1 // Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
5 import java.util.zip.*;
12 * Encapsulates a template node (the <template/> element of a
13 * .xwt file, or any child element thereof).
15 * Note that the Template instance corresponding to the
16 * <template/> node carries all the header information -- hence
17 * some of the instance members are not meaningful on non-root
18 * Template instances. We refer to these non-root instances as
19 * <i>anonymous templates</i>.
21 * See the XWT reference for information on the order in which
22 * templates are applied, attributes are put, and scripts are run.
24 public class Template {
26 // Instance Members ///////////////////////////////////////////////////////
28 String id = null; ///< the id of this box
29 String redirect = null; ///< the id of the redirect target; only meaningful on a root node
30 private String[] keys; ///< keys to be "put" to instances of this template; elements correspond to those of vals
31 private Object[] vals; ///< values to be "put" to instances of this template; elements correspond to those of keys
32 private Vec children = new Vec(); ///< during XML parsing, this holds the list of currently-parsed children; null otherwise
33 private int numunits = -1; ///< see numUnits(); -1 means that this value has not yet been computed
35 private JSFunction script = null; ///< the script on this node
36 private String fileName = "unknown"; ///< the filename this node came from; used only for debugging
37 private Vec preapply = new Vec(); ///< templates that should be preapplied (in the order of application)
40 // Instance Members that are only meaningful on root Template //////////////////////////////////////
42 private JSScope staticJSScope = null; ///< the scope in which the static block is executed
43 private JSFunction staticscript = null; ///< the script on the static node of this template, null already performed
46 // Only used during parsing /////////////////////////////////////////////////////////////////
48 private StringBuffer content = null; ///< during XML parsing, this holds partially-read character data; null otherwise
49 private int content_start = 0; ///< line number of the first line of <tt>content</tt>
50 private int content_lines = 0; ///< number of lines in <tt>content</tt>
51 private int startLine = -1; ///< the line number that this element starts on
52 private final Res r; ///< the resource we came from
55 // Static data/methods ///////////////////////////////////////////////////////////////////
57 public static Template getTemplate(Res r) {
59 r = r.addExtension(".xwt");
60 if (r.t != null) return r.t;
61 r.t = new Template(r);
62 new TemplateHelper().parseit(r.getInputStream(), r.t);
64 } catch (Exception e) {
65 if (Log.on) Log.log(r.t == null ? "null" : r.t.fileName, e);
70 public static Res resolveStringToResource(String str, XWT xwt, boolean permitAbsolute) {
72 if (str.indexOf("://") != -1) {
74 //if (permitAbsolute) return Res.fromString(str);
75 Log.log(Template.class, "absolute URL " + str + " not permitted here");
81 while(str.indexOf('.') != -1) {
82 String path = str.substring(0, str.indexOf('.'));
83 str = str.substring(str.indexOf('.') + 1);
84 ret = (Res)ret.get(path);
86 ret = (Res)ret.get(str);
91 // Methods to apply templates ////////////////////////////////////////////////////////
93 private Template(Res r) { this.r = r; }
95 /** called before this template is applied or its static object can be externally referenced */
97 if (staticJSScope == null) staticJSScope = new JSScope(null);
98 if (staticscript == null) return staticJSScope;
99 JSFunction temp = staticscript;
101 temp.cloneWithNewParentScope(staticJSScope).call(null, null, null, null, 0);
102 return staticJSScope;
105 /** Applies the template to Box b
106 * @param pboxes a vector of all box parents on which to put $-references
107 * @param ptemplates a vector of the fileNames to recieve private references on the pboxes
109 void apply(Box b, XWT xwt) { apply(b, xwt, null); }
110 void apply(Box b, XWT xwt, PerInstantiationJSScope parentPis) {
