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Optimization: read ast length to variable in eval

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This commit is contained in:
Pekka Laiho 2020-12-03 10:18:22 +07:00
parent a86fd77b45
commit 3c9885c7f9
1 changed files with 28 additions and 24 deletions
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52
src/Evaller.php
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@ -35,10 +35,14 @@ class Evaller
} }
} }
// Not list or empty list // Not list
if (!($ast instanceof MList)) { if (!($ast instanceof MList)) {
return $this->evalAst($ast, $env); return $this->evalAst($ast, $env);
} elseif ($ast->count() == 0) { }
// Empty list
$astLength = $ast->count();
if ($astLength == 0) {
return $ast; return $ast;
} }
@ -47,25 +51,25 @@ class Evaller
$symbolName = $ast->get(0)->getName(); $symbolName = $ast->get(0)->getName();
if ($symbolName == 'and') { if ($symbolName == 'and') {
if ($ast->count() == 1) { if ($astLength == 1) {
return true; return true;
} }
for ($i = 1; $i < $ast->count() - 1; $i++) { for ($i = 1; $i < $astLength - 1; $i++) {
$value = $this->eval($ast->get($i), $env); $value = $this->eval($ast->get($i), $env);
if ($value == false) { if ($value == false) {
return $value; return $value;
} }
} }
$ast = $ast->get($ast->count() - 1); $ast = $ast->get($astLength - 1);
continue; // tco continue; // tco
} elseif ($symbolName == 'case') { } elseif ($symbolName == 'case') {
if ($ast->count() < 2) { if ($astLength < 2) {
throw new MadLispException("case requires at least 1 argument"); throw new MadLispException("case requires at least 1 argument");
} }
for ($i = 1; $i < $ast->count() - 1; $i += 2) { for ($i = 1; $i < $astLength - 1; $i += 2) {
$test = $this->eval($ast->get($i), $env); $test = $this->eval($ast->get($i), $env);
if ($test == true) { if ($test == true) {
$ast = $ast->get($i + 1); $ast = $ast->get($i + 1);
@ -74,14 +78,14 @@ class Evaller
} }
// Last value, no test // Last value, no test
if ($ast->count() % 2 == 0) { if ($astLength % 2 == 0) {
$ast = $ast->get($ast->count() - 1); $ast = $ast->get($astLength - 1);
continue; // tco continue; // tco
} else { } else {
return null; return null;
} }
} elseif ($symbolName == 'def') { } elseif ($symbolName == 'def') {
if ($ast->count() != 3) { if ($astLength != 3) {
throw new MadLispException("def requires exactly 2 arguments"); throw new MadLispException("def requires exactly 2 arguments");
} }
@ -100,18 +104,18 @@ class Evaller
$value = $this->eval($ast->get(2), $env); $value = $this->eval($ast->get(2), $env);
return $env->set($name, $value); return $env->set($name, $value);
} elseif ($symbolName == 'do') { } elseif ($symbolName == 'do') {
if ($ast->count() == 1) { if ($astLength == 1) {
return null; return null;
} }
for ($i = 1; $i < $ast->count() - 1; $i++) { for ($i = 1; $i < $astLength - 1; $i++) {
$this->eval($ast->get($i), $env); $this->eval($ast->get($i), $env);
} }
$ast = $ast->get($ast->count() - 1); $ast = $ast->get($astLength - 1);
continue; // tco continue; // tco
} elseif ($symbolName == 'env') { } elseif ($symbolName == 'env') {
if ($ast->count() >= 2) { if ($astLength >= 2) {
if (!($ast->get(1) instanceof Symbol)) { if (!($ast->get(1) instanceof Symbol)) {
throw new MadLispException("first argument to env is not symbol"); throw new MadLispException("first argument to env is not symbol");
} }
@ -121,14 +125,14 @@ class Evaller
return $env; return $env;
} }
} elseif ($symbolName == 'eval') { } elseif ($symbolName == 'eval') {
if ($ast->count() == 1) { if ($astLength == 1) {
return null; return null;
} }
$ast = $this->eval($ast->get(1), $env); $ast = $this->eval($ast->get(1), $env);
continue; // tco continue; // tco
} elseif ($symbolName == 'fn') { } elseif ($symbolName == 'fn') {
if ($ast->count() != 3) { if ($astLength != 3) {
throw new MadLispException("fn requires exactly 2 arguments"); throw new MadLispException("fn requires exactly 2 arguments");
} }
@ -155,7 +159,7 @@ class Evaller
return new UserFunc($closure, $ast->get(2), $env, $bindings); return new UserFunc($closure, $ast->get(2), $env, $bindings);
} elseif ($symbolName == 'if') { } elseif ($symbolName == 'if') {
if ($ast->count() < 3 || $ast->count() > 4) { if ($astLength < 3 || $astLength > 4) {
throw new MadLispException("if requires 2 or 3 arguments"); throw new MadLispException("if requires 2 or 3 arguments");
} }
@ -164,14 +168,14 @@ class Evaller
if ($result == true) { if ($result == true) {
$ast = $ast->get(2); $ast = $ast->get(2);
continue; continue;
} elseif ($ast->count() == 4) { } elseif ($astLength == 4) {
$ast = $ast->get(3); $ast = $ast->get(3);
continue; continue;
} else { } else {
return null; return null;
} }
} elseif ($symbolName == 'let') { } elseif ($symbolName == 'let') {
if ($ast->count() != 3) { if ($astLength != 3) {
throw new MadLispException("let requires exactly 2 arguments"); throw new MadLispException("let requires exactly 2 arguments");
} }
@ -205,7 +209,7 @@ class Evaller
// Load is here because we want to load into // Load is here because we want to load into
// current $env which is hard otherwise. // current $env which is hard otherwise.
if ($ast->count() != 2) { if ($astLength != 2) {
throw new MadLispException("load requires exactly 1 argument"); throw new MadLispException("load requires exactly 1 argument");
} }
@ -247,21 +251,21 @@ class Evaller
continue; // tco continue; // tco
} elseif ($symbolName == 'or') { } elseif ($symbolName == 'or') {
if ($ast->count() == 1) { if ($astLength == 1) {
return false; return false;
} }
for ($i = 1; $i < $ast->count() - 1; $i++) { for ($i = 1; $i < $astLength - 1; $i++) {
$value = $this->eval($ast->get($i), $env); $value = $this->eval($ast->get($i), $env);
if ($value == true) { if ($value == true) {
return $value; return $value;
} }
} }
$ast = $ast->get($ast->count() - 1); $ast = $ast->get($astLength - 1);
continue; // tco continue; // tco
} elseif ($symbolName == 'quote') { } elseif ($symbolName == 'quote') {
if ($ast->count() != 2) { if ($astLength != 2) {
throw new MadLispException("quote requires exactly 1 argument"); throw new MadLispException("quote requires exactly 1 argument");
} }