31 lines
1.0 KiB
JavaScript
31 lines
1.0 KiB
JavaScript
import { isSymbolNode } from '../../../utils/is.js';
|
|
import { createSubScope } from '../../../utils/scope.js';
|
|
/**
|
|
* Compile an inline expression like "x > 0"
|
|
* @param {Node} expression
|
|
* @param {Object} math
|
|
* @param {Object} scope
|
|
* @return {function} Returns a function with one argument which fills in the
|
|
* undefined variable (like "x") and evaluates the expression
|
|
*/
|
|
|
|
export function compileInlineExpression(expression, math, scope) {
|
|
// find an undefined symbol
|
|
var symbol = expression.filter(function (node) {
|
|
return isSymbolNode(node) && !(node.name in math) && !scope.has(node.name);
|
|
})[0];
|
|
|
|
if (!symbol) {
|
|
throw new Error('No undefined variable found in inline expression "' + expression + '"');
|
|
} // create a test function for this equation
|
|
|
|
|
|
var name = symbol.name; // variable name
|
|
|
|
var subScope = createSubScope(scope);
|
|
var eq = expression.compile();
|
|
return function inlineExpression(x) {
|
|
subScope.set(name, x);
|
|
return eq.evaluate(subScope);
|
|
};
|
|
} |