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// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 dissect

import (
	"errors"
	"regexp"
)

var (
	// delimiterRE tokenizes the following string into walkable with extracted delimiter + key.
	// string:
	// ` %{key}, %{key/2}`
	// into:
	// [["", "key" ], [", ", "key/2"]]
	ordinalIndicator     = "/"
	fixedLengthIndicator = "#"

	skipFieldPrefix      = "?"
	appendFieldPrefix    = "+"
	indirectFieldPrefix  = "&"
	appendIndirectPrefix = "+&"
	indirectAppendPrefix = "&+"
	greedySuffix         = "->"
	pointerFieldPrefix   = "*"
	dataTypeIndicator    = "|"
	dataTypeSeparator    = "\\|" // Needed for regexp

	numberRE = "\\d{1,2}"
	alphaRE  = "[[:alpha:]]*"

	delimiterRE = regexp.MustCompile("(?s)(.*?)%\\{([^}]*?)}")
	suffixRE    = regexp.MustCompile("(.+?)" + // group 1 for key name
		"(" + ordinalIndicator + "(" + numberRE + ")" + ")?" + // group 2, 3 for ordinal
		"(" + fixedLengthIndicator + "(" + numberRE + ")" + ")?" + // group 4, 5 for fixed length
		"(" + greedySuffix + ")?" + // group 6 for greedy
		"(" + dataTypeSeparator + "(" + alphaRE + ")?" + ")?$") // group 7,8 for data type separator and data type

	defaultJoinString = " "

	errParsingFailure            = errors.New("parsing failure")
	errInvalidTokenizer          = errors.New("invalid dissect tokenizer")
	errEmpty                     = errors.New("empty string provided")
	errMixedPrefixIndirectAppend = errors.New("mixed prefix `&+`")
	errMixedPrefixAppendIndirect = errors.New("mixed prefix `&+`")
	errEmptyKey                  = errors.New("empty key")
	errInvalidDatatype           = errors.New("invalid data type")
	errMissingDatatype           = errors.New("missing data type")
)
