// GO SOURCE FILE MACHINE GENERATED BY RAGEL; DO NOT EDIT

// Copyright 2014 The Cayley Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package nquads

import (
	"bytes"
	"errors"
	"fmt"
	"strconv"

	"github.com/google/cayley/graph"
)

var (
	ErrInvalid    = errors.New("invalid N-Quad")
	ErrIncomplete = errors.New("incomplete N-Quad")
)

%%{
	machine quads;

	include "actions.rl";

	include "nquads.rl";

	write data;
}%%

func parse(data []rune) (graph.Triple, error) {
	var (
		cs, p int
		pe    = len(data)
		eof   = pe

		subject   = -1
		predicate = -1
		object    = -1
		label     = -1

		isEscaped bool

		triple graph.Triple
	)

	%%write init;

	%%write exec;

	return graph.Triple{}, ErrInvalid
}

func unEscape(r []rune, isEscaped bool) string {
	if !isEscaped {
		return string(r)
	}

	buf := bytes.NewBuffer(make([]byte, 0, len(r)))

	for i := 0; i < len(r); {
		switch r[i] {
		case '\\':
			i++
			var c byte
			switch r[i] {
			case 't':
				c = '\t'
			case 'b':
				c = '\b'
			case 'n':
				c = '\n'
			case 'r':
				c = '\r'
			case 'f':
				c = '\f'
			case '"':
				c = '"'
			case '\'':
				c = '\''
			case '\\':
				c = '\\'
			case 'u':
				rc, err := strconv.ParseInt(string(r[i+1:i+5]), 16, 32)
				if err != nil {
					panic(fmt.Errorf("internal parser error: %v", err))
				}
				buf.WriteRune(rune(rc))
				i += 5
				continue
			case 'U':
				rc, err := strconv.ParseInt(string(r[i+1:i+9]), 16, 32)
				if err != nil {
					panic(fmt.Errorf("internal parser error: %v", err))
				}
				buf.WriteRune(rune(rc))
				i += 9
				continue
			}
			buf.WriteByte(c)
		default:
			buf.WriteRune(r[i])
		}
		i++
	}

	return buf.String()
}