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Fix error in changed ranges calculation

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There was an error in the way that we calculate the reference
scope sequences that are used as the basis for assertions about
changed ranges in randomized tests. The error caused some
characters' scopes to not be checked. This corrects the reference
implementation and fixes a previously uncaught bug in the
implementation of `tree_path_get_changed_ranges`.

Previously, when iterating over the old and new trees, we would
only perform comparisons of visible nodes. This resulted in a failure
to do any comparison for portions of the text in which there were
trailing invisible child nodes (e.g. trailing `_line_break` nodes
inside `statement` nodes in the JavaScript grammar).

Now, we additionally perform comparisons at invisible leaf nodes,
based on their lowest visible ancestor.
This commit is contained in:
Max Brunsfeld 2017-01-24 12:48:47 -08:00
parent 0a286d41f3
commit 896254eea5
4 changed files with 86 additions and 74 deletions
Download patch file Download diff file Expand all files Collapse all files

122
src/runtime/tree_path.h
View file

@ -21,61 +21,66 @@ static void range_array_add(RangeArray *results, TSPoint start, TSPoint end) {
}
}
static bool tree_path_descend(TreePath *path, TSPoint position) {
static bool tree_path_descend(TreePath *path, Length position) {
uint32_t original_size = path->size;
bool did_descend;
do {
did_descend = false;
TreePathEntry entry = *array_back(path);
Length child_position = entry.position;
Length child_left = entry.position;
for (uint32_t i = 0; i < entry.tree->child_count; i++) {
Tree *child = entry.tree->children[i];
Length child_right_position =
length_add(child_position, ts_tree_total_size(child));
if (point_lt(position, child_right_position.extent)) {
TreePathEntry child_entry = { child, child_position, i };
if (child->visible) {
Length child_right = length_add(child_left, ts_tree_total_size(child));
if (position.bytes < child_right.bytes) {
TreePathEntry child_entry = { child, child_left, i };
if (child->visible || child->child_count == 0) {
array_push(path, child_entry);
return true;
} else if (child->child_count > 0 && child->visible_child_count > 0) {
} else if (child->visible_child_count > 0) {
array_push(path, child_entry);
did_descend = true;
break;
}
}
child_position = child_right_position;
child_left = child_right;
}
} while (did_descend);
path->size = original_size;
return false;
}
static uint32_t tree_path_advance(TreePath *path) {
uint32_t ascend_count = 0;
while (path->size > 0) {
TreePathEntry entry = array_pop(path);
if (path->size == 0)
break;
if (path->size == 0) break;
TreePathEntry parent_entry = *array_back(path);
if (parent_entry.tree->visible) ascend_count++;
Length position =
length_add(entry.position, ts_tree_total_size(entry.tree));
Length position = length_add(entry.position, ts_tree_total_size(entry.tree));
for (uint32_t i = entry.child_index + 1; i < parent_entry.tree->child_count; i++) {
Tree *next_child = parent_entry.tree->children[i];
if (next_child->visible || next_child->visible_child_count > 0) {
if (next_child->visible ||
next_child->child_count == 0 ||
next_child->visible_child_count > 0) {
if (parent_entry.tree->visible) ascend_count--;
array_push(path, ((TreePathEntry){
.tree = next_child,
.child_index = i,
.position = position,
}));
if (!next_child->visible)
tree_path_descend(path, (TSPoint){ 0, 0 });
if (!next_child->visible) {
tree_path_descend(path, length_zero());
}
return ascend_count;
}
position = length_add(position, ts_tree_total_size(next_child));
}
}
return ascend_count;
}
@ -94,8 +99,27 @@ static void tree_path_init(TreePath *path, Tree *tree) {
.position = { 0, 0, { 0, 0 } },
.child_index = 0,
}));
if (!tree->visible)
tree_path_descend(path, (TSPoint){ 0, 0 });
if (!tree->visible) {
tree_path_descend(path, length_zero());
}
}
Tree *tree_path_visible_tree(TreePath *self) {
for (uint32_t i = self->size - 1; i + 1 > 0; i--) {
Tree *tree = self->contents[i].tree;
if (tree->visible) return tree;
}
return NULL;
}
Length tree_path_start_position(TreePath *self) {
TreePathEntry entry = *array_back(self);
return length_add(entry.position, entry.tree->padding);
}
Length tree_path_end_position(TreePath *self) {
TreePathEntry entry = *array_back(self);
