Class: Oga::XPath::Compiler
- Inherits:
-
Object
- Object
- Oga::XPath::Compiler
- Defined in:
- lib/oga/xpath/compiler.rb
Overview
Compiling of XPath ASTs into Ruby code.
The Compiler class can be used to turn an XPath AST into Ruby source code that can be executed to match XML nodes in a given input document/element. Compiled source code is cached per expression, removing the need for recompiling the same expression over and over again.
Constant Summary collapse
- CACHE =
LRU.new
- CONTEXT =
Context for compiled Procs. As compiled Procs do not mutate the enclosing environment we can just re-use the same instance without synchronization.
Context.new
- STAR =
Wildcard for node names/namespace prefixes.
'*'
- RETURN_NODESET =
Node types that require a NodeSet to push nodes into.
[:path, :absolute_path, :axis, :predicate]
- OPERATORS =
Hash containing all operator callbacks, the conversion methods and the Ruby methods to use.
{ :on_add => [:to_float, :+], :on_sub => [:to_float, :-], :on_div => [:to_float, :/], :on_gt => [:to_float, :>], :on_gte => [:to_float, :>=], :on_lt => [:to_float, :<], :on_lte => [:to_float, :<=], :on_mul => [:to_float, :*], :on_mod => [:to_float, :%], :on_and => [:to_boolean, :and], :on_or => [:to_boolean, :or] }
Class Method Summary collapse
-
.compile_with_cache(ast, namespaces: nil) ⇒ Object
Compiles and caches an AST.
Instance Method Summary collapse
-
#argument_or_first_node(input, arg = nil) ⇒ Oga::Ruby::Node
-
#attribute_or_node(node) ⇒ Oga::Ruby::Node
-
#break ⇒ Oga::Ruby::Node
-
#catch_message(name) ⇒ Oga::Ruby::Node
-
#compile(ast) ⇒ Proc
Compiles an XPath AST into a Ruby Proc.
-
#document_or_node(node) ⇒ Oga::Ruby::Node
-
#element_or_attribute(node) ⇒ Oga::Ruby::Node
-
#ensure_element_or_attribute(input) ⇒ Oga::Ruby::Node
-
#false ⇒ Oga::Ruby::Node
-
#has_call_node?(ast, name) ⇒ TrueClass|FalseClass
-
#initialize(namespaces: nil) ⇒ Compiler
constructor
A new instance of Compiler.
-
#literal(value) ⇒ Oga::Ruby::Node
-
#mass_assign(vars, value) ⇒ Oga::Ruby::Node
-
#match_first_node(ast, input) ⇒ Oga::Ruby::Node
Returns an AST matching the first node of a node set.
-
#match_name_and_namespace(ast, input) ⇒ Oga::Ruby::Node
-
#matched_literal ⇒ Oga::Ruby::Node
-
#nil ⇒ Oga::Ruby::Node
-
#number?(ast) ⇒ TrueClass|FalseClass
-
#on_absolute_path(ast, input, &block) ⇒ Oga::Ruby::Node
-
#on_axis(ast, input, &block) ⇒ Oga::Ruby::Node
Dispatches the processing of axes to dedicated methods.
-
#on_axis_ancestor(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_ancestor_or_self(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_attribute(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_child(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_descendant(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_descendant_or_self(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_following(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_following_sibling(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_namespace(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_parent(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_preceding(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_preceding_sibling(ast, input) ⇒ Oga::Ruby::Node
-
#on_axis_self(ast, input) ⇒ Oga::Ruby::Node
-
#on_call(ast, input, &block) ⇒ Oga::Ruby::Node
Delegates function calls to specific handlers.
-
#on_call_boolean(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_ceiling(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_concat(input, *args) ⇒ Oga::Ruby::Node
-
#on_call_contains(input, haystack, needle) ⇒ Oga::Ruby::Node
-
#on_call_count(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_false ⇒ Oga::Ruby::Node
-
#on_call_floor(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_id(input, arg) ⇒ Oga::Ruby::Node
Processes the
id()
function call. -
#on_call_lang(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_last ⇒ Oga::Ruby::Node
-
#on_call_local_name(input, arg = nil) ⇒ Oga::Ruby::Node
-
#on_call_name(input, arg = nil) ⇒ Oga::Ruby::Node
-
#on_call_namespace_uri(input, arg = nil) ⇒ Oga::Ruby::Node
-
#on_call_normalize_space(input, arg = nil) ⇒ Oga::Ruby::Node
-
#on_call_not(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_number(input, arg = nil) ⇒ Oga::Ruby::Node
-
#on_call_position ⇒ Oga::Ruby::Node
-
#on_call_round(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_starts_with(input, haystack, needle) ⇒ Oga::Ruby::Node
-
#on_call_string(input, arg = nil) ⇒ Oga::Ruby::Node
-
#on_call_string_length(input, arg = nil) ⇒ Oga::Ruby::Node
-
#on_call_substring(input, haystack, start, length = nil) ⇒ Oga::Ruby::Node
-
#on_call_substring_after(input, haystack, needle) ⇒ Oga::Ruby::Node
-
#on_call_substring_before(input, haystack, needle) ⇒ Oga::Ruby::Node
-
#on_call_sum(input, arg) ⇒ Oga::Ruby::Node
-
#on_call_translate(input, source, find, replace) ⇒ Oga::Ruby::Node
-
#on_call_true ⇒ Oga::Ruby::Node
-
#on_eq(ast, input, &block) ⇒ Object
Processes the
=
operator. -
#on_float(ast) ⇒ Oga::Ruby::Node
-
#on_int(ast) ⇒ Oga::Ruby::Node
-
#on_neq(ast, input, &block) ⇒ Object
Processes the
!=
operator. -
#on_pipe(ast, input, &block) ⇒ Object
Processes the
|
operator. -
#on_predicate(ast, input, &block) ⇒ Oga::Ruby::Node
-
#on_predicate_direct(input, test, predicate) ⇒ Oga::Ruby::Node
Processes a predicate that doesn’t require temporary NodeSet.
