reorganize: x-tba

x-tba/2-methods/xxx-project-file-parser/parser.go

@@ -96,7 +96,7 @@ func (p *parser) parse(line string) (dom domain, err error) {
 	fields := strings.Fields(line)
 	if len(fields) != 2 {
 		err = fmt.Errorf("wrong input: %v (line #%d)", fields, p.lines)
-		return dom, err
+		return
 	}
 
 	name, visits := fields[0], fields[1]
@@ -104,7 +104,7 @@ func (p *parser) parse(line string) (dom domain, err error) {
 	n, err := strconv.Atoi(visits)
 	if n < 0 || err != nil {
 		err = fmt.Errorf("wrong input: %q (line #%d)", visits, p.lines)
-		return dom, err
+		return
 	}
 
 	return domain{name: name, visits: n}, nil

x-tba/6-methods/xxx-project-file-parser/01-funcs/main.go

@@ -1,70 +0,0 @@
-// For more tutorials: https://blog.learngoprogramming.com
-//
-// Copyright © 2018 Inanc Gumus
-// Learn Go Programming Course
-// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
-//
-
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-)
-
-func main() {
-	in := bufio.NewScanner(os.Stdin)
-
-	p := newParser()
-	for in.Scan() {
-		// dom, err := parse(p, in.Text())
-		// if err != nil {
-		// 	fmt.Println(err)
-		// 	return
-		// }
-
-		// p = push(p, dom)
-
-		p = add(p, in.Text())
-	}
-
-	summarize(p)
-	dumpErrs(in.Err(), err(p))
-}
-
-// funcs not always need to be reused.
-// here, it tells about what it does: it summarizes the parsing result.
-func summarize(p parser) {
-	// multiple iterators can be created. each one remembers the last
-	// read domain record.
-	next, cur := iterator(p)
-	for next() {
-		dom := cur()
-		fmt.Printf("%-25s -> %d\n", dom.name, dom.visits)
-	}
-	fmt.Printf("\n%-25s -> %d\n", "TOTAL", p.total)
-}
-
-// // funcs not always need to be reused.
-// // here, it tells about what it does: it summarizes the parsing result.
-// func summarize(p parser) {
-// 	// Print the visits per domain
-// 	for _, d := range p.domains {
-// 		vis := p.sum[d.name]
-
-// 		fmt.Printf("%-25s -> %d\n", d.name, vis)
-// 	}
-
-// 	// Print the total visits for all domains
-// 	fmt.Printf("\n%-25s -> %d\n", "TOTAL", p.total)
-// }
-
-// this variadic func simplifies the multiple error handling
-func dumpErrs(errs ...error) {
-	for _, err := range errs {
-		if err != nil {
-			fmt.Printf("> Err: %s\n", err)
-		}
-	}
-}

x-tba/6-methods/xxx-project-file-parser/01-funcs/parser.go

@@ -1,109 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-// domain represents a domain log record
-type domain struct {
-	name   string
-	visits int
-}
-
-// parser parses a log file and provides an iterator to iterate upon the domains
-//
-// the parser struct is carefully crafted to be usable using its zero values except the map field.
-type parser struct {
-	sum     map[string]int // visits per unique domain
-	domains []domain       // unique domain names
-	total   int            // total visits to all domains
-	lines   int            // number of parsed lines (for the error messages)
-	err     error          // saves the last error occurred
-}
-
-// newParser creates and returns a new parser.
-func newParser() parser {
-	return parser{sum: make(map[string]int)}
-}
-
-func add(p parser, line string) parser {
-	// if there was a previous error do not add
-	if p.err != nil {
-		return p
-	}
-
-	p, dom, err := parse(p, line)
-
-	// store only the last error
-	if err != nil {
-		p.err = err
-		return p
-	}
-
-	return push(p, dom)
-}
-
-// iterator returns two functions for iterating over domains.
-// next = returns true when there are more domains to iterate on.
-// cur  = returns the current domain
-//
-// READ METHOD
-func iterator(p parser) (next func() bool, cur func() domain) {
-	// remember the last received line
-	var last int
-
-	next = func() bool {
-		defer func() { last++ }()
-		return len(p.domains) > last
-	}
-
-	cur = func() domain {
-		d := p.domains[last-1]
-		vis := p.sum[d.name]
-
-		// return a copy so the caller cannot change it
-		return domain{name: d.name, visits: vis}
-	}
-
-	return
-}
-
-// error returns the last error occurred
-//
-// READ METHOD
-func err(p parser) error {
-	return p.err
-}
-
-func parse(p parser, line string) (pr parser, dom domain, err error) {
-	p.lines++ // increase the parsed line counter (only write is here)
-
-	fields := strings.Fields(line)
-	if len(fields) != 2 {
-		err = fmt.Errorf("wrong input: %v (line #%d)", fields, p.lines)
-		return p, dom, err
-	}
-
-	name, visits := fields[0], fields[1]
-
-	n, err := strconv.Atoi(visits)
-	if n < 0 || err != nil {
-		err = fmt.Errorf("wrong input: %q (line #%d)", visits, p.lines)
-		return p, dom, err
-	}
-
-	return p, domain{name: name, visits: n}, nil
-}
-
-func push(p parser, d domain) parser {
-	// collect the unique domains
-	if _, ok := p.sum[d.name]; !ok {
-		p.domains = append(p.domains, d)
-	}
-
-	p.sum[d.name] += d.visits
-	p.total += d.visits
-	return p
-}

