AbleScript
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ablescript
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Generalised Spanned items

pull/7/head
ondra05 2022-04-02 01:22:46 +02:00
parent 6cfd26dcc2
commit 75df416679
4 changed files with 102 additions and 105 deletions
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126
ablescript/src/ast.rs
View File

@ -8,12 +8,48 @@
//! just plain subroutines and they do not return any value,
//! so their calls are statements.
use std::hash::Hash;
use std::{fmt::Debug, hash::Hash};
use crate::variables::Value;
type Span = std::ops::Range<usize>;
#[derive(Clone)]
pub struct Spanned<T> {
pub item: T,
pub span: Span,
}
impl<T> Spanned<T> {
pub fn new(item: T, span: Span) -> Self {
Self { item, span }
}
}
impl<T: Debug> Debug for Spanned<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if f.alternate() {
write!(f, "{:#?}", self.item)
} else {
write!(f, "{:?}", self.item)
}?;
write!(f, " @ {:?}", self.span)
}
}
impl<T: PartialEq> PartialEq for Spanned<T> {
fn eq(&self, other: &Self) -> bool {
self.item == other.item
}
}
impl<T: Hash> Hash for Spanned<T> {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.item.hash(state);
}
}
#[derive(Debug, Clone)]
pub struct Ident {
pub ident: String,
@ -47,14 +83,14 @@ pub struct Assignable {
#[derive(Debug, PartialEq, Clone, Hash)]
pub enum AssignableKind {
Variable,
Index { indices: Vec<Expr> },
Index { indices: Vec<Spanned<ExprKind>> },
}
pub struct InvalidAssignable;
impl Assignable {
pub fn from_expr(expr: Expr) -> Result<Assignable, InvalidAssignable> {
match expr.kind {
pub fn from_expr(expr: Spanned<ExprKind>) -> Result<Assignable, InvalidAssignable> {
match expr.item {
ExprKind::Variable(ident) => Ok(Assignable {
ident: Ident::new(ident, expr.span),
kind: AssignableKind::Variable,
@ -64,10 +100,10 @@ impl Assignable {
}
}
fn from_index(mut buf: Expr, index: Expr) -> Result<Assignable, InvalidAssignable> {
fn from_index(mut buf: Spanned<ExprKind>, index: Spanned<ExprKind>) -> Result<Assignable, InvalidAssignable> {
let mut indices = vec![index];
let ident = loop {
match buf.kind {
match buf.item {
ExprKind::Variable(ident) => break ident,
ExprKind::Index { expr, index } => {
indices.push(*index);
@ -87,33 +123,15 @@ impl Assignable {
#[derive(Debug, PartialEq, Clone, Hash)]
pub struct Block {
pub block: Vec<Stmt>,
pub block: Vec<Spanned<StmtKind>>,
}
/// A syntactic unit expressing an effect.
#[derive(Debug, Clone)]
pub struct Stmt {
pub kind: StmtKind,
pub span: Span,
}
impl PartialEq for Stmt {
fn eq(&self, other: &Self) -> bool {
self.kind == other.kind
}
}
impl Hash for Stmt {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.kind.hash(state)
}
}
#[derive(Debug, PartialEq, Clone, Hash)]
pub enum StmtKind {
// Control flow
If {
cond: Expr,
cond: Spanned<ExprKind>,
body: Block,
},
Loop {
@ -124,11 +142,11 @@ pub enum StmtKind {
Var {
ident: Ident,
init: Option<Expr>,
init: Option<Spanned<ExprKind>>,
},
Assign {
assignable: Assignable,
value: Expr,
value: Spanned<ExprKind>,
},
Functio {
@ -138,70 +156,40 @@ pub enum StmtKind {
},
BfFunctio {
ident: Ident,
tape_len: Option<Expr>,
tape_len: Option<Spanned<ExprKind>>,
code: Vec<u8>,
},
Call {
expr: Expr,
args: Vec<Expr>,
expr: Spanned<ExprKind>,
args: Vec<Spanned<ExprKind>>,
},
Print(Expr),
Print(Spanned<ExprKind>),
Read(Assignable),
Melo(Ident),
Rlyeh,
Rickroll,
}
impl Stmt {
pub fn new(kind: StmtKind, span: Span) -> Self {
Self { kind, span }
}
}
/// Expression is parse unit which do not cause any effect,
/// like math and logical operations or values.
#[derive(Debug, Clone)]
pub struct Expr {
pub kind: ExprKind,
pub span: Span,
}
impl PartialEq for Expr {
fn eq(&self, other: &Self) -> bool {
self.kind == other.kind
}
}
impl Hash for Expr {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.kind.hash(state)
}
}
#[derive(Debug, PartialEq, Clone, Hash)]
pub enum ExprKind {
BinOp {
lhs: Box<Expr>,
rhs: Box<Expr>,
lhs: Box<Spanned<ExprKind>>,
rhs: Box<Spanned<ExprKind>>,
kind: BinOpKind,
},
Not(Box<Expr>),
Not(Box<Spanned<ExprKind>>),
Literal(Value),
Cart(Vec<(Expr, Expr)>),
Cart(Vec<(Spanned<ExprKind>, Spanned<ExprKind>)>),
Index {
expr: Box<Expr>,
index: Box<Expr>,
expr: Box<Spanned<ExprKind>>,
index: Box<Spanned<ExprKind>>,
},
Len(Box<Expr>),
Len(Box<Spanned<ExprKind>>),
Variable(String),
}
impl Expr {
pub fn new(kind: ExprKind, span: Span) -> Self {
Self { kind, span }
}
}
#[derive(Debug, PartialEq, Clone, Hash)]
pub enum BinOpKind {
Add,

