parser.Parser: refactor using TextParser

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

parser/parser.go

@@ -1,4 +1,4 @@
-// Package parser parses dosini-style files
+// Package parser parses ini-style files
 package parser
 
 import (
@@ -8,10 +8,9 @@ import (
 	"asciigoat.org/core/lexer"
 )
 
-// Parser parses a dosini-style document
+// Parser parses a ini-style document
 type Parser struct {
-	src *lexer.Reader
-	pos lexer.Position
+	p TextParser
 
 	// OnToken is called for each identified token. if it returns an error
 	// parsing is interrupted.
@@ -51,15 +50,13 @@ func (p *Parser) setDefaults() {
 }
 
 func (p *Parser) emitString(typ TokenType) error {
-	s := p.src.Emit()
-	err := p.OnToken(p.pos, typ, s)
-	p.pos.StepN(len(s))
-
-	return err
+	pos, s := p.p.Emit()
+	return p.OnToken(pos, typ, s)
 }
 
 func (p *Parser) emitError(content string, err error) (lexer.StateFn, error) {
-	err2 := p.OnError(p.pos, content, err)
+	pos := p.p.Position()
+	err2 := p.OnError(pos, content, err)
 	switch {
 	case err2 != nil:
 		// return wrapped error
@@ -77,33 +74,25 @@ func (p *Parser) emitInvalidRune(r rune) (lexer.StateFn, error) {
 // stepLine discards the data and moves the position
 // to the next line.
 func (p *Parser) stepLine() {
-	p.src.Discard()
-	p.pos.StepLine()
-}
-
-// stepRune discards the data and moves the position
-// one rune forward on the same line.
-func (p *Parser) stepRune() {
-	p.src.Discard()
-	p.pos.Step()
+	p.p.StepLine()
 }
 
 // stepString discards the data and moves the position
 // forward on the same line the length of the discarded
 // content.
 func (p *Parser) stepString() {
-	s := p.src.Emit()
-	p.pos.StepN(len(s))
+	p.p.Step()
 }
 
-// NewParser creates a dosini-style parser using
+// NewParser creates a ini-style parser using
 // an [io.Reader] as source
 func NewParser(r io.Reader) *Parser {
-	if r == nil {
-		return nil
+	var p *Parser
+
+	if r != nil {
+		p = new(Parser)
+		p.p.Init(r)
 	}
 
-	return &Parser{
-		src: lexer.NewReader(r),
-	}
+	return p
 }