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Add line/position in compilation errors; Add compile to AST; FIx infinite loop in close parens.

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This commit is contained in:
Stephen Chung 2020-02-24 23:25:52 +08:00
parent b3247204c6
commit e4e471fd20
5 changed files with 715 additions and 477 deletions
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178
src/engine.rs
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@ -9,13 +9,14 @@ use std::{convert::TryInto, sync::Arc};
use crate::any::{Any, AnyExt};
use crate::call::FunArgs;
use crate::fn_register::{RegisterBoxFn, RegisterFn};
use crate::parser::{lex, parse, Expr, FnDef, Stmt};
use crate::parser::{lex, parse, Expr, FnDef, ParseError, Stmt, AST};
use fmt::{Debug, Display};
type Array = Vec<Box<dyn Any>>;
#[derive(Debug)]
#[derive(Debug, Clone)]
pub enum EvalAltResult {
ErrorParseError(ParseError),
ErrorFunctionNotFound(String),
ErrorFunctionArgMismatch,
ErrorArrayOutOfBounds(usize, i64),
@ -27,20 +28,20 @@ pub enum EvalAltResult {
ErrorAssignmentToUnknownLHS,
ErrorMismatchOutputType(String),
ErrorCantOpenScriptFile(String),
InternalErrorMalformedDotExpression,
ErrorMalformedDotExpression,
LoopBreak,
Return(Box<dyn Any>),
}
impl EvalAltResult {
fn as_str(&self) -> Option<&str> {
match *self {
EvalAltResult::ErrorCantOpenScriptFile(ref s) => Some(s.as_str()),
EvalAltResult::ErrorVariableNotFound(ref s) => Some(s.as_str()),
EvalAltResult::ErrorFunctionNotFound(ref s) => Some(s.as_str()),
EvalAltResult::ErrorMismatchOutputType(ref s) => Some(s.as_str()),
_ => None,
}
Some(match *self {
EvalAltResult::ErrorCantOpenScriptFile(ref s)
| EvalAltResult::ErrorVariableNotFound(ref s)
| EvalAltResult::ErrorFunctionNotFound(ref s)
| EvalAltResult::ErrorMismatchOutputType(ref s) => s,
_ => return None,
})
}
}
@ -49,6 +50,7 @@ impl PartialEq for EvalAltResult {
use EvalAltResult::*;
match (self, other) {
(&ErrorParseError(ref a), &ErrorParseError(ref b)) => a == b,
(&ErrorFunctionNotFound(ref a), &ErrorFunctionNotFound(ref b)) => a == b,
(&ErrorFunctionArgMismatch, &ErrorFunctionArgMismatch) => true,
(&ErrorIndexMismatch, &ErrorIndexMismatch) => true,
@ -62,7 +64,7 @@ impl PartialEq for EvalAltResult {
(&ErrorAssignmentToUnknownLHS, &ErrorAssignmentToUnknownLHS) => true,
(&ErrorMismatchOutputType(ref a), &ErrorMismatchOutputType(ref b)) => a == b,
(&ErrorCantOpenScriptFile(ref a), &ErrorCantOpenScriptFile(ref b)) => a == b,
(&InternalErrorMalformedDotExpression, &InternalErrorMalformedDotExpression) => true,
(&ErrorMalformedDotExpression, &ErrorMalformedDotExpression) => true,
(&LoopBreak, &LoopBreak) => true,
_ => false,
}
@ -72,6 +74,7 @@ impl PartialEq for EvalAltResult {
impl Error for EvalAltResult {
fn description(&self) -> &str {
match *self {
EvalAltResult::ErrorParseError(ref p) => p.description(),
EvalAltResult::ErrorFunctionNotFound(_) => "Function not found",
EvalAltResult::ErrorFunctionArgMismatch => "Function argument types do not match",
EvalAltResult::ErrorIndexMismatch => "Array access expects integer index",
