Reorganized the project as multi-maven module

Updated README
Added language module with grammar
Split the code into common and chapter01 modules.
Removed a number of utility classes that were imported from AA.
Added github workflow file.

1 files changed, 170 insertions, 0 deletions

diff --git a/language/src/main/antlr4/com/seaofnodes/simple/antlr/SimpleLanguage.g4 b/language/src/main/antlr4/com/seaofnodes/simple/antlr/SimpleLanguage.g4
new file mode 100644
index 00000000..6779e5a2
--- /dev/null
+++ b/language/src/main/antlr4/com/seaofnodes/simple/antlr/SimpleLanguage.g4
@@ -0,0 +1,170 @@
+grammar SimpleLanguage;
+
+program
+    : declaration* statement+ EOF
+    ;
+
+declaration
+    : type IDENTIFIER ';'
+    ;
+
+type
+    : 'int'
+    ;
+
+statement
+    : 'if' '(' expression ')' statement
+    | 'if' '(' expression ')' statement 'else' statement
+    | 'while' '(' expression ')' statement
+    | IDENTIFIER '=' expression ';'
+    | '{' declaration* statement+ '}'
+    | 'break' ';'
+    ;
+
+expression
+    : primaryExpression                                             # PrimaryExpression_
+    | ('-' | '!') expression                                        # UnaryExpression
+    | expression ('*' | '/' ) expression                            # ArithmeticOrLogicalExpression
+    | expression ('+' | '-') expression                             # ArithmeticOrLogicalExpression
+    | expression ('==' | '!='| '>'| '<'| '>='| '<=') expression     # ComparisonExpression
+    | expression '&&' expression                                    # BooleanExpression
+    | expression '||' expression                                    # BooleanExpression
+    ;
+
+primaryExpression
+    :
+    | INTEGER_LITERAL
+    | IDENTIFIER
+    | '(' expression ')'
+    ;
+
+///////////////////////////////////////////////////////////////////
+
+IDENTIFIER
+    :   IDENTIFIER_NONDIGIT
+        (   IDENTIFIER_NONDIGIT
+        |   DEC_DIGIT
+        )*
+    ;
+
+fragment
+IDENTIFIER_NONDIGIT
+    :   NON_DIGIT
+    |   UNIVERSAL_CHARACTER_NAME
+    ;
+
+fragment
+NON_DIGIT
+    :   [a-zA-Z_]
+    ;
+
+
+fragment
+UNIVERSAL_CHARACTER_NAME
+    :   '\\u' HEX_QUAD
+    |   '\\U' HEX_QUAD HEX_QUAD
+    ;
+
+fragment
+HEX_QUAD
+    :   HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT
+    ;
+
+// tokens char and string
+CHAR_LITERAL
+   : '\''
+   (
+      ~['\\\n\r\t]
+      | QUOTE_ESCAPE
+      | ASCII_ESCAPE
+      | UNICODE_ESCAPE
+   ) '\''
+   ;
+
+STRING_LITERAL
+   : '"'
+   (
+      ~["]
+      | QUOTE_ESCAPE
+      | ASCII_ESCAPE
+      | UNICODE_ESCAPE
+      | ESC_NEWLINE
+   )* '"'
+   ;
+RAW_STRING_LITERAL: 'r' RAW_STRING_CONTENT;
+fragment RAW_STRING_CONTENT: '#' RAW_STRING_CONTENT '#' | '"' .*? '"';
+BYTE_LITERAL: 'b\'' (. | QUOTE_ESCAPE | BYTE_ESCAPE) '\'';
+
+BYTE_STRING_LITERAL: 'b"' (~["] | QUOTE_ESCAPE | BYTE_ESCAPE)* '"';
+RAW_BYTE_STRING_LITERAL: 'br' RAW_STRING_CONTENT;
+fragment ASCII_ESCAPE: '\\x' OCT_DIGIT HEX_DIGIT | COMMON_ESCAPE;
+fragment BYTE_ESCAPE: '\\x' HEX_DIGIT HEX_DIGIT | COMMON_ESCAPE;
+fragment COMMON_ESCAPE: '\\' [nrt\\0];
+fragment UNICODE_ESCAPE
+   : '\\u{' HEX_DIGIT HEX_DIGIT? HEX_DIGIT? HEX_DIGIT? HEX_DIGIT? HEX_DIGIT? '}'
+   ;
+fragment QUOTE_ESCAPE: '\\' ['"];
+fragment ESC_NEWLINE: '\\' '\n';
+
+// number
+INTEGER_LITERAL
+   :
+   (
+      DEC_LITERAL
+      | BIN_LITERAL
+      | OCT_LITERAL
+      | HEX_LITERAL
+   ) INTEGER_SUFFIX?
+   ;
+DEC_LITERAL: DEC_DIGIT (DEC_DIGIT | '_')*;
+HEX_LITERAL: '0x' '_'* HEX_DIGIT (HEX_DIGIT | '_')*;
+OCT_LITERAL: '0o' '_'* OCT_DIGIT (OCT_DIGIT | '_')*;
+BIN_LITERAL: '0b' '_'* [01] [01_]*;
+FLOAT_LITERAL
+   : DEC_LITERAL
+   (
+      '.' DEC_LITERAL
+   )? FLOAT_EXPONENT? FLOAT_SUFFIX?
+   ;
+
+fragment INTEGER_SUFFIX
+   : 'u8'
+   | 'u16'
+   | 'u32'
+   | 'u64'
+   | 'u128'
+   | 'usize'
+   | 'i8'
+   | 'i16'
+   | 'i32'
+   | 'i64'
+   | 'i128'
+   | 'isize'
+   ;
+
+fragment FLOAT_SUFFIX: 'f32' | 'f64';
+fragment FLOAT_EXPONENT: [eE] [+-]? '_'* DEC_LITERAL;
+fragment OCT_DIGIT: [0-7];
+fragment DEC_DIGIT: [0-9];
+fragment HEX_DIGIT: [0-9a-fA-F];
+
+
+WHITESPACE
+    :   [ \t]+
+        -> skip
+    ;
+
+NEWLINE
+    :   (   '\r' '\n'?
+        |   '\n'
+        )
+        -> skip
+    ;
+
+LINE_COMMENT
+    :   '//' ~[\r\n]*
+        -> skip
+    ;
+
+
+ANY: . ;
\ No newline at end of file