296 lines
9 KiB
C
296 lines
9 KiB
C
#include <assert.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include "tree_sitter/parser.h"
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#include "runtime/tree.h"
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#include "runtime/length.h"
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TSTree *ts_tree_make_leaf(TSSymbol sym, TSLength padding, TSLength size,
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TSPoint padding_point,
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TSPoint size_point,
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TSNodeType node_type) {
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TSTree *result = malloc(sizeof(TSTree));
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*result = (TSTree){
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.ref_count = 1,
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.symbol = sym,
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.size = size,
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.child_count = 0,
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.visible_child_count = 0,
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.named_child_count = 0,
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.children = NULL,
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.padding = padding,
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.padding_point = padding_point,
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.size_point = size_point,
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.options = {.type = node_type },
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};
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if (sym == ts_builtin_sym_error) {
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result->options.fragile_left = true;
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result->options.fragile_right = true;
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}
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return result;
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}
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TSTree *ts_tree_make_error(TSLength size, TSLength padding,
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TSPoint start_point,
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TSPoint end_point,
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char lookahead_char) {
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TSTree *result =
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ts_tree_make_leaf(ts_builtin_sym_error, padding, size, start_point,
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end_point, TSNodeTypeNamed);
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result->lookahead_char = lookahead_char;
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return result;
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}
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static void ts_tree__set_children(TSTree *self, TSTree **children,
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size_t child_count) {
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self->children = children;
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self->child_count = child_count;
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self->visible_child_count = 0;
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for (size_t i = 0; i < child_count; i++) {
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TSTree *child = children[i];
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ts_tree_retain(child);
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child->context.parent = self;
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child->context.index = i;
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child->context.offset = ts_tree_total_size(self);
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child->context.end_point = ts_tree_end_point(self);
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if (i == 0) {
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self->padding = child->padding;
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self->size = child->size;
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} else {
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self->size =
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ts_length_add(ts_length_add(self->size, child->padding), child->size);
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}
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switch (child->options.type) {
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case TSNodeTypeNamed:
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self->visible_child_count++;
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self->named_child_count++;
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break;
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case TSNodeTypeAnonymous:
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self->visible_child_count++;
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break;
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case TSNodeTypeHidden:
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self->visible_child_count += child->visible_child_count;
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self->named_child_count += child->named_child_count;
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break;
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}
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}
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if (child_count > 0) {
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if (children[0]->options.fragile_left)
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self->options.fragile_left = true;
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if (children[child_count - 1]->options.fragile_right)
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self->options.fragile_right = true;
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}
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}
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TSTree *ts_tree_make_node(TSSymbol symbol, size_t child_count,
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TSTree **children, TSNodeType node_type) {
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TSTree *result =
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ts_tree_make_leaf(symbol, ts_length_zero(), ts_length_zero(), ts_point_zero(), ts_point_zero(), node_type);
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ts_tree__set_children(result, children, child_count);
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return result;
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}
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void ts_tree_retain(TSTree *self) {
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assert(self->ref_count > 0);
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self->ref_count++;
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}
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void ts_tree_release(TSTree *self) {
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assert(self->ref_count > 0);
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self->ref_count--;
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if (self->ref_count == 0) {
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for (size_t i = 0; i < self->child_count; i++)
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ts_tree_release(self->children[i]);
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if (self->child_count > 0)
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free(self->children);
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free(self);
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}
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}
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TSPoint ts_find_parent_offset_point(const TSTree *self) {
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TSPoint size_point = self->size_point;
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const TSTree *parent = self;
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TSPoint current_offset_point;
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do {
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parent = parent->context.parent;
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current_offset_point = parent->context.offset_point;
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} while (current_offset_point.line == 0);
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return (TSPoint){ .line = size_point.line, .column = current_offset_point.column };
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}
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TSLength ts_tree_total_size(const TSTree *self) {
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return ts_length_add(self->padding, self->size);
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}
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TSPoint ts_tree_total_size_point(const TSTree *self) {
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return ts_point_add(self->padding_point, self->size_point);
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}
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bool ts_tree_eq(const TSTree *self, const TSTree *other) {
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if (self) {
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if (!other)
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return false;
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} else {
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return !other;
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}
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if (self->symbol != other->symbol)
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return false;
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if (self->symbol == ts_builtin_sym_error)
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return self->lookahead_char == other->lookahead_char;
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if (self->child_count != other->child_count)
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return false;
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if (self->visible_child_count != other->visible_child_count)
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return false;
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if (self->named_child_count != other->named_child_count)
