/
util.go
122 lines (110 loc) · 2.23 KB
/
util.go
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package fml
import (
. "github.com/fipress/fiputil"
"strings"
"unicode"
)
//Skip spaces and comments
func skipLeft(input []byte) (skip int) {
i := 0
for i < len(input) {
if input[i] == '#' {
i += skipComments(input[i:])
} else if IsSpaceOrLineEnd(input[i]) {
i++
} else {
return i
}
}
return i
}
//Skip comments or spaces until line end
func skipRest(input []byte) (skip int) {
i := 0
for i < len(input) {
if input[i] == '#' {
i += skipComments(input[i:])
} else if IsSpace(input[i]) {
i++
} else if IsLineEnd(input[i]) {
return i + 1
} else {
return i
}
}
return i
}
func skipComments(input []byte) int {
return SkipUntilFunc(input, IsLineEnd, true)
}
//A node end by blank lines.
//A blank line means it contains only spaces or comments
func isBlankLine(input []byte) (bool, int) {
i := 0
for ; i < len(input); i++ {
switch input[i] {
case '\n', '\r', '\f':
return true, i + 1
case ' ', '\t':
case '#':
return true, i + skipComments(input[i:])
default:
return false, 0
}
}
return true, i
}
//A block end by blank lines, or next line starts a list block
func isKeyValueBlockEnd(input []byte) (bool, int) {
isList, _ := isListPrefix(input)
if isList {
return true, 0
}
return isBlockEnd(input)
}
func isBlockEnd(input []byte) (bool, int) {
i := 0
for ; i < len(input); i++ {
switch input[i] {
case '\n', '\r', '\f':
return true, i + 1
case ' ', '\t':
case '#':
return true, i + skipComments(input[i:])
default:
return false, 0
}
}
return true, i
}
func isListPrefix(input []byte) (bool, int) {
idx := SkipSpace(input)
if idx+2 < len(input) &&
input[idx] == '-' &&
IsSpace(input[idx+1]) {
return true, idx + 2
}
return false, 0
}
//value end at line end or comment
func skipUntilValueEnd(input []byte) int {
i := 0
for ; i < len(input); i++ {
if input[i] == '#' && IsSpace(input[i-1]) {
return i - 1
}
if IsLineEnd(input[i]) {
return i
}
}
return i
}
//get value in string
func getRawValue(input []byte) (string, int) {
start := SkipSpace(input)
end := start + skipUntilValueEnd(input[start:])
val := string(input[start:end])
val = strings.TrimRightFunc(val, unicode.IsSpace)
idx := end + skipRest(input[end:])
return val, idx
}