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"use strict"; module.exports = codegen;
/** * Begins generating a function. * @memberof util * @param {string[]} functionParams Function parameter names * @param {string} [functionName] Function name if not anonymous * @returns {Codegen} Appender that appends code to the function's body */ function codegen(functionParams, functionName) {
/* istanbul ignore if */ if (typeof functionParams === "string") { functionName = functionParams; functionParams = undefined; }
var body = [];
/** * Appends code to the function's body or finishes generation. * @typedef Codegen * @type {function} * @param {string|Object.<string,*>} [formatStringOrScope] Format string or, to finish the function, an object of additional scope variables, if any * @param {...*} [formatParams] Format parameters * @returns {Codegen|Function} Itself or the generated function if finished * @throws {Error} If format parameter counts do not match */
function Codegen(formatStringOrScope) { // note that explicit array handling below makes this ~50% faster
// finish the function
if (typeof formatStringOrScope !== "string") { var source = toString(); if (codegen.verbose) console.log("codegen: " + source); // eslint-disable-line no-console
source = "return " + source; if (formatStringOrScope) { var scopeKeys = Object.keys(formatStringOrScope), scopeParams = new Array(scopeKeys.length + 1), scopeValues = new Array(scopeKeys.length), scopeOffset = 0; while (scopeOffset < scopeKeys.length) { scopeParams[scopeOffset] = scopeKeys[scopeOffset]; scopeValues[scopeOffset] = formatStringOrScope[scopeKeys[scopeOffset++]]; } scopeParams[scopeOffset] = source; return Function.apply(null, scopeParams).apply(null, scopeValues); // eslint-disable-line no-new-func
} return Function(source)(); // eslint-disable-line no-new-func
}
// otherwise append to body
var formatParams = new Array(arguments.length - 1), formatOffset = 0; while (formatOffset < formatParams.length) formatParams[formatOffset] = arguments[++formatOffset]; formatOffset = 0; formatStringOrScope = formatStringOrScope.replace(/%([%dfijs])/g, function replace($0, $1) { var value = formatParams[formatOffset++]; switch ($1) { case "d": case "f": return String(Number(value)); case "i": return String(Math.floor(value)); case "j": return JSON.stringify(value); case "s": return String(value); } return "%"; }); if (formatOffset !== formatParams.length) throw Error("parameter count mismatch"); body.push(formatStringOrScope); return Codegen; }
function toString(functionNameOverride) { return "function " + (functionNameOverride || functionName || "") + "(" + (functionParams && functionParams.join(",") || "") + "){\n " + body.join("\n ") + "\n}"; }
Codegen.toString = toString; return Codegen; }
/** * Begins generating a function. * @memberof util * @function codegen * @param {string} [functionName] Function name if not anonymous * @returns {Codegen} Appender that appends code to the function's body * @variation 2 */
/** * When set to `true`, codegen will log generated code to console. Useful for debugging. * @name util.codegen.verbose * @type {boolean} */ codegen.verbose = false;
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