483 lines
16 KiB
C
483 lines
16 KiB
C
#include "./get_changed_ranges.h"
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#include "./subtree.h"
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#include "./language.h"
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#include "./error_costs.h"
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#include "./tree_cursor.h"
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#include <assert.h>
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// #define DEBUG_GET_CHANGED_RANGES
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static void ts_range_array_add(TSRangeArray *self, Length start, Length end) {
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if (self->size > 0) {
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TSRange *last_range = array_back(self);
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if (start.bytes <= last_range->end_byte) {
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last_range->end_byte = end.bytes;
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last_range->end_point = end.extent;
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return;
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}
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}
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if (start.bytes < end.bytes) {
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TSRange range = { start.extent, end.extent, start.bytes, end.bytes };
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array_push(self, range);
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}
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}
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bool ts_range_array_intersects(const TSRangeArray *self, unsigned start_index,
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uint32_t start_byte, uint32_t end_byte) {
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for (unsigned i = start_index; i < self->size; i++) {
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TSRange *range = &self->contents[i];
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if (range->end_byte > start_byte) {
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if (range->start_byte >= end_byte) break;
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return true;
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}
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}
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return false;
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}
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void ts_range_array_get_changed_ranges(
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const TSRange *old_ranges, unsigned old_range_count,
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const TSRange *new_ranges, unsigned new_range_count,
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TSRangeArray *differences
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) {
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unsigned new_index = 0;
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unsigned old_index = 0;
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Length current_position = length_zero();
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bool in_old_range = false;
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bool in_new_range = false;
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while (old_index < old_range_count || new_index < new_range_count) {
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const TSRange *old_range = &old_ranges[old_index];
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const TSRange *new_range = &new_ranges[new_index];
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Length next_old_position;
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if (in_old_range) {
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next_old_position = (Length) {old_range->end_byte, old_range->end_point};
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} else if (old_index < old_range_count) {
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next_old_position = (Length) {old_range->start_byte, old_range->start_point};
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} else {
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next_old_position = LENGTH_MAX;
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}
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Length next_new_position;
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if (in_new_range) {
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next_new_position = (Length) {new_range->end_byte, new_range->end_point};
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} else if (new_index < new_range_count) {
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next_new_position = (Length) {new_range->start_byte, new_range->start_point};
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} else {
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next_new_position = LENGTH_MAX;
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}
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if (next_old_position.bytes < next_new_position.bytes) {
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if (in_old_range != in_new_range) {
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ts_range_array_add(differences, current_position, next_old_position);
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}
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if (in_old_range) old_index++;
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current_position = next_old_position;
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in_old_range = !in_old_range;
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} else if (next_new_position.bytes < next_old_position.bytes) {
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if (in_old_range != in_new_range) {
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ts_range_array_add(differences, current_position, next_new_position);
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}
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if (in_new_range) new_index++;
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current_position = next_new_position;
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in_new_range = !in_new_range;
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} else {
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if (in_old_range != in_new_range) {
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ts_range_array_add(differences, current_position, next_new_position);
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}
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if (in_old_range) old_index++;
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if (in_new_range) new_index++;
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in_old_range = !in_old_range;
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in_new_range = !in_new_range;
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current_position = next_new_position;
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}
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}
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}
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typedef struct {
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TreeCursor cursor;
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const TSLanguage *language;
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unsigned visible_depth;
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bool in_padding;
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} Iterator;
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static Iterator iterator_new(TreeCursor *cursor, const Subtree *tree, const TSLanguage *language) {
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array_clear(&cursor->stack);
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array_push(&cursor->stack, ((TreeCursorEntry){
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.subtree = tree,
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.position = length_zero(),
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.child_index = 0,
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.structural_child_index = 0,
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}));
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return (Iterator) {
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.cursor = *cursor,
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.language = language,
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.visible_depth = 1,
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.in_padding = false,
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};
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}
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static bool iterator_done(Iterator *self) {
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return self->cursor.stack.size == 0;
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}
