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Contents
require 'spec_helper'
module NotPredicateSpec
describe "A !-predicated terminal symbol" do
testing_expression '!"foo"'
it "fails to parse input matching the terminal symbol" do
parse('foo').should be_nil
end
end
describe "A sequence of a terminal and an and another !-predicated terminal" do
testing_expression '"foo" !"bar"'
it "fails to match input matching both terminals" do
parse('foobar').should be_nil
end
it "successfully parses input matching the first terminal and not the second, reporting the parse failure of the second terminal" do
parse('foo') do |result|
result.should_not be_nil
terminal_failures = parser.terminal_failures
terminal_failures.size.should == 1
failure = terminal_failures.first
failure.index.should == 3
failure.expected_string.should == 'bar'
end
end
end
describe "A !-predicated sequence" do
testing_expression '!("a" "b" "c")'
it "fails to parse matching input" do
parse('abc').should be_nil
end
end
end
Version data entries
251 entries across 206 versions & 31 rubygems