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detect broken comments in the lexer

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This commit is contained in:
Allen Webster
2021-06-30 15:39:03 -04:00
parent ac462ca85c
commit 174e995e00
2 changed files with 15 additions and 55 deletions
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docs/metadesk_reference.md
+1 -5
View File
@@ -377,13 +377,9 @@ main:
RegularMax,
Comment,
WhitespaceMin,
Whitespace,
Newline,
WhitespaceMax,
MD_TokenKind_BadCharacter,
BadCharacter,
MAX,
};
source/md_impl.c
+14 -50
View File
@@ -1081,19 +1081,6 @@ _MD_TokenBoundariesAreBalanced(MD_Token token)
return result;
}
// TODO(allen): wouldn't the lexer have already figured this out? Why not just make
// it a flag or a kind on the token?
MD_PRIVATE_FUNCTION_IMPL MD_b32
_MD_CommentIsSyntacticallyCorrect(MD_Token comment_token)
{
MD_String8 inner = comment_token.string;
MD_String8 outer = comment_token.outer_string;
MD_b32 incorrect = (MD_StringMatch(MD_StringPrefix(outer, 2), MD_S8Lit("/*"), 0) && // C-style comment
(inner.str != outer.str + 2 || inner.str + inner.size != outer.str + outer.size - 2)); // Internally unbalanced
MD_b32 result = !incorrect;
return result;
}
MD_FUNCTION MD_Token
MD_TokenFromString(MD_String8 string)
{
@@ -1157,16 +1144,8 @@ MD_TokenFromString(MD_String8 string)
}
else if (at[1] == '*')
{
// TODO(allen): proposal:
// 1. only set `kind = Comment` in the `counter == 0` case
// 2. otherwise set `kind = RunOnComment` (or something)
// maybe also emit an error *from here* or signal to a system that
// runs later that there are token errors to emit.
// Or: keep the `kind = Comment` but in the `counter != 0` case
// set some kind of error/unclosed/run-on flag on the token.
at += 2;
token.kind = MD_TokenKind_Comment;
token.kind = MD_TokenKind_BrokenComment;
skip_n = 2;
int counter = 1;
for (;at < one_past_last && counter > 0; at += 1)
@@ -1187,8 +1166,13 @@ MD_TokenFromString(MD_String8 string)
}
if(counter == 0)
{
token.kind = MD_TokenKind_Comment;
chop_n = 2;
}
else
{
// TODO(allen): emit an error *from here*
}
}
}
if (token.kind == 0) goto symbol_lex;
@@ -1535,7 +1519,7 @@ MD_ParseNodeSet(MD_String8 string, MD_u64 offset, MD_Node *parent, MD_ParseSetRu
//- rjf: check separators and possible braces from higher parents
{
closer_check_off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Comment|MD_TokenGroup_Whitespace);
closer_check_off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Irregular);
MD_Token potential_closer = MD_TokenFromString(MD_StringSkip(string, closer_check_off));
if(potential_closer.kind == MD_TokenKind_Symbol &&
(MD_StringMatch(potential_closer.outer_string, MD_S8Lit(","), 0) ||
@@ -1560,7 +1544,7 @@ MD_ParseNodeSet(MD_String8 string, MD_u64 offset, MD_Node *parent, MD_ParseSetRu
if(!close_with_separator && !parse_all)
{
MD_u64 closer_check_off = off;
closer_check_off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Comment|MD_TokenGroup_Whitespace);
closer_check_off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Irregular);
MD_Token potential_closer = MD_TokenFromString(MD_StringSkip(string, closer_check_off));
if(potential_closer.kind == MD_TokenKind_Symbol)
{
@@ -1607,7 +1591,7 @@ MD_ParseNodeSet(MD_String8 string, MD_u64 offset, MD_Node *parent, MD_ParseSetRu
MD_NodeFlags trailing_separator_flags = 0;
if(!close_with_separator)
{
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Comment|MD_TokenGroup_Whitespace);
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Irregular);
MD_Token trailing_separator = MD_TokenFromString(MD_StringSkip(string, off));
if(MD_StringMatch(trailing_separator.string, MD_S8Lit(","), 0) &&
trailing_separator.kind == MD_TokenKind_Symbol)
@@ -1665,7 +1649,7 @@ MD_ParseTagList(MD_String8 string, MD_u64 offset)
for(;off < string.size;)
{
//- rjf: parse @ symbol, signifying start of tag
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Comment|MD_TokenGroup_Whitespace);
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Irregular);
MD_Token next_token = MD_TokenFromString(MD_StringSkip(string, off));
if(!MD_StringMatch(next_token.string, MD_S8Lit("@"), 0) ||
next_token.kind != MD_TokenKind_Symbol)
@@ -1752,16 +1736,6 @@ MD_ParseOneNode(MD_String8 string, MD_u64 offset)
break;
}
comment_before = comment_token.string;
// TODO(allen): I find this odd. Wouldn't it have been easier to generate this
// durring or right after the lexing phase?
