Class: RParsec::ParseContext

Inherits:
Object
  • Object
show all
Defined in:
lib/rparsec/context.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(src, index = 0, error = nil) ⇒ ParseContext

Returns a new instance of ParseContext.



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# File 'lib/rparsec/context.rb', line 11

def initialize(src, index=0, error=nil)
  @src = src
  @index = index
  @error = error
  @scanner = nil
end

Instance Attribute Details

#error ⇒ Object

Returns the value of attribute error.



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# File 'lib/rparsec/context.rb', line 9

def error
  @error
end

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/rparsec/context.rb', line 9

def index
  @index
end

#result ⇒ Object

Returns the value of attribute result.



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# File 'lib/rparsec/context.rb', line 9

def result
  @result
end

#src ⇒ Object (readonly)

Returns the value of attribute src.



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# File 'lib/rparsec/context.rb', line 8

def src
  @src
end

Instance Method Details

#advance(n) ⇒ Object 



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# File 'lib/rparsec/context.rb', line 65

def advance n
  @index += n
end

#available ⇒ Object 



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# File 'lib/rparsec/context.rb', line 53

def available
  @src.length - @index
end

#current ⇒ Object 



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# File 'lib/rparsec/context.rb', line 45

def current
  @src[@index]
end

#eof ⇒ Object 



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# File 'lib/rparsec/context.rb', line 49

def eof
  @index >= @src.length
end

#error_input ⇒ Object 



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# File 'lib/rparsec/context.rb', line 34

def error_input
  return nil if @error.nil?
  err = @error
  err = err.last if err.kind_of? Array
  err.input
end

#expecting(expected = nil) ⇒ Object 



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# File 'lib/rparsec/context.rb', line 79

def expecting(expected=nil)
  @error = Expected.new(@index, get_current_input, expected)
  return false
end

#failure(msg = nil) ⇒ Object 



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# File 'lib/rparsec/context.rb', line 74

def failure(msg=nil)
  @error = Failure.new(@index, get_current_input, msg)
  return false
end

#get_current_input ⇒ Object 



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# File 'lib/rparsec/context.rb', line 84

def get_current_input
  return nil if eof
  current
end

#next ⇒ Object 



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# File 'lib/rparsec/context.rb', line 61

def next
  @index += 1
end

#peek(i) ⇒ Object 



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# File 'lib/rparsec/context.rb', line 57

def peek i
  @src[@index + i]
end

#prepare_error ⇒ Object 



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# File 'lib/rparsec/context.rb', line 24

def prepare_error
  @error.flatten! if @error.kind_of?(Array)
end

#reset_error ⇒ Object 



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# File 'lib/rparsec/context.rb', line 41

def reset_error
  @error = nil
end

#retn(val) ⇒ Object 



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# File 'lib/rparsec/context.rb', line 69

def retn(val)
  @result = val
  true
end

#scanner ⇒ Object 



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# File 'lib/rparsec/context.rb', line 18

def scanner
  @scanner = StringScanner.new(src) if @scanner.nil?
  @scanner.pos = @index
  @scanner
end

#to_msg ⇒ Object 



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# File 'lib/rparsec/context.rb', line 28

def to_msg
  return '' if @error.nil?
  return @error.msg unless @error.kind_of?(Array)
  @error.map { |e| e.msg }.join(' or ')
end