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update (fix?) partial function application stack discipline

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This commit is contained in:
Scott Richmond 2025-06-23 21:22:28 -04:00
parent 772c56a6df
commit 0290bb3bf2
4 changed files with 44 additions and 40 deletions
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76
sandbox.ld
View File

@ -1,37 +1,41 @@
fn apply_command {
"Takes a turtle state and a command and calculates a new state."
(state, command) -> match command with {
(:goto, (x, y)) -> assoc (state, :position, (x, y))
(:home) -> do state >
assoc (_, :position, (0, 0)) >
assoc (_, :heading, 0)
(:clear) -> do state >
assoc (state, :position, (0, 0)) >
assoc (_, :heading, 0)
(:right, turns) -> update (state, :heading, add (_, turns))
(:left, turns) -> update (state, :heading, sub (_, turns))
(:forward, steps) -> {
let #{heading, position, ...} = state
let unit = heading/vector (heading)
let vect = mult (steps, unit)
update (state, :position, add (vect, _))
}
(:back, steps) -> {
let #{heading, position, ...} = state
let unit = heading/vector (heading)
let vect = mult (steps, unit)
update (state, :position, sub (_, vect))
}
(:penup) -> assoc (state, :pendown?, false)
(:pendown) -> assoc (state, :pendown?, true)
(:penwidth, pixels) -> assoc (state, :penwidth, pixels)
(:pencolor, color) -> assoc (state, :pencolor, color)
(:setheading, heading) -> assoc (state, :heading, heading)
(:loadstate, position, heading, visible?, pendown?, penwidth, pencolor) -> #{position, heading, visible?, pendown?, penwidth, pencolor}
(:show) -> assoc (state, :visible?, true)
(:hide) -> assoc (state, :visible?, false)
(:background, _) -> state
}
}
& fn apply_command {
& "Takes a turtle state and a command and calculates a new state."
& (state, command) -> match command with {
& (:goto, (x, y)) -> assoc (state, :position, (x, y))
& (:home) -> do state >
& assoc (_, :position, (0, 0)) >
& assoc (_, :heading, 0)
& (:clear) -> do state >
& assoc (state, :position, (0, 0)) >
& assoc (_, :heading, 0)
& (:right, turns) -> update (state, :heading, add (_, turns))
& (:left, turns) -> update (state, :heading, sub (_, turns))
& (:forward, steps) -> {
& let #{heading, position, ...} = state
& let unit = heading/vector (heading)
& let vect = mult (steps, unit)
& update (state, :position, add (vect, _))
& }
& (:back, steps) -> {
& let #{heading, position, ...} = state
& let unit = heading/vector (heading)
& let vect = mult (steps, unit)
& update (state, :position, sub (_, vect))
& }
& (:penup) -> assoc (state, :pendown?, false)
& (:pendown) -> assoc (state, :pendown?, true)
& (:penwidth, pixels) -> assoc (state, :penwidth, pixels)
& (:pencolor, color) -> assoc (state, :pencolor, color)
& (:setheading, heading) -> assoc (state, :heading, heading)
& (:loadstate, position, heading, visible?, pendown?, penwidth, pencolor) -> #{position, heading, visible?, pendown?, penwidth, pencolor}
& (:show) -> assoc (state, :visible?, true)
& (:hide) -> assoc (state, :visible?, false)
& (:background, _) -> state
& }
& }
apply_command (turtle_init, (:penup))
fn many_args (_, _, x, _) -> x
let fewer_args = many_args (:foo, :bar, _, :baz)
fewer_args(:quux)

2
src/compiler.rs
View File

@ -917,7 +917,7 @@ impl Compiler {
self.resolve_binding(fn_name);
self.emit_op(Op::Partial);
self.emit_byte(arity);
self.stack_depth -= 1;
self.stack_depth -= args.len() - 1;
} else {
match get_builtin(fn_name, args.len()) {
Some(code) => {

2
src/main.rs
View File

@ -4,7 +4,7 @@ use std::env;
use std::fs;
const DEBUG_SCRIPT_COMPILE: bool = false;
const DEBUG_SCRIPT_RUN: bool = false;
const DEBUG_SCRIPT_RUN: bool = true;
const DEBUG_PRELUDE_COMPILE: bool = false;
const DEBUG_PRELUDE_RUN: bool = false;

4
src/vm.rs
View File

@ -1000,7 +1000,7 @@ impl Vm {
let mut frame = CallFrame {
function: the_fn,
arity: args.len() as u8,
stack_base: self.stack.len() - arity as usize - 1,
stack_base: self.stack.len() - args.len(),
ip: 0,
};
@ -1090,7 +1090,7 @@ impl Vm {
let mut frame = CallFrame {
function: the_fn,
arity: args.len() as u8,
stack_base: self.stack.len() - arity as usize - 1,
stack_base: self.stack.len() - args.len(),
ip: 0,
};