Class Addressable::Template
In: lib/addressable/template.rb
Parent: Object

This is an implementation of a URI template based on <a href="URI">tinyurl.com/uritemplatedraft03">URI Template draft 03</a>.

Methods

Classes and Modules

Class Addressable::Template::InvalidTemplateOperatorError
Class Addressable::Template::InvalidTemplateValueError
Class Addressable::Template::MatchData
Class Addressable::Template::TemplateOperatorAbortedError

Constants

OPERATOR_EXPANSION = /\{-([a-zA-Z]+)\|([#{anything}]+)\|([#{anything}]+)\}/
VARIABLE_EXPANSION = /\{([#{anything}]+?)(?:=([#{anything}]+))?\}/

Attributes

pattern  [R]  @return [String] The Template object‘s pattern.

Public Class methods

Creates a new Addressable::Template object.

@param [to_str] pattern The URI Template pattern.

@return [Addressable::Template] The initialized Template object.

Public Instance methods

Expands a URI template into a full URI.

@param [Hash] mapping The mapping that corresponds to the pattern. @param [validate, transform] processor

  An optional processor object may be supplied.

The object should respond to either the validate or transform messages or both. Both the validate and transform methods should take two parameters: name and value. The validate method should return true or false; true if the value of the variable is valid, false otherwise. An InvalidTemplateValueError exception will be raised if the value is invalid. The transform method should return the transformed variable value as a String. If a transform method is used, the value will not be percent encoded automatically. Unicode normalization will be performed both before and after sending the value to the transform method.

@return [Addressable::URI] The expanded URI template.

@example

  class ExampleProcessor
    def self.validate(name, value)
      return !!(value =~ /^[\w ]+$/) if name == "query"
      return true
    end

    def self.transform(name, value)
      return value.gsub(/ /, "+") if name == "query"
      return value
    end
  end

  Addressable::Template.new(
    "http://example.com/search/{query}/"
  ).expand(
    {"query" => "an example search query"},
    ExampleProcessor
  ).to_str
  #=> "http://example.com/search/an+example+search+query/"

  Addressable::Template.new(
    "http://example.com/search/{-list|+|query}/"
  ).expand(
    {"query" => "an example search query".split(" ")}
  ).to_str
  #=> "http://example.com/search/an+example+search+query/"

  Addressable::Template.new(
    "http://example.com/search/{query}/"
  ).expand(
    {"query" => "bogus!"},
    ExampleProcessor
  ).to_str
  #=> Addressable::Template::InvalidTemplateValueError

Extracts a mapping from the URI using a URI Template pattern.

@param [Addressable::URI, to_str] uri

  The URI to extract from.

@param [restore, match] processor

  A template processor object may optionally be supplied.

The object should respond to either the restore or match messages or both. The restore method should take two parameters: [String] name and [String] value. The restore method should reverse any transformations that have been performed on the value to ensure a valid URI. The match method should take a single parameter: [String] name. The match method should return a String containing a regular expression capture group for matching on that particular variable. The default value is ".*?". The match method has no effect on multivariate operator expansions.

@return [Hash, NilClass] The Hash mapping that was extracted from the URI, or nil if the URI didn‘t match the template.

@example

  class ExampleProcessor
    def self.restore(name, value)
      return value.gsub(/\+/, " ") if name == "query"
      return value
    end

    def self.match(name)
      return ".*?" if name == "first"
      return ".*"
    end
  end

  uri = Addressable::URI.parse(
    "http://example.com/search/an+example+search+query/"
  )
  Addressable::Template.new(
    "http://example.com/search/{query}/"
  ).extract(uri, ExampleProcessor)
  #=> {"query" => "an example search query"}

  uri = Addressable::URI.parse("http://example.com/a/b/c/")
  Addressable::Template.new(
    "http://example.com/{first}/{second}/"
  ).extract(uri, ExampleProcessor)
  #=> {"first" => "a", "second" => "b/c"}

  uri = Addressable::URI.parse("http://example.com/a/b/c/")
  Addressable::Template.new(
    "http://example.com/{first}/{-list|/|second}/"
  ).extract(uri)
  #=> {"first" => "a", "second" => ["b", "c"]}

Returns a String representation of the Template object‘s state.

