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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 {
if (templcount > 0) {
tcmd = templates[1]
for (i=2; i<=templcount; i++) tcmd = tcmd "|" templates[i]
}
else tcmd = "cat"
for (name in pbcount) {
len = pbcount[name]
if (len == 0) continue
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) {
pkger = ENVIRON["PACKAGER"]
if (pkger == "") pkger = "Anonymous"
print "packager\n" pkger | 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
}
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.")
remval($2, $3)
}
else if ($1 == "<") {
i = findval($2, $3)
stack[++stacklen] = pbvars[$2, i]
remelem($2, i)
}
else if ($1 == ">") {
if (stacklen < 1)
die("No values on the stack. Make sure you used '<' first.")
pushval($2, stack[stacklen--])
}
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 == "|") {
templates[++templcount] = joinfields(2)
}
else if ($1 ~ /^[ \t]*$/) ; # ignore lines of whitespace
else die("invalid input: " $0)
}
function die (msg)
{
printf "%s: error line %d: %s\n", PROG, FNR, msg | "cat 1>&2"
exit 1
}
function joinfields (start, msg)
{
msg = $(start++)
while (start <= NF) msg = msg " " $(start++)
return msg
}
function remall (field)
{
pbcount[field] = 0
}
function pushval (field, val)
{
if (field == "packager") seenpkgr = 1
pbvars[field, ++pbcount[field]] = val
}
function remval (field, prefix)
{
remelem(field, findval(field, prefix))
}
function remelem (field, i, len)
{
# TODO: error check if "i" is in bounds?
len = pbcount[field]
for (len = pbcount[field]; i < len; i++)
pbvars[field, i] = pbvars[field, i+1]
delete pbvars[field, i]
pbcount[field]--
}
function findval (field, prefix, i, len)
{
len = pbcount[field]
if (len == 0) die(field " is empty!")
for (i=1; i<=len; i++) if (pbvars[field, i] ~ "^" prefix) break
if (i > len) die("could not find " prefix " in " field "'s values")
return i
}
function optdepname (msgbeg)
{
if (! match(msgbeg, "^[a-z_-]+:$"))
die("bad optdepends name: " msgbeg)
return substr(msgbeg, 1, RLENGTH-1)
}
|
