81 lines
2.6 KiB
Go
81 lines
2.6 KiB
Go
package parser
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import "git.makaay.nl/mauricem/go-parsekit"
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// The primary building block of a TOML document is the key/value pair.
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var (
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// Keys are on the left of the equals sign and values are on the right.
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// Whitespace is ignored around key names and values. The key, equals
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// sign, and value must be on the same line (though some values can be
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// broken over multiple lines).
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keyAssignment = c.Seq(c.Opt(a.Whitespace), a.Equal, c.Opt(a.Whitespace))
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// A key may be either bare, quoted or dotted. Bare keys may only
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// contain ASCII letters, ASCII digits, underscores, and dashes
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// (A-Za-z0-9_-). Note that bare keys are allowed to be composed of only
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// ASCII digits, e.g. 1234, but are always interpreted as strings.
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bareKeyRune = c.Any(a.ASCIILower, a.ASCIIUpper, a.Digit, a.Underscore, a.Minus)
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bareKey = c.OneOrMore(bareKeyRune)
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// Quoted keys follow the exact same rules as either basic strings or
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// literal strings and allow you to use a much broader set of key names.
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// Best practice is to use bare keys except when absolutely necessary.
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// A bare key must be non-empty, but an empty quoted key is allowed
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// (though discouraged).
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startOfKey = c.Any(bareKeyRune, a.SingleQuote, a.DoubleQuote)
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// Dotted keys are a sequence of bare or quoted keys joined with a dot.
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// This allows for grouping similar properties together. Whitespace
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// around dot-separated parts is ignored, however, best practice is to
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// not use any extraneous whitespace.
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keySeparatorDot = c.Seq(c.Opt(a.Whitespace), a.Dot, c.Opt(a.Whitespace))
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)
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func startKeyValuePair(p *parsekit.P) {
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switch {
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case p.On(a.WhitespaceAndNewlines).Skip().RouteRepeat().End():
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case p.On(a.Hash).RouteTo(startComment).ThenReturnHere().End():
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case p.On(startOfKey).RouteTo(startKey).End():
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default:
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p.ExpectEndOfFile()
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}
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}
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func startKey(p *parsekit.P) {
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p.Expects("a key name")
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p.On(bareKeyRune).RouteTo(startBareKey)
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}
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func startBareKey(p *parsekit.P) {
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p.Expects("a bare key name")
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if p.On(bareKey).Accept().End() {
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p.EmitLiteral(ItemKey)
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p.RouteTo(endOfKeyOrDot)
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}
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}
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func endOfKeyOrDot(p *parsekit.P) {
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if p.On(keySeparatorDot).Skip().End() {
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p.Emit(ItemKeyDot, ".")
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p.RouteTo(startKey)
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} else {
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p.RouteTo(startAssignment)
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}
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}
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func startAssignment(p *parsekit.P) {
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p.Expects("a value assignment")
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if p.On(keyAssignment).Skip().End() {
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p.Emit(ItemAssignment, "=")
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p.RouteTo(startValue)
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}
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}
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// Values must be of the following types: String, Integer, Float, Boolean,
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// Datetime, Array, or Inline Table. Unspecified values are invalid.
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func startValue(p *parsekit.P) {
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p.Expects("a value")
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p.On(c.Any(a.SingleQuote, a.DoubleQuote)).RouteTo(startString)
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}
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