diff options
Diffstat (limited to 'cmd/vartan/parse.go')
| -rw-r--r-- | cmd/vartan/parse.go | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/cmd/vartan/parse.go b/cmd/vartan/parse.go index 1311ce6..d5e3d36 100644 --- a/cmd/vartan/parse.go +++ b/cmd/vartan/parse.go @@ -12,8 +12,9 @@ import ( ) var parseFlags = struct { - source *string - cst *bool + source *string + onlyParse *bool + cst *bool }{} func init() { @@ -25,6 +26,7 @@ func init() { RunE: runParse, } parseFlags.source = cmd.Flags().StringP("source", "s", "", "source file path (default stdin)") + parseFlags.onlyParse = cmd.Flags().Bool("only-parse", false, "when this option is enabled, the parser performs only parse and doesn't semantic actions") parseFlags.cst = cmd.Flags().Bool("cst", false, "when this option is enabled, the parser generates a CST") rootCmd.AddCommand(cmd) } @@ -48,6 +50,10 @@ func runParse(cmd *cobra.Command, args []string) (retErr error) { } }() + if *parseFlags.onlyParse && *parseFlags.cst { + return fmt.Errorf("You cannot enable --only-parse and --cst at the same time") + } + cgram, err := readCompiledGrammar(args[0]) if err != nil { return fmt.Errorf("Cannot read a compiled grammar: %w", err) @@ -66,9 +72,10 @@ func runParse(cmd *cobra.Command, args []string) (retErr error) { } var opts []driver.ParserOption - if *parseFlags.cst { + switch { + case *parseFlags.cst: opts = append(opts, driver.MakeCST()) - } else { + case !*parseFlags.onlyParse: opts = append(opts, driver.MakeAST()) } p, err = driver.NewParser(cgram, src, opts...) @@ -82,14 +89,17 @@ func runParse(cmd *cobra.Command, args []string) (retErr error) { return err } - var tree *driver.Node - if *parseFlags.cst { - tree = p.CST() - } else { - tree = p.AST() - } fmt.Printf("Accepted\n") - driver.PrintTree(os.Stdout, tree) + + if !*parseFlags.onlyParse { + var tree *driver.Node + if *parseFlags.cst { + tree = p.CST() + } else { + tree = p.AST() + } + driver.PrintTree(os.Stdout, tree) + } return nil } |