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| <meta name="keywords" content="lookAhead()"> |
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| <li>Summary: </li> |
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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.ibm.dtfj.javacore.parser.framework.scanner</a></div> |
| <h2 title="Class LookAheadBuffer" class="title">Class LookAheadBuffer</h2> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">java.lang.Object</a></li> |
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| <ul class="inheritance"> |
| <li>com.ibm.dtfj.javacore.parser.framework.scanner.LookAheadBuffer</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">LookAheadBuffer</span> |
| extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">Object</a> |
| implements <a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></pre> |
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| <h3>Constructor Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(int,com.ibm.dtfj.javacore.parser.framework.scanner.IScanner)">LookAheadBuffer</a></span>​(int size, |
| <a href="IScanner.html" title="interface in com.ibm.dtfj.javacore.parser.framework.scanner">IScanner</a> scanner)</code></th> |
| <td class="colLast"> </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#consume()">consume</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Consumes the first element in the buffer</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#init()">init</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="IParserToken.html" title="interface in com.ibm.dtfj.javacore.parser.framework.scanner">IParserToken</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#lookAhead(int)">lookAhead</a></span>​(int depth)</code></th> |
| <td class="colLast"> |
| <div class="block">Looks ahead by a depth amount.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#match(java.lang.String)">match</a></span>​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> tokenType)</code></th> |
| <td class="colLast"> |
| <div class="block">Matches a given type to the token type found at the first element of the buffer.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setLookAheadDepth(int)">setLookAheadDepth</a></span>​(int depth)</code></th> |
| <td class="colLast"> |
| <div class="block">Depth of the lookahead can be changed after creation.</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>Methods declared in class java.lang.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink" target="_blank">clone</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink" target="_blank">equals</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink" target="_blank">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink" target="_blank">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink" target="_blank">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink" target="_blank">notify</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink" target="_blank">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink" target="_blank">toString</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink" target="_blank">wait</a></code></li> |
| </ul> |
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| <li class="blockList"><a id="methods.inherited.from.class.com.ibm.dtfj.javacore.parser.framework.parser.ILookAheadBuffer"> |
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| </a> |
| <h3>Methods declared in interface com.ibm.dtfj.javacore.parser.framework.parser.<a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></h3> |
| <code><a href="../parser/ILookAheadBuffer.html#allConsumed()">allConsumed</a>, <a href="../parser/ILookAheadBuffer.html#length()">length</a>, <a href="../parser/ILookAheadBuffer.html#maxDepth()">maxDepth</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <section role="region"> |
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| <li class="blockList"><a id="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a id="<init>(int,com.ibm.dtfj.javacore.parser.framework.scanner.IScanner)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>LookAheadBuffer</h4> |
| <pre>public LookAheadBuffer​(int size, |
| <a href="IScanner.html" title="interface in com.ibm.dtfj.javacore.parser.framework.scanner">IScanner</a> scanner)</pre> |
| </li> |
| </ul> |
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| <a id="match(java.lang.String)"> |
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| <h4>match</h4> |
| <pre class="methodSignature">public boolean match​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> tokenType)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../parser/ILookAheadBuffer.html#match(java.lang.String)">ILookAheadBuffer</a></code></span></div> |
| <div class="block">Matches a given type to the token type found at the first element of the buffer.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../parser/ILookAheadBuffer.html#match(java.lang.String)">match</a></code> in interface <code><a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tokenType</code> - </dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if match is successful</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="consume()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>consume</h4> |
| <pre class="methodSignature">public void consume() |
| throws <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a>, |
| <a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a></pre> |
| <div class="block">Consumes the first element in the buffer</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../parser/ILookAheadBuffer.html#consume()">consume</a></code> in interface <code><a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="lookAhead(int)"> |
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| </a> |
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| <h4>lookAhead</h4> |
| <pre class="methodSignature">public <a href="IParserToken.html" title="interface in com.ibm.dtfj.javacore.parser.framework.scanner">IParserToken</a> lookAhead​(int depth) |
| throws <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a>, |
| <a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a>, |
| <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IndexOutOfBoundsException</a></pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../parser/ILookAheadBuffer.html#lookAhead(int)">ILookAheadBuffer</a></code></span></div> |
| <div class="block">Looks ahead by a depth amount. The lowest depth to look ahead is 1. Note that in some cases, |
| a lookahead may be attempted on an earlier error condition that lead to an empty buffer (e.g., |
| an exception was thrown during a fill process, and although more tokens may remain in the |
| input source, the lookahead value may itself be null. Consequently, the lookahead buffer refills first |
| before attempting the lookahead.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../parser/ILookAheadBuffer.html#lookAhead(int)">lookAhead</a></code> in interface <code><a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>depth</code> - to lookahead</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>token at specified lookahead depth or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank"><code>IndexOutOfBoundsException</code></a>.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IndexOutOfBoundsException</a></code> - if depth is outside the depth range of the buffer. Minimum depth is always 1.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../parser/ILookAheadBuffer.html#lookAhead(int)"><code>ILookAheadBuffer.lookAhead(int)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="init()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>init</h4> |
| <pre class="methodSignature">public void init() |
| throws <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a>, |
| <a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a></pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../parser/ILookAheadBuffer.html#init()">init</a></code> in interface <code><a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>setLookAheadDepth</h4> |
| <pre class="methodSignature">public void setLookAheadDepth​(int depth) |
| throws <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a>, |
| <a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a></pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../parser/ILookAheadBuffer.html#setLookAheadDepth(int)">ILookAheadBuffer</a></code></span></div> |
| <div class="block">Depth of the lookahead can be changed after creation. |
| <br> |
| If the new depth is less that the current depth, |
| no new tokens will be read until the outstanding tokens (current depth - new depth) |
| are first consumed. |
| <br> |
| If the new depth is greater than the current depth, |
| the lookahead will read new tokens to fill the delta. |
| <br></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../parser/ILookAheadBuffer.html#setLookAheadDepth(int)">setLookAheadDepth</a></code> in interface <code><a href="../parser/ILookAheadBuffer.html" title="interface in com.ibm.dtfj.javacore.parser.framework.parser">ILookAheadBuffer</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>depth</code> - to change</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="ScannerException.html" title="class in com.ibm.dtfj.javacore.parser.framework.scanner">ScannerException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink" target="_blank">IOException</a></code></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../parser/ILookAheadBuffer.html#setLookAheadDepth(int)"><code>ILookAheadBuffer.setLookAheadDepth(int)</code></a></dd> |
| </dl> |
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