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include defs
# IFERRC - Generate initial code for an IFERR statement. Used to provide
# error recovery for a statement or compound statement.
subroutine iferrc (lab, sense)
integer lab, sense
integer labgen, nlpar
character t, gettok, gnbtok, token(MAXTOK)
include COMMON_BLOCKS
string errpsh "call xerpsh"
string siferr "if (.not.xerpop()) "
string sifnoerr "if (xerpop()) "
xfer = NO
lab = labgen (3)
call outtab # "call errpsh"
call outstr (errpsh)
call outdon
switch (gnbtok (token, MAXTOK)) { # "iferr (" or "iferr {"
case LPAREN:
call outtab
case LBRACE:
call pbstr (token)
esp = esp + 1
if (esp >= MAXERRSTK) # not likely
call baderr ("Iferr statements nested too deeply.")
errstk(esp) = lab
return
default:
call synerr ("Missing left paren.")
return
}
nlpar = 1 # process "iferr (.."
token(1) = EOS
# Push handler on error stack temporarily so that "iferr (call error.."
# can be handled properly.
esp = esp + 1
if (esp >= MAXERRSTK) # not likely
call baderr ("Iferr statements nested too deeply.")
errstk(esp) = 0
repeat { # output the statement
call outstr (token)
t = gettok (token, MAXTOK)
if (t == SEMICOL | t == LBRACE | t == RBRACE | t == EOF) {
call pbstr (token)
break
}
if (t == NEWLINE) # delete newlines
token (1) = EOS
else if (t == LPAREN)
nlpar = nlpar + 1
else if (t == RPAREN)
nlpar = nlpar - 1
else if (t == SEMICOL) {
call outdon
call outtab
} else if (t == ALPHA)
call squash (token)
# else nothing special
} until (nlpar <= 0)
esp = esp - 1
ername = NO # ignore errchk
if (nlpar != 0)
call synerr ("Missing parenthesis in condition.")
else
call outdon
call outtab # "if (errpop())"
if (sense == 1)
call outstr (siferr)
else
call outstr (sifnoerr)
call outgo (lab) # "... goto lab"
call indent (1)
return
end
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