56 lines
1.6 KiB
Plaintext
56 lines
1.6 KiB
Plaintext
Language "IBAFlang"
|
|
|
|
# Statements
|
|
|
|
Syntax Stmt: statement ::= '{' statement* '}'
|
|
| 'print' '(' exp ')' ';'
|
|
| id ';'
|
|
| id '=' exp ';'
|
|
| 'return' exp? ';'
|
|
| 'fun' id '(' ')' '{' statement* '}'
|
|
|
|
Semantics execute[[ Stmt*:statement* ]] : => null-type
|
|
|
|
Rule execute[[ '{' Stmt* '}' ]] = scope(collateral(collect-declared-vars[[ Stmt* ]]), execute[[ Stmt* ]])
|
|
Rule execute[[ 'print' '(' Exp ')' ';' ]] = print eval-exp[[ Exp ]]
|
|
Rule execute[[ Id ';' ]] = assign(bound id[[ Id ]], 0)
|
|
Rule execute[[ Id '=' Exp ';' ]] = assign(bound id[[ Id ]], eval-exp[[ Exp ]])
|
|
Rule execute[[ 'return' Exp ';' ]] = return eval-exp[[ Exp ]]
|
|
Rule execute[[ 'return' ';' ]] = return null
|
|
Rule execute[[ 'fun' Id '(' ')' '{' Stmt* '}' ]] = null
|
|
|
|
Rule execute[[ ]] = null
|
|
Rule execute[[ Stmt Stmt+ ]] = sequential(execute[[ Stmt ]], execute[[ Stmt+ ]])
|
|
|
|
|
|
|
|
|
|
# Handling variable declarations
|
|
|
|
Semantics collect-declared-vars[[ Stmt*:statement* ]] : (=>environments)+
|
|
|
|
Rule collect-declared-vars[[ Id '=' Exp ';' ]] = bind(id[[ Id ]],
|
|
allocate-variable(integers)
|
|
)
|
|
Rule collect-declared-vars[[ Id ';' ]] = bind(id[[ Id ]],
|
|
allocate-variable(integers)
|
|
)
|
|
Rule collect-declared-vars[[ 'fun' Id '(' ')' '{' Stmt* '}' ]] = bind(id[[ Id ]],
|
|
function abstraction(execute[[ '{' Stmt* '}' ]])
|
|
)
|
|
Rule collect-declared-vars[[ ]] = map()
|
|
Rule collect-declared-vars[[ Stmt ]] = map()
|
|
Rule collect-declared-vars[[ Stmt1 Stmt2 Stmt* ]] = collect-declared-vars[[ Stmt1 ]], collect-declared-vars[[ Stmt2 ]], collect-declared-vars[[ Stmt* ]]
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|