281 lines
7.2 KiB
C++
281 lines
7.2 KiB
C++
/** @file RunStyles.cxx
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** Data structure used to store sparse styles.
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**/
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// Copyright 1998-2007 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include "Platform.h"
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#include "Scintilla.h"
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#include "SplitVector.h"
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#include "Partitioning.h"
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#include "RunStyles.h"
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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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// Find the first run at a position
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int RunStyles::RunFromPosition(int position) const {
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int run = starts->PartitionFromPosition(position);
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// Go to first element with this position
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while ((run > 0) && (position == starts->PositionFromPartition(run-1))) {
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run--;
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}
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return run;
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}
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// If there is no run boundary at position, insert one continuing style.
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int RunStyles::SplitRun(int position) {
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int run = RunFromPosition(position);
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int posRun = starts->PositionFromPartition(run);
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if (posRun < position) {
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int runStyle = ValueAt(position);
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run++;
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starts->InsertPartition(run, position);
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styles->InsertValue(run, 1, runStyle);
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}
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return run;
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}
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void RunStyles::RemoveRun(int run) {
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starts->RemovePartition(run);
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styles->DeleteRange(run, 1);
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}
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void RunStyles::RemoveRunIfEmpty(int run) {
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if ((run < starts->Partitions()) && (starts->Partitions() > 1)) {
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if (starts->PositionFromPartition(run) == starts->PositionFromPartition(run+1)) {
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RemoveRun(run);
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}
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}
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}
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void RunStyles::RemoveRunIfSameAsPrevious(int run) {
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if ((run > 0) && (run < starts->Partitions())) {
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if (styles->ValueAt(run-1) == styles->ValueAt(run)) {
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RemoveRun(run);
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}
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}
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}
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RunStyles::RunStyles() {
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starts = new Partitioning(8);
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styles = new SplitVector<int>();
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styles->InsertValue(0, 2, 0);
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}
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RunStyles::~RunStyles() {
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delete starts;
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starts = NULL;
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delete styles;
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styles = NULL;
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}
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int RunStyles::Length() const {
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return starts->PositionFromPartition(starts->Partitions());
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}
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int RunStyles::ValueAt(int position) const {
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return styles->ValueAt(starts->PartitionFromPosition(position));
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}
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int RunStyles::FindNextChange(int position, int end) const {
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int run = starts->PartitionFromPosition(position);
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if (run < starts->Partitions()) {
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int runChange = starts->PositionFromPartition(run);
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if (runChange > position)
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return runChange;
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int nextChange = starts->PositionFromPartition(run + 1);
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if (nextChange > position) {
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return nextChange;
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} else if (position < end) {
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return end;
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} else {
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return end + 1;
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}
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} else {
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return end + 1;
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}
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}
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int RunStyles::StartRun(int position) const {
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return starts->PositionFromPartition(starts->PartitionFromPosition(position));
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}
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int RunStyles::EndRun(int position) const {
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return starts->PositionFromPartition(starts->PartitionFromPosition(position) + 1);
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}
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bool RunStyles::FillRange(int &position, int value, int &fillLength) {
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if (fillLength <= 0) {
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return false;
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}
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int end = position + fillLength;
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if (end > Length()) {
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return false;
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}
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int runEnd = RunFromPosition(end);
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if (styles->ValueAt(runEnd) == value) {
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// End already has value so trim range.
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end = starts->PositionFromPartition(runEnd);
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if (position >= end) {
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// Whole range is already same as value so no action
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return false;
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}
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fillLength = end - position;
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} else {
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runEnd = SplitRun(end);
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}
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int runStart = RunFromPosition(position);
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if (styles->ValueAt(runStart) == value) {
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// Start is in expected value so trim range.
