1811 lines
48 KiB
JavaScript
1811 lines
48 KiB
JavaScript
"use strict";
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var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.createParse = void 0;
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var _extends2 = _interopRequireDefault(require("@babel/runtime/helpers/extends"));
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var _factory = require("../utils/factory.js");
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var _is = require("../utils/is.js");
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var _collection = require("../utils/collection.js");
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var _object = require("../utils/object.js");
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var name = 'parse';
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var dependencies = ['typed', 'numeric', 'config', 'AccessorNode', 'ArrayNode', 'AssignmentNode', 'BlockNode', 'ConditionalNode', 'ConstantNode', 'FunctionAssignmentNode', 'FunctionNode', 'IndexNode', 'ObjectNode', 'OperatorNode', 'ParenthesisNode', 'RangeNode', 'RelationalNode', 'SymbolNode'];
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var createParse = /* #__PURE__ */(0, _factory.factory)(name, dependencies, function (_ref) {
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var typed = _ref.typed,
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numeric = _ref.numeric,
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config = _ref.config,
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AccessorNode = _ref.AccessorNode,
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ArrayNode = _ref.ArrayNode,
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AssignmentNode = _ref.AssignmentNode,
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BlockNode = _ref.BlockNode,
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ConditionalNode = _ref.ConditionalNode,
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ConstantNode = _ref.ConstantNode,
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FunctionAssignmentNode = _ref.FunctionAssignmentNode,
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FunctionNode = _ref.FunctionNode,
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IndexNode = _ref.IndexNode,
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ObjectNode = _ref.ObjectNode,
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OperatorNode = _ref.OperatorNode,
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ParenthesisNode = _ref.ParenthesisNode,
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RangeNode = _ref.RangeNode,
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RelationalNode = _ref.RelationalNode,
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SymbolNode = _ref.SymbolNode;
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/**
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* Parse an expression. Returns a node tree, which can be evaluated by
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* invoking node.evaluate().
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*
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* Note the evaluating arbitrary expressions may involve security risks,
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* see [https://mathjs.org/docs/expressions/security.html](https://mathjs.org/docs/expressions/security.html) for more information.
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*
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* Syntax:
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*
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* math.parse(expr)
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* math.parse(expr, options)
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* math.parse([expr1, expr2, expr3, ...])
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* math.parse([expr1, expr2, expr3, ...], options)
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*
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* Example:
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*
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* const node1 = math.parse('sqrt(3^2 + 4^2)')
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* node1.compile().evaluate() // 5
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*
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* let scope = {a:3, b:4}
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* const node2 = math.parse('a * b') // 12
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* const code2 = node2.compile()
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* code2.evaluate(scope) // 12
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* scope.a = 5
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* code2.evaluate(scope) // 20
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*
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* const nodes = math.parse(['a = 3', 'b = 4', 'a * b'])
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* nodes[2].compile().evaluate() // 12
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*
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* See also:
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*
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* evaluate, compile
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*
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* @param {string | string[] | Matrix} expr Expression to be parsed
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* @param {{nodes: Object<string, Node>}} [options] Available options:
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* - `nodes` a set of custom nodes
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* @return {Node | Node[]} node
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* @throws {Error}
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*/
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var parse = typed(name, {
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string: function string(expression) {
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return parseStart(expression, {});
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},
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'Array | Matrix': function ArrayMatrix(expressions) {
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return parseMultiple(expressions, {});
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},
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'string, Object': function stringObject(expression, options) {
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var extraNodes = options.nodes !== undefined ? options.nodes : {};
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return parseStart(expression, extraNodes);
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},
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'Array | Matrix, Object': parseMultiple
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});
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function parseMultiple(expressions) {
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var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
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var extraNodes = options.nodes !== undefined ? options.nodes : {}; // parse an array or matrix with expressions
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return (0, _collection.deepMap)(expressions, function (elem) {
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if (typeof elem !== 'string') throw new TypeError('String expected');
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return parseStart(elem, extraNodes);
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});
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} // token types enumeration
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var TOKENTYPE = {
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NULL: 0,
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DELIMITER: 1,
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NUMBER: 2,
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SYMBOL: 3,
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UNKNOWN: 4
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}; // map with all delimiters
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var DELIMITERS = {
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',': true,
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'(': true,
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')': true,
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'[': true,
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']': true,
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'{': true,
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'}': true,
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'"': true,
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'\'': true,
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';': true,
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'+': true,
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'-': true,
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'*': true,
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'.*': true,
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'/': true,
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'./': true,
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'%': true,
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'^': true,
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'.^': true,
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'~': true,
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'!': true,
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'&': true,
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'|': true,
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'^|': true,
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'=': true,
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':': true,
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'?': true,
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'==': true,
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'!=': true,
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'<': true,
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'>': true,
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'<=': true,
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'>=': true,
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'<<': true,
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'>>': true,
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'>>>': true
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}; // map with all named delimiters
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var NAMED_DELIMITERS = {
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mod: true,
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to: true,
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in: true,
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and: true,
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xor: true,
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or: true,
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not: true
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};
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var CONSTANTS = {
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true: true,
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false: false,
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null: null,
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undefined: undefined
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};
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var NUMERIC_CONSTANTS = ['NaN', 'Infinity'];
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function initialState() {
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return {
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extraNodes: {},
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// current extra nodes, must be careful not to mutate
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expression: '',
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// current expression
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comment: '',
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// last parsed comment
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index: 0,
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// current index in expr
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token: '',
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// current token
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tokenType: TOKENTYPE.NULL,
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// type of the token
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nestingLevel: 0,
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// level of nesting inside parameters, used to ignore newline characters
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conditionalLevel: null // when a conditional is being parsed, the level of the conditional is stored here
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};
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}
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/**
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* View upto `length` characters of the expression starting at the current character.
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*
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* @param {Object} state
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* @param {number} [length=1] Number of characters to view
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* @returns {string}
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* @private
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*/
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function currentString(state, length) {
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return state.expression.substr(state.index, length);
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}
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/**
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* View the current character. Returns '' if end of expression is reached.
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*
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* @param {Object} state
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* @returns {string}
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* @private
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*/
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function currentCharacter(state) {
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return currentString(state, 1);
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}
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/**
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* Get the next character from the expression.
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* The character is stored into the char c. If the end of the expression is
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* reached, the function puts an empty string in c.
