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https://github.com/sqlitebrowser/sqlitebrowser.git
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cde2393539
This is a first rough implementation of QScintilla support as SQL text editor. It should work mostly and build fine with qmake as well as cmake. The new code supports all the features of the old one plus adding a few subtle improvements. The main point of this, however, is reducing the code we have to maintain and making it easier to add new features to the editor.
111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
// Scintilla source code edit control
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/** @file SparseState.h
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** Hold lexer state that may change rarely.
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** This is often per-line state such as whether a particular type of section has been entered.
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** A state continues until it is changed.
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**/
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// Copyright 2011 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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#ifndef SPARSESTATE_H
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#define SPARSESTATE_H
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#ifdef SCI_NAMESPACE
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namespace Scintilla {
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#endif
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template <typename T>
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class SparseState {
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struct State {
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int position;
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T value;
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State(int position_, T value_) : position(position_), value(value_) {
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}
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inline bool operator<(const State &other) const {
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return position < other.position;
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}
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inline bool operator==(const State &other) const {
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return (position == other.position) && (value == other.value);
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}
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};
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int positionFirst;
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typedef std::vector<State> stateVector;
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stateVector states;
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typename stateVector::iterator Find(int position) {
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State searchValue(position, T());
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return std::lower_bound(states.begin(), states.end(), searchValue);
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}
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public:
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explicit SparseState(int positionFirst_=-1) {
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positionFirst = positionFirst_;
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}
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void Set(int position, T value) {
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Delete(position);
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if (states.empty() || (value != states[states.size()-1].value)) {
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states.push_back(State(position, value));
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}
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}
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T ValueAt(int position) {
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if (states.empty())
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return T();
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if (position < states[0].position)
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return T();
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typename stateVector::iterator low = Find(position);
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if (low == states.end()) {
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return states[states.size()-1].value;
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} else {
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if (low->position > position) {
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--low;
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}
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return low->value;
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}
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}
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bool Delete(int position) {
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typename stateVector::iterator low = Find(position);
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if (low != states.end()) {
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states.erase(low, states.end());
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return true;
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}
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return false;
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}
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size_t size() const {
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return states.size();
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}
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// Returns true if Merge caused a significant change
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bool Merge(const SparseState<T> &other, int ignoreAfter) {
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// Changes caused beyond ignoreAfter are not significant
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Delete(ignoreAfter+1);
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bool different = true;
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bool changed = false;
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typename stateVector::iterator low = Find(other.positionFirst);
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if (static_cast<size_t>(states.end() - low) == other.states.size()) {
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// Same number in other as after positionFirst in this
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different = !std::equal(low, states.end(), other.states.begin());
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}
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if (different) {
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if (low != states.end()) {
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states.erase(low, states.end());
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changed = true;
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}
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typename stateVector::const_iterator startOther = other.states.begin();
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if (!states.empty() && !other.states.empty() && states.back().value == startOther->value)
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++startOther;
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if (startOther != other.states.end()) {
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states.insert(states.end(), startOther, other.states.end());
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changed = true;
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}
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}
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return changed;
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}
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};
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#ifdef SCI_NAMESPACE
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}
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#endif
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#endif
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