1 files changed, 116 insertions, 0 deletions
diff --git a/src/preproc.h b/src/preproc.h
new file mode 100644
index 0000000..7907f9d
--- /dev/null
+++ b/src/preproc.h
@@ -0,0 +1,116 @@
+#pragma once
+
+#include "utils.h"
+
+typedef struct Region Region;
+
+
+// Lexing stage
+typedef enum {
+    UN_Q,
+    SINGLE_Q,
+    DOUBLE_Q,
+} QuotationMode;
+
+typedef enum {
+    LITERAL,
+    REGION_EXP,
+    VAR_EXP,    // TODO: Later include other exps
+} ChunkKind;
+
+typedef struct {
+    ChunkKind kind;
+    QuotationMode qmode;
+    union {
+        char* literal_str;
+        Region* reg_ptr;
+        char* varname;
+    } as;
+} Chunk;
+DECLARE_MAYBE(Chunk, MaybeChunk);
+DECLARE_VEC(Chunk*, Word)
+
+typedef enum {
+    TOK_WORD,
+    TOK_SPECIAL,
+    TOK_PROCSUB_IN,
+    TOK_PROCSUB_OUT,
+} TokenKind;
+
+typedef enum {
+    PIPE,
+    WRITE_REDIR_TRUNC,
+    WRITE_REDIR_APPEND,
+    READ_REDIR,
+    EOL,
+} SpecialToken;
+DECLARE_MAYBE(SpecialToken, MaybeSpecialToken)  
+
+typedef struct {
+    TokenKind kind;
+
+    union {
+        Word word;
+        SpecialToken spec; 
+        Region* procsub_region;
+    } as;
+} Token;
+
+
+DECLARE_VEC(Token*, TokenPtrVec)
+ 
+
+typedef enum {
+    CMDS,
+    ARITHM,
+} RegionMode;
+
+struct Region {
+    RegionMode mode;
+    TokenPtrVec tokens; 
+};
+DECLARE_VEC(Region, RegionVec)
+
+
+
+DECLARE_VEC(Chunk, ChunkVec)
+DECLARE_VEC(Token, TokenVec)
+
+
+
+// Lexing
+
+typedef struct {
+    RegionVec regions;
+    TokenVec tokens;
+    ChunkVec chunks;
+} PreprocArena;
+
+
+TokenPtrVec lex(char* input, PreprocArena* arena);
+
+
+// Parsing
+
+typedef enum {
+    CONN_PIPE,
+    CONN_EOL,
+    // TODO: add the |& thingy
+} Connector;
+
+DECLARE_MAYBE(Connector, MaybeConnector)
+
+typedef struct {
+    TokenVec cmd_toks;
+    Connector conn;
+} PipelineElement;
+
+DECLARE_VEC(PipelineElement, Pipeline)
+
+Pipeline parse_tokstream(Token* tokstream); 
+
+
+
+
+
+