-- From lua-resty-template (modified to remove external dependencies)
--[[
Copyright (c) 2014 - 2020 Aapo Talvensaari
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
* Neither the name of the {organization} nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
]]--
-- $FreeBSD$
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 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 function load_view(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
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 function loader(template)
return function(view)
return assert(load(view, nil, nil, setmetatable({ template = template }, VIEW_ENV)))
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 = write
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()
