107 lines
3.5 KiB
Go
107 lines
3.5 KiB
Go
package parse
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import (
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"git.makaay.nl/mauricem/go-parsekit/parse"
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"git.makaay.nl/mauricem/go-toml/ast"
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)
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// The primary building block of a TOML document is the table.
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// Tables are filled with key/value pairs.
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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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// Blank 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(whitespace, a.Equal, 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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//
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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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isBareKeyRune = func(b byte) bool {
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return ((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') ||
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(b >= '0' && b <= '9') || b == '_' || b == '-')
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}
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bareKeyRune = a.ByteByCallback(isBareKeyRune)
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bareKey = c.OneOrMore(bareKeyRune)
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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(whitespace, a.Dot, whitespace)
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)
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func (t *parser) startKeyValuePair(p *parse.API) {
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key, ok := t.parseKey(p, ast.NewKey())
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if ok && p.Handle(t.startAssignment) {
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if value, ok := t.parseValue(p); ok {
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err := t.doc.SetKeyValuePair(key, value)
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if err != nil {
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p.SetError("%s", err)
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} else if !p.Accept(endOfLineOrComment) {
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p.Expected("end of line")
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}
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}
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}
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}
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// Bare keys may only contain ASCII letters, ASCII digits, underscores, and
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// dashes (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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//
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// Quoted keys follow the exact same rules as either basic strings or literal
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// strings and allow you to use a much broader set of key names. Best practice
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// 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 (though
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// discouraged).
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func (t *parser) parseKey(p *parse.API, key ast.Key) (ast.Key, bool) {
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var keyPart string
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var ok bool
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switch {
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case p.Accept(bareKey):
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keyPart, ok = p.Result.String(), true
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case p.Peek(a.SingleQuote):
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keyPart, ok = t.parseLiteralString("key", p)
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case p.Peek(a.DoubleQuote):
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keyPart, ok = t.parseBasicString("key", p)
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default:
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p.Expected("a key name")
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return nil, false
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}
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if !ok {
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return nil, false
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}
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key = append(key, keyPart)
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return t.parseEndOfKeyOrDot(p, key)
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}
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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.
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// Whitespace around dot-separated parts is ignored, however, best
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// practice is to not use any extraneous whitespace.
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func (t *parser) parseEndOfKeyOrDot(p *parse.API, key ast.Key) (ast.Key, bool) {
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if p.Accept(keySeparatorDot) {
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return t.parseKey(p, key)
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}
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return key, true
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}
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func (t *parser) startAssignment(p *parse.API) {
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if !p.Accept(keyAssignment) {
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p.Expected("a value assignment")
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}
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}
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