|
| 1 | +package build |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "fmt" |
| 6 | + "go/ast" |
| 7 | + "go/parser" |
| 8 | + "go/token" |
| 9 | + "strconv" |
| 10 | + |
| 11 | + "github.com/visualfc/goembed" |
| 12 | +) |
| 13 | + |
| 14 | +func buildIdent(name string) string { |
| 15 | + return fmt.Sprintf("__gopherjs_embed_%x__", name) |
| 16 | +} |
| 17 | + |
| 18 | +var embed_head = `package %v |
| 19 | +
|
| 20 | +import ( |
| 21 | + "embed" |
| 22 | + _ "unsafe" |
| 23 | +) |
| 24 | +
|
| 25 | +//go:linkname __gopherjs_embed_buildFS__ embed.buildFS |
| 26 | +func __gopherjs_embed_buildFS__(list []struct { |
| 27 | + name string |
| 28 | + data string |
| 29 | + hash [16]byte |
| 30 | +}) (f embed.FS) |
| 31 | +` |
| 32 | + |
| 33 | +// embedFiles generates an additional source file, which initializes all variables in the package with a go:embed directive. |
| 34 | +func embedFiles(pkg *PackageData, fset *token.FileSet, files []*ast.File) (*ast.File, error) { |
| 35 | + if len(pkg.EmbedPatternPos) == 0 { |
| 36 | + return nil, nil |
| 37 | + } |
| 38 | + |
| 39 | + ems, err := goembed.CheckEmbed(pkg.EmbedPatternPos, fset, files) |
| 40 | + if err != nil { |
| 41 | + return nil, err |
| 42 | + } |
| 43 | + |
| 44 | + r := goembed.NewResolve() |
| 45 | + for _, em := range ems { |
| 46 | + fs, err := r.Load(pkg.Dir, fset, em) |
| 47 | + if err != nil { |
| 48 | + return nil, err |
| 49 | + } |
| 50 | + switch em.Kind { |
| 51 | + case goembed.EmbedMaybeAlias: |
| 52 | + // value = Type(data) |
| 53 | + // valid alias string or []byte type used by types.check |
| 54 | + em.Spec.Values = []ast.Expr{ |
| 55 | + &ast.CallExpr{ |
| 56 | + Fun: em.Spec.Type, |
| 57 | + Args: []ast.Expr{ |
| 58 | + &ast.Ident{Name: buildIdent(fs[0].Name), |
| 59 | + NamePos: em.Spec.Names[0].NamePos}, |
| 60 | + }, |
| 61 | + }} |
| 62 | + case goembed.EmbedBytes: |
| 63 | + // value = []byte(data) |
| 64 | + em.Spec.Values = []ast.Expr{ |
| 65 | + &ast.CallExpr{ |
| 66 | + Fun: em.Spec.Type, |
| 67 | + Args: []ast.Expr{ast.NewIdent(buildIdent(fs[0].Name))}, |
| 68 | + }} |
| 69 | + case goembed.EmbedString: |
| 70 | + // value = data |
| 71 | + em.Spec.Values = []ast.Expr{ast.NewIdent(buildIdent(fs[0].Name))} |
| 72 | + case goembed.EmbedFiles: |
| 73 | + // value = __gopherjs_embed_buildFS__([]struct{name string; data string; hash [16]byte}{...}) |
| 74 | + fs = goembed.BuildFS(fs) |
| 75 | + elts := make([]ast.Expr, len(fs)) |
| 76 | + for i, f := range fs { |
| 77 | + if len(f.Data) == 0 { |
| 78 | + elts[i] = &ast.CompositeLit{ |
| 79 | + Elts: []ast.Expr{ |
| 80 | + &ast.BasicLit{Kind: token.STRING, Value: strconv.Quote(f.Name)}, |
| 81 | + &ast.BasicLit{Kind: token.STRING, Value: `""`}, |
| 82 | + &ast.CompositeLit{ |
| 83 | + Type: &ast.ArrayType{ |
| 84 | + Len: &ast.BasicLit{Kind: token.INT, Value: "16"}, |
| 85 | + Elt: ast.NewIdent("byte"), |
