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Published 25 days ago • verified publisherleehack.com• Latest: 1.3.0
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Jinja engine for Hugging Face and GGUF LLM chat templates: messages, tools, generation prompts. Parity-tested against llama.cpp and Jinja2. All platforms, including web and Wasm.

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1.2.0 #

  • Rewrote the README and example around rendering a chat template, and updated the pubspec description and topics.
  • Fixed lstrip_blocks keeping the indentation before a {% or {# on the line after a block tag, as in {% if x %}\n {% set y = 1 %}. It is now removed, as in llama.cpp and Jinja2. Qwen3-Coder, GLM-4.6, GLM-4.7-Flash, MiniMax-M2, Nemotron-3-Nano and Command R7B prompts no longer contain stray spaces.
  • Fixed strftime_now supporting only %Y %m %d %H %M %S. It now formats as llama.cpp does, with C strftime in the C locale as glibc implements it: every conversion (%b, %B, %a, %c, %% and the rest), flags and widths. Like llama.cpp, it throws without a string argument and when the result is empty or 100 bytes or longer.
  • Fixed continue and break dropping what the loop pass had already rendered: {% for i in [1, 2] %}{{ i }}{% continue %}{% endfor %} is now 12. A for loop's else block now runs when no pass finishes without continue or break, as in llama.cpp and Jinja2. Output rendered in a nested block before the signal is kept, as in Jinja2; llama.cpp drops it. Output captured by a block set, a filter block, a macro or a caller() body that the signal leaves is discarded, as in llama.cpp.
  • Fixed input-marked values in a for loop, including its else block, being escaped twice: {% for i in [1] %}{{ x }}{% endfor %} with x = JinjaString.user('<b>') is now &lt;b&gt;.
  • Fixed caller() rendering None for a body statement without output, such as {% set %} or a comment, and not escaping JinjaString.user values in the body.
  • Fixed select, reject, selectattr, rejectattr and unique on none returning none, so none | selectattr(...) | list was [None]. They now return an empty list, as in llama.cpp. This fixes the functionary v3.1 prompt without tools. default now also replaces none, as in llama.cpp.
  • Fixed macro keyword arguments binding by position, which rendered greet(last='Smith', first='John') with empty values and made add(1, b=10) throw. Arguments now bind positionally, then by name, then from defaults, as in llama.cpp and Jinja2, including caller(...) arguments in a {% call %} block. A missing required argument throws Not enough arguments provided, as in llama.cpp; an unknown keyword or a keyword repeating a positional argument throws, as in Jinja2.
  • Fixed unary - and + failing to parse before anything but a number literal, as in {{ -n }}, {{ items[:-n] }} and {{ not -n }}. As in llama.cpp and Jinja2, they bind tighter than filters, tests and **: -n|abs is (-n)|abs.
  • Fixed min and max with attribute returning the attribute value instead of the item, as Jinja2 does. attribute can also be the second positional argument.
  • Added llama.cpp's numeric member access ({{ items.0 }}, {{ {10: 'Bob'}.10 }}), empty subscript (a[] is undefined), int * str repetition, string indent width (indent('> ')) and str.format with {} placeholders. Other format fields, such as {0}, {name}, {{ and {:>5}, throw, as in llama.cpp.
  • Added BlankExpression to package:dinja/ast.dart for the a[] subscript.
  • Fixed the README and example/security_example.dart claiming that plain strings passed to render are escaped; only values wrapped in JinjaString.user are.
  • Fixed template text containing " " (eight spaces in double quotes) being deleted from the output.
  • Fixed indent adding a newline to input that ends with one: 'foo\n'|indent is now foo\n, as in llama.cpp and Jinja2. An empty string stays empty with first=true, as in llama.cpp.
  • Changed tests that take an argument, such as divisibleby, eq and in, to throw when called without one, as llama.cpp and Jinja2 do. a is divisibleby -a is (a is divisibleby) - a in both, so it now throws instead of rendering -2.
  • Changed * argument unpacking, as in f(*items), to throw, as llama.cpp does. It used to pass the list as a single argument.
  • Added the format filter as llama.cpp has it: it calls str.format, so '{}-{}'|format(1, 2) is 1-2. Jinja2's %-style formatting is not supported: '%s'|format(x) returns %s.

1.1.1 #

  • Fixed tojson to match llama.cpp: json.dumps spacing ({"a": 1, "b": [1, 2]}), non-ASCII kept unless ensure_ascii=true, floats formatted as C++ %g with 6 significant digits (1.0 is 1, 3.14159265 is 3.14159), non-string keys converted to strings, and positional arguments read as (ensure_ascii, indent, separators, sort_keys). A negative or non-integer indent now gives one-line output, and one separator sets only the item separator.
  • Fixed printing a list, dict or tuple HTML-escaping its quotes: {{ [1, '1'] }} now prints [1, '1']. Input-marked items are still escaped.
  • Fixed -0.0 and numbers outside the 64-bit integer range passed to render becoming integers on the web; they are now floats, as on the VM. Other whole-number doubles are still integers on the web, where they are indistinguishable from int.
  • Changed list, dict and tuple string conversion to match llama.cpp: a string item containing ' is written in JSON form, as in ["it's"].

1.1.0 #

  • Added package:dinja/ast.dart for template analysis without importing src/: parseTemplate, which parses a template into a Program; the AST node types; and LexerException and ParserException. package:dinja/dinja.dart is unchanged.
  • Fixed string equality to compare content only: ''.strip() == '' is now true, and safe or input-marked strings equal plain ones.
  • Removed a debug print to stdout when a for loop iterates a function; the error now names the function.
  • Fixed tests with one unparenthesized argument, such as 1 is eq 1 and 'a' is in ['a'], which failed to parse. As in Jinja2, a value after a test without a comma is now its argument: [x is odd 1] means [x is odd(1)].
  • Fixed unique to compare items with Python equality: [1, '1'] keeps both, [1, 1.0, true] keeps one. It now ignores string case by default, as Jinja2 does.
  • Fixed a ParserException at the end of the template reporting position -1; it now reports the end of the template.
  • Fixed an incomplete expression at the end of the template, such as {{ 1 +, throwing RangeError instead of ParserException.
  • Fixed ParserException from Template on templates with \r\n or a trailing newline: its source, pos, line and col now all refer to the normalized text, as with parseTemplate.
  • Changed unique to follow Jinja2's signature, unique(case_sensitive=false, attribute=none): the first positional argument is now case_sensitive, not attribute. unique now also deduplicates the characters of a string and the keys of a dict.
  • Fixed input marking being dropped by ~, string repetition (*), replace, capitalize, title, string, indent and the last piece of split (first of rsplit), matching llama.cpp. Input-marked text from these is now escaped on output like {{ value }}. join still drops the marking, as in llama.cpp.
  • Fixed double escaping when an escaped block, such as a {% set %} block or macro output, is joined with + to plain text.

1.0.0 #

  • Initial release of Dinja.
  • Minimal Jinja2 implementation ported from llama.cpp.
  • Support for LLM chat templates.
  • Secure input marking system.
  • Fixed unused declaration in nodes.dart.
  • Fixed not in operator logic for Maps.
  • Fixed duplicate key in builtins.dart.
  • Added cross-compatibility generation script (script/generate_cross_test.py).

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Jinja engine for Hugging Face and GGUF LLM chat templates: messages, tools, generation prompts. Parity-tested against llama.cpp and Jinja2. All platforms, including web and Wasm.

Repository (GitHub)
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Topics

#jinja #template #llm #chat-templates #huggingface

License

MIT (license)

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