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add correct eval scope

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This commit is contained in:
JT 2021-07-30 17:42:33 +12:00
parent 1caae90c02
commit 2af61bd07e
3 changed files with 59 additions and 27 deletions
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70
src/eval.rs
View File

@ -1,4 +1,4 @@
use std::{collections::HashMap, fmt::Display};
use std::{cell::RefCell, collections::HashMap, fmt::Display, rc::Rc};
use crate::{
parser::Operator, Block, BlockId, Call, Expr, Expression, ParserState, Span, Statement, VarId,
@ -59,13 +59,17 @@ pub struct State<'a> {
pub parser_state: &'a ParserState,
}
pub struct Stack {
pub struct StackFrame {
pub vars: HashMap<VarId, Value>,
pub parent: Option<Stack>,
}
impl Stack {
pub fn get_var(&self, var_id: VarId) -> Result<Value, ShellError> {
match self.vars.get(&var_id) {
pub type Stack = Rc<RefCell<StackFrame>>;
impl StackFrame {
pub fn get_var(this: Stack, var_id: VarId) -> Result<Value, ShellError> {
let this = this.borrow();
match this.vars.get(&var_id) {
Some(v) => Ok(v.clone()),
_ => {
println!("var_id: {}", var_id);
@ -74,14 +78,32 @@ impl Stack {
}
}
pub fn add_var(&mut self, var_id: VarId, value: Value) {
self.vars.insert(var_id, value);
pub fn add_var(this: Stack, var_id: VarId, value: Value) {
let mut this = this.borrow_mut();
this.vars.insert(var_id, value);
}
pub fn enter_scope(this: Stack) -> Stack {
Rc::new(RefCell::new(StackFrame {
vars: HashMap::new(),
parent: Some(this),
}))
}
pub fn print_stack(&self) {
println!("===frame===");
for (var, val) in &self.vars {
println!("{}: {:?}", var, val);
}
if let Some(parent) = &self.parent {
parent.borrow().print_stack()
}
}
}
pub fn eval_operator(
_state: &State,
_stack: &mut Stack,
_stack: Stack,
op: &Expression,
) -> Result<Operator, ShellError> {
match op {
@ -93,7 +115,7 @@ pub fn eval_operator(
}
}
fn eval_call(state: &State, stack: &mut Stack, call: &Call) -> Result<Value, ShellError> {
fn eval_call(state: &State, stack: Stack, call: &Call) -> Result<Value, ShellError> {
let decl = state.parser_state.get_decl(call.decl_id);
if let Some(block_id) = decl.body {
for (arg, param) in call
@ -101,14 +123,15 @@ fn eval_call(state: &State, stack: &mut Stack, call: &Call) -> Result<Value, She
.iter()
.zip(decl.signature.required_positional.iter())
{
let result = eval_expression(state, stack, arg)?;
let result = eval_expression(state, stack.clone(), arg)?;
let var_id = param
.var_id
.expect("internal error: all custom parameters must have var_ids");
stack.add_var(var_id, result);
StackFrame::add_var(stack.clone(), var_id, result);
}
let block = state.parser_state.get_block(block_id);
let stack = StackFrame::enter_scope(stack);
eval_block(state, stack, block)
} else if decl.signature.name == "let" {
let var_id = call.positional[0]
@ -119,11 +142,11 @@ fn eval_call(state: &State, stack: &mut Stack, call: &Call) -> Result<Value, She
.as_keyword()
.expect("internal error: missing keyword");
let rhs = eval_expression(state, stack, keyword_expr)?;
let rhs = eval_expression(state, stack.clone(), keyword_expr)?;
println!("Adding: {:?} to {}", rhs, var_id);
stack.add_var(var_id, rhs);
StackFrame::add_var(stack, var_id, rhs);
Ok(Value::Unknown)
} else if decl.signature.name == "if" {
let cond = &call.positional[0];
@ -132,17 +155,19 @@ fn eval_call(state: &State, stack: &mut Stack, call: &Call) -> Result<Value, She
.expect("internal error: expected block");
let else_case = call.positional.get(2);
let result = eval_expression(state, stack, cond)?;
let result = eval_expression(state, stack.clone(), cond)?;
match result {
Value::Bool { val, .. } => {
if val {
let block = state.parser_state.get_block(then_block);
let stack = StackFrame::enter_scope(stack);
eval_block(state, stack, block)
} else if let Some(else_case) = else_case {
println!("{:?}", else_case);
if let Some(else_expr) = else_case.as_keyword() {
if let Some(block_id) = else_expr.as_block() {
let block = state.parser_state.get_block(block_id);
let stack = StackFrame::enter_scope(stack);
eval_block(state, stack, block)
} else {
eval_expression(state, stack, else_expr)
@ -160,7 +185,7 @@ fn eval_call(state: &State, stack: &mut Stack, call: &Call) -> Result<Value, She
let mut output = vec![];
for expr in &call.positional {
let val = eval_expression(state, stack, expr)?;
let val = eval_expression(state, stack.clone(), expr)?;
output.push(val.to_string());
}
@ -175,7 +200,7 @@ fn eval_call(state: &State, stack: &mut Stack, call: &Call) -> Result<Value, She
pub fn eval_expression(
state: &State,
stack: &mut Stack,
stack: Stack,
expr: &Expression,
) -> Result<Value, ShellError> {
match &expr.expr {
@ -187,13 +212,13 @@ pub fn eval_expression(
val: *i,
span: expr.span,
}),
Expr::Var(var_id) => stack.get_var(*var_id),
Expr::Var(var_id) => StackFrame::get_var(stack, *var_id),
Expr::Call(call) => eval_call(state, stack, call),
Expr::ExternalCall(_, _) => Err(ShellError::Unsupported(expr.span)),
Expr::Operator(_) => Ok(Value::Unknown),
Expr::BinaryOp(lhs, op, rhs) => {
let lhs = eval_expression(state, stack, lhs)?;
let op = eval_operator(state, stack, op)?;
let lhs = eval_expression(state, stack.clone(), lhs)?;
let op = eval_operator(state, stack.clone(), op)?;
let rhs = eval_expression(state, stack, rhs)?;
match op {
@ -205,13 +230,14 @@ pub fn eval_expression(
Expr::Subexpression(block_id) => {
let block = state.parser_state.get_block(*block_id);
let stack = StackFrame::enter_scope(stack);
eval_block(state, stack, block)
}
Expr::Block(block_id) => Ok(Value::Block(*block_id)),
Expr::List(x) => {
let mut output = vec![];
for expr in x {
output.push(eval_expression(state, stack, expr)?);
output.push(eval_expression(state, stack.clone(), expr)?);
}
Ok(Value::List(output))
}
@ -226,12 +252,12 @@ pub fn eval_expression(
}
}
pub fn eval_block(state: &State, stack: &mut Stack, block: &Block) -> Result<Value, ShellError> {
pub fn eval_block(state: &State, stack: Stack, block: &Block) -> Result<Value, ShellError> {
let mut last = Ok(Value::Unknown);
for stmt in &block.stmts {
if let Statement::Expression(expression) = stmt {
last = Ok(eval_expression(state, stack, expression)?);
last = Ok(eval_expression(state, stack.clone(), expression)?);
}
}

