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Add basic autocompletion for keywords

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Alan Bernstein 2017-04-26 14:06:03 -05:00
parent a8453d7656
commit 69b17dfca8
1 changed files with 43 additions and 0 deletions
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43
webui/assets/main.js
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@ -11,10 +11,25 @@ class REPL {
bind_events() {
const repl = this
const keys = {
TAB: 9,
ENTER: 13,
UP_ARROW: 38,
DOWN_ARROW: 40
}
const keywords = {
// keyword: length of substring that comes after cursor
"SetBit()": 1,
"ClearBit()": 1,
"SetBitmapAttrs()": 1,
"Bitmap()": 1,
"Union()": 1,
"Intersect()": 1,
"Difference()": 1,
"Count()": 1,
"Range()": 1,
"TopN()": 1,
"frame=": 0,
}
this.input.addEventListener("keydown", (e) => {
if (e.keyCode == keys.UP_ARROW) {
@ -52,6 +67,34 @@ class REPL {
e.preventDefault()
this.submit();
}
if (e.keyCode == keys.TAB) {
e.preventDefault()
// extract word ending at cursor
var word_start = this.input.selectionEnd-1
while(word_start>0) {
var c = this.input.value.charCodeAt(word_start)
if(!((c>64 && c<91) || (c>96 && c<123))) {
word_start++
break
}
word_start--
}
var input_word = this.input.value.substring(word_start, this.input.selectionEnd)
console.log(word_start, input_word)
// check for keyword match and insert
// this just stops at the first match
for(var keyword in keywords) {
if(keyword.startsWith(input_word)){
var completion = keyword.substring(input_word.length)
this.input.value += completion
var pos = this.input.value.length - keywords[keyword]
this.input.setSelectionRange(pos, pos)
break
}
}
}
})
this.button.onclick = function() {
repl.submit();