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states.c
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/* ------------------------------------------------------------------------- */
/* "states" : Statement translator */
/* */
/* Part of Inform 6.43 */
/* copyright (c) Graham Nelson 1993 - 2024 */
/* */
/* ------------------------------------------------------------------------- */
#include "header.h"
static int match_colon(void)
{ get_next_token();
if (token_type == SEP_TT)
{ if (token_value == SEMICOLON_SEP)
warning("Unlike C, Inform uses ':' to divide parts \
of a 'for' loop specification: replacing ';' with ':'");
else
if (token_value != COLON_SEP)
{ ebf_curtoken_error("':'");
panic_mode_error_recovery();
return(FALSE);
}
}
else
{ ebf_curtoken_error("':'");
panic_mode_error_recovery();
return(FALSE);
}
return(TRUE);
}
static void match_open_bracket(void)
{ get_next_token();
if ((token_type == SEP_TT) && (token_value == OPENB_SEP)) return;
put_token_back();
ebf_curtoken_error("'('");
}
extern void match_close_bracket(void)
{ get_next_token();
if ((token_type == SEP_TT) && (token_value == CLOSEB_SEP)) return;
put_token_back();
ebf_curtoken_error("')'");
}
static void parse_action(void)
{ int level = 1, args = 0, codegen_action;
assembly_operand AO, AO2, AO3, AO4, AO5;
/* An action statement has the form <ACTION NOUN SECOND, ACTOR>
or <<ACTION NOUN SECOND, ACTOR>>. It simply compiles into a call
to R_Process() with those four arguments. (The latter form,
with double brackets, means "return true afterwards".)
The R_Process() function should be supplied by the library,
although a stub is defined in the veneer.
The NOUN, SECOND, and ACTOR arguments are optional. If not
supplied, R_Process() will be called with fewer arguments.
(But if you supply ACTOR, it must be preceded by a comma.
<ACTION, ACTOR> is equivalent to <ACTION 0 0, ACTOR>.)
To complicate life, the ACTION argument may be a bare action
name or a parenthesized expression. (So <Take> is equivalent
to <(##Take)>.) We have to peek at the first token, checking
whether it's an open-paren, to distinguish these cases.
You may ask why the ACTOR argument is last; the "natural"
Inform ordering would be "<floyd, take ball>". True! Sadly,
Inform's lexer isn't smart enough to parse this consistently,
so we can't do it.
*/
dont_enter_into_symbol_table = TRUE;
get_next_token();
if ((token_type == SEP_TT) && (token_value == LESS_SEP))
{ level = 2; get_next_token();
}
dont_enter_into_symbol_table = FALSE;
/* Peek at the next token; see if it's an open-paren. */
if ((token_type==SEP_TT) && (token_value==OPENB_SEP))
{ put_token_back();
AO2 = parse_expression(ACTION_Q_CONTEXT);
codegen_action = TRUE;
}
else
{
if (token_type != UQ_TT) {
ebf_curtoken_error("name of action");
}
codegen_action = FALSE;
AO2 = action_of_name(token_text);
}
get_next_token();
AO3 = zero_operand;
AO4 = zero_operand;
AO5 = zero_operand;
if (!((token_type == SEP_TT) && (token_value == GREATER_SEP || token_value == COMMA_SEP)))
{ put_token_back();
args = 1;
AO3 = parse_expression(ACTION_Q_CONTEXT);
get_next_token();
}
if (!((token_type == SEP_TT) && (token_value == GREATER_SEP || token_value == COMMA_SEP)))
{ put_token_back();
args = 2;
AO4 = parse_expression(QUANTITY_CONTEXT);
get_next_token();
}
if (!((token_type == SEP_TT) && (token_value == GREATER_SEP || token_value == COMMA_SEP)))
{
ebf_curtoken_error("',' or '>'");
}
if ((token_type == SEP_TT) && (token_value == COMMA_SEP))
{
if (!glulx_mode && (version_number < 4))
{
error("<x, y> syntax is not available in Z-code V3 or earlier");
}
args = 3;
AO5 = parse_expression(QUANTITY_CONTEXT);
get_next_token();
if (!((token_type == SEP_TT) && (token_value == GREATER_SEP)))
{
ebf_curtoken_error("'>'");
}
}
