Class: Tina4::Frond

Inherits:
Object
  • Object
show all
Defined in:
lib/tina4/frond.rb

Defined Under Namespace

Classes: LoopContext

Constant Summary collapse

TEXT =

– Token types ———————————————————-

:text
VAR =

… }

:var
BLOCK =

… %

:block
COMMENT =

… #

:comment
TOKEN_RE =

Regex to split template source into tokens

/(\{%-?\s*.*?\s*-?%\})|(\{\{-?\s*.*?\s*-?\}\})|(\{#.*?#\})/m
HTML_ESCAPE_MAP =

HTML escape table

{ "&" => "&amp;", "<" => "&lt;", ">" => "&gt;",
'"' => "&quot;", "'" => "&#39;" }.freeze
HTML_ESCAPE_RE = 
/[&<>"']/
EXTENDS_RE =

– Compiled regex constants (optimization: avoid re-compiling in methods) –

/\{%-?\s*extends\s+["'](.+?)["']\s*-?%\}/
BLOCK_RE = 
/\{%-?\s*block\s+(\w+)\s*-?%\}(.*?)\{%-?\s*endblock\s*-?%\}/m
STRING_LIT_RE = 
/\A["'](.*)["']\z/
INTEGER_RE = 
/\A-?\d+\z/
FLOAT_RE = 
/\A-?\d+\.\d+\z/
ARRAY_LIT_RE = 
/\A\[(.+)\]\z/m
HASH_LIT_RE = 
/\A\{(.+)\}\z/m
HASH_PAIR_RE = 
/\A\s*(?:["']([^"']+)["']|(\w+))\s*:\s*(.+)\z/
RANGE_LIT_RE = 
/\A(\d+)\.\.(\d+)\z/
ARITHMETIC_OPS = 
[" + ", " - ", " * ", " // ", " / ", " % ", " ** "].freeze
FUNC_CALL_RE = 
/\A(\w+)\s*\((.*)\)\z/m
FILTER_WITH_ARGS_RE = 
/\A(\w+)\s*\((.*)\)\z/m
FILTER_CMP_RE = 
/\A(\w+)\s*(!=|==|>=|<=|>|<)\s*(.+)\z/
OR_SPLIT_RE = 
/\s+or\s+/
AND_SPLIT_RE = 
/\s+and\s+/
IS_NOT_RE = 
/\A(.+?)\s+is\s+not\s+(\w+)(.*)\z/
IS_RE = 
/\A(.+?)\s+is\s+(\w+)(.*)\z/
NOT_IN_RE = 
/\A(.+?)\s+not\s+in\s+(.+)\z/
IN_RE = 
/\A(.+?)\s+in\s+(.+)\z/
DIVISIBLE_BY_RE = 
/\s*by\s*\(\s*(\d+)\s*\)/
RESOLVE_SPLIT_RE = 
/\.|\[([^\]]+)\]/
RESOLVE_STRIP_RE = 
/\A["']|["']\z/
DIGIT_RE = 
/\A\d+\z/
FOR_RE = 
/\Afor\s+(\w+)(?:\s*,\s*(\w+))?\s+in\s+(.+)\z/
SET_RE = 
/\Aset\s+(\w+)\s*=\s*(.+)\z/m
INCLUDE_RE = 
/\Ainclude\s+["'](.+?)["'](?:\s+with\s+(.+))?\z/
MACRO_RE = 
/\Amacro\s+(\w+)\s*\(([^)]*)\)/
FROM_IMPORT_RE = 
/\Afrom\s+["'](.+?)["']\s+import\s+(.+)/
CACHE_RE = 
/\Acache\s+["'](.+?)["']\s*(\d+)?/
SPACELESS_RE = 
/>\s+</
AUTOESCAPE_RE = 
/\Aautoescape\s+(false|true)/
STRIPTAGS_RE = 
/<[^>]+>/
THOUSANDS_RE = 
/(\d)(?=(\d{3})+(?!\d))/
SLUG_CLEAN_RE = 
/[^a-z0-9]+/
SLUG_TRIM_RE = 
/\A-|-\z/
INLINE_FILTERS =

Set of common no-arg filter names that can be inlined for speed

%w[upper lower length trim capitalize title string int escape e].each_with_object({}) { |f, h| h[f] = true }.freeze

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(template_dir: "src/templates") ⇒ Frond

Returns a new instance of Frond.