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* @private
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*/
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function next(state) {
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state.index++;
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}
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/**
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* Preview the previous character from the expression.
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* @return {string} cNext
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* @private
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*/
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function prevCharacter(state) {
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return state.expression.charAt(state.index - 1);
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}
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/**
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* Preview the next character from the expression.
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* @return {string} cNext
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* @private
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*/
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function nextCharacter(state) {
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return state.expression.charAt(state.index + 1);
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}
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/**
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* Get next token in the current string expr.
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* The token and token type are available as token and tokenType
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* @private
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*/
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function getToken(state) {
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state.tokenType = TOKENTYPE.NULL;
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state.token = '';
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state.comment = ''; // skip over ignored characters:
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while (true) {
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// comments:
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if (currentCharacter(state) === '#') {
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while (currentCharacter(state) !== '\n' && currentCharacter(state) !== '') {
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state.comment += currentCharacter(state);
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next(state);
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}
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} // whitespace: space, tab, and newline when inside parameters
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if (parse.isWhitespace(currentCharacter(state), state.nestingLevel)) {
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next(state);
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} else {
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break;
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}
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} // check for end of expression
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if (currentCharacter(state) === '') {
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// token is still empty
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state.tokenType = TOKENTYPE.DELIMITER;
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return;
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} // check for new line character
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if (currentCharacter(state) === '\n' && !state.nestingLevel) {
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state.tokenType = TOKENTYPE.DELIMITER;
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state.token = currentCharacter(state);
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next(state);
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return;
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}
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var c1 = currentCharacter(state);
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var c2 = currentString(state, 2);
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var c3 = currentString(state, 3);
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if (c3.length === 3 && DELIMITERS[c3]) {
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state.tokenType = TOKENTYPE.DELIMITER;
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state.token = c3;
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next(state);
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next(state);
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next(state);
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return;
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} // check for delimiters consisting of 2 characters
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if (c2.length === 2 && DELIMITERS[c2]) {
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state.tokenType = TOKENTYPE.DELIMITER;
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state.token = c2;
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next(state);
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next(state);
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return;
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} // check for delimiters consisting of 1 character
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if (DELIMITERS[c1]) {
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state.tokenType = TOKENTYPE.DELIMITER;
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state.token = c1;
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next(state);
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return;
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} // check for a number
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if (parse.isDigitDot(c1)) {
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state.tokenType = TOKENTYPE.NUMBER; // check for binary, octal, or hex
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var _c = currentString(state, 2);
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if (_c === '0b' || _c === '0o' || _c === '0x') {
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state.token += currentCharacter(state);
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next(state);
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state.token += currentCharacter(state);
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next(state);
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while (parse.isHexDigit(currentCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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}
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if (currentCharacter(state) === '.') {
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// this number has a radix point
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state.token += '.';
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next(state); // get the digits after the radix
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while (parse.isHexDigit(currentCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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}
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} else if (currentCharacter(state) === 'i') {
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// this number has a word size suffix
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state.token += 'i';
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next(state); // get the word size
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while (parse.isDigit(currentCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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}
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}
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return;
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} // get number, can have a single dot
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if (currentCharacter(state) === '.') {
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state.token += currentCharacter(state);
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next(state);
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if (!parse.isDigit(currentCharacter(state))) {
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// this is no number, it is just a dot (can be dot notation)
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state.tokenType = TOKENTYPE.DELIMITER;
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return;
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}
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} else {
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while (parse.isDigit(currentCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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}
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if (parse.isDecimalMark(currentCharacter(state), nextCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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}
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}
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while (parse.isDigit(currentCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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} // check for exponential notation like "2.3e-4", "1.23e50" or "2e+4"
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if (currentCharacter(state) === 'E' || currentCharacter(state) === 'e') {
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if (parse.isDigit(nextCharacter(state)) || nextCharacter(state) === '-' || nextCharacter(state) === '+') {
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state.token += currentCharacter(state);
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next(state);
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if (currentCharacter(state) === '+' || currentCharacter(state) === '-') {
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state.token += currentCharacter(state);
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next(state);
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} // Scientific notation MUST be followed by an exponent
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if (!parse.isDigit(currentCharacter(state))) {
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throw createSyntaxError(state, 'Digit expected, got "' + currentCharacter(state) + '"');
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}
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while (parse.isDigit(currentCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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}
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if (parse.isDecimalMark(currentCharacter(state), nextCharacter(state))) {
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throw createSyntaxError(state, 'Digit expected, got "' + currentCharacter(state) + '"');
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}
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} else if (nextCharacter(state) === '.') {
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next(state);
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throw createSyntaxError(state, 'Digit expected, got "' + currentCharacter(state) + '"');
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}
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}
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return;
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} // check for variables, functions, named operators
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if (parse.isAlpha(currentCharacter(state), prevCharacter(state), nextCharacter(state))) {
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while (parse.isAlpha(currentCharacter(state), prevCharacter(state), nextCharacter(state)) || parse.isDigit(currentCharacter(state))) {
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state.token += currentCharacter(state);
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next(state);
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}
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if ((0, _object.hasOwnProperty)(NAMED_DELIMITERS, state.token)) {
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state.tokenType = TOKENTYPE.DELIMITER;
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} else {
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state.tokenType = TOKENTYPE.SYMBOL;
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}
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return;
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} // something unknown is found, wrong characters -> a syntax error
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state.tokenType = TOKENTYPE.UNKNOWN;
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while (currentCharacter(state) !== '') {
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state.token += currentCharacter(state);
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next(state);
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}
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throw createSyntaxError(state, 'Syntax error in part "' + state.token + '"');
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}
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/**
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* Get next token and skip newline tokens
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*/
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function getTokenSkipNewline(state) {
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do {
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getToken(state);
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} while (state.token === '\n'); // eslint-disable-line no-unmodified-loop-condition
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}
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/**
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* Open parameters.
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* New line characters will be ignored until closeParams(state) is called
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*/
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function openParams(state) {
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state.nestingLevel++;
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}
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/**
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* Close parameters.
