+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
package com.hughes.android.dictionary.parser;
import java.util.ArrayList;
+import java.util.LinkedHashMap;
import java.util.List;
+import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public final class WikiTokenizer {
//private static final Pattern wikiTokenEvent = Pattern.compile("($)", Pattern.MULTILINE);
- private static final Pattern wikiTokenEvent = Pattern.compile("(\\{\\{|\\}\\}|\\[\\[|\\]\\]|<!--|''|$)", Pattern.MULTILINE);
+ private static final Pattern wikiTokenEvent = Pattern.compile("(" +
+ "\\{\\{|\\}\\}|" +
+ "\\[\\[|\\]\\]|" +
+ "\\||" + // Need the | because we might have to find unescaped pipes
+ "=|" + // Need the = because we might have to find unescaped =
+ "<!--|" +
+ "''|" +
+ "$)", Pattern.MULTILINE);
private static final String listChars = "*#:;";
- final String wikiText;
- final Matcher matcher;
+ final String wikiText;
+ final Matcher matcher;
- boolean justReturnedNewline = true;
- int end = 0;
- int start = -1;
+ boolean justReturnedNewline = true;
+ int lastLineStart = 0;
+ int end = 0;
+ int start = -1;
+
+ final List<String> errors = new ArrayList<String>();
+ final List<String> tokenStack = new ArrayList<String>();
+
+
+ private String headingWikiText;
+ private int headingDepth;
+ private int listPrefixEnd;
+ private boolean isPlainText;
+ private boolean isMarkup;
+ private boolean isComment;
+ private boolean isFunction;
+ private boolean isWikiLink;
+ private int firstUnescapedPipePos;
+
+ private int lastUnescapedPipePos;
+ private int lastUnescapedEqualsPos;
+ private final List<String> positionArgs = new ArrayList<String>();
+ private final Map<String,String> namedArgs = new LinkedHashMap<String,String>();
+
- public String header;
- public int headerDepth;
-
- final List<String> tokenStack = new ArrayList<String>();
-
public WikiTokenizer(final String wikiText) {
+ this(wikiText, true);
+ }
+
+ public WikiTokenizer(final String wikiText, final boolean isNewline) {
this.wikiText = wikiText;
this.matcher = wikiTokenEvent.matcher(wikiText);
+ justReturnedNewline = isNewline;
}
-
+
private void clear() {
- header = null;
- headerDepth = 0;
+ errors.clear();
tokenStack.clear();
+
+ headingWikiText = null;
+ headingDepth = -1;
+ listPrefixEnd = -1;
+ isPlainText = false;
+ isMarkup = false;
+ isComment = false;
+ isFunction = false;
+ isWikiLink = false;
+
+ firstUnescapedPipePos = -1;
+ lastUnescapedPipePos = -1;
+ lastUnescapedEqualsPos = -1;
+ positionArgs.clear();
+ namedArgs.clear();
+ }
+
+ public boolean isNewline() {
+ return justReturnedNewline;
+ }
+
+ public void returnToLineStart() {
+ end = start = lastLineStart;
+ justReturnedNewline = true;
+ }
+
+ public boolean isHeading() {
+ return headingWikiText != null;
+ }
+
+ public String headingWikiText() {
+ assert isHeading();
+ return headingWikiText;
+ }
+
+ public int headingDepth() {
+ assert isHeading();
+ return headingDepth;
+ }
+
+ public boolean isMarkup() {
+ return isMarkup;
+ }
+
+ public boolean isComment() {
+ return isComment;
+ }
+
+ public boolean isListItem() {
+ return listPrefixEnd != -1;
+ }
+
+ public String listItemPrefix() {
+ assert isListItem();
+ return wikiText.substring(start, listPrefixEnd);
+ }
+
+ public String listItemWikiText() {
+ assert isListItem();
+ return wikiText.substring(listPrefixEnd, end);
+ }
+
+ public boolean isFunction() {
+ return isFunction;
+ }
+
+ public String functionName() {
+ assert isFunction();
+ // "{{.."
