A test script for parsing and lexing

Author: ncw

notes.txt

@@ -166,3 +166,11 @@ Introspection idea
 		fmt.Printf("*** method not found\n")
 	}
 
+
+Parser
+======
+
+Use Python's Grammar file - converted into parser/grammar.y
+
+Use go tool yacc and a hand built lexer in parser/lexer.go
+

parser/testparser/testparser.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/ncw/gpython/parser"
+)
+
+var (
+	lex = flag.Bool("l", false, "Lex the file only")
+)
+
+func main() {
+	flag.Parse()
+	for _, path := range flag.Args() {
+		if *lex {
+			fmt.Printf("Lexing %q\n", path)
+		} else {
+			fmt.Printf("Parsing %q\n", path)
+		}
+		in, err := os.Open(path)
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Printf("-----------------\n")
+		if *lex {
+			parser.Lex(in)
+		} else {
+			parser.Parse(in)
+		}
+		fmt.Printf("-----------------\n")
+		in.Close()
+	}
+}