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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 the input Caddyfile to a standard, nice-looking
// appearance. It works by reading each rune of the input and taking
// control over all the bracing and whitespace that is written; otherwise,
// words, comments, placeholders, and escaped characters are all treated
// literally and written as they appear in the input.
func Format(input []byte) []byte {
input = bytes.TrimSpace(input)
out := new(bytes.Buffer)
rdr := bytes.NewReader(input)
var (
last rune // the last character that was written to the result
space = true // whether current/previous character was whitespace (beginning of input counts as space)
beginningOfLine = true // whether we are at beginning of line
openBrace bool // whether current word/token is or started with open curly brace
openBraceWritten bool // if openBrace, whether that brace was written or not
openBraceSpace bool // whether there was a non-newline space before open brace
newLines int // count of newlines consumed
comment bool // whether we're in a comment
quoted bool // whether we're in a quoted segment
escaped bool // whether current char is escaped
nesting int // indentation level
)
write := func(ch rune) {
out.WriteRune(ch)
last = ch
}
indent := func() {
for tabs := nesting; tabs > 0; tabs-- {
write('\t')
}
}
nextLine := func() {
write('\n')
beginningOfLine = true
}
for {
ch, _, err := rdr.ReadRune()
if err != nil {
if err == io.EOF {
break
}
panic(err)
}
if comment {
if ch == '\n' {
comment = false
} else {
write(ch)
continue
}
}
if !escaped && ch == '\\' {
if space {
write(' ')
space = false
}
write(ch)
escaped = true
continue
}
if escaped {
write(ch)
escaped = false
continue
}
if quoted {
if ch == '"' {
quoted = false
}
write(ch)
continue
}
if space && ch == '"' {
quoted = true
}
if unicode.IsSpace(ch) {
space = true
if ch == '\n' {
newLines++
}
continue
}
spacePrior := space
space = false
//////////////////////////////////////////////////////////
// I find it helpful to think of the formatting loop in two
// main sections; by the time we reach this point, we
// know we are in a "regular" part of the file: we know
// the character is not a space, not in a literal segment
// like a comment or quoted, it's not escaped, etc.
//////////////////////////////////////////////////////////
if ch == '#' {
comment = true
}
if openBrace && spacePrior && !openBraceWritten {
if nesting == 0 && last == '}' {
nextLine()
nextLine()
}
openBrace = false
if beginningOfLine {
indent()
} else if !openBraceSpace {
write(' ')
}
write('{')
openBraceWritten = true
nextLine()
newLines = 0
nesting++
}
switch {
case ch == '{':
openBrace = true
openBraceWritten = false
openBraceSpace = spacePrior && !beginningOfLine
if openBraceSpace {
write(' ')
}
continue
case ch == '}' && (spacePrior || !openBrace):
if last != '\n' {
nextLine()
}
if nesting > 0 {
nesting--
}
indent()
write('}')
newLines = 0
continue
}
if newLines > 2 {
newLines = 2
}
for i := 0; i < newLines; i++ {
nextLine()
}
newLines = 0
if beginningOfLine {
indent()
}
if nesting == 0 && last == '}' && beginningOfLine {
nextLine()
nextLine()
}
if !beginningOfLine && spacePrior {
write(' ')
}
if openBrace && !openBraceWritten {
write('{')
openBraceWritten = true
}
write(ch)
beginningOfLine = false
}
// the Caddyfile does not need any leading or trailing spaces, but...
trimmedResult := bytes.TrimSpace(out.Bytes())
// ...Caddyfiles should, however, end with a newline because
// newlines are significant to the syntax of the file
return append(trimmedResult, '\n')
}
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