| // Copyright (C) 2009 The Android Open Source Project |
| // |
| // 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.google.gwtexpui.safehtml.client; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public abstract class PrettyFormatter { |
| private static final Map<String, MultiLineStyle> STYLES; |
| private static final MultiLineStyle DEFAULT_STYLE = new MultiLineStyle() {}; |
| static { |
| STYLES = new HashMap<String, MultiLineStyle>(); |
| |
| MultiLineStyle c = new MultiLineStyle.Simple("/*", "*/"); |
| STYLES.put("h", c); |
| STYLES.put("c", c); |
| STYLES.put("cc", c); |
| STYLES.put("cpp", c); |
| STYLES.put("cxx", c); |
| STYLES.put("cyc", c); |
| STYLES.put("m", c); |
| STYLES.put("cs", c); |
| STYLES.put("java", c); |
| STYLES.put("js", c); |
| STYLES.put("css", c); |
| |
| MultiLineStyle xml = new MultiLineStyle.Simple("<!--", "-->"); |
| STYLES.put("xml", xml); |
| STYLES.put("html", xml); |
| STYLES.put("sgml", xml); |
| } |
| |
| private static MultiLineStyle getCommentStyle(final String lang) { |
| MultiLineStyle style = STYLES.get(lang); |
| return style != null ? style : DEFAULT_STYLE; |
| } |
| |
| public static PrettyFormatter newFormatter(String lang) { |
| return Pretty.loaded ? new Pretty(lang) : new PassThrough(); |
| } |
| |
| private boolean showWhiteSpaceErrors; |
| private int lineLength = 100; |
| |
| public void setShowWhiteSpaceErrors(final boolean show) { |
| showWhiteSpaceErrors = show; |
| } |
| |
| public void setLineLength(final int len) { |
| lineLength = len; |
| } |
| |
| public SafeHtml format(String line) { |
| SafeHtml html = new SafeHtmlBuilder().append(wrapLines(line)); |
| if (showWhiteSpaceErrors) { |
| html = showTabAfterSpace(html); |
| html = showTrailingWhitespace(html); |
| } |
| html = prettify(html); |
| return html; |
| } |
| |
| public void update(String line) { |
| } |
| |
| private String wrapLines(final String src) { |
| if (lineLength <= 0) { |
| // Caller didn't request for line wrapping; use it unmodified. |
| // |
| return src; |
| } |
| if (src.length() < lineLength && src.indexOf('\t') < 0) { |
| // We're too short and there are no horizontal tabs, line is fine |
| // as-is so bypass the longer line wrapping code below. |
| return src; |
| } |
| |
| final StringBuilder r = new StringBuilder(); |
| int lineLen = 0; |
| for (int i = 0; i < src.length(); i++) { |
| final char c = src.charAt(i); |
| final int cLen = c == '\t' ? 8 : 1; |
| if (lineLen >= lineLength) { |
| r.append('\n'); |
| lineLen = 0; |
| } |
| r.append(c); |
| lineLen += cLen; |
| } |
| return r.toString(); |
| } |
| |
| |
| private static SafeHtml showTabAfterSpace(SafeHtml src) { |
| return src.replaceFirst("^( *\t)", |
| "<span class=\"gerrit-whitespaceerror\">$1</span>"); |
| } |
| |
| private static SafeHtml showTrailingWhitespace(SafeHtml src) { |
| return src.replaceFirst("([ \t][ \t]*)(\r?\n?)$", |
| "<span class=\"gerrit-whitespaceerror\">$1</span>$2"); |
| } |
| |
| protected SafeHtml prettify(SafeHtml line) { |
| return line; |
| } |
| |
| private static class PassThrough extends PrettyFormatter { |
| } |
| |
| private static class Pretty extends PrettyFormatter { |
| static final boolean loaded = isLoaded(); |
| |
| private static native boolean isLoaded() |
| /*-{ return $wnd['prettyPrintOne'] != null }-*/; |
| |
| private final String srcType; |
| private final MultiLineStyle commentStyle; |
| private MultiLineStyle currentStyle; |
| |
| Pretty(final String lang) { |
| srcType = lang; |
| commentStyle = getCommentStyle(lang); |
| } |
| |
| @Override |
| protected SafeHtml prettify(final SafeHtml src) { |
| String line = src.asString().replaceAll("'", "'"); |
| |
| if (currentStyle != null) { |
| final boolean isEnd = currentStyle.isEnd(line); |
| |
| line = currentStyle.restart(line); |
| line = prettifyNative(line, srcType); |
| line = currentStyle.unrestart(line); |
| |
| if (isEnd) { |
| currentStyle = null; |
| } |
| } else { |
| currentStyle = commentStyle.isStart(line); |
| line = prettifyNative(line, srcType); |
| } |
| |
| return SafeHtml.asis(line); |
| } |
| |
| @Override |
| public void update(String line) { |
| if (currentStyle != null) { |
| if (currentStyle.isEnd(line)) { |
| currentStyle = null; |
| } |
| } else { |
| currentStyle = commentStyle.isStart(line); |
| } |
| } |
| |
| private static native String prettifyNative(String srcText, String srcType) |
| /*-{ return $wnd.prettyPrintOne(srcText, srcType); }-*/; |
| } |
| } |