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 JS.CompiledFunction 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; ///< templates that should be preapplied (in the order of application)
40 // Instance Members that are only meaningful on root Template //////////////////////////////////////
42 private JS.Scope staticScope = null; ///< the scope in which the static block is executed
43 private JS.CompiledFunction 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 final Res r; ///< the resource we came from
55 // Static data/methods ///////////////////////////////////////////////////////////////////
57 public static Template getTemplate(Res r) {
59 if (r.t != null) return r.t;
60 r.t = new Template(r);
61 new TemplateHelper().parseit(r.getInputStream(), r.t);
63 } catch (Exception e) {
64 if (Log.on) Log.log(r.t.fileName, e);
69 public static Res resolveStringToResource(String str, XWT xwt, boolean permitAbsolute) {
71 if (str.indexOf("://") != -1) {
72 if (permitAbsolute) return str;
73 Log.log("absolute URL " + str + " not permitted here");
79 while(str.indexOf('.') != -1) {
80 String path = str.substring(0, str.indexOf('.'));
81 str = str.substring(str.indexOf('.') + 1);
82 ret = (Res)ret.get(path);
84 ret = (Res)ret.get(str);
89 // Methods to apply templates ////////////////////////////////////////////////////////
91 private Template() { this.r = r; }
93 /** called before this template is applied or its static object can be externally referenced */
94 JS.Scope getStatic() {
95 if (staticScope == null) staticScope = new JS.Scope(null);
96 if (staticscript == null) return staticScope;
97 JS.CompiledFunction temp = staticscript;
99 temp.call(new JS.Array(), staticScope);
103 /** Applies the template to Box b
104 * @param pboxes a vector of all box parents on which to put $-references
105 * @param ptemplates a vector of the fileNames to recieve private references on the pboxes
107 void apply(Box b, JS.Callable c, XWT xwt) { apply(b, c, xwt, null); }
108 void apply(Box b, JS.Callable callback, XWT xwt, PerInstantiationScope parentPis) {
112 if (id != null) parentPis.putDollar(id, this);
113 for(int i=0; i<preapply.size(); i++) {
114 Template t = getTemplate(resolveStringToResource((String)preapply.elementAt(i), xwt));
115 if (t == null) throw new RuntimeException("unable to resolve resource " + preapply.elementAt(i));
116 t.apply(b, callback, numerator, denominator, xwt);
119 PerInstantiationScope pis = new PerInstantiationScope(b, xwt, parentPis);
120 for (int i=0; children != null && i<children.length; i++) {
122 getTemplate(resolveStringToResource((String)children.elementAt(i), xwt)).apply(kid, callback, xwt, pis);
123 b.put(b.numChildren(), kid);
126 if (script != null) script.call(new JS.Array(), pis);
128 for(int i=0; keys != null && i<keys.length; i++)
129 if (vals[i] instanceof String && ((String)vals[i]).charAt(0) == '$') b.put(keys[i], pis.get(vals[i]));
130 else b.put(keys[i], vals[i]);
135 // XML Parsing /////////////////////////////////////////////////////////////////
137 /** handles XML parsing; builds a Template tree as it goes */
138 static final class TemplateHelper extends XML {
143 private static final int STATE_INITIAL = 0;
144 private static final int STATE_IN_XWT_NODE = 1;
145 private static final int STATE_IN_TEMPLATE_NODE = 2;
146 private static final int STATE_FINISHED_TEMPLATE_NODE = 3;
148 private String nameOfHeaderNodeBeingProcessed;
150 Vec nodeStack = new Vec(); ///< stack of Templates whose XML elements we have seen open-tags for but not close-tags
