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|
# pbjparse.awk
##
# Parse a PBJ data file and print a PBDATA datafile to STDOUT.
# Justin Davis <jrcd83@gmail.com>
BEGIN {
templcount = 0 # number of templates that will be in the templates array
PROG = "pbjparse"
}
{ parsepbj() }
END {
tcmd = ""
if (templcount > 0) {
tcmd = templates[1]
for (i=2; i<=templcount; i++) tcmd = tcmd "|" templates[i]
}
else tcmd = "cat"
for (dblkey in pbvars) {
split(dblkey, keys, SUBSEP)
if (keys[2] != "len") continue
name = keys[1]
len = pbvars[dblkey]
print name | tcmd
for (i=1; i<=len; i++) print pbvars[name,i] | tcmd
print "" | tcmd
}
if (optdepcount > 0) {
print "optdepends" | tcmd
for (name in optdeps) print optdeps[name] | tcmd
print "" | tcmd
}
if (!seenpkgr) print "packager\n" packager "\n\n" | tcmd
}
function parsepbj ( cmd) # cmd is a "local" var
{
# Ignore comments.
sub(/#.*/, "")
# Optdeps are special. In an annoying way.
if ($1 == "+") {
if ($2 == "optdepends") {
msg = joinfields(3)
++optdepcount
name = optdepname($3)
optdeps[name] = msg
remdep("depends", name)
remdep("makedepends", name)
remdep("checkdepends", name)
}
else {
# We print the default packager if none was seen.
pushval($2, joinfields(3))
}
}
else if ($1 == "-") {
if ($2 == "optdepends")
die("cannot delete an optdep once it is created.")
if (! remval($2, $3))
die("could not find " $3 " in " $2 "'s values")
}
else if ($1 == "=") {
if ($2 == "optdepends") die("cannot use '=' with optdepends.")
remall($2)
for (i=3; i<=NF; i++) pushval($2, $i)
}
else if ($1 == "!") {
cmd = joinfields(2)
while ((ret = cmd | getline) > 0) parsepbj()
if (ret == -1) die("failed to run $cmd")
close(cmd)
}
else if ($1 == "|") {
tcmd = joinfields(2)
templates[++templcount] = tcmd
}
else if ($1 ~ /^[ \t]*$/) ; # ignore lines of whitespace
else die("invalid input: " $0)
}
function die (msg)
{
printf "%s: error: %s:%d %s\n", PROG, FILENAME, FNR, msg | "cat 1>&2"
exit 1
}
function joinfields (start, msg)
{
msg = $(start++)
while (start <= NF) msg = msg " " $(start++)
return msg
}
function remall (field)
{
pbvars[field, "len"] = 0
}
function pushval (field, val)
{
if (field == "packager") seenpkgr = 1
pbvars[$2, ++pbvars[field, "len"]] = val
}
function remval (field, prefix)
{
len = pbvars[field, "len"]
if (len == 0) return 0
for (i=1; i<=len; i++)
if (pbvars[field, i] ~ "^" prefix) break
if (i > len) return 0
while (i < len) { pbvars[field, i] = pbvars[field, i+1]; i++ }
delete pbvars[field, i]
pbvars[field, "len"]--
return 1
}
function optdepname (msgbeg)
{
if (! match(msgbeg, "^[a-z_-]+:$"))
die("bad optdepends name: " msgbeg)
return substr(msgbeg, 1, RLENGTH-1)
}
|
