A parsed XPath expression that can be evaluated many times.
Constructors
new(source :
String, root :
Expr)
Wraps a syntax tree built by XPath.compile. A tree deeper than
the compiler allows is rejected here as well.
Instance methods
evaluate(node :
Node, namespaces :
Hash(
String,
String) |
Nil = nil, variables :
Hash(
String,
Value) |
Nil = nil, *, budget :
Core::WorkBudget =
DEFAULT_WORK_BUDGET, meter :
Core::WorkMeter |
Nil = nil) :
Value Evaluates the expression with node as the context node.
namespaces maps prefixes to URIs; when nil the namespaces declared
on the document's root element are used (the default namespace is
registered as xmlns). The evaluation runs under budget (its
units are the document's nodes plus the expression's bytes), or
draws on meter when given. Raises Mica::WorkBudgetExceededError
or Mica::DeadlineExceededError, positioned in the expression, when
it runs out.
evaluate_boolean(node :
Node, namespaces :
Hash(
String,
String) |
Nil = nil, variables :
Hash(
String,
Value) |
Nil = nil, *, budget :
Core::WorkBudget =
DEFAULT_WORK_BUDGET, meter :
Core::WorkMeter |
Nil = nil) :
Bool Evaluates the expression and converts the result with the XPath
boolean() rules inside the same budget.
evaluate_number(node :
Node, namespaces :
Hash(
String,
String) |
Nil = nil, variables :
Hash(
String,
Value) |
Nil = nil, *, budget :
Core::WorkBudget =
DEFAULT_WORK_BUDGET, meter :
Core::WorkMeter |
Nil = nil) :
Float64 Evaluates the expression and converts the result with the XPath
number() rules inside the same budget.
evaluate_string(node :
Node, namespaces :
Hash(
String,
String) |
Nil = nil, variables :
Hash(
String,
Value) |
Nil = nil, *, budget :
Core::WorkBudget =
DEFAULT_WORK_BUDGET, meter :
Core::WorkMeter |
Nil = nil) :
String Evaluates the expression and converts the result with the XPath
string() rules inside the same budget (the string value of a node
set's first node can be the text of the whole document).