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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
AbstractTokenRule.java | 95.8% | 100% | 100% | 98.9% |
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// Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.tapestry.script;
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import org.apache.hivemind.Location;
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import org.apache.tapestry.util.xml.BaseRule;
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import org.apache.tapestry.util.xml.RuleDirectedParser;
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/**
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* Base class for the rules that build {@link org.apache.tapestry.script.IScriptToken}s.
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* Used with classes that can contain a mix of text and elements (those that
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* accept "full content").
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*
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*
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* @author Howard Lewis Ship
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* @since 3.0
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**/
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abstract class AbstractTokenRule extends BaseRule |
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{ |
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/**
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* Adds a token to its parent, the top object on the stack.
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*/
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protected void addToParent(RuleDirectedParser parser, IScriptToken token) |
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{ |
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IScriptToken parent = (IScriptToken) parser.peek(); |
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parent.addToken(token); |
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} |
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/**
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* Peeks at the top object on the stack (which must be a {@link IScriptToken}),
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* and converts the text into a series of {@link org.apache.tapestry.script.StaticToken} and
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* {@link org.apache.tapestry.script.InsertToken}s.
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*/
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public void content(RuleDirectedParser parser, String content) |
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{ |
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IScriptToken token = (IScriptToken) parser.peek(); |
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addTextTokens(token, content, parser.getLocation()); |
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} |
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private static final int STATE_START = 0; |
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private static final int STATE_DOLLAR = 1; |
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private static final int STATE_COLLECT_EXPRESSION = 2; |
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/**
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* Parses the provided text and converts it into a series of
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*/
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protected void addTextTokens(IScriptToken token, String text, Location location) |
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{ |
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char[] buffer = text.toCharArray();
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int state = STATE_START;
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int blockStart = 0;
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int blockLength = 0;
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int expressionStart = -1;
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int expressionLength = 0;
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int i = 0;
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int braceDepth = 0;
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while (i < buffer.length)
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{ |
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char ch = buffer[i];
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switch (state)
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{ |
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case STATE_START :
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if (ch == '$')
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{ |
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state = STATE_DOLLAR; |
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i++; |
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continue;
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} |
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blockLength++; |
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i++; |
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continue;
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case STATE_DOLLAR :
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if (ch == '{')
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{ |
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state = STATE_COLLECT_EXPRESSION; |
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i++; |
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expressionStart = i; |
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expressionLength = 0; |
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braceDepth = 1; |
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continue;
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} |
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// The '$' was just what it was, not the start of a ${} expression
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// block, so include it as part of the static text block.
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blockLength++; |
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state = STATE_START; |
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continue;
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case STATE_COLLECT_EXPRESSION :
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if (ch != '}')
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{ |
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if (ch == '{')
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braceDepth++; |
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i++; |
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expressionLength++; |
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continue;
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} |
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braceDepth--; |
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if (braceDepth > 0)
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{ |
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i++; |
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expressionLength++; |
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continue;
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} |
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// Hit the closing brace of an expression.
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// Degenerate case: the string "${}".
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if (expressionLength == 0)
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blockLength += 3; |
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if (blockLength > 0)
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token.addToken(constructStatic(text, blockStart, blockLength, location)); |
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if (expressionLength > 0)
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{ |
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String expression = |
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text.substring(expressionStart, expressionStart + expressionLength); |
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token.addToken(new InsertToken(expression, location));
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} |
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i++; |
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blockStart = i; |
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blockLength = 0; |
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// And drop into state start
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state = STATE_START; |
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continue;
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} |
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} |
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// OK, to handle the end. Couple of degenerate cases where
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// a ${...} was incomplete, so we adust the block length.
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if (state == STATE_DOLLAR)
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blockLength++; |
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if (state == STATE_COLLECT_EXPRESSION)
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blockLength += expressionLength + 2; |
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if (blockLength > 0)
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token.addToken(constructStatic(text, blockStart, blockLength, location)); |
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} |
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private IScriptToken constructStatic(
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String text, |
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int blockStart,
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int blockLength,
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Location location) |
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{ |
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String literal = text.substring(blockStart, blockStart + blockLength); |
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return new StaticToken(literal, location); |
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} |
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} |
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