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inspect.go
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package main | |
import ( | |
"bytes" | |
"fmt" | |
"go/ast" | |
"go/parser" | |
"go/printer" | |
"go/token" | |
"strings" | |
) | |
func parseFunc(filename, functionname string) (fun *ast.FuncDecl, fset *token.FileSet) { | |
fset = token.NewFileSet() | |
if file, err := parser.ParseFile(fset, filename, nil, 0); err == nil { | |
for _, d := range file.Decls { | |
if f, ok := d.(*ast.FuncDecl); ok && f.Name.Name == functionname { | |
fun = f | |
return | |
} | |
} | |
} | |
panic("function not found") | |
} | |
func ExampleFprint() { | |
// Parse source file and extract the AST without comments for | |
// this function, with position information referring to the | |
// file set fset. | |
funcAST, fset := parseFunc("../gooo.go", "Test") | |
// Print the function body into buffer buf. | |
// The file set is provided to the printer so that it knows | |
// about the original source formatting and can add additional | |
// line breaks where they were present in the source. | |
var buf bytes.Buffer | |
printer.Fprint(&buf, fset, funcAST.Body) | |
// Remove braces {} enclosing the function body, unindent, | |
// and trim leading and trailing white space. | |
s := buf.String() | |
s = s[1 : len(s)-1] | |
s = strings.TrimSpace(strings.Replace(s, "\n\t", "\n", -1)) | |
// Print the cleaned-up body text to stdout. | |
fmt.Println(s) | |
// output: | |
// funcAST, fset := parseFunc("example_test.go", "ExampleFprint") | |
// | |
// var buf bytes.Buffer | |
// printer.Fprint(&buf, fset, funcAST.Body) | |
// | |
// s := buf.String() | |
// s = s[1 : len(s)-1] | |
// s = strings.TrimSpace(strings.Replace(s, "\n\t", "\n", -1)) | |
// | |
// fmt.Println(s) | |
} | |
func main() { | |
ExampleFprint() | |
} |
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