| 86 | + }, |
| 87 | + }, |
| 88 | + }, |
| 89 | + } |
| 90 | + } else { |
| 91 | + var hash [16]ast.Expr |
| 92 | + for j, v := range f.Hash { |
| 93 | + hash[j] = &ast.BasicLit{Kind: token.INT, Value: strconv.Itoa(int(v))} |
| 94 | + } |
| 95 | + elts[i] = &ast.CompositeLit{ |
| 96 | + Elts: []ast.Expr{ |
| 97 | + &ast.BasicLit{Kind: token.STRING, Value: strconv.Quote(f.Name)}, |
| 98 | + ast.NewIdent(buildIdent(f.Name)), |
| 99 | + &ast.CompositeLit{ |
| 100 | + Type: &ast.ArrayType{ |
| 101 | + Len: &ast.BasicLit{Kind: token.INT, Value: "16"}, |
| 102 | + Elt: ast.NewIdent("byte"), |
| 103 | + }, |
| 104 | + Elts: hash[:], |
| 105 | + }, |
| 106 | + }, |
| 107 | + } |
| 108 | + } |
| 109 | + } |
| 110 | + call := &ast.CallExpr{ |
| 111 | + Fun: ast.NewIdent("__gopherjs_embed_buildFS__"), |
| 112 | + Args: []ast.Expr{ |
| 113 | + &ast.CompositeLit{ |
| 114 | + Type: &ast.ArrayType{ |
| 115 | + Elt: &ast.StructType{ |
| 116 | + Fields: &ast.FieldList{ |
| 117 | + List: []*ast.Field{ |
| 118 | + &ast.Field{ |
| 119 | + Names: []*ast.Ident{ast.NewIdent("name")}, |
| 120 | + Type: ast.NewIdent("string"), |
| 121 | + }, |
| 122 | + &ast.Field{ |
| 123 | + Names: []*ast.Ident{ast.NewIdent("data")}, |
| 124 | + Type: ast.NewIdent("string"), |
| 125 | + }, |
| 126 | + &ast.Field{ |
| 127 | + Names: []*ast.Ident{ast.NewIdent("hash")}, |
| 128 | + Type: &ast.ArrayType{ |
| 129 | + Len: &ast.BasicLit{Kind: token.INT, Value: "16"}, |
| 130 | + Elt: ast.NewIdent("byte"), |
| 131 | + }, |
| 132 | + }, |
| 133 | + }, |
| 134 | + }, |
| 135 | + }, |
| 136 | + }, |
| 137 | + Elts: elts, |
| 138 | + }, |
| 139 | + }, |
| 140 | + } |
| 141 | + em.Spec.Values = []ast.Expr{call} |
| 142 | + } |
| 143 | + } |
| 144 | + |
| 145 | + var buf bytes.Buffer |
| 146 | + fmt.Fprintf(&buf, embed_head, pkg.Name) |
| 147 | + buf.WriteString("\nconst (\n") |
| 148 | + for _, f := range r.Files() { |
| 149 | + if len(f.Data) == 0 { |
| 150 | + fmt.Fprintf(&buf, "\t%v = \"\"\n", buildIdent(f.Name)) |
| 151 | + } else { |
| 152 | + fmt.Fprintf(&buf, "\t%v = \"%v\"\n", buildIdent(f.Name), goembed.BytesToHex(f.Data)) |
| 153 | + } |
| 154 | + } |
| 155 | + buf.WriteString(")\n\n") |
| 156 | + f, err := parser.ParseFile(fset, "js_embed.go", buf.String(), parser.ParseComments) |
| 157 | + if err != nil { |
| 158 | + return nil, err |
| 159 | + } |
| 160 | + return f, nil |
| 161 | +} |
| 162 | + |
| 163 | +func joinEmbedPatternPos(m1, m2 map[string][]token.Position) map[string][]token.Position { |
| 164 | + if len(m1) == 0 && len(m2) == 0 { |
| 165 | + return nil |
| 166 | + } |
| 167 | + m := make(map[string][]token.Position) |
| 168 | + for k, v := range m1 { |
| 169 | + m[k] = v |
| 170 | + } |
| 171 | + for k, v := range m2 { |
| 172 | + m[k] = append(m[k], v...) |
| 173 | + } |
| 174 | + return m |
| 175 | +} |
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