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parser.c
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parser.c
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#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include "lib/token.h"
#include "lib/fatarena.h"
#include "parser.h"
#define LOCALSZ 64
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define TODO(message) \
do { \
fprintf(stderr, "TODO(%d): %s\n", __LINE__, message); \
} while (0)
#define ERR(...) fprintf(stderr, "ERR(%d,%d): ", __LINE__, line); fprintf(stderr, __VA_ARGS__), fprintf(stderr, "\n")
#define BURNSEPARATORS(_t, _i) \
do { \
while (1) { \
if (_t[_i] == NEWLINE) { \
line++; \
_i++; \
} else if (_t[_i] == SEMICOLON) { \
_i++; \
} \
else { \
break; \
} \
} \
} while (0)
#define BURNNEWLINE(_t, _i) \
do { \
while (_t[_i] == NEWLINE) { \
_i++; \
line++; \
} \
} while (0)
#define ISTOK(_t, _eoe, _res) \
do { \
int _i = 0; \
_res = 0; \
while (_eoe[_i] != UNDEFINED) { \
if ((_t) == _eoe[_i]) { \
_res = 1; \
break; \
} \
_i++; \
} \
} while (0)
#define SAVECST(_dest, _kind, _addr) \
do { \
intptr _tmp = ftalloc(&ftast, sizeof(Csti)); \
*_dest = _tmp; \
Csti *_csti = (Csti *)ftptr(&ftast, _tmp); \
_csti->addr = _addr; \
_csti->kind = _kind; \
} while (0)
#define PTRLVL(_t, _i, _type, _ptrlvl) \
do { \
if (_t[_i] == BXOR) { \
while (_t[_i] == BXOR) { \
_ptrlvl++; \
_i++; \
} \
if (_t[_i] != IDENTIFIER) { \
ERR("Error when parsing a type, after n `^` expects <IDENTIFIER>."); \
return -1; \
} \
_i++; \
_type = _t[_i]; \
_i++; \
} \
} while (0)
#define ISMONADICOP(_op) (_op == SUB || _op == LNOT || _op == BNOT || _op == BXOR || _op == AT || _op == SIZEOF)
#define ISBINOP(_op) (_op >= MUL && _op <= LNOT)
#define TOKTOOP(_t) ((_t) - MUL)
#define TOKTOASSIGN(_t) ((_t) - ASSIGN)
#define TYPESTR(_type) (_type == -1 ? "?" : (char*) ftptr(&ftident, _type))
#define identstr(_ident) ((char*) ftptr(&ftident, _ident))
#define ASSIGN2OP(_t) (assigntable[_t - assign_offset])
extern FatArena ftident;
extern FatArena ftimmed;
extern FatArena ftlit;
const char *stmtstrs[NSTATEMENT] = {
[SNOP] = "SNOP",
[SSEQ] = "SSEQ",
[SSTRUCT] = "SSTRUCT",
[SENUM] = "SENUM",
[SFUN] = "SFUN",
[SDECL] = "SDECL",
[SIF] = "SIF",
[SELSE] = "SELSE",
[SASSIGN] = "SASSIGN",
[SFOR] = "SFOR",
[SCALL] = "SCALL",
[SACCESSMOD] = "SACCESSMOD",
[SRETURN] = "SRETURN",
[SIMPORT] = "SIMPORT",
[SSIGN] = "SSIGN",
[SMODSIGN] = "SMODSIGN",
[SMODIMPL] = "SMODIMPL",
[SDECLMODIMPL] = "SDECLMODIMPL",
[SMODSKEL] = "SMODSKEL",
[SDECLMODSKEL] = "SDECLMODSKEL",
[SMODDEF] = "SMODDEF",
[SEXPRASSIGN] = "SEXPRASSIGN",
};
const char *exprstrs[NEXPR] = {
[ENONE] = "ENONE",
