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template.lua
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()
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