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Check input files and handle panic condition

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This commit is contained in:
Grant Murphy 2016-07-22 11:05:05 -07:00
parent e2caa921fe
commit 0bd254c2eb
1 changed files with 14 additions and 1 deletions
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15
tools.go
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@ -19,6 +19,7 @@ import (
"go/ast" "go/ast"
"go/parser" "go/parser"
"go/token" "go/token"
"os"
"strings" "strings"
) )
@ -64,11 +65,23 @@ func (u *utilities) run(args ...string) {
func dumpAst(files ...string) { func dumpAst(files ...string) {
for _, arg := range files { for _, arg := range files {
// Ensure file exists and not a directory
st, e := os.Stat(arg)
if e != nil {
fmt.Fprintf(os.Stderr, "Skipping: %s - %s\n", arg, e)
continue
}
if st.IsDir() {
fmt.Fprintf(os.Stderr, "Skipping: %s - directory\n", arg)
continue
}
// Create the AST by parsing src. // Create the AST by parsing src.
fset := token.NewFileSet() // positions are relative to fset fset := token.NewFileSet() // positions are relative to fset
f, err := parser.ParseFile(fset, arg, nil, 0) f, err := parser.ParseFile(fset, arg, nil, 0)
if err != nil { if err != nil {
panic(err) fmt.Fprintf(os.Stderr, "Unable to parse file %s\n", err)
continue
} }
// Print the AST. // Print the AST.