-
#on_predicate_index(input, test, predicate) ⇒ Oga::Ruby::Node
Processes a predicate that uses a literal index.
-
#on_predicate_temporary(input, test, predicate) ⇒ Oga::Ruby::Node
Processes a predicate that requires a temporary NodeSet.
-
#on_string(ast) ⇒ Oga::Ruby::Node
-
#on_test(ast, input) ⇒ Oga::Ruby::Node
-
#on_type_test(ast, input, &block) ⇒ Oga::Ruby::Node
Delegates type tests to specific handlers.
-
#on_type_test_comment(input) ⇒ Oga::Ruby::Node
-
#on_type_test_node(input) ⇒ Oga::Ruby::Node
-
#on_type_test_processing_instruction(input) ⇒ Oga::Ruby::Node
-
#on_type_test_text(input) ⇒ Oga::Ruby::Node
-
#on_var(ast) ⇒ Oga::Ruby::Node
-
#operator(ast, input, optimize_first = true) ⇒ Oga::Ruby::Node
Generates the code for an operator.
-
#original_input_literal ⇒ Oga::Ruby::Node
-
#predicate_index ⇒ Oga::Ruby::Node
-
#predicate_nodeset ⇒ Oga::Ruby::Node
-
#process(ast, input, &block) ⇒ Oga::Ruby::Node
Processes a single XPath AST node.
-
#process_following_or_yield(following, matched, &block) ⇒ Oga::Ruby::Node
-
#raise_message(klass, message) ⇒ Oga::Ruby::Node
-
#range(start, stop) ⇒ Oga::Ruby::Node
-
#reset ⇒ Object
Resets the internal state.
-
#return_nodeset?(ast) ⇒ TrueClass|FalseClass
-
#send_message(name, *args) ⇒ Oga::Ruby::Node
-
#string(value) ⇒ Oga::Ruby::Node
-
#string?(ast) ⇒ TrueClass|FalseClass
-
#symbol(value) ⇒ Oga::Ruby::Node
-
#throw_message(name, *args) ⇒ Oga::Ruby::Node
-
#to_int(ast) ⇒ Oga::Ruby::Node
-
#true ⇒ Oga::Ruby::Node
-
#try_match_first_node(ast, input, optimize_first = true) ⇒ Object
Tries to match the first node in a set, otherwise processes it as usual.
-
#unique_literal(name) ⇒ Oga::Ruby::Node
-
#variables_literal ⇒ Oga::Ruby::Node
Constructor Details
#initialize(namespaces: nil) ⇒ Compiler
Returns a new instance of Compiler
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# File 'lib/oga/xpath/compiler.rb', line 51 def initialize(namespaces: nil) reset @namespaces = namespaces end |
Class Method Details
.compile_with_cache(ast, namespaces: nil) ⇒ Object
Compiles and caches an AST.
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# File 'lib/oga/xpath/compiler.rb', line 45 def self.compile_with_cache(ast, namespaces: nil) cache_key = namespaces ? [ast, namespaces] : ast CACHE.get_or_set(cache_key) { new(namespaces: namespaces).compile(ast) } end |
Instance Method Details
#argument_or_first_node(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1450 def argument_or_first_node(input, arg = nil) arg_ast = arg ? try_match_first_node(arg, input) : input arg_var = unique_literal(:argument_or_first_node) arg_var.assign(arg_ast).followed_by { yield arg_var } end |
#attribute_or_node(node) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1366 def attribute_or_node(node) node.is_a?(XML::Attribute).or(node.is_a?(XML::Node)) end |
#break ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1547 def break (:break) end |
#catch_message(name) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1531 def (name) (:catch, symbol(name)).add_block do # Ensure that the "catch" only returns a value when "throw" is # actually invoked. yield.followed_by(self.nil) end end |
#compile(ast) ⇒ Proc
Compiles an XPath AST into a Ruby Proc.
