function parse(text) {
    // https://github.com/shioyadan/Konata/blob/master/docs/kanata-log-format.md

    const before = performance.now();

    let line_start = 0;
    let line_index = 0;
    let c = -1;

    const instructions = {};

    //console.log(text);

    for (let i = 0; i < text.length; ++i) {
        if (text[i] === '\n') {
            // TODO: speed
            const line_copy = text.substring(line_start, i);
            const line_parts = line_copy.split(/\t/);

            if (line_parts.length === 0) {
                console.error('Parser error: empty line');
            }

            const command = line_parts[0];
            switch (command) {
                case 'C=': {
                    // Specify the number of cycles since the start of simulation.
                    if (!assert_arglen(line_parts, 1, 'C=')) return false;

                    const cycles = Number(line_parts[1]);
                    c = cycles;

                    break;
                }

                case 'C': {
                    // Specifies the number of elapsed cycles since the last output of any commands.
                    if (!assert_arglen(line_parts, 1, 'C')) return false;

                    const cycles = Number(line_parts[1]);
                    c += cycles;

                    break;
                }

                case 'I': {
                    if (!assert_arglen(line_parts, 3, 'I')) return false;

                    const insn_id_in_file = Number(line_parts[1]);
                    const insn_id_in_sim = Number(line_parts[2]);
                    const thread_id = Number(line_parts[3]);

                    instructions[insn_id_in_file] = {
                        'cycle': c,
                        'file_id': insn_id_in_file,
                        'sim_id': insn_id_in_sim,
                        'thread_id': thread_id,
                        'text': '',
                        'popover_text': '',
                        'lanes': {'0': [], '1': []},
                    };

                    break;
                }

                case 'L': {
                    if (!assert_arglenmin(line_parts, 3, 'L')) return false;

                    const id = Number(line_parts[1]);
                    const type = Number(line_parts[2]);
                    const text = line_parts[3].replaceAll('\\n', '\n');

                    if (id in instructions) {
                        if (type === 0) {
                            instructions[id].text += text;
                        } else {
                            instructions[id].popover_text += text;
                        }
                    } else {
                        console.error('Parser error: label for an instruction that does not exist');
                    }

                    break;
                }

                case 'S': {
                    if (!assert_arglen(line_parts, 3, 'S')) return false;

                    const id = Number(line_parts[1]);
                    const lane = Number(line_parts[2]);
                    const stage = line_parts[3];


                    if (id in instructions) {
                        if (!(lane in instructions[id].lanes)) {
                            instructions[id].lanes[lane] = [];
                        }

                        instructions[id].lanes[lane].push({
                            'name': stage,
                            'c': c,
                        });
                    } else {
                        console.error('Parser error: pipeline start for an instruction that does not exist');
                    }


                    break;
                }

                case 'E': {
                    if (!assert_arglen(line_parts, 3, 'E')) return false;

                    const id = Number(line_parts[1]);
                    const lane = Number(line_parts[2]);
                    const stage = line_parts[3];

                    // This command can be ommited

                    break;
                }

                case 'R': {
                    if (!assert_arglen(line_parts, 3, 'R')) return false;

                    const id = Number(line_parts[1]);
                    const retire_id = Number(line_parts[2]);
                    const type = Number(line_parts[3]);

                    if (id in instructions) {
                        if (type === 0) {
                            instructions[id].retired = true;
                        } else {
                            instructions[id].retired = false;
                        }
                        instructions[id].retcyc = c;
                    } else {
                        console.error('Parser error: retire for an instruction that does not exist');
                    }

                    break;
                }

                case 'W': {
                    if (!assert_arglen(line_parts, 3, 'W')) return false;

                    const consumer_id = Number(line_parts[1]);
                    const producer_id = Number(line_parts[2]);
                    const type = Number(line_parts[3]);
                    
                    // TODO

                    break;
                }

                default: {
                    console.error('Parser error: unexpected command', command);
                }
            }

            line_start = i + 1;
            line_index += 1;
        }
    }


    traces['0'] = {
        // The fact these are sorted is used extensively over the code
        'raw': Object.values(instructions).sort((a, b) => a.cycle - b.cycle),
    };


    traces['0'].geo = generate('0');

    const after = performance.now();
    console.log(`Parsed in ${Math.round(after - before)}ms`);

    return true;
}

function assert_arglen(args, arglen, command) {
    if (args.length !== arglen + 1) {
        console.error(`Parser error: command ${command} requires ${arglen} argument(s)`);
        return false;
    }

    return true;
}

function assert_arglenmin(args, arglen, command) {
    if (args.length < arglen + 1) {
        console.error(`Parser error: command ${command} requires at least ${arglen} argument(s)`);
        return false;
    }

    return true;
}