SourceBrowser

back-res.lua /size: 6676 b last modification: 2020-07-01 14:35
1if
 not
 modules
 then
 modules
 =
 {
 }
 end
 modules
 [
'
back-res
'
]
 =
 {
2    version
   =
 1
.
001
,
3    comment
   =
 "
companion to back-ini.mkiv
"
,
4    author
    =
 "
Hans Hagen, PRAGMA-ADE, Hasselt NL
"
,
5    copyright
 =
 "
PRAGMA ADE / ConTeXt Development Team
"
,
6    license
   =
 "
see context related readme files
"
7}
8
9local
 context
       =
 context
10
11local
 trace
         =
 false
  trackers
.
register
(
"
backend
"
,
 function
(
v
)
 trace
 =
 v
 end
)
12local
 report
        =
 logs
.
reporter
(
"
backend
"
)
13
14local
 scanners
      =
 tokens
.
scanners
15local
 scankeyword
   =
 scanners
.
keyword
16local
 scaninteger
   =
 scanners
.
integer
17local
 scanstring
    =
 scanners
.
string
18local
 scandimension
 =
 scanners
.
dimension
19local
 scanword
      =
 scanners
.
word
20local
 scanwhd
       =
 scanners
.
whd
21
22local
 implement
     =
 interfaces
.
implement
23local
 constants
     =
 interfaces
.
constants
24local
 variables
     =
 interfaces
.
variables
25
26-- A box resource has an index. This happens to be an object number due to the pdf
27-- backend but in fact it's an abstraction. This is why we have explicit fetchers.
28-- The internal number (as in \Fm123) is yet another number.
29
30local
 tex_saveboxresource
          =
 tex
.
saveboxresource
31local
 tex_useboxresource
           =
 tex
.
useboxresource
32local
 tex_getboxresourcebox
        =
 tex
.
getboxresourcebox
33local
 tex_getboxresourcedimensions
 =
 tex
.
getboxresourcedimensions
34
35updaters
.
register
(
"
backend.update
"
,
function
(
)
36    tex_saveboxresource
          =
 tex
.
saveboxresource
37    tex_useboxresource
           =
 tex
.
useboxresource
38    tex_getboxresourcebox
        =
 tex
.
getboxresourcebox
39    tex_getboxresourcedimensions
 =
 tex
.
getboxresourcedimensions
40end
)
41
42local
 savebox
 =
 function
(
...
)
 return
 tex_saveboxresource
(
...
)
 end
43local
 usebox
  =
 function
(
...
)
 return
 tex_useboxresource
(
...
)
 end
44local
 getbox
  =
 function
(
...
)
 return
 tex_getboxresourcebox
(
...
)
 end
45local
 getwhd
  =
 function
(
...
)
 return
 tex_getboxresourcedimensions
(
...
)
 end
46
47local
 boxresources
 =
 {
48    save
          =
 savebox
,
49    use
           =
 usebox
,
50    getbox
        =
 getbox
,
51    getdimensions
 =
 getwhd
,
52}
53
54tex
.
boxresources
 =
 boxresources
55
56-- local tex_saveimageresource = tex.saveimageresource
57-- local tex_useimageresource  = tex.useimageresource
58--
59-- updaters.register("backend.update",function()
60--     tex_saveimageresource = tex.saveimageresource
61--     tex_useimageresource  = tex.useimageresource
62-- end)
63--
64-- tex.imageresources = {
65--     save = function(...) return tex_saveimageresource(...) end,
66--     use  = function(...) return tex_useimageresource(...) end,
67-- }
68
69local
 lastindex
 =
 0
70
71local
 function
 saveboxresource
(
)
72    local
 immediate
  =
 true
73    local
 kind
       =
 scankeyword
(
"
type
"
)
 and
 scaninteger
(
)
 or
 0
74    local
 attributes
 =
 scankeyword
(
"
attr
"
)
 and
 scanstring
(
)
 or
 nil
75    local
 resources
  =
 scankeyword
(
"
resources
"
)
 and
 scanstring
(
)
 or
 nil
76    local
 margin
     =
 scankeyword
(
"
margin
"
)
 and
 scandimension
(
)
 or
 0
 -- register
77    local
 boxnumber
  =
 scaninteger
(
)
78    --
79    lastindex
 =
 savebox
(
boxnumber
,
attributes
,
resources
,
immediate
,
kind
,
margin
)
80    if
 trace
 then
81        report
(
"
\\saveboxresource: index %i
"
,
lastindex
)
82    end
83end
84
85local
 function
 lastsavedboxresourceindex
(
)
86    if
 trace
 then
87        report
(
"
\\lastsaveboxresource: index %i
"
,
lastindex
)
88    end
89    context
(
"
%i
"
,
lastindex
)
90end
91
92local
 function
 useboxresource
(
)
93    local
 width
,
 height
,
 depth
 =
 scanwhd
(
)
94    local
 index
 =
 scaninteger
(
)
95    local
 node
  =
 usebox
(
index
,
width
,
height
,
depth
)
96    if