if (level == 2)
{ get_next_token();
if (!((token_type == SEP_TT) && (token_value == GREATER_SEP)))
{ put_token_back();
ebf_curtoken_error("'>>'");
}
}
if (!glulx_mode) {
AO = veneer_routine(R_Process_VR);
switch(args)
{ case 0:
if (codegen_action) AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
if (version_number>=5)
assemblez_2(call_2n_zc, AO, AO2);
else
if (version_number==4)
assemblez_2_to(call_vs_zc, AO, AO2, temp_var1);
else
assemblez_2_to(call_zc, AO, AO2, temp_var1);
break;
case 1:
AO3 = code_generate(AO3, QUANTITY_CONTEXT, -1);
if (codegen_action) AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
if (version_number>=5)
assemblez_3(call_vn_zc, AO, AO2, AO3);
else
if (version_number==4)
assemblez_3_to(call_vs_zc, AO, AO2, AO3, temp_var1);
else
assemblez_3_to(call_zc, AO, AO2, AO3, temp_var1);
break;
case 2:
AO4 = code_generate(AO4, QUANTITY_CONTEXT, -1);
AO3 = code_generate(AO3, QUANTITY_CONTEXT, -1);
if (codegen_action) AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
if (version_number>=5)
assemblez_4(call_vn_zc, AO, AO2, AO3, AO4);
else
if (version_number==4)
assemblez_4_to(call_vs_zc, AO, AO2, AO3, AO4, temp_var1);
else
assemblez_4_to(call_zc, AO, AO2, AO3, AO4, temp_var1);
break;
case 3:
AO5 = code_generate(AO5, QUANTITY_CONTEXT, -1);
AO4 = code_generate(AO4, QUANTITY_CONTEXT, -1);
AO3 = code_generate(AO3, QUANTITY_CONTEXT, -1);
if (codegen_action) AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
if (version_number>=5)
assemblez_5(call_vn2_zc, AO, AO2, AO3, AO4, AO5);
else
if (version_number==4)
assemblez_5_to(call_vs2_zc, AO, AO2, AO3, AO4, AO5, temp_var1);
/* if V3 or earlier, we've already displayed an error */
break;
break;
}
if (level == 2) assemblez_0(rtrue_zc);
}
else {
AO = veneer_routine(R_Process_VR);
switch (args) {
case 0:
if (codegen_action)
AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
assembleg_call_1(AO, AO2, zero_operand);
break;
case 1:
AO3 = code_generate(AO3, QUANTITY_CONTEXT, -1);
if (codegen_action)
AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
assembleg_call_2(AO, AO2, AO3, zero_operand);
break;
case 2:
AO4 = code_generate(AO4, QUANTITY_CONTEXT, -1);
AO3 = code_generate(AO3, QUANTITY_CONTEXT, -1);
if (codegen_action)
AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
assembleg_call_3(AO, AO2, AO3, AO4, zero_operand);
break;
case 3:
AO5 = code_generate(AO5, QUANTITY_CONTEXT, -1);
if (!((AO5.type == LOCALVAR_OT) && (AO5.value == 0)))
assembleg_store(stack_pointer, AO5);
AO4 = code_generate(AO4, QUANTITY_CONTEXT, -1);
if (!((AO4.type == LOCALVAR_OT) && (AO4.value == 0)))
assembleg_store(stack_pointer, AO4);
AO3 = code_generate(AO3, QUANTITY_CONTEXT, -1);
if (!((AO3.type == LOCALVAR_OT) && (AO3.value == 0)))
assembleg_store(stack_pointer, AO3);
if (codegen_action)
AO2 = code_generate(AO2, QUANTITY_CONTEXT, -1);
if (!((AO2.type == LOCALVAR_OT) && (AO2.value == 0)))
assembleg_store(stack_pointer, AO2);
assembleg_3(call_gc, AO, four_operand, zero_operand);
break;
}
if (level == 2)
assembleg_1(return_gc, one_operand);
}
}
extern int parse_label(void)
{
get_next_token();
if ((token_type == SYMBOL_TT) &&
(symbols[token_value].type == LABEL_T))
{ symbols[token_value].flags |= USED_SFLAG;
return(symbols[token_value].value);
}
if ((token_type == SYMBOL_TT) && (symbols[token_value].flags & UNKNOWN_SFLAG))
{ assign_symbol(token_value, next_label, LABEL_T);
define_symbol_label(token_value);
next_label++;
symbols[token_value].flags |= CHANGE_SFLAG + USED_SFLAG;
return(symbols[token_value].value);
}
ebf_curtoken_error("label name");
return 0;
}
static void parse_print_z(int finally_return)
{ int count = 0; assembly_operand AO;
/* print <printlist> -------------------------------------------------- */
