87 lines
2.4 KiB
JavaScript
87 lines
2.4 KiB
JavaScript
import SimpleSchema from 'simpl-schema';
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import VARIABLE_NAME_REGEX from '/imports/constants/VARIABLE_NAME_REGEX.js';
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import ErrorSchema from '/imports/api/properties/subSchemas/ErrorSchema.js';
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import {
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parse,
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prettifyParseError,
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} from '/imports/parser/parser.js';
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import STORAGE_LIMITS from '/imports/constants/STORAGE_LIMITS.js';
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import resolve, { Context, traverse } from '/imports/parser/resolve.js';
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/*
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* Constants are primitive values that can be used elsewhere in computations
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*/
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let ConstantSchema = new SimpleSchema({
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name: {
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type: String,
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optional: true,
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max: STORAGE_LIMITS.name,
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},
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// The technical, lowercase, single-word name used in formulae
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variableName: {
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type: String,
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regEx: VARIABLE_NAME_REGEX,
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min: 2,
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defaultValue: 'newConstant',
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max: STORAGE_LIMITS.variableName,
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},
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// The input value to be parsed, must return a constant node or an array
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// of constant nodes to be valid
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calculation: {
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type: String,
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optional: true,
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max: STORAGE_LIMITS.calculation,
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},
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errors: {
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type: Array,
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maxCount: STORAGE_LIMITS.errorCount,
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autoValue(){
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let calc = this.field('calculation');
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if (!calc.isSet && this.isModifier) {
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this.unset()
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return;
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}
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let string = calc.value;
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if (!string) return [];
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// Evaluate the calculation with no scope
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let {result, context} = parseString(string);
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// Any existing errors will result in an early failure
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if (context && context.errors.length) return context.errors;
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// Ban variables in constants if necessary
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result && traverse(result, node => {
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if (node.parseType === 'symbol' || node.parseType === 'accessor'){
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context.error('Variables can\'t be used to define a constant');
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}
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});
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return context && context.errors || [];
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}
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},
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'errors.$':{
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type: ErrorSchema,
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},
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});
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function parseString(string, fn = 'compile'){
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let context = new Context();
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if (!string){
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return {result: string, context};
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}
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// Parse the string using mathjs
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let node;
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try {
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node = parse(string);
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} catch (e) {
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let message = prettifyParseError(e);
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context.error(message);
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return {context};
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}
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if (!node) return {context};
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let {result} = resolve(fn, node, {/*empty scope*/}, context);
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return {result, context}
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}
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const ComputedOnlyConstantSchema = new SimpleSchema({});
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export { ConstantSchema, ComputedOnlyConstantSchema };
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