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https://github.com/Jermolene/TiddlyWiki5
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115 lines
3.3 KiB
JavaScript
Executable File
115 lines
3.3 KiB
JavaScript
Executable File
/*\
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title: js/ArgParser.js
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Parse a space-separated string of name:value parameters. Values can be quoted with single quotes, double quotes, double square brackets, or double curly braces.
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The parameters are returned in a structure that can be referenced like this:
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(return).byName["name"][0] - First occurance of parameter with a given name
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(return).byPos[0].n - Name of parameter in first position
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(return).byPos[0].v.string - Value of parameter in first position
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(return).byPos[0].v.evaluated - True if the parameter is to be evaluated
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Options and their defaults are:
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defaultName: null,
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defaultValue: null,
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noNames: false,
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cascadeDefaults: false,
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allowEval: true
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\*/
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(function(){
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/*jslint node: true */
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"use strict";
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var ArgParser = function(argString,options) {
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options = options || {};
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var defaultName = options.defaultName,
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defaultValue = options.defaultValue;
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var parseToken = function(match,p) {
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var n;
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if(match[p]) { // Double quoted
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n = {string: match[p]};
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} else if(match[p+1]) { // Single quoted
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n = {string: match[p+1]};
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} else if(match[p+2]) { // Double-square-bracket quoted
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n = {string: match[p+2]};
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} else if(match[p+3]) { // Double-brace quoted
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n = {string: match[p+3], evaluated: true};
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} else if(match[p+4]) { // Unquoted
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n = {string: match[p+4]};
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} else if(match[p+5]) { // empty quote
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n = {string: ""};
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}
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return n;
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};
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this.byPos = [];
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var dblQuote = "(?:\"((?:(?:\\\\\")|[^\"])+)\")",
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sngQuote = "(?:'((?:(?:\\\\\')|[^'])+)')",
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dblSquare = "(?:\\[\\[((?:\\s|\\S)*?)\\]\\])",
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dblBrace = "(?:\\{\\{((?:\\s|\\S)*?)\\}\\})",
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unQuoted = options.noNames ? "([^\"'\\s]\\S*)" : "([^\"':\\s][^\\s:]*)",
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emptyQuote = "((?:\"\")|(?:''))",
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skipSpace = "(?:\\s*)",
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token = "(?:" + dblQuote + "|" + sngQuote + "|" + dblSquare + "|" + dblBrace + "|" + unQuoted + "|" + emptyQuote + ")",
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re = options.noNames ? new RegExp(token,"mg") : new RegExp(skipSpace + token + skipSpace + "(?:(\\:)" + skipSpace + token + ")?","mg"),
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match,n,v;
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do {
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match = re.exec(argString);
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if(match) {
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n = parseToken(match,1);
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if(options.noNames) {
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this.byPos.push({n:"", v:n});
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} else {
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v = parseToken(match,8);
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if(v === undefined && defaultName) {
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v = n;
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n = defaultName;
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} else if(v === undefined && defaultValue) {
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v = defaultValue;
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}
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if(n.evaluated === true) {
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n = "{{" + n.string + "}}";
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} else if (typeof n === "object" && n.hasOwnProperty("string")) {
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n = n.string;
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}
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this.byPos.push({n:n, v:v});
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if(options.cascadeDefaults) {
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defaultName = n;
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defaultValue = v;
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}
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}
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}
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} while(match);
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this.byName = {};
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for(var t=0; t<this.byPos.length; t++) {
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n = this.byPos[t].n;
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v = this.byPos[t].v;
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if(this.byName.hasOwnProperty(n))
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this.byName[n].push(v);
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else
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this.byName[n] = [v];
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}
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};
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// Retrieve the first occurance of a named parameter, or the default if missing
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ArgParser.prototype.getValueByName = function(n) {
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var v = this.byName[n];
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return v && v.length > 0 ? v[0] : null;
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};
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// Retrieve all the string values as an array
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ArgParser.prototype.getStringValues = function() {
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var result = [];
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for(var t=0; t<this.byPos.length; t++) {
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result.push(this.byPos[t].v.string);
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}
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return result;
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};
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exports.ArgParser = ArgParser;
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})();
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