lmao what

parser/src/ast.rs

@@ -0,0 +1,25 @@
+use dbg_pls::DebugPls;
+
+use crate::Span;
+
+pub type Spanned<T> = (T, Span);
+
+#[derive(Debug, DebugPls)]
+pub enum TypeSpecifier {
+    Void,
+    Char,
+    Short,
+    Int,
+    Long,
+    Float,
+    Double,
+    Signed,
+    Unsigned,
+    Bool,
+    Complex,
+    // TODO
+    // atomic-type-specifier
+    // struct-or-union-specifier
+    // enum-specifier
+    // typedef-name
+}

parser/src/lib.rs

@@ -1,6 +1,8 @@
 #![allow(dead_code)]
 #![warn(rust_2018_idioms)]
 
+mod ast;
+mod parser;
 mod pre;
 mod token;
 

parser/src/parser.rs

@@ -0,0 +1,59 @@
+use peekmore::PeekMoreIterator;
+
+use crate::{
+    ast::{Spanned, TypeSpecifier},
+    token::{Keyword as Kw, Token as Tok},
+    Span,
+};
+
+struct ParserError {
+    span: Span,
+    message: String,
+}
+
+impl ParserError {
+    fn new(span: Span, message: String) -> Self {
+        Self { span, message }
+    }
+
+    fn eof() -> Self {
+        Self::new(0..0, "unexpected end of file".to_string())
+    }
+}
+
+type Result<T, E = ParserError> = std::result::Result<T, E>;
+
+struct Parser<'src, I>
+where
+    I: Iterator<Item = (Tok<'src>, Span)>,
+{
+    lex: PeekMoreIterator<I>,
+}
+
+impl<'src, I> Parser<'src, I>
+where
+    I: Iterator<Item = (Tok<'src>, Span)>,
+{
+    fn type_specifier(&mut self) -> Result<Spanned<TypeSpecifier>> {
+        let (token, span) = self.next_t()?;
+        let ty = match token {
+            Tok::Kw(Kw::Void) => TypeSpecifier::Void,
+            Tok::Kw(Kw::Char) => TypeSpecifier::Char,
+            Tok::Kw(Kw::Short) => TypeSpecifier::Short,
+            Tok::Kw(Kw::Int) => TypeSpecifier::Int,
+            Tok::Kw(Kw::Long) => TypeSpecifier::Long,
+            Tok::Kw(Kw::Float) => TypeSpecifier::Float,
+            Tok::Kw(Kw::Double) => TypeSpecifier::Double,
+            Tok::Kw(Kw::Signed) => TypeSpecifier::Signed,
+            Tok::Kw(Kw::Unsigned) => TypeSpecifier::Unsigned,
+            Tok::Kw(Kw::Bool) => TypeSpecifier::Bool,
+            Tok::Kw(Kw::Complex) => return Err(ParserError::new(span, "tf are you doing with complex numbers".to_string())),
+            tok => return Err(ParserError::new(span, format!("Invalid token: `{tok}`"))),
+        };
+        Ok((ty, span))
+    }
+
+    fn next_t(&mut self) -> Result<(Tok<'src>, Span)> {
+        self.lex.next().ok_or_else(ParserError::eof)
+    }
+}

parser/src/pre/lexer.rs

@@ -3,7 +3,7 @@
 //!
 //! Code might be bad. Possibly.
 
-use std::ops::Not;
+use std::{ops::Not, fmt::Display};
 
 use peekmore::PeekMore;
 
@@ -119,6 +119,60 @@ pub enum Punctuator {
     HashHash,
 }
 
+impl Display for Punctuator {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Punctuator::BracketOpen => f.write_str("["),
+            Punctuator::BracketClose => f.write_str("]"),
+            Punctuator::ParenOpen => f.write_str("("),
+            Punctuator::ParenClose => f.write_str(")"),
+            Punctuator::BraceOpen => f.write_str("{"),
+            Punctuator::BraceClose => f.write_str("}"),
+            Punctuator::Dot => f.write_str("."),
+            Punctuator::Arrow => f.write_str("->"),
+            Punctuator::PlusPlus => f.write_str("++"),
+            Punctuator::MinusMinus => f.write_str("--"),
+            Punctuator::Ampersand => f.write_str("&"),
+            Punctuator::Asterisk => f.write_str("*"),
+            Punctuator::Plus => f.write_str("+"),
+            Punctuator::Minus => f.write_str("-"),
+            Punctuator::Tilde => f.write_str("~"),
+            Punctuator::Bang => f.write_str("!"),
+            Punctuator::Percent => f.write_str("%"),
+            Punctuator::LeftLeftChevron => f.write_str("<<"),
+            Punctuator::RightRightChevron => f.write_str(">>"),
+            Punctuator::LeftChevron => f.write_str("<"),
+            Punctuator::RightChevron => f.write_str(">"),
+            Punctuator::LeftChevronEq => f.write_str("<="),
+            Punctuator::RightChevronEq => f.write_str(">="),
+            Punctuator::EqEq => f.write_str("=="),
+            Punctuator::BangEq => f.write_str("!="),
+            Punctuator::Caret => f.write_str("^"),
+            Punctuator::Pipe => f.write_str("|"),
+            Punctuator::AmpersandAmpersand => f.write_str("&&"),
+            Punctuator::PipePipe => f.write_str("||"),
+            Punctuator::QuestionMark => f.write_str("?"),
+            Punctuator::Colon => f.write_str(":"),
+            Punctuator::Semicolon => f.write_str(";"),
+            Punctuator::DotDotDot => f.write_str("..."),
+            Punctuator::Eq => f.write_str("="),
+            Punctuator::AsteriskEq => f.write_str("*="),
+            Punctuator::SlashEq => f.write_str("/="),
+            Punctuator::PercentEq => f.write_str("%="),
+            Punctuator::PlusEq => f.write_str("+="),
+            Punctuator::MinusEq => f.write_str("-="),
+            Punctuator::LeftLeftChevronEq => f.write_str("<<="),
+            Punctuator::RightRightChevronEq => f.write_str(">>="),
+            Punctuator::AmspersandEq => f.write_str("&="),
+            Punctuator::CaretEq => f.write_str("^="),
+            Punctuator::PipeEq => f.write_str("|="),
+            Punctuator::Comma => f.write_str(","),
+            Punctuator::Hash => f.write_str("#"),
+            Punctuator::HashHash => f.write_str("##"),
+        }
+    }
+}
+
 struct PLexer<'src, I>
 where
     I: Iterator<Item = (usize, u8)>,

