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Merge pull request #15 from erindesu/master

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Fixed some incompatible old code
This commit is contained in:
Able 2021-05-03 18:41:23 -05:00 committed by GitHub
parent e8a2b87c6e 72cd540728
commit 143ae613d8
4 changed files with 119 additions and 70 deletions
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3
src/lexer.rs
View file

@ -88,9 +88,6 @@ pub enum Token {
#[token("if")]
If,
#[token("else")]
Else,
#[token("loop")]
Loop,

9
src/parser/item.rs
View file

@ -53,7 +53,7 @@ impl From<Iden> for Expr {
pub enum Stmt {
VariableDeclaration {
iden: Iden,
init: Option<Box<Item>>,
init: Option<Expr>,
},
FunctionDeclaration {
iden: Iden,
@ -65,7 +65,7 @@ pub enum Stmt {
body: String,
},
If {
cond: Box<Item>,
cond: Expr,
body: Vec<Item>,
},
FunctionCall {
@ -75,6 +75,11 @@ pub enum Stmt {
Loop {
body: Vec<Item>,
},
VarAssignment {
iden: Iden,
value: Expr,
},
Break,
HopBack,
Print(Expr),

63
src/parser/mod.rs
View file

@ -69,6 +69,7 @@ impl<'a> Parser<'a> {
| Token::String(_)
| Token::Nul
| Token::LeftParenthesis
| Token::Assignment
| Token::LogNot => self.parse_ops(token),
// Control flow
@ -98,7 +99,7 @@ impl<'a> Parser<'a> {
}
_ => Err(Error {
kind: ErrorKind::SyntaxError("Unexpected identifier".to_owned()),
kind: ErrorKind::SyntaxError("Unexpected token".to_owned()),
position: start..self.lexer.span().end,
}),
}
@ -110,13 +111,31 @@ impl<'a> Parser<'a> {
fn variable_declaration(&mut self) -> ParseResult {
let iden = self.require_iden()?;
let init = match self.lexer.next() {
Some(Token::Semicolon) => None,
let peek = self.lexer.peek().clone();
let init = match peek {
Some(Token::Semicolon) => {
self.lexer.next();
None
}
Some(Token::Assignment) => {
let value = self.lexer.next();
let value = self.parse_item(value)?;
self.require(Token::Semicolon)?;
Some(Box::new(value))
self.lexer.next();
let next = self.lexer.next();
let mut value = self.parse_expr(next)?;
loop {
let peek = self.lexer.peek().clone();
value = match peek {
Some(Token::Semicolon) => break,
None => {
return Err(Error {
kind: ErrorKind::EndOfTokenStream,
position: self.lexer.span(),
})
}
Some(t) => self.parse_operation(Some(t), value)?,
};
}
self.lexer.next();
Some(value)
}
_ => {
return Err(Error {
@ -134,6 +153,7 @@ impl<'a> Parser<'a> {
/// `functio [iden] ([expr], [expr]) { ... }
fn function_declaration(&mut self) -> ParseResult {
let iden = self.require_iden()?;
self.require(Token::LeftParenthesis)?;
let mut args = vec![];
loop {
@ -144,7 +164,9 @@ impl<'a> Parser<'a> {
_ => return Err(self.unexpected_token(None)),
}
}
self.require(Token::LeftBrace)?;
// Parse function body
let body = self.parse_body()?;
@ -191,19 +213,12 @@ impl<'a> Parser<'a> {
/// Parse If-stmt
pub fn if_cond(&mut self) -> ParseResult {
self.require(Token::LeftParenthesis)?;
let cond = self.lexer.next();
let cond = self.parse_item(cond)?;
self.require(Token::RightParenthesis)?;
let cond = self.parse_paren()?;
self.require(Token::LeftBrace)?;
let body = self.parse_body()?;
Ok(Stmt::If {
cond: Box::new(cond),
body,
}
.into())
Ok(Stmt::If { cond, body }.into())
}
/// Parse loop
@ -256,23 +271,17 @@ mod tests {
body: vec![
VariableDeclaration {
iden: Iden("a".to_owned()),
init: Some(Box::new(
Add {
init: Some(Add {
left: Box::new(Literal(Value::Int(3))),
right: Box::new(Literal(Value::Int(2))),
}
.into(),
)),
}),
}
.into(),
If {
cond: Box::new(
Eq {
cond: Eq {
left: Box::new(Iden("a".to_owned()).into()),
right: Box::new(Literal(Value::Int(5)).into()),
}
.into(),
),
},
body: vec![Break.into()],
}
.into(),
@ -289,7 +298,7 @@ mod tests {
let expected: &[Item] = &[
VariableDeclaration {
iden: Iden("script".to_owned()),
init: Some(Box::new(Literal(Value::Nul).into())),
init: Some(Literal(Value::Nul)),
}
.into(),
Print(Iden("script".to_owned()).into()).into(),