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# File 'lib/oga/xpath/compiler.rb', line 69 def compile(ast) document = literal(:node) matched = matched_literal if return_nodeset?(ast) ruby_ast = process(ast, document) { |node| matched.push(node) } else ruby_ast = process(ast, document) end vars = variables_literal.assign(self.nil) proc_ast = literal(:lambda).add_block(document, vars) do input_assign = original_input_literal.assign(document) if return_nodeset?(ast) body = matched.assign(literal(XML::NodeSet).new) .followed_by(ruby_ast) .followed_by(matched) else body = ruby_ast end input_assign.followed_by(body) end generator = Ruby::Generator.new source = generator.process(proc_ast) CONTEXT.evaluate(source) ensure reset end |
#document_or_node(node) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1372 def document_or_node(node) node.is_a?(XML::Document).or(node.is_a?(XML::Node)) end |
#element_or_attribute(node) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1360 def element_or_attribute(node) node.is_a?(XML::Element).or(node.is_a?(XML::Attribute)) end |
#ensure_element_or_attribute(input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1441 def ensure_element_or_attribute(input) element_or_attribute(input).if_false do (TypeError, 'argument is not an Element or Attribute') end end |
#false ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1354 def false @false ||= literal(:false) end |
#has_call_node?(ast, name) ⇒ TrueClass|FalseClass
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# File 'lib/oga/xpath/compiler.rb', line 1559 def has_call_node?(ast, name) visit = [ast] until visit.empty? current = visit.pop return true if current.type == :call && current.children[0] == name current.children.each do |child| visit << child if child.is_a?(AST::Node) end end false end |
#literal(value) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1298 def literal(value) Ruby::Node.new(:lit, [value.to_s]) end |
#mass_assign(vars, value) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1513 def mass_assign(vars, value) Ruby::Node.new(:massign, [vars, value]) end |
#match_first_node(ast, input) ⇒ Oga::Ruby::Node
Returns an AST matching the first node of a node set.
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# File 'lib/oga/xpath/compiler.rb', line 1420 def match_first_node(ast, input) (:value) do process(ast, input) do |node| (:value, node) end end end |
#match_name_and_namespace(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1379 def match_name_and_namespace(ast, input) ns, name = *ast condition = nil name_str = string(name) zero = literal(0) if name != STAR condition = input.name.eq(name_str) .or(input.name.casecmp(name_str).eq(zero)) end if ns and ns != STAR if @namespaces ns_uri = @namespaces[ns] ns_match = if ns_uri input.namespace.and(input.namespace.uri.eq(string(ns_uri))) else self.false end else ns_match = if ns == XML::Element::XMLNS_PREFIX input else input.namespace_name.eq(string(ns)) end end condition = condition ? condition.and(ns_match) : ns_match end condition end |
#matched_literal ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1490 def matched_literal literal(:matched) end |
#nil ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1344 def nil @nil ||= literal(:nil) end |
#number?(ast) ⇒ TrueClass|FalseClass
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# File 'lib/oga/xpath/compiler.rb', line 1519 def number?(ast) ast.type == :int || ast.type == :float end |
#on_absolute_path(ast, input, &block) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 115 def on_absolute_path(ast, input, &block) if ast.children.empty? matched_literal.push(input.root_node) else process(ast.children[0], input.root_node, &block) end end |
#on_axis(ast, input, &block) ⇒ Oga::Ruby::Node
Dispatches the processing of axes to dedicated methods. This works similar to #process except the handler names are “on_axis_X” with “X” being the axis name.
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# File 'lib/oga/xpath/compiler.rb', line 130 def on_axis(ast, input, &block) name, test, following = *ast handler = name.gsub('-', '_') send(:"on_axis_#{handler}", test, input) do |matched| process_following_or_yield(following, matched, &block) end end |
#on_axis_ancestor(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 192 def on_axis_ancestor(ast, input) parent = unique_literal(:parent) attribute_or_node(input).if_true do input.each_ancestor.add_block(parent) do process(ast, parent).if_true { yield parent } end end end |
#on_axis_ancestor_or_self(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 175 def on_axis_ancestor_or_self(ast, input) parent = unique_literal(:parent) process(ast, input).and(input.is_a?(XML::Node)) .if_true { yield input } .followed_by do attribute_or_node(input).if_true do input.each_ancestor.add_block(parent) do process(ast, parent).if_true { yield parent } end end end end |
#on_axis_attribute(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 156 def on_axis_attribute(ast, input) input.is_a?(XML::Element).if_true do attribute = unique_literal(:attribute) input.attributes.each.add_block(attribute) do name_match = match_name_and_namespace(ast, attribute) if name_match name_match.if_true { yield attribute } else yield attribute end end end end |
#on_axis_child(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 143 def on_axis_child(ast, input) child = unique_literal(:child) document_or_node(input).if_true do input.children.each.add_block(child) do process(ast, child).if_true { yield child } end end end |
#on_axis_descendant(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 222 def on_axis_descendant(ast, input) node = unique_literal(:descendant) document_or_node(input).if_true do input.each_node.add_block(node) do process(ast, node).if_true { yield node } end end end |
#on_axis_descendant_or_self(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 205 def on_axis_descendant_or_self(ast, input) node = unique_literal(:descendant) document_or_node(input).if_true do process(ast, input) .if_true { yield input } .followed_by do input.each_node.add_block(node) do process(ast, node).if_true { yield node } end end end end |
