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--[[ lowlevel html functions
Written for Alpine Configuration Framework (ACF) -- see www.alpinelinux.org
Copyright (C) 2007 Nathan Angelacos
Licensed under the terms of GPL2
]]--
module (..., package.seeall)
--[[ Cookie functions ]]------------------------------------------------------
cookie={}
-- Set a cookie - returns a string suitable for setting a cookie
-- if the value is the boolean "false", then set the cookie to expire
cookie.set = function ( name, value, path )
local expires = ""
if name == nil then
return ("")
end
if value == false then
expires = 'expires=Thu Jan 1 00:00:00 EST 1970'
value = ""
end
if path == nil then
path = "/"
end
return (string.format('Set-Cookie: %s=%s; path=%s; %s\n', html_escape(tostring(name)),
html_escape(tostring(value)), html_escape(path), html_escape(expires)))
end
-- wrapper function to clear a cookie
cookie.unset = function ( name, path)
return cookie.set (name, false, path)
end
-- escape unsafe html characters
function html_escape (text )
text = text or ""
local str = string.gsub (text, "&", "&" )
str = string.gsub (str, "<", "<" )
str = string.gsub (str, ">", ">" )
str = string.gsub (str, "'", "'" )
return (string.gsub (str, '"', """ ))
end
-- return a name,value pair as a string.
local nv_pair = function ( name, value)
if ( name == nil ) then
return ( value or "" )
end
if ( type(value) == "boolean" ) then
value = tostring(value)
end
if ( value == nil ) then
return ( "" )
else
return (string.format (' %s="%s" ', html_escape(name) , html_escape(value) ))
end
end
--[[
each of these functions take a table that has an associative array of
the values we might care about:
value -- this is the value in the form element, or the selected element
name -- this is the name of the element
cols, rows
class
id
etc.
]]--
local generic_input = function ( field_type, v )
if type(v.value) == "table" then
ret = {}
local vals = v.value
for n, val in ipairs(vals) do
v.value = val
table.insert(ret, generic_input(field_type, v))
end
v.value = vals
return table.concat(ret)
end
if ( field_type == nil ) then
return nil
end
local str = string.format ( '<input class="%s" type="%s" ', html_escape(field_type), html_escape(field_type) )
for i,k in ipairs ( {
"name", "size", "checked", "maxlength",
"value", "length", "class", "id", "src",
"align", "alt", "contenteditable", "readonly",
"tabindex", "accesskey", "onfocus", "onblur"
} ) do
str = str .. nv_pair ( k, v[k] )
end
if ( v.disabled ~= nil ) then
str = str .. " disabled"
end
return ( str .. ">" )
end
--[[ Form functions ]]------------------------------------------------------
-- These expect something like a cfe to work (see mvc.lua)
form = {}
form.text = function ( v )
return generic_input ( "text", v )
end
form.longtext = function ( v )
local str = "<textarea"
for i,k in ipairs ( {
"name", "rows", "cols",
"class", "id", "tabindex", "accesskey",
"onfocus", "onblur", "readonly"
} ) do
str = str .. nv_pair ( k, v[k] )
end
str = str .. nv_pair (nil, v.disabled)
return ( str .. ">" .. html_escape(v.value) .. "</textarea>" )
end
function form.password ( v )
return generic_input ( "password", v )
end
function form.hidden ( v )
return generic_input ( "hidden", v )
end
function form.submit ( v )
return generic_input ( "submit", v )
end
function form.action (v)
return generic_input ("submit", v)
end
function form.file ( v )
return generic_input ( "file", v )
end
function form.image ( v )
return generic_input ( "image", v )
end
-- v.value is the selected item (or an array if multiple)
-- v.option is an array of valid options
-- NOTE use of value and values (plural)
function form.select ( v )
if ( v.name == nil ) then
return nil
end
local str = "<select"
for i,k in ipairs ( {
"name", "size", "tabindex", "accesskey",
"onfocus", "onblur", "onchange", "id",
"class", "multiple"
} ) do
str = str .. nv_pair ( k, v[k] )
end
if ( v.disabled ~= nil ) then
str = str .. " disabled"
end
str = str .. ">"
-- now the options
local reverseval = {}
if type(v.value) == "table" then
for x,val in ipairs(v.value) do
reverseval[val]=x
end
end
local selected = false
for i, k in ipairs ( v.option ) do
local val = k
local txt = nil
if type(val) == "table" then
txt=val[1]
val=val[0]
end
str = str .. "<option "
if type(v.value) == "table" then
if reverseval[val] then
str = str .. " selected"
selected = true
end
elseif ( v.value == val ) then
str = str .. " selected"
selected = true
end
str = str .. nv_pair("value", val) .. ">" .. html_escape(val) .. "</option>"
end
if not selected then
str = str .. '<option selected value="' .. html_escape(v.value) ..'">[' .. html_escape(v.value) .. ']</option>'
end
str = str .. "</select>"
return (str)
end
function form.checkbox ( v )
return generic_input ( "checkbox", v )
end
-- NOTE: VALUE of a form is a table containing the form elements ...
function form.start ( v)
if ( v.action == nil ) then
return nil
end
local method = v.method or "get"
return ( string.format (
'<form %s%s%s>',
nv_pair ( "class", html_escape(v.class) ),
nv_pair ( "method", html_escape(v.method) ),
nv_pair ( "action", html_escape(v.action) )
) )
end
function form.stop ( )
return ("</form>")
end
-- For "h1, h2, p," etc
-- WARNING - Text is printed verbatim - you may want to
-- wrap the text in html_escape
function entity (tag, text, class, id)
return ( string.format (
"<%s%s%s>%s</%s>",
html_escape(tag),
nv_pair ("class", class),
nv_pair("id", id), html_escape(text), html_escape(tag))
)
end
function link ( v )
if ( v.value == nil ) then
return nil
end
local str = nv_pair ( "href", v.value )
for i,k in ipairs( { "class", "id" }) do
str = str .. nv_pair ( k, v[k] )
end
return ( "<a " .. str .. ">" .. html_escape(v.label) .. "</a>" )
end
-- give a cfe and get back a string of what is inside
-- great for troubleshotting and seeing what is really being passed to the view
function cfe_unpack ( a )
if type(a) == "table" then
value = session.serialize("cfe", a)
value = "<pre>" .. html_escape(value) .. "</pre>"
return value
end
end
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