Class: Tokenizer

Inherits:
Object
  • Object
show all
Defined in:
lib/magister_cli/tokenizer.rb

Overview

This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at mozilla.org/MPL/2.0/.

Constant Summary collapse

@@spec = 
[
    [/(\w+)/, "KEYWORD"],
    [/(?:\w+\s?){(.*)}/, "PARAMS"],
    [/(?:\w+\s?(?:{.*}\s?)?)\[(.*)\]/, "OPTIONS"],
    [/(\s+)/, "EMPTY"]
]

Instance Method Summary collapse

Constructor Details

#initialize(string) ⇒ Tokenizer

Returns a new instance of Tokenizer.



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# File 'lib/magister_cli/tokenizer.rb', line 13

def initialize(string)
    @string = string
end

Instance Method Details

#parse_options(optionsString) ⇒ Object 



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# File 'lib/magister_cli/tokenizer.rb', line 17

def parse_options(optionsString)
    cursor = 0
    found = Array.new
    while cursor < optionsString.length
        scope = optionsString[cursor..-1]

        if scope[0] == "{" || scope[0] == "}" || scope[0] == "[" || scope[0] == "]"
            cursor += 1
            next
        end

        whiteSpaceMatch = scope.match /^\s+/
        if whiteSpaceMatch != nil
            cursor += whiteSpaceMatch[0].length
            next
        end

        keywordMatch = scope.match /^\w+\s?:/
        if keywordMatch != nil
            cursor += keywordMatch[0].length
            found.append({"type" => "KEYWORD", "value" => keywordMatch[0][0..-2]})
            next
        end

        explicitString = scope.match /^'([^']*)',*/
        if explicitString != nil
            cursor += explicitString[0].length
            found.append({"type" => "STRING", "value" => explicitString.captures[0]})
            next
        end

        impliedString = scope.match /^(.*?),*/
        if impliedString != nil
            cursor += impliedString[0].length
            found.append({"type" => "STRING", "value" => impliedString.captures[0]})
            next
        end
    end
    parsed = Array.new
    i = 0
    while i < found.length
        if found[i]["type"] != "KEYWORD" || found[i + 1]["type"] != "STRING"
            raise TypeError.new "Expected #{found[i]["value"]} to be a KEYWORD and #{found[i + 1]["value"]} to be a STRING"
        end

        parsed.append({"type" => "PROPERTY", "key" => found[i]["value"], "value" => found[i + 1]["value"]})

        i += 2
    end
    parsed
end

#tokenize ⇒ Object 



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# File 'lib/magister_cli/tokenizer.rb', line 69

def tokenize
    @tokens = Array.new
    @@spec.each do |item|
        matched = @string.match item[0]
        if matched != nil
            matched.captures.each do |match|
                if item[1] == "PARAMS" || item[1] == "OPTIONS"
                    @tokens.append({"type" => item[1], "value" => parse_options(match)})
                elsif item[1] == "EMPTY"
                else
                    @tokens.append({"type" => item[1], "value" => match})
                end
            end
        end
    end
    @tokens
end