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htmlize.rkt
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htmlize.rkt
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;; ydiff - a language-aware tool for comparing programs
;; Copyright (C) 2011-2013 Yin Wang ([email protected])
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
#lang racket
(require "utils.rkt")
(require "structs.rkt")
(provide (all-defined-out))
;-------------------------------------------------------------
; HTML generation
;-------------------------------------------------------------
;----------------- utils ----------------
(define qs
(lambda (x)
(let ([x (cond
[(symbol? x) (symbol->string x)]
[(number? x) (number->string x)]
[(string? x) x])])
(string-append "'" x "'"))))
(define line
(lambda (port . s)
(display (string-append (apply string-append s) "\n") port)))
(define change-tags
(lambda (changes side)
(let loop ([cs changes] [tags '()])
(cond
[(null? cs) tags]
[else
(let ([key (if (eq? side 'left)
(Change-old (car cs))
(Change-new (car cs)))])
(cond
[(or (not key)
(= (Node-start key) (Node-end key)))
(loop (cdr cs) tags)]
[(and (Change-old (car cs)) (Change-new (car cs)))
(let ([startTag (Tag (link-start (car cs) side)
(Node-start key) -1)]
[endTag (Tag "</a>" (Node-end key) (Node-start key))])
(loop (cdr cs) (cons endTag (cons startTag tags))))]
[else
(let ([startTag (Tag (span-start (car cs) side)
(Node-start key) -1)]
[endTag (Tag "</span>" (Node-end key) (Node-start key))])
(loop (cdr cs) (cons endTag (cons startTag tags))))]))]))))
(define apply-tags
(lambda (s tags)
(let ([tags (sort tags tag-sort-fn)])
(let loop ([tags tags] [curr 0] [out '()])
(cond
[(null? tags)
(cond
[(< curr (string-length s))
(loop tags (add1 curr) (cons (escape (string-ref s curr)) out))]
[else
(apply string-append (reverse out))])]
[else
(cond
[(< curr (Tag-idx (car tags)))
(loop tags (add1 curr) (cons (escape (string-ref s curr)) out))]
[else
(loop (cdr tags) curr (cons (Tag-tag (car tags)) out))])])))))
;; get the CSS class for the change
(define change-class
(lambda (change)
(cond
[(mov? change) "m"] ; move
[(del? change) "d"]
[(ins? change) "i"]
[else "u"]))) ; unchanged
(define link-start
(lambda (change side)
(let ([cls (change-class change)]
[me (if (eq? side 'left)
(Change-old change)
(Change-new change))]
[other (if (eq? side 'left)
(Change-new change)
(Change-old change))])
(string-append
"<a id=" (qs (uid me))
" tid=" (qs (uid other))
" class=" (qs cls)
">"))))
(define span-start
(lambda (change side)
(string-append "<span class=" (qs (change-class change)) ">")))
(define tag-sort-fn
(lambda (t1 t2)
(cond
[(= (Tag-idx t1) (Tag-idx t2))
(> (Tag-start t1) (Tag-start t2))]
[else
(< (Tag-idx t1) (Tag-idx t2))])))
(define *escape-table*
'((#\" . """)
(#\' . "'")
(#\< . "<")
(#\> . ">")))
(define escape
(lambda (c)
(cond
[(assq c *escape-table*) => cdr]
[else (char->string c)])))
; getting the base name of a path/file name
; (base-name "mk/mk-c.scm") => mk-c
(define base-name
(lambda (fn)
(let loop ([i (- (string-length fn) 1)]
[start -1]
[end (- (string-length fn) 1)])
(cond
[(= i 0)
(substring fn i end)]
[(eq? (string-ref fn i) #\.)
(loop (sub1 i) start i)]
[(eq? (string-ref fn i) #\/)
(substring fn (add1 i) end)]
[else
(loop (sub1 i) start end)]))))
(define html-header
(lambda (port)
(line port "<html>")
(line port "<head>")
(line port "<META http-equiv=\"Content-Type\""
" content=\"text/html; charset=utf-8\">")
(line port "<LINK href=\"diff.css\""
" rel=\"stylesheet\" type=\"text/css\">")
(line port "<script type=\"text/javascript\""
" src=\"nav.js\"></script>")
(line port "</head>")
(line port "<body>")))
(define html-footer
(lambda (port)
(line port "</body>")
(line port "</html>")))
(define write-html
(lambda (port text side)
(line port (string-append "<div id=\"" side "\" class=\"src\">"))
(line port "<pre>")
(if (string=? side "left")
(line port "<a id='leftstart' tid='rightstart'></a>")
(line port "<a id='rightstart' tid='leftstart'></a>"))
(line port text)
(line port "</pre>")
(line port "</div>")))
(define htmlize
(lambda (changes file1 file2 text1 text2)
(letv ([tags1 (change-tags changes 'left)]
[tags2 (change-tags changes 'right)]
[tagged-text1 (apply-tags text1 tags1)]
[tagged-text2 (apply-tags text2 tags2)]
[out-file (string-append (base-name file1) "-"
(base-name file2) ".html")]
[port (open-output-file out-file
#:mode 'text
#:exists 'replace)])
(html-header port)
(write-html port tagged-text1 "left")
(write-html port tagged-text2 "right")
(html-footer port)
(close-output-port port))))