com.oracle.truffle.api.strings

Class TruffleString.ByteIndexOfCodePointSetNode

java.lang.Object

com.oracle.truffle.api.nodes.Node

com.oracle.truffle.api.strings.TruffleString.ByteIndexOfCodePointSetNode

All Implemented Interfaces:

NodeInterface, Cloneable

Enclosing class:

TruffleString

public abstract static class TruffleString.ByteIndexOfCodePointSetNode
extends Node

Node to find the byte index of the first occurrence of a codepoint present in a given codepoint set. See TruffleString.ByteIndexOfCodePointSetNode.execute(AbstractTruffleString, int, int, TruffleString.CodePointSet) for details.

Since:

23.0

Nested Class Summary

Nested classes/interfaces inherited from class com.oracle.truffle.api.nodes.Node

Node.Child, Node.Children

Method Summary

Modifier and Type	Method and Description
static TruffleString.ByteIndexOfCodePointSetNode	create() Create a new TruffleString.ByteIndexOfCodePointSetNode.
abstract int	execute(AbstractTruffleString a, int fromByteIndex, int toByteIndex, TruffleString.CodePointSet codePointSet) Returns the byte index of the first codepoint present in the given TruffleString.CodePointSet, bounded by fromByteIndex (inclusive) and toByteIndex (exclusive).
static TruffleString.ByteIndexOfCodePointSetNode	getUncached() Get the uncached version of TruffleString.ByteIndexOfCodePointSetNode.

Methods inherited from class com.oracle.truffle.api.nodes.Node

accept, adoptChildren, atomic, atomic, copy, deepCopy, getChildren, getCost, getDebugProperties, getDescription, getEncapsulatingSourceSection, getLock, getParent, getRootNode, getSourceSection, insert, insert, isAdoptable, isSafelyReplaceableBy, notifyInserted, onReplace, replace, replace, reportPolymorphicSpecialize, toString

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

execute

public abstract int execute(AbstractTruffleString a,
                            int fromByteIndex,
                            int toByteIndex,
                            TruffleString.CodePointSet codePointSet)

Returns the byte index of the first codepoint present in the given TruffleString.CodePointSet, bounded by fromByteIndex (inclusive) and toByteIndex (exclusive).

TruffleString.ByteIndexOfCodePointSetNode will specialize on the given TruffleString.CodePointSet's content, which is therefore required to be partial evaluation constant.

Usage example: A node that scans a string for a known set of code points and escapes them with '\'.

 
 abstract static class StringEscapeNode extends Node {

     public static final TruffleString.Encoding ENCODING = TruffleString.Encoding.UTF_32;
     public static final TruffleString.ByteIndexOfCodePointSetNode.CodePointSet ESCAPE_CHARS = TruffleString.ByteIndexOfCodePointSetNode.CodePointSet.fromRanges(new int[]{
                     '\n', '\n',
                     '\r', '\r',
                     // ....
     }, ENCODING);

     abstract TruffleString execute(TruffleString input);

     @Specialization
     static TruffleString run(TruffleString input,
                     @Cached TruffleString.ByteIndexOfCodePointSetNode byteIndexOfCodePointSetNode,
                     @Cached TruffleStringBuilder.AppendSubstringByteIndexNode appendSubstringByteIndexNode,
                     @Cached TruffleString.CodePointAtByteIndexNode codePointAtByteIndexNode,
                     @Cached TruffleStringBuilder.AppendCodePointNode appendCodePointNode,
                     @Cached TruffleString.ByteLengthOfCodePointNode byteLengthOfCodePointNode,
                     @Cached TruffleStringBuilder.ToStringNode toStringNode) {
         int byteLength = input.byteLength(ENCODING);
         TruffleStringBuilder sb = TruffleStringBuilder.create(ENCODING, byteLength);
         int lastPos = 0;
         int pos = 0;
         while (pos >= 0) {
             pos = byteIndexOfCodePointSetNode.execute(input, lastPos, byteLength, ESCAPE_CHARS);
             int substringLength = (pos < 0 ? byteLength : pos) - lastPos;
             appendSubstringByteIndexNode.execute(sb, input, lastPos, substringLength);
             if (pos >= 0) {
                 int codePoint = codePointAtByteIndexNode.execute(input, pos, ENCODING);
                 appendCodePointNode.execute(sb, '\\');
                 appendCodePointNode.execute(sb, codePoint);
                 int codePointLength = byteLengthOfCodePointNode.execute(input, pos, ENCODING);
                 lastPos = pos + codePointLength;
             }
         }
         return toStringNode.execute(sb);
     }
 }
 
 
 

Parameters:

codePointSet - The set of codepoints to look for. This parameter is expected to be partial evaluation constant.

Since:

23.0

create

public static TruffleString.ByteIndexOfCodePointSetNode create()

Create a new TruffleString.ByteIndexOfCodePointSetNode.

Since:

23.0

getUncached

public static TruffleString.ByteIndexOfCodePointSetNode getUncached()

Get the uncached version of TruffleString.ByteIndexOfCodePointSetNode.

Since:

23.0