[ECSTI] = "ECSTI",
[ECSTF] = "ECSTF",
[ECSTS] = "ECSTS",
[ETRUE] = "ETRUE",
[EFALSE] = "EFALSE",
[EMEM] = "EMEM",
[EBINOP] = "EBINOP",
[EUNOP] = "EUNOP",
[ECALL] = "ECALL",
[EACCESS] = "EACCESS",
[ESUBSCR] = "ESUBSCR",
[ESTRUCT] = "ESTRUCT",
[ECAST] = "ECAST",
};
const char *opstrs[OP_NUM] = {
[OP_MUL] = "MUL",
[OP_DIV] = "DIV",
[OP_MOD] = "MOD",
[OP_ADD] = "ADD",
[OP_SUB] = "SUB",
[OP_LSHIFT] = "LSHIFT",
[OP_RSHIFT] = "RSHIFT",
[OP_LT] = "LT",
[OP_GT] = "GT",
[OP_LE] = "LE",
[OP_GE] = "GE",
[OP_EQUAL] = "EQUAL",
[OP_NEQUAL] = "NEQUAL",
[OP_BAND] = "BAND",
[OP_BXOR] = "BXOR",
[OP_BOR] = "BOR",
[OP_LAND] = "LAND",
[OP_LOR] = "LOR",
[OP_BNOT] = "BNOT",
[OP_LNOT] = "LNOT",
};
const char *uopstrs[UOP_NUM] = {
[UOP_SUB] = "SUB",
[UOP_LNOT] = "LNOT",
[UOP_BNOT] = "BNOT",
[UOP_DEREF] = "DEREF",
[UOP_AT] = "AT",
[UOP_SIZEOF] = "SIZEOF",
};
const char *modsymstrs[NMODSYM] = {
[MODSIGN] = "MODSIGN",
[MODSKEL] = "MODSKEL",
[MODIMPL] = "MODIMPL",
[MODDEF] = "MODDEF",
};
static const int assign_offset = ASSIGN;
static const Op assigntable[MOD_ASSIGN - ASSIGN + 1] = {
[ASSIGN - ASSIGN] = -1,
[BAND_ASSIGN - ASSIGN] = OP_BAND,
[BOR_ASSIGN - ASSIGN] = OP_BOR,
[BXOR_ASSIGN - ASSIGN] = OP_BXOR,
[BNOT_ASSIGN - ASSIGN] = OP_BNOT,
[LAND_ASSIGN - ASSIGN] = OP_LAND,
[LOR_ASSIGN - ASSIGN] = OP_LOR,
[LSHIFT_ASSIGN - ASSIGN] = OP_LSHIFT,
[RSHIFT_ASSIGN - ASSIGN] = OP_RSHIFT,
[ADD_ASSIGN - ASSIGN] = OP_ADD,
[SUB_ASSIGN - ASSIGN] = OP_SUB,
[MUL_ASSIGN - ASSIGN] = OP_MUL,
[DIV_ASSIGN - ASSIGN] = OP_DIV,
[MOD_ASSIGN - ASSIGN] = OP_MOD,
};
void printexpr(FILE *fd, intptr expr);
static int parse_expression(const ETok *t, const ETok *eoe, intptr *expr);
static int parse_stmt_block(const ETok *t, intptr *stmt);
static int parse_call(const ETok *t, intptr ident, intptr *d);
static int parse_otherop(const ETok *t, const ETok *eoe, intptr *expr);
static int parse_fun_stmt(const ETok *t, const ETok *eoe, intptr *stmt);
static void
printptrlvl(FILE *fd, int ptrlvl)
{
while (ptrlvl-- > 0) {
fprintf(fd, "^");
}
}
static void
printtype(FILE *fd, intptr type, int ptrlvl)
{
printptrlvl(fd, ptrlvl);
char *ctype = TYPESTR(type);
fprintf(fd, "%s", ctype);
}
static void
printmembers(FILE *fd, intptr members, int nmember)
{
SMember* m = (SMember*) ftptr(&ftast, members);
for (int i = 0; i < nmember; i++) {
fprintf(fd, ", %s : ", (char*) ftptr(&ftident, m->ident));
printtype(fd, m->type, m->ptrlvl);
m++;
}
}
static void
printgenerics(FILE *fd, intptr generics)
{
if (generics == -1) {
fprintf(fd, "[]");
return;
}
SGenerics *g = (SGenerics*) ftptr(&ftast, generics);
intptr *gens = (intptr*) ftptr(&ftast, g->generics);
fprintf(fd, "[");
