652 lines
22 KiB
Lua
652 lines
22 KiB
Lua
-- From lua-resty-template (modified to remove external dependencies)
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--[[
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Copyright (c) 2014 - 2020 Aapo Talvensaari
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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* Neither the name of the {organization} nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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]]--
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local setmetatable = setmetatable
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local loadstring = loadstring
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local tostring = tostring
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local setfenv = setfenv
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local require = require
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local concat = table.concat
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local assert = assert
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local write = io.write
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local pcall = pcall
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local phase
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local open = io.open
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local load = load
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local type = type
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local dump = string.dump
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local find = string.find
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local gsub = string.gsub
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local byte = string.byte
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local null
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local sub = string.sub
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local var
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local _VERSION = _VERSION
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local _ENV = _ENV -- luacheck: globals _ENV
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local _G = _G
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local HTML_ENTITIES = {
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["&"] = "&",
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["<"] = "<",
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[">"] = ">",
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['"'] = """,
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["'"] = "'",
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["/"] = "/"
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}
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local CODE_ENTITIES = {
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["{"] = "{",
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["}"] = "}",
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["&"] = "&",
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["<"] = "<",
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[">"] = ">",
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['"'] = """,
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["'"] = "'",
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["/"] = "/"
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}
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local VAR_PHASES
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local ESC = byte("\27")
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local NUL = byte("\0")
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local HT = byte("\t")
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local VT = byte("\v")
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local LF = byte("\n")
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local SOL = byte("/")
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local BSOL = byte("\\")
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local SP = byte(" ")
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local AST = byte("*")
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local NUM = byte("#")
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local LPAR = byte("(")
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local LSQB = byte("[")
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local LCUB = byte("{")
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local MINUS = byte("-")
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local PERCNT = byte("%")
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local EMPTY = ""
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local VIEW_ENV
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if _VERSION == "Lua 5.1" then
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VIEW_ENV = { __index = function(t, k)
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return t.context[k] or t.template[k] or _G[k]
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end }
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else
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VIEW_ENV = { __index = function(t, k)
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return t.context[k] or t.template[k] or _ENV[k]
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end }
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end
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local newtab
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do
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local ok
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ok, newtab = pcall(require, "table.new")
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if not ok then newtab = function() return {} end end
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end
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local function enabled(val)
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if val == nil then return true end
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return val == true or (val == "1" or val == "true" or val == "on")
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end
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local function trim(s)
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return gsub(gsub(s, "^%s+", EMPTY), "%s+$", EMPTY)
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end
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local function rpos(view, s)
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while s > 0 do
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local c = byte(view, s, s)
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if c == SP or c == HT or c == VT or c == NUL then
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s = s - 1
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else
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break
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end
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end
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return s
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end
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local function escaped(view, s)
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if s > 1 and byte(view, s - 1, s - 1) == BSOL then
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if s > 2 and byte(view, s - 2, s - 2) == BSOL then
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return false, 1
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else
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return true, 1
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end
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end
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return false, 0
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end
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local function read_file(path)
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local file, err = open(path, "rb")
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if not file then return nil, err end
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local content
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content, err = file:read "*a"
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file:close()
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return content, err
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end
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local function load_view(template)
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return function(view, plain)
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if plain == true then return view end
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local path, root = view, template.root
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if root and root ~= EMPTY then
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if byte(root, -1) == SOL then root = sub(root, 1, -2) end
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if byte(view, 1) == SOL then path = sub(view, 2) end
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path = root .. "/" .. path
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end
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return plain == false and assert(read_file(path)) or read_file(path) or view
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end
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end
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local function load_file(func)
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return function(view) return func(view, false) end
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end
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local function load_string(func)
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return function(view) return func(view, true) end
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end
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local function loader(template)
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return function(view)
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return assert(load(view, nil, nil, setmetatable({ template = template }, VIEW_ENV)))
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end
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end
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local function visit(visitors, content, tag, name)
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if not visitors then
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return content
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end
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for i = 1, visitors.n do
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content = visitors[i](content, tag, name)
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end
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return content
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end
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local function new(template, safe)
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template = template or newtab(0, 26)
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template._VERSION = "2.0"
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template.cache = {}
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template.load = load_view(template)
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template.load_file = load_file(template.load)
