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Code Issues Releases Wiki Activity

Add a linter rule to detect duplicate case statements

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Summary: Fixes T6843. Adds a linter rule to `ArcanistXHPASTLinter` to detect duplicate `case` statements within a `switch` statement.

Test Plan: Added test cases.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T6843

Differential Revision: https://secure.phabricator.com/D11171
This commit is contained in:
Joshua Spence 2015-01-04 16:49:57 +11:00
parent 4e3df80584
commit b31e9c0cfe
2 changed files with 70 additions and 1 deletions
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43
src/lint/linter/ArcanistXHPASTLinter.php
View file

@ -49,6 +49,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
const LINT_EMPTY_STATEMENT = 47;
const LINT_ARRAY_SEPARATOR = 48;
const LINT_CONSTRUCTOR_PARENTHESES = 49;
const LINT_DUPLICATE_SWITCH_CASE = 50;
private $naminghook;
private $switchhook;
@ -109,6 +110,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
self::LINT_EMPTY_STATEMENT => 'Empty Block Statement',
self::LINT_ARRAY_SEPARATOR => 'Array Separator',
self::LINT_CONSTRUCTOR_PARENTHESES => 'Constructor Parentheses',
self::LINT_DUPLICATE_SWITCH_CASE => 'Duplicate Case Statements',
);
}
@ -199,7 +201,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
public function getVersion() {
// The version number should be incremented whenever a new rule is added.
return '10';
return '11';
}
protected function resolveFuture($path, Future $future) {
@ -271,6 +273,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
'lintEmptyBlockStatements' => self::LINT_EMPTY_STATEMENT,
'lintArraySeparator' => self::LINT_ARRAY_SEPARATOR,
'lintConstructorParentheses' => self::LINT_CONSTRUCTOR_PARENTHESES,
'lintSwitchStatements' => self::LINT_DUPLICATE_SWITCH_CASE,
);
foreach ($method_codes as $method => $codes) {
@ -2868,6 +2871,44 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
}
}
private function lintSwitchStatements(XHPASTNode $root) {
$switch_statements = $root->selectDescendantsOfType('n_SWITCH');
foreach ($switch_statements as $switch_statement) {
$case_statements = $switch_statement
->getChildOfType(1, 'n_STATEMENT_LIST')
->getChildrenOfType('n_CASE');
$nodes_by_case = array();
foreach ($case_statements as $case_statement) {
$case = $case_statement
->getChildByIndex(0)
->getSemanticString();
$nodes_by_case[$case][] = $case_statement;
}
foreach ($nodes_by_case as $case => $nodes) {
if (count($nodes) <= 1) {
continue;
}
$node = array_pop($nodes_by_case[$case]);
$message = $this->raiseLintAtNode(
$node,
self::LINT_DUPLICATE_SWITCH_CASE,
pht(
'Duplicate case in switch statement. PHP will ignore all '.
'but the first case.'));
$locations = array();
foreach ($nodes_by_case[$case] as $node) {
$locations[] = $this->getOtherLocation($node->getOffset());
}
$message->setOtherLocations($locations);
}
}
}
public function getSuperGlobalNames() {
return array(
'$GLOBALS',

28
src/lint/linter/__tests__/xhpast/duplicate-switch-case.lint-test Normal file
View file

@ -0,0 +1,28 @@
<?php
$x = null;
$y = null;
switch ($x) {}
switch ($x) {
case 1: break;
case '1': break;
case true: break;
case null: break;
default: break;
}
switch ($x) {
case 'foo': break;
case 'bar': break;
case 'foo': break;
default:
switch ($y) {
case 'foo': break;
case 'bar': break;
case 'baz': break;
case 'baz': break;
}
break;
}
~~~~~~~~~~
error:15:3
error:22:7