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+# fastparse
+
+A very simple and stupid parser, based on a statemachine and regular expressions.
+
+It's not intended for complex languages. It's intended to easily write a simple parser for a simple language.
+
+
+
+## Usage
+
+Pass a description of statemachine to the constructor. The description must be in this form:
+
+``` javascript
+new Parser(description)
+
+description is {
+	// The key is the name of the state
+	// The value is an object containing possible transitions
+	"state-name": {
+		// The key is a regular expression
+		// If the regular expression matches the transition is executed
+		// The value can be "true", a other state name or a function
+
+		"a": true,
+		// true will make the parser stay in the current state
+		
+		"b": "other-state-name",
+		// a string will make the parser transit to a new state
+		
+		"[cde]": function(match, index, matchLength) {
+			// "match" will be the matched string
+			// "index" will be the position in the complete string
+			// "matchLength" will be "match.length"
+			
+			// "this" will be the "context" passed to the "parse" method"
+			
+			// A new state name (string) can be returned
+			return "other-state-name";
+		},
+		
+		"([0-9]+)(\\.[0-9]+)?": function(match, first, second, index, matchLength) {
+			// groups can be used in the regular expression
+			// they will match to arguments "first", "second"
+		},
+		
+		// the parser stops when it cannot match the string anymore
+		
+		// order of keys is the order in which regular expressions are matched
+		// if the javascript runtime preserves the order of keys in an object
+		// (this is not standardized, but it's a de-facto standard)
+	}
+}
+```
+
+The statemachine is compiled down to a single regular expression per state. So basically the parsing work is delegated to the (native) regular expression logic of the javascript runtime.
+
+
+``` javascript
+Parser.prototype.parse(initialState: String, parsedString: String, context: Object)
+```
+
+`initialState`: state where the parser starts to parse.
+
+`parsedString`: the string which should be parsed.
+
+`context`: an object which can be used to save state and results. Available as `this` in transition functions.
+
+returns `context`
+
+
+
+
+## Example
+
+``` javascript
+var Parser = require("fastparse");
+
+// A simple parser that extracts @licence ... from comments in a JS file
+var parser = new Parser({
+	// The "source" state
+	"source": {
+		// matches comment start
+		"/\\*": "comment",
+		"//": "linecomment",
+		
+		// this would be necessary for a complex language like JS
+		// but omitted here for simplicity
+		// "\"": "string1",
+		// "\'": "string2",
+		// "\/": "regexp"
+		
+	},
+	// The "comment" state
+	"comment": {
+		"\\*/": "source",
+		"@licen[cs]e\\s((?:[^*\n]|\\*+[^*/\n])*)": function(match, licenseText) {
+			this.licences.push(licenseText.trim());
+		}
+	},
+	// The "linecomment" state
+	"linecomment": {
+		"\n": "source",
+		"@licen[cs]e\\s(.*)": function(match, licenseText) {
+			this.licences.push(licenseText.trim());
+		}
+	}
+});
+
+var licences = parser.parse("source", sourceCode, { licences: [] }).licences;
+
+console.log(licences);
+```
+
+
+
+## License
+
+MIT (http://www.opensource.org/licenses/mit-license.php)