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 = 12
// udts = 0
// opcodes = 43
// --- ABNF original opcodes
// ALT = 2
// CAT = 9
// REP = 5
// RNM = 17
// TLS = 6
// TBS = 1
// TRG = 3
// --- SABNF superset opcodes
// UDT = 0
// AND = 0
// NOT = 0
// BKA = 0
// BKN = 0
// BKR = 0
// ABG = 0
// AEN = 0
// characters = [32 - 116]
// ```
/* OBJECT IDENTIFIER (for internal parser use) */
this.grammarObject = 'grammarObject';
/* RULES */
this.rules = [];
this.rules[0] = { name: 'stmt', lower: 'stmt', index: 0, isBkr: false };
this.rules[1] = { name: 'if-stmt', lower: 'if-stmt', index: 1, isBkr: false };
this.rules[2] = { name: 'if', lower: 'if', index: 2, isBkr: false };
this.rules[3] = { name: 'then', lower: 'then', index: 3, isBkr: false };
this.rules[4] = { name: 'else', lower: 'else', index: 4, isBkr: false };
this.rules[5] = { name: 'expr', lower: 'expr', index: 5, isBkr: false };
this.rules[6] = { name: 'other-stmt', lower: 'other-stmt', index: 6, isBkr: false };
this.rules[7] = { name: 'other-else', lower: 'other-else', index: 7, isBkr: false };
this.rules[8] = { name: 'if-word', lower: 'if-word', index: 8, isBkr: false };
this.rules[9] = { name: 'then-word', lower: 'then-word', index: 9, isBkr: false };
this.rules[10] = { name: 'else-word', lower: 'else-word', index: 10, isBkr: false };
this.rules[11] = { name: 'sep', lower: 'sep', index: 11, isBkr: false };
/* UDTS */
this.udts = [];
/* OPCODES */
/* stmt */
this.rules[0].opcodes = [];
this.rules[0].opcodes[0] = { type: 1, children: [1,2] };// ALT
this.rules[0].opcodes[1] = { type: 4, index: 1 };// RNM(if-stmt)
this.rules[0].opcodes[2] = { type: 4, index: 6 };// RNM(other-stmt)
/* if-stmt */
this.rules[1].opcodes = [];
this.rules[1].opcodes[0] = { type: 2, children: [1,5,7] };// CAT
this.rules[1].opcodes[1] = { type: 2, children: [2,3,4] };// CAT
this.rules[1].opcodes[2] = { type: 4, index: 2 };// RNM(if)
this.rules[1].opcodes[3] = { type: 4, index: 5 };// RNM(expr)
this.rules[1].opcodes[4] = { type: 4, index: 3 };// RNM(then)
this.rules[1].opcodes[5] = { type: 3, min: 0, max: 1 };// REP
this.rules[1].opcodes[6] = { type: 4, index: 1 };// RNM(if-stmt)
this.rules[1].opcodes[7] = { type: 1, children: [8,11] };// ALT
this.rules[1].opcodes[8] = { type: 2, children: [9,10] };// CAT
this.rules[1].opcodes[9] = { type: 4, index: 4 };// RNM(else)
this.rules[1].opcodes[10] = { type: 4, index: 0 };// RNM(stmt)
this.rules[1].opcodes[11] = { type: 4, index: 7 };// RNM(other-else)
/* if */
this.rules[2].opcodes = [];
this.rules[2].opcodes[0] = { type: 2, children: [1,2] };// CAT
this.rules[2].opcodes[1] = { type: 4, index: 8 };// RNM(if-word)
this.rules[2].opcodes[2] = { type: 4, index: 11 };// RNM(sep)
/* then */
this.rules[3].opcodes = [];
this.rules[3].opcodes[0] = { type: 2, children: [1,2,3] };// CAT
this.rules[3].opcodes[1] = { type: 4, index: 11 };// RNM(sep)
this.rules[3].opcodes[2] = { type: 4, index: 9 };// RNM(then-word)
this.rules[3].opcodes[3] = { type: 4, index: 11 };// RNM(sep)
/* else */
this.rules[4].opcodes = [];
this.rules[4].opcodes[0] = { type: 2, children: [1,2,3] };// CAT
this.rules[4].opcodes[1] = { type: 4, index: 11 };// RNM(sep)
this.rules[4].opcodes[2] = { type: 4, index: 10 };// RNM(else-word)
this.rules[4].opcodes[3] = { type: 4, index: 11 };// RNM(sep)
/* expr */
this.rules[5].opcodes = [];
this.rules[5].opcodes[0] = { type: 2, children: [1,2] };// CAT
this.rules[5].opcodes[1] = { type: 7, string: [101] };// TLS
this.rules[5].opcodes[2] = { type: 3, min: 0, max: Infinity };// REP
this.rules[5].opcodes[3] = { type: 5, min: 48, max: 57 };// TRG
/* other-stmt */
this.rules[6].opcodes = [];
this.rules[6].opcodes[0] = { type: 2, children: [1,2] };// CAT
this.rules[6].opcodes[1] = { type: 7, string: [115] };// TLS
this.rules[6].opcodes[2] = { type: 3, min: 0, max: Infinity };// REP
this.rules[6].opcodes[3] = { type: 5, min: 48, max: 57 };// TRG
/* other-else */
this.rules[7].opcodes = [];
this.rules[7].opcodes[0] = { type: 2, children: [1,2] };// CAT
this.rules[7].opcodes[1] = { type: 7, string: [115] };// TLS
this.rules[7].opcodes[2] = { type: 3, min: 0, max: Infinity };// REP
this.rules[7].opcodes[3] = { type: 5, min: 48, max: 57 };// TRG
/* if-word */
this.rules[8].opcodes = [];
this.rules[8].opcodes[0] = { type: 7, string: [105,102] };// TLS
/* then-word */
this.rules[9].opcodes = [];
this.rules[9].opcodes[0] = { type: 7, string: [116,104,101,110] };// TLS
/* else-word */
this.rules[10].opcodes = [];
this.rules[10].opcodes[0] = { type: 7, string: [101,108,115,101] };// TLS
/* sep */
this.rules[11].opcodes = [];
this.rules[11].opcodes[0] = { type: 3, min: 1, max: Infinity };// REP
this.rules[11].opcodes[1] = { type: 6, string: [32] };// TBS
// The `toString()` function will display the original grammar file(s) that produced these opcodes.
this.toString = function toString(){
let str = "";
str += "stmt = if-stmt / other-stmt\n";
str += "if-stmt = (if expr then) [if-stmt] (else stmt / other-else)\n";
str += "if = if-word sep\n";
str += "then = sep then-word sep\n";
str += "else = sep else-word sep\n";
str += "expr = \"E\" *%d48-57\n";
str += "other-stmt = \"S\" *%d48-57\n";
str += "other-else = \"S\" *%d48-57\n";
str += "if-word = \"if\"\n";
str += "then-word = \"then\"\n";
str += "else-word = \"else\"\n";
str += "sep = 1*%d32\n";
return str;
}
}