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wip: implement some rules with nester statements for experimental parser
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
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@@ -25,6 +25,7 @@ public enum TokenType { | |
| NUMBER_LITERAL, | ||
| COBOL_WORD, | ||
| NEW_LINE, | ||
| DOT, | ||
| OTHER, | ||
| EOF | ||
| } | ||
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89 changes: 89 additions & 0 deletions
89
.../parser/src/main/java/org/eclipse/lsp/cobol/rules/procedure/ArithmeticExpressionRule.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /* | ||
| * Copyright (c) 2024 Broadcom. | ||
| * The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries. | ||
| * | ||
| * This program and the accompanying materials are made | ||
| * available under the terms of the Eclipse Public License 2.0 | ||
| * which is available at https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| * | ||
| * Contributors: | ||
| * Broadcom, Inc. - initial API and implementation | ||
| */ | ||
| package org.eclipse.lsp.cobol.rules.procedure; | ||
|
|
||
| import org.eclipse.lsp.cobol.parser.hw.ParsingContext; | ||
| import org.eclipse.lsp.cobol.parser.hw.lexer.TokenType; | ||
| import org.eclipse.lsp.cobol.rules.CobolLanguage; | ||
| import org.eclipse.lsp.cobol.rules.LanguageRule; | ||
|
|
||
| /** p. 266 */ | ||
| public class ArithmeticExpressionRule implements LanguageRule { | ||
|
|
||
| @Override | ||
| public void parse(ParsingContext ctx, CobolLanguage language) { | ||
| arithmeticExpression(ctx, language); | ||
| } | ||
|
|
||
| private void arithmeticExpression(ParsingContext ctx, CobolLanguage language) { | ||
| if (ctx.match("(")) { | ||
| ctx.consume("("); | ||
| do { | ||
| arithmeticExpression(ctx, language); | ||
| } while (!ctx.match(")")); | ||
| ctx.consume(")"); | ||
| ctx.spaces(); | ||
| // p. 267 | ||
| if (ctx.match("+", "-", "*", "/", "**")) { | ||
| ctx.or("+", "-", "*", "/", "**"); | ||
| ctx.spaces(); | ||
| arithmeticExpression(ctx, language); | ||
| } | ||
| return; | ||
| } | ||
|
|
||
| if (ctx.getLexer().peek().getType() == TokenType.NUMBER_LITERAL) { | ||
| ctx.consume(); | ||
| ctx.spaces(); | ||
| } else { | ||
| language.parseRule(IdentifierRule.class, ctx); | ||
| } | ||
| // p. 267 | ||
| if (ctx.match("+", "-", "*", "/", "**")) { | ||
| ctx.or("+", "-", "*", "/", "**"); | ||
| ctx.spaces(); | ||
| arithmeticExpression(ctx, language); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public boolean tryMatch(ParsingContext ctx, CobolLanguage language) { | ||
| // An arithmetic expression can consist of any of the following items: | ||
| // 1. An identifier described as a numeric elementary item (including numeric functions) | ||
| if (language.tryMatchRule(IdentifierRule.class, ctx)) { | ||
| return true; | ||
| } | ||
| // 2. A numeric literal | ||
| if (ctx.getLexer().peek().getType() == TokenType.NUMBER_LITERAL) { | ||
| return true; | ||
| } | ||
| // 3. The figurative constant ZERO | ||
| if (ctx.match("ZERO")) { | ||
| return true; | ||
| } | ||
| // 4. Identifiers and literals, as defined in items 1, 2, and 3, separated by arithmetic | ||
| // operators | ||
| // 5. Two arithmetic expressions, as defined in items 1, 2, 3, or 4, separated by an arithmetic | ||
| // operator | ||
| // 6. An arithmetic expression, as defined in items 1, 2, 3, 4, or 5, enclosed in parentheses | ||
| if (ctx.match("(")) { | ||
| return true; | ||
| } | ||
| // Any arithmetic expression can be preceded by a unary operator. | ||
| if (ctx.match("+", "-")) { | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
| } |
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