added sensors.conf example

Signed-off-by: Tim Henderson <tim.tadh@gmail.com>

examples/sensors/main.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+
+	"github.com/timtadh/getopt"
+	"github.com/timtadh/lexmachine"
+	"github.com/timtadh/lexmachine/machines"
+)
+
+var tokens = []string{
+	"AT", "PLUS", "STAR", "DASH", "SLASH", "BACKSLASH", "CARROT", "BACKTICK", "COMMA", "LPAREN", "RPAREN",
+	"BUS", "COMPUTE", "CHIP", "IGNORE", "LABEL", "SET", "NUMBER", "NAME",
+	"COMMENT", "SPACE",
+}
+var tokmap map[string]int
+var lexer *lexmachine.Lexer
+
+func init() {
+	tokmap = make(map[string]int)
+	for id, name := range tokens {
+		tokmap[name] = id
+	}
+}
+
+func newLexer(dfa bool) *lexmachine.Lexer {
+	getToken := func(tokenType int) lexmachine.Action {
+		return func(s *lexmachine.Scanner, m *machines.Match) (interface{}, error) {
+			return s.Token(tokenType, string(m.Bytes), m), nil
+		}
+	}
+	var lexer = lexmachine.NewLexer()
+	lexer.Add([]byte("@"), getToken(tokmap["AT"]))
+	lexer.Add([]byte(`\+`), getToken(tokmap["PLUS"]))
+	lexer.Add([]byte(`\*`), getToken(tokmap["STAR"]))
+	lexer.Add([]byte("-"), getToken(tokmap["DASH"]))
+	lexer.Add([]byte("/"), getToken(tokmap["SLASH"]))
+	lexer.Add([]byte("\\"), getToken(tokmap["BACKSLASH"]))
+	lexer.Add([]byte(`\^`), getToken(tokmap["CARROT"]))
+	lexer.Add([]byte("`"), getToken(tokmap["BACKTICK"]))
+	lexer.Add([]byte(","), getToken(tokmap["COMMA"]))
+	lexer.Add([]byte(`\(`), getToken(tokmap["LPAREN"]))
+	lexer.Add([]byte(`\)`), getToken(tokmap["RPAREN"]))
+	lexer.Add([]byte("bus"), getToken(tokmap["BUS"]))
+	lexer.Add([]byte("chip"), getToken(tokmap["CHIP"]))
+	lexer.Add([]byte("label"), getToken(tokmap["LABEL"]))
+	lexer.Add([]byte("compute"), getToken(tokmap["COMPUTE"]))
+	lexer.Add([]byte("ignore"), getToken(tokmap["IGNORE"]))
+	lexer.Add([]byte("set"), getToken(tokmap["SET"]))
+	lexer.Add([]byte(`[0-9]*\.?[0-9]+`), getToken(tokmap["NUMBER"]))
+	lexer.Add([]byte(`[a-zA-Z_][a-zA-Z0-9_]*`), getToken(tokmap["NAME"]))
+	lexer.Add([]byte(`"[^"]*"`), getToken(tokmap["NAME"]))
+	lexer.Add([]byte(`#[^\n]*`), getToken(tokmap["COMMENT"]))
+	lexer.Add([]byte(`\s+`), getToken(tokmap["SPACE"]))
+	var err error
+	if dfa {
+		err = lexer.CompileDFA()
+	} else {
+		err = lexer.CompileNFA()
+	}
+	if err != nil {
+		panic(err)
+	}
+	return lexer
+}
+
+func scan(text []byte) error {
+	scanner, err := lexer.Scanner(text)
+	if err != nil {
+		return err
+	}
+	for tk, err, eof := scanner.Next(); !eof; tk, err, eof = scanner.Next() {
+		if ui, is := err.(*machines.UnconsumedInput); ui != nil && is {
+			scanner.TC = ui.FailTC
+			log.Printf("skipping %v", ui)
+		} else if err != nil {
+			return err
+		} else {
+			if false {
+				fmt.Println(tk)
+			}
+		}
+	}
+	return nil
+}
+
+func main() {
+	short := "hdn"
+	long := []string{
+		"help",
+		"dfa",
+		"nfa",
+	}
+
+	_, optargs, err := getopt.GetOpt(os.Args[1:], short, long)
+	if err != nil {
+		log.Print(err)
+		log.Println("help")
+		os.Exit(1)
+	}
+
+	dfa := false
+	for _, oa := range optargs {
+		switch oa.Opt() {
+		case "-h", "--help":
+			fmt.Println("Tokenizes the standard input 1000 times")
+			fmt.Println("Must supply either --nfa or --dfa. try cat /etc/sensors*.conf | sensors --nfa")
+			os.Exit(0)
+		case "-d", "--dfa":
+			dfa = true
+		case "-n", "--nfa":
+			dfa = false
+		}
+	}
+	lexer = newLexer(dfa)
+
+	text, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		log.Fatal(err)
+	}
+	for i := 0; i < 1000; i++ {
+		err = scan(text)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+}