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local setmetatable = setmetatable
local loadstring = loadstring
local tostring = tostring
local setfenv = setfenv
local require = require
local concat = table.concat
local assert = assert
local write = io.write
local pcall = pcall
local phase
local open = io.open
local load = load
local type = type
local dump = string.dump
local find = string.find
local gsub = string.gsub
local byte = string.byte
local null
local sub = string.sub
local ngx = ngx
local jit = jit
local var
local _VERSION = _VERSION
local _ENV = _ENV -- luacheck: globals _ENV
local _G = _G
local HTML_ENTITIES = {
["&"] = "&",
["<"] = "<",
[">"] = ">",
['"'] = """,
["'"] = "'",
["/"] = "/"
}
local CODE_ENTITIES = {
["{"] = "{",
["}"] = "}",
["&"] = "&",
["<"] = "<",
[">"] = ">",
['"'] = """,
["'"] = "'",
["/"] = "/"
}
local VAR_PHASES
local ESC = byte("\27")
local NUL = byte("\0")
local HT = byte("\t")
local VT = byte("\v")
local LF = byte("\n")
local SOL = byte("/")
local BSOL = byte("\\")
local SP = byte(" ")
local AST = byte("*")
local NUM = byte("#")
local LPAR = byte("(")
local LSQB = byte("[")
local LCUB = byte("{")
local MINUS = byte("-")
local PERCNT = byte("%")
local EMPTY = ""
local VIEW_ENV
if _VERSION == "Lua 5.1" then
VIEW_ENV = { __index = function(t, k)
return t.context[k] or t.template[k] or _G[k]
end }
else
VIEW_ENV = { __index = function(t, k)
return t.context[k] or t.template[k] or _ENV[k]
end }
end
local newtab
do
local ok
ok, newtab = pcall(require, "table.new")
if not ok then newtab = function() return {} end end
end
local function enabled(val)
if val == nil then return true end
return val == true or (val == "1" or val == "true" or val == "on")
end
local function trim(s)
return gsub(gsub(s, "^%s+", EMPTY), "%s+$", EMPTY)
end
local function rpos(view, s)
while s > 0 do
local c = byte(view, s, s)
if c == SP or c == HT or c == VT or c == NUL then
s = s - 1
else
break
end
end
return s
end
local function escaped(view, s)
if s > 1 and byte(view, s - 1, s - 1) == BSOL then
if s > 2 and byte(view, s - 2, s - 2) == BSOL then
return false, 1
else
return true, 1
end
end
return false, 0
end
local function read_file(path)
local file, err = open(path, "rb")
if not file then return nil, err end
local content
content, err = file:read "*a"
file:close()
return content, err
end
local print_view
local load_view
if ngx then
print_view = ngx.print or write
var = ngx.var
null = ngx.null
phase = ngx.get_phase
VAR_PHASES = {
set = true,
rewrite = true,
access = true,
content = true,
header_filter = true,
body_filter = true,
log = true,
preread = true
}
local capture = ngx.location.capture
local prefix = ngx.config.prefix()
load_view = function(template)
return function(view, plain)
if plain == true then return view end
local vars = VAR_PHASES[phase()]
local path = view
local root = template.location
if (not root or root == EMPTY) and vars then
root = var.template_location
end
if root and root ~= EMPTY then
if byte(root, -1) == SOL then root = sub(root, 1, -2) end
if byte(path, 1) == SOL then path = sub(path, 2) end
path = root .. "/" .. path
local res = capture(path)
if res.status == 200 then return res.body end
end
path = view
root = template.root
if (not root or root == EMPTY) and vars then
root = var.template_root
if not root or root == EMPTY then root = var.document_root or prefix end
end
if root and root ~= EMPTY then
if byte(root, -1) == SOL then root = sub(root, 1, -2) end
if byte(path, 1) == SOL then path = sub(path, 2) end
path = root .. "/" .. path
end
return plain == false and assert(read_file(path)) or read_file(path) or view
end
end
else
print_view = write
load_view = function(template)
return function(view, plain)
if plain == true then return view end
local path, root = view, template.root
if root and root ~= EMPTY then
if byte(root, -1) == SOL then root = sub(root, 1, -2) end
if byte(view, 1) == SOL then path = sub(view, 2) end
path = root .. "/" .. path
end
return plain == false and assert(read_file(path)) or read_file(path) or view
end
end
end
local function load_file(func)
return function(view) return func(view, false) end
end
local function load_string(func)
return function(view) return func(view, true) end
end
local loader
if jit or _VERSION ~= "Lua 5.1" then
loader = function(template)
return function(view)
return assert(load(view, nil, nil, setmetatable({ template = template }, VIEW_ENV)))
end
end
else
loader = function(template)
return function(view)
local func = assert(loadstring(view))
setfenv(func, setmetatable({ template = template }, VIEW_ENV))
return func
end
end
end
local function visit(visitors, content, tag, name)
if not visitors then
return content
end
for i = 1, visitors.n do
content = visitors[i](content, tag, name)
end
return content
end
local function new(template, safe)
