X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/9b8585410ae6c83b558aab76579bdf8506853662..53e2cd1ebd0a99048610004ccb7ba11d351981bc:/src/scan-code.l diff --git a/src/scan-code.l b/src/scan-code.l index 785f386d..fa593beb 100644 --- a/src/scan-code.l +++ b/src/scan-code.l @@ -46,6 +46,9 @@ YY_DECL; #define YY_USER_ACTION location_compute (loc, &loc->end, yytext, yyleng); +static char *fetch_type_name (char *cp, char const **type_name, + location dollar_loc); + static void handle_action_dollar (symbol_list *rule, char *cp, location dollar_loc); static void handle_action_at (symbol_list *rule, char *cp, location at_loc); @@ -95,11 +98,15 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" int braces_level = 0; /* Whether a semicolon is probably needed. - The heuristic is that a semicolon is not needed after '{', '}', ';', - or a C preprocessor directive, and that whitespaces and comments - do not affect this flag. - Note that '{' does not need a semicolon because of '{}'. - A semicolon may be needed before a cpp direcive, but don't bother. */ + + The heuristic is that a semicolon is not needed after '{', '}', + ';', or a C preprocessor directive, and that whitespaces and + comments do not affect this flag. Note that '{' does not need a + semicolon because of '{}'. A semicolon may be needed before a + cpp directive, but don't bother. + + While it is maintained in several start-conditions (factoring + opportunities), it is meaningful only for SC_RULE_ACTION. */ bool need_semicolon = false; /* Whether in a C preprocessor directive. Don't use a start condition @@ -157,7 +164,8 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" } -{ + +{ "'" { STRING_GROW; BEGIN SC_CHARACTER; @@ -176,6 +184,15 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" STRING_GROW; BEGIN SC_LINE_COMMENT; } + [$@] { + warn_at (*loc, _("stray '%s'"), yytext); + obstack_escape (&obstack_for_string, yytext); + need_semicolon = true; + } + [\[\]] { + obstack_escape (&obstack_for_string, yytext); + need_semicolon = true; + } } @@ -194,24 +211,6 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" obstack_sgrow (&obstack_for_string, ref_tail_fields); need_semicolon = true; } - "$" { - warn_at (*loc, _("stray '$'")); - obstack_sgrow (&obstack_for_string, "$]["); - need_semicolon = true; - } - "@" { - warn_at (*loc, _("stray '@'")); - obstack_sgrow (&obstack_for_string, "@@"); - need_semicolon = true; - } - "[" { - obstack_sgrow (&obstack_for_string, "@{"); - need_semicolon = true; - } - "]" { - obstack_sgrow (&obstack_for_string, "@}"); - need_semicolon = true; - } ";" STRING_GROW; need_semicolon = false; "{" STRING_GROW; ++braces_level; need_semicolon = false; @@ -261,8 +260,12 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" { - "$$" { - obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar["); + "$"("<"{tag}">")?"$" { + const char *type_name = NULL; + fetch_type_name (yytext + 1, &type_name, *loc)[-1] = 0; + obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar("); + obstack_quote (&obstack_for_string, type_name); + obstack_sgrow (&obstack_for_string, ")["); self->is_value_used = true; } "@$" { @@ -272,29 +275,17 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" } - /*-----------------------------------------. - | Escape M4 quoting characters in C code. | - `-----------------------------------------*/ - <*> { - \$ obstack_sgrow (&obstack_for_string, "$]["); - \@ obstack_sgrow (&obstack_for_string, "@@"); - \[ obstack_sgrow (&obstack_for_string, "@{"); - \] obstack_sgrow (&obstack_for_string, "@}"); -} + /* Escape M4 quoting characters in C code. */ + [$@\[\]] obstack_escape (&obstack_for_string, yytext); - /*-----------------------------------------------------. - | By default, grow the string obstack with the input. | - `-----------------------------------------------------*/ + /* By default, grow the string obstack with the input. */ + .|\n STRING_GROW; -<*>.