1<?php
2/**
3 * FunctionBuilder.php
4 *
5 * Builds function statements.
6 *
7 * PHP version 5
8 *
9 * LICENSE:
10 * Copyright (c) 2010-2015 Justin Swanhart and André Rothe
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote products
22 *    derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * @author    André Rothe <andre.rothe@phosco.info>
36 * @copyright 2010-2015 Justin Swanhart and André Rothe
37 * @license   http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
38 * @version   SVN: $Id$
39 *
40 */
41
42namespace PHPSQLParser\builders;
43use PHPSQLParser\exceptions\UnableToCreateSQLException;
44use PHPSQLParser\utils\ExpressionType;
45
46/**
47 * This class implements the builder for function calls.
48 * You can overwrite all functions to achieve another handling.
49 *
50 * @author  André Rothe <andre.rothe@phosco.info>
51 * @license http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
52 *
53 */
54class FunctionBuilder implements Builder {
55
56    protected function buildAlias($parsed) {
57        $builder = new AliasBuilder();
58        return $builder->build($parsed);
59    }
60
61    protected function buildColRef($parsed) {
62        $builder = new ColumnReferenceBuilder();
63        return $builder->build($parsed);
64    }
65
66    protected function buildConstant($parsed) {
67        $builder = new ConstantBuilder();
68        return $builder->build($parsed);
69    }
70
71    protected function buildReserved($parsed) {
72        $builder = new ReservedBuilder();
73        return $builder->build($parsed);
74    }
75
76    protected function isReserved($parsed) {
77        $builder = new ReservedBuilder();
78        return $builder->isReserved($parsed);
79    }
80
81    protected function buildSelectExpression($parsed) {
82        $builder = new SelectExpressionBuilder();
83        return $builder->build($parsed);
84    }
85
86    protected function buildSelectBracketExpression($parsed) {
87        $builder = new SelectBracketExpressionBuilder();
88        return $builder->build($parsed);
89    }
90
91    protected function buildSubQuery($parsed) {
92        $builder = new SubQueryBuilder();
93        return $builder->build($parsed);
94    }
95
96    public function build(array $parsed) {
97        if (($parsed['expr_type'] !== ExpressionType::AGGREGATE_FUNCTION)
98            && ($parsed['expr_type'] !== ExpressionType::SIMPLE_FUNCTION)
99            && ($parsed['expr_type'] !== ExpressionType::CUSTOM_FUNCTION)) {
100            return "";
101        }
102
103        if ($parsed['sub_tree'] === false) {
104            return $parsed['base_expr'] . "()" . $this->buildAlias($parsed);
105        }
106
107        $sql = "";
108        foreach ($parsed['sub_tree'] as $k => $v) {
109            $len = strlen($sql);
110            $sql .= $this->build($v);
111            $sql .= $this->buildConstant($v);
112            $sql .= $this->buildSubQuery($v);
113            $sql .= $this->buildColRef($v);
114            $sql .= $this->buildReserved($v);
115            $sql .= $this->buildSelectBracketExpression($v);
116            $sql .= $this->buildSelectExpression($v);
117
118            if ($len == strlen($sql)) {
119                throw new UnableToCreateSQLException('function subtree', $k, $v, 'expr_type');
120            }
121
122            $sql .= ($this->isReserved($v) ? " " : ",");
123        }
124        return $parsed['base_expr'] . "(" . substr($sql, 0, -1) . ")" . $this->buildAlias($parsed);
125    }
126
127}
128?>
129