for (int i = 0; i < g->ngen; i++) {
fprintf(fd, "%s", identstr(gens[i]));
if (i < g->ngen - 1) {
fprintf(fd, ", ");
}
}
fprintf(fd, "]");
}
static void
printsignature(FILE *fd, SSignature *s)
{
fprintf(fd, "%s: %s", identstr(s->ident), identstr(s->signature));
printgenerics(fd, s->generics);
}
static void
printsignatures(FILE *fd, intptr signatures)
{
if (signatures == -1) {
fprintf(fd, "()");
return;
}
SSignatures *s = (SSignatures*) ftptr(&ftast, signatures);
SSignature *ss = (SSignature*) ftptr(&ftast, s->signs);
fprintf(fd, "(");
for (int i = 0; i < s->nsign; i++) {
printsignature(fd, ss + i);
if (i < s->nsign - 1) {
fprintf(fd, ", ");
}
}
fprintf(fd, ")");
}
static void
printconvtab(FILE *fd, intptr convtab, int nconv)
{
if (nconv > 0) {
SConv *c = (SConv*) ftptr(&ftast, convtab);
fprintf(fd, "|");
for (int i = 0; i < nconv; i++) {
fprintf(fd, " %s => %s |", identstr(c[i].gen), identstr(c[i].real));
}
return;
}
fprintf(fd, "| |");
}
void
printstmt(FILE *fd, intptr stmt)
{
UnknownStmt *ptr = (UnknownStmt*) ftptr(&ftast, stmt);
if (stmt == -1) {
fprintf(fd, "NOP");
return;
}
switch (*ptr) {
case SNOP:
fprintf(fd, "%s", stmtstrs[*ptr]);
break;
case SSTRUCT: {
SStruct *s = (SStruct*) ptr;
fprintf(fd, "%s(%s", stmtstrs[*ptr], (char*) ftptr(&ftident, s->ident));
printmembers(fd, s->members, s->nmember);
fprintf(fd, ")");
break;
}
case SDECL: {
SDecl *decl = (SDecl*) ptr;
if (decl->cst) {
fprintf(fd, "const ");
}
fprintf(fd, "%s(%s, ", stmtstrs[*ptr], (char*) ftptr(&ftident, decl->ident));
printexpr(fd, decl->expr);
fprintf(fd, ") : ");
printtype(fd, decl->type, decl->ptrlvl);
break;
}
case SFUN: {
SFun *fun = (SFun*) ptr;
fprintf(fd, "%s(%s", stmtstrs[*ptr], (char*)ftptr(&ftident, fun->ident));
printmembers(fd, fun->params, fun->nparam);
fprintf(fd, ", {");
printstmt(fd, fun->stmt);
fprintf(fd, "}");
fprintf(fd, ") : ");
printptrlvl(fd, fun->ptrlvl);
char *ret = fun->type == -1 ? "void" : identstr(fun->type);
fprintf(fd, "%s", ret);
return;
}
case SSIGN: {
SSign *fun = (SSign*) ptr;
fprintf(fd, "%s(%s", stmtstrs[*ptr], (char*)ftptr(&ftident, fun->ident));
printmembers(fd, fun->params, fun->nparam);
fprintf(fd, ") : ");
printptrlvl(fd, fun->ptrlvl);
char *ret = fun->type == -1 ? "void" : identstr(fun->type);
fprintf(fd, "%s", ret);
return;
}
case SRETURN: {
SReturn *ret = (SReturn*) ptr;
fprintf(fd, "%s(", stmtstrs[*ptr]);
printexpr(fd, ret->expr);
fprintf(fd, ")");
return;
}
case SASSIGN: {
SAssign *assign = (SAssign*) ptr;
fprintf(fd, "%s(%s, ", stmtstrs[*ptr], (char*) ftptr(&ftident, assign->ident));
printexpr(fd, assign->expr);
fprintf(fd, ")");
return;
}
case SEXPRASSIGN: {
