Add project files

examples/combined/Expr.g4

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+// A small expression grammar in one combined file.
+//   antlrlab examples/combined/Expr.g4 examples/combined/input.txt
+grammar Expr;
+
+prog : expr EOF ;
+
+expr
+    : expr op=(MUL | DIV) expr   # MulDiv
+    | expr op=(ADD | SUB) expr   # AddSub
+    | INT                        # Int
+    | ID                         # Id
+    | '(' expr ')'               # Parens
+    ;
+
+MUL : '*' ;
+DIV : '/' ;
+ADD : '+' ;
+SUB : '-' ;
+INT : [0-9]+ ;
+ID  : [a-zA-Z_] [a-zA-Z_0-9]* ;
+WS  : [ \t\r\n]+ -> skip ;

examples/combined/input.txt

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+1 + 2 * (width - 3)

examples/combined/input_bad.txt

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+1 + * 2 (width

examples/json/JSON.g4

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+// JSON, straight from the ANTLR book. Try it on a .json file:
+//   antlrlab examples/json/JSON.g4 examples/json/example.json
+grammar JSON;
+
+json  : value EOF ;
+
+obj   : '{' pair (',' pair)* '}'
+      | '{' '}'
+      ;
+
+pair  : STRING ':' value ;
+
+arr   : '[' value (',' value)* ']'
+      | '[' ']'
+      ;
+
+value : STRING | NUMBER | obj | arr | 'true' | 'false' | 'null' ;
+
+STRING : '"' (ESC | SAFECODEPOINT)* '"' ;
+
+fragment ESC           : '\\' (["\\/bfnrt] | UNICODE) ;
+fragment UNICODE       : 'u' HEX HEX HEX HEX ;
+fragment HEX           : [0-9a-fA-F] ;
+fragment SAFECODEPOINT : ~["\\\u0000-\u001F] ;
+
+NUMBER : '-'? INT ('.' [0-9]+)? EXP? ;
+
+fragment INT : '0' | [1-9] [0-9]* ;
+fragment EXP : [Ee] [+\-]? INT ;
+
+WS : [ \t\n\r]+ -> skip ;

examples/json/example.json

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+{
+  "name": "antlrlab",
+  "tags": ["parser", "antlr", "diagram"],
+  "version": 1.0,
+  "stable": true,
+  "owner": null,
+  "nested": { "depth": 2, "items": [1, 2, 3] }
+}

examples/split/CalcLexer.g4

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+// Lexer and parser in separate files.
+//   antlrlab examples/split/CalcLexer.g4 examples/split/CalcParser.g4 examples/split/input.txt
+lexer grammar CalcLexer;
+
+PLUS   : '+' ;
+MINUS  : '-' ;
+STAR   : '*' ;
+SLASH  : '/' ;
+LPAREN : '(' ;
+RPAREN : ')' ;
+ASSIGN : '=' ;
+SEMI   : ';' ;
+
+NUMBER : [0-9]+ ('.' [0-9]+)? ;
+IDENT  : [a-zA-Z_] [a-zA-Z_0-9]* ;
+
+LINE_COMMENT : '//' ~[\r\n]* -> channel(HIDDEN) ;
+WS           : [ \t\r\n]+    -> skip ;

examples/split/CalcParser.g4

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+parser grammar CalcParser;
+
+options { tokenVocab = CalcLexer; }
+
+program   : statement* EOF ;
+
+statement : IDENT ASSIGN expression SEMI ;
+
+expression
+    : expression (STAR | SLASH) expression
+    | expression (PLUS | MINUS) expression
+    | LPAREN expression RPAREN
+    | NUMBER
+    | IDENT
+    ;

examples/split/input.txt

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+// two statements
+width  = 4;
+area   = width * (width + 2.5) - 1;