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* New line characters will no longer be ignored
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*/
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function closeParams(state) {
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state.nestingLevel--;
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}
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/**
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* Checks whether the current character `c` is a valid alpha character:
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*
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* - A latin letter (upper or lower case) Ascii: a-z, A-Z
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* - An underscore Ascii: _
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* - A dollar sign Ascii: $
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* - A latin letter with accents Unicode: \u00C0 - \u02AF
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* - A greek letter Unicode: \u0370 - \u03FF
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* - A mathematical alphanumeric symbol Unicode: \u{1D400} - \u{1D7FF} excluding invalid code points
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*
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* The previous and next characters are needed to determine whether
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* this character is part of a unicode surrogate pair.
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*
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* @param {string} c Current character in the expression
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* @param {string} cPrev Previous character
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* @param {string} cNext Next character
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* @return {boolean}
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*/
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parse.isAlpha = function isAlpha(c, cPrev, cNext) {
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return parse.isValidLatinOrGreek(c) || parse.isValidMathSymbol(c, cNext) || parse.isValidMathSymbol(cPrev, c);
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};
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/**
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* Test whether a character is a valid latin, greek, or letter-like character
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* @param {string} c
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* @return {boolean}
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*/
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parse.isValidLatinOrGreek = function isValidLatinOrGreek(c) {
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return /^[a-zA-Z_$\u00C0-\u02AF\u0370-\u03FF\u2100-\u214F]$/.test(c);
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};
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/**
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* Test whether two given 16 bit characters form a surrogate pair of a
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* unicode math symbol.
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*
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* https://unicode-table.com/en/
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* https://www.wikiwand.com/en/Mathematical_operators_and_symbols_in_Unicode
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*
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* Note: In ES6 will be unicode aware:
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* https://stackoverflow.com/questions/280712/javascript-unicode-regexes
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* https://mathiasbynens.be/notes/es6-unicode-regex
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*
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* @param {string} high
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* @param {string} low
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* @return {boolean}
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*/
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parse.isValidMathSymbol = function isValidMathSymbol(high, low) {
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return /^[\uD835]$/.test(high) && /^[\uDC00-\uDFFF]$/.test(low) && /^[^\uDC55\uDC9D\uDCA0\uDCA1\uDCA3\uDCA4\uDCA7\uDCA8\uDCAD\uDCBA\uDCBC\uDCC4\uDD06\uDD0B\uDD0C\uDD15\uDD1D\uDD3A\uDD3F\uDD45\uDD47-\uDD49\uDD51\uDEA6\uDEA7\uDFCC\uDFCD]$/.test(low);
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};
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/**
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* Check whether given character c is a white space character: space, tab, or enter
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* @param {string} c
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* @param {number} nestingLevel
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* @return {boolean}
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*/
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parse.isWhitespace = function isWhitespace(c, nestingLevel) {
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// TODO: also take '\r' carriage return as newline? Or does that give problems on mac?
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return c === ' ' || c === '\t' || c === '\n' && nestingLevel > 0;
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};
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/**
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* Test whether the character c is a decimal mark (dot).
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* This is the case when it's not the start of a delimiter '.*', './', or '.^'
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* @param {string} c
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* @param {string} cNext
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* @return {boolean}
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*/
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|
|
parse.isDecimalMark = function isDecimalMark(c, cNext) {
|
|
return c === '.' && cNext !== '/' && cNext !== '*' && cNext !== '^';
|
|
};
|
|
/**
|
|
* checks if the given char c is a digit or dot
|
|
* @param {string} c a string with one character
|
|
* @return {boolean}
|
|
*/
|
|
|
|
|
|
parse.isDigitDot = function isDigitDot(c) {
|
|
return c >= '0' && c <= '9' || c === '.';
|
|
};
|
|
/**
|
|
* checks if the given char c is a digit
|
|
* @param {string} c a string with one character
|
|
* @return {boolean}
|
|
*/
|
|
|
|
|
|
parse.isDigit = function isDigit(c) {
|
|
return c >= '0' && c <= '9';
|
|
};
|
|
/**
|
|
* checks if the given char c is a hex digit
|
|
* @param {string} c a string with one character
|
|
* @return {boolean}
|
|
*/
|
|
|
|
|
|
parse.isHexDigit = function isHexDigit(c) {
|
|
return c >= '0' && c <= '9' || c >= 'a' && c <= 'f' || c >= 'A' && c <= 'F';
|
|
};
|
|
/**
|
|
* Start of the parse levels below, in order of precedence
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseStart(expression, extraNodes) {
|
|
var state = initialState();
|
|
(0, _extends2.default)(state, {
|
|
expression: expression,
|
|
extraNodes: extraNodes
|
|
});
|
|
getToken(state);
|
|
var node = parseBlock(state); // check for garbage at the end of the expression
|
|
// an expression ends with a empty character '' and tokenType DELIMITER
|
|
|
|
if (state.token !== '') {
|
|
if (state.tokenType === TOKENTYPE.DELIMITER) {
|
|
// user entered a not existing operator like "//"
|
|
// TODO: give hints for aliases, for example with "<>" give as hint " did you mean !== ?"
|
|
throw createError(state, 'Unexpected operator ' + state.token);
|
|
} else {
|
|
throw createSyntaxError(state, 'Unexpected part "' + state.token + '"');
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* Parse a block with expressions. Expressions can be separated by a newline
|
|
* character '\n', or by a semicolon ';'. In case of a semicolon, no output
|
|
* of the preceding line is returned.