SExprAssign *a = (SExprAssign*) ptr;
fprintf(fd, "%s(", stmtstrs[*ptr]);
printexpr(fd, a->left);
fprintf(fd, ", ");
printexpr(fd, a->right);
fprintf(fd, ")");
return;
}
case SIF: {
SIf *_if = (SIf*) ptr;
fprintf(fd, "%s(", stmtstrs[*ptr]);
printexpr(fd, _if->cond);
fprintf(fd, ", ");
printstmt(fd, _if->ifstmt);
if (_if->elsestmt > 0) {
fprintf(fd, ", ELSE ");
printstmt(fd, _if->elsestmt);
}
fprintf(fd, ")");
return;
}
case SSEQ: {
SSeq *seq = (SSeq*) ptr;
fprintf(fd, "%s(", stmtstrs[*ptr]);
printstmt(fd, seq->stmt);
fprintf(fd, ", ");
printstmt(fd, seq->nxt);
fprintf(fd, ")");
return;
}
case SFOR: {
SFor *_for = (SFor*) ptr;
fprintf(fd, "%s(", stmtstrs[*ptr]);
printstmt(fd, _for->stmt1);
fprintf(fd, ", ");
printexpr(fd, _for->expr);
fprintf(fd, ", ");
printstmt(fd, _for->stmt2);
fprintf(fd, ", ");
printstmt(fd, _for->forstmt);
fprintf(fd, ")");
return;
}
case SCALL: {
SCall *call = (SCall*) ptr;
fprintf(fd, "%s(%s", stmtstrs[*ptr], (char*) ftptr(&ftident, call->ident));
intptr *paramtab = (intptr*) ftptr(&ftast, call->params);
for (int i = 0; i < call->nparam; i++) {
fprintf(fd, ", ");
printexpr(fd, paramtab[i]);
}
fprintf(fd, ")");
return;
}
case SACCESSMOD: {
SAccessMod *a = (SAccessMod*) ptr;
fprintf(fd, "%s(%s, ", stmtstrs[*ptr], identstr(a->mod));
printstmt(fd, a->stmt);
fprintf(fd, ")");
return;
}
case SIMPORT: {
SImport *import = (SImport*) ptr;
fprintf(fd, "%s(%s)", stmtstrs[*ptr], (char*) ftptr(&ftlit, import->lit));
return;
}
case SMODSIGN: {
SModSign *s = (SModSign*) ptr;
fprintf(fd, "%s(%s, ", stmtstrs[*ptr], identstr(s->ident));
printgenerics(fd, s->generics);
fprintf(fd, ", ");
printsignatures(fd, s->signatures);
fprintf(fd, ", {");
intptr *stmt = (intptr*) ftptr(&ftast, s->stmts);
for (int i = 0; i < s->nstmt; i++) {
printstmt(fd, stmt[i]);
if (i < s->nstmt - 1) {
fprintf(fd, ", ");
}
}
fprintf(fd, "})");
return;
}
case SDECLMODIMPL:
case SMODIMPL: {
SModImpl *s = (SModImpl*) ptr;
fprintf(fd, "%s(%s, ", stmtstrs[*ptr], identstr(s->ident));
printgenerics(fd, s->generics);
fprintf(fd, ", ");
printsignatures(fd, s->modules);
fprintf(fd, ", ");
printconvtab(fd, s->convtab, s->nconv);
fprintf(fd, ", {");
intptr *stmt = (intptr*) ftptr(&ftast, s->stmts);
for (int i = 0; i < s->nstmt; i++) {
printstmt(fd, stmt[i]);
if (i < s->nstmt - 1) {
fprintf(fd, ", ");
}
}
fprintf(fd, "}) : %s", identstr(s->signature));
return;
}
case SDECLMODSKEL:
case SMODSKEL: {
SModSkel *s = (SModSkel*) ptr;
fprintf(fd, "%s(%s, ", stmtstrs[*ptr], identstr(s->ident));
intptr *stmt = (intptr*) ftptr(&ftast, s->stmts);
for (int i = 0; i < s->nstmt; i++) {
printstmt(fd, stmt[i]);
if (i < s->nstmt - 1) {
fprintf(fd, ", ");
