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 = 5
// udts = 0
// opcodes = 14
// --- ABNF original opcodes
// ALT = 1
// CAT = 3
// REP = 0
// RNM = 4
// TLS = 4
// TBS = 0
// TRG = 0
// --- SABNF superset opcodes
// UDT = 0
// AND = 0
// NOT = 0
// BKA = 0
// BKN = 0
// BKR = 2
// ABG = 0
// AEN = 0
// characters = [97 - 121]
// ```
/* OBJECT IDENTIFIER (for internal parser use) */
this.grammarObject = 'grammarObject';
/* RULES */
this.rules = [];
this.rules[0] = { name: 'rule', lower: 'rule', index: 0, isBkr: false };
this.rules[1] = { name: 'A', lower: 'a', index: 1, isBkr: true };
this.rules[2] = { name: 'B', lower: 'b', index: 2, isBkr: false };
this.rules[3] = { name: 'X', lower: 'x', index: 3, isBkr: true };
this.rules[4] = { name: 'Y', lower: 'y', index: 4, isBkr: false };
/* UDTS */
this.udts = [];
/* OPCODES */
/* rule */
this.rules[0].opcodes = [];
this.rules[0].opcodes[0] = { type: 2, children: [1,8,9] };// CAT
this.rules[0].opcodes[1] = { type: 1, children: [2,5] };// ALT
this.rules[0].opcodes[2] = { type: 2, children: [3,4] };// CAT
this.rules[0].opcodes[3] = { type: 4, index: 1 };// RNM(A)
this.rules[0].opcodes[4] = { type: 4, index: 2 };// RNM(B)
this.rules[0].opcodes[5] = { type: 2, children: [6,7] };// CAT
this.rules[0].opcodes[6] = { type: 4, index: 3 };// RNM(X)
this.rules[0].opcodes[7] = { type: 4, index: 4 };// RNM(Y)
this.rules[0].opcodes[8] = { type: 14, index: 3, lower: 'x', bkrCase: 604, bkrMode: 601 };// BKR(\%i%uX)
this.rules[0].opcodes[9] = { type: 14, index: 1, lower: 'a', bkrCase: 604, bkrMode: 601 };// BKR(\%i%uA)
/* A */
this.rules[1].opcodes = [];
this.rules[1].opcodes[0] = { type: 7, string: [97] };// TLS
/* B */
this.rules[2].opcodes = [];
this.rules[2].opcodes[0] = { type: 7, string: [98] };// TLS
/* X */
this.rules[3].opcodes = [];
this.rules[3].opcodes[0] = { type: 7, string: [97] };// TLS
/* Y */
this.rules[4].opcodes = [];
this.rules[4].opcodes[0] = { type: 7, string: [121] };// TLS
// The `toString()` function will display the original grammar file(s) that produced these opcodes.
this.toString = function toString(){
let str = "";
str += "rule = ( (A B) / (X Y) ) \\X \\A\n";
str += "A = \"a\"\n";
str += "B = \"b\"\n";
str += "X = \"a\"\n";
str += "Y = \"y\"\n";
return str;
}
}