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseBlock(state) {
|
|
var node;
|
|
var blocks = [];
|
|
var visible;
|
|
|
|
if (state.token !== '' && state.token !== '\n' && state.token !== ';') {
|
|
node = parseAssignment(state);
|
|
node.comment = state.comment;
|
|
} // TODO: simplify this loop
|
|
|
|
|
|
while (state.token === '\n' || state.token === ';') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
if (blocks.length === 0 && node) {
|
|
visible = state.token !== ';';
|
|
blocks.push({
|
|
node: node,
|
|
visible: visible
|
|
});
|
|
}
|
|
|
|
getToken(state);
|
|
|
|
if (state.token !== '\n' && state.token !== ';' && state.token !== '') {
|
|
node = parseAssignment(state);
|
|
node.comment = state.comment;
|
|
visible = state.token !== ';';
|
|
blocks.push({
|
|
node: node,
|
|
visible: visible
|
|
});
|
|
}
|
|
}
|
|
|
|
if (blocks.length > 0) {
|
|
return new BlockNode(blocks);
|
|
} else {
|
|
if (!node) {
|
|
node = new ConstantNode(undefined);
|
|
node.comment = state.comment;
|
|
}
|
|
|
|
return node;
|
|
}
|
|
}
|
|
/**
|
|
* Assignment of a function or variable,
|
|
* - can be a variable like 'a=2.3'
|
|
* - or a updating an existing variable like 'matrix(2,3:5)=[6,7,8]'
|
|
* - defining a function like 'f(x) = x^2'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseAssignment(state) {
|
|
var name, args, value, valid;
|
|
var node = parseConditional(state);
|
|
|
|
if (state.token === '=') {
|
|
if ((0, _is.isSymbolNode)(node)) {
|
|
// parse a variable assignment like 'a = 2/3'
|
|
name = node.name;
|
|
getTokenSkipNewline(state);
|
|
value = parseAssignment(state);
|
|
return new AssignmentNode(new SymbolNode(name), value);
|
|
} else if ((0, _is.isAccessorNode)(node)) {
|
|
// parse a matrix subset assignment like 'A[1,2] = 4'
|
|
getTokenSkipNewline(state);
|
|
value = parseAssignment(state);
|
|
return new AssignmentNode(node.object, node.index, value);
|
|
} else if ((0, _is.isFunctionNode)(node) && (0, _is.isSymbolNode)(node.fn)) {
|
|
// parse function assignment like 'f(x) = x^2'
|
|
valid = true;
|
|
args = [];
|
|
name = node.name;
|
|
node.args.forEach(function (arg, index) {
|
|
if ((0, _is.isSymbolNode)(arg)) {
|
|
args[index] = arg.name;
|
|
} else {
|
|
valid = false;
|
|
}
|
|
});
|
|
|
|
if (valid) {
|
|
getTokenSkipNewline(state);
|
|
value = parseAssignment(state);
|
|
return new FunctionAssignmentNode(name, args, value);
|
|
}
|
|
}
|
|
|
|
throw createSyntaxError(state, 'Invalid left hand side of assignment operator =');
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* conditional operation
|
|
*
|
|
* condition ? truePart : falsePart
|
|
*
|
|
* Note: conditional operator is right-associative
|
|
*
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseConditional(state) {
|
|
var node = parseLogicalOr(state);
|
|
|
|
while (state.token === '?') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
// set a conditional level, the range operator will be ignored as long
|
|
// as conditionalLevel === state.nestingLevel.
|
|
var prev = state.conditionalLevel;
|
|
state.conditionalLevel = state.nestingLevel;
|
|
getTokenSkipNewline(state);
|
|
var condition = node;
|
|
var trueExpr = parseAssignment(state);
|
|
if (state.token !== ':') throw createSyntaxError(state, 'False part of conditional expression expected');
|
|
state.conditionalLevel = null;
|
|
getTokenSkipNewline(state);
|
|
var falseExpr = parseAssignment(state); // Note: check for conditional operator again, right associativity
|
|
|
|
node = new ConditionalNode(condition, trueExpr, falseExpr); // restore the previous conditional level
|
|
|
|
state.conditionalLevel = prev;
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* logical or, 'x or y'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseLogicalOr(state) {
|
|
var node = parseLogicalXor(state);
|
|
|
|
while (state.token === 'or') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getTokenSkipNewline(state);
|
|
node = new OperatorNode('or', 'or', [node, parseLogicalXor(state)]);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* logical exclusive or, 'x xor y'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseLogicalXor(state) {
|
|
var node = parseLogicalAnd(state);
|
|
|
|
while (state.token === 'xor') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getTokenSkipNewline(state);
|
|
node = new OperatorNode('xor', 'xor', [node, parseLogicalAnd(state)]);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* logical and, 'x and y'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseLogicalAnd(state) {
|
|
var node = parseBitwiseOr(state);
|
|
|
|
while (state.token === 'and') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getTokenSkipNewline(state);
|
|
node = new OperatorNode('and', 'and', [node, parseBitwiseOr(state)]);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* bitwise or, 'x | y'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseBitwiseOr(state) {
|
|
var node = parseBitwiseXor(state);
|
|
|
|
while (state.token === '|') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getTokenSkipNewline(state);
|
|
node = new OperatorNode('|', 'bitOr', [node, parseBitwiseXor(state)]);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* bitwise exclusive or (xor), 'x ^| y'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseBitwiseXor(state) {
|
|
var node = parseBitwiseAnd(state);
|
|
|
|
while (state.token === '^|') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getTokenSkipNewline(state);
|
|
node = new OperatorNode('^|', 'bitXor', [node, parseBitwiseAnd(state)]);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* bitwise and, 'x & y'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseBitwiseAnd(state) {
|
|
var node = parseRelational(state);
|
|
|
|
while (state.token === '&') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getTokenSkipNewline(state);
|
|
node = new OperatorNode('&', 'bitAnd', [node, parseRelational(state)]);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* Parse a chained conditional, like 'a > b >= c'
|
|
* @return {Node} node
|
|
*/
|
|
|
|
|
|
function parseRelational(state) {
|
|
var params = [parseShift(state)];
|
|
var conditionals = [];
|
|
var operators = {
|
|
'==': 'equal',
|
|
'!=': 'unequal',
|
|
'<': 'smaller',
|
|
'>': 'larger',
|
|
'<=': 'smallerEq',
|
|
'>=': 'largerEq'
|
|
};
|
|
|
|
while ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
var cond = {
|
|
name: state.token,
|
|
