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require "../spec_helper"
include Parcom
# defining my own JSON alias in case of strange interactions
# with the built-in type
alias JSONValue = Nil \
| Bool \
| Int64 \
| Float64 \
| String \
| Array(JSONValue) \
| Hash(String, JSONValue)
def json_null
Parser.token_sequence("null".chars).map { |_| nil.as(JSONValue) }
end
def json_value : Parser(Char, JSONValue)
Parser.first_of([
json_null,
])
end
describe "example: JSON parsing" do
describe "json_null" do
it "parses the string 'null' and returns nil when successful" do
result = json_null.parse(Tokens.from_string("null"))
result.value.should be_nil
result.tokens.empty?.should be_true
expect_raises(ParserFail) { json_null.parse(Tokens.from_string("")) }
end
end
describe "json_value" do
it "parses null" do
result = json_value.parse(Tokens.from_string("null"))
result.value.should be_nil
result.tokens.empty?.should be_true
end
end
end
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