151 Template t = null; ///< the template we're currently working on
153 /** parse an XML input stream, building a Template tree off of <tt>root</tt> */
154 void parseit(InputStream is, Template root) throws XML.XMLException, IOException {
155 state = STATE_INITIAL;
156 nameOfHeaderNodeBeingProcessed = null;
157 nodeStack.setSize(0);
159 parse(new InputStreamReader(is));
162 public void startElement(XML.Element c) throws XML.SchemaException {
165 if (!"xwt".equals(c.localName)) throw new XML.SchemaException("root element was not <xwt>");
166 if (c.len != 0) throw new XML.SchemaException("root element must not have attributes");
167 state = STATE_IN_XWT_NODE
170 case STATE_IN_XWT_NODE:
171 if (nameOfHeaderNodeBeingProcessed != null) throw new XML.SchemaException("can't nest header nodes");
172 nameOfHeaderNodeBeingProcessed = c.localName;
173 if (c.localName.equals("doc")) {
175 } else if (c.localName.equals("static")) {
176 if (staticscript != null)
177 throw new XML.SchemaException("the <static> header node may not appear more than once");
179 throw new XML.SchemaException("the <static> node may not have attributes");
180 } else if (c.localName.equals("template")) {
181 t.startLine = getLine();
182 state = STATE_IN_TEMPLATE_NODE;
184 throw new XML.SchemaException("unrecognized header node \"" + c.localName + "\"");
188 case STATE_IN_TEMPLATE_NODE:
189 processBodyElement(c);
192 case STATE_FINISHED_TEMPLATE_NODE:
193 throw new XML.SchemaException("no elements may appear after the <template> node");
197 private void processBodyElement(XML.Element c) {
198 // push the last node we were in onto the stack
199 nodeStack.addElement(t);
201 // instantiate a new node, and set its fileName/importlist/preapply
202 Template t2 = new Template(t.fileName);
203 t2.startLine = getLine();
204 if (!c.localName.equals("box"))
205 t2.preapply.addElement((c.uri == null ? "" : (c.uri + ".")) + c.localName);
206 // make the new node the current node
209 t.keys = new String[c.len];
210 t.vals = new Object[c.len];
211 Hash h = new Hash(c.len * 2, 3);
212 for(int i=0; i<c.len; i++) {
213 if (c.keys[i].endsWith(":image")) {
214 String uri = c.urimap.get(c.keys[i].substring(0, c.keys[i].indexOf(':')));
215 c.keys[i] = c.keys[i].substring(c.keys[i].lastIndexOf(':') + 1);
216 c.vals[i] = uri + "." + c.vals[i];
218 if ((c.keys[i].equals("preapply") || c.keys[i].endsWith(":preapply")) && c.localName.equals("template")) {
220 if (c.keys[i].endsWith(":preapply")) {
221 uri = "." + c.urimap.get(c.keys[i].substring(0, c.keys[i].indexOf(':')));
222 c.keys[i] = c.keys[i].substring(c.keys[i].lastIndexOf(':') + 1);
224 StringTokenizer tok = new StringTokenizer(c.vals[i].toString(), " ");
225 while(tok.hasMoreTokens()) t.preapply.addElement(uri + tok.nextToken());
228 h.put(c.keys[i], c.vals[i]);
231 Vec v = new Vec(h.size(), c.keys);
232 v.sort(new Vec.CompareFunc() { public int compare(Object a, Object b) { return ((String)a).compareTo((String)b); } });
233 for(int i=0; i<h.size(); i++) {
234 if (t.keys[i].equals("thisbox")) {
235 for(int j=i; j>0; j--) { t.keys[j] = t.keys[j - 1]; t.vals[j] = t.vals[j - 1]; }
236 t.keys[0] = (String)v.elementAt(i);
237 t.vals[0] = h.get(t.keys[i]);
239 t.keys[i] = (String)v.elementAt(i);
240 t.vals[i] = h.get(t.keys[i]);
244 for(int i=0; i<t.keys.length; i++) {
245 if (t.keys[i].equals("id")) {
246 t.id = t.vals[i].toString().intern();
251 t.keys[i] = t.keys[i].intern();
253 String valString = t.vals[i].toString();
