuple_fields(p); p.expect(SEMI); - }, + } _ => { p.error() .message("expected `;`, `{`, or `(`") .emit(); - return + return; } } } @@ -108,7 +108,7 @@ fn named_fields(p: &mut Parser) { fn tuple_fields(p: &mut Parser) { if !p.expect(L_PAREN) { - return + return; } comma_list(p, R_PAREN, |p| { tuple_field(p); @@ -124,11 +124,9 @@ fn tuple_fields(p: &mut Parser) { } } -fn generic_parameters(_: &mut Parser) { -} +fn generic_parameters(_: &mut Parser) {} -fn where_clause(_: &mut Parser) { -} +fn where_clause(_: &mut Parser) {} fn extern_crate_item(p: &mut Parser) { p.start(EXTERN_CRATE_ITEM); @@ -168,24 +166,29 @@ fn use_item(p: &mut Parser) { p.expect(SEMI); p.finish(); - fn use_tree(p: &mut Parser) -> bool{ - if node_if(p, STAR, USE_TREE, |_| ()) { - return true - } - if node_if(p, [COLONCOLON, STAR], USE_TREE, |_| ()) { - return true - } - if [COLONCOLON, L_CURLY].is_ahead(p) || L_CURLY.is_ahead(p) { - node(p, USE_TREE, |p| { - p.eat(COLONCOLON); + fn use_tree(p: &mut Parser) -> bool { + let la = p.raw_lookahead(1); + match (p.current(), la) { + (STAR, _) => { + p.start(USE_TREE); + p.bump(); + } + (COLONCOLON, STAR) => { + p.start(USE_TREE); + p.bump(); + p.bump(); + } + (L_CURLY, _) | (COLONCOLON, L_CURLY) => { + p.start(USE_TREE); + if p.at(COLONCOLON) { + p.bump(); + } p.curly_block(|p| { comma_list(p, EOF, use_tree); }); - }); - return true; - } - if paths::is_path_start(p) { - node(p, USE_TREE, |p| { + } + _ if paths::is_path_start(p) => { + p.start(USE_TREE); paths::use_path(p); match p.current() { AS_KW => { @@ -212,15 +215,15 @@ fn use_item(p: &mut Parser) { } _ => (), } - }); - return true; + } + _ => return false, } - false + p.finish(); + return true; } } - fn fn_item(p: &mut Parser) { p.start(FN_ITEM); diff --git a/src/parser/event_parser/grammar/mod.rs b/src/parser/event_parser/grammar/mod.rs index 0c775bb25..c3d0c8c10 100644 --- a/src/parser/event_parser/grammar/mod.rs +++ b/src/parser/event_parser/grammar/mod.rs @@ -46,21 +46,6 @@ fn alias(p: &mut Parser) -> bool { true //FIXME: return false if three are errors } -fn node_if( - p: &mut Parser, - first: L, - node_kind: SyntaxKind, - rest: F -) -> bool { - first.is_ahead(p) && { node(p, node_kind, |p| { L::consume(p); rest(p); }); true } -} - -fn node(p: &mut Parser, node_kind: SyntaxKind, rest: F) { - p.start(node_kind); - rest(p); - p.finish(); -} - fn repeat bool>(p: &mut Parser, mut f: F) { loop { let pos = p.pos(); diff --git a/src/parser/event_parser/grammar/paths.rs b/src/parser/event_parser/grammar/paths.rs index 45f3cb779..f5124cfce 100644 --- a/src/parser/event_parser/grammar/paths.rs +++ b/src/parser/event_parser/grammar/paths.rs @@ -1,6 +1,6 @@ use super::*; -pub (crate) fn is_path_start(p: &Parser) -> bool { +pub(crate) fn is_path_start(p: &Parser) -> bool { AnyOf(&[IDENT, SELF_KW, SUPER_KW, COLONCOLON]).is_ahead(p) } @@ -9,39 +9,38 @@ pub(crate) fn use_path(p: &mut Parser) { return; } let mut prev = p.mark(); - node(p, PATH, |p| { - path_segment(p, true); - }); - repeat(p, |p| { + p.start(PATH); + path_segment(p, true); + p.finish(); + loop { let curr = p.mark(); - if p.current() == COLONCOLON && !items::is_use_tree_start(p.raw_lookahead(1)) { - node(p, PATH, |p| { - p.bump(); - path_segment(p, false); - p.forward_parent(prev, curr); - prev = curr; - }); - true + if p.at(COLONCOLON) && !items::is_use_tree_start(p.raw_lookahead(1)) { + p.start(PATH); + p.bump(); + path_segment(p, false); + p.forward_parent(prev, curr); + prev = curr; + p.finish(); } else { - false + break; } - }); + } } fn path_segment(p: &mut Parser, first: bool) { - node(p, PATH_SEGMENT, |p| { - if first { - p.eat(COLONCOLON); + p.start(PATH_SEGMENT); + if first { + p.eat(COLONCOLON); + } + match p.current() { + IDENT | SELF_KW | SUPER_KW => { + p.bump(); } - match p.current() { - IDENT | SELF_KW | SUPER_KW => { - p.bump(); - }, - _ => { - p.error() - .message("expected identifier") - .emit(); - } - }; - }) -} \ No newline at end of file + _ => { + p.error() + .message("expected identifier") + .emit(); + } + }; + p.finish(); +} -- cgit v1.2.3