diff options
| -rw-r--r-- | README.md | 47 | ||||
| -rw-r--r-- | cmd/vartan/show.go (renamed from cmd/vartan/describe.go) | 10 |
2 files changed, 51 insertions, 6 deletions
@@ -76,4 +76,49 @@ When `vartan parse` command successfully parses the input data, it prints a CST ## Debug -`vartan compile` command also generates a description file having `.desc` suffix along with a parsing table. This file describes each state in the parsing table in detail. If your grammar contains conflicts, see `Conflicts` section of this file. +`vartan compile` command also generates a description file having `-description.json` suffix along with a parsing table. This file describes each state in the parsing table in detail. If your grammar contains conflicts, see `Conflicts` and `States` sections of this file. Using `vartan show` command, you can see the description file in a readable format. + +```sh +$ vartan show expr-description.json +# Class + +LALR(1) + +# Conflicts + +No conflict was detected. + +# Terminals + + 1 - - <eof> + 2 - - error + 3 - - whitespaces + 4 - - number + 5 - - id + 6 - - add_op (+) + 7 - - mul_op (*) + +# Productions + + 1 - - expr' → expr + 2 - - expr → expr + term + 3 - - expr → term + 4 - - term → term * factor + 5 - - term → factor + 6 - - factor → number + 7 - - factor → id + +# States + +## State 0 + + 1 expr' → ・ expr + +shift 4 on number +shift 5 on id +goto 1 on expr +goto 2 on term +goto 3 on factor + +... +``` diff --git a/cmd/vartan/describe.go b/cmd/vartan/show.go index 2dabf9f..920ba66 100644 --- a/cmd/vartan/describe.go +++ b/cmd/vartan/show.go @@ -14,21 +14,21 @@ import ( "github.com/spf13/cobra" ) -var describeFlags = struct { +var showFlags = struct { }{} func init() { cmd := &cobra.Command{ - Use: "describe", + Use: "show", Short: "Print a description file in readable format", - Example: ` vartan describe grammar-description.json`, + Example: ` vartan show grammar-description.json`, Args: cobra.ExactArgs(1), - RunE: runDescribe, + RunE: runShow, } rootCmd.AddCommand(cmd) } -func runDescribe(cmd *cobra.Command, args []string) (retErr error) { +func runShow(cmd *cobra.Command, args []string) (retErr error) { defer func() { panicked := false v := recover() |