From b6eceb5dcd357082f5d91b74617138a5ad3fc416 Mon Sep 17 00:00:00 2001
From: Gregory Eremin <g@erem.in>
Date: Mon, 16 Feb 2015 20:36:23 +0700
Subject: [PATCH] Parse expectations

---
 parser/parser.go | 57 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 52 insertions(+), 5 deletions(-)

diff --git a/parser/parser.go b/parser/parser.go
index ceca450..a57a99d 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -1,19 +1,66 @@
 package parser
 
 import (
+	"fmt"
+	"strconv"
+	"strings"
+
 	"github.com/localhots/punk/lexer"
 )
 
 type (
+	ExpectationType int
+	Expectation     struct {
+		Type  ExpectationType
+		Key   string
+		Index int64
+	}
 	Parser struct {
-		lex      *lexer.Lexer
-		selector string
+		exps []Expectation
 	}
 )
 
-func New(lex *lexer.Lexer, selector string) {
+const (
+	Object ExpectationType = iota
+	Array
+)
+
+func New(selector string) *Parser {
 	return &Parser{
-		lex:      lex,
-		selector: selector,
+		exps: parseSelector(selector),
 	}
 }
+
+func (p *Parser) Parse(b []byte) {
+	lex := lexer.New(string(b))
+	go lex.Run()
+
+	for {
+		if item, ok := lex.NextItem(); ok {
+			fmt.Println(item)
+		} else {
+			break
+		}
+	}
+}
+
+func parseSelector(sel string) []Expectation {
+	exps := []Expectation{}
+	parts := strings.Split(sel[1:], "/")
+	for _, part := range parts {
+		if len(part) > 2 && part[:1] == "[" && part[len(part)-1:] == "]" {
+			index, _ := strconv.ParseInt(part[1:len(part)-1], 10, 64)
+			exps = append(exps, Expectation{
+				Type:  Array,
+				Index: index,
+			})
+		} else {
+			exps = append(exps, Expectation{
+				Type: Object,
+				Key:  part,
+			})
+		}
+	}
+
+	return exps
+}