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ibennetchibennetch
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Merge pull request #203 from mostertb/case-alias
Add support for Aliases on CASE expressions
2 parents e497100 + bf4ad3d commit c8febda

23 files changed

+166
-2
lines changed

‎src/Components/CaseExpression.php

Lines changed: 72 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,6 +7,7 @@
77
namespace PhpMyAdmin\SqlParser\Components;
88

99
use PhpMyAdmin\SqlParser\Component;
10+
use PhpMyAdmin\SqlParser\Context;
1011
use PhpMyAdmin\SqlParser\Parser;
1112
use PhpMyAdmin\SqlParser\Token;
1213
use PhpMyAdmin\SqlParser\TokensList;
@@ -55,6 +56,13 @@ class CaseExpression extends Component
5556
*/
5657
public $else_result;
5758

59+
/**
60+
* The alias of this CASE statement.
61+
*
62+
* @var string
63+
*/
64+
public $alias;
65+
5866
/**
5967
* The sub-expression.
6068
*
@@ -70,8 +78,8 @@ public function __construct()
7078
}
7179

7280
/**
73-
* @param Parser $parser the parser that serves as context
74-
* @param TokensList $list the list of tokens that are being parsed
81+
* @param Parser $parser the parser that serves as context
82+
* @param TokensList $list the list of tokens that are being parsed
7583
* @param array $options parameters for parsing
7684
*
7785
* @return CaseExpression
@@ -199,6 +207,64 @@ public static function parse(Parser $parser, TokensList $list, array $options =
199207
$list->tokens[$list->idx - 1]
200208
);
201209
} else {
210+
// Parse for alias of CASE expression
211+
$asFound = false;
212+
for (; $list->idx < $list->count; ++$list->idx) {
213+
$token = $list->tokens[$list->idx];
214+
215+
// End of statement.
216+
if ($token->type === Token::TYPE_DELIMITER) {
217+
break;
218+
}
219+
220+
// Skipping whitespaces and comments.
221+
if (($token->type === Token::TYPE_WHITESPACE)
222+
|| ($token->type === Token::TYPE_COMMENT)
223+
) {
224+
continue;
225+
}
226+
227+
// Handle optional AS keyword before alias
228+
if ($token->type === Token::TYPE_KEYWORD
229+
&& $token->keyword === 'AS') {
230+
if ($asFound || !empty($ret->alias)) {
231+
$parser->error('Potential duplicate alias of CASE expression.', $token);
232+
break;
233+
}
234+
$asFound = true;
235+
continue;
236+
}
237+
238+
if ($asFound
239+
&& $token->type === Token::TYPE_KEYWORD
240+
&& ($token->flags & Token::FLAG_KEYWORD_RESERVED || $token->flags & Token::FLAG_KEYWORD_FUNCTION)) {
241+
$parser->error('An alias expected after AS but got ' . $token->value, $token);
242+
$asFound = false;
243+
break;
244+
}
245+
246+
if ($asFound
247+
|| $token->type === Token::TYPE_STRING
248+
|| ($token->type === Token::TYPE_SYMBOL && !$token->flags & Token::FLAG_SYMBOL_VARIABLE)
249+
|| $token->type === Token::TYPE_NONE
250+
) {
251+
// An alias is expected (the keyword `AS` was previously found).
252+
if (!empty($ret->alias)) {
253+
$parser->error('An alias was previously found.', $token);
254+
break;
255+
}
256+
$ret->alias = $token->value;
257+
$asFound = false;
258+
259+
continue;
260+
}
261+
262+
break;
263+
}
264+
if ($asFound) {
265+
$parser->error('An alias was expected after AS.', $list->tokens[$list->idx - 1]);
266+
}
267+
202268
$ret->expr = self::build($ret);
203269
}
204270

@@ -239,6 +305,10 @@ public static function build($component, array $options = array())
239305
}
240306
$ret .= 'END';
241307

308+
if ($component->alias) {
309+
$ret .= ' AS ' . Context::escape($component->alias);
310+
}
311+
242312
return $ret;
243313
}
244314
}

‎tests/Components/CaseExpressionTest.php

Lines changed: 28 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -83,4 +83,32 @@ public function testParseBuild6()
8383
'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" END'
8484
);
8585
}
86+
87+
public function testParseBuild7()
88+
{
89+
$caseExprQuery = 'case when 1=1 then "Some" '
90+
. 'when 1=2 then "SomeOther" end AS foo';
91+
$component = CaseExpression::parse(
92+
new Parser(),
93+
$this->getTokensList($caseExprQuery)
94+
);
95+
$this->assertEquals(
96+
CaseExpression::build($component),
97+
'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" END AS `foo`'
98+
);
99+
}
100+
101+
public function testParseBuild8()
102+
{
103+
$caseExprQuery = 'case when 1=1 then "Some" '
104+
. 'when 1=2 then "SomeOther" end foo';
105+
$component = CaseExpression::parse(
106+
new Parser(),
107+
$this->getTokensList($caseExprQuery)
108+
);
109+
$this->assertEquals(
110+
CaseExpression::build($component),
111+
'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" END AS `foo`'
112+
);
113+
}
86114
}

‎tests/Parser/SelectStatementTest.php

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -51,6 +51,16 @@ public function testSelectProvider()
5151
array('parser/parseSelectCaseErr3'),
5252
array('parser/parseSelectCaseErr4'),
5353
array('parser/parseSelectCaseErr5'),
54+
array('parser/parseSelectCaseAlias1'),
55+
array('parser/parseSelectCaseAlias2'),
56+
array('parser/parseSelectCaseAlias3'),
57+
array('parser/parseSelectCaseAlias4'),
58+
array('parser/parseSelectCaseAlias5'),
59+
array('parser/parseSelectCaseAlias6'),
60+
array('parser/parseSelectCaseAliasErr1'),
61+
array('parser/parseSelectCaseAliasErr2'),
62+
array('parser/parseSelectCaseAliasErr3'),
63+
array('parser/parseSelectCaseAliasErr4'),
5464
array('parser/parseSelectIntoOptions1'),
5565
array('parser/parseSelectIntoOptions2'),
5666
array('parser/parseSelectIntoOptions3'),

‎tests/data/parser/parseSelectCaseAlias1.in

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,2 @@
1+
select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
2+
case /* */ when 1=1 then "Some" when 2=1 then "Other" end /* */ AS /* */ foo FROM a;

‎tests/data/parser/parseSelectCaseAlias1.out

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,4 @@
1+
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2+
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3+
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4+
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‎tests/data/parser/parseSelectCaseAlias2.in

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select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
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case /* */ when 1=1 then "Some" when 2=1 then "Other" end /* */ foo FROM a;

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