1 | /******************************************************************************* |
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2 | * Copyright (c) 2000, 2006 IBM Corporation and others. |
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3 | * All rights reserved. This program and the accompanying materials |
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4 | * are made available under the terms of the Eclipse Public License v1.0 |
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5 | * which accompanies this distribution, and is available at |
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6 | * http://www.eclipse.org/legal/epl-v10.html |
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7 | * |
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8 | * Contributors: |
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9 | * IBM Corporation - initial API and implementation |
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10 | *******************************************************************************/ |
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11 | package org.modelica.mdt.ui.hover; |
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12 | |
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13 | |
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14 | import java.io.IOException; |
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15 | import java.io.Reader; |
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16 | import java.net.URL; |
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17 | |
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18 | import org.eclipse.swt.SWT; |
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19 | import org.eclipse.swt.SWTError; |
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20 | import org.eclipse.swt.graphics.RGB; |
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21 | import org.eclipse.swt.widgets.Display; |
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22 | |
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23 | |
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24 | /** |
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25 | * Provides a set of convenience methods for creating HTML pages. |
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26 | */ |
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27 | public class HTMLPrinter { |
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28 | |
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29 | private static RGB BG_COLOR_RGB= null; |
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30 | |
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31 | static { |
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32 | final Display display= Display.getDefault(); |
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33 | if (display != null && !display.isDisposed()) { |
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34 | try { |
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35 | display.asyncExec(new Runnable() { |
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36 | /* |
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37 | * @see java.lang.Runnable#run() |
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38 | */ |
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39 | public void run() { |
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40 | BG_COLOR_RGB= display.getSystemColor(SWT.COLOR_INFO_BACKGROUND).getRGB(); |
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41 | } |
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42 | }); |
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43 | } catch (SWTError err) { |
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44 | // see: https://bugs.eclipse.org/bugs/show_bug.cgi?id=45294 |
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45 | if (err.code != SWT.ERROR_DEVICE_DISPOSED) |
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46 | throw err; |
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47 | } |
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48 | } |
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49 | } |
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50 | |
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51 | private HTMLPrinter() { |
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52 | } |
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53 | |
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54 | private static String replace(String text, char c, String s) { |
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55 | |
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56 | int previous= 0; |
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57 | int current= text.indexOf(c, previous); |
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58 | |
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59 | if (current == -1) |
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60 | return text; |
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61 | |
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62 | StringBuffer buffer= new StringBuffer(); |
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63 | while (current > -1) { |
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64 | buffer.append(text.substring(previous, current)); |
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65 | buffer.append(s); |
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66 | previous= current + 1; |
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67 | current= text.indexOf(c, previous); |
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68 | } |
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69 | buffer.append(text.substring(previous)); |
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70 | |
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71 | return buffer.toString(); |
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72 | } |
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73 | |
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74 | public static String convertToHTMLContent(String content) { |
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75 | content= replace(content, '&', "&"); //$NON-NLS-1$ |
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76 | content= replace(content, '"', """); //$NON-NLS-1$ |
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77 | content= replace(content, '<', "<"); //$NON-NLS-1$ |
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78 | return replace(content, '>', ">"); //$NON-NLS-1$ |
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79 | } |
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80 | |
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81 | public static String read(Reader rd) { |
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82 | |
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83 | StringBuffer buffer= new StringBuffer(); |
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84 | char[] readBuffer= new char[2048]; |
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85 | |
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86 | try { |
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87 | int n= rd.read(readBuffer); |
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88 | while (n > 0) { |
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89 | buffer.append(readBuffer, 0, n); |
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90 | n= rd.read(readBuffer); |
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91 | } |
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92 | return buffer.toString(); |
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93 | } catch (IOException x) { |
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94 | } |
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95 | |
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96 | return null; |
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97 | } |
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98 | |
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99 | public static void insertPageProlog(StringBuffer buffer, int position, RGB bgRGB, URL styleSheetURL) { |
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100 | |
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101 | if (bgRGB == null) |
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102 | insertPageProlog(buffer, position, styleSheetURL); |
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103 | else { |
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104 | StringBuffer pageProlog= new StringBuffer(300); |
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105 | |
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106 | pageProlog.append("<html>"); //$NON-NLS-1$ |
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107 | |
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108 | appendStyleSheetURL(pageProlog, styleSheetURL); |
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109 | |
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110 | pageProlog.append("<body text=\"#000000\" bgcolor=\""); //$NON-NLS-1$ |
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111 | appendColor(pageProlog, bgRGB); |
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112 | pageProlog.append("\">"); //$NON-NLS-1$ |
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113 | |
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114 | buffer.insert(position, pageProlog.toString()); |
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115 | } |
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116 | } |
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117 | public static void insertPageProlog(StringBuffer buffer, int position, RGB bgRGB, String styleSheet) { |
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118 | |
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119 | if (bgRGB == null) |
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120 | insertPageProlog(buffer, position, styleSheet); |
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121 | else { |
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122 | StringBuffer pageProlog= new StringBuffer(300); |
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123 | |
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124 | pageProlog.append("<html>"); //$NON-NLS-1$ |
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125 | |
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126 | appendStyleSheetURL(pageProlog, styleSheet); |
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127 | |
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128 | pageProlog.append("<body text=\"#000000\" bgcolor=\""); //$NON-NLS-1$ |
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129 | appendColor(pageProlog, bgRGB); |
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130 | pageProlog.append("\">"); //$NON-NLS-1$ |
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131 | |
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132 | buffer.insert(position, pageProlog.toString()); |
