1 files changed, 0 insertions, 207 deletions
diff --git a/exprparser.go b/exprparser.go
deleted file mode 100644
index 0d62dbc..0000000
--- a/exprparser.go
+++ /dev/null
@@ -1,207 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"bytes"
-	"io"
-)
-
-type Token int
-
-const eof = rune(0)
-
-const (
-	ILLEGAL Token = iota
-	EOF
-	WS
-
-	IDENT
-
-	ASTERISK
-	COMMA
-	SEMICOLON
-	GT
-	LT
-	GET
-	LET
-	EQ
-	PLUS
-	MINUS
-	DIVISION
-	R_PAREN
-	L_PAREN
-	PERIOD
-)
-
-type Scanner struct {
-	r *bufio.Reader
-}
-
-func newScanner(r io.Reader) *Scanner {
-	return &Scanner{r: bufio.NewReader(r)}
-}
-
-func (s *Scanner) read() rune {
-	ch, _, err := s.r.ReadRune()
-	if err != nil {
-		return eof
-	}
-
-	return ch
-}
-
-func isWhiteSpace(ch rune) bool {
-	if ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r' {
-		return true
-	}
-	return false
-}
-
-func isLetter(ch rune) bool {
-	if (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') {
-		return true
-	}
-	return false
-}
-
-func isDigit(ch rune) bool {
-	if ch >= '0' && ch <= '9' {
-		return true
-	}
-	return false
-}
-
-func isNumber(chs []rune) bool {
-	var dotCounter int
-	for i := range chs {
-		if chs[i] == '.' {
-			dotCounter++
-			if dotCounter > 1 {
-				return false
-			}
-			continue
-		}
-
-		if !isDigit(chs[i]) {
-			return false
-		}
-	}
-
-	return true
-}
-
-func (s *Scanner) unread() { _ = s.r.UnreadRune() }
-
-func (s *Scanner) scanWhitespace() (tok Token, lit string) {
-	var buf bytes.Buffer
-	buf.WriteRune(s.read())
-
-	for {
-		if ch := s.read(); ch == eof {
-			break
-		} else if !isWhiteSpace(ch) {
-			s.unread()
-			break
-		} else {
-			buf.WriteRune(ch)
-		}
-	}
-
-	return WS, buf.String()
-}
-
-func (s *Scanner) scanIdent() (tok Token, lit string) {
-	var buf bytes.Buffer
-	buf.WriteRune(s.read())
-
-	for {
-		if ch := s.read(); ch == eof {
-			break
-		} else if !isLetter(ch) && !isDigit(ch) && ch != '_' {
-			s.unread()
-			break
-		} else {
-			_, _ = buf.WriteRune(ch)
-		}
-	}
-
-	return IDENT, buf.String()
-}
-
-func (s *Scanner) scan() (tok Token, lit string) {
-	ch := s.read()
-
-	if isWhiteSpace(ch) {
-		s.unread()
-		return s.scanWhitespace()
-	} else if isLetter(ch) {
-		s.unread()
-		return s.scanIdent()
-	}
-
-	switch ch {
-	case eof:
-		return EOF, string(ch)
-	case '*':
-		return ASTERISK, string(ch)
-	case '+':
-		return PLUS, string(ch)
-	case '-':
-		return MINUS, string(ch)
-	case '/':
-		return ASTERISK, string(ch)
-	case '(':
-		return R_PAREN, string(ch)
-	case ')':
-		return L_PAREN, string(ch)
-	case ',':
-		return ASTERISK, string(ch)
-	case ';':
-		return ASTERISK, string(ch)
-	case '<':
-		return LT, string(ch)
-	case '>':
-		return GT, string(ch)
-	case '.':
-		return PERIOD, string(ch)
-	}
-
-	return ILLEGAL, string(ch)
-}
-
-type Parser struct {
-	s   *Scanner
-	buf struct {
-		tok Token
-		lit string
-		n   int
-	}
-}
-
-func newParser(r io.Reader) *Parser {
-	return &Parser{s: newScanner(r)}
-}
-
-func (p *Parser) scan() (tok Token, lit string) {
-	if p.buf.n != 0 {
-		p.buf.n = 0
-		return p.buf.tok, p.buf.lit
-	}
-
-	tok, lit = p.s.scan()
-	p.buf.tok, p.buf.lit = tok, lit
-
-	return
-}
-
-func (p *Parser) unscan() { p.buf.n = 1 }
-
-type ASTNode struct {
-	isIdentifier bool
-	isLiteral    bool
-	isIllegal    bool
-	isEOF        bool
-	isWS         bool
-	children     []*ASTNode
-	value        interface{}
-}