Class: Rubyang::Xpath::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/rubyang/xpath/parser.rb,
lib/rubyang/xpath/parser/parser.tab.rb

Constant Summary collapse

Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
"$end",
"error",
"\"/\"",
"\"::\"",
"\"ancestor\"",
"\"ancestor-or-self\"",
"\"attribute\"",
"\"child\"",
"\"descendant\"",
"\"descendant-or-self\"",
"\"following\"",
"\"following-sibling\"",
"\"namespace\"",
"\"parent\"",
"\"preceding\"",
"\"preceding-sibling\"",
"\"self\"",
"\"(\"",
"\")\"",
"\"processing-instruction\"",
"\"Literal\"",
"\"[\"",
"\"]\"",
"\"//\"",
"\".\"",
"\"..\"",
"\"@\"",
"\",\"",
"\"Exp\"",
"\"|\"",
"\"FilterExpr Predicat\"",
"\"or\"",
"\"and\"",
"\"=\"",
"\"!=\"",
"\"<\"",
"\">\"",
"\"<=\"",
"\">=\"",
"\"+\"",
"\"-\"",
"\"*\"",
"\"div\"",
"\"mod\"",
"\"UnaryExp\"",
"\"Digits\"",
"\"last(\"",
"\"position(\"",
"\"count(\"",
"\"id(\"",
"\"local-name(\"",
"\"namespace-uri(\"",
"\"name(\"",
"\"string(\"",
"\"concat(\"",
"\"starts-with(\"",
"\"contains(\"",
"\"substring-before(\"",
"\"substring-after(\"",
"\"substring(\"",
"\"string-length(\"",
"\"normalize-space(\"",
"\"translate(\"",
"\"boolean(\"",
"\"not(\"",
"\"true(\"",
"\"false(\"",
"\"lang(\"",
"\"number(\"",
"\"sum(\"",
"\"floor(\"",
"\"ceiling(\"",
"\"round(\"",
"\"current(\"",
"\"$\"",
"\"NCName\"",
"\":\"",
"\"comment\"",
"\"text\"",
"\"node\"",
"$start",
"statement",
"\"Expr\"",
"\"LocationPath\"",
"\"RelativeLocationPath\"",
"\"AbsoluteLocationPath\"",
"\"AbbreviatedAbsoluteLocationPath\"",
"\"Step\"",
"\"AbbreviatedRelativeLocationPath\"",
"\"AxisSpecifier\"",
"\"NodeTest\"",
"\"Predicates\"",
"\"AbbreviatedStep\"",
"\"AxisName\"",
"\"AbbreviatedAxisSpecifier\"",
"\"Predicate\"",
"\"NameTest\"",
"\"NodeType\"",
"\"PredicateExpr\"",
"\"OrExpr\"",
"\"PrimaryExpr\"",
"\"VariableReference\"",
"\"Number\"",
"\"FunctionCall\"",
"\"FunctionName(\"",
"\"Arguments\"",
"\"Argument\"",
"\"UnionExpr\"",
"\"PathExpr\"",
"\"FilterExpr\"",
"\"AndExpr\"",
"\"EqualityExpr\"",
"\"RelationalExpr\"",
"\"AdditiveExpr\"",
"\"MultiplicativeExpr\"",
"\"UnaryExpr\"",
"\"QName\"",
"\"PrefixedName\"",
"\"UnprefixedName\"",
"\"Prefix\"",
"\"LocalPart\"" ]
Racc_debug_parser = 
false

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/rubyang/xpath/parser.rb', line 16

def initialize
  @logger = Logger.new(self.class.name)
end

Class Method Details

.parse(xpath_str) ⇒ Object 



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# File 'lib/rubyang/xpath/parser.rb', line 11

def self.parse( xpath_str )
  parser = self.new
  parser.parse( xpath_str )
end

Instance Method Details

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/rubyang/xpath/parser/parser.tab.rb', line 2037

def _reduce_none(val, _values, result)
  val[0]
end

#next_token ⇒ Object 



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# File 'lib/rubyang/xpath/parser.rb', line 124

def next_token
  @logger.debug { @tokens.first }
  @tokens.shift
end

#parse(xpath_str) ⇒ Object 



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# File 'lib/rubyang/xpath/parser.rb', line 20

def parse( xpath_str )
  @tokens = Array.new

  s = StringScanner.new( xpath_str )

