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Parser.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

function ignoreFunction() {}

function createReturningFunction(value) {
	return function() {
		return value;
	};
}

function Parser(states) {
	this.states = this.compileStates(states);
}

Parser.prototype.compileStates = function(states) {
	var result = {};
	Object.keys(states).forEach(function(name) {
		result[name] = this.compileState(states[name], states);
	}, this);
	return result;
};

Parser.prototype.compileState = function(state, states) {
	var regExps = [];
	function iterator(str, value) {
		regExps.push({
			groups: Parser.getGroupCount(str),
			regExp: str,
			value: value
		});
	}
	function processState(statePart) {
		if(Array.isArray(statePart)) {
			statePart.forEach(processState);
		} else if(typeof statePart === "object") {
			Object.keys(statePart).forEach(function(key) {
				iterator(key, statePart[key]);
			});
		} else if(typeof statePart === "string") {
			processState(states[statePart]);
		} else {
			throw new Error("Unexpected 'state' format");
		}
	}
	processState(state);
	var total = regExps.map(function(r) {
		return "(" + r.regExp + ")";
	}).join("|");
	var actions = [];
	var pos = 1;
	regExps.forEach(function(r) {
		var fn;
		if(typeof r.value === "function") {
			fn = r.value;
		} else if(typeof r.value === "string") {
			fn = createReturningFunction(r.value);
		} else {
			fn = ignoreFunction;
		}
		actions.push({
			name: r.regExp,
			fn: fn,
			pos: pos,
			pos2: pos + r.groups + 1
		});
		pos += r.groups + 1;
	});
	return {
		regExp: new RegExp(total, "g"),
		actions: actions
	};
};

Parser.getGroupCount = function(regExpStr) {
	return new RegExp("(" + regExpStr + ")|^$").exec("").length - 2;
};

Parser.prototype.parse = function(initialState, string, context) {
	context = context || {};
	var currentState = initialState;
	var currentIndex = 0;
	for(;;) {
		var state = this.states[currentState];
		var regExp = state.regExp;
		regExp.lastIndex = currentIndex;
		var match = regExp.exec(string);
		if(!match) return context;
		var actions = state.actions;
		currentIndex = state.regExp.lastIndex;
		for(var i = 0; i < actions.length; i++) {
			var action = actions[i];
			if(match[action.pos]) {
				var ret = action.fn.apply(context, Array.prototype.slice.call(match, action.pos, action.pos2).concat([state.regExp.lastIndex - match[0].length, match[0].length]));
				if(ret) {
					if(!(ret in this.states))
						throw new Error("State '" + ret + "' doesn't exist");
					currentState = ret;
				}
				break;
			}
		}
	}
};

module.exports = Parser;

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	freeclou/freeclou	drwxrwxr-x	2025-01-27 08:09:41
..	dir	-	freeclou/freeclou	drwxrwxr-x	2025-01-27 08:09:41
Parser.js	text/plain	2.55 KB	freeclou/freeclou	-rw-rw-r--	2018-10-30 02:34:08