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# File 'lib/tina4/frond.rb', line 159

def initialize(template_dir: "src/templates")
  @template_dir    = template_dir
  @filters         = default_filters
  @globals         = {}
  @tests           = default_tests
  @auto_escape     = true

  # Sandboxing
  @sandbox         = false
  @allowed_filters = nil
  @allowed_tags    = nil
  @allowed_vars    = nil

  # Fragment cache: key => [html, expires_at]
  @fragment_cache  = {}

  # Token pre-compilation cache
  @compiled         = {}  # {template_name => [tokens, mtime]}
  @compiled_strings = {}  # {md5_hash => tokens}

  # Parsed filter chain cache: expr_string => [variable, filters]
  @filter_chain_cache = {}

  # Resolved dotted-path split cache: expr_string => parts_array
  @resolve_cache = {}

  # Sandbox root-var split cache: var_name => root_var_string
  @dotted_split_cache = {}

  # Built-in global functions
  register_builtin_globals
end

Class Attribute Details

.form_token_session_id ⇒ Object

Returns the value of attribute form_token_session_id.



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# File 'lib/tina4/frond.rb', line 2043

def form_token_session_id
  @form_token_session_id
end

Instance Attribute Details

#template_dir ⇒ Object (readonly)

Public API



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# File 'lib/tina4/frond.rb', line 157

def template_dir
  @template_dir
end

Class Method Details

.escape_html(str) ⇒ Object

Utility: HTML escape



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# File 'lib/tina4/frond.rb', line 286

def self.escape_html(str)
  str.to_s.gsub(HTML_ESCAPE_RE, HTML_ESCAPE_MAP)
end

.generate_form_jwt(descriptor = "") ⇒ String

Generate a raw JWT form token string.

Parameters:

  • descriptor (String) (defaults to: "") —

    Optional string to enrich the token payload.

    • Empty: payload is => “form”

    • “admin_panel”: payload is => “form”, “context” => “admin_panel”

    • “checkout|order_123”: payload is => “form”, “context” => “checkout”, “ref” => “order_123”

Returns:

  • (String) —

    The raw JWT token string.



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# File 'lib/tina4/frond.rb', line 2062

def self.generate_form_jwt(descriptor = "")
  require_relative "log"
  require_relative "auth"

  payload = { "type" => "form", "nonce" => SecureRandom.hex(8) }
  if descriptor && !descriptor.empty?
    if descriptor.include?("|")
      parts = descriptor.split("|", 2)
      payload["context"] = parts[0]
      payload["ref"] = parts[1]
    else
      payload["context"] = descriptor
    end
  end

  # Include session_id for CSRF session binding
  sid = form_token_session_id.to_s
  payload["session_id"] = sid unless sid.empty?

  ttl_minutes = (ENV["TINA4_TOKEN_LIMIT"] || "60").to_i
  expires_in = ttl_minutes * 60
  Tina4::Auth.create_token(payload, expires_in: expires_in)
end

.generate_form_token(descriptor = "") ⇒ Object 



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# File 'lib/tina4/frond.rb', line 2086

def self.generate_form_token(descriptor = "")
  token = generate_form_jwt(descriptor)
  Tina4::SafeString.new(%(<input type="hidden" name="formToken" value="#{CGI.escapeHTML(token)}">))
end

.generate_form_token_value(descriptor = "") ⇒ Object

Return just the raw JWT form token string (no <input> wrapper). Registered as both formTokenValue and form_token_value template globals.



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# File 'lib/tina4/frond.rb', line 2093

def self.generate_form_token_value(descriptor = "")
  Tina4::SafeString.new(generate_form_jwt(descriptor))
end

.render_dump(value) ⇒ Object

Render a value as a pre-formatted inspect() wrapped in <pre> tags.

Gated on TINA4_DEBUG=true. In production (TINA4_DEBUG unset or false) this returns an empty SafeString to avoid leaking internal state, object shapes, or sensitive values into rendered HTML.

Shared by the value|dump } filter and the dump(value) } global function so both produce identical output and obey the same gating.



