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1
5 package org.h2.server.web;
6
7 import java.util.ArrayList  ;
8 import java.util.HashMap ;
9
10 public class PageParser {
11 private WebServer server;
12 private String page;
13 private int pos;
14 private HashMap settings;
15 private int len;
16 private StringBuffer result;
17
18 public static String parse(WebServer server, String page, HashMap settings) {
19 PageParser block = new PageParser(server, page, settings, 0);
20 return block.parse();
21 }
22
23 private PageParser(WebServer server, String page, HashMap settings, int pos) {
24 this.server = server;
25 this.page = page;
26 this.pos = pos;
27 this.len = page.length();
28 this.settings = settings;
29 result = new StringBuffer (len);
30 }
31
32 private void setError(int i) {
33 String s = page.substring(0, i) + "####BUG####" + page.substring(i);
34 s = PageParser.escapeHtml(s);
35 result = new StringBuffer (s);
36 }
37
38 private String parseBlockUntil(String end) throws Exception {
39 PageParser block = new PageParser(server, page, settings, pos);
40 block.parseAll();
41 if (!block.readIf(end)) {
42 throw new Exception ();
43 }
44 pos = block.pos;
45 return block.result.toString();
46 }
47
48 public String parse() {
49 try {
50 parseAll();
51 if (pos != len) {
52 setError(pos);
53 }
54 } catch (Exception e) {
55 setError(pos);
57 }
58 return result.toString();
59 }
60
61 private void parseAll() throws Exception {
62 StringBuffer buff = result;
63 String p = page;
64 int i = pos;
65 for (; i < len; i++) {
66 char c = p.charAt(i);
67 switch (c) {
68 case '<': {
69 if (p.charAt(i + 1) == '%') {
70 if (p.charAt(i + 2) == '@') {
71 i += 3;
72 pos = i;
73 read("include");
74 String file = readParam("file");
75 read("%>");
76 String s = server.getTextFile(file);
77 append(s);
78 i = pos;
79 } else {
80 setError(i);
81 return;
82 }
83 break;
84 } else if (p.charAt(i + 3) == ':' && p.charAt(i + 1) == '/') {
85 pos = i;
87 return;
88 } else if (p.charAt(i + 2) == ':') {
89 pos = i;
90 if (readIf("<c:forEach")) {
91 String var = readParam("var");
92 String items = readParam("items");
93 read(">");
94 int start = pos;
95 ArrayList list = (ArrayList ) get(items);
96 if (list == null) {
97 result.append("?items?");
98 list = new ArrayList ();
99 }
100 if (list.size() == 0) {
101 parseBlockUntil("</c:forEach>");
102 }
103 for (int j = 0; j < list.size(); j++) {
104 settings.put(var, list.get(j));
105 pos = start;
106 String block = parseBlockUntil("</c:forEach>");
107 result.append(block);
108 }
109 } else if (readIf("<c:if")) {
110 String test = readParam("test");
111 int eq = test.indexOf("=='");
112 if (eq < 0) {
113 setError(i);
114 return;
115 }
116 String val = test.substring(eq + 3, test.length() - 1);
117 test = test.substring(0, eq);
118 String value = (String ) get(test);
119 read(">");
120 String block = parseBlockUntil("</c:if>");
121 pos--;
122 if (value.equals(val)) {
123 result.append(block);
124 }
125 } else {
126 setError(i);
127 return;
128 }
129 i = pos;
130 } else {
131 buff.append(c);
132 }
133 break;
134 }
135 case '$':
136 if (p.charAt(i + 1) == '{') {
137 i += 2;
138 int j = p.indexOf('}', i);
139 if (j < 0) {
140 setError(i);
141 return;
142 }
143 String item = p.substring(i, j).trim();
144 i = j;
145 String s = (String ) get(item);
146 append(s);
147 }
148 break;
149 default:
150 buff.append(c);
151 }
152 }
153 pos = i;
154 }
155
156 private Object get(String item) {
157 int dot = item.indexOf('.');
158 if (dot >= 0) {
159 String sub = item.substring(dot + 1);
160 item = item.substring(0, dot);
161 HashMap map = (HashMap ) settings.get(item);
162 if (map == null) {
163 return "?" + item + "?";
164 }
165 return map.get(sub);
166 } else {
167 return settings.get(item);
168 }
169 }
170
171 private void append(String s) {
172 if (s != null) {
173 result.append(PageParser.parse(server, s, settings));
174 }
175 }
176
177 private String readParam(String name) throws Exception {
178 read(name);
179 read("=");
180 read("\"");
181 int start = pos;
182 while (page.charAt(pos) != '"') {
183 pos++;
184 }
185 int end = pos;
186 read("\"");
187 String s = page.substring(start, end);
188 return PageParser.parse(server, s, settings);
189 }
190
191 private void skipSpaces() {
192 while (page.charAt(pos) == ' ') {
193 pos++;
194 }
195 }
196
197 private void read(String s) throws Exception {
198 if (!readIf(s)) {
199 throw new Exception ();
200 }
201 }
202
203 private boolean readIf(String s) {
204 skipSpaces();
205 if (page.regionMatches(pos, s, 0, s.length())) {
206 pos += s.length();
207 skipSpaces();
208 return true;
209 }
210 return false;
211 }
212
213 public static String escapeHtmlNoBreak(String s) {
214 return escapeHtml(s, false);
215 }
216
217 public static String escapeHtml(String s) {
218 return escapeHtml(s, true);
219 }
220
221 public static String escapeHtml(String s, boolean convertBreak) {
222 if (s == null) {
223 return null;
224 }
225 if (s.length() == 0) {
226 return " ";
227 }
228 StringBuffer buff = new StringBuffer (s.length());
229 boolean leadingSpace = true;
230 for (int i = 0; i < s.length(); i++) {
231 char c = s.charAt(i);
232 if (leadingSpace) {
233 if (c == ' ') {
234 buff.append(" ");
235 continue;
236 } else {
237 leadingSpace = false;
238 }
239 }
240 switch (c) {
241 case '$':
242 buff.append("$");
244 break;
245 case '<':
246 buff.append("<");
247 break;
248 case '>':
249 buff.append(">");
250 break;
251 case '&':
252 buff.append("&");
253 break;
254 case '"':
255 buff.append(""");
256 break;
257 case '\'':
258 buff.append("'");
259 break;
260 case '\n':
261 if (convertBreak) {
262 buff.append("<br>");
263 leadingSpace = true;
264 } else {
265 buff.append(c);
266 }
267 break;
268 default:
269 if (c >= 128) {
270 buff.append("&#");
271 buff.append((int) c);
272 buff.append(';');
273 } else {
274 buff.append(c);
275 }
276 }
277 }
278 return buff.toString();
279 }
280
281 public static String escapeJavaScript(String s) {
282 if (s == null) {
283 return null;
284 }
285 if (s.length() == 0) {
286 return "";
287 }
288 StringBuffer buff = new StringBuffer (s.length());
289 for (int i = 0; i < s.length(); i++) {
290 char c = s.charAt(i);
291 switch (c) {
292 case '"':
293 buff.append("\\\"");
294 break;
295 case '\'':
296 buff.append("\\'");
297 break;
298 case '\\':
299 buff.append("\\\\");
300 break;
301 case '\n':
302 buff.append("\\n");
303 break;
304 case '\r':
305 buff.append("\\r");
306 break;
307 case '\t':
308 buff.append("\\t");
309 break;
310 default:
311 buff.append(c);
312 }
313 }
314 return buff.toString();
315 }
317 }
318 |
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