Merge pull request #88 from devenbansod/fix_pma_12100

Add parsing of CASE Expressions

22 files changed, 408 insertions, 3 deletions

diff --git a/src/Components/CaseExpression.php b/src/Components/CaseExpression.php
new file mode 100644
index 0000000..09219ca
--- /dev/null
+++ b/src/Components/CaseExpression.php
@@ -0,0 +1,250 @@
+<?php
+
+/**
+ * Parses a reference to a CASE expression
+ *
+ * @package    SqlParser
+ * @subpackage Components
+ */
+namespace SqlParser\Components;
+
+use SqlParser\Context;
+use SqlParser\Component;
+use SqlParser\Parser;
+use SqlParser\Token;
+use SqlParser\TokensList;
+
+
+/**
+ * Parses a reference to a CASE expression
+ *
+ * @category   Components
+ * @package    SqlParser
+ * @subpackage Components
+ * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ */
+class CaseExpression extends Component
+{
+
+    /**
+     * The value to be compared
+     *
+     * @var Expression
+     */
+    public $value;
+
+    /**
+     * The conditions in WHEN clauses
+     *
+     * @var array
+     */
+    public $conditions;
+
+    /**
+     * The results matching with the WHEN clauses
+     *
+     * @var array
+     */
+    public $results;
+
+    /**
+     * The values to be compared against
+     *
+     * @var array
+     */
+    public $compare_values;
+
+    /**
+     * The result in ELSE section of expr
+     *
+     * @var array
+     */
+    public $else_result;
+
+    /**
+     * Constructor.
+     *
+     */
+    public function __construct()
+    {
+    }
+
+    /**
+     *
+     * @param Parser     $parser  The parser that serves as context.
+     * @param TokensList $list    The list of tokens that are being parsed.
+     *
+     * @return Expression
+     */
+    public static function parse(Parser $parser, TokensList $list, array $options = array())
+    {
+        $ret = new CaseExpression();
+
+        /**
+         * State of parser
+         *
+         * @var int $parser
+         */
+        $state = 0;
+
+        /**
+         * Syntax type (type 0 or type 1)
+         *
+         * @var int $type
+         */
+        $type = 0;
+
+        ++$list->idx; // Skip 'CASE'
+
+        for (; $list->idx < $list->count; ++$list->idx) {
+
+            /**
+             * Token parsed at this moment.
+             *
+             * @var Token $token
+             */
+            $token = $list->tokens[$list->idx];
+
+            // Skipping whitespaces and comments.
+            if (($token->type === Token::TYPE_WHITESPACE)
+                || ($token->type === Token::TYPE_COMMENT)
+            ) {
+                continue;
+            }
+
+            if ($state === 0) {
+                if ($token->type === Token::TYPE_KEYWORD
+                    && $token->value === 'WHEN'
+                ) {
+                    ++$list->idx; // Skip 'WHEN'
+                    $new_condition = Condition::parse($parser, $list);
+                    $type = 1;
+                    $state = 1;
+                    $ret->conditions[] = $new_condition;
+                } elseif ($token->type === Token::TYPE_KEYWORD
+                    && $token->value === 'ELSE'
+                ) {
+                    ++$list->idx; // Skip 'ELSE'
+                    $ret->else_result = Expression::parse($parser, $list);
+                    $state = 0; // last clause of CASE expression
+                } elseif ($token->type === Token::TYPE_KEYWORD
+                    && ($token->value === 'END'
+                    || $token->value === 'end')
+                ) {
+                    $state = 3; // end of CASE expression
+                    ++$list->idx;
+                    break;
+                } elseif ($token->type === Token::TYPE_KEYWORD) {
+                    $parser->error(__('Unexpected keyword.'), $token);
+                    break;
+                } else {
+                    $ret->value = Expression::parse($parser, $list);
+                    $type = 0;
+                    $state = 1;
+                }
+            } elseif ($state === 1) {
+                if ($type === 0) {
+                    if ($token->type === Token::TYPE_KEYWORD
+                        && $token->value === 'WHEN'
+                    ) {
+                        ++$list->idx; // Skip 'WHEN'
+                        $new_value = Expression::parse($parser, $list);
+                        $state = 2;