fn: operators[state.token]
|
|
};
|
|
conditionals.push(cond);
|
|
getTokenSkipNewline(state);
|
|
params.push(parseShift(state));
|
|
}
|
|
|
|
if (params.length === 1) {
|
|
return params[0];
|
|
} else if (params.length === 2) {
|
|
return new OperatorNode(conditionals[0].name, conditionals[0].fn, params);
|
|
} else {
|
|
return new RelationalNode(conditionals.map(function (c) {
|
|
return c.fn;
|
|
}), params);
|
|
}
|
|
}
|
|
/**
|
|
* Bitwise left shift, bitwise right arithmetic shift, bitwise right logical shift
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseShift(state) {
|
|
var node, name, fn, params;
|
|
node = parseConversion(state);
|
|
var operators = {
|
|
'<<': 'leftShift',
|
|
'>>': 'rightArithShift',
|
|
'>>>': 'rightLogShift'
|
|
};
|
|
|
|
while ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
name = state.token;
|
|
fn = operators[name];
|
|
getTokenSkipNewline(state);
|
|
params = [node, parseConversion(state)];
|
|
node = new OperatorNode(name, fn, params);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* conversion operators 'to' and 'in'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseConversion(state) {
|
|
var node, name, fn, params;
|
|
node = parseRange(state);
|
|
var operators = {
|
|
to: 'to',
|
|
in: 'to' // alias of 'to'
|
|
|
|
};
|
|
|
|
while ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
name = state.token;
|
|
fn = operators[name];
|
|
getTokenSkipNewline(state);
|
|
|
|
if (name === 'in' && state.token === '') {
|
|
// end of expression -> this is the unit 'in' ('inch')
|
|
node = new OperatorNode('*', 'multiply', [node, new SymbolNode('in')], true);
|
|
} else {
|
|
// operator 'a to b' or 'a in b'
|
|
params = [node, parseRange(state)];
|
|
node = new OperatorNode(name, fn, params);
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* parse range, "start:end", "start:step:end", ":", "start:", ":end", etc
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseRange(state) {
|
|
var node;
|
|
var params = [];
|
|
|
|
if (state.token === ':') {
|
|
// implicit start=1 (one-based)
|
|
node = new ConstantNode(1);
|
|
} else {
|
|
// explicit start
|
|
node = parseAddSubtract(state);
|
|
}
|
|
|
|
if (state.token === ':' && state.conditionalLevel !== state.nestingLevel) {
|
|
// we ignore the range operator when a conditional operator is being processed on the same level
|
|
params.push(node); // parse step and end
|
|
|
|
while (state.token === ':' && params.length < 3) {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getTokenSkipNewline(state);
|
|
|
|
if (state.token === ')' || state.token === ']' || state.token === ',' || state.token === '') {
|
|
// implicit end
|
|
params.push(new SymbolNode('end'));
|
|
} else {
|
|
// explicit end
|
|
params.push(parseAddSubtract(state));
|
|
}
|
|
}
|
|
|
|
if (params.length === 3) {
|
|
// params = [start, step, end]
|
|
node = new RangeNode(params[0], params[2], params[1]); // start, end, step
|
|
} else {
|
|
// length === 2
|
|
// params = [start, end]
|
|
node = new RangeNode(params[0], params[1]); // start, end
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* add or subtract
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseAddSubtract(state) {
|
|
var node, name, fn, params;
|
|
node = parseMultiplyDivide(state);
|
|
var operators = {
|
|
'+': 'add',
|
|
'-': 'subtract'
|
|
};
|
|
|
|
while ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
name = state.token;
|
|
fn = operators[name];
|
|
getTokenSkipNewline(state);
|
|
var rightNode = parseMultiplyDivide(state);
|
|
|
|
if (rightNode.isPercentage) {
|
|
params = [node, new OperatorNode('*', 'multiply', [node, rightNode])];
|
|
} else {
|
|
params = [node, rightNode];
|
|
}
|
|
|
|
node = new OperatorNode(name, fn, params);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* multiply, divide, modulus
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseMultiplyDivide(state) {
|
|
var node, last, name, fn;
|
|
node = parseImplicitMultiplication(state);
|
|
last = node;
|
|
var operators = {
|
|
'*': 'multiply',
|
|
'.*': 'dotMultiply',
|
|
'/': 'divide',
|
|
'./': 'dotDivide'
|
|
};
|
|
|
|
while (true) {
|
|
if ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
// explicit operators
|
|
name = state.token;
|
|
fn = operators[name];
|
|
getTokenSkipNewline(state);
|
|
last = parseImplicitMultiplication(state);
|
|
node = new OperatorNode(name, fn, [node, last]);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* implicit multiplication
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseImplicitMultiplication(state) {
|
|
var node, last;
|
|
node = parseRule2(state);
|
|
last = node;
|
|
|
|
while (true) {
|
|
if (state.tokenType === TOKENTYPE.SYMBOL || state.token === 'in' && (0, _is.isConstantNode)(node) || state.tokenType === TOKENTYPE.NUMBER && !(0, _is.isConstantNode)(last) && (!(0, _is.isOperatorNode)(last) || last.op === '!') || state.token === '(') {
|
|
// parse implicit multiplication
|
|
//
|
|
// symbol: implicit multiplication like '2a', '(2+3)a', 'a b'
|
|
// number: implicit multiplication like '(2+3)2'
|
|
// parenthesis: implicit multiplication like '2(3+4)', '(3+4)(1+2)'
|
|
last = parseRule2(state);
|
|
node = new OperatorNode('*', 'multiply', [node, last], true
|
|
/* implicit */
|
|
);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* Infamous "rule 2" as described in https://github.com/josdejong/mathjs/issues/792#issuecomment-361065370
|
|
* Explicit division gets higher precedence than implicit multiplication
|
|
* when the division matches this pattern: [number] / [number] [symbol]
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseRule2(state) {
|
|
var node = parsePercentage(state);
|
|
var last = node;
|
|
var tokenStates = [];
|
|
|
|
while (true) {
|
|
// Match the "number /" part of the pattern "number / number symbol"
|
|
if (state.token === '/' && (0, _is.isConstantNode)(last)) {
|
|
// Look ahead to see if the next token is a number
|
|
tokenStates.push((0, _extends2.default)({}, state));
|
|
getTokenSkipNewline(state); // Match the "number / number" part of the pattern
|
|
|
|
if (state.tokenType === TOKENTYPE.NUMBER) {
|
|
// Look ahead again
|
|
tokenStates.push((0, _extends2.default)({}, state));
|
|
getTokenSkipNewline(state); // Match the "symbol" part of the pattern, or a left parenthesis
|
|
|
|
if (state.tokenType === TOKENTYPE.SYMBOL || state.token === '(') {
|
|
// We've matched the pattern "number / number symbol".