template = template or newtab(0, 26)
template._VERSION = "2.0"
template.cache = {}
template.load = load_view(template)
template.load_file = load_file(template.load)
template.load_string = load_string(template.load)
template.print = print_view
local load_chunk = loader(template)
local caching
if VAR_PHASES and VAR_PHASES[phase()] then
caching = enabled(var.template_cache)
else
caching = true
end
local visitors
function template.visit(func)
if not visitors then
visitors = { func, n = 1 }
return
end
visitors.n = visitors.n + 1
visitors[visitors.n] = func
end
function template.caching(enable)
if enable ~= nil then caching = enable == true end
return caching
end
function template.output(s)
if s == nil or s == null then return EMPTY end
if type(s) == "function" then return template.output(s()) end
return tostring(s)
end
function template.escape(s, c)
if type(s) == "string" then
if c then return gsub(s, "[}{\">/<'&]", CODE_ENTITIES) end
return gsub(s, "[\">/<'&]", HTML_ENTITIES)
end
return template.output(s)
end
function template.new(view, layout)
local vt = type(view)
if vt == "boolean" then return new(nil, view) end
if vt == "table" then return new(view, safe) end
if vt == "nil" then return new(nil, safe) end
local render
local process
if layout then
if type(layout) == "table" then
render = function(self, context)
context = context or self
context.blocks = context.blocks or {}
context.view = template.process(view, context)
layout.blocks = context.blocks or {}
layout.view = context.view or EMPTY
layout:render()
end
process = function(self, context)
context = context or self
context.blocks = context.blocks or {}
context.view = template.process(view, context)
layout.blocks = context.blocks or {}
layout.view = context.view
return tostring(layout)
end
else
render = function(self, context)
context = context or self
context.blocks = context.blocks or {}
context.view = template.process(view, context)
template.render(layout, context)
end
process = function(self, context)
context = context or self
context.blocks = context.blocks or {}
context.view = template.process(view, context)
return template.process(layout, context)
end
end
else
render = function(self, context)
return template.render(view, context or self)
end
process = function(self, context)
return template.process(view, context or self)
end
end
if safe then
return setmetatable({
render = function(...)
local ok, err = pcall(render, ...)
if not ok then
return nil, err
end
end,
process = function(...)
local ok, output = pcall(process, ...)
if not ok then
return nil, output
end
return output
end,
}, {
__tostring = function(...)
local ok, output = pcall(process, ...)
if not ok then
return ""
end
return output
end })
end
return setmetatable({
render = render,
process = process
}, {
__tostring = process
})
end
function template.precompile(view, path, strip, plain)
local chunk = dump(template.compile(view, nil, plain), strip ~= false)
if path then
local file = open(path, "wb")
file:write(chunk)
file:close()
end
return chunk
end
function template.precompile_string(view, path, strip)
return template.precompile(view, path, strip, true)
end
function template.precompile_file(view, path, strip)
return template.precompile(view, path, strip, false)
end
function template.compile(view, cache_key, plain)
assert(view, "view was not provided for template.compile(view, cache_key, plain)")
if cache_key == "no-cache" then
return load_chunk(template.parse(view, plain)), false
end
cache_key = cache_key or view
local cache = template.cache
if cache[cache_key] then return cache[cache_key], true end
local func = load_chunk(template.parse(view, plain))
if caching then cache[cache_key] = func end
return func, false
end
function template.compile_file(view, cache_key)
return template.compile(view, cache_key, false)
end
function template.compile_string(view, cache_key)
return template.compile(view, cache_key, true)
end
function template.parse(view, plain)
assert(view, "view was not provided for template.parse(view, plain)")
if plain ~= true then
view = template.load(view, plain)
if byte(view, 1, 1) == ESC then return view end
end
local j = 2
local c = {[[
context=... or {}
local ___,blocks,layout={},blocks or {}
local function include(v, c) return template.process(v, c or context) end
local function echo(...) for i=1,select("#", ...) do ___[#___+1] = tostring(select(i, ...)) end end
]] }
local i, s = 1, find(view, "{", 1, true)
while s do
local t, p = byte(view, s + 1, s + 1), s + 2
if t == LCUB then
local e = find(view, "}}", p, true)
if e then
local z, w = escaped(view, s)
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
if z then
i = s
else
c[j] = "___[#___+1]=template.escape("
c[j+1] = visit(visitors, trim(sub(view, p, e - 1)), "{")
c[j+2] = ")\n"
j=j+3
s, i = e + 1, e + 2
end
end
elseif t == AST then
