G: struct fields

grammar.ron

@@ -62,6 +62,7 @@ Grammar(
     ],
     nodes: [
         "FILE",
-        "STRUCT_ITEM"
+        "STRUCT_ITEM",
+        "STRUCT_FIELD",
     ]
 )

src/bin/gen.rs

@@ -6,7 +6,6 @@ extern crate ron;
 extern crate file;
 
 use std::path::PathBuf;
-use std::ascii::AsciiExt;
 use std::fmt::Write;
 
 fn main() {

src/parser/event_parser/grammar.rs

@@ -1,4 +1,3 @@
-use super::Event;
 use super::parser::Parser;
 
 use syntax_kinds::*;
@@ -52,8 +51,24 @@ fn item(p: &mut Parser) -> Result {
 
 fn struct_item(p: &mut Parser) -> Result {
     p.expect(IDENT)?;
-    p.expect(L_CURLY)?;
-    p.expect(R_CURLY)
+    p.curly_block(|p| {
+        comma_list(p, struct_field)
+    })
+}
+
+fn struct_field(p: &mut Parser) -> Result {
+    if !p.current_is(IDENT) {
+        return ERR;
+    }
+    p.start(STRUCT_FIELD);
+    p.bump();
+    ignore_errors(|| {
+        p.expect(COLON)?;
+        p.expect(IDENT)?;
+        OK
+    });
+    p.finish();
+    OK
 }
 
 // Paths, types, attributes, and stuff //
@@ -79,3 +94,18 @@ fn skip_one_token(p: &mut Parser) {
     p.bump().unwrap();
     p.finish();
 }
+
+fn ignore_errors<F: FnOnce() -> Result>(f: F) {
+    drop(f());
+}
+
+fn comma_list<F: Fn(&mut Parser) -> Result>(p: &mut Parser, element: F) {
+    loop {
+        if element(p).is_err() {
+            return
+        }
+        if p.expect(COMMA).is_err() {
+            return
+        }
+    }
+}

src/parser/event_parser/mod.rs

@@ -1,6 +1,5 @@
-use {Token, TextUnit, SyntaxKind};
+use {Token, SyntaxKind};
 
-use syntax_kinds::*;
 mod grammar;
 mod parser;
 

src/parser/event_parser/parser.rs

@@ -1,7 +1,7 @@
 use {Token, SyntaxKind, TextUnit};
 use super::{Event};
 use super::super::is_insignificant;
-use syntax_kinds::{WHITESPACE, COMMENT};
+use syntax_kinds::{L_CURLY, R_CURLY, ERROR};
 
 pub struct Parser<'t> {
     text: &'t str,
@@ -10,6 +10,7 @@ pub struct Parser<'t> {
 
     pos: usize,
     events: Vec<Event>,
+    curly_level: i32,
 }
 
 impl<'t> Parser<'t> {
@@ -30,6 +31,7 @@ impl<'t> Parser<'t> {
 
             pos: 0,
             events: Vec::new(),
+            curly_level: 0,
         }
     }
 
@@ -64,6 +66,11 @@ impl<'t> Parser<'t> {
 
     pub(crate) fn bump(&mut self) -> Option<SyntaxKind> {
         let kind = self.current()?;
+        match kind {
+            L_CURLY => self.curly_level += 1,
+            R_CURLY => self.curly_level -= 1,
+            _ => (),
+        }
         self.pos += 1;
         self.event(Event::Token { kind, n_raw_tokens: 1 });
         Some(kind)
@@ -78,6 +85,24 @@ impl<'t> Parser<'t> {
         }
     }
 
+    pub(crate) fn curly_block<F: FnOnce(&mut Parser)>(&mut self, f: F) -> Result<(), ()> {
+        let level = self.curly_level;
+        self.expect(L_CURLY)?;
+        f(self);
+        assert!(self.curly_level > level);
+        if self.expect(R_CURLY).is_ok() {
+            return Ok(());
+        }
+        self.start(ERROR);
+        while self.curly_level > level {
+            if self.bump().is_none() {
+                break;
+            }
+        }
+        self.finish();
+        Ok(()) //???
+    }
+
     fn event(&mut self, event: Event) {
         self.events.push(event)
     }

src/syntax_kinds.rs

@@ -60,8 +60,9 @@ pub const DOC_COMMENT: SyntaxKind = SyntaxKind(55);
 pub const SHEBANG: SyntaxKind = SyntaxKind(56);
 pub const FILE: SyntaxKind = SyntaxKind(57);
 pub const STRUCT_ITEM: SyntaxKind = SyntaxKind(58);
+pub const STRUCT_FIELD: SyntaxKind = SyntaxKind(59);
 
-static INFOS: [SyntaxInfo; 59] = [
+static INFOS: [SyntaxInfo; 60] = [
     SyntaxInfo { name: "USE_KW" },
     SyntaxInfo { name: "FN_KW" },
     SyntaxInfo { name: "STRUCT_KW" },
@@ -121,6 +122,7 @@ static INFOS: [SyntaxInfo; 59] = [
     SyntaxInfo { name: "SHEBANG" },
     SyntaxInfo { name: "FILE" },
     SyntaxInfo { name: "STRUCT_ITEM" },
+    SyntaxInfo { name: "STRUCT_FIELD" },
 ];
 
 pub(crate) fn syntax_info(kind: SyntaxKind) -> &'static SyntaxInfo {

tests/data/parser/0002_struct_item_field.rs

@@ -0,0 +1,3 @@
+struct S {
+    foo: u32
+}

tests/data/parser/0002_struct_item_field.txt

@@ -0,0 +1,15 @@
+FILE@[0; 25)
+  STRUCT_ITEM@[0; 25)
+    STRUCT_KW@[0; 6)
+    WHITESPACE@[6; 7)
+    IDENT@[7; 8)
+    WHITESPACE@[8; 9)
+    L_CURLY@[9; 10)
+    STRUCT_FIELD@[10; 24)
+      WHITESPACE@[10; 15)
+      IDENT@[15; 18)
+      COLON@[18; 19)
+      WHITESPACE@[19; 20)
+      IDENT@[20; 23)
+      WHITESPACE@[23; 24)
+    R_CURLY@[24; 25)

tests/parser.rs

@@ -61,7 +61,8 @@ fn dump_tree(file: &File) -> String {
 
     fn go(node: Node, buff: &mut String, level: usize) {
         buff.push_str(&String::from("  ").repeat(level));
-        write!(buff, "{:?}\n", node);
+        write!(buff, "{:?}\n", node)
+            .unwrap();
         for child in node.children() {
             go(child, buff, level + 1)
         }