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parsing things

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This commit is contained in:
Blendi
2026-04-13 18:42:52 +02:00
parent 8fc846d5a1
commit bc2bc1efa2
4 changed files with 144 additions and 8 deletions
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97
src/parser.c
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@@ -4,8 +4,8 @@
int noomP_peek(noomP_Parser* parser, noomL_Token* token) {
while (1) {
int success = noomL_lex(parser->code, parser->lex_offset, token);
if (!success) return -1; // TODO: proper error propogation and stuff
if (success != 0) return -1; // TODO: proper error propogation and stuff
if (token->type == NOOML_TOKEN_WHITESPACE) {
// peek changes state, but only if it's one of these useless tokens anyway.
parser->lex_offset += token->length;
@@ -54,7 +54,95 @@ int noomP_addSubnode(noomP_Node* node, noomP_Node* subnode) {
return 0;
}
noomP_Node* noomP_parseExpression(noomP_Parser* parser) {
noomL_Token token;
noomP_peek(parser, &token);
if (token.type == NOOML_TOKEN_NUMBER) {
// uhh figure it out, future me!
noomP_skip(parser, &token);
noomP_Node* numNode = noomP_allocNode(parser);
if (numNode == 0) return 0;
numNode->type = NOOMP_NODE_NUMBERLITERAL;
numNode->source_offset = token.offset;
return numNode;
}
return 0;
}
noomP_Node* noomP_parseStatement(noomP_Parser* parser) {
noomL_Token token;
noomP_peek(parser, &token);
if (token.type == NOOML_TOKEN_KEYWORD) {
if (noom_streql(parser->code + token.offset, token.length, "local", 5)) {
noomP_skip(parser, &token);
noomP_Node* localNode = noomP_allocNode(parser);
if (localNode == 0) return 0; // no memory :(
localNode->source_offset = token.offset;
localNode->type = NOOMP_NODE_LOCALDECLARATION;
while (1) {
noomP_peek(parser, &token);
if (token.type != NOOML_TOKEN_IDENTIFIER) return 0;
noomP_skip(parser, &token);
noomP_Node* varname = noomP_allocNode(parser);
if (varname == 0) return 0;
varname->type = NOOMP_NODE_VARNAME;
varname->source_offset = token.offset;
noomP_addSubnode(localNode, varname);
noomP_peek(parser, &token);
if (token.type == NOOML_TOKEN_SYMBOL) {
if (noom_streql(parser->code + token.offset, token.length, "=", 1)) {
noomP_skip(parser, &token);
break;
} else if (noom_streql(parser->code + token.offset, token.length, ",", 1)) {
noomP_skip(parser, &token);
} else {
return 0; // unexpected token
}
} else {
return 0; // unexpected token
}
}
// equals has already been eaten by loop (thank you loop)
while (1) {
noomP_Node *expr = noomP_parseExpression(parser);
if (expr == 0) return 0;
noomP_addSubnode(localNode, expr);
noomP_peek(parser, &token);
if (token.type == NOOML_TOKEN_SYMBOL) {
if (noom_streql(parser->code + token.offset, token.length, ",", 1)) {
noomP_skip(parser, &token);
} else {
break;
}
} else {
break;
}
}
return localNode;
}
}
return 0;
}
@@ -64,7 +152,9 @@ int noomP_parse(const char* code, const char* filename, noomP_Node** outpointer)
noomL_Token token;
noomP_Node* node = noomP_allocNode(&parser);
if (node == 0) return -1;
node->source_offset = parser.lex_offset;
node->type = NOOMP_NODE_PROGRAM;
while (1) {
@@ -77,8 +167,7 @@ int noomP_parse(const char* code, const char* filename, noomP_Node** outpointer)
noomP_addSubnode(node, child);
}
node->type = NOOMP_NODE_PROGRAM;
node->subnodec = 0;
*outpointer = node;
return 0;
}