+                        $ret->compare_values[] = $new_value;
+                    } elseif ($token->type === Token::TYPE_KEYWORD
+                        && $token->value === 'ELSE'
+                    ) {
+                        ++$list->idx; // Skip 'ELSE'
+                        $ret->else_result = Expression::parse($parser, $list);
+                        $state = 0; // last clause of CASE expression
+                    } elseif ($token->type === Token::TYPE_KEYWORD
+                        && ($token->value === 'END'
+                        || $token->value === 'end')
+                    ) {
+                        $state = 3; // end of CASE expression
+                        ++$list->idx;
+                        break;
+                    } elseif ($token->type === Token::TYPE_KEYWORD) {
+                        $parser->error(__('Unexpected keyword.'), $token);
+                        break;
+                    }
+                } else {
+                    if ($token->type === Token::TYPE_KEYWORD
+                        && $token->value === 'THEN'
+                    ) {
+                        ++$list->idx; // Skip 'THEN'
+                        $new_result = Expression::parse($parser, $list);
+                        $state = 0;
+                        $ret->results[] = $new_result;
+                    } elseif ($token->type === Token::TYPE_KEYWORD) {
+                        $parser->error(__('Unexpected keyword.'), $token);
+                        break;
+                    }
+                }
+            } elseif ($state === 2) {
+                if ($type === 0) {
+                    if ($token->type === Token::TYPE_KEYWORD
+                        && $token->value === 'THEN'
+                    ) {
+                        ++$list->idx; // Skip 'THEN'
+                        $new_result = Expression::parse($parser, $list);
+                        $ret->results[] = $new_result;
+                        $state = 1;
+                    } elseif ($token->type === Token::TYPE_KEYWORD) {
+                        $parser->error(__('Unexpected keyword.'), $token);
+                        break;
+                    }
+                }
+            }
+        }
+
+        if ($state !== 3) {
+            $parser->error(
+                __('Unexpected end of CASE expression'),
+                $list->tokens[$list->idx - 1]
+            );
+        }
+
+        --$list->idx;
+        return $ret;
+    }
+
+    /**
+     * @param Expression $component The component to be built.
+     * @param array      $options   Parameters for building.
+     *
+     * @return string
+     */
+    public static function build($component, array $options = array())
+    {
+        $ret = 'CASE ';
+        if (isset($component->value)) {
+            // Syntax type 0
+            $ret .= $component->value . ' ';
+            for (
+                $i = 0;
+                $i < count($component->compare_values) && $i < count($component->results);
+                ++$i
+            ) {
+                $ret .= 'WHEN ' . $component->compare_values[$i] . ' ';
+                $ret .= 'THEN ' . $component->results[$i] . ' ';
+            }
+        } else {
+            // Syntax type 1
+            for (
+                $i = 0;
+                $i < count($component->conditions) && $i < count($component->results);
+                ++$i
+            ) {
+                $ret .= 'WHEN ' . Condition::build($component->conditions[$i]) . ' ';
+                $ret .= 'THEN ' . $component->results[$i] . ' ';
+            }
+        }
+        if (isset($component->else_result)) {
+            $ret .= 'ELSE ' . $component->else_result . ' ';
+        }
+        $ret .= 'END';
+
+        return $ret;
+    }
+}
diff --git a/src/Components/ExpressionArray.php b/src/Components/ExpressionArray.php
index 8c0e6f7..e2aa86e 100644
--- a/src/Components/ExpressionArray.php
+++ b/src/Components/ExpressionArray.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * Parses a a list of expressions delimited by a comma.
+ * Parses a list of expressions delimited by a comma.
  *
  * @package    SqlParser
  * @subpackage Components
@@ -14,7 +14,7 @@ use SqlParser\Token;
 use SqlParser\TokensList;
 
 /**
- * Parses a a list of expressions delimited by a comma.
+ * Parses a list of expressions delimited by a comma.
