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119 lines
2.4 KiB
ANTLR
119 lines
2.4 KiB
ANTLR
/*
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BSD License
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Copyright (c) 2017, Tom Everett
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of Tom Everett nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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grammar tinybasic;
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program
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: line*
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EOF
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;
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line
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: number statement CR
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| statement CR
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;
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statement
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: 'PRINT' exprlist
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| 'IF' expression relop expression 'THEN'? statement
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| 'GOTO' number
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| 'INPUT' varlist
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| 'LET'? vara '=' expression
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| 'GOSUB' expression
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| 'RETURN'
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| 'CLEAR'
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| 'LIST'
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| 'RUN'
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| 'END'
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;
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exprlist
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: (STRING | expression) (',' (STRING | expression))*
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;
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varlist
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: vara (',' vara)*
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;
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expression
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: ('+' | '-' | 'ε')? term (('+' | '-') term)*
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;
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term
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: factor (('*' | '/') factor)*
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;
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factor
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:
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vara
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| number
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;
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vara
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: VAR
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| STRING
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;
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number
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: DIGIT +
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;
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relop
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: ('<' ('>' | '=' | 'ε')?)
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| ('>' ('<' | '=' | 'ε')?)
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| '='
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| '+'
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| '-'
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;
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STRING
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: '"' ~ ["\r\n]* '"'
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;
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DIGIT
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: '0' .. '9'
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;
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VAR
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: 'A' .. 'Z'
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;
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CR
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: [\r\n]+
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;
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WS
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: [ \t] -> skip
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;
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