x-tba/6-methods/xxx-project-file-parser/02-pointers/log.txt

@@ -1,6 +0,0 @@
-learngoprogramming.com 10
-learngoprogramming.com 10
-golang.org 4
-golang.org 6
-blog.golang.org 20
-blog.golang.org 10

x-tba/6-methods/xxx-project-file-parser/02-pointers/main.go

@@ -1,56 +0,0 @@
-// For more tutorials: https://blog.learngoprogramming.com
-//
-// Copyright © 2018 Inanc Gumus
-// Learn Go Programming Course
-// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
-//
-
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-)
-
-func main() {
-	in := bufio.NewScanner(os.Stdin)
-
-	p := newParser()
-	for in.Scan() {
-		// dom, err := parse(p, in.Text())
-		// if err != nil {
-		// 	fmt.Println(err)
-		// 	return
-		// }
-
-		// p = push(p, dom)
-
-		add(p, in.Text())
-	}
-
-	summarize(p)
-	dumpErrs(in.Err(), err(p))
-}
-
-// funcs not always need to be reused.
-// here, it tells about what it does: it summarizes the parsing result.
-func summarize(p *parser) {
-	// multiple iterators can be created. each one remembers the last
-	// read domain record.
-	next, cur := iterator(p)
-	for next() {
-		dom := cur()
-		fmt.Printf("%-25s -> %d\n", dom.name, dom.visits)
-	}
-	fmt.Printf("\n%-25s -> %d\n", "TOTAL", p.total)
-}
-
-// this variadic func simplifies the multiple error handling
-func dumpErrs(errs ...error) {
-	for _, err := range errs {
-		if err != nil {
-			fmt.Printf("> Err: %s\n", err)
-		}
-	}
-}

x-tba/6-methods/xxx-project-file-parser/02-pointers/parser.go

@@ -1,108 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-// domain represents a domain log record
-type domain struct {
-	name   string
-	visits int
-}
-
-// parser parses a log file and provides an iterator to iterate upon the domains
-//
-// the parser struct is carefully crafted to be usable using its zero values except the map field
-type parser struct {
-	sum     map[string]int // visits per unique domain
-	domains []domain       // unique domain names
-	total   int            // total visits to all domains
-	lines   int            // number of parsed lines (for the error messages)
-	err     error          // saves the last error occurred
-}
-
-// newParser creates and returns a new parser.
-func newParser() *parser {
-	return &parser{sum: make(map[string]int)}
-}
-
-func add(p *parser, line string) {
-	// if there was a previous error do not add
-	if p.err != nil {
-		return
-	}
-
-	dom, err := parse(p, line)
-
-	// store only the last error
-	if err != nil {
-		p.err = err
-		return
-	}
-
-	push(p, dom)
-}
-
-// iterator returns two functions for iterating over domains.
-// next = returns true when there are more domains to iterate on.
-// cur  = returns the current domain
-//
-// READ METHOD
-func iterator(p *parser) (next func() bool, cur func() domain) {
-	// remember the last received line
-	var last int
-
-	next = func() bool {
-		defer func() { last++ }()
-		return len(p.domains) > last
-	}
-
-	cur = func() domain {
-		d := p.domains[last-1]
-		vis := p.sum[d.name]
-
-		// return a copy so the caller cannot change it
-		return domain{name: d.name, visits: vis}
-	}
-
-	return
-}
-
-// error returns the last error occurred
-//
-// READ METHOD
-func err(p *parser) error {
-	return p.err
-}
-
-func parse(p *parser, line string) (dom domain, err error) {
-	p.lines++ // increase the parsed line counter (only write is here)
-
-	fields := strings.Fields(line)
-	if len(fields) != 2 {
-		err = fmt.Errorf("wrong input: %v (line #%d)", fields, p.lines)
-		return dom, err
-	}
-
-	name, visits := fields[0], fields[1]
-
-	n, err := strconv.Atoi(visits)
-	if n < 0 || err != nil {
-		err = fmt.Errorf("wrong input: %q (line #%d)", visits, p.lines)
-		return dom, err
-	}
-
-	return domain{name: name, visits: n}, nil
-}
-
-func push(p *parser, d domain) {
-	// collect the unique domains
-	if _, ok := p.sum[d.name]; !ok {
-		p.domains = append(p.domains, d)
-	}
-
-	p.sum[d.name] += d.visits
-	p.total += d.visits
-}

x-tba/6-methods/xxx-project-file-parser/03-methods/log.txt

@@ -1,6 +0,0 @@
-learngoprogramming.com 10
-learngoprogramming.com 10
-golang.org 4
-golang.org 6
-blog.golang.org 20
-blog.golang.org 10