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package main
import (
"fmt"
"go/ast"
"go/token"
)
func isGeneralDeclarationScoped(generalDeclaration *ast.GenDecl) bool {
for _, specification := range generalDeclaration.Specs {
if typeSpecification, isTypeSpecification := specification.(*ast.TypeSpec); isTypeSpecification {
switch typeSpecification.Type.(type) {
case *ast.StructType, *ast.InterfaceType:
return true
}
}
}
return false
}
func (f *Formatter) buildLineInfo(tokenFileSet *token.FileSet, parsedFile *ast.File) map[int]*lineInformation {
lineInformationMap := make(map[int]*lineInformation, 2*len(parsedFile.Decls))
tokenFile := tokenFileSet.File(parsedFile.Pos())
if tokenFile == nil {
return lineInformationMap
}
for _, declaration := range parsedFile.Decls {
startLine := tokenFile.Line(declaration.Pos())
endLine := tokenFile.Line(declaration.End())
statementType := ""
isScoped := false
switch typedDeclaration := declaration.(type) {
case *ast.GenDecl:
statementType = typedDeclaration.Tok.String()
isScoped = isGeneralDeclarationScoped(typedDeclaration)
case *ast.FuncDecl:
statementType = "func"
isScoped = true
default:
statementType = fmt.Sprintf("%T", declaration)
}
lineInformationMap[startLine] = &lineInformation{statementType: statementType, isTopLevel: true, isScoped: isScoped, isStartLine: true}
if endLine != startLine {
lineInformationMap[endLine] = &lineInformation{statementType: statementType, isTopLevel: true, isScoped: isScoped, isStartLine: false}
}
}
ast.Inspect(parsedFile, func(astNode ast.Node) bool {
if astNode == nil {
return true
}
switch typedNode := astNode.(type) {
case *ast.BlockStmt:
f.processBlock(tokenFile, typedNode, lineInformationMap)
case *ast.CaseClause:
f.processStatementList(tokenFile, typedNode.Body, lineInformationMap)
case *ast.CommClause:
f.processStatementList(tokenFile, typedNode.Body, lineInformationMap)
}
return true
})
return lineInformationMap
}
func (f *Formatter) processBlock(tokenFile *token.File, blockStatement *ast.BlockStmt, lineInformationMap map[int]*lineInformation) {
if blockStatement == nil {
return
}
f.processStatementList(tokenFile, blockStatement.List, lineInformationMap)
}
func (f *Formatter) processStatementList(tokenFile *token.File, statements []ast.Stmt, lineInformationMap map[int]*lineInformation) {
for _, statement := range statements {
startLine := tokenFile.Line(statement.Pos())
endLine := tokenFile.Line(statement.End())
statementType := ""
isScoped := false
switch typedStatement := statement.(type) {
case *ast.DeclStmt:
if generalDeclaration, isGeneralDeclaration := typedStatement.Decl.(*ast.GenDecl); isGeneralDeclaration {
statementType = generalDeclaration.Tok.String()
} else {
statementType = fmt.Sprintf("%T", statement)
}
case *ast.IfStmt, *ast.ForStmt, *ast.RangeStmt, *ast.SwitchStmt,
*ast.TypeSwitchStmt, *ast.SelectStmt, *ast.BlockStmt:
statementType = fmt.Sprintf("%T", statement)
isScoped = true
default:
statementType = fmt.Sprintf("%T", statement)
}
existingStart := lineInformationMap[startLine]
if existingStart == nil || !existingStart.isStartLine {
lineInformationMap[startLine] = &lineInformation{statementType: statementType, isTopLevel: false, isScoped: isScoped, isStartLine: true}
}
existingEnd := lineInformationMap[endLine]
if existingEnd == nil || !existingEnd.isStartLine {
lineInformationMap[endLine] = &lineInformation{statementType: statementType, isTopLevel: false, isScoped: isScoped, isStartLine: false}
}
switch typedStatement := statement.(type) {
case *ast.IfStmt:
f.processBlock(tokenFile, typedStatement.Body, lineInformationMap)
if typedStatement.Else != nil {
if elseBlock, isBlockStatement := typedStatement.Else.(*ast.BlockStmt); isBlockStatement {
f.processBlock(tokenFile, elseBlock, lineInformationMap)
} else if elseIfStatement, isIfStatement := typedStatement.Else.(*ast.IfStmt); isIfStatement {
f.processIfStatement(tokenFile, elseIfStatement, lineInformationMap)
}
}
case *ast.ForStmt:
f.processBlock(tokenFile, typedStatement.Body, lineInformationMap)
case *ast.RangeStmt:
f.processBlock(tokenFile, typedStatement.Body, lineInformationMap)
case *ast.SwitchStmt:
f.processBlock(tokenFile, typedStatement.Body, lineInformationMap)
case *ast.TypeSwitchStmt:
f.processBlock(tokenFile, typedStatement.Body, lineInformationMap)
case *ast.SelectStmt:
f.processBlock(tokenFile, typedStatement.Body, lineInformationMap)
case *ast.BlockStmt:
f.processBlock(tokenFile, typedStatement, lineInformationMap)
}
}
}
func (f *Formatter) processIfStatement(tokenFile *token.File, ifStatement *ast.IfStmt, lineInformationMap map[int]*lineInformation) {
startLine := tokenFile.Line(ifStatement.Pos())
endLine := tokenFile.Line(ifStatement.End())
existingStart := lineInformationMap[startLine]
if existingStart == nil || !existingStart.isStartLine {
lineInformationMap[startLine] = &lineInformation{statementType: "*ast.IfStmt", isTopLevel: false, isScoped: true, isStartLine: true}
}
existingEnd := lineInformationMap[endLine]
if existingEnd == nil || !existingEnd.isStartLine {
lineInformationMap[endLine] = &lineInformation{statementType: "*ast.IfStmt", isTopLevel: false, isScoped: true, isStartLine: false}
}
f.processBlock(tokenFile, ifStatement.Body, lineInformationMap)
if ifStatement.Else != nil {
if elseBlock, isBlockStatement := ifStatement.Else.(*ast.BlockStmt); isBlockStatement {
f.processBlock(tokenFile, elseBlock, lineInformationMap)
} else if elseIfStatement, isIfStatement := ifStatement.Else.(*ast.IfStmt); isIfStatement {
f.processIfStatement(tokenFile, elseIfStatement, lineInformationMap)
}
}
}
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