#on_axis_following(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 295 def on_axis_following(ast, input) orig_input = original_input_literal doc_node = literal(:doc_node) check = literal(:check) root = literal(:root) orig_input.is_a?(XML::Node) .if_true { root.assign(orig_input.root_node) } .else { root.assign(orig_input) } .followed_by(check.assign(self.false)) .followed_by do document_or_node(root).if_true do root.each_node.add_block(doc_node) do doc_node.eq(input) .if_true do check.assign(self.true) .followed_by((:skip_children)) end .followed_by do check.if_false { (:next) } end .followed_by do process(ast, doc_node).if_true { yield doc_node } end end end end end |
#on_axis_following_sibling(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 255 def on_axis_following_sibling(ast, input) orig_input = original_input_literal doc_node = literal(:doc_node) check = literal(:check) parent = literal(:parent) root = literal(:root) orig_input.is_a?(XML::Node) .if_true { root.assign(orig_input.parent) } .else { root.assign(orig_input) } .followed_by do input.is_a?(XML::Node).and(input.parent) .if_true { parent.assign(input.parent) } .else { parent.assign(self.nil) } end .followed_by(check.assign(self.false)) .followed_by do document_or_node(root).if_true do root.each_node.add_block(doc_node) do doc_node.eq(input) .if_true do check.assign(self.true) .followed_by((:skip_children)) end .followed_by do check.not.or(parent != doc_node.parent).if_true do (:next) end end .followed_by do process(ast, doc_node).if_true { yield doc_node } end end end end end |
#on_axis_namespace(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 327 def on_axis_namespace(ast, input) underscore = literal(:_) node = unique_literal(:namespace) name = string(ast.children[1]) star = string(STAR) input.is_a?(XML::Element).if_true do input.available_namespaces.each.add_block(underscore, node) do node.name.eq(name).or(name.eq(star)).if_true { yield node } end end end |
#on_axis_parent(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 235 def on_axis_parent(ast, input) parent = unique_literal(:parent) attribute_or_node(input).if_true do parent.assign(input.parent).followed_by do process(ast, parent).if_true { yield parent } end end end |
#on_axis_preceding(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 344 def on_axis_preceding(ast, input) root = literal(:root) doc_node = literal(:doc_node) input.is_a?(XML::Node).if_true do root.assign(input.root_node) .followed_by do document_or_node(root).if_true do root.each_node.add_block(doc_node) do doc_node.eq(input) .if_true { self.break } .followed_by do process(ast, doc_node).if_true { yield doc_node } end end end end end end |
#on_axis_preceding_sibling(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 367 def on_axis_preceding_sibling(ast, input) orig_input = original_input_literal check = literal(:check) root = literal(:root) parent = literal(:parent) doc_node = literal(:doc_node) orig_input.is_a?(XML::Node) .if_true { root.assign(orig_input.parent) } .else { root.assign(orig_input) } .followed_by(check.assign(self.false)) .followed_by do input.is_a?(XML::Node).and(input.parent) .if_true { parent.assign(input.parent) } .else { parent.assign(self.nil) } end .followed_by do document_or_node(root).if_true do root.each_node.add_block(doc_node) do doc_node.eq(input) .if_true { self.break } .followed_by do doc_node.parent.eq(parent).if_true do process(ast, doc_node).if_true { yield doc_node } end end end end end end |
#on_axis_self(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 248 def on_axis_self(ast, input) process(ast, input).if_true { yield input } end |
#on_call(ast, input, &block) ⇒ Oga::Ruby::Node
Delegates function calls to specific handlers.
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# File 'lib/oga/xpath/compiler.rb', line 645 def on_call(ast, input, &block) name, *args = *ast handler = name.gsub('-', '_') send(:"on_call_#{handler}", input, *args, &block) end |
#on_call_boolean(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 666 def on_call_boolean(input, arg) arg_ast = try_match_first_node(arg, input) call_arg = unique_literal(:call_arg) conversion = literal(Conversion) call_arg.assign(arg_ast).followed_by do converted = conversion.to_boolean(call_arg) block_given? ? converted.if_true { yield } : converted end end |
#on_call_ceiling(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 681 def on_call_ceiling(input, arg) arg_ast = try_match_first_node(arg, input) call_arg = unique_literal(:call_arg) conversion = literal(Conversion) call_arg.assign(arg_ast) .followed_by do call_arg.assign(conversion.to_float(call_arg)) end .followed_by do call_arg.nan? .if_true { call_arg } .else { block_given? ? yield : call_arg.ceil.to_f } end end |
#on_call_concat(input, *args) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 738 def on_call_concat(input, *args) conversion = literal(Conversion) assigns = [] conversions = [] args.each do |arg| arg_var = unique_literal(:concat_arg) arg_ast = try_match_first_node(arg, input) assigns << arg_var.assign(arg_ast) conversions << conversion.to_string(arg_var) end concatted = assigns.inject(:followed_by) .followed_by(conversions.inject(:+)) block_given? ? concatted.empty?.if_false { yield } : concatted end |
#on_call_contains(input, haystack, needle) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 761 def on_call_contains(input, haystack, needle) haystack_lit = unique_literal(:haystack) needle_lit = unique_literal(:needle) conversion = literal(Conversion) haystack_lit.assign(try_match_first_node(haystack, input)) .followed_by do needle_lit.assign(try_match_first_node(needle, input)) end .followed_by do converted = conversion.to_string(haystack_lit) .include?(conversion.to_string(needle_lit)) block_given? ? converted.if_true { yield } : converted end end |
#on_call_count(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 781 def on_call_count(input, arg) count = unique_literal(:count) unless return_nodeset?(arg) raise TypeError, 'count() can only operate on NodeSet instances' end count.assign(literal(0.0)) .followed_by do process(arg, input) { count.assign(count + literal(1)) } end .followed_by do block_given? ? count.zero?.if_false { yield } : count end end |
#on_call_false ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 659 def on_call_false(*) self.false end |
#on_call_floor(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 700 def on_call_floor(input, arg) arg_ast = try_match_first_node(arg, input) call_arg = unique_literal(:call_arg) conversion = literal(Conversion) call_arg.assign(arg_ast) .followed_by do call_arg.assign(conversion.to_float(call_arg)) end .followed_by do call_arg.nan? .if_true { call_arg } .else { block_given? ? yield : call_arg.floor.to_f } end end |
#on_call_id(input, arg) ⇒ Oga::Ruby::Node
Processes the id()
function call.
