build-sys: import build system from darvaza.org/core

Signed-off-by: Alejandro Mery <amery@jpi.io>

lexer/lexer.go

@@ -1,17 +1,2 @@
 // Package lexer provides basic helpers to implement parsers
 package lexer
-
-// StateFn is a State Function of the parser
-type StateFn func() (StateFn, error)
-
-// Run runs a state machine until the state function either
-// returns nil or an error
-func Run(fn StateFn) error {
-	var err error
-
-	for fn != nil && err == nil {
-		fn, err = fn()
-	}
-
-	return err
-}

lexer/reader.go

@@ -198,41 +198,6 @@ func (b *Reader) PeekRune() (rune, int, error) {
 	return r, l, err
 }
 
-// Accept consumes a rune from the source if it meets the condition.
-// it returns true if the condition was met and false if it wasn't.
-func (b *Reader) Accept(cond func(r rune) bool) bool {
-	r, _, err := b.ReadRune()
-	switch {
-	case err != nil:
-		return false
-	case cond(r):
-		return true
-	default:
-		_ = b.UnreadRune()
-		return false
-	}
-}
-
-// AcceptAll consumes runes from the source as long as they meet the
-// condition. it returns true if the condition was met for at least one rune,
-// and false if it wasn't.
-func (b *Reader) AcceptAll(cond func(r rune) bool) bool {
-	var accepted bool
-
-	for {
-		r, _, err := b.ReadRune()
-		switch {
-		case err != nil:
-			return accepted
-		case cond(r):
-			accepted = true
-		default:
-			_ = b.UnreadRune()
-			return accepted
-		}
-	}
-}
-
 // NewReader creates a new runes [Reader] using the given [io.Reader]
 func NewReader(r io.Reader) *Reader {
 	if r == nil {