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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)) {
return $this->evalAst($ast, $env);
} elseif ($ast->count() == 0) {
}
// Empty list
$astLength = $ast->count();
if ($astLength == 0) {
return $ast;
}
@ -47,25 +51,25 @@ class Evaller
$symbolName = $ast->get(0)->getName();
if ($symbolName == 'and') {
if ($ast->count() == 1) {
if ($astLength == 1) {
return true;
}
for ($i = 1; $i < $ast->count() - 1; $i++) {
for ($i = 1; $i < $astLength - 1; $i++) {
$value = $this->eval($ast->get($i), $env);
if ($value == false) {
return $value;
}
}
$ast = $ast->get($ast->count() - 1);
$ast = $ast->get($astLength - 1);
continue; // tco
} elseif ($symbolName == 'case') {
if ($ast->count() < 2) {
if ($astLength < 2) {
throw new MadLispException("case requires at least 1 argument");
}
for ($i = 1; $i < $ast->count() - 1; $i += 2) {
for ($i = 1; $i < $astLength - 1; $i += 2) {
$test = $this->eval($ast->get($i), $env);
if ($test == true) {
$ast = $ast->get($i + 1);
@ -74,14 +78,14 @@ class Evaller
}
// Last value, no test
if ($ast->count() % 2 == 0) {
$ast = $ast->get($ast->count() - 1);
if ($astLength % 2 == 0) {
$ast = $ast->get($astLength - 1);
continue; // tco
} else {
return null;
}
} elseif ($symbolName == 'def') {
if ($ast->count() != 3) {
if ($astLength != 3) {
throw new MadLispException("def requires exactly 2 arguments");
}
@ -100,18 +104,18 @@ class Evaller
$value = $this->eval($ast->get(2), $env);
return $env->set($name, $value);
} elseif ($symbolName == 'do') {
if ($ast->count() == 1) {
if ($astLength == 1) {
return null;
}
for ($i = 1; $i < $ast->count() - 1; $i++) {
for ($i = 1; $i < $astLength - 1; $i++) {
$this->eval($ast->get($i), $env);
}
$ast = $ast->get($ast->count() - 1);
$ast = $ast->get($astLength - 1);
continue; // tco
} elseif ($symbolName == 'env') {
if ($ast->count() >= 2) {
if ($astLength >= 2) {
if (!($ast->get(1) instanceof Symbol)) {
throw new MadLispException("first argument to env is not symbol");
}
@ -121,14 +125,14 @@ class Evaller
return $env;
}
} elseif ($symbolName == 'eval') {
if ($ast->count() == 1) {
if ($astLength == 1) {
return null;
}
$ast = $this->eval($ast->get(1), $env);
continue; // tco
} elseif ($symbolName == 'fn') {
if ($ast->count() != 3) {
if ($astLength != 3) {
throw new MadLispException("fn requires exactly 2 arguments");
}
@ -155,7 +159,7 @@ class Evaller
return new UserFunc($closure, $ast->get(2), $env, $bindings);
} elseif ($symbolName == 'if') {
if ($ast->count() < 3 || $ast->count() > 4) {
if ($astLength < 3 || $astLength > 4) {
throw new MadLispException("if requires 2 or 3 arguments");
}
@ -164,14 +168,14 @@ class Evaller
if ($result == true) {
$ast = $ast->get(2);
continue;
} elseif ($ast->count() == 4) {
} elseif ($astLength == 4) {
$ast = $ast->get(3);
continue;
} else {
return null;
}
} elseif ($symbolName == 'let') {
if ($ast->count() != 3) {
if ($astLength != 3) {
throw new MadLispException("let requires exactly 2 arguments");
}
@ -205,7 +209,7 @@ class Evaller
// Load is here because we want to load into
// current $env which is hard otherwise.
if ($ast->count() != 2) {
if ($astLength != 2) {
throw new MadLispException("load requires exactly 1 argument");
}
@ -247,21 +251,21 @@ class Evaller
continue; // tco
} elseif ($symbolName == 'or') {
if ($ast->count() == 1) {
if ($astLength == 1) {
return false;
}
for ($i = 1; $i < $ast->count() - 1; $i++) {
for ($i = 1; $i < $astLength - 1; $i++) {
$value = $this->eval($ast->get($i), $env);
if ($value == true) {
return $value;
}
}
$ast = $ast->get($ast->count() - 1);
$ast = $ast->get($astLength - 1);
continue; // tco
} elseif ($symbolName == 'quote') {
if ($ast->count() != 2) {
if ($astLength != 2) {
throw new MadLispException("quote requires exactly 1 argument");
}