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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', tostring(name),
tostring(value), path, 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, "<", "<" )
return string.gsub (str, ">", ">" )
end
-- return a name,value pair as a string.
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" ', name , ( value or "" ) ))
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 type="%s" ', field_type )
for i,k in ipairs ( {
"name", "size", "checked", "maxlength",
"value", "length", "class", "id", "src",
"align", "alt",
"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 acf_www-controller.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"
} ) do
str = str .. nv_pair ( k, v[k] )
end
str = str .. nv_pair (nil, v.disabled)
return ( str .. ">" .. (v.value or "" ) .. "</textarea>" )
end
function form.passwd ( 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
-- 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"
} ) do
str = str .. nv_pair ( k, v[k] )
end
if ( v.disabled ~= nil ) then
str = str .. " disabled"
end
str = str .. ">"
-- now the options
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 ( v.value == val ) then
str = str .. " selected "
end
str = str .. nv_pair("value", val) .. ">" .. k .. "</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", v.class ),
nv_pair ( "method", v.method),
nv_pair ( "action", 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>",
tag,
nv_pair ("class", class),
nv_pair("id", id), text , 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 .. ">" .. (v.label or "" ) .. "</a>" )
end
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