27
ablescript/src/interpret.rs
View File

@ -19,7 +19,7 @@ use std::{
use rand::random;
use crate::{
ast::{Assignable, AssignableKind, Expr, ExprKind, Ident, Stmt, StmtKind},
ast::{Assignable, AssignableKind, ExprKind, Ident, Spanned, StmtKind},
base_55,
consts::ablescript_consts,
error::{Error, ErrorKind},
@ -108,7 +108,7 @@ impl ExecEnv {
/// Execute a set of Statements in the root stack frame. Return an
/// error if one or more of the Stmts failed to evaluate, or if a
/// `break` or `hopback` statement occurred at the top level.
pub fn eval_stmts(&mut self, stmts: &[Stmt]) -> Result<(), Error> {
pub fn eval_stmts(&mut self, stmts: &[Spanned<StmtKind>]) -> Result<(), Error> {
match self.eval_stmts_hs(stmts, false)? {
HaltStatus::Finished => Ok(()),
HaltStatus::Break(span) | HaltStatus::Hopback(span) => Err(Error {
@ -126,7 +126,11 @@ impl ExecEnv {
///
/// `interpret`-internal code should typically prefer this
/// function over `eval_stmts`.
fn eval_stmts_hs(&mut self, stmts: &[Stmt], stackframe: bool) -> Result<HaltStatus, Error> {
fn eval_stmts_hs(
&mut self,
stmts: &[Spanned<StmtKind>],
stackframe: bool,
) -> Result<HaltStatus, Error> {
let init_depth = self.stack.len();
if stackframe {
@ -151,11 +155,11 @@ impl ExecEnv {
}
/// Evaluate an Expr, returning its value or an error.
fn eval_expr(&self, expr: &Expr) -> Result<Value, Error> {
fn eval_expr(&self, expr: &Spanned<ExprKind>) -> Result<Value, Error> {
use crate::ast::BinOpKind::*;
use crate::ast::ExprKind::*;
Ok(match &expr.kind {
Ok(match &expr.item {
BinOp { lhs, rhs, kind } => {
let lhs = self.eval_expr(lhs)?;
let rhs = self.eval_expr(rhs)?;
@ -204,8 +208,8 @@ impl ExecEnv {
}
/// Perform the action indicated by a statement.
fn eval_stmt(&mut self, stmt: &Stmt) -> Result<HaltStatus, Error> {
match &stmt.kind {
fn eval_stmt(&mut self, stmt: &Spanned<StmtKind>) -> Result<HaltStatus, Error> {
match &stmt.item {
StmtKind::Print(expr) => {
println!("{}", self.eval_expr(expr)?);
}
@ -353,13 +357,18 @@ impl ExecEnv {
/// Call a function with the given arguments (i.e., actual
/// parameters). If the function invocation fails for some reason,
/// report the error at `span`.
fn fn_call(&mut self, func: Functio, args: &[Expr], span: &Range<usize>) -> Result<(), Error> {
fn fn_call(
&mut self,
func: Functio,
args: &[Spanned<ExprKind>],
span: &Range<usize>,
) -> Result<(), Error> {
// Arguments that are ExprKind::Variable are pass by
// reference; all other expressions are pass by value.
let args = args
.iter()
.map(|arg| {
if let ExprKind::Variable(name) = &arg.kind {
if let ExprKind::Variable(name) = &arg.item {
self.get_var_rc(&Ident {
ident: name.to_owned(),
span: arg.span.clone(),

