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package org.webmacro.directive; |
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import java.io.IOException; |
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import java.util.Iterator; |
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|
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import org.webmacro.Context; |
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import org.webmacro.FastWriter; |
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import org.webmacro.Macro; |
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import org.webmacro.PropertyException; |
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import org.webmacro.TemplateVisitor; |
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import org.webmacro.engine.Block; |
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import org.webmacro.engine.BuildContext; |
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import org.webmacro.engine.BuildException; |
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import org.webmacro.engine.Expression; |
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import org.webmacro.engine.UndefinedMacro; |
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import org.webmacro.engine.Variable; |
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| 44 | 142 | public class ForeachDirective extends Directive |
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{ |
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|
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private static final int FOREACH_TARGET = 1; |
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private static final int FOREACH_IN_K = 2; |
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private static final int FOREACH_LIST = 3; |
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private static final int FOREACH_BODY = 4; |
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private static final int FOREACH_INDEXING_K = 5; |
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private static final int FOREACH_INDEX = 6; |
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private static final int FOREACH_LIMIT_K = 7; |
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private static final int FOREACH_LIMIT = 8; |
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private static final int FOREACH_FROM_K = 9; |
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private static final int FOREACH_FROM = 10; |
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|
| 58 | 2 | private static final UndefinedMacro UNDEF = UndefinedMacro.getInstance(); |
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|
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private Variable target, index; |
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private Object list, indexFromExpr, limitExpr; |
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private Macro body; |
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private static final ArgDescriptor[] |
| 70 | 2 | myArgs = new ArgDescriptor[]{ |
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new LValueArg(FOREACH_TARGET), |
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new KeywordArg(FOREACH_IN_K, "in"), |
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new RValueArg(FOREACH_LIST), |
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new OptionChoice(2), |
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new OptionalGroup(3), |
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new KeywordArg(FOREACH_INDEXING_K, "indexing"), |
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new LValueArg(FOREACH_INDEX), |
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new OptionalGroup(2), |
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new KeywordArg(FOREACH_FROM_K, "from"), |
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new RValueArg(FOREACH_FROM), |
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new OptionalGroup(2), |
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new KeywordArg(FOREACH_LIMIT_K, "limit"), |
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new RValueArg(FOREACH_LIMIT), |
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new BlockArg(FOREACH_BODY) |
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}; |
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private static final DirectiveDescriptor |
| 88 | 2 | myDescr = new DirectiveDescriptor("foreach", null, myArgs, null); |
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public static DirectiveDescriptor getDescriptor () |
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{ |
| 92 | 6 | return myDescr; |
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} |
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|
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public Object build (DirectiveBuilder builder, |
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BuildContext bc) |
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throws BuildException |
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{ |
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try |
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{ |
| 101 | 142 | target = (Variable) builder.getArg(FOREACH_TARGET, bc); |
| 102 | 142 | index = (Variable) builder.getArg(FOREACH_INDEX, bc); |
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} |
