77 lines
1.9 KiB
JavaScript
77 lines
1.9 KiB
JavaScript
import { Reduction_Scanner, Reduction_Settings } from '@efforting.tech/rule-processing/reduction-scanner';
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import * as R from '@efforting.tech/rule-processing/rules';
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import { inspect } from 'node:util';
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class Rule { //NOTE: This is somewhat of a place holder because we may want to declare specific transformations later rather than always having an opaque handler function
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constructor(condition, handler) {
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Object.assign(this, { condition, handler });
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}
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get match() {
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return this.condition.match.bind(this.condition);
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}
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get action() {
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return this.handler;
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}
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}
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function sequence_rule(sequence, transform_fn) {
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return new Rule(
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new R.Sequence_Condition(sequence),
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(rs, sequence, match) => {
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const MS = match.match_start;
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const ME = match.match_end;
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sequence.splice(MS, ME - MS + 1, transform_fn(...sequence.slice(MS, ME + 1)));
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}
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);
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}
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const N = new R.Predicate((i) => typeof i === 'number' || i.type == 'BINOP' );
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const ASTERISK = new R.Strict_Equality('*');
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const PLUS = new R.Strict_Equality('+');
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const HAT = new R.Strict_Equality('^');
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const rss = Reduction_Settings.load({
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// Switching this on or off affects whether add comes before mul or not
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//reduction_order: 'POSITION_MAJOR',
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});
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const rs = new Reduction_Scanner(rss);
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rss.rules.push(
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sequence_rule([N, HAT, N], (left, op, right) => ({ type: 'BINOP', op: 'HAT', operands: [left, right]})),
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sequence_rule([N, ASTERISK, N], (left, op, right) => ({ type: 'BINOP', op: 'ASTERISK', operands: [left, right]})),
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sequence_rule([N, PLUS, N], (left, op, right) => ({ type: 'BINOP', op: 'PLUS', operands: [left, right]})),
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);
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const arr = [10, '^', 5, '+', 20, '*', 30];
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console.log(inspect(rs.transform(arr), { colors: true, depth: null }));
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/* OUTPUT
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[
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{
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type: 'BINOP',
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op: 'PLUS',
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operands: [
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{ type: 'BINOP', op: 'HAT', operands: [ 10, 5 ] },
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{ type: 'BINOP', op: 'ASTERISK', operands: [ 20, 30 ] }
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]
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}
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]
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*/
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