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TRS-8051-Syntax.txt
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TRS-8051-Syntax.txt
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"Name" = 'TRS-51 8051 LEVEL 2 BASIC'
"Author" = 'Dennis Hawkins'
"Version" = '1.0'
"About" = 'This is a custom 8051 BASIC that mimic's TRS-80 LEVEL II BASIC.'
Legend:
'*' - zero or more repititions.
'+' - one or more repititions.
"<>" required inclusion.
"{}" optional inclusion.
'|' one or the other.
'e' empty set.
'-' Range
Nothing is case sensitive.
; ----------------- ATOMIC DEFINITIONS
NewLine ::= CR {LF}
Whitespace ::= <' ' | TAB>
Digit ::= <'0' - '9'>
Digits ::= <Digit> {Digit}*
Alpha ::= <'A' - 'Z'>
| <'a' - 'z'>
AlphaNumeric ::= <Alpha> | <Digit>
Punctuation ::= '!' | '"' | '#' | '$' | '%' | '&' | ''' | '('
| ')' | '*' | '+' | ',' | '-' | '.' | '/' | ':'
| ';' | '<' | '=' | '>' | '?' | '@' | '[' | '\'
| ']' | '^' | '_' | '`' | '{' | '|' | '}' | '~'
Printable ::= <AlphaNumeric> | <Punctuation> | <WhiteSpace>
String-Chars ::= <Printable>
; PROGRAM LINE DEFINITIONS
Line ::= <Line-Num> <Statements> <newline>
Lines ::= <Lines> <Line>
| <Line>
Line-Num ::= <Integer>
Line-Range ::= <Line-Num>
| <Line-Num> '-'
| '-' <Line-Num>
| <Line-Num> '-' <Line-Num>
Line-Expr ::= <Line-Num>
| <Num-Expr>
Statements ::= <Statement> {':' <Statement>}*
Statement ::= <Console-Commands>
| <IO-Statements>
| <Program-Stmts>
| <Sequencing-Stmts>
| <Graphics-Stmts>
| <System-Stmts>
Console-Commands ::= 'AUTO' {<Line-Num> {, <uint>}}
| 'CLEAR'
| 'CONT'
| 'DELETE' <Line-Range>
| 'EDIT' <Line-Num>
| 'LIST' {Line-Range}
| 'NEW'
| 'RENUM' {Line-Num}{,{Line-Num}{,<Line-Num>}}
| 'RUN' {Line-Num}
IO-Statements ::= 'PRINT' {'@' <Num-Expr> ','} <Print-List> {';' | ','}
| 'PRINT' {'@' <Num-Expr> ','} USING <Format-Str> ';' <Print-List>
| 'INPUT' {<Str-Const> ';'} <Variable-list>
| 'LINE' 'INPUT' {<Str-Const> ';'} <Str-Variable>
| 'DATA' <Constant-List>
| 'READ' <Variable-List>
| 'RESTORE' {Line-Num}
Program-Stmts ::= 'DEFDBL' <Alpha-List> ; Works the same as DEFSNG
| 'DEFINT' <Alpha-List>
| 'DEFSNG' <Alpha-List>
| 'DEFSTR' <Alpha-List>
| 'DIM' <Variable> {'(' <Num-Expr-List> ')'} {',' <Variable> {'(' <Num-Expr-List> ')'} }*
| 'LET' <assignment>
| <assignment>
Sequencing-Stmts ::= 'END
| 'STOP'
| 'GOTO' <Line-expr>
| 'GOSUB' <Line-expr>
| 'RETURN'
| 'ON' <num-expr> { 'GOTO' | 'GOSUB' } <Line-expr> {',' <Line-Expr>}*
| 'ON' 'ERROR' 'GOTO' <Line-Num>
| 'RESUME' {<Line-Num> | 'NEXT' }
| 'FOR' <Loop-Variable> '=' <num-expr> 'TO' <num-expr> {'STEP' <num-expr>}
| 'NEXT' {<Num-Variable> {,<Num-Variable>)* }
| 'REM' {<Printable>}*
| 'IF' <expression> 'THEN' <If-Statements> {'ELSE' <If-Statemnts>}
| 'IF' <expression> 'GOTO' <Line-Expr> {'ELSE' <If-Statements>}
Graphics-Stmts ::= 'CLS'
| 'PLOT' <Num-expr> ',' <Num-expr>
| 'UNPLOT' <Num-expr> ',' <Num-expr>
System-Stmts ::= 'PAUSE' <Num-Expr>
; ----------------- VARIABLES
Variable ::= <Num-Variable>
| <Str-Variable>
| <Untyped-Variable>
Num-Variable ::= <Int-variable>
| <Float-Var>
Simple-Int-Var ::= <Identifier '%'>
Int-Variable ::= <Simple-Int-Var> {'(' <Num-Expr-List> ')' }
Simple-Float-Var ::= <Identifier '#'>
Float-Var ::= <Simple-Float-Var> { '(' <Num-Expr-List> ')' }
Simple-Str-Var ::= <Identifier '$'>
Str-Variable ::= <Simple-Str-Var> { '(' <Num-Expr-List> ')' }
Simple-Untyped-Var ::= <Identifier>
