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parser: Refactor Parsable to align with assembler::Assemble

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This commit is contained in:
John 2024-01-31 17:59:31 -06:00
parent af89541af1
commit 860c9d4a97
1 changed files with 29 additions and 23 deletions
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52
src/parser.rs
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@ -37,7 +37,7 @@ impl<'t> Parser<'t> {
}
pub fn parse<T: Parsable<'t>>(&mut self) -> PResult<T> {
Parsable::parse(self)
Parsable::parse_with(self)
}
pub fn error(&self, kind: ErrorKind, parsing: Parsing) -> Error {
Error { parsing, kind, loc: self.loc }
@ -194,11 +194,14 @@ impl<'t> Parser<'t> {
}
pub trait Parsable<'t>: Sized {
fn parse(p: &mut Parser<'t>) -> PResult<Self>;
fn parse(text: &'t str) -> PResult<Self> {
Self::parse_with(&mut Parser::new(text))
}
fn parse_with(p: &mut Parser<'t>) -> PResult<Self>;
}
impl<'t> Parsable<'t> for Statements<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let mut stmts = vec![];
while p.peek(Parsing::File)?.kind != Kind::Eof {
stmts.push(p.parse()?)
@ -208,7 +211,7 @@ impl<'t> Parsable<'t> for Statements<'t> {
}
impl<'t> Parsable<'t> for Statement<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let token = *p.peek(Parsing::Stmt)?;
Ok(match token.kind {
Kind::Comment => {
@ -222,7 +225,7 @@ impl<'t> Parsable<'t> for Statement<'t> {
}
}
impl<'t> Parsable<'t> for Directive<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::Directive;
let Token { lexeme, kind, pos: _ } = *p.peek(parsing)?;
let Kind::Directive = kind else { return Err(p.error(Unexpected(kind), parsing)) };
@ -238,7 +241,7 @@ impl<'t> Parsable<'t> for Directive<'t> {
}
}
impl<'t> Parsable<'t> for Vec<Token<'t>> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::Directive;
let mut tokens = vec![];
loop {
@ -252,13 +255,13 @@ impl<'t> Parsable<'t> for Vec<Token<'t>> {
}
}
impl<'t> Parsable<'t> for Instruction<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let start = p.peek(Parsing::Instruction)?.pos.start;
Ok(Self { kind: p.parse()?, span: Span { start, end: p.loc.end } })
}
}
impl<'t> Parsable<'t> for InstructionKind<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
use crate::lexer::token::OneArg;
// an instruction starts with an opcode
Ok(match p.peek(Parsing::Instruction)?.kind() {
@ -274,7 +277,7 @@ impl<'t> Parsable<'t> for InstructionKind<'t> {
}
}
impl<'t> Parsable<'t> for NoEm {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
match p.next(Parsing::NoEm)?.kind {
Kind::NoEm(opcode) => Ok(Self { opcode }),
ty => Err(p.error(Unexpected(ty), Parsing::NoEm)),
@ -282,7 +285,7 @@ impl<'t> Parsable<'t> for NoEm {
}
}
impl<'t> Parsable<'t> for OneEm<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
Ok(Self {
opcode: match p.next(Parsing::OneEm)?.kind {
Kind::OneEm(opcode) => opcode,
@ -294,7 +297,7 @@ impl<'t> Parsable<'t> for OneEm<'t> {
}
}
impl<'t> Parsable<'t> for OneArg<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
Ok(Self {
opcode: match p.next(Parsing::OneArg)?.kind {
Kind::OneArg(opcode) => opcode,
@ -306,7 +309,7 @@ impl<'t> Parsable<'t> for OneArg<'t> {
}
}
impl<'t> Parsable<'t> for TwoArg<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::TwoArg;
Ok(Self {
opcode: match p.next(parsing)?.kind {
@ -320,7 +323,7 @@ impl<'t> Parsable<'t> for TwoArg<'t> {
}
}
impl<'t> Parsable<'t> for Jump<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::Jump;
Ok(Self {
opcode: match p.next(parsing)?.kind {
@ -332,21 +335,21 @@ impl<'t> Parsable<'t> for Jump<'t> {
}
}
impl<'t> Parsable<'t> for Reti {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
use crate::lexer::token::OneArg;
p.assert(Kind::OneArg(OneArg::Reti), Parsing::Reti)?;
Ok(Reti)
}
}
impl<'t> Parsable<'t> for Br<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
p.assert(Kind::Special(Special::Br), Parsing::Br)?;
Ok(Self { src: p.parse()? })
}
}
impl<'t> Parsable<'t> for Src<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::Src;
Ok(match p.peek(parsing)?.kind {
Kind::Hash => Src::Immediate(p.then(parsing)?.parse()?), // #imm, #special
@ -379,7 +382,7 @@ impl<'t> Parsable<'t> for Src<'t> {
}
}
impl<'t> Parsable<'t> for Dst<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::Dst;
Ok(match p.peek(parsing)?.kind {
Kind::Hash => match p.then(parsing)?.next(parsing)?.kind {
@ -399,7 +402,7 @@ impl<'t> Parsable<'t> for Dst<'t> {
}
}
impl<'t> Parsable<'t> for JumpDst<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::Jump;
let mut neg = false;
let out = loop {
@ -420,7 +423,7 @@ impl<'t> Parsable<'t> for JumpDst<'t> {
}
}
impl<'t> Parsable<'t> for Width {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let out = match p.peek(Parsing::Width)?.kind() {
Kind::Byte => Width::Byte,
Kind::Word => Width::Word,
@ -431,7 +434,7 @@ impl<'t> Parsable<'t> for Width {
}
}
impl<'t> Parsable<'t> for Reg {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let out = match p.peek(Parsing::Reg)?.kind {
Kind::Reg(r) => r,
ty => Err(p.error(Unexpected(ty), Parsing::Reg))?,
@ -441,17 +444,17 @@ impl<'t> Parsable<'t> for Reg {
}
}
impl<'t> Parsable<'t> for Expr<'t> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
p.expr()
}
}
impl<'t, T: Parsable<'t>> Parsable<'t> for Box<T> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
Ok(Box::new(p.parse()?))
}
}
impl<'t, T: Parsable<'t>> Parsable<'t> for Vec<T> {
fn parse(p: &mut Parser<'t>) -> PResult<Self> {
fn parse_with(p: &mut Parser<'t>) -> PResult<Self> {
let parsing = Parsing::Vec;
p.assert(Kind::OpenBrace, parsing)?;
let mut out = vec![];
@ -589,3 +592,6 @@ pub mod error {
}
impl std::error::Error for Error {}
}
#[cfg(test)]
mod tests;