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|
############################################################################
#
# File: chkhtml.icn
#
# Subject: Program to check HTML files
#
# Author: Robert J. Alexander
#
# Date: November 15, 1994
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Program to check an HTML file.
#
# Errors detected:
#
# - Reference to undefined anchor name.
# - Duplicated anchor name.
# - Warning for unreferenced anchor name.
# - Unknown tag.
# - Badly formed tag.
# - Improper tag nesting.
# - Unescaped <, >, ", or &.
# - Bad escape string.
# - Improper embedding of attributes.
# - Bad (non-ascii) characters
#
# Advises on:
# - Use of <HTML>, <HEAD, <BODY> tags.
#
procedure Usage(s)
write(&errout,\s)
stop(
"Usage: ChkHTML -options file..._
\n -u supress warnings for unreferenced anchor names_
\n -q supress errors for \"\\\"\" (quote) character in open text_
\n -g supress errors for \">\" character in open text_
\n -l n level of HTML (default 2)")
end
global SupressUnrefNames,SupressOpenQuot,SupressOpenGT,HTMLLevel
procedure Init(arg)
local opt,f
ListTypes := ["UL","OL","MENU","DIR"]
opt := options(arg,"uqgl+",Usage)
if *arg = 0 then Usage()
SupressUnrefNames := opt["u"]
SupressOpenQuot := opt["q"]
SupressOpenGT := opt["g"]
HTMLLevel := \opt["l"] | 2
return opt
end
link options
global FileName,LineNbr,TagStack,HRefList,NameSet,NameRefSet,ErrorCount,
SeenSet,PlainText,Tagless,Msg,ListTypes
procedure main(arg)
SetMsg()
Init(arg)
every CheckHTML(!arg)
end
procedure CheckHTML(fn)
local f,line,c
static badChars,scanChars
initial {
badChars := ~(&cset[33:128] ++ '\t')
scanChars := '<>"&' ++ badChars
}
#
# Open the input file.
#
f := open(fn) | {
write(&errout,"Can't open \"",fn,"\"")
fail
}
FileName := fn
write(&errout)
Msg("Checking HTML format...")
ErrorCount := 0
LineNbr := 0
TagStack := []
NameSet := set()
NameRefSet := set()
HRefList := []
SeenSet := set()
PlainText := &null
while line := read(f) do line ? {
LineNbr +:= 1
while tab(upto(scanChars)) do {
case c := move(1) of {
"<": ProcessTag(f) | break
">": if /Tagless & /SupressOpenGT then Error("\">\" in open text")
"\"": if /Tagless & /SupressOpenQuot then Error("\"\\\"\" (quote) in open text")
"&": if /Tagless then ProcessEscape() | Error("\"&\" in open text")
default: Error("Bad character: ",image(c))
}
}
}
close(f)
CheckStack()
CheckHRefs()
FileName := fn
LineNbr := &null
GiveAdvice()
Msg((if ErrorCount > 0 then string(ErrorCount) else "No")
," error",(if ErrorCount = 1 then "" else "s"),
" detected")
return
end
procedure CheckHRefs()
local x
every x := !HRefList do {
if not member(NameSet,x.value) then {
FileName := x.fileName
LineNbr := x.lineNbr
Error("Anchor name referenced but not defined: ",image(x.value))
}
}
if /SupressUnrefNames then {
LineNbr := &null
every x := !(NameSet -- NameRefSet) do {
Msg("Warning: Anchor name not referenced: ",image(x))
}
}
return
end
procedure CheckStack()
local tag
every tag := pop(TagStack) do
Error(pop(TagStack),"Unterminated tag: <",tag,">")
return
end
procedure ProcessTag(f)
local tag,subLine,upTag,endFlag,popCount,tagLines,listType
#
# Scan to the end of the tag (which might be multiple lines).
#
tag := ""
tagLines := 0
if ="!--" then {
#
# Comment tag.
#
until tab(find("-->") + 3) do {
&subject := read(f) | {
Error("Unclosed HTML comment (\"<!--\")")
LineNbr +:= tagLines
fail
}
tagLines +:= 1
}
LineNbr +:= tagLines
return
}
until tag ||:= tab(find(">")) do {
(*tag < 1000 & subLine := read(f)) | {
Error("Unclosed \"<\"")
LineNbr +:= tagLines
fail
}
tagLines +:= 1
tag ||:= tab(0) || " "
&subject := subLine
}
move(1)
#
# Scan the tag contents.
#
tag ? {
Space()
endFlag := ="/"
tag := tab(upto(' \t>') | 0)
upTag := Up(tag)
Space()
