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Support in parse_dump_tree for "forests", which occur when there's a

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parse error
This commit is contained in:
ridiculousfish 2014-01-03 16:54:34 -08:00
parent b8079953d8
commit c8eec109b2
2 changed files with 21 additions and 6 deletions
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24
parse_tree.cpp
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@ -339,9 +339,17 @@ static inline parse_token_type_t parse_token_type_from_tokenizer_token(enum toke
}
/* Helper function for dump_tree */
static void dump_tree_recursive(const parse_node_tree_t &nodes, const wcstring &src, node_offset_t node_idx, size_t indent, wcstring *result, size_t *line)
static void dump_tree_recursive(const parse_node_tree_t &nodes, const wcstring &src, node_offset_t node_idx, size_t indent, wcstring *result, size_t *line, node_offset_t *inout_first_node_not_dumped)
{
assert(node_idx < nodes.size());
// Update first_node_not_dumped
// This takes a bit of explanation. While it's true that a parse tree may be a "forest", its individual trees are "compact," meaning they are not interleaved. Thus we keep track of the largest node index as we descend a tree. One past the largest is the start of the next tree.
if (*inout_first_node_not_dumped <= node_idx)
{
*inout_first_node_not_dumped = node_idx + 1;
}
const parse_node_t &node = nodes.at(node_idx);
const size_t spacesPerIndent = 2;
@ -383,19 +391,27 @@ static void dump_tree_recursive(const parse_node_tree_t &nodes, const wcstring &
++*line;
for (size_t child_idx = node.child_start; child_idx < node.child_start + node.child_count; child_idx++)
{
dump_tree_recursive(nodes, src, child_idx, indent + 1, result, line);
dump_tree_recursive(nodes, src, child_idx, indent + 1, result, line, inout_first_node_not_dumped);
}
}
/* Gives a debugging textual description of a parse tree */
/* Gives a debugging textual description of a parse tree. Note that this supports "parse forests" too. That is, our tree may not really be a tree, but instead a collection of trees. */
wcstring parse_dump_tree(const parse_node_tree_t &nodes, const wcstring &src)
{
if (nodes.empty())
return L"(empty!)";
node_offset_t first_node_not_dumped = 0;
size_t line = 0;
wcstring result;
dump_tree_recursive(nodes, src, 0, 0, &result, &line);
while (first_node_not_dumped < nodes.size())
{
if (first_node_not_dumped > 0)
{
result.append(L"---New Tree---\n");
}
dump_tree_recursive(nodes, src, first_node_not_dumped, 0, &result, &line, &first_node_not_dumped);
}
return result;
}

1
parse_tree.h
View file

@ -272,7 +272,6 @@ public:
argument_list = <empty> | argument argument_list
arguments_or_redirections_list = <empty> |
argument_or_redirection arguments_or_redirections_list
argument_or_redirection = argument | redirection