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# File 'lib/tina4/frond.rb', line 2018

def self.render_dump(value)
  return SafeString.new("") unless ENV.fetch("TINA4_DEBUG", "").downcase == "true"

  dumped = value.inspect
  escaped = dumped
    .gsub("&", "&amp;")
    .gsub("<", "&lt;")
    .gsub(">", "&gt;")
    .gsub('"', "&quot;")
  SafeString.new("<pre>#{escaped}</pre>")
end

.set_form_token_session_id(session_id) ⇒ Object

Set the session ID used for CSRF form token binding. Parity with Python/PHP/Node: Frond.set_form_token_session_id(id)

Parameters:

  • session_id (String) —

    The session ID to bind form tokens to



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# File 'lib/tina4/frond.rb', line 2049

def set_form_token_session_id(session_id)
  self.form_token_session_id = session_id
end

Instance Method Details

#add_filter(name, &blk) ⇒ Object

Register a custom filter.



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# File 'lib/tina4/frond.rb', line 253

def add_filter(name, &blk)
  @filters[name.to_s] = blk
end

#add_global(name, value) ⇒ Object

Register a global variable available in all templates.



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# File 'lib/tina4/frond.rb', line 263

def add_global(name, value)
  @globals[name.to_s] = value
end

#add_test(name, &blk) ⇒ Object

Register a custom test.



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# File 'lib/tina4/frond.rb', line 258

def add_test(name, &blk)
  @tests[name.to_s] = blk
end

#clear_cache ⇒ Object

Clear all compiled template caches.



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# File 'lib/tina4/frond.rb', line 244

def clear_cache
  @compiled.clear
  @compiled_strings.clear
  @filter_chain_cache.clear
  @resolve_cache.clear
  @dotted_split_cache.clear
end

#render(template, data = {}) ⇒ Object

Render a template file with data. Uses token caching for performance.

Caching strategy:

* TINA4_DEBUG=true        — never cache (always re-read + re-tokenize).
* TINA4_TEMPLATE_CACHE_TTL > 0 — cache entries expire after N seconds.
* TINA4_TEMPLATE_CACHE_TTL == 0 (default in production) — permanent cache.



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# File 'lib/tina4/frond.rb', line 198

def render(template, data = {})
  context = @globals.merge(stringify_keys(data))

  path = File.join(@template_dir, template)
  raise "Template not found: #{path}" unless File.exist?(path)

  debug_mode = ENV.fetch("TINA4_DEBUG", "").downcase == "true"
  ttl = (ENV["TINA4_TEMPLATE_CACHE_TTL"] || "0").to_i

  unless debug_mode
    cached = @compiled[template]
    if cached
      # cached layout: [tokens, mtime, cached_at]
      tokens, _mtime, cached_at = cached
      fresh = ttl <= 0 || (Time.now.to_i - cached_at.to_i) < ttl
      return execute_cached(tokens, context) if fresh
    end
  end
  # Dev mode: skip cache entirely — always re-read and re-tokenize
  # so edits to partials and extended base templates are detected

  # Cache miss — load, tokenize, cache
  source = File.read(path, encoding: "utf-8")
  mtime = File.mtime(path)
  tokens = tokenize(source)
  @compiled[template] = [tokens, mtime, Time.now.to_i]
  execute_with_tokens(source, tokens, context)
end

#render_string(source, data = {}) ⇒ Object

Render a template string directly. Uses token caching for performance.



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# File 'lib/tina4/frond.rb', line 228

def render_string(source, data = {})
  context = @globals.merge(stringify_keys(data))

  key = Digest::MD5.hexdigest(source)
  cached_tokens = @compiled_strings[key]

  if cached_tokens
    return execute_cached(cached_tokens, context)
  end

  tokens = tokenize(source)
  @compiled_strings[key] = tokens
  execute_cached(tokens, context)
end

#sandbox(filters: nil, tags: nil, vars: nil) ⇒ Object

Enable sandbox mode.



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# File 'lib/tina4/frond.rb', line 268

def sandbox(filters: nil, tags: nil, vars: nil)
  @sandbox         = true
  @allowed_filters = filters ? filters.map(&:to_s) : nil
  @allowed_tags    = tags    ? tags.map(&:to_s)    : nil
  @allowed_vars    = vars    ? vars.map(&:to_s)    : nil
  self
end

#unsandbox ⇒ Object

Disable sandbox mode.



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# File 'lib/tina4/frond.rb', line 277

def unsandbox
  @sandbox         = false
  @allowed_filters = nil
  @allowed_tags    = nil
  @allowed_vars    = nil
  self
end