+ if (firstUnescapedPipePos != -1) {
+ return wikiText.substring(start + 2, firstUnescapedPipePos);
+ }
+ return wikiText.substring(start + 2, end - 2);
+ }
+
+ public List<String> functionPositionArgs() {
+ return positionArgs;
+ }
+
+ public Map<String, String> functionNamedArgs() {
+ return namedArgs;
+ }
+
+ public boolean isPlainText() {
+ return isPlainText;
+ }
+
+ public boolean isWikiLink() {
+ return isWikiLink;
+ }
+
+ public String wikiLinkText() {
+ assert isWikiLink();
+ // "[[.."
+ if (lastUnescapedPipePos != -1) {
+ return wikiText.substring(lastUnescapedPipePos + 1, end - 2);
+ }
+ assert start + 2 < wikiText.length() && end >= 2: wikiText;
+ return wikiText.substring(start + 2, end - 2);
}
+ public String wikiLinkDest() {
+ assert isWikiLink();
+ // "[[.."
+ if (firstUnescapedPipePos != -1) {
+ return wikiText.substring(start + 2, firstUnescapedPipePos);
+ }
+ return null;
+ }
+
+ public boolean remainderStartsWith(final String prefix) {
+ return wikiText.startsWith(prefix, start);
+ }
+
+ public void nextLine() {
+ final int oldStart = start;
+ while(nextToken() != null && !isNewline()) {}
+ if (isNewline()) {
+ --end;
+ }
+ start = oldStart;
+ }
+
public WikiTokenizer nextToken() {
this.clear();
start = end;
+ if (justReturnedNewline) {
+ lastLineStart = start;
+ }
+
+ try {
+
final int len = wikiText.length();
if (start >= len) {
return null;
}
// Eat a newline if we're looking at one:
- final boolean atNewline = wikiText.charAt(end) == '\n';
+ final boolean atNewline = wikiText.charAt(end) == '\n' || wikiText.charAt(end) == '\u2028';
if (atNewline) {
justReturnedNewline = true;
++end;
return this;
}
- if (justReturnedNewline) {
+ if (justReturnedNewline) {
+ justReturnedNewline = false;
+
final char firstChar = wikiText.charAt(end);
if (firstChar == '=') {
final int headerStart = end;
+ // Skip ===...
while (++end < len && wikiText.charAt(end) == '=') {}
final int headerTitleStart = end;
- while (++end < len && wikiText.charAt(end) != '=' && wikiText.charAt(end) != '\n') {}
+ headingDepth = headerTitleStart - headerStart;
+ // Skip non-=...
+ if (end < len) {
+ final int nextNewline = safeIndexOf(wikiText, end, "\n", "\n");
+ final int closingEquals = escapedFindEnd(end, "=");
+ if (wikiText.charAt(closingEquals - 1) == '=') {
+ end = closingEquals - 1;
+ } else {
+ end = nextNewline;
+ }
+ }
final int headerTitleEnd = end;
- while (++end < len && wikiText.charAt(end) == '=') {}
+ headingWikiText = wikiText.substring(headerTitleStart, headerTitleEnd);
+ // Skip ===...
