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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