50
ablescript/src/parser.rs
View File

@ -29,7 +29,7 @@ impl<'source> Parser<'source> {
/// Start parsing tokens
///
/// Loops trough lexer, parses statements, returns AST
pub fn init(&mut self) -> Result<Vec<Stmt>, Error> {
pub fn init(&mut self) -> Result<Vec<Spanned<StmtKind>>, Error> {
let mut ast = vec![];
while let Some(token) = self.lexer.next() {
match token {
@ -64,32 +64,32 @@ impl<'source> Parser<'source> {
///
/// This function will route to corresponding flow functions
/// which may advance the lexer iterator
fn parse(&mut self, token: Token) -> Result<Stmt, Error> {
fn parse(&mut self, token: Token) -> Result<Spanned<StmtKind>, Error> {
let start = self.lexer.span().start;
match token {
Token::If => Ok(Stmt::new(self.if_flow()?, start..self.lexer.span().end)),
Token::Functio => Ok(Stmt::new(
Token::If => Ok(Spanned::new(self.if_flow()?, start..self.lexer.span().end)),
Token::Functio => Ok(Spanned::new(
self.functio_flow()?,
start..self.lexer.span().end,
)),
Token::Bff => Ok(Stmt::new(self.bff_flow()?, start..self.lexer.span().end)),
Token::Var => Ok(Stmt::new(self.var_flow()?, start..self.lexer.span().end)),
Token::Melo => Ok(Stmt::new(self.melo_flow()?, start..self.lexer.span().end)),
Token::Loop => Ok(Stmt::new(self.loop_flow()?, start..self.lexer.span().end)),
Token::Break => Ok(Stmt::new(
Token::Bff => Ok(Spanned::new(self.bff_flow()?, start..self.lexer.span().end)),
Token::Var => Ok(Spanned::new(self.var_flow()?, start..self.lexer.span().end)),
Token::Melo => Ok(Spanned::new(self.melo_flow()?, start..self.lexer.span().end)),
Token::Loop => Ok(Spanned::new(self.loop_flow()?, start..self.lexer.span().end)),
Token::Break => Ok(Spanned::new(
self.semicolon_terminated(StmtKind::Break)?,
start..self.lexer.span().end,
)),
Token::HopBack => Ok(Stmt::new(
Token::HopBack => Ok(Spanned::new(
self.semicolon_terminated(StmtKind::HopBack)?,
start..self.lexer.span().end,
)),
Token::Rlyeh => Ok(Stmt::new(
Token::Rlyeh => Ok(Spanned::new(
self.semicolon_terminated(StmtKind::Rlyeh)?,
start..self.lexer.span().end,
)),
Token::Rickroll => Ok(Stmt::new(
Token::Rickroll => Ok(Spanned::new(
self.semicolon_terminated(StmtKind::Rickroll)?,
start..self.lexer.span().end,
)),
@ -99,7 +99,7 @@ impl<'source> Parser<'source> {
| Token::Integer(_)
| Token::Not
| Token::LeftBracket
| Token::LeftParen => Ok(Stmt::new(
| Token::LeftParen => Ok(Spanned::new(
self.value_flow(token)?,
start..self.lexer.span().end,
)),
@ -147,7 +147,7 @@ impl<'source> Parser<'source> {
/// AbleScript strongly separates expressions from statements.
/// Expressions do not have any side effects and the are
/// only mathematial and logical operations or values.
fn parse_expr(&mut self, token: Token, buf: &mut Option<Expr>) -> Result<Expr, Error> {
fn parse_expr(&mut self, token: Token, buf: &mut Option<Spanned<ExprKind>>) -> Result<Spanned<ExprKind>, Error> {
let start = match buf {
Some(e) => e.span.start,
None => self.lexer.span().start,
@ -155,7 +155,7 @@ impl<'source> Parser<'source> {
match token {
// Values
Token::Identifier(i) => Ok(Expr::new(
Token::Identifier(i) => Ok(Spanned::new(
ExprKind::Variable(if self.tdark {