local e = find(view, "*}", p, true)
if e then
local z, w = escaped(view, s)
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
if z then
i = s
else
c[j] = "___[#___+1]=template.output("
c[j+1] = visit(visitors, trim(sub(view, p, e - 1)), "*")
c[j+2] = ")\n"
j=j+3
s, i = e + 1, e + 2
end
end
elseif t == PERCNT then
local e = find(view, "%}", p, true)
if e then
local z, w = escaped(view, s)
if z then
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
i = s
else
local n = e + 2
if byte(view, n, n) == LF then
n = n + 1
end
local r = rpos(view, s - 1)
if i <= r then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, r))
c[j+2] = "]=]\n"
j=j+3
end
c[j] = visit(visitors, trim(sub(view, p, e - 1)), "%")
c[j+1] = "\n"
j=j+2
s, i = n - 1, n
end
end
elseif t == LPAR then
local e = find(view, ")}", p, true)
if e then
local z, w = escaped(view, s)
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
if z then
i = s
else
local f = visit(visitors, sub(view, p, e - 1), "(")
local x = find(f, ",", 2, true)
if x then
c[j] = "___[#___+1]=include([=["
c[j+1] = trim(sub(f, 1, x - 1))
c[j+2] = "]=],"
c[j+3] = trim(sub(f, x + 1))
c[j+4] = ")\n"
j=j+5
else
c[j] = "___[#___+1]=include([=["
c[j+1] = trim(f)
c[j+2] = "]=])\n"
j=j+3
end
s, i = e + 1, e + 2
end
end
elseif t == LSQB then
local e = find(view, "]}", p, true)
if e then
local z, w = escaped(view, s)
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
if z then
i = s
else
c[j] = "___[#___+1]=include("
c[j+1] = visit(visitors, trim(sub(view, p, e - 1)), "[")
c[j+2] = ")\n"
j=j+3
s, i = e + 1, e + 2
end
end
elseif t == MINUS then
local e = find(view, "-}", p, true)
if e then
local x, y = find(view, sub(view, s, e + 1), e + 2, true)
if x then
local z, w = escaped(view, s)
if z then
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
i = s
else
y = y + 1
x = x - 1
if byte(view, y, y) == LF then
y = y + 1
end
local b = trim(sub(view, p, e - 1))
if b == "verbatim" or b == "raw" then
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
c[j] = "___[#___+1]=[=["
c[j+1] = visit(visitors, sub(view, e + 2, x))
c[j+2] = "]=]\n"
j=j+3
else
if byte(view, x, x) == LF then
x = x - 1
end
local r = rpos(view, s - 1)
if i <= r then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, r))
c[j+2] = "]=]\n"
j=j+3
end
c[j] = 'blocks["'
c[j+1] = b
c[j+2] = '"]=include[=['
c[j+3] = visit(visitors, sub(view, e + 2, x), "-", b)
c[j+4] = "]=]\n"
j=j+5
end
s, i = y - 1, y
end
end
end
elseif t == NUM then
local e = find(view, "#}", p, true)
if e then
local z, w = escaped(view, s)
if i < s - w then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
c[j+2] = "]=]\n"
j=j+3
end
if z then
i = s
else
e = e + 2
if byte(view, e, e) == LF then
e = e + 1
end
s, i = e - 1, e
end
end
end
s = find(view, "{", s + 1, true)
end
s = sub(view, i)
if s and s ~= EMPTY then
c[j] = "___[#___+1]=[=[\n"
c[j+1] = visit(visitors, s)
c[j+2] = "]=]\n"
j=j+3
end
c[j] = "return layout and include(layout,setmetatable({view=table.concat(___),blocks=blocks},{__index=context})) or table.concat(___)" -- luacheck: ignore
return concat(c)
end
function template.parse_file(view)
return template.parse(view, false)
end
function template.parse_string(view)
return template.parse(view, true)
end
function template.process(view, context, cache_key, plain)
assert(view, "view was not provided for template.process(view, context, cache_key, plain)")
return template.compile(view, cache_key, plain)(context)
end
function template.process_file(view, context, cache_key)
assert(view, "view was not provided for template.process_file(view, context, cache_key)")
return template.compile(view, cache_key, false)(context)
end
function template.process_string(view, context, cache_key)
assert(view, "view was not provided for template.process_string(view, context, cache_key)")
return template.compile(view, cache_key, true)(context)
end
function template.render(view, context, cache_key, plain)
assert(view, "view was not provided for template.render(view, context, cache_key, plain)")
template.print(template.process(view, context, cache_key, plain))
end
function template.render_file(view, context, cache_key)
assert(view, "view was not provided for template.render_file(view, context, cache_key)")
template.render(view, context, cache_key, false)
end
function template.render_string(view, context, cache_key)
assert(view, "view was not provided for template.render_string(view, context, cache_key)")
template.render(view, context, cache_key, true)
end
if safe then
return setmetatable({}, {
__index = function(_, k)
if type(template[k]) == "function" then
return function(...)
local ok, a, b = pcall(template[k], ...)
if not ok then
return nil, a
end
return a, b
end
end
return template[k]
end,
__new_index = function(_, k, v)
template[k] = v
end,
})
end
return template
end
return new()