|
|
// Rewind once and build the "number / number" node; the symbol will be consumed later
|
|
(0, _extends2.default)(state, tokenStates.pop());
|
|
tokenStates.pop();
|
|
last = parsePercentage(state);
|
|
node = new OperatorNode('/', 'divide', [node, last]);
|
|
} else {
|
|
// Not a match, so rewind
|
|
tokenStates.pop();
|
|
(0, _extends2.default)(state, tokenStates.pop());
|
|
break;
|
|
}
|
|
} else {
|
|
// Not a match, so rewind
|
|
(0, _extends2.default)(state, tokenStates.pop());
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* percentage or mod
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parsePercentage(state) {
|
|
var node, name, fn, params;
|
|
node = parseUnary(state);
|
|
var operators = {
|
|
'%': 'mod',
|
|
mod: 'mod'
|
|
};
|
|
|
|
while ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
name = state.token;
|
|
fn = operators[name];
|
|
getTokenSkipNewline(state);
|
|
|
|
if (name === '%' && state.tokenType === TOKENTYPE.DELIMITER && state.token !== '(') {
|
|
// If the expression contains only %, then treat that as /100
|
|
node = new OperatorNode('/', 'divide', [node, new ConstantNode(100)], false, true);
|
|
} else {
|
|
params = [node, parseUnary(state)];
|
|
node = new OperatorNode(name, fn, params);
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* Unary plus and minus, and logical and bitwise not
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseUnary(state) {
|
|
var name, params, fn;
|
|
var operators = {
|
|
'-': 'unaryMinus',
|
|
'+': 'unaryPlus',
|
|
'~': 'bitNot',
|
|
not: 'not'
|
|
};
|
|
|
|
if ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
fn = operators[state.token];
|
|
name = state.token;
|
|
getTokenSkipNewline(state);
|
|
params = [parseUnary(state)];
|
|
return new OperatorNode(name, fn, params);
|
|
}
|
|
|
|
return parsePow(state);
|
|
}
|
|
/**
|
|
* power
|
|
* Note: power operator is right associative
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parsePow(state) {
|
|
var node, name, fn, params;
|
|
node = parseLeftHandOperators(state);
|
|
|
|
if (state.token === '^' || state.token === '.^') {
|
|
name = state.token;
|
|
fn = name === '^' ? 'pow' : 'dotPow';
|
|
getTokenSkipNewline(state);
|
|
params = [node, parseUnary(state)]; // Go back to unary, we can have '2^-3'
|
|
|
|
node = new OperatorNode(name, fn, params);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* Left hand operators: factorial x!, ctranspose x'
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseLeftHandOperators(state) {
|
|
var node, name, fn, params;
|
|
node = parseCustomNodes(state);
|
|
var operators = {
|
|
'!': 'factorial',
|
|
'\'': 'ctranspose'
|
|
};
|
|
|
|
while ((0, _object.hasOwnProperty)(operators, state.token)) {
|
|
name = state.token;
|
|
fn = operators[name];
|
|
getToken(state);
|
|
params = [node];
|
|
node = new OperatorNode(name, fn, params);
|
|
node = parseAccessors(state, node);
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* Parse a custom node handler. A node handler can be used to process
|
|
* nodes in a custom way, for example for handling a plot.
|
|
*
|
|
* A handler must be passed as second argument of the parse function.
|
|
* - must extend math.Node
|
|
* - must contain a function _compile(defs: Object) : string
|
|
* - must contain a function find(filter: Object) : Node[]
|
|
* - must contain a function toString() : string
|
|
* - the constructor is called with a single argument containing all parameters
|
|
*
|
|
* For example:
|
|
*
|
|
* nodes = {
|
|
* 'plot': PlotHandler
|
|
* }
|
|
*
|
|
* The constructor of the handler is called as:
|
|
*
|
|
* node = new PlotHandler(params)
|
|
*
|
|
* The handler will be invoked when evaluating an expression like:
|
|
*
|
|
* node = math.parse('plot(sin(x), x)', nodes)
|
|
*
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseCustomNodes(state) {
|
|
var params = [];
|
|
|
|
if (state.tokenType === TOKENTYPE.SYMBOL && (0, _object.hasOwnProperty)(state.extraNodes, state.token)) {
|
|
var CustomNode = state.extraNodes[state.token];
|
|
getToken(state); // parse parameters
|
|
|
|
if (state.token === '(') {
|
|
params = [];
|
|
openParams(state);
|
|
getToken(state);
|
|
|
|
if (state.token !== ')') {
|
|
params.push(parseAssignment(state)); // parse a list with parameters
|
|
|
|
while (state.token === ',') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getToken(state);
|
|
params.push(parseAssignment(state));
|
|
}
|
|
}
|
|
|
|
if (state.token !== ')') {
|
|
throw createSyntaxError(state, 'Parenthesis ) expected');
|
|
}
|
|
|
|
closeParams(state);
|
|
getToken(state);
|
|
} // create a new custom node
|
|
// noinspection JSValidateTypes
|
|
|
|
|
|
return new CustomNode(params);
|
|
}
|
|
|
|
return parseSymbol(state);
|
|
}
|
|
/**
|
|
* parse symbols: functions, variables, constants, units
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseSymbol(state) {
|
|
var node, name;
|
|
|
|
if (state.tokenType === TOKENTYPE.SYMBOL || state.tokenType === TOKENTYPE.DELIMITER && state.token in NAMED_DELIMITERS) {
|
|
name = state.token;
|
|
getToken(state);
|
|
|
|
if ((0, _object.hasOwnProperty)(CONSTANTS, name)) {
|
|
// true, false, null, ...
|
|
node = new ConstantNode(CONSTANTS[name]);
|
|
} else if (NUMERIC_CONSTANTS.indexOf(name) !== -1) {
|
|
// NaN, Infinity
|
|
node = new ConstantNode(numeric(name, 'number'));
|
|
} else {
|
|
node = new SymbolNode(name);
|
|
} // parse function parameters and matrix index
|
|
|
|
|
|
node = parseAccessors(state, node);
|
|
return node;
|
|
}
|
|
|
|
return parseDoubleQuotesString(state);
|
|
}
|
|
/**
|
|
* parse accessors:
|
|
* - function invocation in round brackets (...), for example sqrt(2)
|
|
* - index enclosed in square brackets [...], for example A[2,3]
|
|
* - dot notation for properties, like foo.bar
|
|
* @param {Object} state
|
|
* @param {Node} node Node on which to apply the parameters. If there
|
|
* are no parameters in the expression, the node
|
|
* itself is returned
|
|
* @param {string[]} [types] Filter the types of notations
|
|
* can be ['(', '[', '.']
