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fixed multiple assignments from function calls()
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parent
860f30f201
commit
ea4654cb6e
61
src/cparse.c
61
src/cparse.c
@ -75,7 +75,7 @@ typedef enum {
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PREC_PRIMARY // everything else
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} Precedence;
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typedef void (*ParseFunc)(CParseState* pstate, bool canAssign);
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typedef void (*ParseFunc)(CParseState* pstate, bool canAssign, Precedence curPrec);
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typedef struct {
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ParseFunc prefix;
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@ -84,7 +84,6 @@ typedef struct {
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} ParseRule;
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static void parsePrecedence(CParseState*, Precedence);
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static void variable(CParseState *pstate, bool canAssign);
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static int expressionPrecedence(CParseState *pstate, int needed, Precedence prec, bool forceNeeded);
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static int expression(CParseState *pstate, int needed, bool forceNeeded);
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static void statement(CParseState *pstate);
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@ -144,11 +143,12 @@ static void errorAt(CParseState *pstate, CToken *token, const char *format, va_l
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if (pstate->hadError)
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return;
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if (token->type == TOKEN_EOF) {
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cosmoV_pushString(pstate->state, "At end: ");
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} else if (!(token->type == TOKEN_ERROR)) {
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cosmoV_pushFString(pstate->state, "At '%t'", token); // this is why the '%t' exist in cosmoO_pushFString lol
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cosmoV_pushFString(pstate->state, "At '%t': ", token); // this is why the '%t' exist in cosmoO_pushFString lol
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} else {
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cosmoV_pushString(pstate->state, "Lexer error: ");
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}
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cosmoO_pushVFString(pstate->state, format, args);
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@ -395,19 +395,24 @@ static void alignStack(CParseState *pstate, int alignment) {
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pstate->compiler->pushedValues = alignment;
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}
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// last in precedence expression?
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static bool isLast(CParseState *pstate, Precedence pType) {
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return pType > getRule(pstate->current.type)->level;
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}
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// ================================================================ [PARSER] ================================================================
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static void number(CParseState *pstate, bool canAssign) {
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static void number(CParseState *pstate, bool canAssign, Precedence prec) {
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cosmo_Number num = strtod(pstate->previous.start, NULL);
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writeConstant(pstate, cosmoV_newNumber(num));
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}
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static void string(CParseState *pstate, bool canAssign) {
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static void string(CParseState *pstate, bool canAssign, Precedence prec) {
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CObjString *strObj = cosmoO_takeString(pstate->state, pstate->previous.start, pstate->previous.length);
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writeConstant(pstate, cosmoV_newObj((CObj*)strObj));
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}
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static void literal(CParseState *pstate, bool canAssign) {
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static void literal(CParseState *pstate, bool canAssign, Precedence prec) {
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switch (pstate->previous.type) {
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case TOKEN_TRUE: writeu8(pstate, OP_TRUE); break;
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case TOKEN_FALSE: writeu8(pstate, OP_FALSE); break;
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@ -420,7 +425,7 @@ static void literal(CParseState *pstate, bool canAssign) {
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}
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// parses prefix operators
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static void unary(CParseState *pstate, bool canAssign) {
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static void unary(CParseState *pstate, bool canAssign, Precedence prec) {
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CTokenType type = pstate->previous.type;
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int cachedLine = pstate->previous.line; // eval'ing the next expression might change the line number
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@ -437,7 +442,7 @@ static void unary(CParseState *pstate, bool canAssign) {
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}
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// parses infix operators
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static void binary(CParseState *pstate, bool canAssign) {
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static void binary(CParseState *pstate, bool canAssign, Precedence prec) {
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CTokenType type = pstate->previous.type; // already consumed
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int cachedLine = pstate->previous.line; // eval'ing the next expression might change the line number
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@ -464,7 +469,7 @@ static void binary(CParseState *pstate, bool canAssign) {
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valuePopped(pstate, 1); // we pop 2 values off the stack and push 1 for a net pop of 1 value
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}
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static void group(CParseState *pstate, bool canAssign) {
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static void group(CParseState *pstate, bool canAssign, Precedence prec) {
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expression(pstate, 1, true);
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consume(pstate, TOKEN_RIGHT_PAREN, "Expected ')'");
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}
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@ -554,7 +559,7 @@ static void namedVariable(CParseState *pstate, CToken name, bool canAssign, bool
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}
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}
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static void and_(CParseState *pstate, bool canAssign) {
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static void and_(CParseState *pstate, bool canAssign, Precedence prec) {
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int jump = writeJmp(pstate, OP_EJMP); // conditional jump without popping
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writePop(pstate, 1);
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@ -563,7 +568,7 @@ static void and_(CParseState *pstate, bool canAssign) {
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patchJmp(pstate, jump);