The XPath specification states that this function’s behaviour should be controlled by a DTD. If a DTD were to specify that the ID attribute for a certain element would be “foo” then this function should use said attribute.
Oga does not support DTD parsing/evaluation and as such always uses the “id” attribute.
This function searches the entire document for a matching node, regardless of the current position.
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# File 'lib/oga/xpath/compiler.rb', line 813 def on_call_id(input, arg) orig_input = original_input_literal node = unique_literal(:node) ids_var = unique_literal('ids') matched = unique_literal('id_matched') id_str_var = unique_literal('id_string') attr_var = unique_literal('attr') matched.assign(literal(XML::NodeSet).new) .followed_by do # When using some sort of path we'll want the text of all matched # nodes. if return_nodeset?(arg) ids_var.assign(literal(:[])).followed_by do process(arg, input) { |element| ids_var << element.text } end # For everything else we'll cast the value to a string and split it # on every space. else conversion = literal(Conversion).to_string(ids_var) .split(string(' ')) ids_var.assign(process(arg, input)) .followed_by(ids_var.assign(conversion)) end end .followed_by do id_str_var.assign(string('id')) end .followed_by do orig_input.each_node.add_block(node) do node.is_a?(XML::Element).if_true do attr_var.assign(node.attribute(id_str_var)).followed_by do attr_var.and(ids_var.include?(attr_var.value)) .if_true { block_given? ? yield : matched << node } end end end end .followed_by(matched) end |
#on_call_lang(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 859 def on_call_lang(input, arg) lang_var = unique_literal('lang') node = unique_literal('node') found = unique_literal('found') xml_lang = unique_literal('xml_lang') matched = unique_literal('matched') conversion = literal(Conversion) ast = lang_var.assign(try_match_first_node(arg, input)) .followed_by do lang_var.assign(conversion.to_string(lang_var)) end .followed_by do matched.assign(self.false) end .followed_by do node.assign(input) end .followed_by do xml_lang.assign(string('xml:lang')) end .followed_by do node.respond_to?(symbol(:attribute)).while_true do found.assign(node.get(xml_lang)) .followed_by do found.if_true do found.eq(lang_var) .if_true do if block_given? yield else matched.assign(self.true).followed_by(self.break) end end .else { self.break } end end .followed_by(node.assign(node.parent)) end end block_given? ? ast : ast.followed_by(matched) end |
#on_call_last ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1236 def on_call_last(*) set = predicate_nodeset unless set raise 'last() can only be used in a predicate' end set.length.to_f end |
#on_call_local_name(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 907 def on_call_local_name(input, arg = nil) argument_or_first_node(input, arg) do |arg_var| arg_var .if_true do ensure_element_or_attribute(arg_var) .followed_by { block_given? ? yield : arg_var.name } end .else { string('') } end end |
#on_call_name(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 921 def on_call_name(input, arg = nil) argument_or_first_node(input, arg) do |arg_var| arg_var .if_true do ensure_element_or_attribute(arg_var) .followed_by { block_given? ? yield : arg_var. } end .else { string('') } end end |
#on_call_namespace_uri(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 935 def on_call_namespace_uri(input, arg = nil) default = string('') argument_or_first_node(input, arg) do |arg_var| arg_var .if_true do ensure_element_or_attribute(arg_var).followed_by do arg_var.namespace .if_true { block_given? ? yield : arg_var.namespace.uri } .else { default } # no yield so predicates aren't matched end end .else { default } end end |
#on_call_normalize_space(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 954 def on_call_normalize_space(input, arg = nil) conversion = literal(Conversion) norm_var = unique_literal(:normalized) find = literal('/\s+/') replace = string(' ') argument_or_first_node(input, arg) do |arg_var| norm_var .assign(conversion.to_string(arg_var).strip.gsub(find, replace)) .followed_by do norm_var.empty? .if_true { string('') } .else { block_given? ? yield : norm_var } end end end |
#on_call_not(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 975 def on_call_not(input, arg) arg_ast = try_match_first_node(arg, input) call_arg = unique_literal(:call_arg) conversion = literal(Conversion) call_arg.assign(arg_ast).followed_by do converted = conversion.to_boolean(call_arg).not block_given? ? converted.if_true { yield } : converted end end |
#on_call_number(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 990 def on_call_number(input, arg = nil) convert_var = unique_literal(:convert) conversion = literal(Conversion) argument_or_first_node(input, arg) do |arg_var| convert_var.assign(conversion.to_float(arg_var)).followed_by do if block_given? convert_var.zero?.if_false { yield } else convert_var end end end end |
#on_call_position ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1247 def on_call_position(*) index = predicate_index unless index raise 'position() can only be used in a predicate' end index.to_f end |
#on_call_round(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 719 def on_call_round(input, arg) arg_ast = try_match_first_node(arg, input) call_arg = unique_literal(:call_arg) conversion = literal(Conversion) call_arg.assign(arg_ast) .followed_by do call_arg.assign(conversion.to_float(call_arg)) end .followed_by do call_arg.nan? .if_true { call_arg } .else { block_given? ? yield : call_arg.round.to_f } end end |
