nv-pg-jrow-ir-cols-front

install

• npm install nv-pg-jrow-ir-cols-front

usage

  const { creat_cols_for_back}   = require("nv-pg-jrow-ir-cols-front");

example

            const _parser = require("/mnt/sdb/JS/BUSINESS-LIB_/PG/nv-pg-jrow/pkgs/nv-pg-jrow-front")._parser;
            const unparse_func = _parser.unparse;
            const _scheme = require("/mnt/sdb/JS/BUSINESS-LIB_/PG/nv-pg-jrow/pkgs/nv-pg-jrow-scheme");


            var jcfg = {                                                               //non_leaf  '': [c0,c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11]
                ss:'text',                                //leaf c0      s                   
                aa:[                                                                      //non_leaf  a : [c1,c2,c3,c4,c5,c6]
                    'float8',                            //leaf c1      a.0  
                    'text',                              //leaf c2      a.1 
                    {                                                                    //non_leaf  a.2: [c3,c4]
                        dina_k0:'text',                  //leaf c3      a.2.dina_k0 
                        dina_k1:'text',                  //leaf c4      a.2.dina_k1
                    },
                    'int4',                              //leaf c5      a.3
                    'json'                               //leaf c6      a.4
                ],
                dd: {                                                                      //non_leaf d : [c7,c8,c9,c10,c11]
                    k0:'int8',                           //leaf c7      d.k0
                    k1:'buf',                            //leaf c8      d.k1 
                    aind: [                                                               //non_leaf d.aind : [c9,c10,c11]
                        'text',                          //leaf c9      a.aind.0  
                        'text',                          //leaf c10     a.aind.1
                        'json'                           //leaf c11     a.aind.2
                    ]
                }
            }

            console.log("scheme:");
            console.dir(jcfg);

            var scheme = _scheme.creat(jcfg).scheme;

            var cd = `extra`;
            var [cond,rslt] = creat_cols_for_back(cd,scheme,_parser);
            console.dir([cond,rslt],{depth:null});

            /*
                [ true, { cd: [ 'extra' ], hint: Hint { jpl: {}, jlit: {} } } ] 
            */

            var cd = `aa[2].dina_k1`;
            var [cond,rslt] = creat_cols_for_back(cd,scheme,_parser);
            console.dir([cond,rslt],{depth:null});

            /*
                [ true, { cd: [ 'c4' ], hint: Hint { jpl: {}, jlit: {} } } ]
            */

            var cd = `extra[1.3]`;
            var [cond,rslt] = creat_cols_for_back(cd,scheme,_parser);
            console.dir([cond,rslt],{depth:null});

            /*
                [ false, '1.3 is not int ary index ' ]
            */


            var cd = `
                 extra.x,
                 extra.y,
                 aa[2].dina_k0,
                 as_json_leaf(dd.aind[2]).x[1]["2"]["x"],
                 as_json_leaf(dd.aind[2]).int,
                 aa[4],
                 aa[3],
                 dd.aind[0],
                 aa[0]
            `;

            var [cond,rslt] = creat_cols_for_back(cd,scheme,_parser);
            console.dir([cond,rslt],{depth:null});

            /*
                    [
                      true,
                      {
                        cd: [
                          'JPL0', 'JPL1',
                          'c3',   'JPL2',
                          'JPL3', 'c6',
                          'c5',   'c9',
                          'c1'
                        ],
                        hint: Hint {
                          jpl: {
                            JPL0: [ 'extra', 'x' ],
                            JPL1: [ 'extra', 'y' ],
                            JPL2: [ 'c11', 'x', 1, '2', 'x' ],
                            JPL3: [ 'c11', 'int' ]
                          },
                          jlit: {}
                        }
                      }
                    ]
            */

METHODS

APIS

            {
              _vali: {
                ERRD: {
                  unsupported: 'ast type must be Identifier OR SequenceExpression'
                },
                is_nd_safe: [Function: is_nd_safe]
              },
              creat_cols_for_back: [Function: creat_cols_for_back]
            }

LICENSE

• ISC