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Improve arguments parsing
This commit is contained in:
Dmitriy Simushev
parent
bacde14221
commit
17dc20203b
187
src/Handlebars/Arguments.php
Normal file
187
src/Handlebars/Arguments.php
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@ -0,0 +1,187 @@
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<?php
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/**
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* This file is part of Handlebars-php
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*
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* PHP version 5.3
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*
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* @category Xamin
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* @package Handlebars
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* @author Dmitriy Simushev <simushevds@gmail.com>
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* @copyright 2014 Authors
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* @license MIT <http://opensource.org/licenses/MIT>
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* @version GIT: $Id$
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* @link http://xamin.ir
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*/
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namespace Handlebars;
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/**
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* Encapsulates helpers arguments.
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*
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* @category Xamin
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* @package Handlebars
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* @author Dmitriy Simushev <simushevds@gmail.com>
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* @copyright 2014 Authors
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* @license MIT <http://opensource.org/licenses/MIT>
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* @version Release: @package_version@
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* @link http://xamin.ir
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*/
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class Arguments
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{
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/**
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* List of named arguments.
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*
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* @var array
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*/
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protected $namedArgs = array();
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/**
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* List of positional arguments.
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*
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* @var array
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*/
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protected $positionalArgs = array();
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/**
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* The original arguments string that was used to fill in arguments.
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*
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* @var string
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*/
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protected $originalString = '';
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/**
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* Class constructor.
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*
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* @param string $args_string Arguments string as passed to a helper.
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*/
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public function __construct($args_string = false)
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{
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$this->originalString = $args_string;
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if ($args_string) {
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$this->parse($args_string);
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}
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}
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/**
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* Returns string representation of the arguments list.
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*
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* This method is here mostly for backward compatibility reasons.
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*
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* @return string
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*/
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public function __toString()
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{
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return $this->originalString;
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}
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/**
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* Returns a list of named arguments.
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*
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* @return array
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*/
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public function getNamedArguments()
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{
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return $this->namedArgs;
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}
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/**
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* Returns a list of positional arguments.
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*
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* @return array
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*/
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public function getPositionalArguments()
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{
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return $this->positionalArgs;
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}
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/**
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* Breaks an argument string into arguments and stores them inside the
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* object.
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*
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* @param string $args_string Arguments string as passed to a helper.
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*
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* @return void
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* @throws \InvalidArgumentException
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*/
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protected function parse($args_string)
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{
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$bad_chars = preg_quote(Context::NOT_VALID_NAME_CHARS, '#');
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$bad_seg_chars = preg_quote(Context::NOT_VALID_SEGMENT_NAME_CHARS, '#');
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$name_chunk = '(?:[^' . $bad_chars . '\s]+)|(?:\[[^' . $bad_seg_chars . ']+\])';
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$variable_name = '(?:\.\.\/)*(?:(?:' . $name_chunk . ')[\.\/])*(?:' . $name_chunk . ')\.?';
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$escaped_value = '(?:(?<!\\\\)".*?(?<!\\\\)"|(?<!\\\\)\'.*?(?<!\\\\)\')';
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$argument_name = $name_chunk;
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$positional_argument = '#^(' . $variable_name . '|' . $escaped_value . ')#';
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$named_argument = '#^(' . $argument_name . ')\s*=\s*(' . $escaped_value . '|' . $variable_name . ')#';
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$current_str = trim($args_string);
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// Split arguments string
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while (strlen($current_str) !== 0) {
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if (preg_match($named_argument, $current_str, $matches)) {
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// Named argument found
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$name = $this->prepareArgumentName($matches[1]);
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$value = $this->prepareArgumentValue($matches[2]);
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$this->namedArgs[$name] = $value;
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// Remove found argument from arguments string.
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$current_str = ltrim(substr($current_str, strlen($matches[0])));
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} elseif (preg_match($positional_argument, $current_str, $matches)) {
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// A positional argument found. It cannot follow named arguments
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if (count($this->namedArgs) !== 0) {
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throw new \InvalidArgumentException('Positional arguments cannot follow named arguments');
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}
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$this->positionalArgs[] = $this->prepareArgumentValue($matches[1]);
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// Remove found argument from arguments string.