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template.load_string = load_string(template.load)
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template.print = write
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local load_chunk = loader(template)
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local caching
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if VAR_PHASES and VAR_PHASES[phase()] then
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caching = enabled(var.template_cache)
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else
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caching = true
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end
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local visitors
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function template.visit(func)
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if not visitors then
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visitors = { func, n = 1 }
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return
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end
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visitors.n = visitors.n + 1
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visitors[visitors.n] = func
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end
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function template.caching(enable)
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if enable ~= nil then caching = enable == true end
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return caching
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end
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function template.output(s)
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if s == nil or s == null then return EMPTY end
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if type(s) == "function" then return template.output(s()) end
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return tostring(s)
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end
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function template.escape(s, c)
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if type(s) == "string" then
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if c then return gsub(s, "[}{\">/<'&]", CODE_ENTITIES) end
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return gsub(s, "[\">/<'&]", HTML_ENTITIES)
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end
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return template.output(s)
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end
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function template.new(view, layout)
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local vt = type(view)
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if vt == "boolean" then return new(nil, view) end
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if vt == "table" then return new(view, safe) end
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if vt == "nil" then return new(nil, safe) end
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local render
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local process
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if layout then
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if type(layout) == "table" then
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render = function(self, context)
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context = context or self
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context.blocks = context.blocks or {}
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context.view = template.process(view, context)
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layout.blocks = context.blocks or {}
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layout.view = context.view or EMPTY
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layout:render()
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end
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process = function(self, context)
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context = context or self
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context.blocks = context.blocks or {}
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context.view = template.process(view, context)
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layout.blocks = context.blocks or {}
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layout.view = context.view
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return tostring(layout)
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end
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else
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render = function(self, context)
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context = context or self
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context.blocks = context.blocks or {}
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context.view = template.process(view, context)
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template.render(layout, context)
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end
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process = function(self, context)
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context = context or self
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context.blocks = context.blocks or {}
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context.view = template.process(view, context)
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return template.process(layout, context)
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end
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end
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else
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render = function(self, context)
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return template.render(view, context or self)
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end
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process = function(self, context)
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return template.process(view, context or self)
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end
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end
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if safe then
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return setmetatable({
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render = function(...)
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local ok, err = pcall(render, ...)
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if not ok then
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return nil, err
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end
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end,
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process = function(...)
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local ok, output = pcall(process, ...)
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if not ok then
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return nil, output
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end
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return output
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end,
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}, {
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__tostring = function(...)
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local ok, output = pcall(process, ...)
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if not ok then
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return ""
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end
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return output
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end })
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end
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return setmetatable({
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render = render,
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process = process
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}, {
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__tostring = process
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})
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end
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function template.precompile(view, path, strip, plain)
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local chunk = dump(template.compile(view, nil, plain), strip ~= false)
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if path then
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local file = open(path, "wb")
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file:write(chunk)
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file:close()
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end
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return chunk
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end
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function template.precompile_string(view, path, strip)
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return template.precompile(view, path, strip, true)
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end
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function template.precompile_file(view, path, strip)
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return template.precompile(view, path, strip, false)
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end
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function template.compile(view, cache_key, plain)
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assert(view, "view was not provided for template.compile(view, cache_key, plain)")
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if cache_key == "no-cache" then
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return load_chunk(template.parse(view, plain)), false
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end
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cache_key = cache_key or view
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local cache = template.cache
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if cache[cache_key] then return cache[cache_key], true end
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local func = load_chunk(template.parse(view, plain))
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if caching then cache[cache_key] = func end
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return func, false
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end
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function template.compile_file(view, cache_key)
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return template.compile(view, cache_key, false)
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end
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function template.compile_string(view, cache_key)
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return template.compile(view, cache_key, true)
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end
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function template.parse(view, plain)
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assert(view, "view was not provided for template.parse(view, plain)")
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if plain ~= true then