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static Length iterator_start_position(Iterator *self) {
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TreeCursorEntry entry = *array_back(&self->cursor.stack);
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if (self->in_padding) {
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return entry.position;
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} else {
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return length_add(entry.position, ts_subtree_padding(*entry.subtree));
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}
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}
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static Length iterator_end_position(Iterator *self) {
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TreeCursorEntry entry = *array_back(&self->cursor.stack);
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Length result = length_add(entry.position, ts_subtree_padding(*entry.subtree));
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if (self->in_padding) {
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return result;
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} else {
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return length_add(result, ts_subtree_size(*entry.subtree));
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}
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}
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static bool iterator_tree_is_visible(const Iterator *self) {
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TreeCursorEntry entry = *array_back(&self->cursor.stack);
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if (ts_subtree_visible(*entry.subtree)) return true;
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if (self->cursor.stack.size > 1) {
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Subtree parent = *self->cursor.stack.contents[self->cursor.stack.size - 2].subtree;
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const TSSymbol *alias_sequence = ts_language_alias_sequence(
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self->language,
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parent.ptr->production_id
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);
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return alias_sequence && alias_sequence[entry.structural_child_index] != 0;
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}
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return false;
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}
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static void iterator_get_visible_state(const Iterator *self, Subtree *tree,
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TSSymbol *alias_symbol, uint32_t *start_byte) {
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uint32_t i = self->cursor.stack.size - 1;
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if (self->in_padding) {
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if (i == 0) return;
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i--;
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}
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for (; i + 1 > 0; i--) {
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TreeCursorEntry entry = self->cursor.stack.contents[i];
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if (i > 0) {
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const Subtree *parent = self->cursor.stack.contents[i - 1].subtree;
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const TSSymbol *alias_sequence = ts_language_alias_sequence(
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self->language,
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parent->ptr->production_id
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);
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if (alias_sequence) {
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*alias_symbol = alias_sequence[entry.structural_child_index];
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}
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}
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if (ts_subtree_visible(*entry.subtree) || *alias_symbol) {
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*tree = *entry.subtree;
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*start_byte = entry.position.bytes;
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break;
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}
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}
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}
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static void iterator_ascend(Iterator *self) {
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if (iterator_done(self)) return;
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if (iterator_tree_is_visible(self) && !self->in_padding) self->visible_depth--;
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if (array_back(&self->cursor.stack)->child_index > 0) self->in_padding = false;
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self->cursor.stack.size--;
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}
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static bool iterator_descend(Iterator *self, uint32_t goal_position) {
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if (self->in_padding) return false;
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bool did_descend;
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do {
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did_descend = false;
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TreeCursorEntry entry = *array_back(&self->cursor.stack);
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Length position = entry.position;
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uint32_t structural_child_index = 0;
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for (uint32_t i = 0, n = ts_subtree_child_count(*entry.subtree); i < n; i++) {
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const Subtree *child = &entry.subtree->ptr->children[i];
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Length child_left = length_add(position, ts_subtree_padding(*child));
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Length child_right = length_add(child_left, ts_subtree_size(*child));
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if (child_right.bytes > goal_position) {
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array_push(&self->cursor.stack, ((TreeCursorEntry){
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.subtree = child,
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.position = position,
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.child_index = i,
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.structural_child_index = structural_child_index,
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}));
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if (iterator_tree_is_visible(self)) {
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if (child_left.bytes > goal_position) {
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self->in_padding = true;
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} else {
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self->visible_depth++;
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}
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return true;
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}
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did_descend = true;
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break;
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}
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position = child_right;
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if (!ts_subtree_extra(*child)) structural_child_index++;
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}
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} while (did_descend);
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return false;
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}
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static void iterator_advance(Iterator *self) {
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if (self->in_padding) {
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self->in_padding = false;
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if (iterator_tree_is_visible(self)) {
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self->visible_depth++;
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} else {
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iterator_descend(self, 0);
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}
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return;
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}
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for (;;) {
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if (iterator_tree_is_visible(self)) self->visible_depth--;
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TreeCursorEntry entry = array_pop(&self->cursor.stack);
