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sequence.go
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sequence.go
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// Copyright (c) 2014 Dataence, LLC. 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 sequence
import (
"errors"
"fmt"
"strings"
)
//go:generate go run genmethods.go -- reqmethods.go
//go:generate go fmt reqmethods.go
var (
ErrNoMatch = errors.New("sequence: no pattern matched for this message")
)
// Sequence represents a list of tokens returned from the scanner, analyzer or parser.
type Sequence []Token
// String returns a single line string that represents the pattern for the Sequence
func (this Sequence) String() (string, []int) {
var p string
var pos []int
var start = 0
for _, token := range this {
var c string
if config.markSpaces && token.IsSpaceBefore {
start += 1
}
if token.Tag != TagUnknown {
c = token.Tag.String()
if token.Type == TokenTime && token.Tag == TagRegExTime {
//append the regex type
c += ":" + token.Special
}
if token.until != "" {
c += ":-:" + token.until
} else {
if token.Type != token.Tag.TokenType() {
c += ":" + token.Type.String()
} else if token.plus || token.minus || token.star {
c += ":"
}
if token.plus {
c += ":+"
} else if token.minus {
c += ":-"
} else if token.star {
c += ":*"
}
}
c = "%" + c + "%"
pos = append(pos, start)
} else if token.Type != TokenUnknown && token.Type != TokenLiteral {
c = token.Type.String()
if token.plus {
c += ":+"
} else if token.minus {
c += ":-"
} else if token.star {
c += ":*"
}
c = "%" + c + "%"
pos = append(pos, start)
} else {
c = token.Value
}
//if the spaces are marked on the token
//if we need one before isSpaceBefore will be set to true
if !config.markSpaces {
p += c + " "
start += 1
} else if token.IsSpaceBefore {
p += " " + c
} else {
p += c
}
start += len(c)
}
return strings.TrimRight(p, " "), pos
}
// Signature returns a single line string that represents a common pattern for this
// types of messages, basically stripping any strings or literals from the message.
func (this Sequence) Signature() string {
var sig string
for _, token := range this {
switch {
case token.Type != TokenUnknown && token.Type != TokenString && token.Type != TokenLiteral:
sig += "%" + token.Type.String() + "%"
case token.Type == TokenLiteral && len(token.Value) == 1:
sig += token.Value
}
}
return sig
}
// Longstring returns a multi-line representation of the tokens in the sequence
func (this Sequence) PrintTokens() string {
var str string
for i, t := range this {
str += fmt.Sprintf("# %3d: %s\n", i, t)
}
return str[:len(str)-1]
}