Module: Howzit::ConditionalContent

Defined in:
lib/howzit/conditional_content.rb

Overview

Conditional Content processor Handles @if/@unless/@end blocks in topic content

Class Method Summary collapse

Class Method Details

.process(content, context = {}) ⇒ String

Process conditional blocks in content

Parameters:

  • content (String) —

    The content to process

  • context (Hash) (defaults to: {}) —

    Context for condition evaluation

Returns:

  • (String) —

    Content with conditional blocks processed



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# File 'lib/howzit/conditional_content.rb', line 16

def process(content, context = {})
  lines = content.split(/\n/)
  output = []
  condition_stack = []
  # Track if any condition in the current chain has been true
  # This is used for @elsif and @else to know if a previous branch matched
  chain_matched_stack = []

  lines.each do |line|
    # Check for @if or @unless
    if line =~ /^@(if|unless)\s+(.+)$/i
      directive = Regexp.last_match(1).downcase
      condition = Regexp.last_match(2).strip

      # Evaluate condition
      result = ConditionEvaluator.evaluate(condition, context)
      # For @unless, negate the result
      result = !result if directive == 'unless'

      condition_stack << result
      chain_matched_stack << result

      # Don't include the @if/@unless line itself
      next
    end

    # Check for @elsif
    if line =~ /^@elsif\s+(.+)$/i
      condition = Regexp.last_match(1).strip

      # If previous condition in chain was true, this branch is false
      # Otherwise, evaluate the condition
      if !condition_stack.empty? && chain_matched_stack.last
        # Previous branch matched, so this one is false
        condition_stack[-1] = false
      else
        # Previous branch didn't match, evaluate this condition
        result = ConditionEvaluator.evaluate(condition, context)
        condition_stack[-1] = result
        chain_matched_stack[-1] = result if result
      end

      # Don't include the @elsif line itself
      next
    end

    # Check for @else
    if line =~ /^@else\s*$/i
      # If any previous condition in chain was true, this branch is false
      # Otherwise, this branch is true
      if !condition_stack.empty? && chain_matched_stack.last
        # Previous branch matched, so else is false
        condition_stack[-1] = false
      else
        # No previous branch matched, so else is true
        condition_stack[-1] = true
        chain_matched_stack[-1] = true
      end

      # Don't include the @else line itself
      next
    end

    # Check for @end - only skip if it's closing an @if/@unless/@elsif/@else block
    if (line =~ /^@end\s*$/) && !condition_stack.empty?
      # This @end closes a conditional block, so skip it
      condition_stack.pop
      chain_matched_stack.pop
      next
    end
    # Otherwise, this @end is for @before/@after, so include it

    # Include the line only if all conditions in stack are true
    output << line if condition_stack.all? { |cond| cond }
  end

  output.join("\n")
end