114 if (id != null) parentPis.putDollar(id, b);
115 for(int i=0; i<preapply.size(); i++) {
116 Template t = getTemplate(resolveStringToResource((String)preapply.elementAt(i), xwt, false));
117 if (t == null) throw new RuntimeException("unable to resolve resource " + preapply.elementAt(i));
121 PerInstantiationJSScope pis = new PerInstantiationJSScope(b, xwt, parentPis, staticJSScope);
122 for (int i=0; children != null && i<children.size(); i++) {
124 ((Template)children.elementAt(i)).apply(kid, xwt, pis);
125 b.putAndTriggerTraps(JS.N(b.numchildren), kid);
128 if (script != null) script.cloneWithNewParentScope(pis).call(null, null, null, null, 0);
130 for(int i=0; keys != null && i<keys.length; i++)
131 if (vals[i] instanceof String && ((String)vals[i]).charAt(0) == '$') b.putAndTriggerTraps(keys[i], pis.get(vals[i]));
132 else if ("image".equals(keys[i])) b.putAndTriggerTraps("image", resolveStringToResource((String)vals[i], xwt, true));
133 else if (keys[i] != null) b.putAndTriggerTraps(keys[i], vals[i]);
138 // XML Parsing /////////////////////////////////////////////////////////////////
140 /** handles XML parsing; builds a Template tree as it goes */
141 static final class TemplateHelper extends XML {
146 private static final int STATE_INITIAL = 0;
147 private static final int STATE_IN_XWT_NODE = 1;
148 private static final int STATE_IN_TEMPLATE_NODE = 2;
149 private static final int STATE_FINISHED_TEMPLATE_NODE = 3;
151 private String nameOfHeaderNodeBeingProcessed;
153 Vec nodeStack = new Vec(); ///< stack of Templates whose XML elements we have seen open-tags for but not close-tags
154 Template t = null; ///< the template we're currently working on
156 /** parse an XML input stream, building a Template tree off of <tt>root</tt> */
157 void parseit(InputStream is, Template root) throws XML.XMLException, IOException {
158 state = STATE_INITIAL;
159 nameOfHeaderNodeBeingProcessed = null;
160 nodeStack.setSize(0);
162 parse(new InputStreamReader(is));
165 public void startElement(XML.Element c) throws XML.SchemaException {
168 if (!"xwt".equals(c.localName)) throw new XML.SchemaException("root element was not <xwt>");
169 if (c.len != 0) throw new XML.SchemaException("root element must not have attributes");
170 state = STATE_IN_XWT_NODE;
173 case STATE_IN_XWT_NODE:
174 if (nameOfHeaderNodeBeingProcessed != null) throw new XML.SchemaException("can't nest header nodes");
175 nameOfHeaderNodeBeingProcessed = c.localName;
176 if (c.localName.equals("doc")) {
178 } else if (c.localName.equals("static")) {
179 if (t.staticscript != null)
180 throw new XML.SchemaException("the <static> header node may not appear more than once");
182 throw new XML.SchemaException("the <static> node may not have attributes");
183 } else if (c.localName.equals("template")) {
184 t.startLine = getLine();
185 state = STATE_IN_TEMPLATE_NODE;
186 processBodyElement(c);
188 throw new XML.SchemaException("unrecognized header node \"" + c.localName + "\"");
192 case STATE_IN_TEMPLATE_NODE:
193 // push the last node we were in onto the stack
194 nodeStack.addElement(t);
195 // instantiate a new node, and set its fileName/importlist/preapply
196 Template t2 = new Template(t.r);
197 t2.startLine = getLine();
198 if (!c.localName.equals("box") && !c.localName.equals("template"))
199 t2.preapply.addElement((c.uri == null ? "" : (c.uri + ".")) + c.localName);
200 // make the new node the current node
202 processBodyElement(c);
205 case STATE_FINISHED_TEMPLATE_NODE:
206 throw new XML.SchemaException("no elements may appear after the <template> node");
210 private void processBodyElement(XML.Element c) {
211 Hash h = new Hash(c.len * 2, 3);
212 for(int i=0; i<c.len; i++) {
213 if (c.keys[i] == null) continue;
214 if (c.keys[i].equals("fill") || c.keys[i].equals("font")) c.vals[i] = c.uris[i] + "." + c.vals[i];
215 if (c.keys[i].equals("preapply")) {
216 String uri = c.uris[i];
217 StringTokenizer tok = new StringTokenizer(c.vals[i].toString(), " ");
218 while(tok.hasMoreTokens()) t.preapply.addElement(uri + tok.nextToken());
219 c.keys[i] = c.keys[c.keys.length - 1];