/* print_ret <printlist> ---------------------------------------------- */
/* <literal-string> --------------------------------------------------- */
/* */
/* <printlist> is a comma-separated list of items: */
/* */
/* <literal-string> */
/* <other-expression> */
/* (char) <expression> */
/* (address) <expression> */
/* (string) <expression> */
/* (a) <expression> */
/* (the) <expression> */
/* (The) <expression> */
/* (name) <expression> */
/* (number) <expression> */
/* (property) <expression> */
/* (<routine>) <expression> */
/* (object) <expression> (for use in low-level code only) */
/* --------------------------------------------------------------------- */
do
{ AI.text = token_text;
if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP)) break;
switch(token_type)
{ case DQ_TT:
if (token_text[0] == '^' && token_text[1] == '\0') {
/* The string "^" is always a simple newline. */
assemblez_0(new_line_zc);
break;
}
if ((int)strlen(token_text) > ZCODE_MAX_INLINE_STRING)
{ INITAOT(&AO, LONG_CONSTANT_OT);
AO.marker = STRING_MV;
AO.value = compile_string(token_text, STRCTX_GAME);
assemblez_1(print_paddr_zc, AO);
if (finally_return)
{ get_next_token();
if ((token_type == SEP_TT)
&& (token_value == SEMICOLON_SEP))
{ assemblez_0(new_line_zc);
assemblez_0(rtrue_zc);
return;
}
put_token_back();
}
break;
}
if (finally_return)
{ get_next_token();
if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP))
{ assemblez_0(print_ret_zc); return;
}
put_token_back();
}
assemblez_0(print_zc);
break;
case SEP_TT:
if (token_value == OPENB_SEP)
{ misc_keywords.enabled = TRUE;
get_next_token();
get_next_token();
if ((token_type == SEP_TT) && (token_value == CLOSEB_SEP))
{ assembly_operand AO1;
put_token_back(); put_token_back();
local_variables.enabled = FALSE;
get_next_token();
misc_keywords.enabled = FALSE;
local_variables.enabled = TRUE;
if ((token_type == STATEMENT_TT)
&&(token_value == STRING_CODE))
{ token_type = MISC_KEYWORD_TT;
token_value = STRING_MK;
}
switch(token_type)
{
case MISC_KEYWORD_TT:
switch(token_value)
{ case CHAR_MK:
if (runtime_error_checking_switch)
{ AO = veneer_routine(RT__ChPrintC_VR);
goto PrintByRoutine;
}
get_next_token();
AO1 = code_generate(
parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1);
assemblez_1(print_char_zc, AO1);
goto PrintTermDone;
case ADDRESS_MK:
if (runtime_error_checking_switch)
{ AO = veneer_routine(RT__ChPrintA_VR);
goto PrintByRoutine;
}
get_next_token();
AO1 = code_generate(
parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1);
assemblez_1(print_addr_zc, AO1);
goto PrintTermDone;
case STRING_MK:
if (runtime_error_checking_switch)
{ AO = veneer_routine(RT__ChPrintS_VR);
goto PrintByRoutine;
}
get_next_token();
AO1 = code_generate(
parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1);
assemblez_1(print_paddr_zc, AO1);
goto PrintTermDone;
case OBJECT_MK:
if (runtime_error_checking_switch)
{ AO = veneer_routine(RT__ChPrintO_VR);
goto PrintByRoutine;
}
get_next_token();
AO1 = code_generate(
parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1);
assemblez_1(print_obj_zc, AO1);
goto PrintTermDone;
case THE_MK:
AO = veneer_routine(DefArt_VR);
goto PrintByRoutine;
case AN_MK:
case A_MK:
AO = veneer_routine(InDefArt_VR);
goto PrintByRoutine;
case CAP_THE_MK:
AO = veneer_routine(CDefArt_VR);
goto PrintByRoutine;
case CAP_A_MK:
AO = veneer_routine(CInDefArt_VR);
goto PrintByRoutine;
case NAME_MK:
AO = veneer_routine(PrintShortName_VR);
goto PrintByRoutine;
case NUMBER_MK:
AO = veneer_routine(EnglishNumber_VR);
goto PrintByRoutine;
case PROPERTY_MK:
AO = veneer_routine(Print__Pname_VR);
goto PrintByRoutine;
default:
error_named("A reserved word was used as a print specification:",
token_text);
}
break;
case SYMBOL_TT:
if (symbols[token_value].flags & UNKNOWN_SFLAG)