 trace
 then
97        report
(
"
\\useboxresource: index %i
"
,
index
)
98    end
99    context
(
node
)
100end
101
102implement
 {
 name
 =
 "
saveboxresource
"
,
           actions
 =
 saveboxresource
 }
103implement
 {
 name
 =
 "
lastsavedboxresourceindex
"
,
 actions
 =
 lastsavedboxresourceindex
 }
104implement
 {
 name
 =
 "
useboxresource
"
,
            actions
 =
 useboxresource
 }
105
106-- image resources
107
108local
 imageresources
 =
 {
 }
109local
 lastindex
      =
 0
110local
 lastpages
      =
 1
111
112local
 function
 saveimageresource
(
)
113    local
 width
,
 height
,
 depth
 =
 scanwhd
(
)
114    local
 page
       =
 1
115    local
 immediate
  =
 true
116    local
 margin
     =
 0
 -- or dimension
117    local
 attributes
 =
 scankeyword
(
"
attr
"
)
 and
 scanstring
(
)
 or
 nil
118    if
 scankeyword
(
"
named
"
)
 then
119        scanstring
(
)
 -- ignored
120    elseif
 scankeyword
(
"
page
"
)
 then
121        page
 =
 scaninteger
(
)
122    end
123    local
 userpassword
    =
 scankeyword
(
"
userpassword
"
)
 and
 scanstring
(
)
 or
 nil
124    local
 ownerpassword
   =
 scankeyword
(
"
ownerpassword
"
)
 and
 scanstring
(
)
 or
 nil
125    local
 visiblefilename
 =
 scankeyword
(
"
visiblefilename
"
)
 and
 scanstring
(
)
 or
 nil
126    local
 colorspace
      =
 scankeyword
(
"
colorspace
"
)
 and
 scaninteger
(
)
 or
 nil
127    local
 pagebox
         =
 scanword
(
)
 or
 nil
128    local
 filename
        =
 scanstring
(
)
129-- pcall
130    context
.
getfiguredimensions
(
 {
 filename
 }
,
 {
131        [
constants
.
userpassword
]
  =
 userpassword
,
132        [
constants
.
ownerpassword
]
 =
 ownerpassword
,
133        [
constants
.
page
]
          =
 page
 or
 1
,
134        [
constants
.
size
]
          =
 pagebox
,
135    }
)
136    context
.
relax
(
)
137    lastindex
 =
 lastindex
 +
 1
138    lastpages
 =
 1
139    imageresources
[
lastindex
]
 =
 {
140        filename
 =
 filename
,
141        page
     =
 page
 or
 1
,
142        size
     =
 pagebox
,
143        width
    =
 width
,
144        height
   =
 height
,
145        depth
    =
 depth
,
146        attr
     =
 attributes
,
147     -- margin   = margin,
148     }
149end
150
151local
 function
 lastsavedimageresourceindex
(
)
152    context
(
"
%i
"
,
lastindex
 or
 0
)
153end
154
155local
 function
 lastsavedimageresourcepages
(
)
156    context
(
"
%i
"
,
lastpages
 or
 0
)
 -- todo
157end
158
159local
 function
 useimageresource
(
)
160    local
 width
,
 height
,
 depth
 =
 scanwhd
(
)
161    if
 scankeyword
(
"
keepopen
"
)
 then
162        -- ignored
163    end
164    local
 index
 =
 scaninteger
(
)
165    local
 l
 =
 imageresources
[
index
]
166    if
 l
 then
167        if
 not
 (
width
 or
 height
 or
 depth
)
 then
168            width
  =
 l
.
width
169            height
 =
 l
.
height
170            depth
  =
 l
.
depth
171        end
172        -- pcall / we could use a dedicated call instead:
173        context
.
externalfigure
(
 {
 l
.
filename
 }
,
 {
174            [
constants
.
userpassword
]
  =
 l
.
userpassword
,
175            [
constants
.
ownerpassword
]
 =
 l
.
ownerpassword
,
176            [
constants
.
width
]
         =
 width
 and
 (
width
 .
.
 "
sp
"
)
 or
 nil
,
177            [
constants
.
height
]
        =
 height
 and
 (
height
 .
.
 "
sp
"
)
 or
 nil
,
178            [
constants
.
page
]
          =
 l
.
page
 or
 1
,
179            [
constants
.
size
]
          =
 pagebox
,
180        }
)
181        context
.
relax
(
)
182    else
183        report
(
"
no valid image resource %a
"
,
index
)
184    end
185end
186
187implement
 {
 name
 =
 "
saveimageresource
"
,
           actions
 =
 saveimageresource
 }
188implement
 {
 name
 =
 "
lastsavedimageresourceindex
"
,
 actions
 =
 lastsavedimageresourceindex
 }
189implement
 {
 name
 =
 "
lastsavedimageresourcepages
"
,
 actions
 =
 lastsavedimageresourcepages
 }
190implement
 {
 name
 =
 "
useimageresource
"
,
            actions
 =
 useimageresource
 }
191
Source Browser ?