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseAccessors(state, node, types) {
|
|
var params;
|
|
|
|
while ((state.token === '(' || state.token === '[' || state.token === '.') && (!types || types.indexOf(state.token) !== -1)) {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
params = [];
|
|
|
|
if (state.token === '(') {
|
|
if ((0, _is.isSymbolNode)(node) || (0, _is.isAccessorNode)(node)) {
|
|
// function invocation like fn(2, 3) or obj.fn(2, 3)
|
|
openParams(state);
|
|
getToken(state);
|
|
|
|
if (state.token !== ')') {
|
|
params.push(parseAssignment(state)); // parse a list with parameters
|
|
|
|
while (state.token === ',') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getToken(state);
|
|
params.push(parseAssignment(state));
|
|
}
|
|
}
|
|
|
|
if (state.token !== ')') {
|
|
throw createSyntaxError(state, 'Parenthesis ) expected');
|
|
}
|
|
|
|
closeParams(state);
|
|
getToken(state);
|
|
node = new FunctionNode(node, params);
|
|
} else {
|
|
// implicit multiplication like (2+3)(4+5) or sqrt(2)(1+2)
|
|
// don't parse it here but let it be handled by parseImplicitMultiplication
|
|
// with correct precedence
|
|
return node;
|
|
}
|
|
} else if (state.token === '[') {
|
|
// index notation like variable[2, 3]
|
|
openParams(state);
|
|
getToken(state);
|
|
|
|
if (state.token !== ']') {
|
|
params.push(parseAssignment(state)); // parse a list with parameters
|
|
|
|
while (state.token === ',') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getToken(state);
|
|
params.push(parseAssignment(state));
|
|
}
|
|
}
|
|
|
|
if (state.token !== ']') {
|
|
throw createSyntaxError(state, 'Parenthesis ] expected');
|
|
}
|
|
|
|
closeParams(state);
|
|
getToken(state);
|
|
node = new AccessorNode(node, new IndexNode(params));
|
|
} else {
|
|
// dot notation like variable.prop
|
|
getToken(state);
|
|
|
|
if (state.tokenType !== TOKENTYPE.SYMBOL) {
|
|
throw createSyntaxError(state, 'Property name expected after dot');
|
|
}
|
|
|
|
params.push(new ConstantNode(state.token));
|
|
getToken(state);
|
|
var dotNotation = true;
|
|
node = new AccessorNode(node, new IndexNode(params, dotNotation));
|
|
}
|
|
}
|
|
|
|
return node;
|
|
}
|
|
/**
|
|
* Parse a double quotes string.
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseDoubleQuotesString(state) {
|
|
var node, str;
|
|
|
|
if (state.token === '"') {
|
|
str = parseDoubleQuotesStringToken(state); // create constant
|
|
|
|
node = new ConstantNode(str); // parse index parameters
|
|
|
|
node = parseAccessors(state, node);
|
|
return node;
|
|
}
|
|
|
|
return parseSingleQuotesString(state);
|
|
}
|
|
/**
|
|
* Parse a string surrounded by double quotes "..."
|
|
* @return {string}
|
|
*/
|
|
|
|
|
|
function parseDoubleQuotesStringToken(state) {
|
|
var str = '';
|
|
|
|
while (currentCharacter(state) !== '' && currentCharacter(state) !== '"') {
|
|
if (currentCharacter(state) === '\\') {
|
|
// escape character, immediately process the next
|
|
// character to prevent stopping at a next '\"'
|
|
str += currentCharacter(state);
|
|
next(state);
|
|
}
|
|
|
|
str += currentCharacter(state);
|
|
next(state);
|
|
}
|
|
|
|
getToken(state);
|
|
|
|
if (state.token !== '"') {
|
|
throw createSyntaxError(state, 'End of string " expected');
|
|
}
|
|
|
|
getToken(state);
|
|
return JSON.parse('"' + str + '"'); // unescape escaped characters
|
|
}
|
|
/**
|
|
* Parse a single quotes string.
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseSingleQuotesString(state) {
|
|
var node, str;
|
|
|
|
if (state.token === '\'') {
|
|
str = parseSingleQuotesStringToken(state); // create constant
|
|
|
|
node = new ConstantNode(str); // parse index parameters
|
|
|
|
node = parseAccessors(state, node);
|
|
return node;
|
|
}
|
|
|
|
return parseMatrix(state);
|
|
}
|
|
/**
|
|
* Parse a string surrounded by single quotes '...'
|
|
* @return {string}
|
|
*/
|
|
|
|
|
|
function parseSingleQuotesStringToken(state) {
|
|
var str = '';
|
|
|
|
while (currentCharacter(state) !== '' && currentCharacter(state) !== '\'') {
|
|
if (currentCharacter(state) === '\\') {
|
|
// escape character, immediately process the next
|
|
// character to prevent stopping at a next '\''
|
|
str += currentCharacter(state);
|
|
next(state);
|
|
}
|
|
|
|
str += currentCharacter(state);
|
|
next(state);
|
|
}
|
|
|
|
getToken(state);
|
|
|
|
if (state.token !== '\'') {
|
|
throw createSyntaxError(state, 'End of string \' expected');
|
|
}
|
|
|
|
getToken(state);
|
|
return JSON.parse('"' + str + '"'); // unescape escaped characters
|
|
}
|
|
/**
|
|
* parse the matrix
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseMatrix(state) {
|
|
var array, params, rows, cols;
|
|
|
|
if (state.token === '[') {
|
|
// matrix [...]