{ INITAOT(&AO, LONG_CONSTANT_OT);
AO.value = token_value;
AO.marker = SYMBOL_MV;
AO.symindex = token_value;
}
else
{ INITAOT(&AO, LONG_CONSTANT_OT);
AO.value = symbols[token_value].value;
AO.marker = IROUTINE_MV;
AO.symindex = token_value;
if (symbols[token_value].type != ROUTINE_T)
ebf_curtoken_error("printing routine name");
}
symbols[token_value].flags |= USED_SFLAG;
PrintByRoutine:
get_next_token();
if (version_number >= 5)
assemblez_2(call_2n_zc, AO,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1));
else if (version_number == 4)
assemblez_2_to(call_vs_zc, AO,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1), temp_var1);
else
assemblez_2_to(call_zc, AO,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1), temp_var1);
goto PrintTermDone;
default: ebf_curtoken_error("print specification");
get_next_token();
assemblez_1(print_num_zc,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1));
goto PrintTermDone;
}
}
put_token_back(); put_token_back(); put_token_back();
misc_keywords.enabled = FALSE;
assemblez_1(print_num_zc,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1));
break;
}
/* Fall through */
default:
put_token_back(); misc_keywords.enabled = FALSE;
assemblez_1(print_num_zc,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1));
break;
}
PrintTermDone: misc_keywords.enabled = FALSE;
count++;
get_next_token();
if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP)) break;
if ((token_type != SEP_TT) || (token_value != COMMA_SEP))
{ ebf_curtoken_error("comma");
panic_mode_error_recovery(); return;
}
else get_next_token();
} while(TRUE);
if (count == 0) ebf_curtoken_error("something to print");
if (finally_return)
{ assemblez_0(new_line_zc);
assemblez_0(rtrue_zc);
}
}
static void parse_print_g(int finally_return)
{ int count = 0; assembly_operand AO, AO2;
/* print <printlist> -------------------------------------------------- */
/* print_ret <printlist> ---------------------------------------------- */
/* <literal-string> --------------------------------------------------- */
/* */
/* <printlist> is a comma-separated list of items: */
/* */
/* <literal-string> */
/* <other-expression> */
/* (char) <expression> */
/* (address) <expression> */
/* (string) <expression> */
/* (a) <expression> */
/* (A) <expression> */
/* (the) <expression> */
/* (The) <expression> */
/* (name) <expression> */
/* (number) <expression> */
/* (property) <expression> */
/* (<routine>) <expression> */
/* (object) <expression> (for use in low-level code only) */
/* --------------------------------------------------------------------- */
do
{
if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP)) break;
switch(token_type)
{ case DQ_TT:
if (token_text[0] == '^' && token_text[1] == '\0') {
/* The string "^" is always a simple newline. */
INITAOTV(&AO, BYTECONSTANT_OT, 0x0A);
assembleg_1(streamchar_gc, AO);
break;
}
/* We can't compile a string into the instruction,
so this always goes into the string area. */
{ INITAOT(&AO, CONSTANT_OT);
AO.marker = STRING_MV;
AO.value = compile_string(token_text, STRCTX_GAME);
assembleg_1(streamstr_gc, AO);
if (finally_return)
{ get_next_token();
if ((token_type == SEP_TT)
&& (token_value == SEMICOLON_SEP))
{ INITAOTV(&AO, BYTECONSTANT_OT, 0x0A);
assembleg_1(streamchar_gc, AO);
INITAOTV(&AO, BYTECONSTANT_OT, 1);
assembleg_1(return_gc, AO);
return;
}
put_token_back();
}
break;
}
break;
case SEP_TT:
if (token_value == OPENB_SEP)
{ misc_keywords.enabled = TRUE;
get_next_token();
get_next_token();
if ((token_type == SEP_TT) && (token_value == CLOSEB_SEP))
{ assembly_operand AO1;
put_token_back(); put_token_back();
local_variables.enabled = FALSE;
get_next_token();
misc_keywords.enabled = FALSE;
local_variables.enabled = TRUE;