+ while (end < len && ++end < len && wikiText.charAt(end) == '=') {}
final int headerEnd = end;
-
+ if (headerEnd - headerTitleEnd != headingDepth) {
+ errors.add("Mismatched header depth: " + token());
+ }
return this;
}
if (listChars.indexOf(firstChar) != -1) {
while (++end < len && listChars.indexOf(wikiText.charAt(end)) != -1) {}
- end = escapedFind(start, "\n");
+ listPrefixEnd = end;
+ end = escapedFindEnd(start, "\n");
return this;
}
}
- justReturnedNewline = false;
if (wikiText.startsWith("'''", start)) {
+ isMarkup = true;
end = start + 3;
return this;
}
if (wikiText.startsWith("''", start)) {
+ isMarkup = true;
end = start + 2;
return this;
}
if (wikiText.startsWith("[[", start)) {
- end = escapedFind(start + 2, "]]");
+ end = escapedFindEnd(start + 2, "]]");
+ isWikiLink = errors.isEmpty();
return this;
}
- if (wikiText.startsWith("{{", start)) {
- end = escapedFind(start + 2, "}}");
+ if (wikiText.startsWith("{{", start)) {
+ end = escapedFindEnd(start + 2, "}}");
+ isFunction = errors.isEmpty();
return this;
}
}
if (wikiText.startsWith("<!--", start)) {
+ isComment = true;
end = safeIndexOf(wikiText, start, "-->", "\n");
return this;
}
if (wikiText.startsWith("}}", start) || wikiText.startsWith("]]", start)) {
- System.err.println("Close without open!");
+ errors.add("Close without open!");
end += 2;
return this;
}
+ if (wikiText.charAt(start) == '|' || wikiText.charAt(start) == '=') {
+ isPlainText = true;
+ ++end;
+ return this;
+ }
+
if (this.matcher.find(start)) {
end = this.matcher.start(1);
+ isPlainText = true;
if (end == start) {
- System.err.println(this.matcher.group());
+ errors.add("Empty group: " + this.matcher.group());
assert false;
}
return this;
end = wikiText.length();
return this;
+ } finally {
+ if (!errors.isEmpty()) {
+ System.err.println("Errors: " + errors + ", token=" + token());
+ }
+ }
+
}
public String token() {
- return wikiText.substring(start, end);
+ final String token = wikiText.substring(start, end);
+ assert token.equals("\n") || !token.endsWith("\n") : "token='" + token + "'";
+ return token;
}
- private int escapedFind(final int start, final String toFind) {
+ private int escapedFindEnd(final int start, final String toFind) {
assert tokenStack.isEmpty();
+ final boolean insideFunction = toFind.equals("}}");
+
int end = start;
+ int firstNewline = -1;
while (end < wikiText.length()) {
if (matcher.find(end)) {
final String matchText = matcher.group();
final int matchStart = matcher.start();
+ assert matcher.end() > end || matchText.length() == 0: "Group=" + matcher.group();
if (matchText.length() == 0) {
assert matchStart == wikiText.length() || wikiText.charAt(matchStart) == '\n';
+ if (firstNewline == -1) {
+ firstNewline = matcher.end();
+ }
if (tokenStack.isEmpty() && toFind.equals("\n")) {
return matchStart;
}
++end;
} else if (tokenStack.isEmpty() && matchText.equals(toFind)) {
// The normal return....
+ if (insideFunction) {
+ addFunctionArg(insideFunction, matchStart);
+ }
return matcher.end();
} else if (matchText.equals("[[") || matchText.equals("{{")) {
tokenStack.add(matchText);
if (tokenStack.size() > 0) {
final String removed = tokenStack.remove(tokenStack.size() - 1);
if (removed.equals("{{") && !matcher.group().equals("}}")) {
- System.err.println("Unmatched {{ error: " + wikiText.substring(start));
+ errors.add("Unmatched {{ error: " + wikiText.substring(start));
return safeIndexOf(wikiText, start, "\n", "\n");
} else if (removed.equals("[[") && !matcher.group().equals("]]")) {
- System.err.println("Unmatched [[ error: " + wikiText.substring(start));
+ errors.add("Unmatched [[ error: " + wikiText.substring(start));
return safeIndexOf(wikiText, start, "\n", "\n");
}
} else {
- System.err.println("Pop too many error: " + wikiText.substring(start).replaceAll("\n", "\\n"));
+ errors.add("Pop too many error: " + wikiText.substring(start).replaceAll("\n", "\\\\n"));
// If we were looking for a newline
return safeIndexOf(wikiText, start, "\n", "\n");
}
+ } else if (matchText.equals("|")) {
+ if (tokenStack.isEmpty()) {
+ addFunctionArg(insideFunction, matchStart);
+ }
+ } else if (matchText.equals("=")) {
+ if (tokenStack.isEmpty()) {
+ lastUnescapedEqualsPos = matchStart;
+ }
+ // Do nothing. These can match spuriously, and if it's not the thing
+ // we're looking for, keep on going.