@ -85,15 +88,13 @@ impl Error for EvalAltResult {
EvalAltResult::ErrorForMismatch => "For loops expect array",
EvalAltResult::ErrorVariableNotFound(_) => "Variable not found",
EvalAltResult::ErrorAssignmentToUnknownLHS => {
"Assignment to an unsupported left-hand side"
"Assignment to an unsupported left-hand side expression"
}
EvalAltResult::ErrorMismatchOutputType(_) => "Cast of output failed",
EvalAltResult::ErrorMismatchOutputType(_) => "Output type is incorrect",
EvalAltResult::ErrorCantOpenScriptFile(_) => "Cannot open script file",
EvalAltResult::InternalErrorMalformedDotExpression => {
"[Internal error] Unexpected expression in dot expression"
}
EvalAltResult::LoopBreak => "Loop broken before completion (not an error)",
EvalAltResult::Return(_) => "Function returned value (not an error)",
EvalAltResult::ErrorMalformedDotExpression => "Malformed dot expression",
EvalAltResult::LoopBreak => "[Not Error] Breaks out of loop",
EvalAltResult::Return(_) => "[Not Error] Function returns value",
}
}
@ -108,6 +109,7 @@ impl fmt::Display for EvalAltResult {
write!(f, "{}: {}", self.description(), s)
} else {
match self {
EvalAltResult::ErrorParseError(ref p) => write!(f, "Syntax error: {}", p),
EvalAltResult::ErrorArrayOutOfBounds(_, index) if *index < 0 => {
write!(f, "{}: {} < 0", self.description(), index)
}
@ -224,7 +226,11 @@ impl Engine {
.iter()
.map(|x| (*(&**x).box_clone()).type_name())
.collect::<Vec<_>>();
EvalAltResult::ErrorFunctionNotFound(format!("{} ({})", ident, typenames.join(",")))
EvalAltResult::ErrorFunctionNotFound(format!(
"{} ({})",
ident,
typenames.join(", ")
))
})
.and_then(move |f| match **f {
FnIntExt::Ext(ref f) => f(args),
@ -308,7 +314,7 @@ impl Engine {
use std::iter::once;
match *dot_rhs {
Expr::FnCall(ref fn_name, ref args) => {
Expr::FunctionCall(ref fn_name, ref args) => {
let mut args: Array = args
.iter()
.map(|arg| self.eval_expr(scope, arg))
@ -351,9 +357,9 @@ impl Engine {
self.call_fn_raw(get_fn_name, vec![this_ptr])
.and_then(|mut v| self.get_dot_val_helper(scope, v.as_mut(), inner_rhs))
}
_ => Err(EvalAltResult::InternalErrorMalformedDotExpression),
_ => Err(EvalAltResult::ErrorMalformedDotExpression),
},
_ => Err(EvalAltResult::InternalErrorMalformedDotExpression),
_ => Err(EvalAltResult::ErrorMalformedDotExpression),
}
}
@ -429,7 +435,7 @@ impl Engine {
value
}
_ => Err(EvalAltResult::InternalErrorMalformedDotExpression),
_ => Err(EvalAltResult::ErrorMalformedDotExpression),
}
}
@ -458,9 +464,9 @@ impl Engine {
self.call_fn_raw(set_fn_name, vec![this_ptr, v.as_mut()])
})
}
_ => Err(EvalAltResult::InternalErrorMalformedDotExpression),
_ => Err(EvalAltResult::ErrorMalformedDotExpression),
},
_ => Err(EvalAltResult::InternalErrorMalformedDotExpression),
_ => Err(EvalAltResult::ErrorMalformedDotExpression),
}
}
@ -492,16 +498,16 @@ impl Engine {
value
}
_ => Err(EvalAltResult::InternalErrorMalformedDotExpression),
_ => Err(EvalAltResult::ErrorMalformedDotExpression),
}
}
fn eval_expr(&self, scope: &mut Scope, expr: &Expr) -> Result<Box<dyn Any>, EvalAltResult> {
match *expr {
Expr::IntConst(i) => Ok(Box::new(i)),