#on_call_starts_with(input, haystack, needle) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1009 def on_call_starts_with(input, haystack, needle) haystack_var = unique_literal(:haystack) needle_var = unique_literal(:needle) conversion = literal(Conversion) haystack_var.assign(try_match_first_node(haystack, input)) .followed_by do needle_var.assign(try_match_first_node(needle, input)) end .followed_by do haystack_var.assign(conversion.to_string(haystack_var)) .followed_by do needle_var.assign(conversion.to_string(needle_var)) end .followed_by do equal = needle_var.empty? .or(haystack_var.start_with?(needle_var)) block_given? ? equal.if_true { yield } : equal end end end |
#on_call_string(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1054 def on_call_string(input, arg = nil) convert_var = unique_literal(:convert) conversion = literal(Conversion) argument_or_first_node(input, arg) do |arg_var| convert_var.assign(conversion.to_string(arg_var)) .followed_by do if block_given? convert_var.empty?.if_false { yield } else convert_var end end end end |
#on_call_string_length(input, arg = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1035 def on_call_string_length(input, arg = nil) convert_var = unique_literal(:convert) conversion = literal(Conversion) argument_or_first_node(input, arg) do |arg_var| convert_var.assign(conversion.to_string(arg_var).length) .followed_by do if block_given? convert_var.zero?.if_false { yield } else convert_var.to_f end end end end |
#on_call_substring(input, haystack, start, length = nil) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1133 def on_call_substring(input, haystack, start, length = nil) haystack_var = unique_literal(:haystack) start_var = unique_literal(:start) stop_var = unique_literal(:stop) length_var = unique_literal(:length) conversion = literal(Conversion) haystack_var.assign(try_match_first_node(haystack, input)) .followed_by do start_var.assign(try_match_first_node(start, input)) .followed_by do start_var.assign(start_var - literal(1)) end end .followed_by do if length length_var.assign(try_match_first_node(length, input)) .followed_by do length_int = conversion.to_float(length_var) .to_i - literal(1) stop_var.assign(start_var + length_int) end else stop_var.assign(literal(-1)) end end .followed_by do substring = conversion .to_string(haystack_var)[range(start_var, stop_var)] block_given? ? substring.empty?.if_false { yield } : substring end end |
#on_call_substring_after(input, haystack, needle) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1103 def on_call_substring_after(input, haystack, needle) haystack_var = unique_literal(:haystack) needle_var = unique_literal(:needle) conversion = literal(Conversion) before = unique_literal(:before) sep = unique_literal(:sep) after = unique_literal(:after) haystack_var.assign(try_match_first_node(haystack, input)) .followed_by do needle_var.assign(try_match_first_node(needle, input)) end .followed_by do converted = conversion.to_string(haystack_var) .partition(conversion.to_string(needle_var)) mass_assign([before, sep, after], converted).followed_by do sep.empty? .if_true { sep } .else { block_given? ? yield : after } end end end |
#on_call_substring_before(input, haystack, needle) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1074 def on_call_substring_before(input, haystack, needle) haystack_var = unique_literal(:haystack) needle_var = unique_literal(:needle) conversion = literal(Conversion) before = unique_literal(:before) sep = unique_literal(:sep) after = unique_literal(:after) haystack_var.assign(try_match_first_node(haystack, input)) .followed_by do needle_var.assign(try_match_first_node(needle, input)) end .followed_by do converted = conversion.to_string(haystack_var) .partition(conversion.to_string(needle_var)) mass_assign([before, sep, after], converted).followed_by do sep.empty? .if_true { sep } .else { block_given? ? yield : before } end end end |
#on_call_sum(input, arg) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1171 def on_call_sum(input, arg) unless return_nodeset?(arg) raise TypeError, 'sum() can only operate on a path, axis or predicate' end sum_var = unique_literal(:sum) conversion = literal(Conversion) sum_var.assign(literal(0.0)) .followed_by do process(arg, input) do |matched_node| sum_var.assign(sum_var + conversion.to_float(matched_node.text)) end end .followed_by do block_given? ? sum_var.zero?.if_false { yield } : sum_var end end |
#on_call_translate(input, source, find, replace) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1195 def on_call_translate(input, source, find, replace) source_var = unique_literal(:source) find_var = unique_literal(:find) replace_var = unique_literal(:replace) replaced_var = unique_literal(:replaced) conversion = literal(Conversion) char = unique_literal(:char) index = unique_literal(:index) source_var.assign(try_match_first_node(source, input)) .followed_by do replaced_var.assign(conversion.to_string(source_var)) end .followed_by do find_var.assign(try_match_first_node(find, input)) end .followed_by do find_var.assign(conversion.to_string(find_var).chars.to_array) end .followed_by do replace_var.assign(try_match_first_node(replace, input)) end .followed_by do replace_var.assign(conversion.to_string(replace_var).chars.to_array) end .followed_by do find_var.each_with_index.add_block(char, index) do replace_with = replace_var[index] .if_true { replace_var[index] } .else { string('') } replaced_var.assign(replaced_var.gsub(char, replace_with)) end end .followed_by do replaced_var end end |
#on_call_true ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 654 def on_call_true(*) block_given? ? yield : self.true end |
#on_eq(ast, input, &block) ⇒ Object
Processes the =
operator.