  scanre_list = [
    ["(",                      /^\(/],
    [")",                      /^\)/],
    ["[",                      /^\[/],
    ["]",                      /^\]/],
    ["..",                     /^\.\./],
    [".",                      /^\./],
    ["@",                      /^\@/],
    [",",                      /^\,/],
    ["::",                     /^\:\:/],
    ["Literal",                /^(?:"[^"]*"|'[^']*')/],
    ["Digits",                 /^[0-9]+/],
    ["//",                     /^\/\//],
    ["/",                      /^\//],
    ["|",                      /^\|/],
    ["+",                      /^\+/],
    ["-",                      /^\-/],
    ["!=",                     /^\!\=/],
    ["<=",                     /^\<\=/],
    [">=",                     /^\>\=/],
    ["=",                      /^\=/],
    ["<",                      /^\</],
    [">",                      /^\>/],
    ["and",                    /^and/],
    ["or",                     /^or/],
    ["mod",                    /^mod/],
    ["div",                    /^div/],
    ["$",                      /^\$/],
    ["*",                      /^\*/],
    [":",                      /^\:/],
    ["S",                      /^[ \t]+/],
    # NodeType
    ["comment",                /^comment/],
    ["text",                   /^text/],
    ["node",                   /^node/],
    # ProcessingInstruction
    ["processing-instruction", /^processing-instruction/],
    # Axis
    ["ancestor",               /^ancestor/],
    ["ancestor-or-self",       /^ancestor-or-self/],
    ["attribute",              /^attribute/],
    ["child",                  /^child/],
    ["descendant",             /^descendant/],
    ["descendant-or-self",     /^descendant-or-self/],
    ["following",              /^following/],
    ["following-sibling",      /^following-sibling/],
    ["namespace",              /^namespace/],
    ["parent",                 /^parent/],
    ["preceding",              /^preceding/],
    ["preceding-sibling",      /^preceding-sibling/],
    ["self",                   /^self/],
    # FunctionName
    ["last(",                  /^last[ \t]*\(/],
    ["position(",              /^position[ \t]*\(/],
    ["count(",                 /^count[ \t]*\(/],
    ["id(",                    /^id[ \t]*\(/],
    ["local-name(",            /^local-name[ \t]*\(/],
    ["namespace-uri(",         /^namespace-uri[ \t]*\(/],
    ["name(",                  /^name[ \t]*\(/],
    ["string(",                /^string[ \t]*\(/],
    ["concat(",                /^concat[ \t]*\(/],
    ["starts-with(",           /^starts-with[ \t]*\(/],
    ["contains(",              /^contains[ \t]*\(/],
    ["substring-before(",      /^substring-before[ \t]*\(/],
    ["substring-after(",       /^substring-after[ \t]*\(/],
    ["substring(",             /^substring[ \t]*\(/],
    ["string-length(",         /^string-length[ \t]*\(/],
    ["normalize-space(",       /^normalize-space[ \t]*\(/],
    ["translate(",             /^translate[ \t]*\(/],
    ["boolean(",               /^boolean[ \t]*\(/],
    ["not(",                   /^not[ \t]*\(/],
    ["true(",                  /^true[ \t]*\(/],
    ["false(",                 /^false[ \t]*\(/],
    ["lang(",                  /^lang[ \t]*\(/],
    ["number(",                /^number[ \t]*\(/],
    ["sum(",                   /^sum[ \t]*\(/],
    ["floor(",                 /^floor[ \t]*\(/],
    ["ceiling(",               /^ceiling[ \t]*\(/],
    ["round(",                 /^round[ \t]*\(/],
    ["current(",               /^current[ \t]*\(/],
    # NCName
    ["NCName",                 /^(?:[A-Z]|\_|[a-z])(?:[A-Z]|\_|[a-z]|\-|\.|[0-9])*/],
  ]

  scanre = Regexp.union( scanre_list.map{ |scanre| scanre[1] } )

  until s.eos?
    token = s.scan( scanre )
    @logger.debug { token }
    next if "S" == scanre_list.find{ |s| s[1] =~ token }[0]
    @tokens.push [scanre_list.find{ |s| s[1] =~ token }[0], token]
    @logger.debug { @tokens.last }
  end

  @logger.debug { 'run do_parse' }
  result = self.do_parse
  result
end