|
|
openParams(state);
|
|
getToken(state);
|
|
|
|
if (state.token !== ']') {
|
|
// this is a non-empty matrix
|
|
var row = parseRow(state);
|
|
|
|
if (state.token === ';') {
|
|
// 2 dimensional array
|
|
rows = 1;
|
|
params = [row]; // the rows of the matrix are separated by dot-comma's
|
|
|
|
while (state.token === ';') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getToken(state);
|
|
params[rows] = parseRow(state);
|
|
rows++;
|
|
}
|
|
|
|
if (state.token !== ']') {
|
|
throw createSyntaxError(state, 'End of matrix ] expected');
|
|
}
|
|
|
|
closeParams(state);
|
|
getToken(state); // check if the number of columns matches in all rows
|
|
|
|
cols = params[0].items.length;
|
|
|
|
for (var r = 1; r < rows; r++) {
|
|
if (params[r].items.length !== cols) {
|
|
throw createError(state, 'Column dimensions mismatch ' + '(' + params[r].items.length + ' !== ' + cols + ')');
|
|
}
|
|
}
|
|
|
|
array = new ArrayNode(params);
|
|
} else {
|
|
// 1 dimensional vector
|
|
if (state.token !== ']') {
|
|
throw createSyntaxError(state, 'End of matrix ] expected');
|
|
}
|
|
|
|
closeParams(state);
|
|
getToken(state);
|
|
array = row;
|
|
}
|
|
} else {
|
|
// this is an empty matrix "[ ]"
|
|
closeParams(state);
|
|
getToken(state);
|
|
array = new ArrayNode([]);
|
|
}
|
|
|
|
return parseAccessors(state, array);
|
|
}
|
|
|
|
return parseObject(state);
|
|
}
|
|
/**
|
|
* Parse a single comma-separated row from a matrix, like 'a, b, c'
|
|
* @return {ArrayNode} node
|
|
*/
|
|
|
|
|
|
function parseRow(state) {
|
|
var params = [parseAssignment(state)];
|
|
var len = 1;
|
|
|
|
while (state.token === ',') {
|
|
// eslint-disable-line no-unmodified-loop-condition
|
|
getToken(state); // parse expression
|
|
|
|
params[len] = parseAssignment(state);
|
|
len++;
|
|
}
|
|
|
|
return new ArrayNode(params);
|
|
}
|
|
/**
|
|
* parse an object, enclosed in angle brackets{...}, for example {value: 2}
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseObject(state) {
|
|
if (state.token === '{') {
|
|
openParams(state);
|
|
var key;
|
|
var properties = {};
|
|
|
|
do {
|
|
getToken(state);
|
|
|
|
if (state.token !== '}') {
|
|
// parse key
|
|
if (state.token === '"') {
|
|
key = parseDoubleQuotesStringToken(state);
|
|
} else if (state.token === '\'') {
|
|
key = parseSingleQuotesStringToken(state);
|
|
} else if (state.tokenType === TOKENTYPE.SYMBOL || state.tokenType === TOKENTYPE.DELIMITER && state.token in NAMED_DELIMITERS) {
|
|
key = state.token;
|
|
getToken(state);
|
|
} else {
|
|
throw createSyntaxError(state, 'Symbol or string expected as object key');
|
|
} // parse key/value separator
|
|
|
|
|
|
if (state.token !== ':') {
|
|
throw createSyntaxError(state, 'Colon : expected after object key');
|
|
}
|
|
|
|
getToken(state); // parse key
|
|
|
|
properties[key] = parseAssignment(state);
|
|
}
|
|
} while (state.token === ','); // eslint-disable-line no-unmodified-loop-condition
|
|
|
|
|
|
if (state.token !== '}') {
|
|
throw createSyntaxError(state, 'Comma , or bracket } expected after object value');
|
|
}
|
|
|
|
closeParams(state);
|
|
getToken(state);
|
|
var node = new ObjectNode(properties); // parse index parameters
|
|
|
|
node = parseAccessors(state, node);
|
|
return node;
|
|
}
|
|
|
|
return parseNumber(state);
|
|
}
|
|
/**
|
|
* parse a number
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseNumber(state) {
|
|
var numberStr;
|
|
|
|
if (state.tokenType === TOKENTYPE.NUMBER) {
|
|
// this is a number
|
|
numberStr = state.token;
|
|
getToken(state);
|
|
return new ConstantNode(numeric(numberStr, config.number));
|
|
}
|
|
|
|
return parseParentheses(state);
|
|
}
|
|
/**
|
|
* parentheses
|
|
* @return {Node} node
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseParentheses(state) {
|
|
var node; // check if it is a parenthesized expression
|
|
|
|
if (state.token === '(') {
|
|
// parentheses (...)
|
|
openParams(state);
|
|
getToken(state);
|
|
node = parseAssignment(state); // start again
|
|
|
|
if (state.token !== ')') {
|
|
throw createSyntaxError(state, 'Parenthesis ) expected');
|
|
}
|
|
|
|
closeParams(state);
|
|
getToken(state);
|
|
node = new ParenthesisNode(node);
|
|
node = parseAccessors(state, node);
|
|
return node;
|
|
}
|
|
|
|
return parseEnd(state);
|
|
}
|
|
/**
|
|
* Evaluated when the expression is not yet ended but expected to end
|
|
* @return {Node} res
|
|
* @private
|
|
*/
|
|
|
|
|
|
function parseEnd(state) {
|
|
if (state.token === '') {
|
|
// syntax error or unexpected end of expression
|
|
throw createSyntaxError(state, 'Unexpected end of expression');
|
|
} else {
|
|
throw createSyntaxError(state, 'Value expected');
|
|
}
|
|
}
|
|
/**
|
|
* Shortcut for getting the current row value (one based)
|
|
* Returns the line of the currently handled expression
|
|
* @private
|
|
*/
|
|
|
|
/* TODO: implement keeping track on the row number
|
|
function row () {
|
|
return null
|
|
}
|
|
*/
|
|
|
|
/**
|
|
* Shortcut for getting the current col value (one based)
|
|
* Returns the column (position) where the last state.token starts
|
|
* @private
|
|
*/
|
|
|
|
|
|
function col(state) {
|
|
return state.index - state.token.length + 1;
|
|
}
|
|
/**
|
|
* Create an error
|
|
* @param {Object} state
|
|
* @param {string} message
|
|
* @return {SyntaxError} instantiated error
|
|
* @private
|
|
*/
|
|
|
|
|
|
function createSyntaxError(state, message) {
|
|
var c = col(state);
|
|
var error = new SyntaxError(message + ' (char ' + c + ')');
|
|
error.char = c;
|
|
return error;
|
|
}
|
|
/**
|
|
* Create an error
|
|
* @param {Object} state
|
|
* @param {string} message
|
|
* @return {Error} instantiated error
|
|
* @private
|
|
*/
|
|
|
|
|
|
function createError(state, message) {
|
|
var c = col(state);
|
|
var error = new SyntaxError(message + ' (char ' + c + ')');
|
|
error.char = c;
|
|
return error;
|
|
}
|
|
|
|
return parse;
|
|
});
|
|
exports.createParse = createParse; |