  *
  * @category   Keywords
  * @package    SqlParser
@@ -72,13 +72,21 @@ class ExpressionArray extends Component
                 && ((~$token->flags & Token::FLAG_KEYWORD_FUNCTION))
                 && ($token->value !== 'DUAL')
                 && ($token->value !== 'NULL')
+                && ($token->value !== 'CASE')
             ) {
                 // No keyword is expected.
                 break;
             }
 
             if ($state === 0) {
-                $expr = Expression::parse($parser, $list, $options);
+                if ($token->type === Token::TYPE_KEYWORD
+                    && $token->value === 'CASE'
+                ) {
+                    $expr = CaseExpression::parse($parser, $list, $options);
+                } else {
+                    $expr = Expression::parse($parser, $list, $options);
+                }
+
                 if ($expr === null) {
                     break;
                 }
diff --git a/tests/Components/CaseExpressionTest.php b/tests/Components/CaseExpressionTest.php
new file mode 100644
index 0000000..8746909
--- /dev/null
+++ b/tests/Components/CaseExpressionTest.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace SqlParser\Tests\Components;
+
+use SqlParser\Parser;
+use SqlParser\Components\CaseExpression;
+
+use SqlParser\Tests\TestCase;
+
+class CaseExpressionTest extends TestCase
+{
+
+    public function testParseBuild()
+    {
+        $caseExprQuery = 'case 1 when 1 then "Some" else "Other" end';
+        $component = CaseExpression::parse(
+            new Parser(),
+            $this->getTokensList($caseExprQuery));
+        $this->assertEquals(
+            CaseExpression::build($component),
+            'CASE 1 WHEN 1 THEN "Some" ELSE "Other" END'
+        );
+    }
+
+    public function testParseBuild2()
+    {
+        $caseExprQuery = 'case when 1=1 then "India" else "Other" end';
+        $component = CaseExpression::parse(
+            new Parser(),
+            $this->getTokensList($caseExprQuery));
+        $this->assertEquals(
+            CaseExpression::build($component),
+            'CASE WHEN 1=1 THEN "India" ELSE "Other" END'
+        );
+    }
+
+    public function testParseBuild3()
+    {
+        $caseExprQuery = 'case 1 when 1 then "Some" '
+            . 'when 2 then "SomeOther" else "Other" end';
+        $component = CaseExpression::parse(
+            new Parser(),
+            $this->getTokensList($caseExprQuery));
+        $this->assertEquals(
+            CaseExpression::build($component),
+            'CASE 1 WHEN 1 THEN "Some" WHEN 2 THEN "SomeOther" ELSE "Other" END'
+        );
+    }
+
+    public function testParseBuild4()
+    {
+        $caseExprQuery = 'case 1 when 1 then "Some" '
+            . 'when 2 then "SomeOther" end';
+        $component = CaseExpression::parse(
+            new Parser(),
+            $this->getTokensList($caseExprQuery));
+        $this->assertEquals(
+            CaseExpression::build($component),
+            'CASE 1 WHEN 1 THEN "Some" WHEN 2 THEN "SomeOther" END'
+        );
+    }
+
+    public function testParseBuild5()
+    {
+        $caseExprQuery = 'case when 1=1 then "Some" '
+            . 'when 1=2 then "SomeOther" else "Other" end';
+        $component = CaseExpression::parse(
+            new Parser(),
+            $this->getTokensList($caseExprQuery));
+        $this->assertEquals(
+            CaseExpression::build($component),
+            'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" ELSE "Other" END'
+        );
+    }
+
+    public function testParseBuild6()
+    {
+        $caseExprQuery = 'case when 1=1 then "Some" '
+            . 'when 1=2 then "SomeOther" end';
+        $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'
+        );
+    }
+}
diff --git a/tests/Parser/SelectStatementTest.php b/tests/Parser/SelectStatementTest.php
index 5bf5c65..0ab7c5f 100644
--- a/tests/Parser/SelectStatementTest.php
+++ b/tests/Parser/SelectStatementTest.php
@@ -33,6 +33,15 @@ class SelectStatementTest extends TestCase
             array('parser/parseSelect4'),
             array('parser/parseSelectErr1'),
             array('parser/parseSelectNested'),
+            array('parser/parseSelectCase1'),
+            array('parser/parseSelectCase2'),
+            array('parser/parseSelectCase3'),
+            array('parser/parseSelectCase4'),
+            array('parser/parseSelectCaseErr1'),
+            array('parser/parseSelectCaseErr2'),
+            array('parser/parseSelectCaseErr3'),
+            array('parser/parseSelectCaseErr4'),
