Refactoring

src/compiler/compiler.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"log"
 	"os"
-	"strings"
 )
 
 func main() {
@@ -22,6 +21,10 @@ func main() {
 		fmt.Printf("%s\n", err.Error())	
 		return
 	}
+	log.Println("Lexer output:")
+	for _, el := range tokens {
+		fmt.Print(el.ToString())
+	}
 
 	automata = parserAutomata()
 	err = validateGrammar()
@@ -33,29 +36,9 @@ func main() {
 	if (err != nil) {
 		log.Fatal(err.Error())
 	}
+	log.Println("Parser output:")
 	for _, element := range questions {
-		switch element.(type) {
-		case SingleAnswerQuestion:
-			fmt.Printf(
-				"<Single choice> (%s) %s: %s\n",
-				element.(SingleAnswerQuestion).section,
-				strings.Trim(element.(SingleAnswerQuestion).question, "\t\n "),
-				strings.Trim(element.(SingleAnswerQuestion).answer, "\t\n "),
-			)
-		case MultipleChoiceQuestion:
-			fmt.Printf(
-				"<Multi choice> (%s) %s\n",
-				element.(MultipleChoiceQuestion).section,
-				element.(MultipleChoiceQuestion).question,
-			)
-			for _, el := range element.(MultipleChoiceQuestion).choices {
-				opener := '-'
-				if (el.isCorrect) {
-					opener = '+'
-				}
-				fmt.Printf("\t%c %s\n", opener, strings.Trim(el.answer, "\t\n "))
-			}
-		}
+		fmt.Printf("%s", element.ToString())
 	}
 
 	log.Println("Compilation completed")

src/compiler/lexer.go

@@ -1,16 +1,17 @@
 package main
 
 import (
+	"fmt"
 	"strings"
 )
 
 var tokens []Token
 var buffer []rune
-var	row int32          =     1
-var	column int32       =     1
-var	previousRow int32 =     -1
-var	previousColumn int32 =  -1
-var textStarted bool =   false
+var	row             int32 =     1
+var	column          int32 =     1
+var	previousRow     int32 =    -1
+var	previousColumn  int32 =    -1
+var textStarted     bool  = false
 
 type TokenType int
 
@@ -36,6 +37,27 @@ type Token struct {
 	column          int32;
 } 
 
+
+func (token Token)ToString() string {
+	content := token.content
+	if (token.tokenType == TextFragment) {
+		content = strings.Replace(
+			strings.Trim(content, " "),
+			"\n",
+			"\\n",
+			-1,
+		)
+	}
+	return fmt.Sprintf(
+		"%s: \"%s\" %d:%d\n",
+		ToString(&token.tokenType),
+		content,
+		token.row,
+		token.column,
+	)
+}
+
+
 func makePostTextToken(ttype TokenType, tokenLen int32, textType TokenType) {
 	if (len(strings.Trim(string(buffer), " \n\t")) - 1 > 0) {
 		textFragment := []rune{}

src/compiler/parser.go

@@ -6,7 +6,9 @@ import (
 	"log"
 )
 
-type Question interface {}
+type Question interface {
+	ToString() string;
+}
 
 type SingleAnswerQuestion struct {
 	id string;
@@ -27,6 +29,32 @@ type MultipleChoiceQuestion struct {
 	section string;
 }
 
+func (question SingleAnswerQuestion)ToString() string {
+	return fmt.Sprintf(
+		"<Single choice> (%s) %s: %s\n",
+		question.section,
+		strings.Trim(question.question, "\t\n "),
+		strings.Trim(question.answer, "\t\n "),
+	)
+}
+
+func (question MultipleChoiceQuestion)ToString() string {
+	acc := ""
+	acc += fmt.Sprintf(
+		"<Multi choice> (%s) %s\n",
+		question.section,
+		question.question,
+	)
+	for _, el := range question.choices {
+		opener := '-'
+		if (el.isCorrect) {
+			opener = '+'
+		}
+		acc += fmt.Sprintf("\t%c %s\n", opener, strings.Trim(el.answer, "\t\n "))
+	}
+	return acc
+}
+
 type QuestionElement struct {
 	isDash bool;
 	content string;
@@ -95,31 +123,7 @@ func parserAutomata() map[TokenType][]TokenType {
 func validateGrammar() error {
 	for i := 0; i < len(tokens) - 1; i++ {
 		token := tokens[i]
-		content := token.content
-		if (token.tokenType == TextFragment) {
-			content = strings.Replace(
-				strings.Trim(content, " "),
-				"\n",
-				"\\n",
-				-1,
-			)
-		}
 		nextToken := tokens[i + 1]
-		fmt.Printf(
-			"%s: \"%s\" %d:%d\n",
-			ToString(&token.tokenType),
-			content,
-			token.row,
-			token.column,
-		)
-		if (false) {
-			fmt.Print("Possible next tokens:")
-			for k:=0; k<len(automata[token.tokenType]); k++ {
-				ttype := automata[token.tokenType][k]
-				fmt.Printf(" %s,", ToString(&ttype))
-			}
-			fmt.Print("\n:")
-		}
 		if (!contains(automata[token.tokenType], nextToken.tokenType)) {
 			return CompilerErr{
 				message: fmt.Sprintf(
@@ -215,4 +219,3 @@ func ParseQuestions(tokens []Token) ([]Question, error) {
 	}
 	return questions, nil
 }
-