remove: xxx-pointer-with-structs-maps

26-functions-and-pointers/xxx-pointer-with-structs-maps-and-slices/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)
-		}
-	}
-}

26-functions-and-pointers/xxx-pointer-with-structs-maps-and-slices/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)}
-}
-
-// add parses the given line and saves the result to the internal list of
-// domains. it doesn't add the record when the parsing fails.
-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
-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
-func err(p *parser) error {
-	return p.err
-}
-
-// parse parses the given text and returns a domain struct
-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
-	}
-
-	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
-	}
-
-	return domain{name: name, visits: n}, nil
-}
-
-// push pushes the given domain to the internal list of domains.
-// it also increases the total visits for all the domains.
-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
-}