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Add 10 non-overlapping ANTLR grammar examples with JUnit test #4893

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Add 10 non-overlapping ANTLR grammar examples with JUnit test #4893

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@sumittlearnbay sumittlearnbay commented Oct 12, 2025

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sumittlearnbay commented Oct 12, 2025

Added Grammars

Grammar Description / Feature Demonstrated
Arithmetic.g4 Demonstrates operator precedence and left recursion
BooleanExpr.g4 Parses boolean logic expressions with AND/OR/NOT
CSVFlexible.g4 Handles quoted and unquoted CSV fields with escaped quotes
MiniConfig.g4 INI-style key–value configuration syntax with comments
MiniQuery.g4 Simple SQL-like query syntax (SELECT–FROM–WHERE)
JSONMini.g4 Compact JSON subset supporting nested arrays/objects
MiniMarkdown.g4 Basic Markdown subset (headings, bold text)
URLParser.g4 Extracts scheme, host, port, and path from URLs
UnitExpr.g4 Parses numeric expressions with units (e.g., 10m/s, 5kg)
ChatCommand.g4 Recognizes chatbot-style slash commands (e.g., /greet John)

Additional Files

  • GrammarCompilationTest.java
    Basic JUnit test verifying that grammars compile and produce valid parse trees.

Purpose

  • Provide example grammars for new users and test developers.
  • Demonstrate ANTLR’s flexibility across different grammar domains.
  • Add educational resources without overlapping existing examples.

Verification

Each grammar was validated using:

java -jar tool/target/antlr4-4.13.3-SNAPSHOT-complete.jar <GrammarName>.g4

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sumittlearnbay commented Oct 12, 2025

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