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

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

lexer/lexer.go

@@ -1,83 +0,0 @@
-// Package lexer provides basic helpers to implement parsers
-package lexer
-
-import "io"
-
-// Lexer adds Accept and AcceptAll support to a
-// [io.RuneScanner]
-type Lexer struct {
-	io.RuneScanner
-}
-
-// 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 (p Lexer) Accept(cond func(rune) bool) bool {
-	return Accept(p, cond)
-}
-
-// 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 (p Lexer) AcceptAll(cond func(rune) bool) bool {
-	return AcceptAll(p, cond)
-}
-
-// NewLexer extends a [io.RuneScanner] with Accept()/AcceptAll()
-// functionality
-func NewLexer(src io.RuneScanner) *Lexer {
-	if src == nil {
-		return nil
-	}
-
-	return &Lexer{src}
-}
-
-// 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
-}
-
-// 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 Accept(src io.RuneScanner, cond func(r rune) bool) bool {
-	r, _, err := src.ReadRune()
-	switch {
-	case err != nil:
-		return false
-	case cond(r):
-		return true
-	default:
-		_ = src.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 AcceptAll(src io.RuneScanner, cond func(r rune) bool) bool {
-	var accepted bool
-
-	for {
-		r, _, err := src.ReadRune()
-		switch {
-		case err != nil:
-			return accepted
-		case cond(r):
-			accepted = true
-		default:
-			_ = src.UnreadRune()
-			return accepted
-		}
-	}
-}

lexer/position.go

@@ -1,68 +0,0 @@
-package lexer
-
-import "fmt"
-
-// Position indicates a line and column pair on a file.
-// Counting starts at 1.
-type Position struct {
-	Line   int
-	Column int
-}
-
-// String generates a pretty "(Line, Column)"" representation of the Position
-func (p Position) String() string {
-	if p.Line == 0 {
-		p.Reset()
-	}
-
-	return fmt.Sprintf("(%v, %v)", p.Line, p.Column)
-}
-
-// GoString generates a string representation of the Position for %#v usage
-func (p Position) GoString() string {
-	if p.Line == 0 {
-		p.Reset()
-	}
-
-	return fmt.Sprintf("lexer.Position{%v, %v}", p.Line, p.Column)
-}
-
-// Reset places a position at (1,1)
-func (p *Position) Reset() {
-	p.Line, p.Column = 1, 1
-}
-
-// Step moves the column one place
-func (p *Position) Step() {
-	if p.Line == 0 {
-		p.Reset()
-	}
-
-	p.Column++
-}
-
-// Next returns a new Position one rune forward
-// on the line
-func (p Position) Next() Position {
-	if p.Line == 0 {
-		p.Reset()
-	}
-
-	return Position{
-		Line:   p.Line,
-		Column: p.Column + 1,
-	}
-}
-
-// NextLine returns a new Position at the begining of the next
-// line.
-func (p Position) NextLine() Position {
-	if p.Line == 0 {
-		p.Reset()
-	}
-
-	return Position{
-		Line:   p.Line + 1,
-		Column: 1,
-	}
-}