if ((token_type == STATEMENT_TT)
&&(token_value == STRING_CODE))
{ token_type = MISC_KEYWORD_TT;
token_value = STRING_MK;
}
switch(token_type)
{
case MISC_KEYWORD_TT:
switch(token_value)
{ case CHAR_MK:
if (runtime_error_checking_switch)
{ AO = veneer_routine(RT__ChPrintC_VR);
goto PrintByRoutine;
}
get_next_token();
AO1 = code_generate(
parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1);
if (is_constant_ot(AO1.type) && AO1.marker == 0) {
if (AO1.value >= 0 && AO1.value < 0x100)
assembleg_1(streamchar_gc, AO1);
else
assembleg_1(streamunichar_gc, AO1);
}
else {
assembleg_1(streamunichar_gc, AO1);
}
goto PrintTermDone;
case ADDRESS_MK:
if (runtime_error_checking_switch)
AO = veneer_routine(RT__ChPrintA_VR);
else
AO = veneer_routine(Print__Addr_VR);
goto PrintByRoutine;
case STRING_MK:
if (runtime_error_checking_switch)
{ AO = veneer_routine(RT__ChPrintS_VR);
goto PrintByRoutine;
}
get_next_token();
AO1 = code_generate(
parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1);
assembleg_1(streamstr_gc, AO1);
goto PrintTermDone;
case OBJECT_MK:
if (runtime_error_checking_switch)
{ AO = veneer_routine(RT__ChPrintO_VR);
goto PrintByRoutine;
}
get_next_token();
AO1 = code_generate(
parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1);
INITAOT(&AO2, BYTECONSTANT_OT);
AO2.value = GOBJFIELD_NAME();
assembleg_3(aload_gc, AO1, AO2,
stack_pointer);
assembleg_1(streamstr_gc, stack_pointer);
goto PrintTermDone;
case THE_MK:
AO = veneer_routine(DefArt_VR);
goto PrintByRoutine;
case AN_MK:
case A_MK:
AO = veneer_routine(InDefArt_VR);
goto PrintByRoutine;
case CAP_THE_MK:
AO = veneer_routine(CDefArt_VR);
goto PrintByRoutine;
case CAP_A_MK:
AO = veneer_routine(CInDefArt_VR);
goto PrintByRoutine;
case NAME_MK:
AO = veneer_routine(PrintShortName_VR);
goto PrintByRoutine;
case NUMBER_MK:
AO = veneer_routine(EnglishNumber_VR);
goto PrintByRoutine;
case PROPERTY_MK:
AO = veneer_routine(Print__Pname_VR);
goto PrintByRoutine;
default:
error_named("A reserved word was used as a print specification:",
token_text);
}
break;
case SYMBOL_TT:
if (symbols[token_value].flags & UNKNOWN_SFLAG)
{ INITAOT(&AO, CONSTANT_OT);
AO.value = token_value;
AO.marker = SYMBOL_MV;
AO.symindex = token_value;
}
else
{ INITAOT(&AO, CONSTANT_OT);
AO.value = symbols[token_value].value;
AO.marker = IROUTINE_MV;
AO.symindex = token_value;
if (symbols[token_value].type != ROUTINE_T)
ebf_curtoken_error("printing routine name");
}
symbols[token_value].flags |= USED_SFLAG;
PrintByRoutine:
get_next_token();
INITAOT(&AO2, ZEROCONSTANT_OT);
assembleg_call_1(AO,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1),
AO2);
goto PrintTermDone;
default: ebf_curtoken_error("print specification");
get_next_token();
assembleg_1(streamnum_gc,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1));
goto PrintTermDone;
}
}
put_token_back(); put_token_back(); put_token_back();
misc_keywords.enabled = FALSE;
assembleg_1(streamnum_gc,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1));
break;
}
/* Fall through */
default:
put_token_back(); misc_keywords.enabled = FALSE;
assembleg_1(streamnum_gc,
code_generate(parse_expression(QUANTITY_CONTEXT),
QUANTITY_CONTEXT, -1));
break;
}
PrintTermDone: misc_keywords.enabled = FALSE;
count++;
get_next_token();
if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP)) break;
if ((token_type != SEP_TT) || (token_value != COMMA_SEP))
{ ebf_curtoken_error("comma");
panic_mode_error_recovery(); return;
}
else get_next_token();
} while(TRUE);
if (count == 0) ebf_curtoken_error("something to print");
if (finally_return)
{
INITAOTV(&AO, BYTECONSTANT_OT, 0x0A);
assembleg_1(streamchar_gc, AO);
INITAOTV(&AO, BYTECONSTANT_OT, 1);
assembleg_1(return_gc, AO);
}
}
/* Parse any number of ".Label;" lines before a statement.
