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Versions: 32
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Stored size: 1.19 KB
Contents
require 'stringio'
require_relative 'token'
require_relative 'gherkin_line'
module Gherkin
# The scanner reads a gherkin doc (typically read from a .feature file) and
# creates a token for line. The tokens are passed to the parser, which outputs
# an AST (Abstract Syntax Tree).
#
# If the scanner sees a # language header, it will reconfigure itself dynamically
# to look for Gherkin keywords for the associated language. The keywords are defined
# in gherkin-languages.json.
class TokenScanner
def initialize(source_or_io)
@line_number = 0
case(source_or_io)
when String
@io = StringIO.new(source_or_io)
when StringIO, IO
@io = source_or_io
else
fail ArgumentError, "Please a pass String, StringIO or IO. I got a #{source_or_io.class}"
end
end
def read
location = {line: @line_number += 1}
if @io.nil? || line = @io.gets
gherkin_line = line ? GherkinLine.new(line, location[:line]) : nil
Token.new(gherkin_line, location)
else
@io.close unless @io.closed? # ARGF closes the last file after final gets
@io = nil
Token.new(nil, location)
end
end
end
end
Version data entries
32 entries across 32 versions & 5 rubygems