388 lines
9.9 KiB
Ruby
388 lines
9.9 KiB
Ruby
module CodeRay
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# = Tokens
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#
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# The Tokens class represents a list of tokens returnd from
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# a Scanner.
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#
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# A token is not a special object, just a two-element Array
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# consisting of
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# * the _token_ _kind_ (a Symbol representing the type of the token)
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# * the _token_ _text_ (the original source of the token in a String)
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#
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# A token looks like this:
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#
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# [:comment, '# It looks like this']
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# [:float, '3.1415926']
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# [:error, '$^']
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#
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# Some scanners also yield some kind of sub-tokens, represented by special
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# token texts, namely :open and :close .
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#
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# The Ruby scanner, for example, splits "a string" into:
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#
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# [
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# [:open, :string],
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# [:delimiter, '"'],
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# [:content, 'a string'],
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# [:delimiter, '"'],
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# [:close, :string]
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# ]
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#
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# Tokens is also the interface between Scanners and Encoders:
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# The input is split and saved into a Tokens object. The Encoder
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# then builds the output from this object.
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#
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# Thus, the syntax below becomes clear:
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#
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# CodeRay.scan('price = 2.59', :ruby).html
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# # the Tokens object is here -------^
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#
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# See how small it is? ;)
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#
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# Tokens gives you the power to handle pre-scanned code very easily:
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# You can convert it to a webpage, a YAML file, or dump it into a gzip'ed string
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# that you put in your DB.
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#
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# Tokens' subclass TokenStream allows streaming to save memory.
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class Tokens < Array
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# The Scanner instance that created the tokens.
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attr_accessor :scanner
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# Whether the object is a TokenStream.
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#
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# Returns false.
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def stream?
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false
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end
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# Iterates over all tokens.
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#
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# If a filter is given, only tokens of that kind are yielded.
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def each kind_filter = nil, &block
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unless kind_filter
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super(&block)
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else
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super() do |text, kind|
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next unless kind == kind_filter
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yield text, kind
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end
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end
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end
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# Iterates over all text tokens.
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# Range tokens like [:open, :string] are left out.
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#
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# Example:
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# tokens.each_text_token { |text, kind| text.replace html_escape(text) }
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def each_text_token
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each do |text, kind|
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next unless text.is_a? ::String
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yield text, kind
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end
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end
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# Encode the tokens using encoder.
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#
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# encoder can be
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# * a symbol like :html oder :statistic
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# * an Encoder class
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# * an Encoder object
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#
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# options are passed to the encoder.
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def encode encoder, options = {}
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unless encoder.is_a? Encoders::Encoder
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unless encoder.is_a? Class
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encoder_class = Encoders[encoder]
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end
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encoder = encoder_class.new options
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end
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encoder.encode_tokens self, options
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end
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# Turn into a string using Encoders::Text.
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#
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# +options+ are passed to the encoder if given.
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def to_s options = {}
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encode :text, options
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end
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# Redirects unknown methods to encoder calls.
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#
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# For example, if you call +tokens.html+, the HTML encoder
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# is used to highlight the tokens.
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def method_missing meth, options = {}
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Encoders[meth].new(options).encode_tokens self
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end
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# Returns the tokens compressed by joining consecutive
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# tokens of the same kind.
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#
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# This can not be undone, but should yield the same output
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# in most Encoders. It basically makes the output smaller.
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#
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# Combined with dump, it saves space for the cost of time.
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#
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# If the scanner is written carefully, this is not required -
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# for example, consecutive //-comment lines could already be
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# joined in one comment token by the Scanner.
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def optimize
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last_kind = last_text = nil
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new = self.class.new
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for text, kind in self
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if text.is_a? String
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if kind == last_kind
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last_text << text
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else
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new << [last_text, last_kind] if last_kind
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last_text = text
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last_kind = kind
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end
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else
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new << [last_text, last_kind] if last_kind
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last_kind = last_text = nil
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new << [text, kind]
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end
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end
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new << [last_text, last_kind] if last_kind
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new
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end
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# Compact the object itself; see optimize.
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def optimize!
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replace optimize
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end
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# Ensure that all :open tokens have a correspondent :close one.
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#
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# TODO: Test this!
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def fix
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tokens = self.class.new
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# Check token nesting using a stack of kinds.
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opened = []
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for type, kind in self
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case type
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when :open
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opened.push [:close, kind]
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when :begin_line
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opened.push [:end_line, kind]
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when :close, :end_line
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expected = opened.pop
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if [type, kind] != expected
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# Unexpected :close; decide what to do based on the kind:
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# - token was never opened: delete the :close (just skip it)
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next unless opened.rindex expected
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# - token was opened earlier: also close tokens in between
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tokens << token until (token = opened.pop) == expected
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end
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end
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tokens << [type, kind]
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end
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# Close remaining opened tokens
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tokens << token while token = opened.pop
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tokens
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end
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def fix!
