Set up the basic structure of the project

.gitignore

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+*/bin/*
+bin/
+
+*.class
+
+# Package Files #
+*.war
+*.ear
+
+
+# Eclipse
+.settings/
+*.project
+*.classpath
+.prefs
+*.prefs
+.metadata/
+
+# Intellij
+.idea/
+*.iml
+*.iws
+out/
+
+# VSCode
+.vscode/
+
+# Mac
+.DS_Store
+
+# Maven
+log/*
+target/
+
+# Gradle
+.gradle/
+

antlr/CommonLexer.g4

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+lexer grammar CommonLexer;
+
+// Keywords
+
+ABSTRACT:           'abstract';
+ASSERT:             'assert';
+BOOLEAN:            'boolean';
+BREAK:              'break';
+BYTE:               'byte';
+CASE:               'case';
+CATCH:              'catch';
+CHAR:               'char';
+CLASS:              'class';
+CONST:              'const';
+CONTINUE:           'continue';
+DEFAULT:            'default';
+DO:                 'do';
+DOUBLE:             'double';
+ELSE:               'else';
+ENUM:               'enum';
+EXTENDS:            'extends';
+FINAL:              'final';
+FINALLY:            'finally';
+FLOAT:              'float';
+FOR:                'for';
+IF:                 'if';
+GOTO:               'goto';
+IMPLEMENTS:         'implements';
+IMPORT:             'import';
+INSTANCEOF:         'instanceof';
+INT:                'int';
+INTERFACE:          'interface';
+LONG:               'long';
+NATIVE:             'native';
+NEW:                'new';
+PACKAGE:            'package';
+PRIVATE:            'private';
+PROTECTED:          'protected';
+PUBLIC:             'public';
+RETURN:             'return';
+SHORT:              'short';
+STATIC:             'static';
+STRICTFP:           'strictfp';
+SUPER:              'super';
+SWITCH:             'switch';
+SYNCHRONIZED:       'synchronized';
+THIS:               'this';
+THROW:              'throw';
+THROWS:             'throws';
+TRANSIENT:          'transient';
+TRY:                'try';
+VOID:               'void';
+VOLATILE:           'volatile';
+WHILE:              'while';
+
+FUNCTION:           'function';
+
+STRING:             'string';   //added on 2019-08-29 by Richard Gong
+
+// Literals
+
+DECIMAL_LITERAL:    ('0' | [1-9] (Digits? | '_'+ Digits)) [lL]?;
+HEX_LITERAL:        '0' [xX] [0-9a-fA-F] ([0-9a-fA-F_]* [0-9a-fA-F])? [lL]?;
+OCT_LITERAL:        '0' '_'* [0-7] ([0-7_]* [0-7])? [lL]?;
+BINARY_LITERAL:     '0' [bB] [01] ([01_]* [01])? [lL]?;
+
+FLOAT_LITERAL:      (Digits '.' Digits? | '.' Digits) ExponentPart? [fFdD]?
+             |       Digits (ExponentPart [fFdD]? | [fFdD])
+             ;
+
+HEX_FLOAT_LITERAL:  '0' [xX] (HexDigits '.'? | HexDigits? '.' HexDigits) [pP] [+-]? Digits [fFdD]?;
+
+BOOL_LITERAL:       'true'
+            |       'false'
+            ;
+
+CHAR_LITERAL:       '\'' (~['\\\r\n] | EscapeSequence) '\'';
+
+STRING_LITERAL:     '"' (~["\\\r\n] | EscapeSequence)* '"';
+NULL_LITERAL:       'null';
+// Separators
+LPAREN:             '(';
+RPAREN:             ')';
+LBRACE:             '{';
+RBRACE:             '}';
+LBRACK:             '[';
+RBRACK:             ']';
+SEMI:               ';';
+COMMA:              ',';
+DOT:                '.';
+// Operators
+ASSIGN:             '=';
+GT:                 '>';
+LT:                 '<';
+BANG:               '!';
+TILDE:              '~';
+QUESTION:           '?';
+COLON:              ':';
+EQUAL:              '==';
+LE:                 '<=';
+GE:                 '>=';
+NOTEQUAL:           '!=';
+AND:                '&&';
+OR:                 '||';
+INC:                '++';
+DEC:                '--';
+ADD:                '+';
+SUB:                '-';
+MUL:                '*';
+DIV:                '/';
+BITAND:             '&';
+BITOR:              '|';
+CARET:              '^';
+MOD:                '%';
+ADD_ASSIGN:         '+=';
+SUB_ASSIGN:         '-=';
+MUL_ASSIGN:         '*=';
+DIV_ASSIGN:         '/=';
+AND_ASSIGN:         '&=';
+OR_ASSIGN:          '|=';
+XOR_ASSIGN:         '^=';
+MOD_ASSIGN:         '%=';
+LSHIFT_ASSIGN:      '<<=';
+RSHIFT_ASSIGN:      '>>=';
+URSHIFT_ASSIGN:     '>>>=';
+// Java 8 tokens
+ARROW:              '->';
+COLONCOLON:         '::';
+// Additional symbols not defined in the lexical specification
+AT:                 '@';
+ELLIPSIS:           '...';
+// Whitespace and comments
+WS:                 [ \t\r\n\u000C]+ -> channel(HIDDEN);
+COMMENT:            '/*' .*? '*/'    -> channel(HIDDEN);
+LINE_COMMENT:       '//' ~[\r\n]*    -> channel(HIDDEN);
+
+// Identifiers
+
+IDENTIFIER:         Letter LetterOrDigit*;
+
+// Fragment rules
+
+fragment ExponentPart
+    : [eE] [+-]? Digits
+    ;
+
+fragment EscapeSequence
+    : '\\' [btnfr"'\\]
+    | '\\' ([0-3]? [0-7])? [0-7]
+    | '\\' 'u'+ HexDigit HexDigit HexDigit HexDigit
+    ;
+fragment HexDigits
+    : HexDigit ((HexDigit | '_')* HexDigit)?
+    ;
+fragment HexDigit
+    : [0-9a-fA-F]
+    ;
+fragment Digits
+    : [0-9] ([0-9_]* [0-9])?
+    ;
+fragment LetterOrDigit
+    : Letter
+    | [0-9]
+    ;
+fragment Letter
+    : [a-zA-Z$_] // these are the "java letters" below 0x7F
+    | ~[\u0000-\u007F\uD800-\uDBFF] // covers all characters above 0x7F which are not a surrogate
+    | [\uD800-\uDBFF] [\uDC00-\uDFFF] // covers UTF-16 surrogate pairs encodings for U+10000 to U+10FFFF
+    ;

antlr/README.md

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+java -jar ./antlr-4.7.2-complete.jar -visitor Fatjs.g4
+
+javac *.java
+
+D:\code\fatjs\antlr>java org.antlr.v4.gui.TestRig Fatjs expression -gui
+age + 10 * 2  + 10
+^Z