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util/xtemplate.lua @ 12518:73ee3855f970
mod_smacks: Factor out some convenience functions
Those lines are long and the risk of mistakes if another one needs to be
added seems high, but lower when factored out like this.
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 11 Feb 2022 16:09:42 +0100 |
parent | 12213:dc9d63166488 |
child | 12975:d10957394a3c |
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local s_gsub = string.gsub; local s_match = string.match; local s_sub = string.sub; local t_concat = table.concat; local st = require("util.stanza"); local function render(template, root, escape, filters) escape = escape or st.xml_escape; return (s_gsub(template, "%b{}", function(block) local inner = s_sub(block, 2, -2); local path, pipe, pos = s_match(inner, "^([^|]+)(|?)()"); if not (type(path) == "string") then return end local value if path == "." then value = root; elseif path == "#" then value = root:get_text(); else value = root:find(path); end local is_escaped = false; while pipe == "|" do local func, args, tmpl, p = s_match(inner, "^(%w+)(%b())(%b{})()", pos); if not func then func, args, p = s_match(inner, "^(%w+)(%b())()", pos); end if not func then func, tmpl, p = s_match(inner, "^(%w+)(%b{})()", pos); end if not func then func, p = s_match(inner, "^(%w+)()", pos); end if not func then break end if tmpl then tmpl = s_sub(tmpl, 2, -2); end if args then args = s_sub(args, 2, -2); end if func == "each" and tmpl and st.is_stanza(value) then if not args then value, args = root, path; end local ns, name = s_match(args, "^(%b{})(.*)$"); if ns then ns = s_sub(ns, 2, -2); else name, ns = args, nil; end if ns == "" then ns = nil; end if name == "" then name = nil; end local out, i = {}, 1; for c in (value):childtags(name, ns) do out[i], i = render(tmpl, c, escape, filters), i + 1; end value = t_concat(out); is_escaped = true; elseif func == "and" and tmpl then local condition = value; if args then condition = root:find(args); end if condition then value = render(tmpl, root, escape, filters); is_escaped = true; end elseif func == "or" and tmpl then local condition = value; if args then condition = root:find(args); end if not condition then value = render(tmpl, root, escape, filters); is_escaped = true; end elseif filters and filters[func] then local f = filters[func]; if args == nil then value, is_escaped = f(value, tmpl); else value, is_escaped = f(args, value, tmpl); end else error("No such filter function: " .. func); end pipe, pos = s_match(inner, "^(|?)()", p); end if type(value) == "string" then if not is_escaped then value = escape(value); end return value elseif st.is_stanza(value) then value = value:get_text(); if value then return escape(value) end end return "" end)) end return { render = render }