if \endFlag then {
#
# Process closer tag </...>.
#
if tag == "PLAINTEXT" then {
Error("<PLAINTEXT> should not have a </PLAINTEXT> tag")
PlainText := Tagless := &null
}
else {
#
# Check that the tag closes a matching opening tag.
#
CheckTag(upTag,,"no/")
if tag == ("LISTING" | "PRE") then Tagless := &null
popCount := 2
if not (TagStack[1] == upTag) then {
Error("Mismatched closing tag </",upTag,"> pairs with <",
TagStack[1],"> in line ",TagStack[2])
#
# Try to minimize cascading errors.
#
popCount :=
if TagStack[3] == upTag then 4
else if TagStack[5] == upTag then 6
else 0
}
every 1 to popCount do pop(TagStack)
}
}
else {
#
# Process non-closing tag.
#
insert(SeenSet,upTag)
if HTMLLevel = 1 then case upTag of {
#
# Tags for HTML 1.
#
# Tags handled specially.
#
"A": ProcessATag()
"IMG": CheckTag(upTag,"SRC*ALIGN+(TOP,BOTTOM,MIDDLE)ALT+ISMAP-","no/")
"NEXTID": CheckTag(upTag,"N+","no/")
"DL": CheckTag(upTag,"COMPACT-")
"LINK": CheckTag(upTag,"REL+REV+HREF+","no/")
"FORM": CheckTag(upTag,"FORM#ACTION*METHOD+(POST,GET)")
"INPUT": CheckTag(upTag,
"FORM@TYPE+(TEXT,CHECKBOX,RADIO,SUBMIT,RESET)NAME+VALUE+CHECKED-_
SIZE+MAXLENGTH+","no/")
"SELECT": CheckTag(upTag,"FORM@NAME+SIZE+MULTIPLE-")
"OPTION": CheckTag(upTag,"FORM@SELECTED-","no/")
"TEXTAREA": CheckTag(upTag,"FORM@NAME+ROWS+COLS+")
"DT" | "DD": CheckTag(upTag,"DL@","no/")
"LI": CheckTag(upTag,"list@","no/")
#
# Things that can't be inside character style tags or <A>.
#
"HTML" | "HEAD" | "TITLE" | "BODY" |
"H1" | "H2" | "H3" | "H4" | "H5" | "H6" |
"DL" | "UL" | "OL" | "MENU" | "DIR" |
"ADDRESS" | "BLOCKQUOTE" | "PRE" | "PRE" |
"FORM" | "SELECT" | "TEXTAREA": CheckTag(upTag,"char#A#")
"LISTING" | "XMP": {CheckTag(upTag,"char#A#"); Tagless := "true"}
#
# Character style tags.
#
"EM" | "STRONG" | "B" | "I" | "U" |
"VAR" | "CODE" | "DFN" | "CITE" | "KBD" | "SAMP" | "TT":
CheckTag(upTag,"char#")
#
# Valueless tags that can appear anywhere.
#
"P" | "BR" | "HR" | "OPTION" | "ISINDEX": CheckTag(upTag,,"no/")
"PLAINTEXT": {
CheckTag(upTag,,"no/")
PlainText := Tagless := "true"
}
default: Error("Unknown tag: <",upTag,if pos(0) then "" else " ",
tab(0),">")
}
else case upTag of {
#
# Tags for HTML 2.
#
# Tags handled specially.
#
"A": ProcessATag()
"IMG": CheckTag(upTag,
"SRC*_
ALIGN+(LEFT,RIGHT,TOP,TEXTTOP,MIDDLE,ABSMIDDLE,BASELINE,_
BOTTOM,ABSBOTTOM)_
WIDTH+HEIGHT+BORDER+VSPACE+HSPACE+ALT+ISMAP-","no/")
"NEXTID": CheckTag(upTag,"N+","no/")
"DL": CheckTag(upTag,"COMPACT-")
"LINK": CheckTag(upTag,"REL+REV+HREF+","no/")
"ISINDEX": CheckTag(upTag,"PROMPT-","no/")
"FORM": CheckTag(upTag,"FORM#ACTION*METHOD+(POST,GET)")
"INPUT": CheckTag(upTag,
"FORM@TYPE+(TEXT,CHECKBOX,RADIO,SUBMIT,RESET)NAME+VALUE+CHECKED-_
SIZE+MAXLENGTH+","no/")
"SELECT": CheckTag(upTag,"FORM@NAME+SIZE+MULTIPLE-")
"OPTION": CheckTag(upTag,"FORM@SELECTED-","no/")
"TEXTAREA": CheckTag(upTag,"FORM@NAME+ROWS+COLS+")
"DT" | "DD": CheckTag(upTag,"DL@","no/")
"LI": {
listType := !TagStack == !ListTypes
CheckTag(upTag,case listType of {
"UL": "list@TYPE+(DISC,CIRCLE,SQUARE)"
"OL": "list@TYPE+(A,I,1)VALUE+"
default: "list@"
},"no/")
}
"HR": CheckTag(upTag,"SIZE+WIDTH+ALIGN+(LEFT,RIGHT,CENTER)NOSHADE-","no/")
"UL": CheckTag(upTag,"TYPE+(DISC,CIRCLE,SQUARE)")
"OL": CheckTag(upTag,"TYPE+(A,I,1)START+")
"BR": CheckTag(upTag,"CLEAR+(LEFT,RIGHT,ALL)","no/")
"NOBR" | "CENTER": CheckTag(upTag)
"WBR": CheckTag(upTag,"NOBR@","no/")
"FONT": CheckTag(upTag,"SIZE+")
"BASEFONT": CheckTag(upTag,"SIZE+","no/")