}
}
fprintf(fd, "}) : %s", identstr(s->signature));
return;
}
case SMODDEF: {
SModDef *s = (SModDef*) ptr;
fprintf(fd, "%s(%s, ", stmtstrs[*ptr], identstr(s->ident));
printgenerics(fd, s->generics);
fprintf(fd, ", ");
printsignatures(fd, s->modules);
fprintf(fd, ", ");
printconvtab(fd, s->convtab, s->nconv);
fprintf(fd, ") : ");
printtype(fd, s->skeleton, -1);
return;
}
default:
ERR(" Unreachable statement in printstmt.");
assert(1 || "Unreachable stmt");
}
}
void
printexpr(FILE* fd, intptr expr)
{
UnknownExpr* ptr = (UnknownExpr*) ftptr(&ftast, expr);
switch (*ptr) {
case ENONE:
fprintf(fd, "%s", exprstrs[*ptr]);
return;
case ECSTI: {
Csti *csti = (Csti*) ptr;
fprintf(fd, "%s(%ld)", exprstrs[*ptr], *((int64_t*) ftptr(&ftimmed, csti->addr)));
return;
}
case ECSTF: {
Cstf *cstf = (Cstf*) ptr;
fprintf(fd, "%s(%f)", exprstrs[*ptr], *((double*) ftptr(&ftimmed, cstf->addr)));
return;
}
case ECSTS: {
Csts *csts = (Csts*) ptr;
fprintf(fd, "%s(%s)", exprstrs[*ptr], (char*) ftptr(&ftlit, csts->addr));
return;
}
case ETRUE:
case EFALSE:
fprintf(fd, "%s", exprstrs[*ptr]);
return;
case EMEM: {
Mem *mem = (Mem*) ptr;
char* type = TYPESTR(mem->type);
fprintf(fd, "%s(%s) : ", exprstrs[*ptr], (char*) ftptr(&ftident, mem->addr));
int ptrlvl = mem->ptrlvl;
while (ptrlvl -- > 0) {
fprintf(fd, "^");
}
fprintf(fd, "%s", type);
return;
}
case EBINOP: {
EBinop *binop = (EBinop*) ptr;
fprintf(fd, "%s(%s, ", exprstrs[*ptr], opstrs[binop->op]);
printexpr(fd, binop->left);
fprintf(fd, ", ");
printexpr(fd, binop->right);
fprintf(fd, ") : ");
printtype(fd, binop->type, binop->ptrlvl);
return;
}
case EUNOP: {
EUnop *unop = (EUnop*) ptr;
fprintf(fd, "%s(%s, ", exprstrs[*ptr], uopstrs[unop->op]);
printexpr(fd, unop->expr);
fprintf(fd, ") : ");
printtype(fd, unop->type, unop->ptrlvl);
return;
}
case ECALL: {
ECall *call = (ECall*) ptr;
intptr *paramtab = (intptr*) ftptr(&ftast, call->params);
fprintf(fd, "%s(", exprstrs[*ptr]);
printexpr(fd, call->expr);
for (int i = 0; i < call->nparam; i++) {
fprintf(fd, ", ");
printexpr(fd, paramtab[i]);
}
fprintf(fd, ") : ");
printtype(fd, call->type, call->ptrlvl);
return;
}
case EACCESS: {
EAccess *ac = (EAccess*) ptr;
fprintf(fd, "%s(", exprstrs[*ptr]);
printexpr(fd, ac->expr);
fprintf(fd, ".");
fprintf(fd, "%s", (char*) ftptr(&ftident, ac->ident));
fprintf(fd, ") : ");
printtype(fd, ac->type, ac->ptrlvl);
return;
}
case ESUBSCR: {
ESubscr *sb = (ESubscr*) ptr;
fprintf(fd, "%s(", exprstrs[*ptr]);
printexpr(fd, sb->expr);
fprintf(fd, "[");
printexpr(fd, sb->idxexpr);
fprintf(fd, "]) : ");
printtype(fd, sb->type, sb->ptrlvl);
return;
}
case ESTRUCT: {
EStruct *st = (EStruct*) ptr;
