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Original file line number | Diff line number | Diff line change |
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package main | ||
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import ( | ||
"fmt" | ||
"io" | ||
"strconv" | ||
"strings" | ||
) | ||
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type writer struct { | ||
extractor | ||
out io.Writer | ||
indent int | ||
} | ||
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func write(extractor extractor, out io.Writer) { | ||
wr := writer{extractor, out, 0} | ||
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wr.writePackage() | ||
wr.writeImports() | ||
wr.writeInterface() | ||
wr.writeResolver() | ||
wr.writeSchema() | ||
} | ||
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func (w *writer) emit(format string, args ...interface{}) { | ||
io.WriteString(w.out, fmt.Sprintf(format, args...)) | ||
} | ||
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func (w *writer) emitIndent() { | ||
io.WriteString(w.out, strings.Repeat(" ", w.indent)) | ||
} | ||
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func (w *writer) begin(format string, args ...interface{}) { | ||
w.emitIndent() | ||
w.emit(format, args...) | ||
w.lf() | ||
w.indent++ | ||
} | ||
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func (w *writer) end(format string, args ...interface{}) { | ||
w.indent-- | ||
w.emitIndent() | ||
w.emit(format, args...) | ||
w.lf() | ||
} | ||
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func (w *writer) line(format string, args ...interface{}) { | ||
w.emitIndent() | ||
w.emit(format, args...) | ||
w.lf() | ||
} | ||
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func (w *writer) lf() { | ||
w.out.Write([]byte("\n")) | ||
} | ||
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func (w *writer) writePackage() { | ||
w.line("package %s", w.PackageName) | ||
w.lf() | ||
} | ||
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func (w *writer) writeImports() { | ||
w.begin("import (") | ||
for local, pkg := range w.Imports { | ||
w.line("%s %s", local, strconv.Quote(pkg)) | ||
} | ||
w.end(")") | ||
w.lf() | ||
} | ||
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func (w *writer) writeInterface() { | ||
w.begin("type Resolvers interface {") | ||
for _, o := range w.Objects { | ||
for _, f := range o.Fields { | ||
if f.Bind != "" { | ||
continue | ||
} | ||
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w.emitIndent() | ||
w.emit("%s_%s(", o.Name, f.Name) | ||
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first := true | ||
for _, arg := range f.Args { | ||
if !first { | ||
w.emit(",") | ||
} | ||
first = false | ||
w.emit("%s %s", arg.Name, arg.Type.Local()) | ||
} | ||
w.emit(") (%s, error)", f.Type.Local()) | ||
w.lf() | ||
} | ||
} | ||
w.end("}") | ||
w.lf() | ||
} | ||
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func (w *writer) writeResolver() { | ||
w.begin("func NewResolver(r Resolvers) exec.Root {") | ||
w.line("return &resolvers{r}") | ||
w.end("}") | ||
w.lf() | ||
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w.begin("type resolvers struct {") | ||
w.line("resolvers Resolvers") | ||
w.end("}") | ||
w.lf() | ||
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for _, object := range w.Objects { | ||
w.writeObjectResolver(object) | ||
} | ||
} | ||
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func (w *writer) writeObjectResolver(object object) { | ||
objectName := "it" | ||
if object.Type.Name != "interface{}" { | ||
objectName = "object" | ||
} | ||
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w.begin("func (r *resolvers) %s(ec *exec.ExecutionContext, %s interface{}, field string, arguments map[string]interface{}, sels []query.Selection) jsonw.Encodable {", object.Type.GraphQLName, objectName) | ||
if object.Type.Name != "interface{}" { | ||
w.line("it := object.(*%s)", object.Type.Local()) | ||
} | ||
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w.line("switch field {") | ||
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for _, field := range object.Fields { | ||
w.begin("case %s:", strconv.Quote(field.Name)) | ||
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if field.Bind != "" { | ||
w.writeFieldBind(field) | ||
} else { | ||
w.writeFieldResolver(object, field) | ||
} | ||
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w.end("") | ||
} | ||
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w.line("}") | ||
w.line(`panic("unknown field " + field)`) | ||
w.end("}") | ||
w.lf() | ||
} | ||
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func (w *writer) writeFieldBind(field Field) { | ||
w.line("return jsonw.%s(it.%s)", field.Type.GraphQLName, field.Bind) | ||
} | ||
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func (w *writer) writeFieldResolver(object object, field Field) { | ||
call := fmt.Sprintf("result, err := r.resolvers.%s_%s", object.Name, field.Name) | ||
if len(field.Args) == 0 { | ||
w.line(call + "()") | ||
} else { | ||
w.begin(call + "(") | ||
for _, arg := range field.Args { | ||
w.line("arguments[%s].(%s),", strconv.Quote(arg.Name), arg.Type.Local()) | ||
} | ||
w.end(")") | ||
} | ||
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w.line("if err != nil {") | ||
w.line(" ec.Error(err)") | ||
w.line(" return jsonw.Null") | ||
w.line("}") | ||
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result := "result" | ||
if !strings.HasPrefix(field.Type.Prefix, "*") { | ||
result = "&result" | ||
} | ||
w.line("return ec.ExecuteSelectionSet(sels, r.%s, %s)", field.Type.Name, result) | ||
} | ||
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func (w *writer) writeSchema() { | ||
w.line("var Schema = schema.MustParse(%s)", strconv.Quote(w.schemaRaw)) | ||
} |
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