Method applyRuleEdits

internal/format/span.go:690–742

(rule *ruleImpl, previousRange TextRangeWithKind, previousStartLine int, currentRange TextRangeWithKind, currentStartLine int)

}

func (w *formatSpanWorker) applyRuleEdits(rule *ruleImpl, previousRange TextRangeWithKind, previousStartLine int, currentRange TextRangeWithKind, currentStartLine int) LineAction {
	onLaterLine := currentStartLine != previousStartLine
	switch rule.Action() {
	case ruleActionStopProcessingSpaceActions:
		// no action required
		return LineActionNone
	case ruleActionDeleteSpace:
		if previousRange.Loc.End() != currentRange.Loc.Pos() {
			// delete characters starting from t1.end up to t2.pos exclusive
			w.recordDelete(previousRange.Loc.End(), currentRange.Loc.Pos()-previousRange.Loc.End())
			if onLaterLine {
				return LineActionLineRemoved
			}
			return LineActionNone
		}
	case ruleActionDeleteToken:
		w.recordDelete(previousRange.Loc.Pos(), previousRange.Loc.Len())
	case ruleActionInsertNewLine:
		// exit early if we on different lines and rule cannot change number of newlines
		// if line1 and line2 are on subsequent lines then no edits are required - ok to exit
		// if line1 and line2 are separated with more than one newline - ok to exit since we cannot delete extra new lines
		if rule.Flags() != ruleFlagsCanDeleteNewLines && previousStartLine != currentStartLine {
			return LineActionNone
		}

		// edit should not be applied if we have one line feed between elements
		lineDelta := currentStartLine - previousStartLine
		if lineDelta != 1 {
			w.recordReplace(previousRange.Loc.End(), currentRange.Loc.Pos()-previousRange.Loc.End(), GetNewLineOrDefaultFromContext(w.ctx))
			if onLaterLine {
				return LineActionNone
			}
			return LineActionLineAdded
		}
	case ruleActionInsertSpace:
		// exit early if we on different lines and rule cannot change number of newlines
		if rule.Flags() != ruleFlagsCanDeleteNewLines && previousStartLine != currentStartLine {
			return LineActionNone
		}

		posDelta := currentRange.Loc.Pos() - previousRange.Loc.End()
		if posDelta != 1 || !strings.HasPrefix(w.sourceFile.Text()[previousRange.Loc.End():], " ") {
			w.recordReplace(previousRange.Loc.End(), posDelta, " ")
			if onLaterLine {
				return LineActionLineRemoved
			}
			return LineActionNone
		}
	case ruleActionInsertTrailingSemicolon:
		w.recordInsert(previousRange.Loc.End(), ";")
	}
	return LineActionNone
}

type LineAction int