diff options
Diffstat (limited to 'lib/html.lua')
| -rw-r--r-- | lib/html.lua | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/lib/html.lua b/lib/html.lua new file mode 100644 index 0000000..7e60c2c --- /dev/null +++ b/lib/html.lua @@ -0,0 +1,245 @@ +--[[ 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 + |