static int grammar_line(int verbnum, int line) { /* Parse a grammar line, to be written into grammar_lines[mark] onward. Syntax: * <token1> ... <token-n> -> <action> is compiled to a table in the form: <action number : word> <token 1> ... <token n> <ENDIT> where <ENDIT> is the byte 15, and each <token> is 3 bytes long. If grammar_version_number is 1, the token holds <bytecode> 00 00 and otherwise a GV2 token. Return TRUE if grammar continues after the line, FALSE if the directive comes to an end. */ int j, bytecode, mark; int32 wordcode; int grammar_token, slash_mode, last_was_slash; int reverse_action, TOKEN_SIZE; debug_location_beginning beginning_debug_location = get_token_location_beginning(); get_next_token(); if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP)) { discard_token_location(beginning_debug_location); return FALSE; } if (!((token_type == SEP_TT) && (token_value == TIMES_SEP))) { discard_token_location(beginning_debug_location); ebf_error("'*' divider", token_text); panic_mode_error_recovery(); return FALSE; } /* Have we run out of lines or token space? */ if (line >= MAX_LINES_PER_VERB) { discard_token_location(beginning_debug_location); error("Too many lines of grammar for verb. This maximum is built \ into Inform, so suggest rewriting grammar using general parsing routines"); return(FALSE); }
extern void make_fake_action(void) { int i; char action_sub[MAX_IDENTIFIER_LENGTH+4]; debug_location_beginning beginning_debug_location = get_token_location_beginning(); get_next_token(); if (token_type != SYMBOL_TT) { discard_token_location(beginning_debug_location); ebf_error("new fake action name", token_text); panic_mode_error_recovery(); return; } sprintf(action_sub, "%s__A", token_text); i = symbol_index(action_sub, -1); if (!(sflags[i] & UNKNOWN_SFLAG)) { discard_token_location(beginning_debug_location); ebf_error("new fake action name", token_text); panic_mode_error_recovery(); return; } assign_symbol(i, ((grammar_version_number==1)?256:4096)+no_fake_actions++, FAKE_ACTION_T); new_action(token_text, i); if (debugfile_switch) { debug_file_printf("<fake-action>"); debug_file_printf("<identifier>##%s</identifier>", token_text); debug_file_printf("<value>%d</value>", svals[i]); get_next_token(); write_debug_locations (get_token_location_end(beginning_debug_location)); put_token_back(); debug_file_printf("</fake-action>"); } return; }
extern int32 parse_routine(char *source, int embedded_flag, char *name, int veneer_flag, int r_symbol) { int32 packed_address; int i; int debug_flag = FALSE; int switch_clause_made = FALSE, default_clause_made = FALSE, switch_label = 0; debug_location_beginning beginning_debug_location = get_token_location_beginning(); /* (switch_label needs no initialisation here, but it prevents some compilers from issuing warnings) */ if ((source != lexical_source) || (veneer_flag)) { lexical_source = source; restart_lexer(lexical_source, name); } no_locals = 0; for (i=0; i<MAX_LOCAL_VARIABLES-1; i++) local_variables.keywords[i] = ""; do { statements.enabled = TRUE; dont_enter_into_symbol_table = TRUE; get_next_token(); dont_enter_into_symbol_table = FALSE; if ((token_type == SEP_TT) && (token_value == TIMES_SEP) && (no_locals == 0) && (!debug_flag)) { debug_flag = TRUE; continue; } if (token_type != DQ_TT) { if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP)) break; ebf_error("local variable name or ';'", token_text); panic_mode_error_recovery(); break; } if (strlen(token_text) > MAX_IDENTIFIER_LENGTH) { error_named("Local variable identifier too long:", token_text); panic_mode_error_recovery(); break; } if (no_locals == MAX_LOCAL_VARIABLES-1) { error_numbered("Too many local variables for a routine; max is", MAX_LOCAL_VARIABLES-1); panic_mode_error_recovery(); break; } for (i=0; i<no_locals; i++) if (strcmpcis(token_text, local_variables.keywords[i])==0) error_named("Local variable defined twice:", token_text); local_variables.keywords[no_locals++] = token_text; } while(TRUE); construct_local_variable_tables(); if ((trace_fns_setting==3) || ((trace_fns_setting==2) && (veneer_mode==FALSE)) || ((trace_fns_setting==1) && (is_systemfile()==FALSE))) debug_flag = TRUE; if ((embedded_flag == FALSE) && (veneer_mode == FALSE) && debug_flag) sflags[r_symbol] |= STAR_SFLAG; packed_address = assemble_routine_header(no_locals, debug_flag, name, embedded_flag, r_symbol); do { begin_syntax_line(TRUE); get_next_token(); if (token_type == EOF_TT) { ebf_error("']'", token_text); assemble_routine_end (embedded_flag, get_token_location_end(beginning_debug_location)); put_token_back(); break; } if ((token_type == SEP_TT) && (token_value == CLOSE_SQUARE_SEP)) { if (switch_clause_made && (!default_clause_made)) assemble_label_no(switch_label); directives.enabled = TRUE; sequence_point_follows = TRUE; get_next_token(); assemble_routine_end (embedded_flag, get_token_location_end(beginning_debug_location)); put_token_back(); break; } if ((token_type == STATEMENT_TT) && (token_value == SDEFAULT_CODE)) { if (default_clause_made) error("Multiple 'default' clauses defined in same 'switch'"); default_clause_made = TRUE; if (switch_clause_made) { if (!execution_never_reaches_here) { sequence_point_follows = FALSE; if (!glulx_mode) assemblez_0((embedded_flag)?rfalse_zc:rtrue_zc); else assembleg_1(return_gc, ((embedded_flag)?zero_operand:one_operand)); } assemble_label_no(switch_label); } switch_clause_made = TRUE; get_next_token(); if ((token_type == SEP_TT) && (token_value == COLON_SEP)) continue; ebf_error("':' after 'default'", token_text); panic_mode_error_recovery(); continue; } /* Only check for the form of a case switch if the initial token isn't double-quoted text, as that would mean it was a print_ret statement: this is a mild ambiguity in the grammar. Action statements also cannot be cases. */ if ((token_type != DQ_TT) && (token_type != SEP_TT)) { get_next_token(); if (switch_sign() > 0) { assembly_operand AO; if (default_clause_made) error("'default' must be the last 'switch' case"); if (switch_clause_made) { if (!execution_never_reaches_here) { sequence_point_follows = FALSE; if (!glulx_mode) assemblez_0((embedded_flag)?rfalse_zc:rtrue_zc); else assembleg_1(return_gc, ((embedded_flag)?zero_operand:one_operand)); } assemble_label_no(switch_label); } switch_label = next_label++; switch_clause_made = TRUE; put_token_back(); put_token_back(); if (!glulx_mode) { INITAOTV(&AO, VARIABLE_OT, 249); } else { INITAOTV(&AO, GLOBALVAR_OT, MAX_LOCAL_VARIABLES+6); /* sw__var */ } parse_switch_spec(AO, switch_label, TRUE); continue; } else { put_token_back(); put_token_back(); get_next_token(); sequence_point_follows = TRUE; } } parse_statement(-1, -1); } while (TRUE); return packed_address; }