fprintf(fd, "%s(%s { ", exprstrs[*ptr], (char*) ftptr(&ftident, st->ident));
EElem *elem = (EElem*) ftptr(&ftast, st->elems);
for (int i = 0; i < st->nelem; i++) {
fprintf(fd, "<%s : ", (char*) ftptr(&ftident, elem->ident));
printexpr(fd, elem->expr);
fprintf(fd, "> ");
elem++;
}
fprintf(fd, "})");
return;
}
case ECAST: {
ECast *c = (ECast*) ptr;
fprintf(fd, "%s(", exprstrs[*ptr]);
printexpr(fd, c->expr);
fprintf(fd, " as ");
printtype(fd, c->type, c->ptrlvl);
return;
}
default:
assert(1 || "Unreachable epxr");
}
}
static int
parse_param(const ETok *t, SFun* fun)
{
int i = 0;
if (t[i] != LPAREN) {
ERR("ERR: Unexpected token <%s> when parsing the functions param.\n Expected `fun` `(`<param> `)`", tokenstrs[t[i]]);
return -1;
}
i++;
intptr maddr = ftalloc(&ftast, sizeof(SMember));
fun->params = maddr;
fun->nparam = 0;
SMember* member = (SMember*) ftptr(&ftast, maddr);
while (t[i] != RPAREN) {
int ident = -1;
int type = -1;
int ptrlvl = 0;
fun->nparam++;
if (t[i] != IDENTIFIER) {
ERR("Unexpected token <%s> when parsing the functions param.\n|> Expected a param: <IDENTIFIER> `:` <IDENTIFIER>", tokenstrs[t[i]]);
return -1;
}
i++;
ident = t[i];
i++;
if (t[i] != COLON) {
ERR("Unexpected token <%s> when parsing the functions param.\n|> Expected a param: <IDENTIFIER> `:` <IDENTIFIER>", tokenstrs[t[i]]);
return -1;
}
i++;
PTRLVL(t, i, type, ptrlvl);
if (ptrlvl == 0) {
if (t[i] != IDENTIFIER) {
ERR("Unexpected token <%s> when parsing the functions param.\n|> Expected a param: <IDENTIFIER> `:` <IDENTIFIER>", tokenstrs[t[i]]);
return -1;
}
i++;
type = t[i];
i++;
}
member->type = type;
member->ident = ident;
member->ptrlvl = ptrlvl;
if (t[i] != COMMA && t[i] != RPAREN) {
ERR("Unexpected token <%s> when parsing the functions param.\n|> Expected a `,` or `)`.", tokenstrs[t[i]]);
return -1;
}
if (t[i] == COMMA) {
i++;
member++;
ftalloc(&ftast, sizeof(SMember));
}
}
i++;
return i;
}
static int
parse_stmt_return(const ETok *t, const ETok *eoe, intptr *stmt)
{
int i = 0;
int res = -1;
intptr saddr = ftalloc(&ftast, sizeof(SReturn));
*stmt = saddr;
SReturn *ret = (SReturn*) ftptr(&ftast, saddr);
ret->kind = SRETURN;
res = parse_expression(t + i, eoe, &ret->expr);
if (res < 0) {
ERR("parse expression in a function.");
return -1;
}
i += res;
ISTOK(t[i], eoe, res);
if (!res) {
ERR("The return doesn't finish with the correct token.");
ERR("Tok(%d): %s, Eoe:", t[i], tokenstrs[t[i]]);
return -1;
}
i++;
return i;
}
static int
parse_stmt_assignexpr(const ETok *t, const ETok *eoe, const intptr left, intptr *stmt)
{
int i = 0;
int res = -1;
intptr aaddr = ftalloc(&ftast, sizeof(SExprAssign));
*stmt = aaddr;
