1 files changed, 194 insertions, 0 deletions
diff --git a/src/syntax.h b/src/syntax.h
new file mode 100644
index 0000000..0cdb76c
--- /dev/null
+++ b/src/syntax.h
@@ -0,0 +1,194 @@
+# pragma once
+
+#include "../src/utils.h"
+
+
+// Stage 1
+
+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;
+        IntVec open_fds;
+        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,
+} TokenKind;
+
+typedef enum {
+    OP_PIPE,
+    OP_REDIR_W_TRUNC,
+    OP_REDIR_W_APPEND,
+    OP_REDIR_R,
+    OP_EOL,
+} OperatorToken;
+
+
+typedef enum {
+    SPEC_OP,
+    SPEC_SUB_IN,
+    SPEC_SUB_OUT,
+} SpecialTokenKind;
+
+typedef struct {
+    SpecialTokenKind kind;
+    union {
+        OperatorToken op;
+        void* proc_sub_region;
+    } as;
+} SpecialToken;
+
+
+typedef struct Token Token;
+DECLARE_VEC(Token*, TokenPtrVec)
+
+struct Token {
+    TokenKind kind;
+    union {
+        Word word;
+        SpecialToken spec;
+    } as;
+};
+
+DECLARE_VEC(Token, TokenVec)
+DECLARE_VEC(TokenVec, TokenVecVec)
+
+typedef struct {
+    TokenVecVec region_pool;
+    TokenVec* root;
+} Ast;
+
+
+
+// Stage 2
+
+
+typedef enum {
+    REDIR_WRITE_TRUNC,
+    REDIR_WRITE_APPEND,
+    REDIR_READ,
+    REDIR_FDS,
+} RedirectKind;
+
+typedef struct {
+    RedirectKind kind;
+    union {
+        char* filename;
+        struct{int from; int to;} fds; 
+    } as;
+} Redirect;
+
+DECLARE_VEC(Redirect, RedirectVec)
+
+typedef struct PlCommand PlCommand;
+
+typedef enum {
+    ARG_PS_IN,
+    ARG_PS_OUT,
+    ARG_LIT,
+} ArgKind;
+
+typedef struct {
+    ArgKind kind;
+    union {
+        char* lit_str;
+        void* sub_pipeline;
+    } as;
+} Arg;
+
+DECLARE_VEC(Arg, ArgVec)
+
+
+typedef enum {
+    CONN_PIPE,
+    CONN_EOL,
+} Connector;
+
+
+struct PlCommand {
+    ArgVec args;
+    RedirectVec redirects;
+    Connector conn;
+};
+
+DECLARE_VEC(PlCommand, Pipeline)
+DECLARE_VEC(Pipeline, PipelineVec)
+
+typedef struct {
+    PipelineVec pl_pool;
+    Pipeline* root;
+} PipelineTree;
+
+
+
+// Stage 3
+
+typedef struct {
+    int redirected;
+    int to;
+} FdRedirect;
+
+DECLARE_VEC(FdRedirect, FdRedirectVec)
+
+typedef struct {
+    char** args;
+    FdRedirectVec redirects;
+    int stdin_fd, stdout_fd;
+    IntVec open_fds;
+} ExecutableCommand;