DeCarabas/lrparsers
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

[runtime] When all else fails ask the author

Browse source 
Better error messages by allowing the author to customize the string.
(This kinda works actually.)
This commit is contained in:
John Doty 2024-10-28 06:24:47 -07:00
parent c44083b610
commit 13f1353134
2 changed files with 48 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

10
parser/runtime.py
View file

@ -404,6 +404,9 @@ class Parser:
def __init__(self, table: parser.ParseTable):
self.table = table
def readable(self, token_kind: str) -> str:
return self.table.error_names.get(token_kind, token_kind)
def parse(self, tokens: TokenStream) -> typing.Tuple[Tree | None, list[str]]:
"""Parse a token stream into a tree, returning both the root of the tree
(if any could be found) and a list of errors that were encountered during
@ -527,7 +530,8 @@ class Parser:
# See if we can figure out what we were working on here,
# for the error message.
if production_message is None and len(repair.reductions) > 0:
production_message = f"while parsing {repair.reductions[-1]}"
reduction = repair.reductions[-1]
production_message = f"while parsing {self.readable(reduction)}"
match repair.repair:
case RepairAction.Base:
@ -553,7 +557,9 @@ class Parser:
cursor += 1
if token_message is None:
token_message = f"(Did you forget {repair.value}?)"
token_message = (
f"(Did you forget {self.readable(repair.value)}?)"
)
case RepairAction.Delete:
del input[cursor]