caddy/caddyconfig/caddyfile/formatter.go
Vaibhav 71e81d262b
fmt: Add support for block nesting. ()
Previously the formatter did not include support for
blocks inside other blocks. Hence the formatter could
not indent some files properly. This fixes it.

Fixes 

Signed-off-by: Vaibhav <vrongmeal@gmail.com>
2020-02-29 13:23:08 -07:00

140 lines
2.4 KiB
Go

// 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()
}