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Start building AST in parser

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This commit is contained in:
Max Brunsfeld 2014-01-07 21:50:32 -08:00
parent 5813816179
commit 614e497ac4
12 changed files with 262 additions and 50 deletions
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34
src/runtime/parser.c
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@ -3,12 +3,17 @@
static int INITIAL_STACK_SIZE = 100;
struct TSStackEntry {
TSState state;
TSTree *node;
};
TSParser TSParserMake(const char *input) {
TSParser result = {
.tree = TSTreeMake(),
.tree = NULL,
.input = input,
.position = 0,
.lookahead_sym = 0,
.lookahead_node = NULL,
.lex_state = 0,
.stack = calloc(INITIAL_STACK_SIZE, sizeof(TSStackEntry)),
.stack_size = 0,
@ -19,14 +24,21 @@ TSParser TSParserMake(const char *input) {
void TSParserShift(TSParser *parser, TSState parse_state) {
TSStackEntry *entry = (parser->stack + parser->stack_size);
entry->state = parse_state;
entry->symbol = parser->lookahead_sym;
parser->lookahead_sym = -1;
entry->node = parser->lookahead_node;
parser->lookahead_node = NULL;
parser->stack_size++;
}
void TSParserReduce(TSParser *parser, TSSymbol symbol, int child_count) {
parser->lookahead_sym = symbol;
parser->stack_size -= child_count;
TSTree **children = malloc(child_count * sizeof(TSTree *));
for (int i = 0; i < child_count; i++) {
size_t j = parser->stack_size + i;
children[i] = parser->stack[j].node;
}
parser->lookahead_node = TSTreeMake(symbol, child_count, children);
}
void TSParserError(TSParser *parser) {
@ -42,12 +54,13 @@ char TSParserLookaheadChar(const TSParser *parser) {
return parser->input[parser->position];
}
TSSymbol TSParserLookaheadSym(const TSParser *parser) {
return parser->lookahead_sym;
long TSParserLookaheadSym(const TSParser *parser) {
TSTree *node = parser->lookahead_node;
return node ? node->value : -1;
}
void TSParserSetLookaheadSym(TSParser *parser, TSSymbol symbol) {
parser->lookahead_sym = symbol;
parser->lookahead_node = TSTreeMake(symbol, 0, NULL);
}
TSState TSParserParseState(const TSParser *parser) {
@ -61,3 +74,8 @@ TSState TSParserLexState(const TSParser *parser) {
void TSParserSetLexState(TSParser *parser, TSState lex_state) {
parser->lex_state = lex_state;
}
void TSParserAcceptInput(TSParser *parser) {
parser->tree = parser->stack[parser->stack_size - 1].node;
}