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package engine
import "strings"
type CommentMode int
const (
CommentsFollow CommentMode = iota
CommentsPrecede
CommentsStandalone
)
type Engine struct {
CommentMode CommentMode
}
func (e *Engine) format(events []LineEvent, resultBuilder *strings.Builder) {
hasWrittenContent := false
previousWasOpenBrace := false
previousStatementType := ""
previousWasComment := false
previousWasTopLevel := false
previousWasScoped := false
for eventIndex, event := range events {
if event.InRawString {
if hasWrittenContent {
resultBuilder.WriteByte('\n')
}
resultBuilder.WriteString(event.Content)
hasWrittenContent = true
continue
}
if event.IsBlank {
continue
}
currentStatementType := event.StatementType
if event.IsPackageDecl {
currentStatementType = "package"
}
needsBlankLine := false
currentIsTopLevel := event.HasASTInfo && event.IsTopLevel
currentIsScoped := event.HasASTInfo && event.IsScoped
if hasWrittenContent && !previousWasOpenBrace && !event.IsClosingBrace && !event.IsCaseLabel && !event.IsContinuation {
if currentIsTopLevel && previousWasTopLevel && currentStatementType != previousStatementType {
if !(e.CommentMode == CommentsFollow && previousWasComment) {
needsBlankLine = true
}
} else if event.HasASTInfo && (currentIsScoped || previousWasScoped) {
if !(e.CommentMode == CommentsFollow && previousWasComment) {
needsBlankLine = true
}
} else if currentStatementType != "" && previousStatementType != "" && currentStatementType != previousStatementType {
if !(e.CommentMode == CommentsFollow && previousWasComment) {
needsBlankLine = true
}
}
if e.CommentMode == CommentsFollow && event.IsCommentOnly && !previousWasComment {
nextIndex := e.findNextNonComment(events, eventIndex+1)
if nextIndex >= 0 {
nextNonCommentEvent := events[nextIndex]
if nextNonCommentEvent.HasASTInfo {
nextIsTopLevel := nextNonCommentEvent.IsTopLevel
nextIsScoped := nextNonCommentEvent.IsScoped
if nextIsTopLevel && previousWasTopLevel && nextNonCommentEvent.StatementType != previousStatementType {
needsBlankLine = true
} else if nextIsScoped || previousWasScoped {
needsBlankLine = true
} else if nextNonCommentEvent.StatementType != "" && previousStatementType != "" && nextNonCommentEvent.StatementType != previousStatementType {
needsBlankLine = true
}
}
}
}
}
if needsBlankLine {
resultBuilder.WriteByte('\n')
}
if hasWrittenContent {
resultBuilder.WriteByte('\n')
}
resultBuilder.WriteString(event.Content)
hasWrittenContent = true
previousWasOpenBrace = event.IsOpeningBrace || event.IsCaseLabel
previousWasComment = event.IsCommentOnly
if event.HasASTInfo {
previousStatementType = event.StatementType
previousWasTopLevel = event.IsTopLevel
previousWasScoped = event.IsScoped
} else if currentStatementType != "" {
previousStatementType = currentStatementType
previousWasTopLevel = false
previousWasScoped = false
}
}
resultBuilder.WriteByte('\n')
}
func (e *Engine) FormatToString(events []LineEvent) string {
var resultBuilder strings.Builder
resultBuilder.Grow(len(events) * 40)
e.format(events, &resultBuilder)
return resultBuilder.String()
}
func (e *Engine) FormatToBytes(events []LineEvent) []byte {
var resultBuilder strings.Builder
resultBuilder.Grow(len(events) * 40)
e.format(events, &resultBuilder)
return []byte(resultBuilder.String())
}
func (e *Engine) findNextNonComment(events []LineEvent, startIndex int) int {
for eventIndex := startIndex; eventIndex < len(events); eventIndex++ {
if events[eventIndex].IsBlank {
continue
}
if events[eventIndex].IsCommentOnly {
continue
}
return eventIndex
}
return -1
}
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