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-rw-r--r--src/include/lexer.h2
-rw-r--r--src/include/parser.h17
-rw-r--r--src/include/pp.h2
-rw-r--r--src/include/tree.h2
-rw-r--r--src/parser.c86
5 files changed, 67 insertions, 42 deletions
diff --git a/src/include/lexer.h b/src/include/lexer.h
index 02275cb..5235f3b 100644
--- a/src/include/lexer.h
+++ b/src/include/lexer.h
@@ -23,7 +23,7 @@ typedef struct LEXER_STRUC {
/* Integer. */
LEXER_STATE_INT,
/* Keyword. */
- LEXER_STATE_KWD,
+ LEXER_STATE_KWD
} state;
/* The linked list of tokens generated. */
diff --git a/src/include/parser.h b/src/include/parser.h
index eae09d4..a442d60 100644
--- a/src/include/parser.h
+++ b/src/include/parser.h
@@ -14,7 +14,7 @@ typedef enum PARSER_STATE {
PARSER_STATE_DARG,
PARSER_STATE_CARG,
PARSER_STATE_DEF,
- PARSER_STATE_CALL,
+ PARSER_STATE_CALL
} parser_state_t;
typedef struct PARSER {
@@ -41,6 +41,15 @@ void parser_destroy(parser_t* parser);
/* Step the parser forward by 1 token. */
int parser_nxt_token(parser_t* parser);
+/* Get tree for first (implied) block. */
+tree_t* parser_parse_init(parser_t* parser);
+
+/* Get tree for a block. */
+tree_t* parser_parse_block(parser_t* parser);
+
+/* Get tree for an expression.*/
+tree_t* parser_parse_expr(parser_t* parser);
+
/*
Check whether the current token matches the given type.
- If it doesn't, return 0 and throw error.
@@ -56,12 +65,6 @@ tree_t* parser_parse_lint(parser_t* parser);
/* Return the tree for a string. */
tree_t* parser_parse_lstr(parser_t* parser);
-/* Return the tree for an expression.*/
-tree_t* parser_parse_expr(parser_t* parser);
-
-/* Return the tree for an block. */
-tree_t* parser_parse_block(parser_t* parser);
-
/* Return the tree for a definition's arguments. */
tree_t* parser_parse_darg(parser_t* parser);
diff --git a/src/include/pp.h b/src/include/pp.h
index 4186ef3..bbb901c 100644
--- a/src/include/pp.h
+++ b/src/include/pp.h
@@ -27,7 +27,7 @@ typedef struct PP_STRUC {
PP_STATE_REG, /* Regular. */
PP_STATE_STR, /* String. */
PP_STATE_COM, /* Comment. */
- PP_STATE_ESC, /* Escaped character in string. */
+ PP_STATE_ESC /* Escaped character in string. */
/* PP_STATE_MCO, */ /* Macro. */
} state;
} pp_t;
diff --git a/src/include/tree.h b/src/include/tree.h
index 31b8f3f..2a62f26 100644
--- a/src/include/tree.h
+++ b/src/include/tree.h
@@ -12,7 +12,7 @@ typedef enum TREE_TYPE {
TREE_TYPE_DARG,
TREE_TYPE_CARG,
TREE_TYPE_DEF,
- TREE_TYPE_CALL,
+ TREE_TYPE_CALL
} tree_type_t;
/* The Abstract Syntax Tree (AST) structure. */
diff --git a/src/parser.c b/src/parser.c
index 2cf9b2c..f94fe53 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -18,6 +18,7 @@ void parser_destroy(parser_t* parser) {
/* TODO: What if the program begins with a ";"? */
int parser_nxt_token(parser_t* parser) {
/* Preserve original token list, to be cleaned up by lexer. */
+ if (!parser->token) { return 0; }
parser->token = parser->token->nxt;
if (parser->token && parser->token->type == TOKEN_TYPE_EXPR_END) {
return parser_nxt_token(parser);
@@ -25,6 +26,59 @@ int parser_nxt_token(parser_t* parser) {
return parser->token ? 1 : 0;
}
+tree_t* parser_parse_init(parser_t* parser) {
+ /* There is nothing to do. */
+ if (!parser->token || parser->token->type == TOKEN_TYPE_RBLOCK) {
+ return NULL;
+ }
+ tree_t* block;
+ block = tree_init(TREE_TYPE_BLOCK);
+
+ block->data.block.val = parser_parse_expr(parser);
+ block->data.block.nxt = parser_parse_block(parser);
+
+ return block;
+}
+
+tree_t* parser_parse_block(parser_t* parser) {
+ /* There is nothing to do. */
+ if (!parser->token || parser->token->type == TOKEN_TYPE_RBLOCK) {
+ parser_nxt_token(parser); /* Skip over closing bracket. */
+ return NULL;
+ }
+ tree_t* block;
+ block = tree_init(TREE_TYPE_BLOCK);
+
+ block->data.block.val = parser_parse_expr(parser);
+ block->data.block.nxt = parser_parse_block(parser);
+
+ parser_nxt_token(parser); /* Skip over semicolon. */
+
+ return block;
+}
+
+tree_t* parser_parse_expr(parser_t* parser) {
+ tree_t* expr = NULL;
+
+ switch (parser->token->type) {
+ case TOKEN_TYPE_INT:
+ expr = parser_parse_lint(parser);
+ break;
+ case TOKEN_TYPE_STR:
+ expr = parser_parse_lstr(parser);
+ break;
+ case TOKEN_TYPE_LBLOCK:
+ parser_nxt_token(parser); /* Skip over opening curly bracket. */
+ expr = parser_parse_block(parser);
+ break;
+ default:
+ log_war("%s: Unknown token type: %d", __func__, parser->token->type);
+ parser_nxt_token(parser);
+ }
+
+ return expr;
+}
+
/* I don't know if these need to exist. Guess I'll wait and see… */
int parser_match(parser_t* parser, token_type_t type) {
return parser->token->type == type;
@@ -59,38 +113,6 @@ tree_t* parser_parse_lstr(parser_t* parser) {
return lstr;
}
-tree_t* parser_parse_expr(parser_t* parser) {
- tree_t* expr = NULL;
-
- switch (parser->token->type) {
- case TOKEN_TYPE_INT:
- expr = parser_parse_lint(parser);
- break;
- case TOKEN_TYPE_STR:
- expr = parser_parse_lstr(parser);
- break;
- default:
- log_war("%s: Unknown token type: %d", __func__, parser->token->type);
- parser_nxt_token(parser);
- }
-
- return expr;
-}
-
-tree_t* parser_parse_block(parser_t* parser) {
- /* There is nothing to do. */
- if (!parser->token || parser->token->type == TOKEN_TYPE_RBLOCK) {
- return NULL;
- }
- tree_t* block;
- block = tree_init(TREE_TYPE_BLOCK);
-
- block->data.block.val = parser_parse_expr(parser);
- block->data.block.nxt = parser_parse_block(parser);
-
- return block;
-}
-
tree_t* parser_parse_tag(parser_t* parser) {
if (parser->token->type != TOKEN_TYPE_TAG) { return NULL; }
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 04:29:24 +0000