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# dtdgport.awk
# Reads an XML document from standard input and
# prints a DTD for this document to standard output.
# http://saxon.sourceforge.net/dtdgen.html
# JK 2004-10-09
# JK 2006-03-05
# JK 2007-08-05 Converted for portability from the original dtd_generator.awk
# The program makes an internal list of all the elements
# and attributes that appear in your document, noting how
# they are nested, and noting which elements contain
# character data.
BEGIN {
while (getXMLEVENT(ARGV[1])) {
# Remember each element.
if ( XMLEVENT == "STARTELEM" ) {
# Remember the parent names of each child node.
name[XMLDEPTH] = XMLSTARTELEM
if (XMLDEPTH>1)
child[name[XMLDEPTH-1], XMLSTARTELEM] ++
# Count how often the element occurs.
elem[XMLSTARTELEM] ++
# Remember all the attributes with the element.
for (a in XMLATTR)
attr[XMLSTARTELEM,a] ++
}
}
}
END { print_elem(1, name[1]) } # name[1] is the root
# Print one element (including sub-elements) but only once.
function print_elem(depth, element, c, atn, chl, n, i, myChildren) {
if (already_printed[element]++)
return
indent=sprintf("%*s", 2*depth-2, "")
myChildren=""
for (c in child) {
split(c, chl, SUBSEP)
if (element == chl[1]) {
if (myChildren=="")
myChildren = chl[2]
else
myChildren = myChildren " | " chl[2]
}
}
# If an element has no child nodes, declare it as such.
if (myChildren=="")
print indent "<!ELEMENT", element , "( #PCDATA ) >"
else
print indent "<!ELEMENT", element , "(", myChildren, ")* >"
# After the element name itself, list its attributes.
for (a in attr) {
split(a, atn, SUBSEP)
# Treat only those attributes that belong to the current element.
if (element == atn[1]) {
# If an attribute occured each time with its element, notice this.
if (attr[element, atn[2]] == elem[element])
print indent "<!ATTLIST", element, atn[2], "CDATA #REQUIRED>"
else
print indent "<!ATTLIST", element, atn[2], "CDATA #IMPLIED>"
}
}
# Now go through the child nodes of this elements and print them.
gsub(/[\|]/, " ", myChildren)
n=split(myChildren, chl)
for(i=1; i<=n; i++) {
print_elem(depth+1, chl[i])
split(myChildren, chl)
}
}
##
# getXMLEVENT( file ): # read next xml-data into XMLEVENT,XMLNAME,XMLATTR
# # referenced entities are not resolved
# Parameters:
# file -- path to xml file
# External variables:
# XMLEVENT -- type of item read, e.g. "STARTELEM"(tag), "ENDELEM"(end tag),
# "COMMENT"(comment), "CHARDATA"(data)
# XMLNAME -- value of item, e.g. tagname if type is "STARTELEM" or "ENDELEM"
# XMLATTR -- Map of attributes, only set if XMLEVENT=="STARTELEM"
# XMLPATH -- Path to current tag, e.g. /TopLevelTag/SubTag1/SubTag2
# XMLROW -- current line number in input file
# XMLERROR -- error text, set on parse error
# Returns:
# 1 on successful read: XMLEVENT, XMLNAME, XMLATTR are set accordingly
# "" at end of file or parse error, XMLERROR is set on error
# Private Data:
# _XMLIO -- buffer, XMLROW, XMLPATH for open files
##
function getXMLEVENT( file ,end,p,q,tag,att,accu,mline,mode,S0,ex,dtd) {
XMLEVENT=XMLNAME=XMLERROR=XMLSTARTELEM=XMLENDELEM = ""
split("", XMLATTR)
S0 = _XMLIO[file,"S0"]
XMLROW = _XMLIO[file,"line"];
XMLPATH = _XMLIO[file,"path"];
XMLDEPTH=_XMLIO[file,"depth"]+0;
dtd = _XMLIO[file,"dtd"];
while (!XMLEVENT) {
if (S0 == "") {
if (1 != (getline S0 < file))
break;
XMLROW ++;
S0 = S0 RS;
}
if (mode == "") {
mline = XMLROW
accu=""
p = substr(S0,1,1)
if (p != "<" && !(dtd && p=="]"))
mode="CHARDATA"
else if (p == "]") {
S0 = substr(S0,2)
mode="ENDDOCT"
end=">"
dtd=0
} else if ( substr(S0,1,4) == "<!--" ) {
S0=substr(S0,5)
mode="COMMENT"
end="-->"
} else if ( substr(S0,1,9) == "<!DOCTYPE" ) {
S0 = substr(S0,10)
mode = "STARTDOCT"
end = ">"
} else if (substr(S0,1,9) == "<![CDATA[" ) {
S0 = substr(S0,10)
mode = "CDA"
end = "]]>"
} else if ( substr(S0,1,2) == "<!" ) {
S0 = substr(S0,3)
mode = "DEC"
end = ">"
} else if (substr(S0,1,2) == "<?") {
S0 = substr(S0,3)
mode = "PROCINST"
end = "?>"
} else if ( substr(S0,1,2)=="</" ) {
S0 = substr(S0,3)
