1: <?php
 2: namespace Pharborist\Types;
 3: 
 4: use Pharborist\ExpressionNode;
 5: use Pharborist\TokenNode;
 6: 
 7: /**
 8:  * A string, like e.g. `'hello world'` or `"We are the knights who say, 'Ni!'"`. This
 9:  * does *not* include strings interspersed with variables or other expressions --
10:  * those are handled by InterpolatedStringNode.
11:  *
12:  * @see \Pharborist\InterpolatedStringNode
13:  */
14: class StringNode extends TokenNode implements ExpressionNode, ScalarNode {
15:   /**
16:    * Creates a new constant string.
17:    *
18:    * @param string $text
19:    *  The text of the string.
20:    *
21:    * @return StringNode
22:    */
23:   public static function create($text) {
24:     return new StringNode(T_CONSTANT_ENCAPSED_STRING, $text);
25:   }
26: 
27:   /**
28:    * Returns the original value of the string (unenclosed by quotes).
29:    *
30:    * @return string
31:    */
32:   public function toValue() {
33:     $text = $this->getText();
34:     $quote_char = $text[0];
35:     $text = substr($text, 1, -1);
36:     if ($quote_char === '"') {
37:       $rules = array(
38:         preg_quote('\\\\') => '\\',
39:         preg_quote('\n') => "\n",
40:         preg_quote('\t') => "\t",
41:         preg_quote('\"') => '"',
42:         preg_quote('\$') => '$',
43:         preg_quote('\r') => "\r",
44:         preg_quote('\v') => "\v",
45:         preg_quote('\f') => "\f",
46:         preg_quote('\e') => "\e",
47:         '\\\\[0-7]{1,3}' => '__octal__',
48:         '\\\\x[0-9A-Fa-f]{1,2}' => '__hex__',
49:       );
50:     }
51:     else {
52:       $rules = array(
53:         preg_quote('\\\\') => '\\',
54:         preg_quote("\\'") => "'"
55:       );
56:     }
57:     $replacements = array_values($rules);
58:     $regex = '@(' . implode(')|(', array_keys($rules)) . ')@';
59:     return preg_replace_callback($regex, function ($matches) use ($replacements) {
60:       // find the first non-empty element (but skipping $matches[0]) using a quick for loop
61:       for ($i = 1; '' === $matches[$i]; ++$i);
62: 
63:       $match = $matches[0];
64:       $replacement = $replacements[$i - 1];
65:       if ($replacement === '__octal__') {
66:         $replacement = chr(octdec(substr($match, 1)));
67:       }
68:       elseif ($replacement === '__hex__') {
69:         $replacement = chr(hexdec(substr($match, 2)));
70:       }
71:       return $replacement;
72:     }, $text);
73:   }
74: }
75: