apg-js-examples
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Examples of using the suite of apg-js applications and libraries.
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JavaScript
// copyright: Copyright (c) 2024 Lowell D. Thomas, all rights reserved<br>
// license: BSD-2-Clause (https://opensource.org/licenses/BSD-2-Clause)<br>
//
// Generated by apg-js, Version 4.4.0 [apg-js](https://github.com/ldthomas/apg-js)
module.exports = function grammar(){
// ```
// SUMMARY
// rules = 6
// udts = 0
// opcodes = 16
// --- ABNF original opcodes
// ALT = 1
// CAT = 2
// REP = 3
// RNM = 7
// TLS = 1
// TBS = 0
// TRG = 1
// --- SABNF superset opcodes
// UDT = 0
// AND = 0
// NOT = 0
// BKA = 0
// BKN = 1
// BKR = 0
// ABG = 0
// AEN = 0
// characters = [32 - 126]
// ```
/* OBJECT IDENTIFIER (for internal parser use) */
this.grammarObject = 'grammarObject';
/* RULES */
this.rules = [];
this.rules[0] = { name: 'line', lower: 'line', index: 0, isBkr: false };
this.rules[1] = { name: 'begin-comment', lower: 'begin-comment', index: 1, isBkr: false };
this.rules[2] = { name: 'text', lower: 'text', index: 2, isBkr: false };
this.rules[3] = { name: 'comment-text', lower: 'comment-text', index: 3, isBkr: false };
this.rules[4] = { name: 'other-text', lower: 'other-text', index: 4, isBkr: false };
this.rules[5] = { name: 'vchar', lower: 'vchar', index: 5, isBkr: false };
/* UDTS */
this.udts = [];
/* OPCODES */
/* line */
this.rules[0].opcodes = [];
this.rules[0].opcodes[0] = { type: 2, children: [1,3] };// CAT
this.rules[0].opcodes[1] = { type: 3, min: 0, max: 1 };// REP
this.rules[0].opcodes[2] = { type: 4, index: 1 };// RNM(begin-comment)
this.rules[0].opcodes[3] = { type: 4, index: 2 };// RNM(text)
/* begin-comment */
this.rules[1].opcodes = [];
this.rules[1].opcodes[0] = { type: 7, string: [47,47] };// TLS
/* text */
this.rules[2].opcodes = [];
this.rules[2].opcodes[0] = { type: 1, children: [1,2] };// ALT
this.rules[2].opcodes[1] = { type: 4, index: 4 };// RNM(other-text)
this.rules[2].opcodes[2] = { type: 4, index: 3 };// RNM(comment-text)
/* comment-text */
this.rules[3].opcodes = [];
this.rules[3].opcodes[0] = { type: 3, min: 1, max: Infinity };// REP
this.rules[3].opcodes[1] = { type: 4, index: 5 };// RNM(vchar)
/* other-text */
this.rules[4].opcodes = [];
this.rules[4].opcodes[0] = { type: 2, children: [1,3] };// CAT
this.rules[4].opcodes[1] = { type: 16 };// BKN
this.rules[4].opcodes[2] = { type: 4, index: 1 };// RNM(begin-comment)
this.rules[4].opcodes[3] = { type: 3, min: 1, max: Infinity };// REP
this.rules[4].opcodes[4] = { type: 4, index: 5 };// RNM(vchar)
/* vchar */
this.rules[5].opcodes = [];
this.rules[5].opcodes[0] = { type: 5, min: 32, max: 126 };// TRG
// The `toString()` function will display the original grammar file(s) that produced these opcodes.
this.toString = function toString(){
let str = "";
str += "line = [begin-comment] text\n";
str += "begin-comment = \"//\"\n";
str += "text = other-text / comment-text\n";
str += "comment-text = 1*vchar\n";
str += "other-text = !!begin-comment 1*vchar\n";
str += "vchar = %d32-126\n";
return str;
}
}