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#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#define DECLARE_VEC(T, Name) \
typedef struct { \
T* items; \
size_t count; \
size_t cap; \
size_t incr_step; \
} Name; \
static inline Name make_##Name(size_t step) { \
return (Name) { \
.items = malloc(step* sizeof(T)), \
.count = 0, \
.cap = step, \
.incr_step = step, \
}; \
} \
static inline void push_to_##Name(Name* vec, T item) { \
if (vec->count == vec->cap) { \
vec->cap += vec->incr_step; \
vec->items = realloc( \
vec->items, \
vec->cap * sizeof(T) \
); \
} \
vec->items[vec->count++] = item; \
} \
DECLARE_VEC(char, String);
void append_str_to_String(String* target, char* src_str) {
size_t required_size =
((target->count + strlen(src_str)) / target->incr_step + 1) * target->incr_step;
if (required_size > target->cap) {
target->cap = required_size;
target->items = realloc(target->items, required_size * sizeof(char));
}
memcpy(target->items + target->count, src_str, strlen(src_str));
target->count += strlen(src_str);
}
#define DECLARE_MAYBE(T) \
typedef struct { \
bool some; \
T value; \
} Maybe##T; \
typedef enum {
UN_Q,
SINGLE_Q,
DOUBLE_Q,
} QuotationMode;
typedef struct Region Region;
typedef enum {
LITERAL,
CMD_SUB,
ARITHM,
PARAM,
} ChunkKind;
typedef struct {
ChunkKind kind;
QuotationMode mode;
union {
char* lit_str;
Region* sub_cmd_region;
Region* arithm_expr_region;
Region* param_region;
} as;
} Chunk;
DECLARE_VEC(Chunk, ChunkVec)
typedef enum {
TOK_WORD,
TOK_SPECIAL,
} TokenKind;
typedef enum {
PIPE,
WRITE_REDIR_TRUNC,
WRITE_REDIR_APPEND,
READ_REDIR,
EOL,
} SpecialToken;
typedef struct {
TokenKind kind;
union {
ChunkVec word;
SpecialToken spec;
} as;
} Token;
DECLARE_VEC(Token, TokenVec)
DECLARE_MAYBE(SpecialToken)
struct Region {
QuotationMode mode;
TokenVec tokens;
};
DECLARE_MAYBE(Chunk);
MaybeChunk unquoted_next_chunk(char* input, size_t* pos) {
String chunk;
char curr_c;
for (;(curr_c = input[*pos], curr_c != '$' && curr_c != '\'' && curr_c != '\"' && curr_c != '\0'); pos++) {
exit(1);
}
exit(1);
}
TokenVec lex_region(char* input, size_t* pos, char until) {
TokenVec tokens = make_TokenVec(256);
while (input[*pos] != until) {
while (input[*pos] == ' ') (*pos)++;
}
return tokens;
}
TokenVec lex(char* input) {
size_t pos = 0;
return lex_region(input, &pos, '\0');
}
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