mode = "ENDELEM"
end = ">";
tag = S0
sub(/[ \n\r\t>].*$/,"",tag)
S0 = substr(S0,length(tag)+1)
ex = XMLPATH
sub(/\/[^\/]*$/,"",XMLPATH)
ex = substr(ex, length(XMLPATH)+2)
if (tag != ex) {
XMLERROR = "unexpected close tag <" ex ">..</" tag ">"
break
}
} else {
S0 = substr(S0,2)
mode = "STARTELEM"
tag = S0
sub(/[ \n\r\t\/>].*$/,"",tag)
S0 = substr(S0, length(tag)+1)
if (tag !~ /^[A-Za-z:_][0-9A-Za-z:_.-]*$/ ) { # /^[[:alpha:]:_][[:alnum:]:_.-]*$/
XMLERROR = "invalid tag name '" tag "'"
break
}
XMLPATH = XMLPATH "/" tag;
}
} else if (mode == "CHARDATA") { # terminated by "<" or EOF
p = index(S0, "<")
if (dtd && (q=index(S0,"]")) && (!p || q<p) )
p = q
if (p) {
XMLEVENT = "CHARDATA"
XMLNAME = accu unescapeXML(substr(S0, 1, p-1))
S0 = substr(S0, p)
mode = ""
} else {
accu = accu unescapeXML(S0)
S0 = ""
}
} else if ( mode == "STARTELEM" ) {
sub(/^[ \n\r\t]*/,"",S0)
if (S0 == "")
continue
if (substr(S0, 1, 2) == "/>" ) {
S0 = substr(S0, 3)
mode = ""
XMLEVENT = "STARTELEM"
XMLNAME = XMLSTARTELEM = tag
XMLDEPTH ++
S0 = "</" tag ">" S0
} else if (substr(S0, 1, 1) == ">" ) {
S0 = substr(S0, 2)
mode = ""
XMLEVENT = "STARTELEM"
XMLNAME = XMLSTARTELEM = tag
XMLDEPTH ++
} else {
att = S0
sub(/[= \n\r\t\/>].*$/,"",att)
S0 = substr(S0, length(att) + 1)
mode = "ATTR"
if (att !~ /^[A-Za-z:_][0-9A-Za-z:_.-]*$/ ) { # /^[[:alpha:]:_][[:alnum:]:_.-]*$/
XMLERROR = "invalid attribute name '" att "'"
break
}
}
} else if (mode == "ATTR") {
sub(/^[ \n\r\t]*/, "", S0)
if (S0 == "")
continue
if (substr(S0,1,1) == "=" ) {
S0 = substr(S0,2)
mode = "EQ"
} else {
XMLATTR[att] = att
mode = "STARTELEM"
}
} else if (mode == "EQ") {
sub(/^[ \n\r\t]*/,"",S0)
if (S0 == "")
continue
end = substr(S0,1,1)
if (end == "\"" || end == "'") {
S0 = substr(S0,2)
accu = ""
mode = "VALUE"
} else {
accu = S0
sub(/[ \n\r\t\/>].*$/,"", accu)
S0 = substr(S0, length(accu)+1)
XMLATTR[att] = unescapeXML(accu)
mode = "STARTELEM"
}
} else if (mode == "VALUE") { # terminated by end
if (p = index(S0, end)) {
XMLATTR[att] = accu unescapeXML(substr(S0,1,p-1))
S0 = substr(S0, p+length(end))
mode = "STARTELEM"
} else {
accu = accu unescapeXML(S0)
S0=""
}
} else if (mode == "STARTDOCT") { # terminated by "[" or ">"
if ((q = index(S0, "[")) && (!(p = index(S0,end)) || q<p )) {
XMLEVENT = mode
XMLNAME = accu substr(S0, 1, q-1)
S0 = substr(S0, q+1)
mode = ""
dtd = 1
} else if (p = index(S0,end)) {
XMLEVENT = mode
XMLNAME = accu substr(S0, 1, p-1)
S0 = "]" substr(S0, p)
mode = ""
dtd = 1
} else {
accu = accu S0
S0 = ""
}
} else if (p = index(S0,end)) { # terminated by end
XMLEVENT = mode
XMLNAME = XMLENDELEM = ( mode=="ENDELEM" ? tag : accu substr(S0,1,p-1))
if (mode=="ENDELEM") XMLDEPTH --
S0 = substr(S0, p+length(end))
mode = ""
} else {
accu = accu S0
S0 = ""
}
}
_XMLIO[file, "S0"] = S0;
_XMLIO[file, "line"] = XMLROW;
_XMLIO[file, "path"] = XMLPATH;
_XMLIO[file, "depth"] = XMLDEPTH;
_XMLIO[file, "dtd"] = dtd;
if (mode == "CHARDATA") {
mode = ""
if (accu != "")
XMLEVENT = "CHARDATA"
XMLNAME = ""
$0 = accu
}
if (XMLEVENT) {
if (XMLEVENT == "STARTELEM") {
# Copy attributes into $0.
NF=0
for (ex in XMLATTR) {
NF ++
$NF = ex
}
}
return 1
}
close(file);
delete _XMLIO[file, "S0"];
delete _XMLIO[file, "line"];
delete _XMLIO[file, "path"];
delete _XMLIO[file, "depth"];
delete _XMLIO[file, "dtd"];
if (XMLERROR)
XMLERROR = file ":" XMLROW": " XMLERROR
else if (mode) XMLERROR=file ":" mline ": " "unterminated " mode
else if (XMLPATH) XMLERROR=file ":" XMLROW": " "unclosed tag(s) " XMLPATH
} # func. getXMLEVENT
# unescape data and attribute values, used by getXMLEVENT
function unescapeXML(text) {
gsub( "'", "'", text )
gsub( """, "\"", text )
gsub( ">", ">", text )
gsub( "<", "<", text )
gsub( "&", "\\&", text)
return text
}
# close xml file
function closeXMLEVENT(file) {
close(file);
delete _XMLIO[file,"S0"]
delete _XMLIO[file,"line"]
delete _XMLIO[file,"path"];
delete _XMLIO[file,"depth"];
delete _XMLIO[file,"dtd"]
delete _XMLIO[file,"open"]
delete _XMLIO[file,"IND"]
}
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