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package linker
import (
"fmt"
"strings"
"github.com/evanw/esbuild/internal/ast"
"github.com/evanw/esbuild/internal/graph"
"github.com/evanw/esbuild/internal/helpers"
"github.com/evanw/esbuild/internal/js_ast"
)
// Set this to true and then load the resulting metafile in "graph-debugger.html"
// to debug graph information.
//
// This is deliberately not exposed in the final binary. It is *very* internal
// and only exists to help debug esbuild itself. Make sure this is always set
// back to false before committing.
const debugVerboseMetafile = false
func (c *linkerContext) generateExtraDataForFileJS(sourceIndex uint32) string {
if !debugVerboseMetafile {
return ""
}
file := &c.graph.Files[sourceIndex]
repr := file.InputFile.Repr.(*graph.JSRepr)
sb := strings.Builder{}
isFirstPartWithStmts := true
quoteSym := func(ref ast.Ref) string {
name := fmt.Sprintf("%d:%d [%s]", ref.SourceIndex, ref.InnerIndex, c.graph.Symbols.Get(ref).OriginalName)
return string(helpers.QuoteForJSON(name, c.options.ASCIIOnly))
}
sb.WriteString(`,"parts":[`)
for partIndex, part := range repr.AST.Parts {
if partIndex > 0 {
sb.WriteByte(',')
}
var isFirst bool
code := ""
sb.WriteString(fmt.Sprintf(`{"isLive":%v`, part.IsLive))
sb.WriteString(fmt.Sprintf(`,"canBeRemovedIfUnused":%v`, part.CanBeRemovedIfUnused))
if partIndex == int(js_ast.NSExportPartIndex) {
sb.WriteString(`,"nsExportPartIndex":true`)
} else if ast.MakeIndex32(uint32(partIndex)) == repr.Meta.WrapperPartIndex {
sb.WriteString(`,"wrapperPartIndex":true`)
} else if len(part.Stmts) > 0 {
contents := file.InputFile.Source.Contents
start := int(part.Stmts[0].Loc.Start)
if isFirstPartWithStmts {
start = 0
isFirstPartWithStmts = false
}
end := len(contents)
if partIndex+1 < len(repr.AST.Parts) {
if nextStmts := repr.AST.Parts[partIndex+1].Stmts; len(nextStmts) > 0 {
if nextStart := int(nextStmts[0].Loc.Start); nextStart >= start {
end = int(nextStart)
}
}
}
start = moveBeforeExport(contents, start)
end = moveBeforeExport(contents, end)
code = contents[start:end]
}
// importRecords
sb.WriteString(`,"importRecords":[`)
isFirst = true
for _, importRecordIndex := range part.ImportRecordIndices {
record := repr.AST.ImportRecords[importRecordIndex]
if !record.SourceIndex.IsValid() {
continue
}
if isFirst {
isFirst = false
} else {
sb.WriteByte(',')
}
path := c.graph.Files[record.SourceIndex.GetIndex()].InputFile.Source.PrettyPaths.Rel
sb.WriteString(fmt.Sprintf(`{"source":%s}`, helpers.QuoteForJSON(path, c.options.ASCIIOnly)))
}
sb.WriteByte(']')
// declaredSymbols
sb.WriteString(`,"declaredSymbols":[`)
isFirst = true
for _, declSym := range part.DeclaredSymbols {
if !declSym.IsTopLevel {
continue
}
if isFirst {
isFirst = false
} else {
sb.WriteByte(',')
}
sb.WriteString(fmt.Sprintf(`{"name":%s}`, quoteSym(declSym.Ref)))
}
sb.WriteByte(']')
// symbolUses
sb.WriteString(`,"symbolUses":[`)
isFirst = true
for ref, uses := range part.SymbolUses {
if isFirst {
isFirst = false
} else {
sb.WriteByte(',')
}
sb.WriteString(fmt.Sprintf(`{"name":%s,"countEstimate":%d}`, quoteSym(ref), uses.CountEstimate))
}
sb.WriteByte(']')
// dependencies
sb.WriteString(`,"dependencies":[`)
for i, dep := range part.Dependencies {
if i > 0 {
sb.WriteByte(',')
}
sb.WriteString(fmt.Sprintf(`{"source":%s,"partIndex":%d}`,
helpers.QuoteForJSON(c.graph.Files[dep.SourceIndex].InputFile.Source.PrettyPaths.Rel, c.options.ASCIIOnly),
dep.PartIndex,
))
}
sb.WriteByte(']')
// code
sb.WriteString(`,"code":`)
sb.Write(helpers.QuoteForJSON(code, c.options.ASCIIOnly))
sb.WriteByte('}')
}
sb.WriteString(`]`)
return sb.String()
}
func moveBeforeExport(contents string, i int) int {
contents = strings.TrimRight(contents[:i], " \t\r\n")
if strings.HasSuffix(contents, "export") {
return len(contents) - 6
}
return i
}
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