} else if (matchText.equals("<!--")) {
end = wikiText.indexOf("-->");
if (end == -1) {
- System.err.println("Unmatched <!-- error: " + wikiText.substring(start));
+ errors.add("Unmatched <!-- error: " + wikiText.substring(start));
+ return safeIndexOf(wikiText, start, "\n", "\n");
}
+ } else if (matchText.equals("''")) {
+ // Don't care.
} else {
assert false : "Match text='" + matchText + "'";
throw new IllegalStateException();
}
} else {
// Hmmm, we didn't find the closing symbol we were looking for...
- System.err.println("Couldn't find: " + toFind + ", "+ wikiText.substring(start));
+ errors.add("Couldn't find: " + toFind + ", "+ wikiText.substring(start));
return safeIndexOf(wikiText, start, "\n", "\n");
}
- // Inside the while loop.
+ // Inside the while loop. Just go forward.
end = Math.max(end, matcher.end());
}
+ if (toFind.equals("\n") && tokenStack.isEmpty()) {
+ // We were looking for the end, we got it.
+ return end;
+ }
+ if (firstNewline != -1) {
+ errors.add("Couldn't find: " + toFind + ", "+ wikiText.substring(start));
+ return firstNewline;
+ }
return end;
}
+ private void addFunctionArg(final boolean insideFunction, final int matchStart) {
+ if (firstUnescapedPipePos == -1) {
+ firstUnescapedPipePos = lastUnescapedPipePos = matchStart;
+ } else if (insideFunction) {
+ if (lastUnescapedEqualsPos > lastUnescapedPipePos) {
+ final String key = wikiText.substring(lastUnescapedPipePos + 1, lastUnescapedEqualsPos);
+ final String value = wikiText.substring(lastUnescapedEqualsPos + 1, matchStart);
+ namedArgs.put(key, value);
+ } else {
+ final String value = wikiText.substring(lastUnescapedPipePos + 1, matchStart);
+ positionArgs.add(value);
+ }
+ }
+ lastUnescapedPipePos = matchStart;
+ }
+
static int safeIndexOf(final String s, final int start, final String target, final String backup) {
int close = s.indexOf(target, start);
if (close != -1) {
- return close + target.length();
+ // Don't step over a \n.
+ return close + (target.equals("\n") ? 0 : target.length());
}
close = s.indexOf(backup, start);
if (close != -1) {
- return close + backup.length();
+ return close + (backup.equals("\n") ? 0 : backup.length());
}
return s.length();
}
+ public static String toPlainText(final String wikiText) {
+ final WikiTokenizer wikiTokenizer = new WikiTokenizer(wikiText);
+ final StringBuilder builder = new StringBuilder();
+ while (wikiTokenizer.nextToken() != null) {
+ if (wikiTokenizer.isPlainText()) {
+ builder.append(wikiTokenizer.token());
+ } else if (wikiTokenizer.isWikiLink()) {
+ builder.append(wikiTokenizer.wikiLinkText());
+ } else if (wikiTokenizer.isNewline()) {
+ builder.append("\n");
+ } else if (wikiTokenizer.isFunction()) {
+ builder.append(wikiTokenizer.token());
+ }
+ }
+ return builder.toString();
+ }
+
+ public static StringBuilder appendFunction(final StringBuilder builder, final String name, List<String> args,
+ final Map<String, String> namedArgs) {
+ builder.append(name);
+ for (final String arg : args) {
+ builder.append("|").append(arg);
+ }
+ for (final Map.Entry<String, String> entry : namedArgs.entrySet()) {
+ builder.append("|").append(entry.getKey()).append("=").append(entry.getValue());
+ }
+ return builder;
+ }
+
}
projects / DictionaryPC.git / blobdiff