Expr::FloatConst(i) => Ok(Box::new(i)),
Expr::StringConst(ref s) => Ok(Box::new(s.clone())),
Expr::CharConst(ref c) => Ok(Box::new(*c)),
Expr::IntegerConstant(i) => Ok(Box::new(i)),
Expr::FloatConstant(i) => Ok(Box::new(i)),
Expr::StringConstant(ref s) => Ok(Box::new(s.clone())),
Expr::CharConstant(ref c) => Ok(Box::new(*c)),
Expr::Identifier(ref id) => {
for &mut (ref name, ref mut val) in &mut scope.iter_mut().rev() {
if *id == *name {
@ -575,7 +581,7 @@ impl Engine {
Ok(Box::new(arr))
}
Expr::FnCall(ref fn_name, ref args) => self.call_fn_raw(
Expr::FunctionCall(ref fn_name, ref args) => self.call_fn_raw(
fn_name.to_owned(),
args.iter()
.map(|ex| self.eval_expr(scope, ex))
@ -687,7 +693,7 @@ impl Engine {
let result = self.eval_expr(scope, a)?;
Err(EvalAltResult::Return(result))
}
Stmt::Var(ref name, ref init) => {
Stmt::Let(ref name, ref init) => {
match *init {
Some(ref v) => {
let i = self.eval_expr(scope, v)?;
@ -700,6 +706,34 @@ impl Engine {
}
}
/// Compile a string into an AST
pub fn compile(input: &str) -> Result<AST, ParseError> {
let tokens = lex(input);
let mut peekables = tokens.peekable();
let tree = parse(&mut peekables);
tree
}
/// Compile a file into an AST
pub fn compile_file(fname: &str) -> Result<AST, EvalAltResult> {
use std::fs::File;
use std::io::prelude::*;
if let Ok(mut f) = File::open(fname) {
let mut contents = String::new();
if f.read_to_string(&mut contents).is_ok() {
Self::compile(&contents).map_err(|err| EvalAltResult::ErrorParseError(err))
} else {
Err(EvalAltResult::ErrorCantOpenScriptFile(fname.to_owned()))
}
} else {
Err(EvalAltResult::ErrorCantOpenScriptFile(fname.to_owned()))
}
}
/// Evaluate a file
pub fn eval_file<T: Any + Clone>(&mut self, fname: &str) -> Result<T, EvalAltResult> {
use std::fs::File;
@ -721,23 +755,32 @@ impl Engine {
/// Evaluate a string
pub fn eval<T: Any + Clone>(&mut self, input: &str) -> Result<T, EvalAltResult> {
let mut scope = Scope::new();
self.eval_with_scope(&mut scope, input)
}
/// Evaluate with own scope
/// Evaluate a string with own scope
pub fn eval_with_scope<T: Any + Clone>(
&mut self,
scope: &mut Scope,
input: &str,
) -> Result<T, EvalAltResult> {
let tokens = lex(input);
let ast = Self::compile(input).map_err(|err| EvalAltResult::ErrorParseError(err))?;
self.eval_ast_with_scope(scope, &ast)
}
let mut peekables = tokens.peekable();
let tree = parse(&mut peekables);
/// Evaluate an AST
pub fn eval_ast<T: Any + Clone>(&mut self, ast: &AST) -> Result<T, EvalAltResult> {
let mut scope = Scope::new();
self.eval_ast_with_scope(&mut scope, ast)
}
match tree {
Ok((ref os, ref fns)) => {
/// Evaluate an AST with own scope
pub fn eval_ast_with_scope<T: Any + Clone>(
&mut self,
scope: &mut Scope,
ast: &AST,
) -> Result<T, EvalAltResult> {
let AST(os, fns) = ast;
let mut x: Result<Box<dyn Any>, EvalAltResult> = Ok(Box::new(()));
for f in fns {
@ -766,9 +809,6 @@ impl Engine {
Err(a) => Err(EvalAltResult::ErrorMismatchOutputType((*a).type_name())),
}
}
Err(_) => Err(EvalAltResult::ErrorFunctionArgMismatch),
}
}
/// Evaluate a file, but only return errors, if there are any.
