Implemented all number formats for TOML.

toml.go

@@ -20,6 +20,8 @@ const (
 	cAssign              = "assign"  // assign a value
 	csetStrVal           = "string"  // set a string value
 	csetIntVal           = "integer" // set an integer value
+	csetFloatVal         = "float"   // set a float value
+	csetBoolVal          = "boolean" // set a boolean value
 )
 
 type parser struct {

value_number.go

@@ -12,7 +12,7 @@ var (
 	// numbers, you may use underscores between digits to enhance readability.
 	// Each underscore must be surrounded by at least one digit on each side.
 	// Leading zeros are not allowed.
-	integerPrefix    = a.Signed(a.DigitNotZero.Then(a.Digits.Optional()))
+	integerPrefix    = a.Signed(a.DigitNotZero.Then(a.Digits.Optional())).Or(a.Signed(zero))
 	underscoreDigits = m.Drop(a.Underscore).Then(a.Digits)
 	integerSuffix    = c.ZeroOrMore(underscoreDigits)
 	integer          = integerPrefix.Then(integerSuffix)
@@ -39,18 +39,50 @@ var (
 	binaryDigits           = c.OneOrMore(a.RuneRange('0', '1'))
 	underscoreBinaryDigits = m.Drop(a.Underscore).Then(binaryDigits)
 	binary                 = a.Rune('b').Then(tok.Str("b", binaryDigits.Then(c.ZeroOrMore(underscoreBinaryDigits))))
+
+	// A fractional part is a decimal point followed by one or more digits.
+	// Similar to integers, you may use underscores to enhance readability.
+	// Each underscore must be surrounded by at least one digit.
+	fractionalPart = a.Dot.Then(a.Digits).Then(c.ZeroOrMore(underscoreDigits))
+
+	// An exponent part is an E (upper or lower case) followed by an integer
+	// part (which follows the same rules as decimal integer values).
+	exponentPart = a.Runes('e', 'E').Then(integer)
+
+	// Floats should be implemented as IEEE 754 binary64 values.
+	// A float consists of an integer part (which follows the same rules as
+	// decimal integer values) followed by a fractional part and/or an exponent
+	// part. If both a fractional part and exponent part are present, the
+	// fractional part must precede the exponent part.
+	fractAndOrExp = c.Any(fractionalPart.Then(c.Optional(exponentPart)), exponentPart)
+	float         = integer.Then(fractAndOrExp)
+
+	// Float values -0.0 and +0.0 are valid and should map according to IEEE 754.
+	zeroFloat = a.Signed(a.Str("0.0"))
+
+	// Special float values can also be expressed. They are always lowercase.
+	infinity = a.Signed(a.Str("inf"))
+	nan      = a.Signed(a.Str("nan"))
 )
 
-func (t *parser) startInteger(p *parse.API) {
+func (t *parser) startNumber(p *parse.API) {
 	switch {
+	case p.Accept(float):
+		f, err := strconv.ParseFloat(p.Result().String(), 64)
+		if err != nil {
+			p.Error("Cannot parse value 0%s: %s", p.Result().String(), err)
+		} else {
+			t.emitCommand(csetFloatVal, f)
+		}
+	case p.Accept(zeroFloat):
+		f, _ := strconv.ParseFloat(p.Result().String(), 64)
+		t.emitCommand(csetFloatVal, f)
 	case p.Accept(zero):
 		p.Handle(t.startIntegerStartingWithZero)
-	case p.Accept(plusZero.Or(minusZero)):
-		t.emitCommand(csetIntVal, int64(0))
 	case p.Accept(tok.Int64(nil, integer)):
 		t.emitCommand(csetIntVal, p.Result().Value(0).(int64))
 	default:
-		p.Expected("an integer value")
+		p.Expected("a number")
 	}
 }
 

value_number_test.go

@@ -6,7 +6,7 @@ import (
 
 func TestInteger(t *testing.T) {
 	for _, test := range []parseTest{
-		{``, []string{`Error: unexpected end of file (expected an integer value) at start of file`}},
+		{``, []string{`Error: unexpected end of file (expected a number) at start of file`}},
 		// Decimal
 		{`0`, []string{`integer(0)`}},
 		{`+0`, []string{`integer(0)`}},
@@ -16,7 +16,7 @@ func TestInteger(t *testing.T) {
 		{`+99`, []string{`integer(99)`}},
 		{`-17`, []string{`integer(-17)`}},
 		{`1234`, []string{`integer(1234)`}},
-		{`_`, []string{`Error: unexpected input (expected an integer value) at start of file`}},
+		{`_`, []string{`Error: unexpected input (expected a number) at start of file`}},
 		{`1_`, []string{`integer(1)`, `Error: unexpected input (expected end of file) at line 1, column 2`}},
 		{`1_000`, []string{`integer(1000)`}},
 		{`5_349_221`, []string{`integer(5349221)`}},
@@ -75,6 +75,27 @@ func TestInteger(t *testing.T) {
 				`value out of range at line 1, column 74`}},
 	} {
 		p := &parser{}
-		testParseHandler(t, p, p.startInteger, test)
+		testParseHandler(t, p, p.startNumber, test)
+	}
+}
+
+func TestFloat(t *testing.T) {
+	for _, test := range []parseTest{
+		{``, []string{`Error: unexpected end of file (expected a number) at start of file`}},
+		{`0.0`, []string{`float(0)`}},
+		{`+0.0`, []string{`float(0)`}},
+		{`-0.0`, []string{`float(-0)`}},
+		{`+1.0`, []string{`float(1)`}},
+		{`3.1415`, []string{`float(3.1415)`}},
+		{`-0.01`, []string{`float(-0.01)`}},
+		{`5e+22`, []string{`float(5e+22)`}},
+		{`1E6`, []string{`float(1e+06)`}},
+		{`-2E-2`, []string{`float(-0.02)`}},
+		{`6.626e-34`, []string{`float(6.626e-34)`}},
+		{`224_617.445_991_228`, []string{`float(224617.445991228)`}},
+		{`12_345.111_222e+1_2_3`, []string{`float(1.2345111222e+127)`}},
+	} {
+		p := &parser{}
+		testParseHandler(t, p, p.startNumber, test)
 	}
 }