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# File 'lib/oga/xpath/compiler.rb', line 548 def on_eq(ast, input, &block) conv = literal(Conversion) operator(ast, input) do |left, right| mass_assign([left, right], conv.to_compatible_types(left, right)) .followed_by do operation = left.eq(right) block ? operation.if_true(&block) : operation end end end |
#on_float(ast) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 627 def on_float(ast, *) literal(ast.children[0].to_s) end |
#on_int(ast) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 621 def on_int(ast, *) literal(ast.children[0].to_f.to_s) end |
#on_neq(ast, input, &block) ⇒ Object
Processes the !=
operator.
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# File 'lib/oga/xpath/compiler.rb', line 564 def on_neq(ast, input, &block) conv = literal(Conversion) operator(ast, input) do |left, right| mass_assign([left, right], conv.to_compatible_types(left, right)) .followed_by do operation = left != right block ? operation.if_true(&block) : operation end end end |
#on_pipe(ast, input, &block) ⇒ Object
Processes the |
operator.
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# File 'lib/oga/xpath/compiler.rb', line 594 def on_pipe(ast, input, &block) left, right = *ast union = unique_literal(:union) # Expressions such as "a | b | c" if left.type == :pipe union.assign(process(left, input)) .followed_by(process(right, input) { |node| union << node }) .followed_by(union) # Expressions such as "a | b" else union.assign(literal(XML::NodeSet).new) .followed_by(process(left, input) { |node| union << node }) .followed_by(process(right, input) { |node| union << node }) .followed_by(union) end end |
#on_predicate(ast, input, &block) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 401 def on_predicate(ast, input, &block) test, predicate, following = *ast index_var = unique_literal(:index) if number?(predicate) method = :on_predicate_index elsif has_call_node?(predicate, 'last') method = :on_predicate_temporary else method = :on_predicate_direct end @predicate_indexes << index_var ast = index_var.assign(literal(1)).followed_by do send(method, input, test, predicate) do |matched| process_following_or_yield(following, matched, &block) end end @predicate_indexes.pop ast end |
#on_predicate_direct(input, test, predicate) ⇒ Oga::Ruby::Node
Processes a predicate that doesn’t require temporary NodeSet.
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# File 'lib/oga/xpath/compiler.rb', line 478 def on_predicate_direct(input, test, predicate) pred_var = unique_literal(:pred_var) index_var = predicate_index index_step = literal(1) conversion = literal(Conversion) process(test, input) do |matched_test_node| if return_nodeset?(predicate) pred_ast = (:predicate_matched) do process(predicate, matched_test_node) do (:predicate_matched, self.true) end end else pred_ast = process(predicate, matched_test_node) end pred_var.assign(pred_ast) .followed_by do pred_var.is_a?(Numeric).if_true do pred_var.assign(pred_var.to_i.eq(index_var)) end end .followed_by do conversion.to_boolean(pred_var).if_true do yield matched_test_node end end .followed_by do index_var.assign(index_var + index_step) end end end |
#on_predicate_index(input, test, predicate) ⇒ Oga::Ruby::Node
Processes a predicate that uses a literal index.
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# File 'lib/oga/xpath/compiler.rb', line 518 def on_predicate_index(input, test, predicate) index_var = predicate_index index_step = literal(1) index = process(predicate, input).to_i process(test, input) do |matched_test_node| index_var.eq(index) .if_true do yield matched_test_node end .followed_by do index_var.assign(index_var + index_step) end end end |
#on_predicate_temporary(input, test, predicate) ⇒ Oga::Ruby::Node
Processes a predicate that requires a temporary NodeSet.
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# File 'lib/oga/xpath/compiler.rb', line 433 def on_predicate_temporary(input, test, predicate) temp_set = unique_literal(:temp_set) pred_node = unique_literal(:pred_node) pred_var = unique_literal(:pred_var) conversion = literal(Conversion) index_var = predicate_index index_step = literal(1) @predicate_nodesets << temp_set ast = temp_set.assign(literal(XML::NodeSet).new) .followed_by do process(test, input) { |node| temp_set << node } end .followed_by do temp_set.each.add_block(pred_node) do pred_ast = process(predicate, pred_node) pred_var.assign(pred_ast) .followed_by do pred_var.is_a?(Numeric).if_true do pred_var.assign(pred_var.to_i.eq(index_var)) end end .followed_by do conversion.to_boolean(pred_var).if_true { yield pred_node } end .followed_by do index_var.assign(index_var + index_step) end end end @predicate_nodesets.pop ast end |
#on_string(ast) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 615 def on_string(ast, *) string(ast.children[0]) end |
#on_test(ast, input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 538 def on_test(ast, input) condition = element_or_attribute(input) name_match = match_name_and_namespace(ast, input) name_match ? condition.and(name_match) : condition end |
#on_type_test(ast, input, &block) ⇒ Oga::Ruby::Node
Delegates type tests to specific handlers.