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return false;
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for (size_t i = 0; i < self->child_count; i++)
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if (!ts_tree_eq(self->children[i], other->children[i]))
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return false;
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return true;
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}
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static size_t write_lookahead_to_string(char *string, size_t limit,
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char lookahead) {
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switch (lookahead) {
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case '\0':
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return snprintf(string, limit, "<EOF>");
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default:
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return snprintf(string, limit, "'%c'", lookahead);
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}
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}
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static size_t ts_tree__write_to_string(const TSTree *self,
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const char **symbol_names, char *string,
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size_t limit, int is_root,
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bool include_anonymous) {
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if (!self)
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return snprintf(string, limit, "(NULL)");
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char *cursor = string;
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char **writer = (limit > 0) ? &cursor : &string;
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TSNodeType min_node_type =
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include_anonymous ? TSNodeTypeAnonymous : TSNodeTypeNamed;
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int visible = self->options.type >= min_node_type || is_root;
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if (visible && !is_root)
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cursor += snprintf(*writer, limit, " ");
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if (visible) {
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if (self->symbol == ts_builtin_sym_error && self->child_count == 0) {
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cursor += snprintf(*writer, limit, "(UNEXPECTED ");
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cursor += write_lookahead_to_string(*writer, limit, self->lookahead_char);
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} else {
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cursor += snprintf(*writer, limit, "(%s", symbol_names[self->symbol]);
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}
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}
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for (size_t i = 0; i < self->child_count; i++) {
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TSTree *child = self->children[i];
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cursor += ts_tree__write_to_string(child, symbol_names, *writer, limit, 0,
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include_anonymous);
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}
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if (visible)
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cursor += snprintf(*writer, limit, ")");
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return cursor - string;
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}
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char *ts_tree_string(const TSTree *self, const char **symbol_names,
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bool include_anonymous) {
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static char SCRATCH[1];
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size_t size = 1 + ts_tree__write_to_string(self, symbol_names, SCRATCH, 0, 1,
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include_anonymous);
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char *result = malloc(size * sizeof(char));
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ts_tree__write_to_string(self, symbol_names, result, size, 1,
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include_anonymous);
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return result;
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}
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void ts_tree_prepend_children(TSTree *self, size_t count, TSTree **children) {
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if (count == 0)
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return;
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size_t new_child_count = count + self->child_count;
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TSTree **new_children = realloc(children, new_child_count * sizeof(TSTree *));
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memcpy(new_children + count, self->children,
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self->child_count * sizeof(TSTree *));
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free(self->children);
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ts_tree__set_children(self, new_children, new_child_count);
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}
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static inline long min(long a, long b) {
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return a <= b ? a : b;
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}
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void ts_tree_edit(TSTree *self, TSInputEdit edit) {
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size_t start = edit.position;
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size_t new_end = edit.position + edit.chars_inserted;
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size_t old_end = edit.position + edit.chars_removed;
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assert(old_end <= ts_tree_total_size(self).chars);
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self->options.has_changes = true;
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if (start < self->padding.chars) {
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self->padding.bytes = 0;
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long remaining_padding = self->padding.chars - old_end;
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if (remaining_padding >= 0) {
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self->padding.chars = new_end + remaining_padding;
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} else {
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self->padding.chars = new_end;
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self->size.chars += remaining_padding;
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self->size.bytes = 0;
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}
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} else if (start == self->padding.chars && edit.chars_removed == 0) {
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self->padding.bytes = 0;
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self->padding.chars += edit.chars_inserted;
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} else {
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self->size.bytes = 0;
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self->size.chars += (edit.chars_inserted - edit.chars_removed);
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}
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bool found_first_child = false;
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long remainder_to_delete = edit.chars_removed - edit.chars_inserted;
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size_t child_left = 0, child_right = 0;
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for (size_t i = 0; i < self->child_count; i++) {
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TSTree *child = self->children[i];
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size_t child_size = ts_tree_total_size(child).chars;
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child_left = child_right;
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child_right += child_size;
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if (!found_first_child) {
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if (child_right >= start) {
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found_first_child = true;
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size_t chars_removed = min(edit.chars_removed, child_right - start);
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remainder_to_delete -= (chars_removed - edit.chars_inserted);
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ts_tree_edit(child, (TSInputEdit){
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.position = start - child_left,
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.chars_inserted = edit.chars_inserted,
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.chars_removed = chars_removed,
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});
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}
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} else {
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if (remainder_to_delete > 0) {
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size_t chars_removed = min(remainder_to_delete, child_size);
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remainder_to_delete -= chars_removed;
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ts_tree_edit(
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child,
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(TSInputEdit){
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.position = 0, .chars_inserted = 0, .chars_removed = chars_removed,
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});
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} else {
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break;
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}
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}
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}
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}
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