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if (iterator_done(self)) return;
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const Subtree *parent = array_back(&self->cursor.stack)->subtree;
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uint32_t child_index = entry.child_index + 1;
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if (ts_subtree_child_count(*parent) > child_index) {
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Length position = length_add(entry.position, ts_subtree_total_size(*entry.subtree));
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uint32_t structural_child_index = entry.structural_child_index;
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if (!ts_subtree_extra(*entry.subtree)) structural_child_index++;
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const Subtree *next_child = &parent->ptr->children[child_index];
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array_push(&self->cursor.stack, ((TreeCursorEntry){
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.subtree = next_child,
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.position = position,
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.child_index = child_index,
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.structural_child_index = structural_child_index,
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}));
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if (iterator_tree_is_visible(self)) {
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if (ts_subtree_padding(*next_child).bytes > 0) {
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self->in_padding = true;
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} else {
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self->visible_depth++;
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}
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} else {
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iterator_descend(self, 0);
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}
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break;
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}
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}
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}
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typedef enum {
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IteratorDiffers,
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IteratorMayDiffer,
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IteratorMatches,
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} IteratorComparison;
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static IteratorComparison iterator_compare(const Iterator *old_iter, const Iterator *new_iter) {
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Subtree old_tree = NULL_SUBTREE;
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Subtree new_tree = NULL_SUBTREE;
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uint32_t old_start = 0;
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uint32_t new_start = 0;
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TSSymbol old_alias_symbol = 0;
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TSSymbol new_alias_symbol = 0;
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iterator_get_visible_state(old_iter, &old_tree, &old_alias_symbol, &old_start);
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iterator_get_visible_state(new_iter, &new_tree, &new_alias_symbol, &new_start);
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if (!old_tree.ptr && !new_tree.ptr) return IteratorMatches;
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if (!old_tree.ptr || !new_tree.ptr) return IteratorDiffers;
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if (
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old_alias_symbol == new_alias_symbol &&
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ts_subtree_symbol(old_tree) == ts_subtree_symbol(new_tree)
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) {
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if (old_start == new_start &&
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!ts_subtree_has_changes(old_tree) &&
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ts_subtree_symbol(old_tree) != ts_builtin_sym_error &&
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ts_subtree_size(old_tree).bytes == ts_subtree_size(new_tree).bytes &&
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ts_subtree_parse_state(old_tree) != TS_TREE_STATE_NONE &&
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ts_subtree_parse_state(new_tree) != TS_TREE_STATE_NONE &&
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(ts_subtree_parse_state(old_tree) == ERROR_STATE) ==
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(ts_subtree_parse_state(new_tree) == ERROR_STATE)) {
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return IteratorMatches;
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} else {
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return IteratorMayDiffer;
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}
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}
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return IteratorDiffers;
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}
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#ifdef DEBUG_GET_CHANGED_RANGES
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static inline void iterator_print_state(Iterator *self) {
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TreeCursorEntry entry = *array_back(&self->cursor.stack);
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TSPoint start = iterator_start_position(self).extent;
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TSPoint end = iterator_end_position(self).extent;
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const char *name = ts_language_symbol_name(self->language, ts_subtree_symbol(*entry.subtree));
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printf(
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"(%-25s %s\t depth:%u [%u, %u] - [%u, %u])",
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name, self->in_padding ? "(p)" : " ",
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self->visible_depth,
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start.row + 1, start.column,
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end.row + 1, end.column
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);
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}
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#endif
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unsigned ts_subtree_get_changed_ranges(const Subtree *old_tree, const Subtree *new_tree,
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TreeCursor *cursor1, TreeCursor *cursor2,
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const TSLanguage *language,
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const TSRangeArray *included_range_differences,
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TSRange **ranges) {
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TSRangeArray results = array_new();
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Iterator old_iter = iterator_new(cursor1, old_tree, language);
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Iterator new_iter = iterator_new(cursor2, new_tree, language);
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unsigned included_range_difference_index = 0;
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Length position = iterator_start_position(&old_iter);
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Length next_position = iterator_start_position(&new_iter);
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if (position.bytes < next_position.bytes) {
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ts_range_array_add(&results, position, next_position);
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position = next_position;
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} else if (position.bytes > next_position.bytes) {
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ts_range_array_add(&results, next_position, position);
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next_position = position;
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}
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do {
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#ifdef DEBUG_GET_CHANGED_RANGES
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printf("At [%-2u, %-2u] Compare ", position.extent.row + 1, position.extent.column);
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iterator_print_state(&old_iter);
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printf("\tvs\t");
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iterator_print_state(&new_iter);
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puts("");
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#endif
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// Compare the old and new subtrees.
