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199 lines
3.1 KiB
ANTLR
199 lines
3.1 KiB
ANTLR
/*
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BSD License
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Copyright (c) 2013, 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 pdp7asm;
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prog
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: line+
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;
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line
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: declarations? comment? eol
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;
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declarations
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: declaration (';' declaration)*
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;
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declaration
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: label? (instruction | assignment | expression)?
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;
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instruction
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: opcode argument*
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;
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argument
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: expression
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;
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assignment
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: (variable | LOC | RELOC) '=' expression
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;
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expression
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: multiplyingExpression ((PLUS|MINUS) multiplyingExpression)*
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;
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multiplyingExpression
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: atom ((TIMES|DIV) atom)*
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;
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atom
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: variable
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| LOC
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| RELOC
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| STRING
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| DECIMAL
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| DECIMAL_MINUS
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| OCTAL
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| OCTAL_LITERAL
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| d
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;
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d
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: '-'? DECIMAL_LITERAL
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;
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eol
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: EOL
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;
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comment
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: COMMENT
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;
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label
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: LABEL
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;
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variable
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: IDENTIFIER
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;
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opcode
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: 'jms'
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| 'dac'
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| 'lac'
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| 'and'
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| 'jmp'
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| 'tad'
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| 'sad'
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| 'sys'
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| 'sna'
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| 'spa'
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| 'lacq'
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| 'lrss'
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| 'dzm'
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| 'sza'
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| 'lmq'
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| 'cll'
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| 'als'
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| 'omq'
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| 'isz'
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| 'sma'
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| 'skp'
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| 'law'
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| 'xor'
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| 'alss'
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| 'sac'
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| 'add'
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;
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LOC
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: '.'
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;
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RELOC
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: '..'
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;
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PLUS
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: '+'
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;
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MINUS
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: '-'
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;
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TIMES
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: '*'
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;
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DIV
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: '/'
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;
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LABEL
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: [a-zA-Z0-9]+ ':'
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;
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IDENTIFIER
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: [a-zA-Z] [a-zA-Z0-9]*
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;
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OCTAL_LITERAL
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: '0' [0-7]*
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;
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DECIMAL_LITERAL
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: [1-9] [0-9]*
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;
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DECIMAL
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: 'd' [0-9]+
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;
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OCTAL
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: 'o' [0-7]+
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;
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DECIMAL_MINUS
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: 'dm' [0-9]+
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;
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STRING
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: '<' [a-zA-Z0-9$*,%/]+ '>'
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;
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COMMENT
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: '"' ~[\r\n]*
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;
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EOL
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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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