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$current_str = ltrim(substr($current_str, strlen($matches[0])));
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} else {
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throw new \InvalidArgumentException('Malformed arguments string');
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}
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}
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}
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/**
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* Prepares argument's value to add to arguments list.
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*
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* The method unescapes value and wrap it into \Handlebars\String class if
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* needed.
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*
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* @param string $value Argument's value
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*
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* @return string|\Handlebars\String
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*/
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protected function prepareArgumentValue($value)
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{
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// Check if argument's value is a quoted string literal
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if ($value[0] == "'" || $value[0] == '"') {
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// Remove enclosing quotes and unescape
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$value = new String(stripcslashes(substr($value, 1, -1)));
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}
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return $value;
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}
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/**
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* Prepares argument's name.
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*
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* Remove sections braces if needed.
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*
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* @param strign $name Argument's name
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*
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* @return string
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*/
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protected function prepareArgumentName($name)
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{
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// Check if argument's name is a segment
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if ($name[0] == '[') {
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$name = substr($name, 1, -1);
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}
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return $name;
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}
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}
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@ -590,38 +590,14 @@ class Template
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*/
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public function parseNamedArguments($string)
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{
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$variableName = '(?:(?:[^\'"\[\]\s]|\[.+?\])+)';
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$escapedValue = '(?:(?<!\\\\)".*?(?<!\\\\)"|(?<!\\\\)\'.*?(?<!\\\\)\')';
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// Get list of named arguemnts
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$matches = array();
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preg_match_all(
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'#(' . $variableName . ')\s*=\s*(' . $escapedValue . '|' . $variableName . ')#',
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$string,
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$matches,
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PREG_SET_ORDER
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);
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$args = array();
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for ($x = 0, $c = count($matches); $x < $c; $x++) {
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$name = $matches[$x][1];
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$value = $matches[$x][2];
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// Check if argument's name is a segment
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if ($name[0] == '[') {
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$name = substr($name, 1, -1);
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}
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// Check if argument's value is a quoted string literal
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if ($value[0] == "'" || $value[0] == '"') {
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// Remove enclosing quotes and unescape
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$value = new \Handlebars\String(stripcslashes(substr($value, 1, -1)));
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}
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$args[$name] = $value;
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if ($string instanceof Arguments) {
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// This code is needed only for backward compatibility
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$args = $string;
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} else {
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$args = new Arguments($string);
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}
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return $args;
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return $args->getNamedArguments();
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}
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/**
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@ -634,23 +610,13 @@ class Template
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*/
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public function parseArguments($string)
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{
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$args = array();
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preg_match_all('#(?:[^\'"\[\]\s]|\[.+?\])+|(?<!\\\\)("|\')(?:[^\\\\]|\\\\.)*?\1|\S+#s', $string, $args);
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$args = isset($args[0]) ? $args[0] : array();
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for ($x = 0, $argc = count($args); $x < $argc; $x++) {
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// check to see if argument is a quoted string literal
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if ($args[$x][0] == "'" || $args[$x][0] == '"') {
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if ($args[$x][0] === substr($args[$x], -1)) {
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// remove enclosing quotes and unescape
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$args[$x] = new \Handlebars\String(stripcslashes(substr($args[$x], 1, strlen($args[$x]) - 2)));
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} else {
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throw new \RuntimeException("Malformed string: " . $args);
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}
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}
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if ($string instanceof Arguments) {
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// This code is needed only for backward compatibility
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$args = $string;
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} else {
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$args = new Arguments($string);
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}
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return $args;
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return $args->getPositionalArguments();
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}
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}
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@ -983,4 +983,14 @@ class HandlebarsTest extends \PHPUnit_Framework_TestCase
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$this->assertEquals('good', $engine->render('{{#with b}}{{#if this}}{{../../a}}{{/if}}{{/with}}', array('a' => 'good', 'b' => 'stump')));
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$this->assertEquals('good', $engine->render('{{#with b}}{{#unless false}}{{../../a}}{{/unless}}{{/with}}', array('a' => 'good', 'b' => 'stump')));
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}
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/**
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* Test of Arguments to string conversion.
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*/
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public function testArgumentsString()
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{
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$argsString = 'foo bar [foo bar] baz="value"';
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$args = new \Handlebars\Arguments($argsString);
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$this->assertEquals($argsString, (string)$args);
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}
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}
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