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IteratorComparison comparison = iterator_compare(&old_iter, &new_iter);
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// Even if the two subtrees appear to be identical, they could differ
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// internally if they contain a range of text that was previously
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// excluded from the parse, and is now included, or vice-versa.
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if (comparison == IteratorMatches && ts_range_array_intersects(
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included_range_differences,
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included_range_difference_index,
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position.bytes,
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iterator_end_position(&old_iter).bytes
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)) {
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comparison = IteratorMayDiffer;
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}
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bool is_changed = false;
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switch (comparison) {
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// If the subtrees are definitely identical, move to the end
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// of both subtrees.
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case IteratorMatches:
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next_position = iterator_end_position(&old_iter);
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break;
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// If the subtrees might differ internally, descend into both
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// subtrees, finding the first child that spans the current position.
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case IteratorMayDiffer:
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if (iterator_descend(&old_iter, position.bytes)) {
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if (!iterator_descend(&new_iter, position.bytes)) {
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is_changed = true;
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next_position = iterator_end_position(&old_iter);
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}
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} else if (iterator_descend(&new_iter, position.bytes)) {
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is_changed = true;
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next_position = iterator_end_position(&new_iter);
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} else {
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next_position = length_min(
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iterator_end_position(&old_iter),
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iterator_end_position(&new_iter)
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);
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}
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break;
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// If the subtrees are different, record a change and then move
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// to the end of both subtrees.
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case IteratorDiffers:
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is_changed = true;
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next_position = length_min(
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iterator_end_position(&old_iter),
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iterator_end_position(&new_iter)
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);
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break;
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}
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// Ensure that both iterators are caught up to the current position.
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while (
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!iterator_done(&old_iter) &&
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iterator_end_position(&old_iter).bytes <= next_position.bytes
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) iterator_advance(&old_iter);
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while (
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!iterator_done(&new_iter) &&
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iterator_end_position(&new_iter).bytes <= next_position.bytes
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) iterator_advance(&new_iter);
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// Ensure that both iterators are at the same depth in the tree.
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while (old_iter.visible_depth > new_iter.visible_depth) {
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iterator_ascend(&old_iter);
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}
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while (new_iter.visible_depth > old_iter.visible_depth) {
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iterator_ascend(&new_iter);
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}
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if (is_changed) {
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#ifdef DEBUG_GET_CHANGED_RANGES
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printf(
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" change: [[%u, %u] - [%u, %u]]\n",
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position.extent.row + 1, position.extent.column,
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next_position.extent.row + 1, next_position.extent.column
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);
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#endif
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ts_range_array_add(&results, position, next_position);
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}
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position = next_position;
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// Keep track of the current position in the included range differences
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// array in order to avoid scanning the entire array on each iteration.
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while (included_range_difference_index < included_range_differences->size) {
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const TSRange *range = &included_range_differences->contents[
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included_range_difference_index
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];
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if (range->end_byte <= position.bytes) {
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included_range_difference_index++;
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} else {
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break;
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}
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}
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} while (!iterator_done(&old_iter) && !iterator_done(&new_iter));
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Length old_size = ts_subtree_total_size(*old_tree);
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Length new_size = ts_subtree_total_size(*new_tree);
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if (old_size.bytes < new_size.bytes) {
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ts_range_array_add(&results, old_size, new_size);
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} else if (new_size.bytes < old_size.bytes) {
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ts_range_array_add(&results, new_size, old_size);
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}
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*cursor1 = old_iter.cursor;
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*cursor2 = new_iter.cursor;
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*ranges = results.contents;
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return results.size;
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}
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