2
src/lib.rs
View File

@ -14,7 +14,7 @@ mod tests;
mod type_check;
pub use declaration::Declaration;
pub use eval::{eval_block, eval_expression, Stack, State};
pub use eval::{eval_block, eval_expression, Stack, StackFrame, State};
pub use lex::{lex, Token, TokenContents};
pub use lite_parse::{lite_parse, LiteBlock, LiteCommand, LiteStatement};
pub use parse_error::ParseError;

14
src/main.rs
View File

@ -1,7 +1,8 @@
use std::{cell::RefCell, collections::HashMap, rc::Rc};
use engine_q::{
eval_block, NuHighlighter, ParserState, ParserWorkingSet, Signature, Stack, State, SyntaxShape,
eval_block, NuHighlighter, ParserState, ParserWorkingSet, Signature, StackFrame, State,
SyntaxShape,
};
fn main() -> std::io::Result<()> {
@ -73,6 +74,8 @@ fn main() -> std::io::Result<()> {
working_set.add_decl(sig.into());
let sig = Signature::build("blocks");
working_set.add_decl(sig.into());
let sig = Signature::build("stack");
working_set.add_decl(sig.into());
let sig = Signature::build("add");
working_set.add_decl(sig.into());
@ -131,9 +134,10 @@ fn main() -> std::io::Result<()> {
let prompt = DefaultPrompt::new(1);
let mut current_line = 1;
let mut stack = Stack {
let stack = Rc::new(RefCell::new(StackFrame {
vars: HashMap::new(),
};
parent: None,
}));
loop {
let input = line_editor.read_line(&prompt)?;
@ -150,6 +154,8 @@ fn main() -> std::io::Result<()> {
} else if s.trim() == "blocks" {
parser_state.borrow().print_blocks();
continue;
} else if s.trim() == "stack" {
stack.borrow().print_stack();
}
// println!("input: '{}'", s);
@ -176,7 +182,7 @@ fn main() -> std::io::Result<()> {
parser_state: &*parser_state.borrow(),
};
let output = eval_block(&state, &mut stack, &block);
let output = eval_block(&state, stack.clone(), &block);
println!("{:#?}", output);
}
Signal::CtrlC => {