return length_add(length_add(entry.position, entry.tree->padding), entry.tree->size);
}
static bool tree_must_eq(Tree *old_tree, Tree *new_tree) {
@ -112,67 +136,59 @@ static bool tree_must_eq(Tree *old_tree, Tree *new_tree) {
static void tree_path_get_changes(TreePath *old_path, TreePath *new_path,
TSRange **ranges, uint32_t *range_count) {
TSPoint position = { 0, 0 };
Length position = length_zero();
RangeArray results = array_new();
while (old_path->size && new_path->size) {
bool is_changed = false;
TSPoint next_position = position;
Length next_position = position;
TreePathEntry old_entry = *array_back(old_path);
TreePathEntry new_entry = *array_back(new_path);
Tree *old_tree = old_entry.tree;
Tree *new_tree = new_entry.tree;
uint32_t old_start_byte = old_entry.position.bytes + old_tree->padding.bytes;
uint32_t new_start_byte = new_entry.position.bytes + new_tree->padding.bytes;
TSPoint old_start_point =
point_add(old_entry.position.extent, old_tree->padding.extent);
TSPoint new_start_point =
point_add(new_entry.position.extent, new_tree->padding.extent);
TSPoint old_end_point = point_add(old_start_point, old_tree->size.extent);
TSPoint new_end_point = point_add(new_start_point, new_tree->size.extent);
Tree *old_tree = tree_path_visible_tree(old_path);
Tree *new_tree = tree_path_visible_tree(new_path);
Length old_start = tree_path_start_position(old_path);
Length new_start = tree_path_start_position(new_path);
Length old_end = tree_path_end_position(old_path);
Length new_end = tree_path_end_position(new_path);
// #define NAME(t) (ts_language_symbol_name(language, ((Tree *)(t))->symbol))
// printf("At [%-2lu, %-2lu] Compare (%-20s\t [%-2lu, %-2lu] - [%lu, %lu])\tvs\t(%-20s\t [%lu, %lu] - [%lu, %lu])\n",
// position.row, position.column, NAME(old_tree), old_start_point.row,
// old_start_point.column, old_end_point.row, old_end_point.column,
// NAME(new_tree), new_start_point.row, new_start_point.column,
// new_end_point.row, new_end_point.column);
// printf("At [%-2u, %-2u] Compare (%-20s\t [%-2u, %-2u] - [%u, %u])\tvs\t(%-20s\t [%u, %u] - [%u, %u])\n",
// position.extent.row, position.extent.column,
// NAME(old_tree), old_start.extent.row, old_start.extent.column, old_end.extent.row, old_end.extent.column,
// NAME(new_tree), new_start.extent.row, new_start.extent.column, new_end.extent.row, new_end.extent.column);
if (point_lt(position, old_start_point)) {
if (point_lt(position, new_start_point)) {
next_position = point_min(old_start_point, new_start_point);
if (position.bytes < old_start.bytes) {
if (position.bytes < new_start.bytes) {
next_position = length_min(old_start, new_start);
} else {
is_changed = true;
next_position = old_start_point;
next_position = old_start;
}
} else if (point_lt(position, new_start_point)) {
} else if (position.bytes < new_start.bytes) {
is_changed = true;
next_position = new_start_point;
} else if (old_start_byte == new_start_byte &&
tree_must_eq(old_tree, new_tree)) {
next_position = old_end_point;
next_position = new_start;
} else if (old_start.bytes == new_start.bytes && tree_must_eq(old_tree, new_tree)) {
next_position = old_end;
} else if (old_tree->symbol == new_tree->symbol) {
if (tree_path_descend(old_path, position)) {
if (!tree_path_descend(new_path, position)) {
tree_path_ascend(old_path, 1);
is_changed = true;
next_position = new_end_point;
next_position = new_end;
}
} else if (tree_path_descend(new_path, position)) {
tree_path_ascend(new_path, 1);
is_changed = true;
next_position = old_end_point;
next_position = old_end;
} else {
next_position = point_min(old_end_point, new_end_point);
next_position = length_min(old_end, new_end);
}
} else {
is_changed = true;
next_position = point_min(old_end_point, new_end_point);
next_position = length_min(old_end, new_end);
}
bool at_old_end = point_lte(old_end_point, next_position);
bool at_new_end = point_lte(new_end_point, next_position);
bool at_old_end = old_end.bytes <= next_position.bytes;
bool at_new_end = new_end.bytes <= next_position.bytes;
if (at_new_end && at_old_end) {
uint32_t old_ascend_count = tree_path_advance(old_path);
@ -190,7 +206,7 @@ static void tree_path_get_changes(TreePath *old_path, TreePath *new_path,
tree_path_ascend(new_path, ascend_count);
}
if (is_changed) range_array_add(&results, position, next_position);
if (is_changed) range_array_add(&results, position.extent, next_position.extent);
position = next_position;
}