#
# Things that can't be inside character style tags or <A>.
#
"HTML" | "HEAD" | "TITLE" | "BODY" |
"H1" | "H2" | "H3" | "H4" | "H5" | "H6" |
"DL" | "MENU" | "DIR" |
"ADDRESS" | "BLOCKQUOTE" | "PRE" | "PRE" |
"FORM" | "SELECT" | "TEXTAREA": CheckTag(upTag,"char#A#")
"LISTING" | "XMP": {CheckTag(upTag,"char#A#"); Tagless := "true"}
#
# Character style tags.
#
"EM" | "STRONG" | "B" | "I" | "U" |
"VAR" | "CODE" | "DFN" | "CITE" | "KBD" | "SAMP" | "TT":
CheckTag(upTag)
#
# Valueless tags that can appear anywhere.
#
"P" | "OPTION": CheckTag(upTag,,"no/")
"PLAINTEXT": {
CheckTag(upTag,,"no/")
PlainText := Tagless := "true"
}
default: Error("Unknown tag: <",upTag,if pos(0) then "" else " ",
tab(0),">")
}
}
}
LineNbr +:= tagLines
return
end
record HRefRec(fileName,lineNbr,value)
procedure ProcessATag()
local attrTable,value,ok
if attrTable := CheckTag("A","HREF+NAME+REL+REV+URN+TITLE+METHODS") then {
if value := \attrTable["HREF"] then {
if match("#",value) then {
value := Up(value[2:0])
insert(NameRefSet,value)
if not member(NameSet,value) then {
put(HRefList,HRefRec(FileName,LineNbr,value))
}
}
ok := "yes"
}
if value := \attrTable["NAME"] then {
value := Up(value)
if member(NameSet,value) then {
Error("Duplicate anchor name: ",image(value))
}
else {
insert(NameSet,value)
}
ok := "yes"
}
if /ok then Error("Either \"HREF\" or \"NAME\" attribute required for <A> tag")
}
return
end
procedure CheckTag(tag,template,noCloser)
#
# separators:
# + optional, with value
# - optional, no value
# * required, with value
# @ must be in specified context
# # must not be inspecified context
#
local attrTable,attr,origAttrs,c,error,value,valueList,valueString
attrTable := ScanAttrs()
origAttrs := copy(attrTable)
\template ? {
while attr := tab(upto('+-*@#')) do {
case c := move(1) of {
!"+*": {
#
# Process an attribute with a value.
# Scan allowed value set, if any.
#
if ="(" then {
valueList := []
repeat {
put(valueList,tab(upto(',)')))
c := move(1)
if c == ")" then break
}
}
else valueList := &null
#
# See if an attribute of the specified name (with a value)
# exists.
#
if value := \attrTable[attr] then {
delete(attrTable,attr)
if \valueList then {
if not (Up(value) == !valueList) then {
valueString := ""
every valueString ||:= " " || image(!valueList)
Error("Invalid value for attribute ",image(attr)," of tag <",
tag,">: ",image(value),
"\n # must be one of: ",valueString)
}
}
}
else if c == "*" then {
#
# Attr not there -- see if it is required.
#
Error("Attribute ",image(attr),", required for tag <",tag,">, is missing")
error := "yes"