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view = template.load(view, plain)
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if byte(view, 1, 1) == ESC then return view end
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end
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local j = 2
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local c = {[[
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context=... or {}
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local ___,blocks,layout={},blocks or {}
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local function include(v, c) return template.process(v, c or context) end
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local function echo(...) for i=1,select("#", ...) do ___[#___+1] = tostring(select(i, ...)) end end
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]] }
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local i, s = 1, find(view, "{", 1, true)
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while s do
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local t, p = byte(view, s + 1, s + 1), s + 2
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if t == LCUB then
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local e = find(view, "}}", p, true)
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if e then
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local z, w = escaped(view, s)
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if i < s - w then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
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c[j+2] = "]=]\n"
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j=j+3
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end
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if z then
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i = s
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else
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c[j] = "___[#___+1]=template.escape("
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c[j+1] = visit(visitors, trim(sub(view, p, e - 1)), "{")
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c[j+2] = ")\n"
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j=j+3
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s, i = e + 1, e + 2
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end
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end
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elseif t == AST then
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local e = find(view, "*}", p, true)
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if e then
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local z, w = escaped(view, s)
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if i < s - w then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
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c[j+2] = "]=]\n"
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j=j+3
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end
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if z then
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i = s
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else
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c[j] = "___[#___+1]=template.output("
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c[j+1] = visit(visitors, trim(sub(view, p, e - 1)), "*")
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c[j+2] = ")\n"
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j=j+3
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s, i = e + 1, e + 2
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end
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end
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elseif t == PERCNT then
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local e = find(view, "%}", p, true)
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if e then
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local z, w = escaped(view, s)
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if z then
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if i < s - w then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
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c[j+2] = "]=]\n"
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j=j+3
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end
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i = s
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else
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local n = e + 2
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if byte(view, n, n) == LF then
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n = n + 1
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end
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local r = rpos(view, s - 1)
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if i <= r then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, r))
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c[j+2] = "]=]\n"
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j=j+3
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end
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c[j] = visit(visitors, trim(sub(view, p, e - 1)), "%")
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c[j+1] = "\n"
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j=j+2
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s, i = n - 1, n
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end
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end
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elseif t == LPAR then
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local e = find(view, ")}", p, true)
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if e then
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local z, w = escaped(view, s)
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if i < s - w then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
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c[j+2] = "]=]\n"
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j=j+3
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end
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if z then
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i = s
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else
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local f = visit(visitors, sub(view, p, e - 1), "(")
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local x = find(f, ",", 2, true)
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if x then
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c[j] = "___[#___+1]=include([=["
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c[j+1] = trim(sub(f, 1, x - 1))
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c[j+2] = "]=],"
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c[j+3] = trim(sub(f, x + 1))
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c[j+4] = ")\n"
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j=j+5
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else
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c[j] = "___[#___+1]=include([=["
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c[j+1] = trim(f)
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c[j+2] = "]=])\n"
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j=j+3
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end
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s, i = e + 1, e + 2
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end
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end
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elseif t == LSQB then
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local e = find(view, "]}", p, true)
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if e then
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local z, w = escaped(view, s)
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if i < s - w then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
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c[j+2] = "]=]\n"
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j=j+3
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end
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if z then
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i = s
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else
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c[j] = "___[#___+1]=include("
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c[j+1] = visit(visitors, trim(sub(view, p, e - 1)), "[")
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c[j+2] = ")\n"
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j=j+3
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s, i = e + 1, e + 2
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end
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end
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elseif t == MINUS then
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local e = find(view, "-}", p, true)
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if e then
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local x, y = find(view, sub(view, s, e + 1), e + 2, true)
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if x then
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local z, w = escaped(view, s)
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if z then
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if i < s - w then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
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c[j+2] = "]=]\n"
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j=j+3
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end
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i = s
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else
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y = y + 1
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x = x - 1
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if byte(view, y, y) == LF then
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y = y + 1
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end
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local b = trim(sub(view, p, e - 1))
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if b == "verbatim" or b == "raw" then
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if i < s - w then
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c[j] = "___[#___+1]=[=[\n"
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c[j+1] = visit(visitors, sub(view, i, s - 1 - w))
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c[j+2] = "]=]\n"
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j=j+3
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end
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c[j] = "___[#___+1]=[=["
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c[j+1] = visit(visitors, sub(view, e + 2, x))
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c[j+2] = "]=]\n"
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j=j+3
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else
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if byte(view, x, x) == LF then
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x = x - 1
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end
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local r = rpos(view, s - 1)
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|
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()
|