Class: Opal::Nodes::RegexpNode

Inherits:
Base
  • Object
show all
Defined in:
opal/lib/opal/nodes/literal.rb

Constant Summary collapse

SUPPORTED_FLAGS =
/[gimuy]/.freeze

Instance Attribute Summary collapse

Attributes inherited from Base

#compiler, #type

Instance Method Summary collapse

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, #children, children, #class_variable_owner, #class_variable_owner_nesting_level, #comments, #compile_to_fragments, #error, #expr, #expr?, #expr_or_nil, #fragment, handle, handlers, #has_rescue_else?, #helper, #in_ensure, #in_ensure?, #in_while?, #process, #push, #recv, #recv?, #s, #scope, #stmt, #stmt?, truthy_optimize?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

#conditional_send, #current_indent, #empty_line, #indent, #js_falsy, #js_truthy, #js_truthy_optimize, #line, #mid_to_jsid, #property, #valid_name?

Constructor Details

#initializeRegexpNode

Returns a new instance of RegexpNode.


117
118
119
120
# File 'opal/lib/opal/nodes/literal.rb', line 117

def initialize(*)
  super
  extract_flags_and_value
end

Instance Attribute Details

#flagsObject

Returns the value of attribute flags.


112
113
114
# File 'opal/lib/opal/nodes/literal.rb', line 112

def flags
  @flags
end

#valueObject

Returns the value of attribute value.


112
113
114
# File 'opal/lib/opal/nodes/literal.rb', line 112

def value
  @value
end

Instance Method Details

#compileObject


122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
# File 'opal/lib/opal/nodes/literal.rb', line 122

def compile
  flags.select! do |flag|
    if SUPPORTED_FLAGS =~ flag
      true
    else
      compiler.warning "Skipping the '#{flag}' Regexp flag as it's not widely supported by JavaScript vendors."
      false
    end
  end

  if value.type == :str
    compile_static_regexp
  else
    compile_dynamic_regexp
  end
end

#compile_dynamic_regexpObject


139
140
141
142
143
144
145
146
147
148
# File 'opal/lib/opal/nodes/literal.rb', line 139

def compile_dynamic_regexp
  push 'Opal.regexp(['
  value.children.each_with_index do |v, index|
    push ', ' unless index.zero?
    push expr(v)
  end
  push ']'
  push ", '#{flags.join}'" if flags.any?
  push ")"
end

#compile_static_regexpObject


150
151
152
153
154
155
156
157
158
159
160
161
# File 'opal/lib/opal/nodes/literal.rb', line 150

def compile_static_regexp
  value = self.value.children[0]
  case value
  when ''
    push('/(?:)/')
  when %r{\?<\w+\>}
    message = "named captures are not supported in javascript: #{value.inspect}"
    push "self.$raise(new SyntaxError('#{message}'))"
  else
    push "#{Regexp.new(value).inspect}#{flags.join}"
  end
end

#extract_flags_and_valueObject


163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
# File 'opal/lib/opal/nodes/literal.rb', line 163

def extract_flags_and_value
  *values, flags_sexp = *children
  self.flags = flags_sexp.children.map(&:to_s)

  self.value = case values.length
               when 0
                 # empty regexp, we can process it inline
                 s(:str, '')
               when 1
                 # simple plain regexp, we can put it inline
                 values[0]
               else
                 s(:dstr, *values)
               end

  # trimming when //x provided
  # required by parser gem, but JS doesn't support 'x' flag
  if flags.include?('x')
    parts = value.children.map do |part|
      if part.is_a?(::Opal::AST::Node) && part.type == :str
        trimmed_value = part.children[0].gsub(/\A\s*\#.*/, '').gsub(/\s/, '')
        s(:str, trimmed_value)
      else
        part
      end
    end

    self.value = value.updated(nil, parts)
    flags.delete('x')
  end

  if value.type == :str
    # Replacing \A -> ^, \z -> $, required for the parser gem
    self.value = s(:str, value.children[0].gsub('\A', '^').gsub('\z', '$'))
  end
end

#raw_valueObject


200
201
202
# File 'opal/lib/opal/nodes/literal.rb', line 200

def raw_value
  self.value = @sexp.loc.expression.source
end