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# File 'lib/oga/xpath/compiler.rb', line 1262 def on_type_test(ast, input, &block) name, following = *ast handler = name.gsub('-', '_') send(:"on_type_test_#{handler}", input) do |matched| process_following_or_yield(following, matched, &block) end end |
#on_type_test_comment(input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1274 def on_type_test_comment(input) input.is_a?(XML::Comment) end |
#on_type_test_node(input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1292 def on_type_test_node(input) document_or_node(input).or(input.is_a?(XML::Attribute)) end |
#on_type_test_processing_instruction(input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1286 def on_type_test_processing_instruction(input) input.is_a?(XML::ProcessingInstruction) end |
#on_type_test_text(input) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1280 def on_type_test_text(input) input.is_a?(XML::Text) end |
#on_var(ast) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 633 def on_var(ast, *) name = ast.children[0] variables_literal.and(variables_literal[string(name)]) .or((:raise, string("Undefined XPath variable: #{name}"))) end |
#operator(ast, input, optimize_first = true) ⇒ Oga::Ruby::Node
Generates the code for an operator.
The generated code is optimized so that expressions such as a/b = c
only match the first node in both arms instead of matching all available
nodes first. Because numeric operators only ever operates on the first
node in a set we can simply ditch the rest, possibly speeding things up
quite a bit. This only works if one of the arms is:
- a path
- an axis
- a predicate
Everything else is processed the usual (and possibly slower) way.
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# File 'lib/oga/xpath/compiler.rb', line 1475 def operator(ast, input, optimize_first = true) left, right = *ast left_var = unique_literal(:op_left) right_var = unique_literal(:op_right) left_ast = try_match_first_node(left, input, optimize_first) right_ast = try_match_first_node(right, input, optimize_first) left_var.assign(left_ast) .followed_by(right_var.assign(right_ast)) .followed_by { yield left_var, right_var } end |
#original_input_literal ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1495 def original_input_literal literal(:original_input) end |
#predicate_index ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1576 def predicate_index @predicate_indexes.last end |
#predicate_nodeset ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1581 def predicate_nodeset @predicate_nodesets.last end |
#process(ast, input, &block) ⇒ Oga::Ruby::Node
Processes a single XPath AST node.
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# File 'lib/oga/xpath/compiler.rb', line 108 def process(ast, input, &block) send("on_#{ast.type}", ast, input, &block) end |
#process_following_or_yield(following, matched, &block) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1588 def process_following_or_yield(following, matched, &block) if following process(following, matched, &block) else yield matched end end |
#raise_message(klass, message) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1339 def (klass, ) (:raise, literal(klass), string()) end |
#range(start, stop) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1305 def range(start, stop) Ruby::Node.new(:range, [start, stop]) end |
#reset ⇒ Object
Resets the internal state.
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# File 'lib/oga/xpath/compiler.rb', line 58 def reset @literal_id = 0 @predicate_nodesets = [] @predicate_indexes = [] end |
#return_nodeset?(ast) ⇒ TrueClass|FalseClass
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# File 'lib/oga/xpath/compiler.rb', line 1553 def return_nodeset?(ast) RETURN_NODESET.include?(ast.type) end |
#send_message(name, *args) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1332 def (name, *args) Ruby::Node.new(:send, [nil, name.to_s, *args]) end |
#string(value) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1319 def string(value) Ruby::Node.new(:string, [value.to_s]) end |
#string?(ast) ⇒ TrueClass|FalseClass
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# File 'lib/oga/xpath/compiler.rb', line 1525 def string?(ast) ast.type == :string end |
#symbol(value) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1325 def symbol(value) Ruby::Node.new(:symbol, [value.to_sym]) end |
#throw_message(name, *args) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1542 def (name, *args) (:throw, symbol(name), *args) end |
#to_int(ast) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1506 def to_int(ast) literal(ast.children[0].to_i.to_s) end |
#true ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1349 def true @true ||= literal(:true) end |
#try_match_first_node(ast, input, optimize_first = true) ⇒ Object
Tries to match the first node in a set, otherwise processes it as usual.
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# File 'lib/oga/xpath/compiler.rb', line 1431 def try_match_first_node(ast, input, optimize_first = true) if return_nodeset?(ast) and optimize_first match_first_node(ast, input) else process(ast, input) end end |
#unique_literal(name) ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1311 def unique_literal(name) new_id = @literal_id += 1 literal("#{name}#{new_id}") end |
#variables_literal ⇒ Oga::Ruby::Node
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# File 'lib/oga/xpath/compiler.rb', line 1500 def variables_literal literal(:variables) end |