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Add support for Aliases on CASE expressions #203

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Merged
ibennetch merged 7 commits into from
Dec 24, 2018
Merged

Add support for Aliases on CASE expressions #203

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1a18d1c
Add Support for CASE ... END AS alias
mostertb Oct 13, 2018
f2127a1
Handle CASE alias without AS
mostertb Oct 13, 2018
f72a44c
Explicitly handle case where keyword encountered before alias value f…
mostertb Oct 13, 2018
9cc6cc7
Handle end of statement while parsing CASE alias
mostertb Oct 13, 2018
6f76011
Add tests for parsing of CASE expressions with aliases
mostertb Oct 13, 2018
61343f6
Add component build tests from CASE expressions with aliases
mostertb Oct 13, 2018
bf4ad3d
Apply php-cs-fixer formatting changes
mostertb Oct 13, 2018
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74 changes: 72 additions & 2 deletions src/Components/CaseExpression.php
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
namespace PhpMyAdmin\SqlParser\Components;

use PhpMyAdmin\SqlParser\Component;
use PhpMyAdmin\SqlParser\Context;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
Expand Down Expand Up @@ -55,6 +56,13 @@ class CaseExpression extends Component
*/
public $else_result;

/**
* The alias of this CASE statement.
*
* @var string
*/
public $alias;

/**
* The sub-expression.
*
Expand All @@ -70,8 +78,8 @@ public function __construct()
}

/**
* @param Parser $parser the parser that serves as context
* @param TokensList $list the list of tokens that are being parsed
* @param Parser $parser the parser that serves as context
* @param TokensList $list the list of tokens that are being parsed
* @param array $options parameters for parsing
*
* @return CaseExpression
Expand Down Expand Up @@ -201,6 +209,64 @@ public static function parse(Parser $parser, TokensList $list, array $options =
$list->tokens[$list->idx - 1]
);
} else {
// Parse for alias of CASE expression
$asFound = false;
for (; $list->idx < $list->count; ++$list->idx) {
$token = $list->tokens[$list->idx];

// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}

// Skipping whitespaces and comments.
if (($token->type === Token::TYPE_WHITESPACE)
|| ($token->type === Token::TYPE_COMMENT)
) {
continue;
}

// Handle optional AS keyword before alias
if ($token->type === Token::TYPE_KEYWORD
&& $token->keyword === 'AS') {
if ($asFound || !empty($ret->alias)) {
$parser->error('Potential duplicate alias of CASE expression.', $token);
break;
}
$asFound = true;
continue;
}

if ($asFound
&& $token->type === Token::TYPE_KEYWORD
&& ($token->flags & Token::FLAG_KEYWORD_RESERVED || $token->flags & Token::FLAG_KEYWORD_FUNCTION)) {
$parser->error('An alias expected after AS but got ' . $token->value, $token);
$asFound = false;
break;
}

if ($asFound
|| $token->type === Token::TYPE_STRING
|| ($token->type === Token::TYPE_SYMBOL && !$token->flags & Token::FLAG_SYMBOL_VARIABLE)
|| $token->type === Token::TYPE_NONE
) {
// An alias is expected (the keyword `AS` was previously found).
if (!empty($ret->alias)) {
$parser->error('An alias was previously found.', $token);
break;
}
$ret->alias = $token->value;
$asFound = false;

continue;
}

break;
}
if ($asFound) {
$parser->error('An alias was expected after AS.', $list->tokens[$list->idx - 1]);
}

$ret->expr = self::build($ret);
}

Expand Down Expand Up @@ -241,6 +307,10 @@ public static function build($component, array $options = array())
}
$ret .= 'END';

if ($component->alias) {
$ret .= ' AS ' . Context::escape($component->alias);
}

return $ret;
}
}
28 changes: 28 additions & 0 deletions tests/Components/CaseExpressionTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -83,4 +83,32 @@ public function testParseBuild6()
'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" END'
);
}

public function testParseBuild7()
{
$caseExprQuery = 'case when 1=1 then "Some" '
. 'when 1=2 then "SomeOther" end AS foo';
$component = CaseExpression::parse(
new Parser(),
$this->getTokensList($caseExprQuery)
);
$this->assertEquals(
CaseExpression::build($component),
'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" END AS `foo`'
);
}

public function testParseBuild8()
{
$caseExprQuery = 'case when 1=1 then "Some" '
. 'when 1=2 then "SomeOther" end foo';
$component = CaseExpression::parse(
new Parser(),
$this->getTokensList($caseExprQuery)
);
$this->assertEquals(
CaseExpression::build($component),
'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" END AS `foo`'
);
}
}
10 changes: 10 additions & 0 deletions tests/Parser/SelectStatementTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,16 @@ public function testSelectProvider()
array('parser/parseSelectCaseErr3'),
array('parser/parseSelectCaseErr4'),
array('parser/parseSelectCaseErr5'),
array('parser/parseSelectCaseAlias1'),
array('parser/parseSelectCaseAlias2'),
array('parser/parseSelectCaseAlias3'),
array('parser/parseSelectCaseAlias4'),
array('parser/parseSelectCaseAlias5'),
array('parser/parseSelectCaseAlias6'),
array('parser/parseSelectCaseAliasErr1'),
array('parser/parseSelectCaseAliasErr2'),
array('parser/parseSelectCaseAliasErr3'),
array('parser/parseSelectCaseAliasErr4'),
array('parser/parseSelectIntoOptions1'),
array('parser/parseSelectIntoOptions2'),
array('parser/parseSelectIntoOptions3'),
Expand Down
2 changes: 2 additions & 0 deletions tests/data/parser/parseSelectCaseAlias1.in
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
case /* */ when 1=1 then "Some" when 2=1 then "Other" end /* */ AS /* */ foo FROM a;
4 changes: 4 additions & 0 deletions tests/data/parser/parseSelectCaseAlias1.out
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@@ -0,0 +1,4 @@
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2 changes: 2 additions & 0 deletions tests/data/parser/parseSelectCaseAlias2.in
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select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
case /* */ when 1=1 then "Some" when 2=1 then "Other" end /* */ foo FROM a;
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