https://github.com/prataprc/monster

A Production system in Go.
https://github.com/prataprc/monster

generator golang grammar

Last synced: about 2 hours ago
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A Production system in Go.

• Host: GitHub
• URL: https://github.com/prataprc/monster
• Owner: prataprc
• License: apache-2.0
• Created: 2013-07-29T07:16:18.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2021-02-10T11:22:14.000Z (almost 4 years ago)
• Last Synced: 2024-06-19T11:27:10.142Z (5 months ago)
• Topics: generator, golang, grammar
• Language: Go
• Size: 2.06 MB
• Stars: 13
• Watchers: 4
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
README

======

Monster is a grammar based production tool. At present I am using this to

generate json documents using production grammar.

Can be invoked via command-line like,

```bash

$ go run monster/monster.go -h

	  -bagdir="": directory path containing bags

	  -n=1: generate n combinations

	  -nonterm="": evaluate the non-terminal

	  -o="-": specify an output file

	  -seed=37: seed value

```

Example production grammar, that generate randomized json documents.

```bnf

s 		   : value.

object     : "{" properties "}".

properties : properties "," property

		   | property.

property   : DQ (bag "./web2") DQ ":" value.

array      : "[" values "]".

values     : value "," value

		   | (weigh 0.8 0.2) values.

value      : (weigh 0.1) basic

		   | (weigh 0.45 0.1) array

		   | (weigh 0.45 0.1) object.

basic      : "true"

		   | "false"

		   | "null"

		   | number

		   | string.

string     : DQ (bag "./web2") DQ.

number     : (range 0 100000)

		   | (rangef 0.0 100.0).

```

The grammar can be invoked via command line like,

```bash

go run monster/monster.go -bagdir ./bags -n 10 ./prods/json.prod

```

use `-n` switch to generate as many document as needed, documents will be output

to stdout by default, to redirect them to a file use `-o` switch.

different commands to debug monster,

```bash

// To generate GCTRACE.

GCDEBUG=gctrace=2 go run monster/monster.go -bagdir bags -count 1000000 -o o prods/users.prod

// To generate mem-profile.

go run monster/monster.go -bagdir bags -count 1000000 -memprof apr21.1.mprof -o o prods/users.prod

// To analyse alloc-space.

go tool pprof --svg --alloc_space monster/monster apr21.1.mprof > apr21.1.mprof.alloc.svg

```