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[ITMO] A01 Artyom Muromskiy #1490

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[ITMO] A01 Artyom Muromskiy #1490

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a3b27a1
A01 implemented
heli0dus Oct 21, 2024
b0f4860
retriggering PR check
heli0dus Oct 31, 2024
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22 changes: 21 additions & 1 deletion src/Expr.lama
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Original file line number Diff line number Diff line change
Expand Up @@ -14,5 +14,25 @@ import State;
-- Binop (string, expr, expr)

public fun evalExpr (st, expr) {
failure ("evalExpr not implemented\n")
case expr of
Var (name) -> st(name)
| Const (value) -> value
| Binop (op, l, r) ->
case op of
"+" -> evalExpr(st, l) + evalExpr(st, r)
| "-" -> evalExpr(st, l) - evalExpr(st, r)
| "*" -> evalExpr(st, l) * evalExpr(st, r)
| "/" -> evalExpr(st, l) / evalExpr(st, r)
| "%" -> evalExpr(st, l) % evalExpr(st, r)
| "<" -> evalExpr(st, l) < evalExpr(st, r)
| "<=" -> evalExpr(st, l) <= evalExpr(st, r)
| ">" -> evalExpr(st, l) > evalExpr(st, r)
| ">=" -> evalExpr(st, l) >= evalExpr(st, r)
| "==" -> evalExpr(st, l) == evalExpr(st, r)
| "!=" -> evalExpr(st, l) != evalExpr(st, r)
| "&&" -> evalExpr(st, l) && evalExpr(st, r)
| "!!" -> evalExpr(st, l) !! evalExpr(st, r)
esac
esac
-- failure ("evalExpr not implemented\n")
}
58 changes: 55 additions & 3 deletions src/SM.lama
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Expand Up @@ -20,14 +20,54 @@ public fun showSMInsn (i) {
esac
}


public fun showSM (prg) {
map (fun (i) {showSMInsn (i) ++ "\n"}, prg).stringcat
}

-- Stack machine interpreter. Takes an SM-configuration and a program,
-- returns a final configuration
fun eval (c, insns) {
failure ("SM eval not implemented\n")
case c of [stack, st, rw] ->
case insns of
{} -> c
| ins:inss -> case ins of
READ -> case readWorld (rw) of
[res, rrw] -> eval ([res : c, st, rrw], inss)
esac
| WRITE -> case stack of
{} -> failure ("can't write from empty stack")
| x:xs -> eval ([xs, st, writeWorld(x, rw)], inss)
esac
| BINOP (s) -> case stack of
y:(x:xs) -> case s of
"+" -> eval ([(x + y) : xs, st, rw], inss)
| "-" -> eval ([(x - y) : xs, st, rw], inss)
| "*" -> eval ([(x * y) : xs, st, rw], inss)
| "/" -> eval ([(x / y) : xs, st, rw], inss)
| "%" -> eval ([(x % y) : xs, st, rw], inss)
| "<" -> eval ([(x < y) : xs, st, rw], inss)
| "<=" -> eval ([(x <= y) : xs, st, rw], inss)
| ">" -> eval ([(x > y) : xs, st, rw], inss)
| ">=" -> eval ([(x >= y) : xs, st, rw], inss)
| "==" -> eval ([(x == y) : xs, st, rw], inss)
| "!=" -> eval ([(x != y) : xs, st, rw], inss)
| "&&" -> eval ([(x && y) : xs, st, rw], inss)
| "!!" -> eval ([(x !! y) : xs, st, rw], inss)
esac
| _ -> failure ("can't take enough arguments from stack")
esac
| LD (x) -> eval ([(st (x)) : stack, st,rw], inss)
| ST (x) ->
case stack of
{} -> failure ("can't read from empty stack")
| y:xs -> eval ([xs, st <- [x, y], rw], inss)
esac
| CONST (n) -> eval ([n:stack, st, rw], inss)
esac
esac
esac
-- failure ("SM eval not implemented\n")
}

-- Runs a stack machine for a given input and a given program, returns an output
Expand All @@ -38,12 +78,24 @@ public fun evalSM (input, insns) {
-- Compiles an expression into a stack machine code.
-- Takes an expression, returns a list of stack machine instructions
fun compileExpr (expr) {
failure ("compileExpr not implemented\n")
case expr of
Var (v) -> {LD (v)}
| Const (v) -> {CONST (v)}
| Binop (op, lhs, rhs) -> compileExpr (lhs) +++ compileExpr (rhs) +++ {BINOP (op)}
esac
-- failure ("compileExpr not implemented\n")
}

-- Compiles a statement into a stack machine code.
-- Takes a statement, returns a list of stack machine
-- instructions.
public fun compileSM (stmt) {
failure ("compileSM not implemented\n")
case stmt of
Skip -> {}
| Assn (v, expr) -> compileExpr(expr) +++ {ST (v)}
| Write (expr) -> compileExpr(expr) +++ {WRITE}
| Read (v) -> {READ, ST (v)}
| Seq (l, r) -> compileSM(l) +++ compileSM(r)
esac
-- failure ("compileSM not implemented\n")
}
19 changes: 18 additions & 1 deletion src/Stmt.lama
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Expand Up @@ -17,7 +17,24 @@ import World;
-- Write (expr) |

fun eval (c, stmt) {
failure ("Stmt eval not implemented\n")
case stmt of
Skip -> c
| Assn (v, expr) -> [c.fst <- [v, evalExpr(c.fst, expr)], c.snd]
| Write (expr) -> case c of [st, rw] -> [st, writeWorld(evalExpr(st, expr), rw)] esac
| Read (v) ->
case c of [st, rw] ->
case readWorld(rw) of [va, nrw] ->
[st <- [v, va], nrw]
esac
esac
| Seq (l, r) ->
(
var c1;
c1 := eval (c, l);
eval (c1, r)
)
esac
-- failure ("Stmt eval not implemented\n")
}

-- Evaluates a program with a given input and returns an output
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