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reader.rb
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reader.rb
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require 'rdf/turtle'
module RDF::TriG
##
# A parser for the TriG
#
# Leverages the Turtle reader
class Reader < RDF::Turtle::Reader
format Format
# Terminals passed to lexer. Order matters!
terminal(:ANON, ANON)
terminal(:BLANK_NODE_LABEL, BLANK_NODE_LABEL)
terminal(:IRIREF, IRIREF, unescape: true)
terminal(:DOUBLE, DOUBLE)
terminal(:DECIMAL, DECIMAL)
terminal(:INTEGER, INTEGER)
terminal(:PNAME_LN, PNAME_LN, unescape: true)
terminal(:PNAME_NS, PNAME_NS)
terminal(:STRING_LITERAL_LONG_SINGLE_QUOTE, STRING_LITERAL_LONG_SINGLE_QUOTE, unescape: true, partial_regexp: /^'''/)
terminal(:STRING_LITERAL_LONG_QUOTE, STRING_LITERAL_LONG_QUOTE, unescape: true, partial_regexp: /^"""/)
terminal(:STRING_LITERAL_QUOTE, STRING_LITERAL_QUOTE, unescape: true)
terminal(:STRING_LITERAL_SINGLE_QUOTE, STRING_LITERAL_SINGLE_QUOTE, unescape: true)
# String terminals
terminal(nil, %r(
[\(\),.;\[\]Aa]
| \^\^
| \{\|
| \|\}
| [\{\}]
| true|false
| <<|>>
)x)
terminal(:GRAPH, /graph/i)
terminal(:PREFIX, PREFIX)
terminal(:BASE, BASE)
terminal(:LANG_DIR, LANG_DIR)
##
# Iterates the given block for each RDF statement in the input.
#
# @yield [statement]
# @yieldparam [RDF::Statement] statement
# @return [void]
def each_statement(&block)
if block_given?
@recovering = false
@callback = block
begin
while (@lexer.first rescue true)
read_trigDoc
end
rescue EBNF::LL1::Lexer::Error, SyntaxError, EOFError, Recovery
# Terminate loop if EOF found while recovering
end
if validate? && log_statistics[:error]
raise RDF::ReaderError, "Errors found during processing"
end
end
enum_for(:each_statement)
end
##
# Iterates the given block for each RDF quad in the input.
#
# @yield [subject, predicate, object, graph_name]
# @yieldparam [RDF::Resource] subject
# @yieldparam [RDF::URI] predicate
# @yieldparam [RDF::Value] object
# @yieldparam [RDF::URI] graph_name
# @return [void]
def each_quad(&block)
if block_given?
each_statement do |statement|
block.call(*statement.to_quad)
end
end
enum_for(:each_quad)
end
# add a statement, object can be literal or URI or bnode
#
# @param [Symbol] production
# @param [RDF::Statement] statement the subject of the statement
# @return [RDF::Statement] Added statement
# @raise [RDF::ReaderError] Checks parameter types and raises if they are incorrect if parsing mode is _validate_.
def add_statement(production, statement)
error("Statement is invalid: #{statement.inspect.inspect}", production: produciton) if validate? && statement.invalid?