SExprAssign *a = (SExprAssign*) ftptr(&ftast, aaddr);
a->kind = SEXPRASSIGN;
a->left = left;
if (t[i] < ASSIGN || t[i] > MOD_ASSIGN) {
ERR("Expects an assign but found <%s>.", tokenstrs[t[i]]);
return -1;
}
int op = ASSIGN2OP(t[i]);
i++;
intptr *expr = &a->right;
if (op != -1) {
intptr baddr = ftalloc(&ftast, sizeof(EBinop));
a->right = baddr;
EBinop *b = (EBinop*) ftptr(&ftast, baddr);
b->kind = EBINOP;
b->op = op;
b->type = -1;
b->ptrlvl = 0;
b->left = left;
expr = &b->right;
}
res = parse_expression(t + i, eoe, expr);
if (res < 0) {
ERR("parse expression in a function.");
return -1;
}
i += res;
ISTOK(t[i], eoe, res);
if (!res) {
ERR("The assign doesn't finish with the correct token.");
ERR("Tok(%d): %s, Eoe:", t[i], tokenstrs[t[i]]);
return -1;
}
// consume `;`
i++;
return i;
}
static int
parse_stmt_assign(const ETok *t, const ETok *eoe, const intptr ident, const int op, intptr *stmt)
{
int i = 0;
int res = -1;
intptr aaddr = ftalloc(&ftast, sizeof(SAssign));
*stmt = aaddr;
SAssign *assign = (SAssign*) ftptr(&ftast, aaddr);
assign->kind = SASSIGN;
assign->ident = ident;
intptr *expr = &assign->expr;
if (op != -1) {
intptr baddr = ftalloc(&ftast, sizeof(EBinop));
assign->expr = baddr;
EBinop *b = (EBinop*) ftptr(&ftast, baddr);
b->kind = EBINOP;
b->op = op;
b->type = -1;
b->ptrlvl = 0;
intptr maddr = ftalloc(&ftast, sizeof(Mem));
Mem *mem = (Mem*) ftptr(&ftast, maddr);
mem->addr = ident;
mem->kind = EMEM;
mem->type = -1;
mem->ptrlvl = 0;
b->left = maddr;
expr = &b->right;
}
res = parse_expression(t + i, eoe, expr);
if (res < 0) {
ERR("parse expression in a function.");
return -1;
}
i += res;
ISTOK(t[i], eoe, res);
if (!res) {
ERR("The assign doesn't finish with the correct token.");
ERR("Tok(%d): %s, Eoe:", t[i], tokenstrs[t[i]]);
return -1;
}
// consume `;`
i++;
return i;
}
static int
parse_stmt_call(const ETok *t, const ETok *eoe, const intptr ident, intptr *stmt)
{
int i = 0;
int res = -1;
intptr caddr = -1;
res = parse_call(t + i, ident, &caddr);
if (res < 0) {
ERR("Error when paring a call statement in a function.");
return -1;
}
i += res;
*stmt = caddr;
SCall *call = (SCall*) ftptr(&ftast, caddr);
call->kind = SCALL;
ISTOK(t[i], eoe, res);
if (!res) {
ERR("The call declaration doesn't finish with the correct token.");
ERR("Tok(%d): %s, Eoe:", t[i], tokenstrs[t[i]]);
return -1;
}
// consume
i++;
return i;
}
static int
parse_stmt_decl(const ETok *t, const ETok *eoe, const intptr ident, intptr *stmt)
{
int i = 0;
int res = -1;
int cst = -1;
int type = -1;
int ptrlvl = 0;
if (t[i] != COLON) {
ERR("Unexpected token <%s> at the beginning of a statement.\n|> Expects `:`", tokenstrs[t[i]]);
