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if not modules then modules = { } end modules ['util-tpl'] = {
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"
}
-- This is experimental code. Coming from dos and windows, I've always used %whatever%
-- as template variables so let's stick to it. After all, it's easy to parse and stands
-- out well. A double %% is turned into a regular %.
utilities.templates = utilities.templates or { }
local templates = utilities.templates
local trace_template = false trackers.register("templates.trace",function(v) trace_template = v end)
local report_template = logs.reporter("template")
local format = string.format
local P, C, Cs, Carg, lpegmatch = lpeg.P, lpeg.C, lpeg.Cs, lpeg.Carg, lpeg.match
-- todo: make installable template.new
local replacer
local function replacekey(k,t,recursive)
local v = t[k]
if not v then
if trace_template then
report_template("unknown key %q",k)
end
return ""
else
if trace_template then
report_template("setting key %q to value %q",k,v)
end
if recursive then
return lpegmatch(replacer,v,1,t)
else
return v
end
end
end
local sqlescape = lpeg.replacer {
{ "'", "''" },
{ "\\", "\\\\" },
{ "\r\n", "\\n" },
{ "\r", "\\n" },
-- { "\t", "\\t" },
}
local escapers = {
lua = function(s)
return format("%q",s)
end,
sql = function(s)
return lpegmatch(sqlescape,s)
end,
}
local function replacekeyunquoted(s,t,how,recurse) -- ".. \" "
local escaper = how and escapers[how] or escapers.lua
return escaper(replacekey(s,t,recurse))
end
local single = P("%") -- test %test% test : resolves test
local double = P("%%") -- test 10%% test : %% becomes %
local lquoted = P("%[") -- test %[test]" test : resolves test with escaped "'s
local rquoted = P("]%") --
local escape = double / '%%'
local nosingle = single / ''
local nodouble = double / ''
local nolquoted = lquoted / ''
local norquoted = rquoted / ''
local key = nosingle * (C((1-nosingle)^1 * Carg(1) * Carg(2) * Carg(3))/replacekey) * nosingle
local unquoted = nolquoted * ((C((1 - norquoted)^1) * Carg(1) * Carg(2) * Carg(3))/replacekeyunquoted) * norquoted
local any = P(1)
replacer = Cs((unquoted + escape + key + any)^0)
local function replace(str,mapping,how,recurse)
if mapping then
return lpegmatch(replacer,str,1,mapping,how or "lua",recurse or false) or str
else
return str
end
end
-- print(replace("test '%[x]%' test",{ x = [[a 'x' a]] }))
-- print(replace("test '%[x]%' test",{ x = [[a 'x' a]] },'sql'))
templates.replace = replace
function templates.load(filename,mapping,how,recurse)
local data = io.loaddata(filename) or ""
if mapping and next(mapping) then
return replace(data,mapping,how,recurse)
else
return data
end
end
function templates.resolve(t,mapping,how,recurse)
if not mapping then
mapping = t
end
for k, v in next, t do
t[k] = replace(v,mapping,how,recurse)
end
return t
end
-- inspect(utilities.templates.replace("test %one% test", { one = "%two%", two = "two" }))
-- inspect(utilities.templates.resolve({ one = "%two%", two = "two", three = "%three%" }))
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