Class: Jsrb::JSStatementContext

Inherits:
Object
  • Object
show all
Defined in:
lib/jsrb/js_statement_context.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ JSStatementContext

Returns a new instance of JSStatementContext.



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# File 'lib/jsrb/js_statement_context.rb', line 7

def initialize
  @var_count = 0
  @stacks = [[]]
end

Instance Attribute Details

#stacks ⇒ Object (readonly)

Returns the value of attribute stacks.



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# File 'lib/jsrb/js_statement_context.rb', line 5

def stacks
  @stacks
end

Instance Method Details

#gen_var_name! ⇒ Object 



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# File 'lib/jsrb/js_statement_context.rb', line 12

def gen_var_name!
  @var_count += 1
  "_v#{@var_count}"
end

#new_block ⇒ Object 



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# File 'lib/jsrb/js_statement_context.rb', line 26

def new_block
  _result, statements = in_new_context { yield }
  {
    type: 'BlockStatement',
    body: statements
  }
end

#new_expression(object = nil) ⇒ Object 



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# File 'lib/jsrb/js_statement_context.rb', line 22

def new_expression(object = nil)
  ExprChain.new(self, object)
end

#push(*stmt) ⇒ Object 



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# File 'lib/jsrb/js_statement_context.rb', line 17

def push(*stmt)
  @stacks.last.push(*stmt)
  nil
end

#ruby_to_js_ast(rbv) ⇒ Object

rubocop:disable Metrics/MethodLength rubocop:disable Metrics/CyclomaticComplexity rubocop:disable Metrics/AbcSize



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# File 'lib/jsrb/js_statement_context.rb', line 37

def ruby_to_js_ast(rbv)
  case rbv
  when ExprChain
    rbv.unwrap!
  when Proc
    chainables = rbv.parameters.map do |_type, name|
      new_expression.member!(name.to_s)
    end
    result, statements = in_new_context { rbv.call(*chainables) }
    if result
      statements.push(
        type: 'ReturnStatement',
        argument: ruby_to_js_ast(result)
      )
    end
    {
      type: 'FunctionExpression',
      id: nil,
      params: chainables.map { |arg| ruby_to_js_ast(arg) },
      body: {
        type: 'BlockStatement',
        body: statements
      }
    }
  when Hash
    var_name = gen_var_name!
    statements = rbv.map do |key, v|
      {
        type: 'ExpressionStatement',
        expression: new_expression.member!(var_name).member!(key).assign!(v).unwrap!
      }
    end
    {
      type: 'CallExpression',
      callee: {
        type: 'FunctionExpression',
        id: nil,
        params: [new_expression.member!(var_name).unwrap!],
        body: {
          type: 'BlockStatement',
          body: statements.concat(
            [
              {
                type: 'ReturnStatement',
                argument: new_expression.member!(var_name).unwrap!
              }
            ]
          )
        }
      },
      arguments: [
        {
          type: 'ObjectExpression',
          properties: []
        }
      ]
    }
  when Array
    {
      type: 'ArrayExpression',
      elements: rbv.map { |v| ruby_to_js_ast(v) }
    }
  when TrueClass, FalseClass, String, NilClass
    build_literal_ast(rbv)
  when Float::INFINITY
    new_expression.member!('Number').member!('POSITIVE_INFINITY').unwrap!
  when -Float::INFINITY
    new_expression.member!('Number').member!('NEGATIVE_INFINITY').unwrap!
  when Float
    if rbv.nan?
      new_expression.member!('Number').member!('NaN').unwrap!
    else
      build_finite_number_ast(rbv)
    end
  when Integer
    build_finite_number_ast(rbv)
  when Symbol
    ruby_to_js_ast(rbv.to_s)
  else
    raise "Can't convert to JavaScript AST from: #{rbv.inspect}"
  end
end