move expr into its own package, make basic main

expr/expr.go

@@ -1,4 +1,4 @@
-package ginger
+package expr
 
 import (
 	"fmt"
@@ -272,6 +272,24 @@ func sliceEnclosedToks(toks []lexer.Token, start, end lexer.Token) ([]lexer.Toke
 	}
 }
 
+func Parse(r io.Reader) ([]Expr, error) {
+	toks := readAllToks(r)
+	var ret []Expr
+	var expr Expr
+	var err error
+	for len(toks) > 0 {
+		if toks[0].TokenType == lexer.EOF {
+			return ret, nil
+		}
+		expr, toks, err = parse(toks)
+		if err != nil {
+			return nil, err
+		}
+		ret = append(ret, expr)
+	}
+	return ret, nil
+}
+
 func readAllToks(r io.Reader) []lexer.Token {
 	l := lexer.New(r)
 	var toks []lexer.Token

expr/expr_test.go

@@ -1,4 +1,4 @@
-package ginger
+package expr
 
 import (
 	. "testing"

main.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/mediocregopher/ginger/expr"
+)
+
+func main() {
+	ee, err := expr.Parse(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+	for _, e := range ee {
+		fmt.Println(e)
+	}
+}