def StmtWhile():
yield ps.token(TOKEN.WHILE)
yield ps.token(TOKEN.PAR_OPEN)
condition = yield Exp
yield ps.token(TOKEN.PAR_CLOSE)
yield ps.token(TOKEN.CURL_OPEN)
contents = yield ps.many(Stmt)
yield ps.token(TOKEN.CURL_CLOSE)
return AST.LOOP(init=None, cond=condition, update=None, stmts=contents)
def StmtFor():
yield ps.token(TOKEN.FOR)
yield ps.token(TOKEN.PAR_OPEN)
initial = yield ps.times(ActStmt, 0, 1)
initial = initial[0] if len(initial) > 0 else None
yield ps.token(TOKEN.SEMICOLON)
condition = yield ps.times(Exp, 0, 1)
condition = condition[0] if len(condition) > 0 else None
yield ps.token(TOKEN.SEMICOLON)
update = yield ps.times(ActStmt, 0, 1)
update = update[0] if len(update) > 0 else None
yield ps.token(TOKEN.PAR_CLOSE)
yield ps.token(TOKEN.CURL_OPEN)
contents = yield ps.many(Stmt)
yield ps.token(TOKEN.CURL_CLOSE)
return AST.LOOP(init=initial,
cond=condition,
update=update,
stmts=contents)
AST.LOOP(
init=AST.ACTSTMT(val=AST.ASSIGNMENT(
varref=AST.VARREF(id=Token(None, TOKEN.IDENTIFIER,
"x"),
fields=[]),
expr=AST.DEFERREDEXPR(
contents=[Token(None, TOKEN.IDENTIFIER, "x")
]))),
cond=AST.DEFERREDEXPR(contents=[
Token(None, TOKEN.IDENTIFIER, "x"),
Token(None, TOKEN.OP_IDENTIFIER, "=="),
Token(None, TOKEN.IDENTIFIER, "y")
]),
update=AST.FUNCALL(id=Token(None, TOKEN.IDENTIFIER,
"f"),
kind=FunKind.FUNC,
args=[]),
stmts=[
AST.STMT(
val=AST.RETURN(expr=None)),
AST.STMT(val=AST.IFELSE(condbranches=[
AST.CONDBRANCH(expr=AST.DEFERREDEXPR(contents=[
Token(None, TOKEN.IDENTIFIER, "x"),
Token(None, TOKEN.OP_IDENTIFIER, "=="),
Token(None, TOKEN.IDENTIFIER, "y")
]),
stmts=[
AST.STMT(val=AST.RETURN(
expr=None))
]),
AST.CONDBRANCH(expr=AST.DEFERREDEXPR(contents=[
Token(None, TOKEN.IDENTIFIER, "x"),
Token(None, TOKEN.OP_IDENTIFIER, "=="),
Token(None, TOKEN.IDENTIFIER, "y")
]),
stmts=[
AST.STMT(val=AST.RETURN(
expr=None))
]),
AST.CONDBRANCH(expr=None,
stmts=[
AST.STMT(val=AST.RETURN(
expr=None))
])
]))
])