if(!_MD_CommentIsSyntacticallyCorrect(comment_token))
{
MD_String8 capped = MD_StringPrefix(comment_token.outer_string, MD_UNTERMINATED_TOKEN_LEN_CAP);
MD_Error *error = MD_MakeTokenError(string, comment_token, MD_MessageKind_CatastrophicError,
MD_PushStringF("Unterminated comment \"%.*s\"", MD_StringExpand(capped)));
MD_PushErrorToList(&result.errors, error);
}
}
}
@@ -1776,7 +1750,7 @@ MD_ParseOneNode(MD_String8 string, MD_u64 offset)
retry:;
{
//- rjf: try to parse an unnamed set
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Comment|MD_TokenGroup_Whitespace);
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Irregular);
MD_Token unnamed_set_opener = MD_TokenFromString(MD_StringSkip(string, off));
if(unnamed_set_opener.kind == MD_TokenKind_Symbol &&
(MD_StringMatch(unnamed_set_opener.string, MD_S8Lit("("), 0) ||
@@ -1792,7 +1766,7 @@ MD_ParseOneNode(MD_String8 string, MD_u64 offset)
}
//- rjf: try to parse regular node, with/without children
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Comment|MD_TokenGroup_Whitespace);
off += MD_LexAdvanceFromSkips(MD_StringSkip(string, off), MD_TokenGroup_Irregular);
MD_Token label_name = MD_TokenFromString(MD_StringSkip(string, off));
if((label_name.kind & MD_TokenGroup_Label) != 0)
{
@@ -1831,7 +1805,7 @@ MD_ParseOneNode(MD_String8 string, MD_u64 offset)
//- rjf: try to parse children for this node
MD_u64 colon_check_off = off;
colon_check_off += MD_LexAdvanceFromSkips(MD_StringSkip(string, colon_check_off), MD_TokenGroup_Comment|MD_TokenGroup_Whitespace);
colon_check_off += MD_LexAdvanceFromSkips(MD_StringSkip(string, colon_check_off), MD_TokenGroup_Irregular);
MD_Token colon = MD_TokenFromString(MD_StringSkip(string, colon_check_off));
if(MD_StringMatch(colon.string, MD_S8Lit(":"), 0) && colon.kind == MD_TokenKind_Symbol)
{
@@ -1876,7 +1850,7 @@ MD_ParseOneNode(MD_String8 string, MD_u64 offset)
//- rjf: collect bad token
MD_Token bad_token = MD_TokenFromString(MD_StringSkip(string, off));
if(bad_token.kind == MD_TokenKind_BadCharacter)
if(bad_token.kind & MD_TokenGroup_Error)
{
off += bad_token.outer_string.size;
@@ -1925,16 +1899,6 @@ MD_ParseOneNode(MD_String8 string, MD_u64 offset)
}
}
comment_after = comment_token.string;
// TODO(allen): I find this odd. Wouldn't it have been easier to generate this
// durring or right after the lexing phase?
if(!_MD_CommentIsSyntacticallyCorrect(comment_token))
{
MD_String8 capped = MD_StringPrefix(comment_token.outer_string, MD_UNTERMINATED_TOKEN_LEN_CAP);
MD_Error *error = MD_MakeTokenError(string, comment_token, MD_MessageKind_CatastrophicError,
MD_PushStringF("Unterminated comment \"%.*s\"", MD_StringExpand(capped)));
MD_PushErrorToList(&result.errors, error);
}
}
//- rjf: fill result