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}
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static void or_(CParseState *pstate, bool canAssign) {
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static void or_(CParseState *pstate, bool canAssign, Precedence prec) {
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int elseJump = writeJmp(pstate, OP_EJMP);
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int endJump = writeJmp(pstate, OP_JMP);
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@ -575,15 +580,15 @@ static void or_(CParseState *pstate, bool canAssign) {
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patchJmp(pstate, endJump);
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}
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static void anonFunction(CParseState *pstate, bool canAssign) {
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static void anonFunction(CParseState *pstate, bool canAssign, Precedence prec) {
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function(pstate, FTYPE_FUNCTION);
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}
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static void variable(CParseState *pstate, bool canAssign) {
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static void variable(CParseState *pstate, bool canAssign, Precedence prec) {
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namedVariable(pstate, pstate->previous, canAssign, true, 0);
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}
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static void concat(CParseState *pstate, bool canAssign) {
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static void concat(CParseState *pstate, bool canAssign, Precedence prec) {
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CTokenType type = pstate->previous.type;
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int vars = 1; // we already have something on the stack
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@ -598,19 +603,25 @@ static void concat(CParseState *pstate, bool canAssign) {
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valuePopped(pstate, vars - 1); // - 1 because we're pushing the concat result
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}
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static void call_(CParseState *pstate, bool canAssign) {
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static void call_(CParseState *pstate, bool canAssign, Precedence prec) {
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// we enter having already consumed the '('
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int returnNum = pstate->compiler->expectedValues;
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// grab our arguments
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uint8_t argCount = parseArguments(pstate);
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valuePopped(pstate, argCount + 1); // all of these values will be popped off the stack when returned (+1 for the function)
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writeu8(pstate, OP_CALL);
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writeu8(pstate, argCount);
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writeu8(pstate, pstate->compiler->expectedValues);
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valuePushed(pstate, pstate->compiler->expectedValues);
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// if we're not the last token in this expression or we're expecting multiple values, we should return only 1 value!!
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if (!isLast(pstate, prec) || (returnNum > 1 && check(pstate, TOKEN_COMMA)))
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returnNum = 1;
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writeu8(pstate, returnNum);
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valuePushed(pstate, returnNum);
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}
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static void object(CParseState *pstate, bool canAssign) {
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static void object(CParseState *pstate, bool canAssign, Precedence prec) {
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// already consumed the beginning '{'
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int entries = 0;
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@ -637,7 +648,7 @@ static void object(CParseState *pstate, bool canAssign) {
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valuePushed(pstate, 1);
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}
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static void dot(CParseState *pstate, bool canAssign) {
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static void dot(CParseState *pstate, bool canAssign, Precedence prec) {
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consume(pstate, TOKEN_IDENTIFIER, "Expected property name after '.'.");
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uint16_t name = identifierConstant(pstate, &pstate->previous);
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@ -672,7 +683,7 @@ static void dot(CParseState *pstate, bool canAssign) {
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}
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}
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static void _index(CParseState *pstate, bool canAssign) {
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static void _index(CParseState *pstate, bool canAssign, Precedence prec) {
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expression(pstate, 1, true);
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consume(pstate, TOKEN_RIGHT_BRACKET, "Expected ']' to end index.");
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@ -795,7 +806,7 @@ static void increment(CParseState *pstate, int val) {
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}
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// ++i
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static void preincrement(CParseState *pstate, bool canAssign) {
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static void preincrement(CParseState *pstate, bool canAssign, Precedence prec) {
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// expect identifier
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consume(pstate, TOKEN_IDENTIFIER, "Expected identifier after '++'");
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@ -803,7 +814,7 @@ static void preincrement(CParseState *pstate, bool canAssign) {
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}
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// --i
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static void predecrement(CParseState *pstate, bool canAssign) {
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static void predecrement(CParseState *pstate, bool canAssign, Precedence prec) {
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// expect identifier
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consume(pstate, TOKEN_IDENTIFIER, "Expected identifier after '--'");
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@ -881,12 +892,12 @@ static void parsePrecedence(CParseState *pstate, Precedence prec) {
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return;
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bool canAssign = prec <= PREC_ASSIGNMENT;
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prefix(pstate, canAssign);
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prefix(pstate, canAssign, prec);
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while (prec <= getRule(pstate->current.type)->level) {
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ParseFunc infix = getRule(pstate->current.type)->infix;
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advance(pstate);
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infix(pstate, canAssign);
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infix(pstate, canAssign, prec);
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}
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if (canAssign && match(pstate, TOKEN_EQUAL)) {
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