Class: CodeRay::Scanners::YAML

Inherits:
Scanner
  • Object
show all
Defined in:
lib/coderay/scanners/yaml.rb

Overview

YAML Scanner

Based on the YAML scanner from Syntax by Jamis Buck.

Constant Summary

Constants inherited from Scanner

Scanner::DEFAULT_OPTIONS, Scanner::ScanError

Instance Method Summary collapse

Methods inherited from Scanner

#column, #each, file_extension, #initialize, #line, normify, #reset, streamable?, #streaming?, #string=, #tokenize, #tokens

Methods included from Plugin

#helper, #included, #plugin_host, #plugin_id, #register_for, #title

Constructor Details

This class inherits a constructor from CodeRay::Scanners::Scanner

Instance Method Details

#scan_tokens(tokens, options) ⇒ Object 



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# File 'lib/coderay/scanners/yaml.rb', line 12

def scan_tokens tokens, options
  
  value_expected = nil
  state = :initial
  key_indent = indent = 0
  
  until eos?
    
    kind = nil
    match = nil
    
    if bol?
      key_indent = nil
      if $DEBUG
        indent = check(/ +/) ? matched.size : 0
        tokens << [indent.to_s, :debug]
      end
    end
    
    if match = scan(/ +[\t ]*/)
      kind = :space
      
    elsif match = scan(/\n+/)
      kind = :space
      state = :initial if match.index(?\n)
      
    elsif match = scan(/#.*/)
      kind = :comment
      
    elsif bol? and case
      when match = scan(/---|\.\.\./)
        tokens << [:open, :head]
        tokens << [match, :head]
        tokens << [:close, :head]
        next
      when match = scan(/%.*/)
        tokens << [match, :doctype]
        next
      end
    
    elsif state == :value and case
      when !check(/(?:"[^"]*")(?=: |:$)/) && scan(/"/)
        tokens << [:open, :string]
        tokens << [matched, :delimiter]
        tokens << [matched, :content] if scan(/ [^"\\]* (?: \\. [^"\\]* )* /mx)
        tokens << [matched, :delimiter] if scan(/"/)
        tokens << [:close, :string]
        next
      when match = scan(/[|>][-+]?/)
        tokens << [:open, :string]
        tokens << [match, :delimiter]
        string_indent = key_indent || column(pos - match.size - 1)
        tokens << [matched, :content] if scan(/(?:\n+ {#{string_indent + 1}}.*)+/)
        tokens << [:close, :string]
        next
      when match = scan(/(?![!"*&]).+?(?=$|\s+#)/)
        tokens << [match, :string]
        string_indent = key_indent || column(pos - match.size - 1)
        tokens << [matched, :string] if scan(/(?:\n+ {#{string_indent + 1}}.*)+/)
        next
      end
      
    elsif case
      when match = scan(/[-:](?= |$)/)
        state = :value if state == :colon && (match == ':' || match == '-')
        state = :value if state == :initial && match == '-'
        kind = :operator
      when match = scan(/[,{}\[\]]/)
        kind = :operator
      when state == :initial && match = scan(/[\w.() ]*\S(?=: |:$)/)
        kind = :key
        key_indent = column(pos - match.size - 1)
        # tokens << [key_indent.inspect, :debug]
        state = :colon
      when match = scan(/(?:"[^"\n]*"|'[^'\n]*')(?=: |:$)/)
        tokens << [:open, :key]
        tokens << [match[0,1], :delimiter]
        tokens << [match[1..-2], :content]
        tokens << [match[-1,1], :delimiter]
        tokens << [:close, :key]
        key_indent = column(pos - match.size - 1)
        # tokens << [key_indent.inspect, :debug]
        state = :colon
        next
      when scan(/(![\w\/]+)(:([\w:]+))?/)
        tokens << [self[1], :type]
        if self[2]
          tokens << [':', :operator]
          tokens << [self[3], :class]
        end
        next
      when scan(/&\S+/)
        kind = :variable
      when scan(/\*\w+/)
        kind = :global_variable
      when scan(/<</)
        kind = :class_variable
      when scan(/\d\d:\d\d:\d\d/)
        kind = :oct
      when scan(/\d\d\d\d-\d\d-\d\d\s\d\d:\d\d:\d\d(\.\d+)? [-+]\d\d:\d\d/)
        kind = :oct
      when scan(/:\w+/)
        kind = :symbol
      when scan(/[^:\s]+(:(?! |$)[^:\s]*)* .*/)
        kind = :error
      when scan(/[^:\s]+(:(?! |$)[^:\s]*)*/)
        kind = :error
      end
      
    else
      getch
      kind = :error
      
    end
    
    match ||= matched
    
    raise_inspect 'Error token %p in line %d' % [[match, kind], line], tokens if $DEBUG && !kind
    raise_inspect 'Empty token', tokens unless match
    
    tokens << [match, kind]
    
  end
  
  tokens
end