1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
if not modules then modules = { } end modules ['data-fil'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local ioopen = io.open
local isdir = lfs.isdir
local trace_locating = false trackers.register("resolvers.locating", function(v) trace_locating = v end)
local report_files = logs.reporter("resolvers","files")
local resolvers = resolvers
local resolveprefix = resolvers.resolve
local findfile = resolvers.findfile
local scanfiles = resolvers.scanfiles
local registerfilehash = resolvers.registerfilehash
local appendhash = resolvers.appendhash
local loadcachecontent = caches.loadcontent
local checkgarbage = utilities.garbagecollector and utilities.garbagecollector.check
function resolvers.locators.file(specification)
local filename = specification.filename
local realname = resolveprefix(filename) -- no shortcut
if realname and realname ~= '' and isdir(realname) then
if trace_locating then
report_files("file locator %a found as %a",filename,realname)
end
appendhash('file',filename,true) -- cache
elseif trace_locating then
report_files("file locator %a not found",filename)
end
end
function resolvers.hashers.file(specification)
local pathname = specification.filename
local content = loadcachecontent(pathname,'files')
registerfilehash(pathname,content,content==nil)
end
function resolvers.generators.file(specification)
local pathname = specification.filename
local content = scanfiles(pathname,false,true) -- scan once
registerfilehash(pathname,content,true)
end
resolvers.concatinators.file = file.join
local finders = resolvers.finders
local notfound = finders.notfound
function finders.file(specification,filetype)
local filename = specification.filename
local foundname = findfile(filename,filetype)
if foundname and foundname ~= "" then
if trace_locating then
report_files("file finder: %a found",filename)
end
return foundname
else
if trace_locating then
report_files("file finder: %a not found",filename)
end
return notfound()
end
end
-- The default textopener will be overloaded later on.
local openers = resolvers.openers
local notfound = openers.notfound
local overloaded = false
local function textopener(tag,filename,f)
return {
reader = function() return f:read () end,
close = function() return f:close() end,
}
end
function openers.helpers.textopener(...)
return textopener(...)
end
function openers.helpers.settextopener(opener)
if overloaded then
report_files("file opener: %s overloaded","already")
else
if trace_locating then
report_files("file opener: %s overloaded","once")
end
overloaded = true
textopener = opener
end
end
function openers.file(specification,filetype)
local filename = specification.filename
if filename and filename ~= "" then
local f = ioopen(filename,"r")
if f then
if trace_locating then
report_files("file opener: %a opened",filename)
end
return textopener("file",filename,f)
end
end
if trace_locating then
report_files("file opener: %a not found",filename)
end
return notfound()
end
local loaders = resolvers.loaders
local notfound = loaders.notfound
function loaders.file(specification,filetype)
local filename = specification.filename
if filename and filename ~= "" then
local f = ioopen(filename,"rb")
if f then
if trace_locating then
report_files("file loader: %a loaded",filename)
end
local s = f:read("*a") -- io.readall(f) is faster but we never have large files here
if checkgarbage then
checkgarbage(#s)
end
f:close()
if s then
return true, s, #s
end
end
end
if trace_locating then
report_files("file loader: %a not found",filename)
end
return notfound()
end
|
