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