lqt0223

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define B64_UNIT_BYTE_SIZE 3

int b64_readbytes(char* src, int count) {
  int result = 0;
  for (int i = 0; i < count; i++, src++) {
    result += *src;

lqt0223

// tiny-compiler
// a coding practice based on mgechev/tiny-compiler: https://github.com/mgechev/tiny-compiler/blob/master/tiny.js
// accepting expression like 'mul 2 3'(operator prefixed) and evaluate result
// (or transpile it into normal arithmetic expression (operator in the middle))

const OPERATIONS = ['add', 'sub', 'mul', 'div']

const OP_MAP = {
  add: (a, b) => a + b,
  sub: (a, b) => a - b,

lqt0223

// a very simplified FFMPEG decoding bootstrap code (without any error handling...)

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>

int main(int argc, const char *argv[])
{
  // register formats
  av_register_all();

lqt0223

// A coding exercise of implementing a XML parser
// Caution: this is not a full implementation. Some features(ex. self-closing tag) are not implemented.
// Further tests need to be done

function xml_parse(xml) {
  var i = 0
  var ch = xml[i]
  var focusedNode
  function next(c) {
    if (c) {

lqt0223

function json_stringify(json, indent) {
  var str = ''
  var stack_dep = 0

  function getSpaces(length) {
    var spaces = new Array(length)
    spaces.fill(' ')
    return spaces.join('')
  }

lqt0223

// This is a coding exercise of implementing a parser. Some minor parsing capabilities are not implemented.
// The algorithm are mainly from Douglas Crockford's 'https://github.com/douglascrockford/JSON-js/blob/master/json_parse.js'

function json_parse(str) {
  var i = 0
  var ch = str[i]

  // core function that recursively called to move forward scanning pointers and accept tokens
  function next(c) {
    if (c) {

lqt0223

// Running asynchronous jobs in sequence (without paralleling)
// A Promise based implementation

// The 'sequence' function receive an array and an iteratee as parameters.
// The iteratee is a function that returns a promise.
// You should incapsulate your desired asynchronous job in this function.
// The array is the parameters for the iteratee function in order.

// The 'sequence' function returns a promise to make it thenable.
// The promise will resolve all results of asynchronous jobs in an array,

lqt0223

实现一个页面缓存、左滑返回的navigator

前言

本文将介绍如何在不使用vue-router提供的router-view的情况下，实现一个渲染路由对应组件的navigator控件，并逐步增加主副舞台区分、页面缓存、页面切换动画、左滑返回支持等功能。

本组件的源码位于我的github: https://github.com/lqt0223/navigator-demo/blob/master/src/components/Navigator.vue

本组件的demo: https://navigator-demo.herokuapp.com/#/view1 （建议在移动设备上打开（在iOS设备上使用Safari等浏览器打开时可能遇到左滑返回冲突的问题），或使用chrome dev tool，在手机模式下打开以支持触摸事件）

lqt0223

A navigator component written in Vue

• Use it with vue-router...
• When navigating, any new view is pushed into view stack.
• You can specify 'main' routes, whose view will not be stacked.
• Transition is not implemented. Please use transition hook methods.

Usage example:

<template>

lqt0223

function EventEmitter () {
  var eventStorage = {}

  this.on = function(event, handler) {
    if(!eventStorage[event]) eventStorage[event] = []
    eventStorage[event].push(handler)
  }

  this.emit = function(event) {
    var events = eventStorage[event]