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DO NOT MERGE -- Tag strings #103766

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gvanrossum wants to merge 12 commits into from
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DO NOT MERGE -- Tag strings #103766

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1b61a5e
Tagged String syntax -- RAISES SYNTAX ERROR
gvanrossum May 1, 2022
a17f336
Some progress -- translate foo'bar' into foo('bar')
gvanrossum May 2, 2022
a9922f4
Correctly unparse TagString node
gvanrossum May 2, 2022
12ced2c
Accept only one string, make it a raw bytes
gvanrossum May 2, 2022
73f3c34
Parse the string as f-string
gvanrossum May 2, 2022
67175b0
Start calling tag(*args)
gvanrossum May 2, 2022
1c36df7
Pass lambdas (not quite thunks, but a step in the right direction)
gvanrossum May 2, 2022
d5a0e64
Lambdafy the expression only, exclusing conversion, spec
gvanrossum May 3, 2022
94c7335
Generate a (func, rawstr, conv, spec) tuple for thunks
gvanrossum May 3, 2022
399eaba
Restore original signature of _PyPegen_FstringParser_Init
gvanrossum May 3, 2022
c78e4a1
Fix unparsing of tagstring
gvanrossum May 4, 2022
1ec2fbe
Insist tag and str are flush together
gvanrossum May 4, 2022
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Pass lambdas (not quite thunks, but a step in the right direction)
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@gvanrossum
gvanrossum committed May 3, 2022
commit 1c36df7e8908b5fa075d55695c2275bfcc31a176
31 changes: 26 additions & 5 deletions Parser/action_helpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -869,26 +869,47 @@ _PyPegen_seq_delete_starred_exprs(Parser *p, asdl_seq *kwargs)
return new_seq;
}

static expr_ty
lambdafy(Parser *p, expr_ty arg)
{
assert(arg->kind == FormattedValue_kind);
arguments_ty args = _PyPegen_empty_arguments(p);
if (args == NULL)
return NULL;
return _PyAST_Lambda(args, arg,
arg->lineno, arg->col_offset, arg->end_lineno, arg->end_col_offset,
p->arena);
}

expr_ty
_PyPegen_tag_string(Parser *p, expr_ty tag, Token *tok)
{
// No prefixes (f, r, b, u)
// Parse like fstring
// Create a node similar to f-string AST
asdl_generic_seq *tokens = _Py_asdl_generic_seq_new(1, p->arena);
if (tokens == NULL)
return NULL;
asdl_seq_SET(tokens, 0, tok);
expr_ty str = _PyPegen_concatenate_strings(p, (asdl_seq *)tokens, 1);
if (str == NULL)
return NULL;
if (str->kind == JoinedStr_kind) {
// Transform FormattedValue items into thunks
asdl_expr_seq *values = str->v.JoinedStr.values;
int nvalues = asdl_seq_LEN(values);
for (int i = 0; i < nvalues; i++) {
expr_ty value = asdl_seq_GET(values, i);
if (value->kind == FormattedValue_kind) {
value = lambdafy(p, value);
if (value == NULL)
return NULL;
asdl_seq_SET(values, i, value);
}
}
}
return _PyAST_TagString(tag, str,
tag->lineno, tag->col_offset, str->end_lineno, str->end_col_offset,
p->arena);

}


expr_ty
_PyPegen_concatenate_strings(Parser *p, asdl_seq *strings, int tagged)
{
Expand Down