Returns whether a statement can in fact follow. */
static int parse_named_label_statements()
{
while ((token_type == SEP_TT) && (token_value == PROPERTY_SEP))
{ /* That is, a full stop, signifying a label */
get_next_token();
if (token_type != SYMBOL_TT)
{
ebf_curtoken_error("label name");
return TRUE;
}
if (symbols[token_value].flags & UNKNOWN_SFLAG)
{ assign_symbol(token_value, next_label, LABEL_T);
symbols[token_value].flags |= USED_SFLAG;
assemble_label_no(next_label);
define_symbol_label(token_value);
next_label++;
}
else
{ if (symbols[token_value].type != LABEL_T) {
ebf_curtoken_error("label name");
return TRUE;
}
if (symbols[token_value].flags & CHANGE_SFLAG)
{ symbols[token_value].flags &= (~(CHANGE_SFLAG));
assemble_label_no(symbols[token_value].value);
define_symbol_label(token_value);
}
else error_named("Duplicate definition of label:", token_text);
}
get_next_token();
if ((token_type != SEP_TT) || (token_value != SEMICOLON_SEP))
{ ebf_curtoken_error("';'");
put_token_back(); return FALSE;
}
/* Interesting point of Inform grammar: a statement can only
consist solely of a label when it is immediately followed
by a "}". */
get_next_token();
if ((token_type == SEP_TT) && (token_value == CLOSE_BRACE_SEP))
{ put_token_back(); return FALSE;
}
/* The following line prevents labels from influencing the positions
of sequence points. */
statement_debug_location = get_token_location();
/* Another label might follow */
}
/* On with the statement */
return TRUE;
}
static void parse_statement_z(int break_label, int continue_label)
{ int ln, ln2, ln3, ln4, flag;
int pre_unreach, labelexists;
assembly_operand AO, AO2, AO3, AO4;
debug_location spare_debug_location1, spare_debug_location2;
ASSERT_ZCODE();
if ((token_type == SEP_TT) && (token_value == HASH_SEP))
{ parse_directive(TRUE);
parse_statement(break_label, continue_label); return;
}
if ((token_type == SEP_TT) && (token_value == AT_SEP))
{ parse_assembly(); return;
}
if ((token_type == SEP_TT) && (token_value == SEMICOLON_SEP)) return;
if (token_type == DQ_TT)
{ parse_print_z(TRUE); return;
}
if ((token_type == SEP_TT) && (token_value == LESS_SEP))
{ parse_action(); goto StatementTerminator; }
if (token_type == EOF_TT)
{ ebf_curtoken_error("statement"); return; }
/* If we don't see a keyword, this must be a function call or
other expression-with-side-effects. */
if (token_type != STATEMENT_TT)
{ put_token_back();
AO = parse_expression(VOID_CONTEXT);
code_generate(AO, VOID_CONTEXT, -1);
if (vivc_flag) { panic_mode_error_recovery(); return; }
goto StatementTerminator;
}
statements.enabled = FALSE;
switch(token_value)
{
/* -------------------------------------------------------------------- */
/* box <string-1> ... <string-n> -------------------------------------- */
/* -------------------------------------------------------------------- */
case BOX_CODE:
if (version_number == 3)
warning("The 'box' statement has no effect in a version 3 game");
INITAOT(&AO3, LONG_CONSTANT_OT);
AO3.value = begin_table_array();
AO3.marker = ARRAY_MV;
ln = 0; ln2 = 0;
do
{ get_next_token();
if ((token_type==SEP_TT)&&(token_value==SEMICOLON_SEP))
break;
if (token_type != DQ_TT)
ebf_curtoken_error("text of box line in double-quotes");
{ int i, j;
for (i=0, j=0; token_text[i] != 0; j++)
if (token_text[i] == '@')
{ if (token_text[i+1] == '@')
{ i = i + 2;
while (isdigit((uchar)token_text[i])) i++;
}
else
{ i++;
if (token_text[i] != 0) i++;
if (token_text[i] != 0) i++;
}
}
else i++;
if (j > ln2) ln2 = j;
}
put_token_back();
array_entry(ln++, FALSE, parse_expression(CONSTANT_CONTEXT));
} while (TRUE);
finish_array(ln, FALSE);
if (ln == 0)
error("No lines of text given for 'box' display");