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133 | } |
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134 | } |
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135 | |
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136 | public static void insertStyles(StringBuffer buffer, String[] styles) { |
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137 | if (styles == null || styles.length == 0) |
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138 | return; |
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139 | |
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140 | StringBuffer styleBuf= new StringBuffer(10 * styles.length); |
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141 | for (int i= 0; styles != null && i < styles.length; i++) { |
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142 | styleBuf.append(" style=\""); //$NON-NLS-1$ |
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143 | styleBuf.append(styles[i]); |
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144 | styleBuf.append('"'); |
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145 | } |
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146 | |
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147 | // Find insertion index |
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148 | int index= buffer.indexOf("<body "); //$NON-NLS-1$ |
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149 | if (index == -1) |
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150 | return; |
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151 | |
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152 | buffer.insert(index+5, styleBuf); |
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153 | } |
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154 | |
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155 | public static void insertPageProlog(StringBuffer buffer, int position, RGB bgRGB) { |
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156 | if (bgRGB == null) |
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157 | insertPageProlog(buffer, position); |
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158 | else { |
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159 | StringBuffer pageProlog= new StringBuffer(60); |
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160 | pageProlog.append("<html><body text=\"#000000\" bgcolor=\""); //$NON-NLS-1$ |
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161 | appendColor(pageProlog, bgRGB); |
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162 | pageProlog.append("\">"); //$NON-NLS-1$ |
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163 | buffer.insert(position, pageProlog.toString()); |
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164 | } |
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165 | } |
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166 | |
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167 | private static void appendStyleSheetURL(StringBuffer buffer, String styleSheet) { |
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168 | if (styleSheet == null) |
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169 | return; |
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170 | |
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171 | buffer.append("<head><style CHARSET=\"ISO-8859-1\" TYPE=\"text/css\">"); //$NON-NLS-1$ |
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172 | buffer.append(styleSheet); |
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173 | buffer.append("</style></head>"); //$NON-NLS-1$ |
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174 | } |
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175 | |
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176 | private static void appendStyleSheetURL(StringBuffer buffer, URL styleSheetURL) { |
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177 | if (styleSheetURL == null) |
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178 | return; |
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179 | |
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180 | buffer.append("<head>"); //$NON-NLS-1$ |
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181 | |
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182 | buffer.append("<LINK REL=\"stylesheet\" HREF= \""); //$NON-NLS-1$ |
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183 | buffer.append(styleSheetURL); |
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184 | buffer.append("\" CHARSET=\"ISO-8859-1\" TYPE=\"text/css\">"); //$NON-NLS-1$ |
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185 | |
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186 | buffer.append("</head>"); //$NON-NLS-1$ |
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187 | } |
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188 | |
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189 | private static void appendColor(StringBuffer buffer, RGB rgb) { |
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190 | buffer.append('#'); |
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191 | buffer.append(Integer.toHexString(rgb.red)); |
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192 | buffer.append(Integer.toHexString(rgb.green)); |
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193 | buffer.append(Integer.toHexString(rgb.blue)); |
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194 | } |
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195 | |
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196 | public static void insertPageProlog(StringBuffer buffer, int position) { |
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197 | insertPageProlog(buffer, position, getBgColor()); |
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198 | } |
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199 | |
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200 | public static void insertPageProlog(StringBuffer buffer, int position, URL styleSheetURL) { |
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201 | insertPageProlog(buffer, position, getBgColor(), styleSheetURL); |
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202 | } |
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203 | |
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204 | public static void insertPageProlog(StringBuffer buffer, int position, String styleSheet) { |
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205 | insertPageProlog(buffer, position, getBgColor(), styleSheet); |
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206 | } |
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207 | |
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208 | private static RGB getBgColor() { |
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209 | if (BG_COLOR_RGB != null) |
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210 | return BG_COLOR_RGB; |
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211 | return new RGB(255,255, 225); // RGB value of info bg color on WindowsXP |
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212 | |
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213 | } |
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214 | |
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215 | public static void addPageProlog(StringBuffer buffer) { |
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216 | insertPageProlog(buffer, buffer.length()); |
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217 | } |
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218 | |
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219 | public static void addPageEpilog(StringBuffer buffer) { |
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220 | buffer.append("</font></body></html>"); //$NON-NLS-1$ |
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221 | } |
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222 | |
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223 | public static void startBulletList(StringBuffer buffer) { |
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224 | buffer.append("<ul>"); //$NON-NLS-1$ |
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225 | } |
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226 | |
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227 | public static void endBulletList(StringBuffer buffer) { |
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228 | buffer.append("</ul>"); //$NON-NLS-1$ |
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229 | } |
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230 | |
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231 | public static void addBullet(StringBuffer buffer, String bullet) { |
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232 | if (bullet != null) { |
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233 | buffer.append("<li>"); //$NON-NLS-1$ |
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234 | buffer.append(bullet); |
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235 | buffer.append("</li>"); //$NON-NLS-1$ |
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236 | } |
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237 | } |
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238 | |
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239 | public static void addSmallHeader(StringBuffer buffer, String header) { |
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240 | if (header != null) { |
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241 | buffer.append("<h5>"); //$NON-NLS-1$ |
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242 | buffer.append(header); |
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243 | buffer.append("</h5>"); //$NON-NLS-1$ |
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244 | } |
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245 | } |
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246 | |
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247 | public static void addParagraph(StringBuffer buffer, String paragraph) { |
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248 | if (paragraph != null) { |
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249 | buffer.append("<p>"); //$NON-NLS-1$ |
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250 | buffer.append(paragraph); |
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251 | } |
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252 | } |
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253 | |
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254 | public static void addParagraph(StringBuffer buffer, Reader paragraphReader) { |
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255 | if (paragraphReader != null) |
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256 | addParagraph(buffer, read(paragraphReader)); |
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257 | } |
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258 | } |
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