Class: CodeRay::Scanners::SQL

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

Overview

by Josh Goebel

Constant Summary collapse

RESERVED_WORDS = 
%w(
  create table index trigger drop primary key set select
  insert update delete replace into
  on from values before and or if exists case when
  then else as group order by avg where
  join inner outer union engine not
  like end using collate show columns begin
)
PREDEFINED_TYPES = 
%w(
  char varchar enum binary text tinytext mediumtext
  longtext blob tinyblob mediumblob longblob timestamp
  date time datetime year double decimal float int
  integer tinyint mediumint bigint smallint unsigned bit
  bool boolean hex bin oct
)
PREDEFINED_FUNCTIONS = 
%w( sum cast abs pi count min max avg )
DIRECTIVES = 
%w( auto_increment unique default charset )
PREDEFINED_CONSTANTS = 
%w( null true false )
IDENT_KIND = 
CaseIgnoringWordList.new(:ident).
add(RESERVED_WORDS, :reserved).
add(PREDEFINED_TYPES, :pre_type).
add(PREDEFINED_CONSTANTS, :pre_constant).
add(PREDEFINED_FUNCTIONS, :predefined).
add(DIRECTIVES, :directive)
ESCAPE = 
/ [rbfnrtv\n\\\/'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} | . /mx
UNICODE_ESCAPE = 
/ u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x
STRING_PREFIXES = 
/[xnb]|_\w+/i

Constants inherited from Scanner

CodeRay::Scanners::Scanner::DEFAULT_OPTIONS, CodeRay::Scanners::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/sql.rb', line 43

def scan_tokens tokens, options
  
  state = :initial
  string_type = nil
  string_content = ''
  
  until eos?
    
    kind = nil
    match = nil
    
    if state == :initial
      
      if scan(/ \s+ | \\\n /x)
        kind = :space
      
      elsif scan(/^(?:--\s?|#).*/)
        kind = :comment
        
      elsif scan(%r! /\* (?: .*? \*/ | .* ) !mx)
        kind = :comment
        
      elsif scan(/ [-+*\/=<>;,!&^|()\[\]{}~%] | \.(?!\d) /x)
        kind = :operator
        
      elsif scan(/(#{STRING_PREFIXES})?([`"'])/o)
        prefix = self[1]
        string_type = self[2]
        tokens << [:open, :string]
        tokens << [prefix, :modifier] if prefix
        match = string_type
        state = :string
        kind = :delimiter
        
      elsif match = scan(/ @? [A-Za-z_][A-Za-z_0-9]* /x)
        kind = match[0] == ?@ ? :variable : IDENT_KIND[match.downcase]
        
      elsif scan(/0[xX][0-9A-Fa-f]+/)
        kind = :hex
        
      elsif scan(/0[0-7]+(?![89.eEfF])/)
        kind = :oct
        
      elsif scan(/(?>\d+)(?![.eEfF])/)
        kind = :integer
        
      elsif scan(/\d[fF]|\d*\.\d+(?:[eE][+-]?\d+)?|\d+[eE][+-]?\d+/)
        kind = :float
        
      else
        getch
        kind = :error
        
      end
      
    elsif state == :string
      if match = scan(/[^\\"'`]+/)
        string_content << match
        next
      elsif match = scan(/["'`]/)
        if string_type == match
          if peek(1) == string_type  # doubling means escape
            string_content << string_type << getch
            next
          end
          unless string_content.empty?
            tokens << [string_content, :content]
            string_content = ''
          end
          tokens << [matched, :delimiter]
          tokens << [:close, :string]
          state = :initial
          string_type = nil
          next
        else
          string_content << match
        end
        next
      elsif scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
        unless string_content.empty?
          tokens << [string_content, :content]
          string_content = ''
        end
        kind = :char
      elsif match = scan(/ \\ . /mox)
        string_content << match
        next
      elsif scan(/ \\ | $ /x)
        unless string_content.empty?
          tokens << [string_content, :content]
          string_content = ''
        end
        kind = :error
        state = :initial
      else
        raise "else case \" reached; %p not handled." % peek(1), tokens
      end
      
    else
      raise 'else-case reached', tokens
      
    end
    
    match ||= matched
    unless kind
      raise_inspect 'Error token %p in line %d' %
        [[match, kind], line], tokens, state
    end
    raise_inspect 'Empty token', tokens unless match
    
    tokens << [match, kind]
    
  end
  tokens
  
end