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replace fix
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end
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# TODO: Scanner#split_into_lines
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#
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# Makes sure that:
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# - newlines are single tokens
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# (which means all other token are single-line)
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# - there are no open tokens at the end the line
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#
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# This makes it simple for encoders that work line-oriented,
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# like HTML with list-style numeration.
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def split_into_lines
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raise NotImplementedError
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end
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def split_into_lines!
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replace split_into_lines
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end
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# Dumps the object into a String that can be saved
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# in files or databases.
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#
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# The dump is created with Marshal.dump;
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# In addition, it is gzipped using GZip.gzip.
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#
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# The returned String object includes Undumping
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# so it has an #undump method. See Tokens.load.
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#
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# You can configure the level of compression,
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# but the default value 7 should be what you want
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# in most cases as it is a good compromise between
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# speed and compression rate.
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#
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# See GZip module.
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def dump gzip_level = 7
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require 'coderay/helpers/gzip_simple'
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dump = Marshal.dump self
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dump = dump.gzip gzip_level
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dump.extend Undumping
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end
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# The total size of the tokens.
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# Should be equal to the input size before
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# scanning.
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def text_size
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size = 0
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each_text_token do |t, k|
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size + t.size
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end
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size
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end
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# The total size of the tokens.
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# Should be equal to the input size before
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# scanning.
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def text
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map { |t, k| t if t.is_a? ::String }.join
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end
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# Include this module to give an object an #undump
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# method.
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#
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# The string returned by Tokens.dump includes Undumping.
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module Undumping
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# Calls Tokens.load with itself.
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def undump
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Tokens.load self
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end
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end
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# Undump the object using Marshal.load, then
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# unzip it using GZip.gunzip.
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#
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# The result is commonly a Tokens object, but
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# this is not guaranteed.
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def Tokens.load dump
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require 'coderay/helpers/gzip_simple'
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dump = dump.gunzip
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@dump = Marshal.load dump
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end
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end
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# = TokenStream
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#
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# The TokenStream class is a fake Array without elements.
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#
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# It redirects the method << to a block given at creation.
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#
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# This allows scanners and Encoders to use streaming (no
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# tokens are saved, the input is highlighted the same time it
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# is scanned) with the same code.
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#
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# See CodeRay.encode_stream and CodeRay.scan_stream
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class TokenStream < Tokens
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# Whether the object is a TokenStream.
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#
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# Returns true.
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def stream?
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true
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end
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# The Array is empty, but size counts the tokens given by <<.
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attr_reader :size
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# Creates a new TokenStream that calls +block+ whenever
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# its << method is called.
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#
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# Example:
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#
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# require 'coderay'
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#
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# token_stream = CodeRay::TokenStream.new do |kind, text|
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# puts 'kind: %s, text size: %d.' % [kind, text.size]
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# end
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#
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# token_stream << [:regexp, '/\d+/']
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# #-> kind: rexpexp, text size: 5.
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#
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def initialize &block
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raise ArgumentError, 'Block expected for streaming.' unless block
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@callback = block
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@size = 0
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end
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# Calls +block+ with +token+ and increments size.
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#
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# Returns self.
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def << token
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@callback.call(*token)
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@size += 1
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self
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end
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# This method is not implemented due to speed reasons. Use Tokens.
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def text_size
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raise NotImplementedError,
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'This method is not implemented due to speed reasons.'
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end
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# A TokenStream cannot be dumped. Use Tokens.
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def dump
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raise NotImplementedError, 'A TokenStream cannot be dumped.'
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end
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# A TokenStream cannot be optimized. Use Tokens.
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def optimize
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raise NotImplementedError, 'A TokenStream cannot be optimized.'
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end
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end
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end
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if $0 == __FILE__
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$VERBOSE = true
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$: << File.join(File.dirname(__FILE__), '..')
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eval DATA.read, nil, $0, __LINE__ + 4
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end
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__END__
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require 'test/unit'
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class TokensTest < Test::Unit::TestCase
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def test_creation
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assert CodeRay::Tokens < Array
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tokens = nil
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assert_nothing_raised do
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tokens = CodeRay::Tokens.new
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end
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assert_kind_of Array, tokens
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end
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def test_adding_tokens
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tokens = CodeRay::Tokens.new
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assert_nothing_raised do
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tokens << ['string', :type]
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tokens << ['()', :operator]
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end
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assert_equal tokens.size, 2
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end
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def test_dump_undump
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tokens = CodeRay::Tokens.new
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assert_nothing_raised do
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tokens << ['string', :type]
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tokens << ['()', :operator]
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end
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tokens2 = nil
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assert_nothing_raised do
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tokens2 = tokens.dump.undump
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end
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assert_equal tokens, tokens2
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end
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end |