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cmd/goyacc: add flags for enabling debug and verbose error messages #304

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cmd/goyacc: add flags for enabling debug and verbose error messages #304

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12 changes: 9 additions & 3 deletions cmd/goyacc/yacc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -159,13 +159,17 @@ var fmtImported bool // output file has recorded an import of "fmt"
var oflag string // -o [y.go] - y.go file
var vflag string // -v [y.output] - y.output file
var lflag bool // -l - disable line directives
var tflag int // -t - set debug message level
var eflag bool // -e - enable verbose error messages
var prefix string // name prefix for identifiers, default yy

func init() {
flag.StringVar(&oflag, "o", "y.go", "parser output")
flag.StringVar(&prefix, "p", "yy", "name prefix to use in generated code")
flag.StringVar(&vflag, "v", "y.output", "create parsing tables")
flag.BoolVar(&lflag, "l", false, "disable line directives")
flag.IntVar(&tflag, "t", 0, "set debug message level")
flag.BoolVar(&eflag, "e", false, "enable verbose error messages")
}

var initialstacksize = 16
Expand Down Expand Up @@ -385,6 +389,8 @@ func setup() {
usage()
}
yaccpar = strings.Replace(yaccpartext, "$$", prefix, -1)
yaccpar = strings.Replace(yaccpar, "$tflag", strconv.Itoa(tflag), 1)
yaccpar = strings.Replace(yaccpar, "$eflag", strconv.FormatBool(eflag), 1)
openup()

fmt.Fprintf(ftable, "// Code generated by goyacc %s. DO NOT EDIT.\n", strings.Join(os.Args[1:], " "))
Expand Down Expand Up @@ -3094,7 +3100,7 @@ func chcopy(q string) string {
}

func usage() {
fmt.Fprintf(stderr, "usage: yacc [-o output] [-v parsetable] input\n")
fmt.Fprintf(stderr, "usage: yacc [-o output] [-v parsetable] [-p prefix] [-l] [-e] [-t debuglevel] input\n")
exit(1)
}

Expand Down Expand Up @@ -3265,8 +3271,8 @@ var yaccpartext = `
/* parser for yacc output */

var (
$$Debug = 0
$$ErrorVerbose = false
$$Debug = $tflag
$$ErrorVerbose = $eflag
)

type $$Lexer interface {
Expand Down