@return [String] The Template object‘s state, as a String.

keys()

Alias for variables

Extracts match data from the URI using a URI Template pattern.

@param [Addressable::URI, to_str] uri

  The URI to extract from.

@param [restore, match] processor

  A template processor object may optionally be supplied.

The object should respond to either the restore or match messages or both. The restore method should take two parameters: [String] name and [String] value. The restore method should reverse any transformations that have been performed on the value to ensure a valid URI. The match method should take a single parameter: [String] name. The match method should return a String containing a regular expression capture group for matching on that particular variable. The default value is ".*?". The match method has no effect on multivariate operator expansions.

@return [Hash, NilClass] The Hash mapping that was extracted from the URI, or nil if the URI didn‘t match the template.

@example

  class ExampleProcessor
    def self.restore(name, value)
      return value.gsub(/\+/, " ") if name == "query"
      return value
    end

    def self.match(name)
      return ".*?" if name == "first"
      return ".*"
    end
  end

  uri = Addressable::URI.parse(
    "http://example.com/search/an+example+search+query/"
  )
  match = Addressable::Template.new(
    "http://example.com/search/{query}/"
  ).match(uri, ExampleProcessor)
  match.variables
  #=> ["query"]
  match.captures
  #=> ["an example search query"]

  uri = Addressable::URI.parse("http://example.com/a/b/c/")
  match = Addressable::Template.new(
    "http://example.com/{first}/{second}/"
  ).match(uri, ExampleProcessor)
  match.variables
  #=> ["first", "second"]
  match.captures
  #=> ["a", "b/c"]

  uri = Addressable::URI.parse("http://example.com/a/b/c/")
  match = Addressable::Template.new(
    "http://example.com/{first}/{-list|/|second}/"
  ).match(uri)
  match.variables
  #=> ["first", "second"]
  match.captures
  #=> ["a", ["b", "c"]]

Expands a URI template into another URI template.

@param [Hash] mapping The mapping that corresponds to the pattern. @param [validate, transform] processor

  An optional processor object may be supplied.

The object should respond to either the validate or transform messages or both. Both the validate and transform methods should take two parameters: name and value. The validate method should return true or false; true if the value of the variable is valid, false otherwise. An InvalidTemplateValueError exception will be raised if the value is invalid. The transform method should return the transformed variable value as a String. If a transform method is used, the value will not be percent encoded automatically. Unicode normalization will be performed both before and after sending the value to the transform method.

@return [Addressable::Template] The partially expanded URI template.

@example

  Addressable::Template.new(
    "http://example.com/{one}/{two}/"
  ).partial_expand({"one" => "1"}).pattern
  #=> "http://example.com/1/{two}/"

  Addressable::Template.new(
    "http://example.com/search/{-list|+|query}/"
  ).partial_expand(
    {"query" => "an example search query".split(" ")}
  ).pattern
  #=> "http://example.com/search/an+example+search+query/"

  Addressable::Template.new(
    "http://example.com/{-join|&|one,two}/"
  ).partial_expand({"one" => "1"}).pattern
  #=> "http://example.com/?one=1{-prefix|&two=|two}"

  Addressable::Template.new(
    "http://example.com/{-join|&|one,two,three}/"
  ).partial_expand({"one" => "1", "three" => 3}).pattern
  #=> "http://example.com/?one=1{-prefix|&two=|two}&three=3"

Returns a mapping of variables to their default values specified in the template. Variables without defaults are not returned.

@return [Hash] Mapping of template variables to their defaults

Returns an Array of variables used within the template pattern. The variables are listed in the Array in the order they appear within the pattern. Multiple occurrences of a variable within a pattern are not represented in this Array.

@return [Array] The variables present in the template‘s pattern.

[Validate]