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header "Extensions and Variations of IMP"
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theory Procs imports BExp begin
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subsection "Procedures and Local Variables"
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type_synonym pname = string
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datatype
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com = SKIP
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| Assign vname aexp ("_ ::= _" [1000, 61] 61)
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| Seq com com ("_;/ _" [60, 61] 60)
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| If bexp com com ("(IF _/ THEN _/ ELSE _)" [0, 0, 61] 61)
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| While bexp com ("(WHILE _/ DO _)" [0, 61] 61)
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| Var vname com ("(1{VAR _;;/ _})")
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| Proc pname com com ("(1{PROC _ = _;;/ _})")
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| CALL pname
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definition "test_com =
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{VAR ''x'';;
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{PROC ''p'' = ''x'' ::= N 1;;
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{PROC ''q'' = CALL ''p'';;
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{VAR ''x'';;
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''x'' ::= N 2;
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{PROC ''p'' = ''x'' ::= N 3;;
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CALL ''q''; ''y'' ::= V ''x''}}}}}"
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end
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