}
}
"-": {
#
# Process an atribute with no value.
#
if member(attrTable,attr) then {
delete(attrTable,attr)
if \attrTable[attr] then {
Error("A value not expected for attribute: ",image(attr),
"of tag <",tag,">")
error := "yes"
}
}
}
"@": CheckContext(attr,tag)
"#": CheckContext(attr,tag,"notInContext")
}
}
}
every attr := key(attrTable) do {
Error("Unknown attribute ",image(attr)," of tag <",tag,">")
error := "yes"
}
if /noCloser then push(TagStack,LineNbr,tag)
return if /error then origAttrs
end
procedure ScanAttrs()
local attr,value,attrTable
attrTable := table()
until pos(0) do {
attr := Up(tab(upto(' \t=') | 0))
Space()
if ="=" then {
Space()
(="\"" & value := tab(find("\"")) & move(1)) |
(value := tab(upto(' \t') | 0))
Space()
}
else value := &null
attrTable[attr] := value
}
return attrTable
end
procedure CheckContext(context,tag,notInContext)
local tags,inContext,sep
static canned
initial {
canned := table()
canned["list"] := ListTypes
canned["char"] := ["EM","STRONG","B","I","U",
"VAR","CODE","DFN","CITE","KBD","SAMP","TT"]
}
inContext :=
(if context := \canned[context] then !context else context) == !TagStack
if \notInContext then inContext := if \inContext then &null else "true"
if \inContext then return
else {
if type(context) ~== "string" then {
tags := sep := ""
every tags ||:= sep || !canned do sep := " or "
context := tags
}
if \notInContext then
Error("<",tag,"> should not be inside <",context,">")
else
Error("<",tag,"> out of context; should be inside <",context,">")
}
end
procedure ProcessEscape()
local escape
static escSet,escChars
initial {
escChars := &letters ++ &digits
escSet := set([
"quot",
"lt",
"gt",
"amp",
"nbsp",
"reg",
"copy",
"AElig",
"Aacute",
"Acirc",
"Agrave",
"Aring",
"Atilde",
"Auml",
"Ccedil",
"ETH",
"Eacute",
"Ecirc",
"Egrave",
"Euml",
"Iacute",
"Icirc",
"Igrave",
"Iuml",
"Ntilde",
"Oacute",
"Ocirc",
"Ograve",
"Oslash",
"Otilde",
"Ouml",
"THORN",
"Uacute",
"Ucirc",
"Ugrave",
"Uuml",
"Yacute",
"aacute",
"acirc",
"aelig",
"agrave",
"aring",
"atilde",
"auml",
"ccedil",
"eacute",
"ecirc",
"egrave",
"eth",
"euml",
"iacute",
"icirc",
"igrave",
"iuml",
"ntilde",
"oacute",
"ocirc",
"ograve",
"oslash",
"otilde",
"ouml",
"szlig",
"thorn",
"uacute",
"ucirc",
"ugrave",
"uuml",
"yacute",
"yuml"])
if HTMLLevel = 1 then every delete(escSet,"reg" | "copy")
}
(escape := tab(many(escChars)) & =";") | fail
(escape ? (="#",tab(many(&digits)),pos(0))) | member(escSet,escape) | {
Error("Unknown escape string: &",escape,";")
}
return
end
procedure GiveAdvice()
if not member(SeenSet,"HTML") then
Msg("Advice: File should be bracketed with <HTML>...</HTML> tags")
if not (member(SeenSet,"HEAD"),member(SeenSet,"BODY")) then {
if member(SeenSet,"HEAD") then
Error("<HEAD>, but no <BODY>")
else if member(SeenSet,"BODY") then
Error("<BODY>, but no <HEAD>")
else
Msg("Advice: Consider using <HEAD>...</HEAD> <BODY>...</BODY>")
}
return
end
link shquote
procedure SetMsg()
return Msg := (if &host == "Macintosh MPW" then MPWMsg else UnixMsg)
end
procedure UnixMsg(s[])
local lineNbr
lineNbr := if type(s[1]) == "integer" then get(s) else LineNbr
writes(&errout,"\"",FileName,"\"",":" || \lineNbr | "",": ")
every writes(&errout,!s)
write(&errout)
return
end
procedure MPWMsg(s[])
local lineNbr
lineNbr := if type(s[1]) == "integer" then get(s) else LineNbr
writes(&errout,"File ",mpwquote(FileName),"; Line ",\lineNbr | "¤"," # ")
every writes(&errout,!s)
write(&errout)
return
end
procedure Error(s[])
ErrorCount +:= 1
return Msg!s
end
procedure Space()
suspend tab(many(' \t'))
end
procedure Up(s)
static lcase,ucase
initial {
lcase := string(&lcase)
ucase := string(&ucase)
}
return map(s,lcase,ucase)
end
|
