"use strict";

// Bytecode instruction opcodes.
const opcodes = {

    // Stack Manipulation

    PUSH_EMPTY_STRING: 0,    // PUSH_EMPTY_STRING
    PUSH_UNDEFINED:    1,    // PUSH_UNDEFINED
    PUSH_NULL:         2,    // PUSH_NULL
    PUSH_FAILED:       3,    // PUSH_FAILED
    PUSH_EMPTY_ARRAY:  4,    // PUSH_EMPTY_ARRAY
    PUSH_CURR_POS:     5,    // PUSH_CURR_POS
    POP:               6,    // POP
    POP_CURR_POS:      7,    // POP_CURR_POS
    POP_N:             8,    // POP_N n
    NIP:               9,    // NIP
    APPEND:            10,   // APPEND
    WRAP:              11,   // WRAP n
    TEXT:              12,   // TEXT
    PLUCK:             41,   // PLUCK n, k, p1, ..., pK

    // Conditions and Loops

    IF:                13,   // IF t, f
    IF_ERROR:          14,   // IF_ERROR t, f
    IF_NOT_ERROR:      15,   // IF_NOT_ERROR t, f
    WHILE_NOT_ERROR:   16,   // WHILE_NOT_ERROR b

    // Matching

    MATCH_ANY:         17,   // MATCH_ANY a, f, ...
    MATCH_STRING:      18,   // MATCH_STRING s, a, f, ...
    MATCH_STRING_IC:   19,   // MATCH_STRING_IC s, a, f, ...
    MATCH_CLASS:       20,   // MATCH_CLASS c, a, f, ...
    ACCEPT_N:          21,   // ACCEPT_N n
    ACCEPT_STRING:     22,   // ACCEPT_STRING s
    EXPECT:            23,   // EXPECT e

    // Calls

    LOAD_SAVED_POS:    24,   // LOAD_SAVED_POS p
    UPDATE_SAVED_POS:  25,   // UPDATE_SAVED_POS
    CALL:              26,   // CALL f, n, pc, p1, p2, ..., pN

    // Rules

    RULE:              27,   // RULE r

    // Failure Reporting

    SILENT_FAILS_ON:   28,   // SILENT_FAILS_ON
    SILENT_FAILS_OFF:  29,   // SILENT_FAILS_OFF

    EXPECT_NS_BEGIN:   38,   // EXPECT_NS_BEGIN
    EXPECT_NS_END:     39,    // EXPECT_NS_END invert

};

module.exports = opcodes;