Script Library: 1213 scripts
 

xml-dom.r

REBOL [ Title: "XML/DOM" Date: 15-Dec-2008 Author: "Christopher Ross-Gill" Type: 'module Exports: [load-xml] Version: 0.1.2 File: %xml-dom.r Purpose: {A rudimentary in-memory XML interpreter and interface.} Notes: { Features: utilizes REBOL datatypes to represent XML structure; DOM methods for extraction; self-contained and works with /Base; prettified block structure. Caveat: destructive - discards whitespace and comments; does not preserve empty tags vs. matching tags with no content; NOT an implementation of W3 DOM, only a loosely inspired subset. ToDo: saving. } Library: [ Level: 'intermediate Platform: 'all Type: [module dialect function] Domain: [html markup parse text web xml] License: 'cc-by-sa ] Usage: [ test: {<a><b><c id="d">Text</c> <c id="e" /></b></a>} load-xml test doc: load-xml/dom test doc/get-by-tag <c> c: doc/get-by-id "d" c/text doc/tree/<a>/<b> ] ] load-xml: use [ xml! doc make-node space word decode entity text name attribute element header content ][ xml!: context [ name: value: tree: branch: position: none flatten: does [""] get-by-tag: func [tag /local result rule mk][ result: copy [] parse tree rule: [ some [ opt [mk: tag skip (append result make-node mk) :mk] skip [into rule | skip] ] ] result ] get-by-id: func [id /local result rule mk][ parse tree rule: [ some [ mk: tag! into [thru /id id to end] (result: make-node mk) end skip | skip [into rule | skip] ] ] result ] text: has [result][ case/all [ string? value [result: value] block? value [ result: all [ parse value [any [refinement! skip] # set result string!] result ] ] string? result [trim/auto copy result] ] ] get: func [name [refinement! tag!] /local result mk][ if parse tree [ tag! into [ any [ mk: name [block! (result: make-node mk) | set result skip] to end | [refinement! | tag! | issue!] skip ] ] ][result] ] sibling: func [/before /after][ case [ all [after find [tag! issue!] type?/word position/3] [ make-node skip position 2 ] all [before find [tag! issue!] type?/word position/-2] [ make-node skip position -2 ] ] ] parent: "Need position stack" children: has [result mk][ result: copy [] parse case [ block? value [value] string? value [reduce [# value]] none? value [[]] ][ any [refinement! skip] any [mk: [tag! | issue!] skip (append result make-node mk)] ] result ] clone: does [make-node tree] append-child: func [name data /local at][ case [ none? position/2 [value: tree/2: position/2: copy []] string? position/2 [ new-line value: tree/2: position/2: compose [# (position/2)] true ] ] either refinement? name [ parse position/2 [any [refinement! skip] at:] ][at: tail position/2] insert at reduce [name data] new-line at true ] append-text: func [text][ case [ none? position/2 [value: tree/2: position/2: text] string? position/2 [append position/2 text] # = pick tail position/2 -2 [append last position/2 text] block? position/2 [append-child # text] ] ] append-attr: func [name value][ append-child to-refinement name value ] ] doc: make xml! [ branch: make block! 10 document: true new: does [clear branch tree: position: reduce ['document none]] open-tag: func [tag][ insert/only branch position tree: position: append-child to-tag tag none ] close-tag: func [tag][ tag: to-tag tag while [tag <> position/1][ probe reform ["No End Tag:" position/1] if empty? branch [make error! "End tag error!"] take branch ] tree: position: take branch ] ] make-node: func [here /base][ make either base [doc][xml!][ position: here name: here/1 value: here/2 tree: reduce [name value] ] ] space: use [space][ space: charset "^-^/^M " [some space] ] word: use [w1 w+][ w1: #[bitset! 64#{AAAAAAAAAAD+//+H/v//B/////////////////////8=}] w+: #[bitset! 64#{AAAAAABg/wP+//+H/v//B/////////////////////8=}] [w1 any w+] ] decode: use [nm hx rf mk ex ns entity to-utf-char][ nm: #[bitset! 64#{AAAAAAAA/wMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=}] hx: #[bitset! 64#{AAAAAAAA/wN+AAAAfgAAAAAAAAAAAAAAAAAAAAAAAAA=}] ns: ["lt" 60 "gt" 62 "amp" 38 "quot" 34 "apos" 39] to-utf-char: use [os fc en][ os: [0 192 224 240 248 252] fc: [1 64 4096 262144 16777216 1073741824] en: [127 2047 65535 2097151 67108863 2147483647] func [int [integer!] /local char][ repeat ln 6 [ if int <= en/:ln [ char: reduce [os/:ln + to integer! (int / fc/:ln)] repeat ps ln - 1 [ insert next char (to integer! int / fc/:ps) // 64 + 128 ] break ] ] to-string to-binary char ] ] entity: [ mk: #"&" [ copy rf word ";" (rf: any [select ns rf 63]) | #"#" [ #"x" copy rf 2 4 hx ";" (rf: to-integer to-issue rf) | copy rf 2 5 nm ";" (rf: to-integer rf) ] ] ex: (mk: change/part mk to-utf-char rf ex) :mk ] func [text [string!]][ if parse/all text [any [to "&" [entity | skip]] to end][text] ] ] entity: use [nm hx][ nm: charset "0123456789" hx: charset "0123456789abcdefABCDEF" [#"&" [word | #"#" [1 5 nm | #"x" 1 4 hx]] ";" | #"&"] ] text: use [char value][ char: complement charset "^-^/^M &<" [ copy value [ opt space [char | entity] any [char | entity | space] ] (doc/append-text decode value) ] ] name: [word opt [":" word]] attribute: use [q1 q2 attr value][ q1: complement charset {"&<} q2: complement charset {&'<} [ space copy attr name opt space "=" opt space [ ; lone ampersand is 'loose' not 'strict' {"} copy value any [q1 | entity | "&"] {"} | {'} copy value any [q2 | entity | "&"] {'} ] (doc/append-attr attr decode any [value ""]) ] ] element: use [tag value][ [ #"<" [ copy tag name (doc/open-tag tag) any attribute opt space [ "/>" (doc/close-tag tag) | #">" content "</" copy tag name (doc/close-tag tag) opt space #">" ] | #"!" [ "--" copy value to "-->" 3 skip ; (doc/append-child #comment value) | "[CDATA[" copy value to "]]>" 3 skip (doc/append-text value) ] ] ] ] header: [ any [ space | "<" ["?xml" thru "?>" | "!" ["--" thru "-->" | thru ">"] | "?" thru "?>"] ] ] content: [any [text | element | space]] load-xml: func [document /dom /local root][ if any [file? document url? document][document: read document] root: doc/new parse/all/case document [header element to end] doc/tree: any [root/document []] doc/value: doc/tree/2 either dom [make-node/base doc/tree][doc/tree] ] ]
halt ;; to terminate script if DO'ne from webpage
Notes