Class: Strling::IR::Compiler

Inherits:
Object
  • Object
show all
Defined in:
lib/strling/ir.rb

Overview

Add others as needed

Class Method Summary collapse

Class Method Details

.compile(ast_node) ⇒ Object 



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# File 'lib/strling/ir.rb', line 23

def self.compile(ast_node)
  return nil if ast_node.nil?

  case ast_node
  # Core Nodes
  when Strling::Core::Lit
    Lit.new(ir: 'Lit', value: ast_node.value)
  when Strling::Core::Quant
    Quant.new(
      ir: 'Quant',
      child: compile(ast_node.child),
      min: ast_node.min,
      max: ast_node.max,
      mode: ast_node.mode
    )
  when Strling::Core::Group
    Group.new(
      ir: 'Group',
      capturing: ast_node.capturing,
      body: compile(ast_node.body),
      name: ast_node.name,
      atomic: ast_node.atomic
    )
  when Strling::Core::Alt
    Alt.new(
      ir: 'Alt',
      branches: ast_node.branches.map { |b| compile(b) }
    )
  when Strling::Core::Seq
    parts = ast_node.parts.map { |p| compile(p) }
    merged_parts = []
    parts.each do |part|
      if part.is_a?(Lit) && merged_parts.last.is_a?(Lit)
        last = merged_parts.pop
        merged_parts << Lit.new(ir: 'Lit', value: last.value + part.value)
      else
        merged_parts << part
      end
    end
    if merged_parts.size == 1
      merged_parts.first
    else
      Seq.new(ir: 'Seq', parts: merged_parts)
    end
  when Strling::Core::Esc
    Esc.new(ir: 'Esc', type: ast_node.type, property: ast_node.property)
  when Strling::Core::Anchor
    at = ast_node.at == 'NonWordBoundary' ? 'NotWordBoundary' : ast_node.at
    Anchor.new(ir: 'Anchor', at: at)
  when Strling::Core::Look
    Look.new(
      ir: 'Look',
      dir: ast_node.dir,
      neg: ast_node.neg,
      body: compile(ast_node.body)
    )
  # Legacy Nodes
  when Strling::Nodes::Literal
    Lit.new(ir: 'Lit', value: ast_node.value)
  when Strling::Nodes::Quantifier
    mode = if ast_node.possessive
             'Possessive'
           elsif ast_node.lazy
             'Lazy'
           else
             'Greedy'
           end
    
    # Handle max being null/nil -> "Inf"
    max_val = ast_node.max.nil? ? 'Inf' : ast_node.max

    Quant.new(
      ir: 'Quant',
      child: compile(ast_node.target),
      min: ast_node.min,
      max: max_val,
      mode: mode
    )
  when Strling::Nodes::CharacterClass
    items = ast_node.members.map do |member|
      if member.is_a?(Strling::Nodes::Literal)
        Char.new(ir: 'Char', char: member.value)
      elsif member.is_a?(Strling::Nodes::UnicodeProperty)
         type = member.negated ? 'P' : 'p'
         Esc.new(ir: 'Esc', type: type, property: member.value)
      elsif member.is_a?(Strling::Nodes::Escape)
         compile(member)
      else
        # Fallback or recursive compile if members can be other things
        compile(member)
      end
    end
    CharClass.new(ir: 'CharClass', negated: ast_node.negated, items: items)
  when Strling::Nodes::Group
    Group.new(
      ir: 'Group',
      capturing: ast_node.capturing,
      body: compile(ast_node.body),
      name: ast_node.name,
      atomic: ast_node.atomic ? true : nil
    )
  when Strling::Nodes::Alternation
    Alt.new(
      ir: 'Alt',
      branches: ast_node.alternatives.map { |a| compile(a) }
    )
  when Strling::Nodes::UnicodeProperty
    # If it appears standalone (not in CharClass), it might still be Esc?
    # In unicode_property_short.json it was inside CharacterClass.
    # Let's assume it maps to Esc.
    type = ast_node.negated ? 'P' : 'p'
    Esc.new(ir: 'Esc', type: type, property: ast_node.value)
  when Strling::Nodes::Sequence
    parts = ast_node.parts.map { |p| compile(p) }
    
    # Merge adjacent Lit nodes
    merged_parts = []
    parts.each do |part|
      if part.is_a?(Lit) && merged_parts.last.is_a?(Lit)
        last = merged_parts.pop
        merged_parts << Lit.new(ir: 'Lit', value: last.value + part.value)
      else
        merged_parts << part
      end
    end

    if merged_parts.size == 1
      merged_parts.first
    else
      Seq.new(ir: 'Seq', parts: merged_parts)
    end
  when Strling::Nodes::Lookahead
    Look.new(
      ir: 'Look',
      dir: 'Ahead',
      neg: ast_node.negative || false, # AST might not have negative if it's a separate node type "NegativeLookahead"
      body: compile(ast_node.body)
    )
  when Strling::Nodes::Lookbehind
    Look.new(
      ir: 'Look',
      dir: 'Behind',
      neg: ast_node.negative || false,
      body: compile(ast_node.body)
    )
  when Strling::Nodes::Anchor
    at = ast_node.at == 'NonWordBoundary' ? 'NotWordBoundary' : ast_node.at
    Anchor.new(ir: 'Anchor', at: at)
  when Strling::Nodes::Escape
    type = case ast_node.kind
           when 'digit' then 'd'
           when 'not-digit' then 'D'
           when 'space' then 's'
           when 'not-space' then 'S'
           when 'word' then 'w'
           when 'not-word' then 'W'
           # Add others if needed
           else ast_node.kind # Fallback
           end
    Esc.new(ir: 'Esc', type: type, property: nil)
  when Strling::Nodes::BackReference
    BackRef.new(
      ir: 'Backref',
      byIndex: ast_node.index,
      byName: ast_node.name
    )
  when Strling::Nodes::Range
    Range.new(ir: 'Range', from: ast_node.from, to: ast_node.to)
  when Strling::Nodes::Dot
    Dot.new(ir: 'Dot')
  else
    # Fallback
    # puts "Warning: Unknown AST node for compilation: #{ast_node.class}"
    nil
  end
end