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util.xtemplate: Adopt {-path-} syntax to strip preceding and/or trailing whitespace

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Seen in some other template languages
This commit is contained in:
Kim Alvefur 2023-12-09 14:57:41 +01:00
parent 48f26f9b98
commit c61c78447b
2 changed files with 24 additions and 8 deletions
teal-src/prosody/util
xtemplate.tl

16
teal-src/prosody/util/xtemplate.tl
View file

@ -23,8 +23,16 @@ local type filter_coll = { string : filter_t }
local function render(template : string, root : st.stanza_t, escape : escape_t, filters : filter_coll) : string
escape = escape or st.xml_escape;
return (s_gsub(template, "%b{}", function(block : string) : string
return (s_gsub(template, "(%s*)(%b{})(%s*)", function(pre_blank : string, block : string, post_blank : string) : string
local inner = s_sub(block, 2, -2);
if inner:sub(1, 1) == "-" then
pre_blank = "";
inner = inner:sub(2);
end
if inner:sub(-1, -1) == "-" then
post_blank = "";
inner = inner:sub(1, -2);
end
local path, pipe, pos = s_match(inner, "^([^|]+)(|?)()");
if not path is string then return end
local value : string | st.stanza_t
@ -87,14 +95,14 @@ local function render(template : string, root : st.stanza_t, escape : escape_t,
if value is string then
if not is_escaped then value = escape(value); end
return value;
return pre_blank .. value .. post_blank;
elseif st.is_stanza(value) then
value = value:get_text();
if value then
return escape(value);
return pre_blank .. escape(value) .. post_blank;
end
end
return "";
return pre_blank .. post_blank;
end));
end