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|
(*
* Xml Light, an small Xml parser/printer with DTD support.
* Copyright (C) 2003 Nicolas Cannasse (ncannasse@motion-twin.com)
* Copyright (C) 2003 Jacques Garrigue
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
open Printf
type xml =
| Element of (string * (string * string) list * xml list)
| PCData of string
type error_pos = {
eline : int;
eline_start : int;
emin : int;
emax : int;
}
type error_msg =
| UnterminatedComment
| UnterminatedString
| UnterminatedEntity
| IdentExpected
| CloseExpected
| NodeExpected
| AttributeNameExpected
| AttributeValueExpected
| EndOfTagExpected of string
| EOFExpected
type error = error_msg * error_pos
exception Error of error
exception File_not_found of string
type t = {
mutable check_eof : bool;
mutable concat_pcdata : bool;
}
type source =
| SFile of string
| SChannel of in_channel
| SString of string
| SLexbuf of Lexing.lexbuf
type state = {
source : Lexing.lexbuf;
stack : Xml_lexer.token Stack.t;
xparser : t;
}
exception Internal_error of error_msg
exception NoMoreData
let xml_error = ref (fun _ -> assert false)
let file_not_found = ref (fun _ -> assert false)
let _raises e f =
xml_error := e;
file_not_found := f
let make () =
{
check_eof = true;
concat_pcdata = true;
}
let check_eof p v = p.check_eof <- v
let concat_pcdata p v = p.concat_pcdata <- v
let pop s =
try
Stack.pop s.stack
with
Stack.Empty ->
Xml_lexer.token s.source
let push t s =
Stack.push t s.stack
let rec read_node s =
match pop s with
| Xml_lexer.PCData s -> PCData s
| Xml_lexer.Tag (tag, attr, true) -> Element (tag, attr, [])
| Xml_lexer.Tag (tag, attr, false) -> Element (tag, attr, read_elems ~tag s)
| t ->
push t s;
raise NoMoreData
and
read_elems ?tag s =
let elems = ref [] in
(try
while true do
match s.xparser.concat_pcdata , read_node s , !elems with
| true , PCData c , (PCData c2) :: q ->
elems := PCData (sprintf "%s\n%s" c2 c) :: q
| _ , x , l ->
elems := x :: l
done
with
NoMoreData -> ());
match pop s with
| Xml_lexer.Endtag s when Some s = tag -> List.rev !elems
| Xml_lexer.Eof when tag = None -> List.rev !elems
| t ->
match tag with
| None -> raise (Internal_error EOFExpected)
| Some s -> raise (Internal_error (EndOfTagExpected s))
let read_xml s = read_node s
let convert = function
| Xml_lexer.EUnterminatedComment -> UnterminatedComment
| Xml_lexer.EUnterminatedString -> UnterminatedString
| Xml_lexer.EIdentExpected -> IdentExpected
| Xml_lexer.ECloseExpected -> CloseExpected
| Xml_lexer.ENodeExpected -> NodeExpected
| Xml_lexer.EAttributeNameExpected -> AttributeNameExpected
| Xml_lexer.EAttributeValueExpected -> AttributeValueExpected
| Xml_lexer.EUnterminatedEntity -> UnterminatedEntity
let do_parse xparser source =
try
Xml_lexer.init source;
let s = { source = source; xparser = xparser; stack = Stack.create(); } in
let x = read_xml s in
if xparser.check_eof && pop s <> Xml_lexer.Eof then raise (Internal_error EOFExpected);
Xml_lexer.close source;
x
with
| NoMoreData ->
Xml_lexer.close source;
raise (!xml_error NodeExpected source)
| Internal_error e ->
Xml_lexer.close source;
raise (!xml_error e source)
| Xml_lexer.Error e ->
Xml_lexer.close source;
raise (!xml_error (convert e) source)
let parse p = function
| SChannel ch -> do_parse p (Lexing.from_channel ch)
| SString str -> do_parse p (Lexing.from_string str)
| SLexbuf lex -> do_parse p lex
| SFile fname ->
let ch = (try open_in fname with Sys_error _ -> raise (!file_not_found fname)) in
try
let x = do_parse p (Lexing.from_channel ch) in
close_in ch;
x
with
e ->
close_in ch;
raise e
let error_msg = function
| UnterminatedComment -> "Unterminated comment"
| UnterminatedString -> "Unterminated string"
| UnterminatedEntity -> "Unterminated entity"
| IdentExpected -> "Ident expected"
| CloseExpected -> "Element close expected"
| NodeExpected -> "Xml node expected"
| AttributeNameExpected -> "Attribute name expected"
| AttributeValueExpected -> "Attribute value expected"
| EndOfTagExpected tag -> sprintf "End of tag expected : '%s'" tag
| EOFExpected -> "End of file expected"
let error (msg,pos) =
if pos.emin = pos.emax then
sprintf "%s line %d character %d" (error_msg msg) pos.eline (pos.emin - pos.eline_start)
else
sprintf "%s line %d characters %d-%d" (error_msg msg) pos.eline (pos.emin - pos.eline_start) (pos.emax - pos.eline_start)
let line e = e.eline
let range e =
e.emin - e.eline_start , e.emax - e.eline_start
let abs_range e =
e.emin , e.emax
let pos source =
let line, lstart, min, max = Xml_lexer.pos source in
{
eline = line;
eline_start = lstart;
emin = min;
emax = max;
}
|