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runStart++;
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position = starts->PositionFromPartition(runStart);
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fillLength = end - position;
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} else {
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if (starts->PositionFromPartition(runStart) < position) {
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runStart = SplitRun(position);
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runEnd++;
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}
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}
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if (runStart < runEnd) {
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styles->SetValueAt(runStart, value);
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// Remove each old run over the range
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for (int run=runStart+1; run<runEnd; run++) {
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RemoveRun(runStart+1);
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}
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runEnd = RunFromPosition(end);
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RemoveRunIfSameAsPrevious(runEnd);
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RemoveRunIfSameAsPrevious(runStart);
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runEnd = RunFromPosition(end);
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RemoveRunIfEmpty(runEnd);
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return true;
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} else {
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return false;
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}
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}
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void RunStyles::SetValueAt(int position, int value) {
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int len = 1;
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FillRange(position, value, len);
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}
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void RunStyles::InsertSpace(int position, int insertLength) {
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int runStart = RunFromPosition(position);
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if (starts->PositionFromPartition(runStart) == position) {
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int runStyle = ValueAt(position);
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// Inserting at start of run so make previous longer
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if (runStart == 0) {
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// Inserting at start of document so ensure 0
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if (runStyle) {
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styles->SetValueAt(0, 0);
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starts->InsertPartition(1, 0);
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styles->InsertValue(1, 1, runStyle);
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starts->InsertText(0, insertLength);
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} else {
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starts->InsertText(runStart, insertLength);
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}
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} else {
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if (runStyle) {
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starts->InsertText(runStart-1, insertLength);
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} else {
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// Insert at end of run so do not extend style
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starts->InsertText(runStart, insertLength);
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}
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}
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} else {
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starts->InsertText(runStart, insertLength);
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}
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}
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void RunStyles::DeleteAll() {
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delete starts;
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starts = NULL;
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delete styles;
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styles = NULL;
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starts = new Partitioning(8);
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styles = new SplitVector<int>();
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styles->InsertValue(0, 2, 0);
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}
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void RunStyles::DeleteRange(int position, int deleteLength) {
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int end = position + deleteLength;
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int runStart = RunFromPosition(position);
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int runEnd = RunFromPosition(end);
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if (runStart == runEnd) {
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// Deleting from inside one run
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starts->InsertText(runStart, -deleteLength);
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RemoveRunIfEmpty(runStart);
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} else {
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runStart = SplitRun(position);
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runEnd = SplitRun(end);
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starts->InsertText(runStart, -deleteLength);
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// Remove each old run over the range
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for (int run=runStart; run<runEnd; run++) {
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RemoveRun(runStart);
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}
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RemoveRunIfEmpty(runStart);
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RemoveRunIfSameAsPrevious(runStart);
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}
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}
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int RunStyles::Runs() const {
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return starts->Partitions();
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}
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bool RunStyles::AllSame() const {
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for (int run = 1; run < starts->Partitions(); run++) {
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if (styles->ValueAt(run) != styles->ValueAt(run - 1))
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return false;
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}
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return true;
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}
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bool RunStyles::AllSameAs(int value) const {
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return AllSame() && (styles->ValueAt(0) == value);
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}
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int RunStyles::Find(int value, int start) const {
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if (start < Length()) {
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int run = start ? RunFromPosition(start) : 0;
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if (styles->ValueAt(run) == value)
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return start;
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run++;
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while (run < starts->Partitions()) {
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if (styles->ValueAt(run) == value)
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return starts->PositionFromPartition(run);
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run++;
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}
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}
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return -1;
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}
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void RunStyles::Check() const {
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if (Length() < 0) {
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throw std::runtime_error("RunStyles: Length can not be negative.");
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}
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if (starts->Partitions() < 1) {
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throw std::runtime_error("RunStyles: Must always have 1 or more partitions.");
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}
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if (starts->Partitions() != styles->Length()-1) {
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throw std::runtime_error("RunStyles: Partitions and styles different lengths.");
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}
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int start=0;
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while (start < Length()) {
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int end = EndRun(start);
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if (start >= end) {
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throw std::runtime_error("RunStyles: Partition is 0 length.");
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}
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start = end;
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}
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if (styles->ValueAt(styles->Length()-1) != 0) {
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throw std::runtime_error("RunStyles: Unused style at end changed.");
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}
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for (int j=1; j<styles->Length()-1; j++) {
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if (styles->ValueAt(j) == styles->ValueAt(j-1)) {
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throw std::runtime_error("RunStyles: Style of a partition same as previous.");
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}
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}
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}
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