Merge pull request #203 from mostertb/case-alias

Add support for Aliases on CASE expressions

23 files changed, 166 insertions, 2 deletions

diff --git a/src/Components/CaseExpression.php b/src/Components/CaseExpression.php
index 19061db..ab90768 100644
--- a/src/Components/CaseExpression.php
+++ b/src/Components/CaseExpression.php
@@ -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;
@@ -56,6 +57,13 @@ class CaseExpression extends Component
     public $else_result;
 
     /**
+     * The alias of this CASE statement.
+     *
+     * @var string
+     */
+    public $alias;
+
+    /**
      * The sub-expression.
      *
      * @var string
@@ -70,8 +78,8 @@ class CaseExpression extends Component
     }
 
     /**
-     * @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
@@ -199,6 +207,64 @@ class CaseExpression extends Component
                 $list->tokens[$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);
         }
 
@@ -239,6 +305,10 @@ class CaseExpression extends Component
         }
         $ret .= 'END';
 
+        if ($component->alias) {
+            $ret .= ' AS ' . Context::escape($component->alias);
+        }
+
         return $ret;
     }
 }
diff --git a/tests/Components/CaseExpressionTest.php b/tests/Components/CaseExpressionTest.php
index afe5e60..475486f 100644
--- a/tests/Components/CaseExpressionTest.php
+++ b/tests/Components/CaseExpressionTest.php
@@ -83,4 +83,32 @@ class CaseExpressionTest extends TestCase
             '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`'
+        );
+    }
 }
diff --git a/tests/Parser/SelectStatementTest.php b/tests/Parser/SelectStatementTest.php
index 747249f..55b80ec 100644
--- a/tests/Parser/SelectStatementTest.php
+++ b/tests/Parser/SelectStatementTest.php
@@ -51,6 +51,16 @@ class SelectStatementTest extends TestCase
             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'),
diff --git a/tests/data/parser/parseSelectCaseAlias1.in b/tests/data/parser/parseSelectCaseAlias1.in
new file mode 100644
index 0000000..fe81f9d
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias1.in
@@ -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;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias1.out b/tests/data/parser/parseSelectCaseAlias1.out
new file mode 100644
index 0000000..c7c676a
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias1.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias2.in b/tests/data/parser/parseSelectCaseAlias2.in
new file mode 100644
index 0000000..1288173
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias2.in
@@ -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 /* */ foo FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias2.out b/tests/data/parser/parseSelectCaseAlias2.out
new file mode 100644
index 0000000..bffcaad
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias2.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias3.in b/tests/data/parser/parseSelectCaseAlias3.in
new file mode 100644
index 0000000..2da0fe8
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias3.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+test=case 1 /* */ when 1 then "Some" when 2 then "Other" end /* */ AS /* */ foo FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias3.out b/tests/data/parser/parseSelectCaseAlias3.out
new file mode 100644
index 0000000..8bbf030
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias3.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias4.in b/tests/data/parser/parseSelectCaseAlias4.in
new file mode 100644
index 0000000..b4d5623
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias4.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+test=case 1 /* */ when 1 then "Some" when 2 then "Other" end /* */ foo FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias4.out b/tests/data/parser/parseSelectCaseAlias4.out
new file mode 100644
index 0000000..874c8f3
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias4.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias5.in b/tests/data/parser/parseSelectCaseAlias5.in
new file mode 100644
index 0000000..ec99ffb
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias5.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case 1 when 1 then "Some" else "Other" end AS "string value" FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias5.out b/tests/data/parser/parseSelectCaseAlias5.out
new file mode 100644
index 0000000..46fb308
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias5.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias6.in b/tests/data/parser/parseSelectCaseAlias6.in
new file mode 100644
index 0000000..e964f94
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias6.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case 1 when 1 then "Some" else "Other" end AS `symbol_value` FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAlias6.out b/tests/data/parser/parseSelectCaseAlias6.out
new file mode 100644
index 0000000..5ff882f
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAlias6.out
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAliasErr1.in b/tests/data/parser/parseSelectCaseAliasErr1.in
new file mode 100644
index 0000000..b00b077
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAliasErr1.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case 1 when 1 then "Some" else "Other" end AS AS foo FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAliasErr1.out b/tests/data/parser/parseSelectCaseAliasErr1.out
new file mode 100644
index 0000000..5d66c6f
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAliasErr1.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAliasErr2.in b/tests/data/parser/parseSelectCaseAliasErr2.in
new file mode 100644
index 0000000..8611713
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAliasErr2.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case 1 when 1 then "Some" else "Other" end AS FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAliasErr2.out b/tests/data/parser/parseSelectCaseAliasErr2.out
new file mode 100644
index 0000000..ad4e57f
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAliasErr2.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAliasErr3.in b/tests/data/parser/parseSelectCaseAliasErr3.in
new file mode 100644
index 0000000..fde3e44
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAliasErr3.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case 1 when 1 then "Some" else "Other" end AS foo bar FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAliasErr3.out b/tests/data/parser/parseSelectCaseAliasErr3.out
new file mode 100644
index 0000000..827abfd
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAliasErr3.out
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diff --git a/tests/data/parser/parseSelectCaseAliasErr4.in b/tests/data/parser/parseSelectCaseAliasErr4.in
new file mode 100644
index 0000000..61c2014
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseAliasErr4.in
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseAliasErr4.out b/tests/data/parser/parseSelectCaseAliasErr4.out
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