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101 lines
3.1 KiB
Text
101 lines
3.1 KiB
Text
-- render(template, stanza) --> string
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-- {path} --> stanza:find(path)
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-- {{ns}name/child|each({ns}name){sub-template}}
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--[[
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template ::= "{" path ("|" name ("(" args ")")? (template)? )* "}"
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path ::= defined by util.stanza
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name ::= %w+
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args ::= anything with balanced ( ) pairs
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]]
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local s_gsub = string.gsub;
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local s_match = string.match;
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local s_sub = string.sub;
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local t_concat = table.concat;
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local st = require "util.stanza";
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local type escape_t = function (string) : string
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local type filter_t = function (string, string | st.stanza_t, string) : string | st.stanza_t, boolean
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local type filter_coll = { string : filter_t }
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local function render(template : string, root : st.stanza_t, escape : escape_t, filters : filter_coll) : string
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escape = escape or st.xml_escape;
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return (s_gsub(template, "%b{}", function(block : string) : string
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local inner = s_sub(block, 2, -2);
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local path, pipe, pos = s_match(inner, "^([^|]+)(|?)()");
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if not path is string then return end
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local value : string | st.stanza_t
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if path == "." then
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value = root;
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elseif path == "#" then
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value = root:get_text();
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else
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value = root:find(path);
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end
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local is_escaped = false;
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while pipe == "|" do
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local func, args, tmpl, p = s_match(inner, "^(%w+)(%b())(%b{})()", pos as integer);
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if not func then func, args, p = s_match(inner, "^(%w+)(%b())()", pos as integer); end
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if not func then func, tmpl, p = s_match(inner, "^(%w+)(%b{})()", pos as integer); end
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if not func then func, p = s_match(inner, "^(%w+)()", pos as integer); end
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if not func then break end
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if tmpl then tmpl = s_sub(tmpl, 2, -2); end
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if args then args = s_sub(args, 2, -2); end
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if func == "each" and tmpl and st.is_stanza(value) then
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if not args then value, args = root, path; end
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local ns, name = s_match(args, "^(%b{})(.*)$");
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if ns then ns = s_sub(ns, 2, -2); else name, ns = args, nil; end
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if ns == "" then ns = nil; end
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if name == "" then name = nil; end
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local out, i = {}, 1;
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for c in (value as st.stanza_t):childtags(name, ns) do
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out[i], i = render(tmpl, c, escape, filters), i + 1;
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end
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value = t_concat(out);
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is_escaped = true;
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elseif func == "and" and tmpl then
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local condition = value;
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if args then condition = root:find(args); end
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if condition then
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value = render(tmpl, root, escape, filters);
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is_escaped = true;
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end
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elseif func == "or" and tmpl then
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local condition = value;
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if args then condition = root:find(args); end
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if not condition then
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value = render(tmpl, root, escape, filters);
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is_escaped = true;
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end
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elseif filters and filters[func] then
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local f = filters[func];
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if args == nil then
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value, is_escaped = f(value, tmpl);
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else
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value, is_escaped = f(args, value, tmpl);
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end
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else
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error("No such filter function: " .. func);
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end
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pipe, pos = s_match(inner, "^(|?)()", p as integer);
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end
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if value is string then
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if not is_escaped then value = escape(value); end
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return value;
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elseif st.is_stanza(value) then
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value = value:get_text();
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if value then
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return escape(value);
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end
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end
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return "";
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end));
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end
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return { render = render };
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