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1 import { getContextBefore } from "../line/highlight.js"
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2 import { Pos } from "../line/pos.js"
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3 import { getLine } from "../line/utils_line.js"
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4 import { replaceRange } from "../model/changes.js"
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5 import { Range } from "../model/selection.js"
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6 import { replaceOneSelection } from "../model/selection_updates.js"
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7 import { countColumn, Pass, spaceStr } from "../util/misc.js"
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8
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9 // Indent the given line. The how parameter can be "smart",
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10 // "add"/null, "subtract", or "prev". When aggressive is false
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11 // (typically set to true for forced single-line indents), empty
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12 // lines are not indented, and places where the mode returns Pass
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13 // are left alone.
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14 export function indentLine(cm, n, how, aggressive) {
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15 let doc = cm.doc, state
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16 if (how == null) how = "add"
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17 if (how == "smart") {
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18 // Fall back to "prev" when the mode doesn't have an indentation
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19 // method.
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20 if (!doc.mode.indent) how = "prev"
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21 else state = getContextBefore(cm, n).state
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22 }
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23
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24 let tabSize = cm.options.tabSize
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25 let line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize)
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26 if (line.stateAfter) line.stateAfter = null
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27 let curSpaceString = line.text.match(/^\s*/)[0], indentation
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28 if (!aggressive && !/\S/.test(line.text)) {
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29 indentation = 0
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30 how = "not"
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31 } else if (how == "smart") {
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32 indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text)
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33 if (indentation == Pass || indentation > 150) {
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34 if (!aggressive) return
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35 how = "prev"
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36 }
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37 }
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38 if (how == "prev") {
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39 if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize)
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40 else indentation = 0
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41 } else if (how == "add") {
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42 indentation = curSpace + cm.options.indentUnit
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43 } else if (how == "subtract") {
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44 indentation = curSpace - cm.options.indentUnit
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45 } else if (typeof how == "number") {
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46 indentation = curSpace + how
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47 }
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48 indentation = Math.max(0, indentation)
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49
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50 let indentString = "", pos = 0
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51 if (cm.options.indentWithTabs)
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52 for (let i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t"}
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53 if (pos < indentation) indentString += spaceStr(indentation - pos)
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54
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55 if (indentString != curSpaceString) {
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56 replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input")
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57 line.stateAfter = null
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58 return true
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59 } else {
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60 // Ensure that, if the cursor was in the whitespace at the start
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61 // of the line, it is moved to the end of that space.
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62 for (let i = 0; i < doc.sel.ranges.length; i++) {
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63 let range = doc.sel.ranges[i]
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64 if (range.head.line == n && range.head.ch < curSpaceString.length) {
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65 let pos = Pos(n, curSpaceString.length)
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66 replaceOneSelection(doc, i, new Range(pos, pos))
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67 break
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68 }
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69 }
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70 }
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71 }
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