spec/ruby/library/stringscanner/match_spec.rb


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

require_relative '../../spec_helper'
require 'strscan'

describe "StringScanner#match?" do
  before :each do
    @s = StringScanner.new("This is a test")
  end

  it "returns the length of the match and the scan pointer is not advanced" do
    @s.match?(/\w+/).should == 4
    @s.match?(/\w+/).should == 4
    @s.pos.should == 0
  end

  it "returns nil if there's no match" do
    @s.match?(/\d+/).should == nil
    @s.match?(/\s+/).should == nil
  end

  it "effects pre_match" do
    @s.scan(/\w+/)
    @s.scan(/\s/)

    @s.pre_match.should == "This"
    @s.match?(/\w+/)
    @s.pre_match.should == "This "
  end
end