98 lines
1.5 KiB
Ruby
98 lines
1.5 KiB
Ruby
require "fileutils"
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describe Imbecile do
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def write_grammar(grammar)
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File.write("spec/run/testparser.i", grammar)
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end
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def build_parser
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result = system(*%w[./imbecile.sh spec/run/testparser.i spec/run/testparser.d])
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expect(result).to be_truthy
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end
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def compile(test_file)
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result = system(*%w[gdc -funittest -o spec/run/testparser spec/run/testparser.d], test_file)
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expect(result).to be_truthy
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end
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def run
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result = system("spec/run/testparser")
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expect(result).to be_truthy
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end
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before(:each) do
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FileUtils.rm_rf("spec/run")
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FileUtils.mkdir_p("spec/run")
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end
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it "generates a D lexer" do
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write_grammar <<EOF
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token int \\d+
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token plus \\+
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token times \\*
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drop \\s+
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Start: [Foo] <<
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>>
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Foo: [int] <<
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>>
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Foo: [plus] <<
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>>
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EOF
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build_parser
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compile("spec/test_d_lexer.d")
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run
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end
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it "generates a parser" do
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write_grammar <<EOF
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token plus \\+
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token times \\*
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token zero 0
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token one 1
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Start: [E] <<
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>>
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E: [E times B] <<
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>>
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E: [E plus B] <<
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>>
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E: [B] <<
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>>
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B: [zero] <<
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>>
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B: [one] <<
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>>
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EOF
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build_parser
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end
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it "distinguishes between multiple identical rules with lookahead symbol" do
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write_grammar <<EOF
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token a
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token b
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Start: [R1 a] <<
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>>
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Start: [R2 b] <<
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>>
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R1: [a b] <<
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>>
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R2: [a b] <<
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>>
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EOF
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build_parser
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end
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it "handles reducing a rule that could be arrived at from multiple states" do
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write_grammar <<EOF
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token a
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token b
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Start: [a R1] <<
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>>
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Start: [b R1] <<
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>>
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R1: [b] <<
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>>
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EOF
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build_parser
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end
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end
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