move: log parser

interfaces/log-parser/refactor-notes/refactor-03-deprecated/parser.go

@@ -0,0 +1,40 @@
+// 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
+
+// parser keeps track of the parsing
+type parser struct {
+	sum     map[string]result // metrics per domain
+	domains []string          // unique domain names
+}
+
+// newParser constructs, initializes and returns a new parser
+func newParser() *parser {
+	return &parser{sum: make(map[string]result)}
+}
+
+// parse all the log lines and update the results
+func parse(p *parser) error {
+	process := func(r result) {
+		update(p, r)
+	}
+
+	err := scan(process)
+
+	return err
+}
+
+func update(p *parser, r result) {
+	// Collect the unique domains
+	if _, ok := p.sum[r.domain]; !ok {
+		p.domains = append(p.domains, r.domain)
+	}
+
+	// create and assign a new copy of `visit`
+	p.sum[r.domain] = addResult(r, p.sum[r.domain])
+}