|\n STRING_GROW; - - /* End of processing. */ -<*><> { - STRING_FINISH; - return last_string; - } + /* End of processing. */ + <> STRING_FINISH; return last_string; +} %% @@ -452,30 +443,30 @@ show_sub_messages (const char* cp, bool explicit_bracketing, /* Create the explanation message. */ obstack_init (&msg_buf); - obstack_fgrow1 (&msg_buf, _("possibly meant: %c"), dollar_or_at); + obstack_printf (&msg_buf, _("possibly meant: %c"), dollar_or_at); if (contains_dot_or_dash (id)) - obstack_fgrow1 (&msg_buf, "[%s]", id); + obstack_printf (&msg_buf, "[%s]", id); else obstack_sgrow (&msg_buf, id); obstack_sgrow (&msg_buf, tail); if (var->err & VARIANT_HIDDEN) { - obstack_fgrow1 (&msg_buf, _(", hiding %c"), dollar_or_at); + obstack_printf (&msg_buf, _(", hiding %c"), dollar_or_at); if (contains_dot_or_dash (var->id)) - obstack_fgrow1 (&msg_buf, "[%s]", var->id); + obstack_printf (&msg_buf, "[%s]", var->id); else obstack_sgrow (&msg_buf, var->id); obstack_sgrow (&msg_buf, tail); } - obstack_fgrow1 (&msg_buf, _(" at %s"), at_spec); + obstack_printf (&msg_buf, _(" at %s"), at_spec); if (var->err & VARIANT_NOT_VISIBLE_FROM_MIDRULE) { const char *format = _(", cannot be accessed from mid-rule action at $%d"); - obstack_fgrow1 (&msg_buf, format, midrule_rhs_index); + obstack_printf (&msg_buf, format, midrule_rhs_index); } obstack_1grow (&msg_buf, '\0'); @@ -686,6 +677,31 @@ parse_ref (char *cp, symbol_list *rule, int rule_length, int max_left_semantic_context = 0; +/* If CP points to a typename (i.e., <.*?>), set TYPE_NAME to its + beginning (i.e., after the opening "<", and return the pointer + immediately after it. */ + +static +char * +fetch_type_name (char *cp, char const **type_name, + location dollar_loc) +{ + if (*cp == '<') + { + *type_name = ++cp; + while (*cp != '>') + ++cp; + + /* The '>' symbol will be later replaced by '\0'. Original + 'text' is needed for error messages. */ + ++cp; + if (untyped_var_seen) + complain_at (dollar_loc, _("explicit type given in untyped grammar")); + tag_seen = true; + } + return cp; +} + /*------------------------------------------------------------------. | TEXT is pointing to a wannabee semantic value (i.e., a '$'). | | | @@ -699,7 +715,6 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) { char const *type_name = NULL; char *cp = text + 1; - char *gt_ptr = 0; symbol_list *effective_rule; int effective_rule_length; int n; @@ -716,26 +731,14 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) } /* Get the type name if explicit. */ - if (*cp == '<') - { - type_name = ++cp; - while (*cp != '>') - ++cp; - - /* The '>' symbol will be later replaced by '\0'. Original - 'text' is needed for error messages. */ - gt_ptr = cp; - ++cp; - if (untyped_var_seen) - complain_at (dollar_loc, _("explicit type given in untyped grammar")); - tag_seen = true; - } + cp = fetch_type_name (cp, &type_name, dollar_loc); n = parse_ref (cp, effective_rule, effective_rule_length, rule->midrule_parent_rhs_index, text, dollar_loc, '$'); - if (gt_ptr) - *gt_ptr = '\0'; + /* End type_name. */ + if (type_name) + cp[-1] = '\0'; switch (n) { @@ -762,11 +765,11 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) } else untyped_var_seen = true; - type_name = ""; } - obstack_fgrow1 (&obstack_for_string, - "]b4_lhs_value([%s])[", type_name); + obstack_sgrow (&obstack_for_string, "]b4_lhs_value("); + obstack_quote (&obstack_for_string, type_name); + obstack_sgrow (&obstack_for_string, ")["); rule->action_props.is_value_used = true; break; @@ -783,12 +786,12 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) cp, quote (effective_rule->content.sym->tag)); else untyped_var_seen = true; - type_name = ""; } - obstack_fgrow3 (&obstack_for_string, - "]b4_rhs_value(%d, %d, [%s])[", - effective_rule_length, n, type_name); + obstack_printf (&obstack_for_string, + "]b4_rhs_value(%d, %d, ", effective_rule_length, n); + obstack_quote (&obstack_for_string, type_name); + obstack_sgrow (&obstack_for_string, ")["); if (n > 0) symbol_list_n_get (effective_rule, n)->action_props.is_value_used = true; @@ -835,7 +838,7 @@ handle_action_at (symbol_list *rule, char *text, location at_loc) break; default: - obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[", + obstack_printf (&obstack_for_string, "]b4_rhs_location(%d, %d)[", effective_rule_length, n); break; }