return -1;
}
i++;
PTRLVL(t, i, type, ptrlvl);
if (ptrlvl == 0 && t[i] == IDENTIFIER) {
i++;
type = t[i];
i++;
}
if (t[i] == COLON) {
i++;
cst = 1;
} else if (t[i] == ASSIGN) {
i++;
cst = 0;
} else {
ERR("Unexpected token <%s> in a declaration statement.", tokenstrs[t[i]]);
return -1;
}
intptr daddr = ftalloc(&ftast, sizeof(SDecl));
*stmt = daddr;
SDecl *decl = (SDecl*) ftptr(&ftast, daddr);
decl->kind = SDECL;
decl->cst = cst;
decl->type = type;
decl->ident = ident;
decl->ptrlvl = ptrlvl;
res = parse_expression(t + i, eoe, &decl->expr);
if (res < 0) {
ERR("parsing expression in a declaration statement");
return -1;
}
i += res;
// consume `;`
i++;
return i;
}
static int
parse_stmt_if(const ETok *t, intptr *stmt)
{
const ETok eoe[] = {LBRACES, UNDEFINED};
int i = 0;
int res = -1;
intptr iaddr = ftalloc(&ftast, sizeof(SIf));
*stmt = iaddr;
SIf *_if = (SIf*) ftptr(&ftast, iaddr);
_if->kind = SIF;
res = parse_expression(t + i, eoe, &_if->cond);
if (res < 0) {
ERR("parsing expression in a declaration statement");
return -1;
}
i += res;
intptr ifstmt = -1;
intptr elsestmt = -1;
res = parse_fun_stmt(t + i, eoe, &ifstmt);
if (res < 0) {
ERR("parsing statements in a if statement");
return -1;
}
i += res;
const ETok eoeelse[] = {SEMICOLON, UNDEFINED};
if (t[i] == ELSE) {
i++;
res = parse_fun_stmt(t + i, eoeelse, &elsestmt);
if (res < 0) {
ERR("Error when parsing the else stmt.");
return -1;
}
i += res;
}
_if->ifstmt = ifstmt;
_if->elsestmt = elsestmt;
return i;
}
static int
parse_stmt_for(const ETok *t, intptr *stmt)
{
const ETok eoe[] = {SEMICOLON, UNDEFINED};
const ETok eoe2[] = {SEMICOLON, LBRACES, UNDEFINED};
int i = 0;
int res = -1;
intptr stmt1, stmt2, expr, forstmt = -1;
res = parse_fun_stmt(t + i, eoe, &stmt1);
if (res < 0) {
ERR("Error when parsing the first statement of a forloop. Exepects: `for` `stmt`; `expr` `;` `stmt` `{` stmt `}`");
return -1;
}
i += res;
res = parse_expression(t + i, eoe, &expr);
if (res < 0) {
ERR("Error when parsing the expression of a forloop. Exepects: `for` `stmt`; `expr` `;` `stmt` `{` stmt `}`");
return -1;
}
i += res;
// Consume `;`
if (t[i] != SEMICOLON) {
ERR("Error when parsing the expression of a forloop. Exepects: `for` `stmt`; `expr` `;` `stmt` `{` stmt `}`");
return -1;
}
i++;
res = parse_fun_stmt(t + i, eoe2, &stmt2);
if (res < 0) {
ERR("Error when parsing the second statement of a forloop. Exepects: `for` `stmt`; `expr` `;` `stmt` `{` stmt `}`");
return -1;
}
i += res;
if (t[i - 1] == LBRACES) {
// cancel the consume
i--;
}
res = parse_fun_stmt(t + i, eoe, &forstmt);
if (res < 0) {
ERR("Error when parsing statements in a forloop.");
return -1;
}