| 104 | 0 | catch (ClassCastException e) |
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{ |
| 106 | 0 | throw new NotVariableBuildException(myDescr.name, e); |
| 107 | 142 | } |
| 108 | 142 | list = builder.getArg(FOREACH_LIST, bc); |
| 109 | 142 | body = (Block) builder.getArg(FOREACH_BODY, bc); |
| 110 | 142 | indexFromExpr = builder.getArg(FOREACH_FROM, bc); |
| 111 | 142 | limitExpr = builder.getArg(FOREACH_LIMIT, bc); |
| 112 | 142 | return this; |
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} |
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|
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public void write (FastWriter out, Context context) |
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throws PropertyException, IOException |
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{ |
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|
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Object l, limit, from; |
| 120 | 2168 | int loopLimit = -1, loopStart = 1, loopIndex = 0; |
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|
| 122 | 2168 | l = list; |
| 123 | 4336 | while (l instanceof Macro && l != UNDEF) |
| 124 | 2168 | l = ((Macro) l).evaluate(context); |
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|
| 126 | 2168 | if (limitExpr != null) |
| 127 | |
{ |
| 128 | 0 | limit = limitExpr; |
| 129 | 0 | while (limit instanceof Macro && limit != UNDEF) |
| 130 | 0 | limit = ((Macro) limit).evaluate(context); |
| 131 | 0 | if (Expression.isNumber(limit)) |
| 132 | 0 | loopLimit = (int) Expression.numberValue(limit); |
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else |
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{ |
| 135 | 0 | String warning = "#foreach: Cannot evaluate limit"; |
| 136 | 0 | writeWarning(warning, context, out); |
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} |
| 138 | |
} |
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|
| 140 | 2168 | if (index != null && indexFromExpr != null) |
| 141 | |
{ |
| 142 | 0 | from = indexFromExpr; |
| 143 | 0 | while (from instanceof Macro && from != UNDEF) |
| 144 | 0 | from = ((Macro) from).evaluate(context); |
| 145 | 0 | if (Expression.isNumber(from)) |
| 146 | 0 | loopStart = (int) Expression.numberValue(from); |
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else |
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{ |
| 149 | 0 | String warning = "#foreach: Cannot evaluate loop start"; |
| 150 | 0 | writeWarning(warning, context, out); |
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} |
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} |
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|
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Iterator iter; |
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try |
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{ |
| 157 | 2168 | iter = context.getBroker()._propertyOperators.getIterator(l); |
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} |
| 159 | 4 | catch (Exception e) |
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{ |
| 161 | 4 | String warning = "#foreach: "; |
| 162 | 4 | if (list instanceof Variable) |
| 163 | 4 | warning += "$" + ((Variable) list).getVariableName(); |
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else |
| 165 | 0 | warning += list; |
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|
| 167 | 4 | warning += ": " + e.getMessage(); |
| 168 | 4 | writeWarning(warning, context, out); |
| 169 | 0 | return; |
| 170 | 2164 | } |
| 171 | |
while (iter.hasNext() |
| 172 | 21980 | && ((loopLimit == -1) |
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|| (loopLimit > loopIndex))) |
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{ |
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try |
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{ |
| 177 | 19818 | target.setValue(context, iter.next()); |
| 178 | 19816 | if (index != null) |
| 179 | 0 | index.setValue(context, new Integer(loopIndex + loopStart)); |
| 180 | |
} |
| 181 | 0 | catch (PropertyException e) |
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{ |
| 183 | 0 | String errorText = "#foreach: Unable to set list index"; |
| 184 | 0 | writeWarning(errorText, context, out); |
| 185 | |
} |
| 186 | 2 | catch (Exception e) |
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{ |
| 188 | 2 | throw new PropertyException("Unable to iterate list", e); |
| 189 | 19816 | } |
| 190 | 19816 | body.write(out, context); |
| 191 | 19816 | ++loopIndex; |
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} |
| 193 | 2162 | } |
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|
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public void accept (TemplateVisitor v) |
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{ |
| 197 | 0 | v.beginDirective(myDescr.name); |
| 198 | 0 | v.visitDirectiveArg("ForeachTarget", target); |
| 199 | 0 | v.visitDirectiveArg("ForeachList", list); |
| 200 | 0 | if (index != null) |
| 201 | 0 | v.visitDirectiveArg("ForeachIndex", index); |
| 202 | 0 | if (indexFromExpr != null) |
| 203 | 0 | v.visitDirectiveArg("ForeachFrom", indexFromExpr); |
| 204 | 0 | if (limitExpr != null) |
| 205 | 0 | v.visitDirectiveArg("ForeachLimit", limitExpr); |
| 206 | 0 | v.visitDirectiveArg("ForeachBlock", body); |
| 207 | 0 | v.endDirective(); |
| 208 | 0 | } |
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} |