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added basic objects

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CPunch
2020-11-03 22:10:51 -06:00
parent fe93a0b715
commit e1d33855c3
9 changed files with 120 additions and 25 deletions
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33
src/cparse.c
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@@ -30,6 +30,7 @@ typedef enum {
PREC_TERM, // + -
PREC_FACTOR, // * /
PREC_UNARY, // ! -
PREC_OBJ, // {}
PREC_CALL, // . ()
PREC_PRIMARY // everything else
} Precedence;
@@ -502,13 +503,41 @@ static void call_(CParseState *pstate, bool canAssign) {
}
}
static void object(CParseState *pstate, bool canAssign) {
// already consumed the beginning '{'
int entries = 0;
consume(pstate, TOKEN_RIGHT_BRACE, "Expected '}' to end object definition!");
writeu8(pstate, OP_NEWOBJECT);
writeu8(pstate, entries);
valuePushed(pstate, 1);
}
static void dot(CParseState *pstate, bool canAssign) {
consume(pstate, TOKEN_IDENTIFIER, "Expect property name after '.'.");
uint8_t name = identifierConstant(pstate, &pstate->previous);
writeu8(pstate, OP_LOADCONST);
writeu16(pstate, name);
valuePushed(pstate, 1);
if (canAssign && match(pstate, TOKEN_EQUAL)) {
expression(pstate);
writeu8(pstate, OP_SETOBJECT);
valuePopped(pstate, 3); // pops key, value & object
} else {
writeu8(pstate, OP_GETOBJECT);
valuePopped(pstate, 1); // pops key & object but also pushes the field so total popped is 1
}
}
ParseRule ruleTable[] = {
[TOKEN_LEFT_PAREN] = {group, call_, PREC_CALL},
[TOKEN_RIGHT_PAREN] = {NULL, NULL, PREC_NONE},
[TOKEN_LEFT_BRACE] = {NULL, NULL, PREC_NONE},
[TOKEN_LEFT_BRACE] = {object, NULL, PREC_OBJ},
[TOKEN_RIGHT_BRACE] = {NULL, NULL, PREC_NONE},
[TOKEN_COMMA] = {NULL, NULL, PREC_NONE},
[TOKEN_DOT] = {NULL, NULL, PREC_NONE},
[TOKEN_DOT] = {NULL, dot, PREC_CALL},
[TOKEN_DOT_DOT] = {NULL, concat, PREC_CONCAT},
[TOKEN_MINUS] = {unary, binary, PREC_TERM},
[TOKEN_PLUS] = {NULL, binary, PREC_TERM},