library/log4php/helpers/LoggerPatternParser.php
author Markus Broeker<broeker.markus@googlemail.com>
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<?php
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/**
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements. See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License. You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 *
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 * @package log4php
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 */
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/**
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 * Most of the work of the {@link LoggerPatternLayout} class
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 * is delegated to the {@link LoggerPatternParser} class.
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 *
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 * <p>It is this class that parses conversion patterns and creates
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 * a chained list of {@link LoggerPatternConverter} converters.</p>
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 *
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 * @version $Revision: 1395467 $
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 * @package log4php
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 * @subpackage helpers
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 *
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 * @since 0.3
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 */
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class LoggerPatternParser {
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    /** Escape character for conversion words in the conversion pattern. */
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    const ESCAPE_CHAR = '%';
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    /** Maps conversion words to relevant converters. */
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    private $converterMap;
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    /** Conversion pattern used in layout. */
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    private $pattern;
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    /** Regex pattern used for parsing the conversion pattern. */
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    private $regex;
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    /**
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     * First converter in the chain.
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     * @var LoggerPatternConverter
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     */
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    private $head;
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    /** Last converter in the chain. */
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    private $tail;
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    public function __construct($pattern, $converterMap) {
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        $this->pattern = $pattern;
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        $this->converterMap = $converterMap;
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        // Construct the regex pattern
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        $this->regex =
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            '/' .                       // Starting regex pattern delimiter
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            self::ESCAPE_CHAR .         // Character which marks the start of the conversion pattern
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            '(?P<modifiers>[0-9.-]*)' . // Format modifiers (optional)
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            '(?P<word>[a-zA-Z]+)' .     // The conversion word
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            '(?P<option>{[^}]*})?' .    // Conversion option in braces (optional)
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            '/';                        // Ending regex pattern delimiter
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    }
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    /**
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     * Parses the conversion pattern string, converts it to a chain of pattern
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     * converters and returns the first converter in the chain.
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     *
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     * @return LoggerPatternConverter
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     */
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    public function parse() {
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        // Skip parsing if the pattern is empty
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        if (empty($this->pattern)) {
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            $this->addLiteral('');
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            return $this->head;
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        }
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        // Find all conversion words in the conversion pattern
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        $count = preg_match_all($this->regex, $this->pattern, $matches, PREG_OFFSET_CAPTURE);
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        if ($count === false) {
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            $error = error_get_last();
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            throw new LoggerException("Failed parsing layotut pattern: {$error['message']}");
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        }
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        $prevEnd = 0;
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        foreach ($matches[0] as $key => $item) {
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            // Locate where the conversion command starts and ends
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            $length = strlen($item[0]);
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            $start = $item[1];
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            $end = $item[1] + $length;
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            // Find any literal expressions between matched commands
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            if ($start > $prevEnd) {
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                $literal = substr($this->pattern, $prevEnd, $start - $prevEnd);
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                $this->addLiteral($literal);
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            }
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            // Extract the data from the matched command
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            $word = !empty($matches['word'][$key]) ? $matches['word'][$key][0] : null;
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            $modifiers = !empty($matches['modifiers'][$key]) ? $matches['modifiers'][$key][0] : null;
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            $option = !empty($matches['option'][$key]) ? $matches['option'][$key][0] : null;
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            // Create a converter and add it to the chain
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            $this->addConverter($word, $modifiers, $option);
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            $prevEnd = $end;
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        }
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        // Add any trailing literals
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        if ($end < strlen($this->pattern)) {
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            $literal = substr($this->pattern, $end);
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            $this->addLiteral($literal);
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        }
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        return $this->head;
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    }
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    /**
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     * Adds a literal converter to the converter chain.
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     * @param string $string The string for the literal converter.
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     */
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    private function addLiteral($string) {
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        $converter = new LoggerPatternConverterLiteral($string);
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        $this->addToChain($converter);
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    }
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    /**
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     * Adds a non-literal converter to the converter chain.
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     *
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     * @param string $word The conversion word, used to determine which
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     *  converter will be used.
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     * @param string $modifiers Formatting modifiers.
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     * @param string $option Option to pass to the converter.
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     */
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    private function addConverter($word, $modifiers, $option) {
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        $formattingInfo = $this->parseModifiers($modifiers);
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        $option = trim($option, "{} ");
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        if (isset($this->converterMap[$word])) {
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            $converter = $this->getConverter($word, $formattingInfo, $option);
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            $this->addToChain($converter);
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        } else {
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            trigger_error("log4php: Invalid keyword '%$word' in converison pattern. Ignoring keyword.", E_USER_WARNING);
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        }
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    }
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    /**
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     * Determines which converter to use based on the conversion word. Creates
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     * an instance of the converter using the provided formatting info and
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     * option and returns it.
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     *
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     * @param string $word The conversion word.
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     * @param LoggerFormattingInfo $info Formatting info.
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     * @param string $option Converter option.
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     *
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     * @throws LoggerException
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     *
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     * @return LoggerPatternConverter
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     */
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    private function getConverter($word, $info, $option) {
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        if (!isset($this->converterMap[$word])) {
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            throw new LoggerException("Invalid keyword '%$word' in converison pattern. Ignoring keyword.");
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        }
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        $converterClass = $this->converterMap[$word];
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        if (!class_exists($converterClass)) {
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            throw new LoggerException("Class '$converterClass' does not exist.");
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        }
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        $converter = new $converterClass($info, $option);
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        if (!($converter instanceof LoggerPatternConverter)) {
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            throw new LoggerException("Class '$converterClass' is not an instance of LoggerPatternConverter.");
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        }
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        return $converter;
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    }
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    /** Adds a converter to the chain and updates $head and $tail pointers. */
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    private function addToChain(LoggerPatternConverter $converter) {
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        if (!isset($this->head)) {
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            $this->head = $converter;
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            $this->tail = $this->head;
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        } else {
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            $this->tail->next = $converter;
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            $this->tail = $this->tail->next;
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        }
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    }
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    /**
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     * Parses the formatting modifiers and produces the corresponding
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     * LoggerFormattingInfo object.
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     *
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     * @param string $modifier
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     * @return LoggerFormattingInfo
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     * @throws LoggerException
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     */
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    private function parseModifiers($modifiers) {
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        $info = new LoggerFormattingInfo();
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        // If no modifiers are given, return default values
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        if (empty($modifiers)) {
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            return $info;
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        }
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        // Validate
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        $pattern = '/^(-?[0-9]+)?\.?-?[0-9]+$/';
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        if (!preg_match($pattern, $modifiers)) {
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            trigger_error("log4php: Invalid modifier in conversion pattern: [$modifiers]. Ignoring modifier.", E_USER_WARNING);
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            return $info;
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        }
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        $parts = explode('.', $modifiers);
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        if (!empty($parts[0])) {
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            $minPart = (integer)$parts[0];
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            $info->min = abs($minPart);
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            $info->padLeft = ($minPart > 0);
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        }
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        if (!empty($parts[1])) {
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            $maxPart = (integer)$parts[1];
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            $info->max = abs($maxPart);
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            $info->trimLeft = ($maxPart < 0);
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        }
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        return $info;
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    }
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}