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authorPhilipp Gesang <phg42.2a@gmail.com>2013-04-12 13:59:39 +0200
committerPhilipp Gesang <phg42.2a@gmail.com>2013-04-12 13:59:39 +0200
commit0e9c876d4af89655cc0dfa5e2fd2758be39dacc3 (patch)
tree4e0b8dece0771408ca3b1b6ace9ecf123db597b4 /lualibs-util-tpl.lua
parent790222c6c4698786b322138770a3afbc8647d01e (diff)
downloadlualibs-0e9c876d4af89655cc0dfa5e2fd2758be39dacc3.tar.gz
import libary files from Context
Diffstat (limited to 'lualibs-util-tpl.lua')
-rw-r--r--lualibs-util-tpl.lua174
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diff --git a/lualibs-util-tpl.lua b/lualibs-util-tpl.lua
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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 tostring = tostring
+local format, sub = string.format, string.sub
+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,how,recursive)
+ local v = t[k]
+ if not v then
+ if trace_template then
+ report_template("unknown key %a",k)
+ end
+ return ""
+ else
+ v = tostring(v)
+ if trace_template then
+ report_template("setting key %a to value %a",k,v)
+ end
+ if recursive then
+ return lpegmatch(replacer,v,1,t,how,recursive)
+ else
+ return v
+ end
+ end
+end
+
+local sqlescape = lpeg.replacer {
+ { "'", "''" },
+ { "\\", "\\\\" },
+ { "\r\n", "\\n" },
+ { "\r", "\\n" },
+ -- { "\t", "\\t" },
+}
+
+local sqlquotedescape = lpeg.Cs(lpeg.Cc("'") * sqlescape * lpeg.Cc("'"))
+
+-- escapeset : \0\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\"\\\127
+-- test string: [[1\0\31test23"\\]] .. string.char(19) .. "23"
+--
+-- slow:
+--
+-- local luaescape = lpeg.replacer {
+-- { '"', [[\"]] },
+-- { '\\', [[\\]] },
+-- { R("\0\9") * #R("09"), function(s) return "\\00" .. byte(s) end },
+-- { R("\10\31") * #R("09"), function(s) return "\\0" .. byte(s) end },
+-- { R("\0\31") , function(s) return "\\" .. byte(s) end },
+-- }
+--
+-- slightly faster:
+--
+-- local luaescape = Cs ((
+-- P('"' ) / [[\"]] +
+-- P('\\') / [[\\]] +
+-- Cc("\\00") * (R("\0\9") / byte) * #R("09") +
+-- Cc("\\0") * (R("\10\31") / byte) * #R("09") +
+-- Cc("\\") * (R("\0\31") / byte) +
+-- P(1)
+-- )^0)
+
+local escapers = {
+ lua = function(s)
+ return sub(format("%q",s),2,-2)
+ end,
+ sql = function(s)
+ return lpegmatch(sqlescape,s)
+ end,
+}
+
+local quotedescapers = {
+ lua = function(s)
+ return format("%q",s)
+ end,
+ sql = function(s)
+ return lpegmatch(sqlquotedescape,s)
+ end,
+}
+
+lpeg.patterns.sqlescape = sqlescape
+lpeg.patterns.sqlescape = sqlquotedescape
+
+local luaescaper = escapers.lua
+local quotedluaescaper = quotedescapers.lua
+
+local function replacekeyunquoted(s,t,how,recurse) -- ".. \" "
+ local escaper = how and escapers[how] or luaescaper
+ return escaper(replacekey(s,t,how,recurse))
+end
+
+local function replacekeyquoted(s,t,how,recurse) -- ".. \" "
+ local escaper = how and quotedescapers[how] or quotedluaescaper
+ return escaper(replacekey(s,t,how,recurse))
+end
+
+local single = P("%") -- test %test% test : resolves test
+local double = P("%%") -- test 10%% test : %% becomes %
+local lquoted = P("%[") -- test '%[test]%' test : resolves to test with escaped "'s
+local rquoted = P("]%") --
+local lquotedq = P("%(") -- test %(test)% test : resolves to 'test' with escaped "'s
+local rquotedq = P(")%") --
+
+local escape = double / '%%'
+local nosingle = single / ''
+local nodouble = double / ''
+local nolquoted = lquoted / ''
+local norquoted = rquoted / ''
+local nolquotedq = lquotedq / ''
+local norquotedq = rquotedq / ''
+
+local key = nosingle * ((C((1-nosingle )^1) * Carg(1) * Carg(2) * Carg(3)) / replacekey ) * nosingle
+local quoted = nolquotedq * ((C((1-norquotedq)^1) * Carg(1) * Carg(2) * Carg(3)) / replacekeyquoted ) * norquotedq
+local unquoted = nolquoted * ((C((1-norquoted )^1) * Carg(1) * Carg(2) * Carg(3)) / replacekeyunquoted) * norquoted
+local any = P(1)
+
+ replacer = Cs((unquoted + quoted + escape + key + any)^0)
+
+local function replace(str,mapping,how,recurse)
+ if mapping and str 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 = true }))
+-- print(replace("test '%[x]%' test",{ x = [[a 'x'  a]], y = "oeps" },'sql'))
+-- print(replace("test '%[x]%' test",{ x = [[a '%y%'  a]], y = "oeps" },'sql',true))
+-- print(replace([[test %[x]% test]],{ x = [[a "x"  a]]}))
+-- print(replace([[test %(x)% test]],{ x = [[a "x"  a]]}))
+
+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%" }))