255 if (valString.equals("true")) t.vals[i] = Boolean.TRUE;
256 else if (valString.equals("false")) t.vals[i] = Boolean.FALSE;
257 else if (valString.equals("null")) t.vals[i] = null;
259 boolean hasNonNumeral = false;
260 boolean periodUsed = false;
261 for(int j=0; j<valString.length(); j++)
262 if (j == 0 && valString.charAt(j) == '-') {
263 } else if (valString.charAt(j) == '.' && !periodUsed && j != valString.length() - 1) {
265 } else if (!Character.isDigit(valString.charAt(j))) {
266 hasNonNumeral = true;
269 if (valString.length() > 0 && !hasNonNumeral) t.vals[i] = new Double(valString);
270 else t.vals[i] = valString.intern();
275 private JS.CompiledFunction parseScript(boolean isstatic) {
276 JS.CompiledFunction thisscript = null;
278 thisscript = JS.parse(t.fileName + (isstatic ? "._" : ""), t.content_start, new StringReader(t.content.toString()));
279 } catch (IOException ioe) {
280 if (Log.on) Log.log(this, " ERROR: " + ioe.getMessage());
289 public void endElement(XML.Element c) throws XML.SchemaException {
290 if (state == STATE_IN_XWT_NODE) {
291 if ("static".equals(nameOfHeaderNodeBeingProcessed) && t.content != null) t.staticscript = parseScript(true);
292 nameOfHeaderNodeBeingProcessed = null;
294 } else if (state == STATE_IN_TEMPLATE_NODE) {
295 if (t.content != null) t.script = parseScript(false);
296 if (nodeStack.size() == 0) {
298 state = STATE_FINISHED_TEMPLATE_NODE;
301 // add this template as a child of its parent
303 t = (Template)nodeStack.lastElement();
304 nodeStack.setSize(nodeStack.size() - 1);
305 t.children.addElement(oldt);
310 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
311 // invoke the no-tab crusade
312 for (int i=0; length >i; i++) if (ch[start+i] == '\t') throw new XML.SchemaException(
313 t.fileName+ ":" + getLine() + "," + getCol() + ": tabs are not allowed in XWT files");
315 if ("static".equals(nameOfHeaderNodeBeingProcessed) || state == STATE_IN_TEMPLATE_NODE) {
316 if (t.content == null) {
317 t.content_start = getLine();
319 t.content = new StringBuffer();
322 t.content.append(ch, start, length);
325 } else if (nameOfHeaderNodeBeingProcessed != null) {
326 throw new XML.SchemaException("header node <" + nameOfHeaderNodeBeingProcessed + "> cannot have text content");
330 public void whitespace(char[] ch, int start, int length) throws XML.SchemaException { }
333 private static class PerInstantiationScope extends JS.Scope {
335 PerInstantiationScope parentBoxPis = null;
336 void putDollar(String key, Box target) {
337 if (parentBoxPis != null) parentBoxPis.putDollar(key, target);
339 put("$" + key, target);
341 public PerInstantiationScope(Scope parentScope, XWT xwt, PerInstantiationScope parentBoxPis) {
343 this.parentBoxPis = parentBoxPis;
346 public boolean isTransparent() { return true; }
347 public boolean has(Object key) { return false; }
348 public void declare(String s) { super.declare(s); }
349 public Object get(Object key) {
350 if (key.equals("xwt")) return xwt;
351 if (Box.SpecialBoxProperty.specialBoxProperties.get(key) != null) return parentScope.get(key);
352 if (super.has(key)) return super.get(key);
353 Object ret = xwt.rr.get(key);
354 if (ret != null) return ret;
355 throw new JS.Exn("must declare " + key + " before using it!");
357 public void put(Object key, Object val) {
358 if (Box.SpecialBoxProperty.specialBoxProperties.get(key) == null) parentScope.put(key, val);
359 else if (super.has(key)) super.put(key, val);
360 else throw new JS.Exn("must declare " + key + " before using it!");