if (version_number == 3) return;
INITAOTV(&AO2, SHORT_CONSTANT_OT, ln2);
INITAOTV(&AO4, VARIABLE_OT, globalv_z_temp_var1);
assemblez_3_to(call_vs_zc, veneer_routine(Box__Routine_VR),
AO2, AO3, AO4);
return;
/* -------------------------------------------------------------------- */
/* break -------------------------------------------------------------- */
/* -------------------------------------------------------------------- */
case BREAK_CODE:
if (break_label == -1)
error("'break' can only be used in a loop or 'switch' block");
else
assemblez_jump(break_label);
break;
/* -------------------------------------------------------------------- */
/* continue ----------------------------------------------------------- */
/* -------------------------------------------------------------------- */
case CONTINUE_CODE:
if (continue_label == -1)
error("'continue' can only be used in a loop block");
else
assemblez_jump(continue_label);
break;
/* -------------------------------------------------------------------- */
/* do <codeblock> until (<condition>) --------------------------------- */
/* -------------------------------------------------------------------- */
case DO_CODE:
assemble_label_no(ln = next_label++);
ln2 = next_label++; ln3 = next_label++;
parse_code_block(ln3, ln2, 0);
statements.enabled = TRUE;
get_next_token();
if ((token_type == STATEMENT_TT)
&& (token_value == UNTIL_CODE))
{ assemble_forward_label_no(ln2);
match_open_bracket();
AO = parse_expression(CONDITION_CONTEXT);
match_close_bracket();
code_generate(AO, CONDITION_CONTEXT, ln);
}
else error("'do' without matching 'until'");
assemble_forward_label_no(ln3);
break;
/* -------------------------------------------------------------------- */
/* font on/off -------------------------------------------------------- */
/* -------------------------------------------------------------------- */
case FONT_CODE:
misc_keywords.enabled = TRUE;
get_next_token();
misc_keywords.enabled = FALSE;
if ((token_type != MISC_KEYWORD_TT)
|| ((token_value != ON_MK)
&& (token_value != OFF_MK)))
{ ebf_curtoken_error("'on' or 'off'");
panic_mode_error_recovery();
break;
}
if (version_number >= 5)
{ /* Use the V5 @set_font opcode, setting font 4
(for font off) or 1 (for font on). */
INITAOT(&AO, SHORT_CONSTANT_OT);
if (token_value == ON_MK)
AO.value = 1;
else
AO.value = 4;
assemblez_1_to(set_font_zc, AO, temp_var1);
break;
}
/* Set the fixed-pitch header bit. */
INITAOTV(&AO, SHORT_CONSTANT_OT, 0);
INITAOTV(&AO2, SHORT_CONSTANT_OT, 8);
INITAOTV(&AO3, VARIABLE_OT, globalv_z_temp_var1);
assemblez_2_to(loadw_zc, AO, AO2, AO3);
if (token_value == ON_MK)
{ INITAOTV(&AO4, LONG_CONSTANT_OT, 0xfffd);
assemblez_2_to(and_zc, AO4, AO3, AO3);
}
else
{ INITAOTV(&AO4, SHORT_CONSTANT_OT, 2);
assemblez_2_to(or_zc, AO4, AO3, AO3);
}
assemblez_3(storew_zc, AO, AO2, AO3);
break;
/* -------------------------------------------------------------------- */
/* for (<initialisation> : <continue-condition> : <updating>) --------- */
/* -------------------------------------------------------------------- */
/* Note that it's legal for any or all of the three sections of a
'for' specification to be empty. This 'for' implementation
often wastes 3 bytes with a redundant branch rather than keep
expression parse trees for long periods (as previous versions
of Inform did, somewhat crudely by simply storing the textual
form of a 'for' loop). It is adequate for now. */
case FOR_CODE:
match_open_bracket();
get_next_token();
/* Initialisation code */
AO.type = OMITTED_OT;
spare_debug_location1 = statement_debug_location;
AO2.type = OMITTED_OT; flag = 0;
spare_debug_location2 = statement_debug_location;