var SPEG_actions_visitor = require('./speg_visitor').SPEG_actions_visitor;

var SPEG_module_visitor = require('./speg_module_visitor').SPEG_module_visitor;

var SPEG_parser = require('./speg_parser');

var rd = require('./rd_parser');

var ex = require('./exceptions');

function SPEG() {

this.parser = new SPEG_parser();

this.visitor = new SPEG_actions_visitor();

this.speg_parser = null;

this.state = null;

}

SPEG.prototype.parse_grammar = function(grammar) {

this.speg_parser = null;

var speg_ast = this.parser.parse(grammar);

if (speg_ast) {

this.speg_parser = this.visitor.visit(speg_ast);

} else {

throw new ex.GrammarParseError('Failed to parse grammar: \n\n' + this.parser.get_last_error());

}

};

SPEG.prototype.parse_text = function(text) {

if (this.speg_parser) {

var rules = this.speg_parser.children;

var first_rule = rules[0];

var first_rule_parser = first_rule.parser;

this.state = { text: text, position: 0, rules: rules };

var ast = first_rule_parser(this.state);

if (ast) {

return ast;

} else {

throw new ex.TextParseError('Failed to parse text: \n\n' + rd.get_last_error(this.state))

}

} else {

throw Error('You need grammar to parse text. Call parseGrammar first');

}

};

SPEG.prototype.parse = function(grammar, text) {

var speg_ast = this.parser.parse(grammar);

if (speg_ast) {

var generated_parser = this.visitor.visit(speg_ast);

var rules = generated_parser.children;

var first_rule = rules[0];

var first_rule_parser = first_rule.parser;

this.state = { text: text, position: 0, rules: rules };

var ast = first_rule_parser(this.state);

if (ast) {

return ast;

} else {

throw new ex.TextParseError('Failed to parse text: \n\n' + rd.get_last_error(this.state))

}

} else {

throw new ex.GrammarParseError('Failed to parse grammar: \n\n' + this.parser.get_last_error())

}

};

SPEG.prototype.parse_module = function(grammar) {

this.module_visitor = new SPEG_module_visitor();

var speg_ast = this.parser.parse(grammar);

if (speg_ast) {

return this.module_visitor.visit(speg_ast);

} else {

throw new ex.GrammarParseError('Failed to parse grammar: \n\n' + this.parser.get_last_error());

}

}

module.exports = {

SPEG: SPEG,

rd: rd,

TextParseError: ex.TextParseError,

GrammarParseError: ex.GrammarParseError

};