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Comment:Added parse.Digit and a test
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SHA1: 61937abf4ccfe96754ece2b1a11d628de455e3a7
User & Date: spaskalev on 2015-03-19 20:51:40.908
Other Links: manifest | tags
Context
2015-04-06
19:20
sync tbd check-in: 87e5dc43ff user: spaskalev tags: trunk
2015-03-19
20:51
Added parse.Digit and a test check-in: 61937abf4c user: spaskalev tags: trunk
20:40
Added a test for parse.Defer check-in: b37c997693 user: spaskalev tags: trunk
Changes
Side-by-Side Diff Ignore Whitespace Patch
Modified src/0dev.org/parse/parse.go from [6601f36901] to [bccb31a2c9].
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	return func(s string) (N, string) {
		n, r := accept(s)
		if !n.Matched {
			return n, s
		}
		if n.Content == value {
			return n, r
		}
		return N{Matched: false, Content: "", Nodes: []N{n}}, s
	}
}

// Returns a parser that matches any single digit
// It could have been written as Any(String("0"),String("1"),...,String("9")) as well :)
func Digit() P {
	accept := Accept(1)
	return func(s string) (N, string) {
		n, r := accept(s)
		if !n.Matched {
			return n, s
		}
		if n.Content[0] >= 48 && n.Content[0] <= 57 {
			return n, r
		}
		return N{Matched: false, Content: "", Nodes: []N{n}}, s
	}
}
Modified src/0dev.org/parse/parse_test.go from [eebf67dde7] to [496af272f1].
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	if n, r := s("aa"); !n.Matched || n.Content != "aa" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for String match test", n)
	}
	if n, r := s("ab"); n.Matched || n.Content != "" || n.Nodes == nil || r != "ab" {
		t.Error("Invalid result for String no-match test", n, r, len(r))
	}
}

func TestDigit(t *testing.T) {
	d := Digit()
	if n, r := d("a"); n.Matched || n.Content != "" || n.Nodes == nil || r != "a" {
		t.Error("Invalid result for Digit no-match test", n)
	}
	if n, r := d("1"); !n.Matched || n.Content != "1" || n.Nodes != nil || r != "" {
		t.Error("Invalid result for Digit match test", n)
	}
}
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