+            array('parser/parseSelectCaseErr5'),
         );
     }
 }
diff --git a/tests/data/parser/parseSelectCase1.in b/tests/data/parser/parseSelectCase1.in
new file mode 100644
index 0000000..8a9fbf8
--- /dev/null
+++ b/tests/data/parser/parseSelectCase1.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 FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCase1.out b/tests/data/parser/parseSelectCase1.out
new file mode 100644
index 0000000..f5da642
--- /dev/null
+++ b/tests/data/parser/parseSelectCase1.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCase2.in b/tests/data/parser/parseSelectCase2.in
new file mode 100644
index 0000000..39af441
--- /dev/null
+++ b/tests/data/parser/parseSelectCase2.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" else "Other" end FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCase2.out b/tests/data/parser/parseSelectCase2.out
new file mode 100644
index 0000000..1619dff
--- /dev/null
+++ b/tests/data/parser/parseSelectCase2.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCase3.in b/tests/data/parser/parseSelectCase3.in
new file mode 100644
index 0000000..6e2c04b
--- /dev/null
+++ b/tests/data/parser/parseSelectCase3.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 FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCase3.out b/tests/data/parser/parseSelectCase3.out
new file mode 100644
index 0000000..7269180
--- /dev/null
+++ b/tests/data/parser/parseSelectCase3.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCase4.in b/tests/data/parser/parseSelectCase4.in
new file mode 100644
index 0000000..26fab19
--- /dev/null
+++ b/tests/data/parser/parseSelectCase4.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" when 2 then "Other" end FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCase4.out b/tests/data/parser/parseSelectCase4.out
new file mode 100644
index 0000000..8a45ca2
--- /dev/null
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr1.in b/tests/data/parser/parseSelectCaseErr1.in
new file mode 100644
index 0000000..d0fbf10
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr1.in
@@ -0,0 +1 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name, case 1 then 1 then "Some" else "Other" end FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr1.out b/tests/data/parser/parseSelectCaseErr1.out
new file mode 100644
index 0000000..f889f0e
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr1.out
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr2.in b/tests/data/parser/parseSelectCaseErr2.in
new file mode 100644
index 0000000..90b7b9a
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr2.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case then 1=1 then "Some" else "Other" end FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr2.out b/tests/data/parser/parseSelectCaseErr2.out
new file mode 100644
index 0000000..f39a2a3
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr2.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr3.in b/tests/data/parser/parseSelectCaseErr3.in
new file mode 100644
index 0000000..9461c0e
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr3.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case when 1=1 when "Some" else "Other" end FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr3.out b/tests/data/parser/parseSelectCaseErr3.out
new file mode 100644
index 0000000..80aa11d
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr3.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr4.in b/tests/data/parser/parseSelectCaseErr4.in
new file mode 100644
index 0000000..e2fa19f
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr4.in
@@ -0,0 +1,2 @@
+select (SELECT name FROM mysql.help_category WHERE help_category_id = 1) as name,
+case 1 then 1 when "Some" else "Other" end FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr4.out b/tests/data/parser/parseSelectCaseErr4.out
new file mode 100644
index 0000000..bf75e57
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr4.out
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr5.in b/tests/data/parser/parseSelectCaseErr5.in
new file mode 100644
index 0000000..6487375
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr5.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" when 2 when "Other" end FROM a;
\ No newline at end of file
diff --git a/tests/data/parser/parseSelectCaseErr5.out b/tests/data/parser/parseSelectCaseErr5.out
new file mode 100644
index 0000000..1cdbcbe
--- /dev/null
+++ b/tests/data/parser/parseSelectCaseErr5.out
@@ -0,0 +1,4 @@
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