/// Useful for when you don't need the result, but still need
@ -815,7 +855,7 @@ impl Engine {
let tree = parse(&mut peekables);
match tree {
Ok((ref os, ref fns)) => {
Ok(AST(ref os, ref fns)) => {
for f in fns {
if f.params.len() > 6 {
return Ok(());
@ -878,7 +918,7 @@ impl Engine {
)
}
macro_rules! reg_func2 {
macro_rules! reg_func2x {
($engine:expr, $x:expr, $op:expr, $v:ty, $r:ty, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(x: $v, y: $y)->$r);
@ -886,7 +926,7 @@ impl Engine {
)
}
macro_rules! reg_func2b {
macro_rules! reg_func2y {
($engine:expr, $x:expr, $op:expr, $v:ty, $r:ty, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(y: $y, x: $v)->$r);
@ -1018,54 +1058,42 @@ impl Engine {
reg_func1!(engine, "print", print, (), i32, i64, u32, u64);
reg_func1!(engine, "print", print, (), f32, f64, bool, String);
reg_func1!(engine, "print", print_debug, (), Array);
engine.register_fn("print", |_: ()| println!());
reg_func1!(engine, "debug", print_debug, (), i32, i64, u32, u64);
reg_func1!(engine, "debug", print_debug, (), f32, f64, bool, String);
reg_func1!(engine, "debug", print_debug, (), Array);
reg_func1!(engine, "debug", print_debug, (), Array, ());
// Register array functions
fn push<T: Any + 'static>(list: &mut Array, item: T) {
list.push(Box::new(item));
}
fn pop(list: &mut Array) -> Box<dyn Any> {
list.pop().unwrap()
}
fn shift(list: &mut Array) -> Box<dyn Any> {
list.remove(0)
}
fn len(list: &mut Array) -> i64 {
reg_func2x!(engine, "push", push, &mut Array, (), i32, i64, u32, u64);
reg_func2x!(engine, "push", push, &mut Array, (), f32, f64, bool);
reg_func2x!(engine, "push", push, &mut Array, (), String, Array, ());
engine.register_box_fn("pop", |list: &mut Array| list.pop().unwrap());
engine.register_box_fn("shift", |list: &mut Array| list.remove(0));
engine.register_fn("len", |list: &mut Array| -> i64 {
list.len().try_into().unwrap()
}
reg_func2!(engine, "push", push, &mut Array, (), i32, i64, u32, u64);
reg_func2!(engine, "push", push, &mut Array, (), f32, f64, bool);
reg_func2!(engine, "push", push, &mut Array, (), String, Array);
engine.register_box_fn("pop", pop);
engine.register_box_fn("shift", shift);
engine.register_fn("len", len);
});
// Register string concatenate functions
fn prepend<T: Display>(x: T, y: String) -> String {
format!("{}{}", x, y)
}
fn append<T: Display>(x: &mut String, y: T) -> String {
fn append<T: Display>(x: String, y: T) -> String {
format!("{}{}", x, y)
}
fn prepend_array(x: Array, y: String) -> String {
format!("{:?}{}", x, y)
}
fn append_array(x: &mut String, y: Array) -> String {
format!("{}{:?}", x, y)
}
reg_func2!(engine, "+", append, &mut String, String, i32, i64);
reg_func2!(engine, "+", append, &mut String, String, u32, u64);
reg_func2!(engine, "+", append, &mut String, String, f32, f64, bool);
engine.register_fn("+", append_array);
reg_func2x!(engine, "+", append, String, String, i32, i64, u32, u64, f32, f64, bool);
engine.register_fn("+", |x: String, y: Array| format!("{}{:?}", x, y));
engine.register_fn("+", |x: String, _: ()| format!("{}", x));
reg_func2b!(engine, "+", prepend, String, String, i32, i64, u32, u64, f32, f64, bool);
engine.register_fn("+", prepend_array);
reg_func2y!(engine, "+", prepend, String, String, i32, i64, u32, u64, f32, f64, bool);
engine.register_fn("+", |x: Array, y: String| format!("{:?}{}", x, y));
engine.register_fn("+", |_: (), y: String| format!("{}", y));
// Register array iterator
engine.register_iterator::<Array, _>(|a| {

1
src/lib.rs
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@ -48,3 +48,4 @@ mod parser;
pub use any::Any;
pub use engine::{Engine, EvalAltResult, Scope};
pub use fn_register::{RegisterBoxFn, RegisterFn};
pub use parser::{ParseError, ParseErrorType, AST};

859
src/parser.rs
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