1 files changed, 98 insertions, 0 deletions
diff --git a/syntax.h b/syntax.h
new file mode 100644
index 0000000..b395705
--- /dev/null
+++ b/syntax.h
@@ -0,0 +1,98 @@
+# pragma once
+
+#include "utils.h"
+
+
+typedef enum {
+    PLUS,
+    MINUS,
+    MULT,
+    DIV,
+} BinOp;
+
+typedef enum {
+    ARITHM_INT_LIT,
+    ARITHM_BINOP,
+} ArithmNodeKind;
+
+typedef struct ArithmNode ArithmNode;
+struct ArithmNode {
+    ArithmNodeKind kind;
+    union {
+        int lit_val;
+        struct {
+            BinOp op;
+            ArithmNode* left;
+            ArithmNode* right;
+        } binop;
+    } as;
+};
+DECLARE_VEC(ArithmNode, ArithmNodeVec)
+
+
+typedef struct {
+    ArithmNodeVec nodes;
+    ArithmNode* root;
+} ArithmAst;
+ 
+
+typedef enum {
+    UN_Q,
+    SINGLE_Q,
+    DOUBLE_Q,
+} QuotationMode;
+
+typedef enum {
+    CHUNK_LIT,
+    CHUNK_VAR,
+    CHUNK_CMDSUB,
+    CHUNK_ARITHM,
+} ChunkKind;
+
+typedef struct {
+    QuotationMode qmode;
+    ChunkKind kind;
+    union {
+        char* lit_str;
+        char* varname;
+        ArithmAst arithm_expr;
+        // TODO: CHUNK_CMDSUB
+    } as;
+} Chunk;
+
+DECLARE_VEC(Chunk, Word)
+
+
+typedef enum {
+    TOK_WORD,
+    TOK_SPEC,
+    TOK_SUB_IN,
+    TOK_SUB_OUT,
+} TokenKind;
+
+typedef enum {
+    SPEC_PIPE,
+    SPEC_REDIR_W_TRUNC,
+    SPEC_REDIR_W_APPEND,
+    SPEC_REDIR_R,
+    SPEC_EOL,
+} SpecialToken;
+
+typedef struct Token Token;
+DECLARE_VEC(Token*, TokenPtrVec)
+
+struct Token {
+    TokenKind kind;
+    union {
+        Word word;
+        SpecialToken spec;
+        TokenPtrVec procsub_toks;
+    } as;
+};
+
+DECLARE_VEC(Token, TokenVec)
+
+typedef struct {
+    TokenVec token_pool;
+    TokenPtrVec top_tokens;
+} Ast;