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- import { getContextBefore } from "../line/highlight.js"
- import { Pos } from "../line/pos.js"
- import { getLine } from "../line/utils_line.js"
- import { replaceRange } from "../model/changes.js"
- import { Range } from "../model/selection.js"
- import { replaceOneSelection } from "../model/selection_updates.js"
- import { countColumn, Pass, spaceStr } from "../util/misc.js"
- // Indent the given line. The how parameter can be "smart",
- // "add"/null, "subtract", or "prev". When aggressive is false
- // (typically set to true for forced single-line indents), empty
- // lines are not indented, and places where the mode returns Pass
- // are left alone.
- export function indentLine(cm, n, how, aggressive) {
- let doc = cm.doc, state
- if (how == null) how = "add"
- if (how == "smart") {
- // Fall back to "prev" when the mode doesn't have an indentation
- // method.
- if (!doc.mode.indent) how = "prev"
- else state = getContextBefore(cm, n).state
- }
- let tabSize = cm.options.tabSize
- let line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize)
- if (line.stateAfter) line.stateAfter = null
- let curSpaceString = line.text.match(/^\s*/)[0], indentation
- if (!aggressive && !/\S/.test(line.text)) {
- indentation = 0
- how = "not"
- } else if (how == "smart") {
- indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text)
- if (indentation == Pass || indentation > 150) {
- if (!aggressive) return
- how = "prev"
- }
- }
- if (how == "prev") {
- if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize)
- else indentation = 0
- } else if (how == "add") {
- indentation = curSpace + cm.options.indentUnit
- } else if (how == "subtract") {
- indentation = curSpace - cm.options.indentUnit
- } else if (typeof how == "number") {
- indentation = curSpace + how
- }
- indentation = Math.max(0, indentation)
- let indentString = "", pos = 0
- if (cm.options.indentWithTabs)
- for (let i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t"}
- if (pos < indentation) indentString += spaceStr(indentation - pos)
- if (indentString != curSpaceString) {
- replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input")
- line.stateAfter = null
- return true
- } else {
- // Ensure that, if the cursor was in the whitespace at the start
- // of the line, it is moved to the end of that space.
- for (let i = 0; i < doc.sel.ranges.length; i++) {
- let range = doc.sel.ranges[i]
- if (range.head.line == n && range.head.ch < curSpaceString.length) {
- let pos = Pos(n, curSpaceString.length)
- replaceOneSelection(doc, i, new Range(pos, pos))
- break
- }
- }
- }
- }
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