parser/src/token.rs

@@ -1,3 +1,5 @@
+use std::fmt::Display;
+
 use crate::{
     pre::{PToken, Punctuator},
     Span,
@@ -11,7 +13,7 @@ use crate::{
 ///   punctuator
 #[derive(Debug)]
 pub enum Token<'src> {
-    Keyword(Keyword),
+    Kw(Keyword),
     Identifier(&'src str),
     Constant(Constant),
     StringLiteral(&'src str),
@@ -137,7 +139,7 @@ pub fn pre_tokens_to_tokens<'src>(
         let token = match token {
             PToken::HeaderName(_) => todo!("header names aren't real, wake up"),
             PToken::Identifier(ident) => match ident_to_keyword(ident) {
-                Some(keyword) => Token::Keyword(keyword),
+                Some(keyword) => Token::Kw(keyword),
                 None => Token::Identifier(ident),
             },
             PToken::PpNumber(number) => pp_number_to_constant(number)
@@ -153,6 +155,80 @@ pub fn pre_tokens_to_tokens<'src>(
     })
 }
 
+impl Display for Token<'_> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Token::Kw(kw) => Display::fmt(kw, f),
+            Token::Identifier(ident) => Display::fmt(ident, f),
+            Token::Constant(c) => Display::fmt(c, f),
+            Token::StringLiteral(str) => write!(f, "\"{}\"", str),
+            Token::Punctuator(p) => Display::fmt(p, f),
+            Token::Error => f.write_str("<invalid token>"),
+        }
+    }
+}
+
+impl Display for Keyword {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Keyword::Auto => f.write_str("auto"),
+            Keyword::Break => f.write_str("break"),
+            Keyword::Case => f.write_str("case"),
+            Keyword::Char => f.write_str("char"),
+            Keyword::Const => f.write_str("const"),
+            Keyword::Continue => f.write_str("continue"),
+            Keyword::Default => f.write_str("default"),
+            Keyword::Do => f.write_str("do"),
+            Keyword::Double => f.write_str("double"),
+            Keyword::Else => f.write_str("else"),
+            Keyword::Enum => f.write_str("enum"),
+            Keyword::Extern => f.write_str("extern"),
+            Keyword::Float => f.write_str("float"),
+            Keyword::For => f.write_str("for"),
+            Keyword::Goto => f.write_str("goto"),
+            Keyword::If => f.write_str("if"),
+            Keyword::Inline => f.write_str("inline"),
+            Keyword::Int => f.write_str("int"),
+            Keyword::Long => f.write_str("long"),
+            Keyword::Register => f.write_str("register"),
+            Keyword::Restrict => f.write_str("restrict"),
+            Keyword::Return => f.write_str("return"),
+            Keyword::Short => f.write_str("short"),
+            Keyword::Signed => f.write_str("signed"),
+            Keyword::Sizeof => f.write_str("sizeof"),
+            Keyword::Static => f.write_str("static"),
+            Keyword::Struct => f.write_str("struct"),
+            Keyword::Switch => f.write_str("switch"),
+            Keyword::Typedef => f.write_str("typedef"),
+            Keyword::Union => f.write_str("union"),
+            Keyword::Unsigned => f.write_str("unsigned"),
+            Keyword::Void => f.write_str("void"),
+            Keyword::Volatile => f.write_str("volatile"),
+            Keyword::While => f.write_str("while"),
+            Keyword::Alignas => f.write_str("_Alignas"),
+            Keyword::Alignof => f.write_str("_Alignof"),
+            Keyword::Atomic => f.write_str("_Atomic"),
+            Keyword::Bool => f.write_str("_Bool"),
+            Keyword::Complex => f.write_str("_Complex"),
+            Keyword::Generic => f.write_str("_Generic"),
+            Keyword::Imaginary => f.write_str("_Imaginary"),
+            Keyword::Noreturn => f.write_str("_Noreturn"),
+            Keyword::StaticAssert => f.write_str("_Static_assert"),
+            Keyword::ThreadLocal => f.write_str("_Thread_local"),
+        }
+    }
+}
+
+impl Display for Constant {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Constant::Int(int) => Display::fmt(int, f),
+            Constant::Float(float) => Display::fmt(float, f),
+            Constant::Char(c) => write!(f, "'{}'", *c as char),
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     macro_rules! lex_test {
@@ -173,4 +249,4 @@ int main() {
 "#;
         lex_test!(src);
     }
-}
+}