statement.graph_name = @graph_name if @graph_name
@callback.call(statement) if statement.subject &&
statement.predicate &&
statement.object &&
(validate? ? statement.valid? : true)
end
protected
# @return [Object]
def read_trigDoc
prod(:trigDoc, %(} .)) do
read_directive || read_block
end
end
# @return [Object]
def read_block
prod(:block, %(})) do
@graph_name = nil
token = @lexer.first
case token && (token.type || token.value)
when :GRAPH
@lexer.shift
@graph_name = read_labelOrSubject || error("Expected label or subject", production: :block, token: @lexer.first)
read_wrappedGraph || error("Expected wrappedGraph", production: :block, token: @lexer.first)
@graph_name = nil
when :IRIREF, :BLANK_NODE_LABEL, :ANON, :PNAME_LN, :PNAME_NS
read_triplesOrGraph || error("Expected triplesOrGraph", production: :block, token: @lexer.first)
when '{'
read_wrappedGraph || error("Expected wrappedGraph", production: :block, token: @lexer.first)
when '(', '[', '<<'
read_triples2 || error("Expected collection or blankNodePropertyList", production: :block, token: @lexer.first)
when nil
# End of input
else
error("Unexpected token: #{@lexer.first.inspect}", production: :block, token: @lexer.first)
end
end
end
# @return [Object]
def read_triplesOrGraph
while name = read_labelOrSubject
prod(:triplesOrGraph, %(} .)) do
token = @lexer.first
case token && token.value
when '{'
@graph_name = name
read_wrappedGraph || error("Expected wrappedGraph", production: :triplesOrGraph, token: @lexer.first)
@graph_name = nil
true
else
read_predicateObjectList(name) || error("Expected predicateObjectList", production: :triplesOrGraph, token: @lexer.first)
unless @recovering
# If recovering, we will have eaten the closing '.'
token = @lexer.shift
unless token && token.value == '.'
error("Expected '.' following triple", production: :triplesOrGraph, token: token)
end
end
end
end
end
true
end
# @return [Object]
def read_triples2
token = @lexer.first
case token && token.value
when '['
prod(:triples2) do
# blankNodePropertyList predicateObjectList?
subject = read_blankNodePropertyList || error("Failed to parse blankNodePropertyList", production: :triples2, token: @lexer.first)
read_predicateObjectList(subject)
if !@recovering || @lexer.first === '.'
# If recovering, we will have eaten the closing '.'
token = @lexer.shift
unless token && token.value == '.'
error("Expected '.' following triple", production: :triples2, token: token)
end
end
true
end
when '('
prod(:triples2) do
subject = read_collection || error("Failed to parse read_collection", production: :triples2, token: @lexer.first)
token = @lexer.first
case token && (token.type || token.value)
when 'a', :IRIREF, :PNAME_LN, :PNAME_NS then read_predicateObjectList(subject)
else error("Expected predicateObjectList after collection subject", production: :triples2, token: token)
end
if !@recovering || @lexer.first === '.'
# If recovering, we will have eaten the closing '.'
token = @lexer.shift
unless token && token.value == '.'
error("Expected '.' following triple", production: :triples2, token: token)
end
end
true
end
when '<<'
prod(:triples2) do
subject = read_quotedTriple || error("Failed to parse embedded triple", production: :triples2, token: @lexer.first)
token = @lexer.first
case token && (token.type || token.value)
when 'a', :IRIREF, :PNAME_LN, :PNAME_NS then read_predicateObjectList(subject)
else error("Expected predicateObjectList after collection subject", production: :triples2, token: token)
end
if !@recovering || @lexer.first === '.'
# If recovering, we will have eaten the closing '.'
token = @lexer.shift
unless token && token.value == '.'
error("Expected '.' following triple", production: :triples2, token: token)
end
end
true
end
end
end
# @return [Object]
def read_wrappedGraph
token = @lexer.first
if token && token.value == '{'
prod(:wrappedGraph, %w(})) do
@lexer.shift
while read_triplesBlock
# Read until nothing found
end
if !@recovering || @lexer.first === '}'
# If recovering, we will have eaten the closing '}'
token = @lexer.shift
unless token && token.value == '}'
error("Expected '}' following triple", production: :wrappedGraph, token: token)
end
end
true
end
end
end
# @return [Object]
def read_triplesBlock
prod(:triplesBlock, %w(.)) do
while (token = @lexer.first) && token.value != '}' && read_triples
unless log_recovering?
break unless @lexer.first === '.'
@lexer.shift
end
end
end
end
# @return [RDF::Resource]
def read_labelOrSubject
prod(:labelOrSubject) do
read_iri || read_BlankNode
end
end
end # class Reader
end # module RDF::Turtle