i.replace("lang", "script")
} else {
@ -163,11 +163,11 @@ impl<'source> Parser<'source> {
}),
start..self.lexer.span().end,
)),
Token::Integer(i) => Ok(Expr::new(
Token::Integer(i) => Ok(Spanned::new(
ExprKind::Literal(Value::Int(i)),
start..self.lexer.span().end,
)),
Token::String(s) => Ok(Expr::new(
Token::String(s) => Ok(Spanned::new(
ExprKind::Literal(Value::Str(if self.tdark {
s.replace("lang", "script")
} else {
@ -177,11 +177,11 @@ impl<'source> Parser<'source> {
)),
Token::LeftBracket => match buf.take() {
Some(buf) => Ok(Expr::new(
Some(buf) => Ok(Spanned::new(
self.index_flow(buf)?,
start..self.lexer.span().end,
)),
None => Ok(Expr::new(self.cart_flow()?, start..self.lexer.span().end)),
None => Ok(Spanned::new(self.cart_flow()?, start..self.lexer.span().end)),
},
// Operations
@ -192,7 +192,7 @@ impl<'source> Parser<'source> {
| Token::EqualEqual
| Token::NotEqual
| Token::LessThan
| Token::GreaterThan => Ok(Expr::new(
| Token::GreaterThan => Ok(Spanned::new(
self.binop_flow(
BinOpKind::from_token(token).map_err(|e| Error::new(e, self.lexer.span()))?,
buf,
@ -200,7 +200,7 @@ impl<'source> Parser<'source> {
start..self.lexer.span().end,
)),
Token::Not => Ok(Expr::new(
Token::Not => Ok(Spanned::new(
{
let next = self.checked_next()?;
ExprKind::Not(Box::new(self.parse_expr(next, buf)?))
@ -262,7 +262,7 @@ impl<'source> Parser<'source> {
/// Flow for indexing operations
///
/// Indexing with empty index resolves to length of expression, else it indexes
fn index_flow(&mut self, expr: Expr) -> Result<ExprKind, Error> {
fn index_flow(&mut self, expr: Spanned<ExprKind>) -> Result<ExprKind, Error> {
let mut buf = None;
Ok(loop {
match self.checked_next()? {
@ -285,7 +285,7 @@ impl<'source> Parser<'source> {
/// Generates operation from LHS buffer and next expression as RHS
///
/// This is unaware of precedence, as AbleScript do not have it
fn binop_flow(&mut self, kind: BinOpKind, lhs: &mut Option<Expr>) -> Result<ExprKind, Error> {
fn binop_flow(&mut self, kind: BinOpKind, lhs: &mut Option<Spanned<ExprKind>>) -> Result<ExprKind, Error> {
Ok(ExprKind::BinOp {
lhs: Box::new(
lhs.take()
@ -303,7 +303,7 @@ impl<'source> Parser<'source> {
}
/// Parse expressions until terminate token
fn expr_flow(&mut self, terminate: Token) -> Result<Expr, Error> {
fn expr_flow(&mut self, terminate: Token) -> Result<Spanned<ExprKind>, Error> {
let mut buf = None;
Ok(loop {
match self.checked_next()? {
@ -497,7 +497,7 @@ impl<'source> Parser<'source> {
}
/// Parse functio call flow
fn functio_call_flow(&mut self, expr: Expr) -> Result<StmtKind, Error> {
fn functio_call_flow(&mut self, expr: Spanned<ExprKind>) -> Result<StmtKind, Error> {
let mut args = vec![];
let mut buf = None;
loop {

4
ablescript/src/variables.rs
View File

@ -12,7 +12,7 @@ use std::{
use rand::Rng;
use crate::{ast::Stmt, brian::INSTRUCTION_MAPPINGS, consts};
use crate::{brian::INSTRUCTION_MAPPINGS, consts, ast::{Spanned, StmtKind}};
#[derive(Debug, Clone, Copy, PartialEq, PartialOrd)]
pub enum Abool {
@ -58,7 +58,7 @@ pub enum Functio {
},
Able {
params: Vec<String>,
body: Vec<Stmt>,
body: Vec<Spanned<StmtKind>>,
},
Builtin(BuiltinFunctio),
Chain {