Class: Mustermann::Concat

Inherits:
Composite show all
Defined in:
lib/mustermann/concat.rb

Overview

Class for pattern objects that are a concatenation of other patterns.

See Also:

Constant Summary

Constants included from Mustermann

DEFAULT_TYPE

Instance Attribute Summary

Attributes inherited from Composite

#patterns

Attributes inherited from Pattern

#uri_decode

Instance Method Summary collapse

Methods inherited from Composite

#==, #eql?, #hash, new, supported?, #to_s

Methods inherited from Pattern

#+, #==, #=~, #eql?, #hash, #named_captures, #names, new, #peek, supported?, supported_options, #to_proc, #to_s, #|

Methods included from Mustermann

[], new

Instance Method Details

#===(string) ⇒ Object

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# File 'lib/mustermann/concat.rb', line 44

def ===(string)
  peek_size(string) == string.size
end

#expand(behavior = nil, values = {}) ⇒ String

Note:

This method is only implemented by certain subclasses.

Expanding is supported by almost all patterns (notable execptions are Shell, Regular and Simple).

Union Mustermann::Composite patterns (with the | operator) support expanding if all patterns they are composed of also support it.

Examples:

Expanding a pattern

pattern = Mustermann.new('/:name(.:ext)?')
pattern.expand(name: 'hello')             # => "/hello"
pattern.expand(name: 'hello', ext: 'png') # => "/hello.png"

Checking if a pattern supports expanding

if pattern.respond_to? :expand
  pattern.expand(name: "foo")
else
  warn "does not support expanding"
end

Parameters:

  • behavior (Symbol) (defaults to: nil) —

    What to do with additional key/value pairs not present in the values hash. Possible options: :raise, :ignore, :append.

  • values (Hash{Symbol: #to_s, Array<#to_s>}) (defaults to: {}) —

    Values to use for expansion.

Returns:

  • (String) —

    expanded string

Raises:

  • (NotImplementedError) —

    raised if expand is not supported.

  • (Mustermann::ExpandError) —

    raised if a value is missing or unknown

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# File 'lib/mustermann/concat.rb', line 79

def expand(behavior = nil, values = {})
  raise NotImplementedError, 'expanding not supported' unless respond_to? :expand
  @expander ||= Mustermann::Expander.new(self) { combined_ast }
  @expander.expand(behavior, values)
end

#match(string) ⇒ Object

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# File 'lib/mustermann/concat.rb', line 49

def match(string)
  peeked = peek_match(string)
  peeked if peeked.to_s == string
end

#operator ⇒ Symbol

Returns always :+.

Returns:

  • (Symbol) —

    always :+

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# File 'lib/mustermann/concat.rb', line 39

def operator
  :+
end

#params(string) ⇒ Object

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# File 'lib/mustermann/concat.rb', line 55

def params(string)
  params, size = peek_params(string)
  params if size == string.size
end

#peek_match(string) ⇒ Object

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# File 'lib/mustermann/concat.rb', line 66

def peek_match(string)
  pump(string, initial: SimpleMatch.new) do |pattern, substring|
    return unless match = pattern.peek_match(substring)
    [match, match.to_s.size]
  end
end

#peek_params(string) ⇒ Object

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# File 'lib/mustermann/concat.rb', line 74

def peek_params(string)
  pump(string, inject_with: :merge, with_size: true) { |p, s| p.peek_params(s) }
end

#peek_size(string) ⇒ Object

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# File 'lib/mustermann/concat.rb', line 61

def peek_size(string)
  pump(string) { |p,s| p.peek_size(s) }
end

#to_templates ⇒ Array<String>

Note:

This method is only implemented by certain subclasses.

Generates a list of URI template strings representing the pattern.

Note that this transformation is lossy and the strings matching these templates might not match the pattern (and vice versa).

This comes in quite handy since URI templates are not made for pattern matching. That way you can easily use a more precise template syntax and have it automatically generate hypermedia links for you.

Template generation is supported by almost all patterns (notable exceptions are Shell, Regular and Simple). Union Mustermann::Composite patterns (with the | operator) support template generation if all patterns they are composed of also support it.

Examples:

generating templates

Mustermann.new("/:name").to_templates                   # => ["/{name}"]
Mustermann.new("/:foo(@:bar)?/*baz").to_templates       # => ["/{foo}@{bar}/{+baz}", "/{foo}/{+baz}"]
Mustermann.new("/{name}", type: :template).to_templates # => ["/{name}"]

generating templates from composite patterns

pattern  = Mustermann.new('/:name')
pattern |= Mustermann.new('/{name}', type: :template)
pattern |= Mustermann.new('/example/*nested')
pattern.to_templates # => ["/{name}", "/example/{+nested}"]

Checking if a pattern supports expanding

if pattern.respond_to? :to_templates
  pattern.to_templates
else
  warn "does not support template generation"
end

Returns:

  • (Array<String>) —

    list of URI templates



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# File 'lib/mustermann/concat.rb', line 86

def to_templates
  raise NotImplementedError, 'template generation not supported' unless respond_to? :to_templates
  @to_templates ||= patterns.inject(['']) { |list, pattern| list.product(pattern.to_templates).map(&:join) }.uniq
end