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Move common ANTLR utility methods, such as extracting code or case insensitive streams into QL. Replace CaseInsensitiveStream (which relies on ANTLRInputStream which has been deprecated) with a CharStream variant.
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92 changes: 92 additions & 0 deletions
92
x-pack/plugin/ql/src/main/java/org/elasticsearch/xpack/ql/parser/CaseChangingCharStream.java
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0; you may not use this file except in compliance with the Elastic License | ||
| * 2.0. | ||
| */ | ||
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| package org.elasticsearch.xpack.ql.parser; | ||
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| import org.antlr.v4.runtime.CharStream; | ||
| import org.antlr.v4.runtime.misc.Interval; | ||
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| // Wrapping stream for handling case-insensitive grammars | ||
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| // This approach is taken from the ANTLR documentation | ||
| // https://github.com/antlr/antlr4/blob/master/doc/resources/CaseChangingCharStream.java | ||
| // https://github.com/antlr/antlr4/blob/master/doc/case-insensitive-lexing.md | ||
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| /** | ||
| * This class supports case-insensitive lexing by wrapping an existing | ||
| * {@link CharStream} and forcing the lexer to see either upper or | ||
| * lowercase characters. Grammar literals should then be either upper or | ||
| * lower case such as 'BEGIN' or 'begin'. The text of the character | ||
| * stream is unaffected. Example: input 'BeGiN' would match lexer rule | ||
| * 'BEGIN' if constructor parameter upper=true but getText() would return | ||
| * 'BeGiN'. | ||
| */ | ||
| public class CaseChangingCharStream implements CharStream { | ||
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| private final CharStream stream; | ||
| private final boolean upper; | ||
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| /** | ||
| * Constructs a new CaseChangingCharStream wrapping the given {@link CharStream} forcing | ||
| * all characters to upper case or lower case. | ||
| * @param stream The stream to wrap. | ||
| * @param upper If true force each symbol to upper case, otherwise force to lower. | ||
| */ | ||
| public CaseChangingCharStream(CharStream stream, boolean upper) { | ||
| this.stream = stream; | ||
| this.upper = upper; | ||
| } | ||
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| @Override | ||
| public String getText(Interval interval) { | ||
| return stream.getText(interval); | ||
| } | ||
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| @Override | ||
| public void consume() { | ||
| stream.consume(); | ||
| } | ||
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| @Override | ||
| public int LA(int i) { | ||
| int c = stream.LA(i); | ||
| if (c <= 0) { | ||
| return c; | ||
| } | ||
| return upper ? Character.toUpperCase(c) : Character.toLowerCase(c); | ||
| } | ||
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| @Override | ||
| public int mark() { | ||
| return stream.mark(); | ||
| } | ||
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| @Override | ||
| public void release(int marker) { | ||
| stream.release(marker); | ||
| } | ||
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| @Override | ||
| public int index() { | ||
| return stream.index(); | ||
| } | ||
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| @Override | ||
| public void seek(int index) { | ||
| stream.seek(index); | ||
| } | ||
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| @Override | ||
| public int size() { | ||
| return stream.size(); | ||
| } | ||
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| @Override | ||
| public String getSourceName() { | ||
| return stream.getSourceName(); | ||
| } | ||
| } |
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