/*
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* Copyright (c) 2013 by syntevo GmbH. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* o Neither the name of syntevo GmbH nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.syntevo.bugtraq;
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import java.util.*;
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import java.util.regex.*;
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import org.jetbrains.annotations.*;
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final class BugtraqParser {
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// Static =================================================================
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@NotNull
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public static BugtraqParser createInstance(@NotNull String idRegex, @Nullable String linkRegex, @Nullable String filterRegex) throws BugtraqException {
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try {
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return new BugtraqParser(idRegex, linkRegex, filterRegex);
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}
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catch (PatternSyntaxException ex) {
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throw new BugtraqException(ex);
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}
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}
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// Fields =================================================================
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private final Pattern idPattern;
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private final Pattern linkPattern;
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private final Pattern filterPattern;
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// Setup ==================================================================
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private BugtraqParser(@NotNull String idRegex, @Nullable String linkRegex, @Nullable String filterRegex) {
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idPattern = compilePatternSafe(idRegex);
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linkPattern = linkRegex != null ? compilePatternSafe(linkRegex) : null;
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filterPattern = filterRegex != null ? compilePatternSafe(filterRegex) : null;
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}
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// Accessing ==============================================================
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@Nullable
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public List<BugtraqParserIssueId> parse(@NotNull String message) {
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List<Part> parts = new ArrayList<Part>();
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parts.add(new Part(message, 0, message.length() - 1));
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if (filterPattern != null) {
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parts = collectParts(parts, filterPattern);
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}
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if (linkPattern != null) {
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parts = collectParts(parts, linkPattern);
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}
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final List<BugtraqParserIssueId> ids = new ArrayList<BugtraqParserIssueId>();
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for (final Part part : parts) {
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final Matcher matcher = idPattern.matcher(part.text);
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while (matcher.find()) {
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final Part subPart = createSubPart(part, matcher, matcher.groupCount() == 0 ? 0 : 1);
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if (subPart == null) {
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continue;
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}
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final BugtraqParserIssueId id;
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if (linkPattern == null) {
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id = new BugtraqParserIssueId(subPart.from, subPart.to, subPart.text);
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}
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else {
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if (matcher.find()) {
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// If we are using links, the last pattern (link) must produce exactly one id.
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continue;
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}
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id = new BugtraqParserIssueId(part.from, part.to, subPart.text);
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}
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if (ids.size() > 0) {
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final BugtraqParserIssueId lastId = ids.get(ids.size() - 1);
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if (id.getFrom() <= lastId.getTo()) {
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continue;
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}
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}
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ids.add(id);
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}
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}
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return ids;
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}
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// Utils ==================================================================
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private static List<Part> collectParts(@NotNull List<Part> mainParts, @NotNull Pattern pattern) {
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final List<Part> subParts = new ArrayList<Part>();
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for (final Part part : mainParts) {
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final Matcher matcher = pattern.matcher(part.text);
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while (matcher.find()) {
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final Part newPart = createSubPart(part, matcher, matcher.groupCount() == 0 ? 0 : 1);
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if (newPart != null) {
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subParts.add(newPart);
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}
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}
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}
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return subParts;
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}
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@Nullable
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private static Part createSubPart(Part part, Matcher matcher, int group) {
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final int textStart = matcher.start(group) + part.from;
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final int textEnd = matcher.end(group) - 1 + part.from;
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if (textEnd < 0) {
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return null;
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}
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return new Part(matcher.group(group), textStart, textEnd);
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}
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private static Pattern compilePatternSafe(String pattern) throws PatternSyntaxException {
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return Pattern.compile(pattern);
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}
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// Inner Classes ==========================================================
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private static class Part {
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private final int from;
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private final int to;
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private final String text;
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public Part(String text, int from, int to) {
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this.text = text;
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this.from = from;
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this.to = to;
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}
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}
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}
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