106
src/parser/ops.rs
View file

@ -20,34 +20,87 @@ macro_rules! gen_infix {
impl<'a> Parser<'a> {
pub(super) fn parse_ops(&mut self, token: Token) -> ParseResult {
if matches!(self.lexer.peek(), Some(Token::LeftParenthesis)) {
return self.fn_call(token);
// Statements
match self.lexer.peek() {
Some(Token::LeftParenthesis) => return self.fn_call(token),
Some(Token::Assignment) => return self.parse_assignment(token),
_ => (),
}
let mut buf: Expr = self.parse_expr(Some(token))?;
loop {
buf = match self.lexer.peek() {
Some(Token::Addition) => self.addition(buf)?,
Some(Token::Subtract) => self.subtract(buf)?,
Some(Token::Multiply) => self.multiply(buf)?,
Some(Token::Divide) => self.divide(buf)?,
Some(Token::OpLt) => self.cmplt(buf)?,
Some(Token::OpGt) => self.cmpgt(buf)?,
Some(Token::OpEq) => self.cmpeq(buf)?,
Some(Token::OpNeq) => self.cmpneq(buf)?,
Some(Token::LogAnd) => self.logand(buf)?,
Some(Token::LogOr) => self.logor(buf)?,
let peek = self.lexer.peek().clone();
buf = match peek {
// Print statement
Some(Token::Print) => {
self.lexer.next();
self.require(Token::Semicolon)?;
return Ok(Stmt::Print(buf).into());
}
_ => return Ok(buf.into()),
None => return Ok(buf.into()),
// An expression
_ => self.parse_operation(peek, buf)?,
}
}
}
/// Match and perform
pub(super) fn parse_operation(&mut self, token: Option<Token>, buf: Expr) -> ExprResult {
match token {
Some(Token::Addition) => self.addition(buf),
Some(Token::Subtract) => self.subtract(buf),
Some(Token::Multiply) => self.multiply(buf),
Some(Token::Divide) => self.divide(buf),
Some(Token::OpLt) => self.cmplt(buf),
Some(Token::OpGt) => self.cmpgt(buf),
Some(Token::OpEq) => self.cmpeq(buf),
Some(Token::OpNeq) => self.cmpneq(buf),
Some(Token::LogAnd) => self.logand(buf),
Some(Token::LogOr) => self.logor(buf),
Some(Token::LeftParenthesis) => Err(Error {
kind: ErrorKind::SyntaxError("Function call isn't an expression!".to_owned()),
position: self.lexer.span(),
}),
Some(_) | None => Err(self.unexpected_token(None)),
}
}
fn parse_assignment(&mut self, token: Token) -> ParseResult {
self.lexer.next();
// Extract identifier
let iden = if let Token::Identifier(i) = token {
Iden(i)
} else {
return Err(Error {
kind: ErrorKind::InvalidIdentifier,
position: self.lexer.span(),
});
};
let next = self.lexer.next();
let mut value = self.parse_expr(next)?;
loop {
let peek = self.lexer.peek().clone();
value = match peek {
Some(Token::Semicolon) => break,
None => {
return Err(Error {
kind: ErrorKind::EndOfTokenStream,
position: self.lexer.span(),
})
}
Some(t) => self.parse_operation(Some(t), value)?,
};
}
self.lexer.next();
Ok(Stmt::VarAssignment { iden, value }.into())
}
// Generate infix
gen_infix! {
addition => Add;
@ -94,33 +147,18 @@ impl<'a> Parser<'a> {
}
/// Parse parenthesieted expression
fn parse_paren(&mut self) -> ExprResult {
pub(super) fn parse_paren(&mut self) -> ExprResult {
let next = self.lexer.next();
let mut buf = self.parse_expr(next)?;
loop {
let next = self.lexer.peek().clone().ok_or(Error {
kind: ErrorKind::EndOfTokenStream,
position: self.lexer.span(),
})?;
buf = match Some(next) {
Some(Token::Addition) => self.addition(buf)?,
Some(Token::Subtract) => self.subtract(buf)?,
Some(Token::Multiply) => self.multiply(buf)?,
Some(Token::Divide) => self.divide(buf)?,
Some(Token::LeftParenthesis) => {
return Err(Error {
kind: ErrorKind::SyntaxError(
"Function call isn't an expression!".to_owned(),
),
position: self.lexer.span(),
})
}
let peek = self.lexer.peek().clone();
buf = match peek {
Some(Token::RightParenthesis) => {
self.lexer.next();
return Ok(buf);
}
_ => return Ok(buf),
None => return Ok(buf),
Some(t) => self.parse_operation(Some(t), buf)?,
};
}
}