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template.lua
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-- 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()
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