vpegu/json.peg at master · yaskhan/vpegu · GitHub

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# JSON Grammar for PEG Parser
# Based on standard JSON specification

package json

import "os"

type Json Peg {
    // JSON parser type
}

# Entry point
Value <- String / Number / Object / Array / "true" / "false" / "null"

# String with escape sequences
#String <- '"' (![\\"] . / Escape)* '"'
String <- '"' (![\\"] .)* '"'

# Escape sequences
#Escape <- "\\" (
#    "\"" / "\\" / "/" /
#    "b" / "f" / "n" / "r" / "t" /
#    "u" Hex Hex Hex Hex
#)

# Hexadecimal digit
Hex <- [0-9a-fA-F]

# Number (integer or decimal)
Number <- '-'? Integer ('.' [0-9]+)? ([eE] [-+]? [0-9]+)?

Integer <- '0' / [1-9] [0-9]*

# Object
Object <- '{' (String ':' Value (',' String ':' Value)*)? '}'

# Array
Array <- '[' (Value (',' Value)*)? ']'