220 c.vals[i] = c.vals[c.vals.length - 1];
224 h.put(c.keys[i], c.vals[i]);
226 t.keys = new String[h.size()];
227 t.vals = new Object[h.size()];
229 Vec v = new Vec(h.size(), c.keys);
230 v.sort(new Vec.CompareFunc() { public int compare(Object a, Object b) { return ((String)a).compareTo((String)b); } });
231 for(int i=0; i<h.size(); i++) {
232 if (c.keys[i].equals("thisbox")) {
233 for(int j=i; j>0; j--) { t.keys[j] = t.keys[j - 1]; t.vals[j] = t.vals[j - 1]; }
234 t.keys[0] = (String)v.elementAt(i);
235 t.vals[0] = h.get(t.keys[0]);
237 t.keys[i] = (String)v.elementAt(i);
238 t.vals[i] = h.get(t.keys[i]);
242 for(int i=0; i<t.keys.length; i++) {
243 if (t.keys[i].equals("id")) {
244 t.id = t.vals[i].toString().intern();
249 t.keys[i] = t.keys[i].intern();
251 String valString = t.vals[i].toString();
253 if (valString.equals("true")) t.vals[i] = Boolean.TRUE;
254 else if (valString.equals("false")) t.vals[i] = Boolean.FALSE;
255 else if (valString.equals("null")) t.vals[i] = null;
257 boolean hasNonNumeral = false;
258 boolean periodUsed = false;
259 for(int j=0; j<valString.length(); j++)
260 if (j == 0 && valString.charAt(j) == '-') {
261 } else if (valString.charAt(j) == '.' && !periodUsed && j != valString.length() - 1) {
263 } else if (!Character.isDigit(valString.charAt(j))) {
264 hasNonNumeral = true;
267 if (valString.length() > 0 && !hasNonNumeral) t.vals[i] = new Double(valString);
268 else t.vals[i] = valString.intern();
273 private JSFunction parseScript(boolean isstatic) {
274 JSFunction thisscript = null;
276 String contentString = t.content.toString();
277 if (contentString.trim().length() > 0)
278 thisscript = JSFunction.fromReader(t.fileName + (isstatic ? "._" : ""),
280 new StringReader(contentString));
281 } catch (IOException ioe) {
282 if (Log.on) Log.log(this, " ERROR: " + ioe.getMessage());
291 public void endElement(XML.Element c) throws XML.SchemaException {
292 if (state == STATE_IN_XWT_NODE) {
293 if ("static".equals(nameOfHeaderNodeBeingProcessed) && t.content != null) t.staticscript = parseScript(true);
294 nameOfHeaderNodeBeingProcessed = null;
296 } else if (state == STATE_IN_TEMPLATE_NODE) {
297 if (t.content != null) t.script = parseScript(false);
298 if (nodeStack.size() == 0) {
300 state = STATE_FINISHED_TEMPLATE_NODE;
303 // add this template as a child of its parent
305 t = (Template)nodeStack.lastElement();
306 nodeStack.setSize(nodeStack.size() - 1);
307 t.children.addElement(oldt);
312 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
313 // invoke the no-tab crusade
314 for (int i=0; length >i; i++) if (ch[start+i] == '\t') throw new XML.SchemaException(
315 t.fileName+ ":" + getLine() + "," + getCol() + ": tabs are not allowed in XWT files");
317 if ("static".equals(nameOfHeaderNodeBeingProcessed) || state == STATE_IN_TEMPLATE_NODE) {
318 if (t.content == null) {
319 t.content_start = getLine();
321 t.content = new StringBuffer();
324 t.content.append(ch, start, length);
327 } else if (nameOfHeaderNodeBeingProcessed != null && state != STATE_FINISHED_TEMPLATE_NODE) {
328 throw new XML.SchemaException("header node <" + nameOfHeaderNodeBeingProcessed + "> cannot have text content");
332 public void whitespace(char[] ch, int start, int length) throws XML.SchemaException { }
335 private static class PerInstantiationJSScope extends JSScope {
337 PerInstantiationJSScope parentBoxPis = null;
338 JSScope myStatic = null;
339 void putDollar(String key, Box target) {
340 if (parentBoxPis != null) parentBoxPis.putDollar(key, target);
342 put("$" + key, target);
344 public PerInstantiationJSScope(JSScope parentScope, XWT xwt, PerInstantiationJSScope parentBoxPis, JSScope myStatic) {
346 this.parentBoxPis = parentBoxPis;
348 this.myStatic = myStatic;
350 public Object get(Object key) {
351 if (super.has(key)) return super.get(key);
352 if (key.equals("xwt")) return xwt;
353 if (key.equals("static")) return myStatic;
354 return super.get(key);
356 public void put(Object key, Object val) {
357 if (super.has(key)) super.put(key, val);
358 else super.put(key, val);