forked from NeoFlock/noom
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
#include "parser.h"
|
|
#include "helper.h"
|
|
|
|
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 (token->type == NOOML_TOKEN_WHITESPACE) {
|
|
// peek changes state, but only if it's one of these useless tokens anyway.
|
|
parser->lex_offset += token->length;
|
|
continue;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void noomP_skip(noomP_Parser* parser, noomL_Token* token) { // expects you to alr know the token
|
|
if (token->type == NOOML_TOKEN_EOF) return;
|
|
|
|
parser->lex_offset += token->length;
|
|
}
|
|
|
|
noomP_Node* noomP_allocNode(noomP_Parser* parser) {
|
|
noomP_Node* node = noom_alloc(sizeof(noomP_Node));
|
|
if (node == 0) return 0;
|
|
|
|
node->previous_node = parser->last_node;
|
|
|
|
node->subnodec = 0;
|
|
node->subnodes = noom_alloc(sizeof(noomP_Node*) * 2);
|
|
node->subnode_cap = 2;
|
|
if (node->subnodes == 0) {
|
|
noom_free(node);
|
|
return 0;
|
|
}
|
|
|
|
parser->last_node = node;
|
|
|
|
return node;
|
|
}
|
|
|
|
int noomP_addSubnode(noomP_Node* node, noomP_Node* subnode) {
|
|
if (node->subnodec == node->subnode_cap) {
|
|
node->subnode_cap = node->subnode_cap * 2;
|
|
node->subnodes = noom_realloc(node->subnodes, sizeof(noomP_Node*) * node->subnode_cap);
|
|
|
|
if (node->subnodes == 0) return -1;
|
|
}
|
|
|
|
node->subnodes[node->subnodec++] = subnode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
noomP_Node* noomP_parseStatement(noomP_Parser* parser) {
|
|
return 0;
|
|
}
|
|
|
|
int noomP_parse(const char* code, const char* filename, noomP_Node** outpointer) {
|
|
noomP_Parser parser;
|
|
noomP_initParser(&parser, code, filename);
|
|
|
|
noomL_Token token;
|
|
noomP_Node* node = noomP_allocNode(&parser);
|
|
|
|
node->type = NOOMP_NODE_PROGRAM;
|
|
|
|
while (1) {
|
|
noomP_peek(&parser, &token);
|
|
if (token.type == NOOML_TOKEN_EOF) return 0;
|
|
|
|
noomP_Node* child = noomP_parseStatement(&parser);
|
|
if (child == 0) return -1;
|
|
|
|
noomP_addSubnode(node, child);
|
|
}
|
|
|
|
node->type = NOOMP_NODE_PROGRAM;
|
|
node->subnodec = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int noomP_initParser(noomP_Parser* parser, const char* code, const char* filename) {
|
|
parser->code = code;
|
|
parser->filename = filename;
|
|
parser->lex_offset = 0;
|
|
parser->last_node = (void *)0;
|
|
|
|
return 0;
|
|
}
|