ebnf-parser.js

var bnf = require("./parser").parser,
    ebnf = require("./ebnf-transform"),
    jisonlex = require("lex-parser");

exports.parse = function parse (grammar) { return bnf.parse(grammar); };
exports.transform = ebnf.transform;

// adds a declaration to the grammar
bnf.yy.addDeclaration = function (grammar, decl) {
    if (decl.start) {
        grammar.start = decl.start;
    } else if (decl.lex) {
        grammar.lex = parseLex(decl.lex);
    } else if (decl.operator) {
        if (!grammar.operators) grammar.operators = [];
        grammar.operators.push(decl.operator);
    } else if (decl.token) {
        if (!grammar.extra_tokens) grammar.extra_tokens = [];
        grammar.extra_tokens.push(decl.token);
    } else if (decl.token_list) {
        if (!grammar.extra_tokens) grammar.extra_tokens = [];
        decl.token_list.forEach(function (tok) {
            grammar.extra_tokens.push(tok);
        });
    } else if (decl.parseParam) {
        if (!grammar.parseParams) grammar.parseParams = [];
        grammar.parseParams = grammar.parseParams.concat(decl.parseParam);
    } else if (decl.parserType) {
        if (!grammar.options) grammar.options = {};
        grammar.options.type = decl.parserType;
    } else if (decl.include) {
        if (!grammar.moduleInclude) grammar.moduleInclude = '';
        grammar.moduleInclude += decl.include;
    } else if (decl.options) {
        if (!grammar.options) grammar.options = {};
        // last occurrence of %option wins:
        for (var i = 0; i < decl.options.length; i++) {
            grammar.options[decl.options[i][0]] = decl.options[i][1];
        }
    } else if (decl.unknownDecl) {
        if (!grammar.unknownDecls) grammar.unknownDecls = [];
        grammar.unknownDecls.push(decl.unknownDecl);
    } else if (decl.imports) {
        if (!grammar.imports) grammar.imports = [];
        grammar.imports.push(decl.imports);
    } else if (decl.actionInclude) {
        if (!grammar.actionInclude) {
            grammar.actionInclude = '';
        }
        grammar.actionInclude += decl.actionInclude;
    }
};

// parse an embedded lex section
var parseLex = function (text) {
    text = text.replace(/(?:^%lex)|(?:\/lex$)/g, '');
    return jisonlex.parse(text);
};