Custom delimiters do not work in nested partials

[aielo]

Custom delimiters only work in the template itself and its (level 1) partials (thanks to #679). For inner partials (level 2+), however, default tags are used rather than the custom ones provided in render.

This behavior can be reproduced with the sample code:

const Mustache = require("mustache");
const tags = ["[[", "]]"];
const partials = {};

for (let l = 1; l <= 5; l++) {
  partials["level" + l] = `partial level ${l}\n`;
  if (l < 5) {
    partials["level" + l] += `${tags[0]}> level${l + 1} ${tags[1]}`;
  }
}

const output = Mustache.render(
  `template\n${tags[0]}> level1 ${tags[1]}`,
  {}, partials, tags
);

console.log(output);

Double brackets are set as custom tags in const tags = ["[[", "]]"], and it outputs:

template       
partial level 1
partial level 2
[[> level3 ]]

[[> level1 ]] in template and [[> level2 ]] in the first level partial are properly resolved, while the first inner partial [[> level3 ]] is left unresolved.

Switching to const tags = ["[[{{", "}}]]"], and keeping the curly brackets within custom delimiters, it outputs:

template
partial level 1      
partial level 2      
[[partial level 3    
  [[partial level 4  
    [[partial level 5
]]]]]]

Here, custom tags are again used in template and first level partial. Default Mustache tags are then used in inner partials, rendering them wrongly.

Overriding Mustache.tags works normally. Changing the sample code:

...
Mustache.tags = ["[[", "]]"];
const tags = Mustache.tags; // just to generate test partials
...
const output = Mustache.render(
  `template\n${tags[0]}> level1 ${tags[1]}`,
  {}, partials // no custom tags
);
...

Output is the expected:

template       
partial level 1
partial level 2
partial level 3
partial level 4
partial level 5

[phillipj]

Very sorry for the late response, been more busy than usual lately.

Thanks a bunch for the very elaborate description of what you've stumbled onto and steps to reproduce, much appreciated 👍