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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// 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 caddyfile
import (
"bytes"
"io"
"unicode"
)
// Format formats a Caddyfile to conventional standards.
func Format(body []byte) []byte {
reader := bytes.NewReader(body)
result := new(bytes.Buffer)
var (
commented,
quoted,
escaped,
environ,
lineBegin bool
firstIteration = true
indentation = 0
prev,
curr,
next rune
err error
)
for {
prev = curr
curr = next
if curr < 0 {
break
}
next, _, err = reader.ReadRune()
if err != nil {
if err == io.EOF {
next = -1
} else {
panic(err)
}
}
if firstIteration {
firstIteration = false
lineBegin = true
continue
}
if quoted {
if escaped {
escaped = false
} else {
if curr == '\\' {
escaped = true
}
if curr == '"' {
quoted = false
}
}
if curr == '\n' {
quoted = false
}
} else if commented {
if curr == '\n' {
commented = false
}
} else {
if curr == '"' {
quoted = true
}
if curr == '#' {
commented = true
}
if curr == '}' {
if environ {
environ = false
} else if indentation > 0 {
indentation--
}
}
if curr == '{' {
if unicode.IsSpace(next) {
indentation++
if !unicode.IsSpace(prev) {
result.WriteRune(' ')
}
} else {
environ = true
}
}
if lineBegin {
if curr == ' ' || curr == '\t' {
continue
} else {
lineBegin = false
if indentation > 0 {
for tabs := indentation; tabs > 0; tabs-- {
result.WriteRune('\t')
}
}
}
} else {
if prev == '{' &&
(curr == ' ' || curr == '\t') &&
(next != '\n' && next != '\r') {
curr = '\n'
}
}
}
if curr == '\n' {
lineBegin = true
}
result.WriteRune(curr)
}
return result.Bytes()
}
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