SJMForm.php

<?php 

class SJMForm {
	public $parser = null;
	private $tree = array();
	
	public function __construct($fml = null) {
		// support legacy usage
		if ($fml !== null) {
			$this->parse($fml);
		}
	}
	public function parse($fml) {
		if ($this->parser === null) {
			require_once('SJMForm.parser.php');
			$this->parser = new SJMFormParser();
			// require_once('SJMForm.regex.php');
			// $this->parser = new SJMFormRegex();
		}
		$ast = $this->parser->parse($fml);
		$this->tree = $ast;
	}
	
	// compile form
	public function __toString() {
		$out = '';
		foreach ($this->tree as $node) {
			$method = 'produce_'.$node->type;
			if(!method_exists($this, $method)) continue;
			$out .= $this->$method($node);
		}
		return $out;
	}
	
	// preprocess data received from the form
	public function preprocess($data) {
		$out = array();
		foreach ($this->tree as $node) {
			$name = $node->name;
			if ($node->type=='checkbox') {
				// checkboxes don't send anything for unchecked boxes
				foreach ($node->childNodes as $child) {
					$key = "{$name}_{$child->name}";
					$out[$key] = isset($data[$key]);
				}
			} else {
				$value = isset($data[$name]) ? $data[$name] : '';
				$out[$name] = $value;
			}
		}
		return $out;
	}
	
	// set form values
	public function set($data) {
		foreach ($this->tree as $node) {
			$type = $node->type;
			$name = $node->name;
			// special handling for checkboxes
			if ($type=='checkbox') {
				foreach ($node->childNodes as $child) {
					$key = $name.'_'.$child->name;
					if (!isset($data[$key])) continue;
					$child->args[1] = $data[$key];
				}
				continue;
			}
			// do we have a value for the current node?
			if (!isset($data[$name])) continue;
			$value = $data[$name];
			// handle radio buttons and select
			if ($type=='radio' || $type=='select') {
				foreach ($node->childNodes as $child) {
					$child->args[1] = $value == $child->name;
				}
				continue;
			}
			// hidden fields have no display name argument
			if ($type=='hidden') {
				$node->args[0] = $value;
				continue;
			}
			// all other types have their value as second argument
			$node->args[1] = $value;
		}
	}
	
	// html generators
	private function produce_hidden($e) {
		if (!isset($e->args[0])) $e->args[0] = '';
		return "<input type=\"hidden\" name=\"$e->name\" value=\"".htmlentities($e->args[0])."\" id=\"$e->name\">\n";
	}
	private function produce_text($e) {
		if (!isset($e->args[1])) $e->args[1] = '';
		$out = "<dt><label for=\"$e->name\">".htmlentities($e->args[0])."</label></dt>\n";
		$out .= "<dd><input type=\"text\" name=\"$e->name\" value=\"".htmlentities($e->args[1])."\"  size=\"30\" id=\"$e->name\"></dd>\n";
		return $out;
	}
	private function produce_password($e) {
		if (!isset($e->args[1])) $e->args[1] = '';
		$out = "<dt><label for=\"$e->name\">".htmlentities($e->args[0])."</label></dt>\n";
		$out .= "<dd><input type=\"password\" name=\"$e->name\" value=\"".htmlentities($e->args[1])."\"  size=\"30\" id=\"$e->name\"></dd>\n";
		return $out;
	}
	private function produce_textarea($e) {
		if (!isset($e->args[1])) $e->args[1] = '';
		$out = "<dt><label for=\"$e->name\">".htmlentities($e->args[0])."</label></dt>\n";
		$out .= "<dd><textarea name=\"$e->name\" rows=\"6\" cols=\"40\" id=\"$e->name\">".htmlentities($e->args[1])."</textarea></dd>\n";
		return $out;
	}
	private function produce_radio($e) {
		$out = "<dt><label>".htmlentities($e->args[0])."</label></dt>\n";
		foreach ($e->childNodes as $c) {
			if (!isset($c->args[1])) $c->args[1] = false;
			$checked = ($c->args[1]) ? ' checked' : '';
			$id = $e->name.'_'.$c->name;
			$out .= "<dd>\n";
			$out .= "\t<input type=\"radio\" name=\"$e->name\" value=\"$c->name\" id=\"$id\"$checked>\n";
			$out .= "\t<label for=\"$id\">".htmlentities($c->args[0])."</label>\n";
			$out .= "</dd>\n";
		}
		return $out;
	}
	private function produce_checkbox($e) {
		$out = "<dt><label>".htmlentities($e->args[0])."</label></dt>";
		foreach ($e->childNodes as $c) {
			if (!isset($c->args[1])) $c->args[1] = false;
			$checked = ($c->args[1]) ? ' checked' : '';
			$id = $e->name.'_'.$c->name;
			$out .= "<dd>\n";
			$out .= "\t<input type=\"checkbox\" name=\"$id\" value=\"1\" id=\"$id\"$checked>\n";
			$out .= "\t<label for=\"$id\">".htmlentities($c->args[0])."</label>\n";
			$out .= "</dd>\n";
		}
		return $out;
	}
	private function produce_select($e) {
		$out = "<dt><label for=\"$e->name\">".htmlentities($e->args[0])."</label></dt>\n";
		$out .= "<dd>\n";
		$out .= "\t<select size=\"1\" name=\"$e->name\" id=\"$e->name\">\n";
		foreach ($e->childNodes as $c) {
			if (!isset($c->args[1])) $c->args[1] = false;
			$selected = ($c->args[1]) ? ' selected=\"selected\"' : '';
			$out .= "\t<option value=\"$c->name\"$selected>".htmlentities($c->args[0])."</option>\n";
		}
		$out .= "</select>\n";
		$out .= "</dd>\n";
		return $out;
	}
}