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/* Author: Denis Paluca, TU Muenchen
Non-unicode Isabelle symbols as text decorations.
*/
'use strict';
import { DecorationRangeBehavior, ExtensionContext, Range,
TextDocument, TextEditor, window, workspace } from 'vscode'
import * as symbol from './symbol'
const arrows = {
sub: symbol.control.sub.decoded,
sup: symbol.control.sup.decoded,
bold: symbol.control.bold.decoded,
bsub: symbol.control.bsub.decoded,
esub: symbol.control.esub.decoded,
bsup: symbol.control.bsup.decoded,
esup: symbol.control.esup.decoded
}
const no_hide_list = [' ', '\n', '\r', ...Object.values(arrows)]
function should_hide(next_char: string): boolean
{
return !no_hide_list.includes(next_char)
}
function find_closing(close: string, text: string, open_index: number): number | undefined
{
let close_index = open_index
let counter = 1
const open = text[open_index]
while (counter > 0) {
let c = text[++close_index]
if (c === undefined) return
if (c === open) {
counter++
}
else if (c === close) {
counter--
}
}
return close_index
}
function extract_ranges(doc: TextDocument)
{
const text = doc.getText()
const hide_ranges: Range[] = []
const sup_ranges: Range[] = []
const sub_ranges: Range[] = []
const bold_ranges: Range[] = []
for (let i = 0; i < text.length - 1; i++) {
switch (text[i]) {
case arrows.sup:
case arrows.sub:
case arrows.bold:
if (should_hide(text[i + 1])) {
const pos_mid = doc.positionAt(i + 1)
hide_ranges.push(new Range(doc.positionAt(i), pos_mid));
(text[i] === arrows.sub ? sub_ranges : (text[i] === arrows.sup ? sup_ranges : bold_ranges))
.push(new Range(pos_mid, doc.positionAt(i + 2)))
i++
}
break
case arrows.bsup:
case arrows.bsub:
const close = text[i] === arrows.bsub ? arrows.esub : arrows.bsup
const script_ranges = text[i] === arrows.bsub ? sub_ranges : sup_ranges
const close_index = find_closing(close, text, i)
if (close_index && close_index - i > 1) {
const pos_start = doc.positionAt(i + 1)
const pos_end = doc.positionAt(close_index)
hide_ranges.push(
new Range(doc.positionAt(i), pos_start),
new Range(pos_end, doc.positionAt(close_index + 1))
)
script_ranges.push(new Range(pos_start, pos_end))
i = close_index
}
break
default:
break
}
}
return { hide_ranges: hide_ranges, superscript_ranges: sup_ranges, subscript_ranges: sub_ranges, bold_ranges: bold_ranges }
}
export function register_script_decorations(context: ExtensionContext)
{
const hide = window.createTextEditorDecorationType({
textDecoration: 'none; font-size: 0.001em',
rangeBehavior: DecorationRangeBehavior.ClosedClosed
})
const superscript = window.createTextEditorDecorationType({
textDecoration: 'none; position: relative; top: -0.5em; font-size: 80%'
})
const subscript = window.createTextEditorDecorationType({
textDecoration: 'none; position: relative; bottom: -0.5em; font-size: 80%'
})
const bold = window.createTextEditorDecorationType({
textDecoration: 'none; font-weight: bold'
})
const set_editor_decorations = (editor: TextEditor, doc: TextDocument) =>
{
const { hide_ranges: hideRanges, superscript_ranges: superscriptRanges, subscript_ranges: subscriptRanges, bold_ranges: boldRanges } = extract_ranges(doc)
editor.setDecorations(hide, hideRanges)
editor.setDecorations(superscript, superscriptRanges)
editor.setDecorations(subscript, subscriptRanges)
editor.setDecorations(bold, boldRanges)
}
context.subscriptions.push(
hide, superscript, subscript, bold,
window.onDidChangeActiveTextEditor(editor =>
{
if (!editor) {
return
}
const doc = editor.document
set_editor_decorations(editor, doc)
}),
workspace.onDidChangeTextDocument(({ document}) =>
{
for (const editor of window.visibleTextEditors) {
if (editor.document.uri.toString() === document.uri.toString()) {
set_editor_decorations(editor, document)
}
}
})
)
}
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