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index.js
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index.js
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var tokenize = require('js-tokenizer')
var h = require('hyperscript')
var a = require('adiff')
var splice = require('element-splice')
module.exports = function () {
var ta, cursor = h('span.cursor', {style: {
position: 'absolute'
}}, '_')
var pre = h('pre.code', {onclick: function () {
ta.focus()
},
style: {
//not sure why this doesn't work...
// position:'absolute',
// left: '0px', top: '0px',
// width: '100%', height: '100%',
overflow: 'auto',
//this works, but then I don't know where to put the cursor.
// 'white-space': 'pre-wrap'
//so, currently there is no wrapping...
}
}, cursor)
function move () {
var rect = cursor.getBoundingClientRect()
var lines = ta.value.substring(0, ta.selectionEnd).split('\n')
var last = lines.length - 1
var computed = getComputedStyle(pre)
cursor.style.top = parseInt(computed['padding-top'])
+ (last * rect.height) + 'px'
cursor.style.left = parseInt(computed['padding-left'])
+ (lines[last].length * rect.width) + 'px'
;['font-size',
'padding-top',
'padding-left',
'padding-right',
'padding-bottom'
].forEach(function (e) {
ta.style[e] = computed[e]
})
//obviously, doing stuff like this everytime you press a button is pretty dumb.
//fix later!
var lines = ta.value.split('\n')
var height = lines.length
var width = lines.sort(function (a, b) { return b.length - a.length }).shift().length
var h = Math.max(height * rect.height, 400)
var w = Math.max(width * rect.width , rect.width*80)
pre.style.height = h + 'px'
pre.style.width = w + 'px'
ta.style.height = h + 'px'
ta.style.width = w + 'px'
}
var prev = []
function update () {
pre.removeChild(cursor)
//this is an improvement on what it was like before.
//still, maybe there is a faster way to detect what has been typed?
//hmm, compare the selection start,end from lasttime!
var tokens = tokenize(ta.value || '', true)
var patch = a.diff(prev, tokens)
patch.forEach(function (p) {
p = p.slice(0, 2).concat(p.slice(2).map(function (e) {
return h('span.'+tokenize.type(e), e)
}))
splice(pre, p)
})
pre.appendChild(cursor)
prev = tokens
move()
}
ta = h('textarea.code', {
oninput: update,
onkeydown: move,
onkeyup: move,
onclick: move,
style: {
'z-index' : 1
, position : 'absolute'
, background : 'transparent'
, color : 'transparent'
, 'font-family': 'monospace'
, margin : '0px'
, padding : '0px'
, border : 'none'
, 'font-size' : getComputedStyle(pre)['font-size']
, resize: 'none'
, left: '0px', top: '0px'
},
wrap: 'off'
})
process.nextTick(update)
//default highlighting. move this to a css file...
var style = h('style',
'.punct {color: grey}'
, '.string1, .string2 {color: yellow}'
, '.number {color: orange}'
, '.keyword {color: green}'
, '.comment1, .comment2 {color: blue}'
, '.regexp {color: lightblue}'
, '.invalid {background: red}'
, '.name {color: #ccc}'
, '.code {background: #333; padding: 10px}'
, '.cursor {background: hsla(0, 0%, 100%, 0.5)}'
)
return h('div', pre, ta, style,
{style: {
position: 'relative',
}}
)
}