var dict = require('./dict');
var fs = require('fs');
var grammar = {

    lex: {

        macros: {
            esc: "\\\\",
            int: dict.integer
        },

        rules: [
            ["\\$", "return 'DOLLAR'"],
            ["\\.\\.", "return 'DOT_DOT'"],
            ["\\.", "return 'DOT'"],
            ["\\*", "return 'STAR'"],
            [dict.identifier, "return 'IDENTIFIER'"],
            ["\\[", "return '['"],
            ["\\]", "return ']'"],
            [",", "return ','"],
            ["({int})?\\:({int})?(\\:({int})?)?", "return 'ARRAY_SLICE'"],
            ["{int}", "return 'INTEGER'"],
            [dict.qq_string, "yytext = yytext.substr(1,yyleng-2); return 'QQ_STRING';"],
            [dict.q_string, "yytext = yytext.substr(1,yyleng-2); return 'Q_STRING';"],
            ["\\(.+?\\)(?=\\])", "return 'SCRIPT_EXPRESSION'"],
            ["\\?\\(.+?\\)(?=\\])", "return 'FILTER_EXPRESSION'"]
        ]
    },

    start: "JSON_PATH",

    bnf: {

        JSON_PATH: [
                [ 'DOLLAR',                 'yy.ast.set({ expression: { type: "root", value: $1 } }); yy.ast.unshift(); return yy.ast.yield()' ],
                [ 'DOLLAR PATH_COMPONENTS', 'yy.ast.set({ expression: { type: "root", value: $1 } }); yy.ast.unshift(); return yy.ast.yield()' ],
                [ 'LEADING_CHILD_MEMBER_EXPRESSION',                 'yy.ast.unshift(); return yy.ast.yield()' ],
                [ 'LEADING_CHILD_MEMBER_EXPRESSION PATH_COMPONENTS', 'yy.ast.set({ operation: "member", scope: "child", expression: { type: "identifier", value: $1 }}); yy.ast.unshift(); return yy.ast.yield()' ] ],

        PATH_COMPONENTS: [
                [ 'PATH_COMPONENT',                 '' ],
                [ 'PATH_COMPONENTS PATH_COMPONENT', '' ] ],

        PATH_COMPONENT: [
                [ 'MEMBER_COMPONENT',    'yy.ast.set({ operation: "member" }); yy.ast.push()' ],
                [ 'SUBSCRIPT_COMPONENT', 'yy.ast.set({ operation: "subscript" }); yy.ast.push() ' ] ],

        MEMBER_COMPONENT: [
                [ 'CHILD_MEMBER_COMPONENT',      'yy.ast.set({ scope: "child" })' ],
                [ 'DESCENDANT_MEMBER_COMPONENT', 'yy.ast.set({ scope: "descendant" })' ] ],

        CHILD_MEMBER_COMPONENT: [
                [ 'DOT MEMBER_EXPRESSION', '' ] ],

        LEADING_CHILD_MEMBER_EXPRESSION: [
                [ 'MEMBER_EXPRESSION', 'yy.ast.set({ scope: "child", operation: "member" })' ] ],

        DESCENDANT_MEMBER_COMPONENT: [
                [ 'DOT_DOT MEMBER_EXPRESSION', '' ] ],

        MEMBER_EXPRESSION: [
                [ 'STAR',              'yy.ast.set({ expression: { type: "wildcard", value: $1 } })' ],
                [ 'IDENTIFIER',        'yy.ast.set({ expression: { type: "identifier", value: $1 } })' ],
                [ 'SCRIPT_EXPRESSION', 'yy.ast.set({ expression: { type: "script_expression", value: $1 } })' ],
                [ 'INTEGER',           'yy.ast.set({ expression: { type: "numeric_literal", value: parseInt($1) } })' ],
                [ 'END',               '' ] ],

        SUBSCRIPT_COMPONENT: [
                [ 'CHILD_SUBSCRIPT_COMPONENT',      'yy.ast.set({ scope: "child" })' ],
                [ 'DESCENDANT_SUBSCRIPT_COMPONENT', 'yy.ast.set({ scope: "descendant" })' ] ],

        CHILD_SUBSCRIPT_COMPONENT: [
                [ '[ SUBSCRIPT ]', '' ] ],

        DESCENDANT_SUBSCRIPT_COMPONENT: [
                [ 'DOT_DOT [ SUBSCRIPT ]', '' ] ],

        SUBSCRIPT: [
                [ 'SUBSCRIPT_EXPRESSION', '' ],
                [ 'SUBSCRIPT_EXPRESSION_LIST', '$1.length > 1? yy.ast.set({ expression: { type: "union", value: $1 } }) : $$ = $1' ] ],

        SUBSCRIPT_EXPRESSION_LIST: [
                [ 'SUBSCRIPT_EXPRESSION_LISTABLE', '$$ = [$1]'],
                [ 'SUBSCRIPT_EXPRESSION_LIST , SUBSCRIPT_EXPRESSION_LISTABLE', '$$ = $1.concat($3)' ] ],

        SUBSCRIPT_EXPRESSION_LISTABLE: [
                [ 'INTEGER',           '$$ = { expression: { type: "numeric_literal", value: parseInt($1) } }; yy.ast.set($$)' ],
                [ 'STRING_LITERAL',    '$$ = { expression: { type: "string_literal", value: $1 } }; yy.ast.set($$)' ],
                [ 'ARRAY_SLICE',       '$$ = { expression: { type: "slice", value: $1 } }; yy.ast.set($$)' ] ],

        SUBSCRIPT_EXPRESSION: [
                [ 'STAR',              '$$ = { expression: { type: "wildcard", value: $1 } }; yy.ast.set($$)' ],
                [ 'SCRIPT_EXPRESSION', '$$ = { expression: { type: "script_expression", value: $1 } }; yy.ast.set($$)' ],
                [ 'FILTER_EXPRESSION', '$$ = { expression: { type: "filter_expression", value: $1 } }; yy.ast.set($$)' ] ],

        STRING_LITERAL: [
                [ 'QQ_STRING', "$$ = $1" ],
                [ 'Q_STRING',  "$$ = $1" ] ]
    }
};
if (fs.readFileSync) {
  grammar.moduleInclude = fs.readFileSync(require.resolve("../include/module.js"));
  grammar.actionInclude = fs.readFileSync(require.resolve("../include/action.js"));
}

module.exports = grammar;