Untyped-Var ::= <Simple-Untyped-Var> { '(' <Num-Expr-List> ')' }
Identifier ::= <Alpha> {Alphanumeric}*
Loop_Variable ::= <Simple-Int-Var>
| <Simple-Float-Var>
| <Simple-Untyped-Var> ; Must resolve to a Simple-Int-Var or Simple-Float-Var
; -------------------- CONSTANTS
Constant ::= <Num-Const>
| <Str-Const>
Num-Const ::= <Integer>
| <Float>
Integer ::= {Sign} <Digits>
Sign ::= <'-' | '+'>
Float ::= {sign} {Real-Num} {Exponent}
Real-Num ::= <Digits {'.' {Digit}* }>
| <'.' Digits>
Exponent ::= <'e'|'E'> {Sign} <Digits>
Str-Const ::= '"' {String Chars}* '"'
; -------------- LISTS OF ITEMS
Variable-List ::= <Variable> {',' <Variable>}*
Constant-List ::= <Constant> {',' <Constant>}*
Expression-List ::= <Expression> {',' <Expression>}*
Num-Expr-List ::= <Num-Expr> {',' <Num-Expr>}*
Expression ::= <Num-Expr>
| <Str-Expr>
Print-List ::= <Expression> {<';' | ','> <Expression>}*
Format-Str ::= <String-Expr>
If-Statements ::= <Line-Num>
| <Statements>
Alpha-List ::= <Alpha> {',' <Alpha-List>}
| <Alpha> '-' <Alpha> {',' <Alpha-List>}
; ------------------------------------- Numerical Expressions
Assignment ::= <Num-Variable> '=' <Num-Expr>
| <Str-Variable> '=' <String-Expr>
Num-Expr ::= <And-Exp> 'OR' <Num-Expr>
| <And-Exp>
And-Exp ::= <Not-Exp> 'AND' <And-Exp>
| <Not-Exp>
Not-Exp ::= 'NOT' <Compare-Exp>
| <Compare-Exp>
Compare-Exp ::= <Add-Exp> '=' <Compare-Exp>
| <Add-Exp> '<>' <Compare-Exp>
| <Add-Exp> '>' <Compare-Exp>
| <Add-Exp> '>=' <Compare-Exp>
| <Add-Exp> '<' <Compare-Exp>
| <Add-Exp> '<=' <Compare-Exp>
| <Add-Exp>
Add-Exp ::= <Mult-Exp> '+' <Add-Exp>
| <Mult-Exp> '-' <Add-Exp>
| <Mult-Exp>
Mult-Exp ::= <Negate-Exp> '*' <Mult-Exp>
| <Negate-Exp> '/' <Mult-Exp>
| <Negate-Exp> 'MOD' <Mult-Exp>
| <Negate-Exp>
Negate-Exp ::= '-' <Power-Exp>
| <Power-Exp>
Power-Exp ::= <Power-Exp> '^' <Sub-Exp>
| <Sub-Exp>
Sub Exp ::= '(' <Num-Expr> ')'
| <Num-Value>
Num-Value ::= <Num-Variable>
| <Num-Const>
| <Num-Function>
Num-Function ::= 'ABS' '(' <Num-Expr> ')'
| 'ASC' '(' <Str-Expr> ')'
| 'AT' '(' <Num-Expr> ',' <Num-Expr> ')'
| 'ATN' '(' <Num-Expr> ')'
| 'CINT' '(' <Num-Expr> ')'
| 'COS' '(' <Num-Expr> ')'
| 'ERL'
| 'ERR'
| 'EXTKEY'
| 'EXP' '(' <Num-Expr> ')'
| 'FIX' '(' <Num-Expr> ')'
| 'INT' '(' <Num-Expr> ')'
| 'LEN' '(' <Str-Expr> ')'
| 'LOG' '(' <Num-Expr> ')'
| 'MEM'
| 'PEEK' '(' <Num-Expr> ')'
| 'PI'
| 'POINT' '(' <Num-Expr> ',' <Num-Expr> ')'
| 'POSX'
| 'POSY'
| 'RND' '(' <Num-Expr> ')'
| 'SGN' '(' <Num-Expr> ')'
| 'SIN' '(' <Num-Expr> ')'
| 'SPC' '(' <Expression> ')'
| 'SQR' '(' <Num-Expr> ')'
| 'TAB' '(' <Num-Expr> ')'
| 'TAN' '(' <Num-Expr> ')'
| 'TIMER'
| 'VAL' '(' <Str-Expr> ')'
! ----------------------------------------- String Expressions
String-Expr ::= <Str-Compare>
Str-Compare ::= <Concat-Expr> '=' <Str-Compare>
| <Concat-Expr> '<>' <Str-Compare>
| <Concat-Expr> '>' <Str-Compare>
| <Concat-Expr> '>=' <Str-Compare>
| <Concat-Expr> '<' <Str-Compare>
| <Concat-Expr> '<=' <Str-Compare>
| <Concat-Expr>
Concat-Expr ::= <Str-Sub> '+' <Concat-Expr>
| <Concat-Expr>
Str-Sub ::= '(' <Str-Expr> ')'
| <Str-Value>
Str-Value ::= <Str-Variable>
| <Str-Const>
| <Str-Function>
Str-Function ::= 'CHR$' '(' <Num-Expr> ')'
| 'INKEY$' '(' <Num-Expr> ')'
| 'LEFT$' '(' <Str-Expr> ',' <Num-Expr> ')'
| 'MID$' '(' <Str-Expr> ',' <Num-Expr> ',' <Num-Expr> ')'
| 'RIGHT$' '(' <Str-Expr> ',' <Num-Expr> ')'
| 'STR$' '(' <Num-Expr> ')'
| 'STRING$' '(' <Num-Expr> ',' <Str-Expr> ')'