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better unary increment support for indexes & fields

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CPunch 2021-01-01 22:09:42 -06:00
parent be7a291ff2
commit c96b155412
1 changed files with 66 additions and 14 deletions
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80
src/cparse.c
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@ -646,7 +646,62 @@ static void _index(CParseState *pstate, bool canAssign) {
writeu8(pstate, OP_INDEX);
}
valuePopped(pstate, 1); // pops key & object but also pushes the field so total popped is 1
valuePopped(pstate, 1); // pops key & object but also pushes the value so total popped is 1
}
// ++test.field[1]
static void walkIndexes(CParseState *pstate, int lastIndexType, uint16_t lastIdent, int val) {
uint16_t ident = lastIdent;
int indexType = lastIndexType;
while (true) {
if (match(pstate, TOKEN_DOT)) {
consume(pstate, TOKEN_IDENTIFIER, "Expected property name after '.'.");
ident = identifierConstant(pstate, &pstate->previous);
indexType = 0;
} else if (match(pstate, TOKEN_LEFT_BRACKET)) {
indexType = 1;
} else // end of indexes, break out of the loop
break;
switch (lastIndexType) {
case 0: // .
writeu8(pstate, OP_LOADCONST); // pushes ident to stack
writeu16(pstate, lastIdent);
writeu8(pstate, OP_GETOBJECT); // grabs property
break;
case 1: // []
writeu8(pstate, OP_INDEX); // so, that was a normal index, perform that
valuePopped(pstate, 1); // pops the key & dict off the stack, but pushes the value
break;
default: // no previous index
break;
}
if (indexType == 1) { // currently parsed token was a TOKEN_LEFT_BRACKET, meaning an index
expression(pstate, 1, true); // grabs key
consume(pstate, TOKEN_RIGHT_BRACKET, "Expected ']' to end index.");
}
lastIndexType = indexType;
lastIdent = ident;
}
switch (indexType) {
case 0: // .
writeu8(pstate, OP_INCOBJECT);
writeu8(pstate, 128 + val); // setting signed values in an unsigned int
writeu16(pstate, ident);
valuePopped(pstate, 1); // popped the object off the stack
break;
case 1: // []
writeu8(pstate, OP_INCINDEX);
writeu8(pstate, 128 + val);
valuePopped(pstate, 2); // popped the dictionary & the key off the stack, but pushes the previous value
break;
default: // no previous index
break;
}
}
static void increment(CParseState *pstate, int val) {
@ -656,20 +711,17 @@ static void increment(CParseState *pstate, int val) {
consume(pstate, TOKEN_IDENTIFIER, "Expected property name after '.'.");
uint16_t ident = identifierConstant(pstate, &pstate->previous);
while (match(pstate, TOKEN_DOT)) {
// grab the field from the object
writeu8(pstate, OP_LOADCONST); // pushes ident to stack
writeu16(pstate, ident);
writeu8(pstate, OP_GETOBJECT);
consume(pstate, TOKEN_IDENTIFIER, "Expected property name after '.'.");
ident = identifierConstant(pstate, &pstate->previous);
}
// walk the indexes
walkIndexes(pstate, 0, ident, val);
} else if (match(pstate, TOKEN_LEFT_BRACKET)) { // dictionary?
namedVariable(pstate, name, false, false); // just get the dictionary
writeu8(pstate, OP_INCOBJECT);
writeu8(pstate, 128 + val); // setting signed values in an unsigned int
writeu16(pstate, ident);
valuePopped(pstate, 1); // popped the object off the stack
// grab key
expression(pstate, 1, true);
consume(pstate, TOKEN_RIGHT_BRACKET, "Expected ']' to end index.");
// walk the indexes
walkIndexes(pstate, 1, 0, val);
} else {
uint8_t op;
int arg = getLocal(pstate->compiler, &name);