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typedef struct Addr Addr;
typedef struct Cmd Cmd;
struct Addr
{
char type; /* # (char addr), l (line addr), / ? . $ + - , ; */
union{
String *re;
Addr *aleft; /* left side of , and ; */
} g;
Posn num;
Addr *next; /* or right side of , and ; */
};
#define are g.re
#define left g.aleft
struct Cmd
{
Addr *addr; /* address (range of text) */
String *re; /* regular expression for e.g. 'x' */
union{
Cmd *cmd; /* target of x, g, {, etc. */
String *text; /* text of a, c, i; rhs of s */
Addr *addr; /* address for m, t */
} g;
Cmd *next; /* pointer to next element in {} */
short num;
ushort flag; /* whatever */
ushort cmdc; /* command character; 'x' etc. */
};
#define ccmd g.cmd
#define ctext g.text
#define caddr g.addr
typedef struct Cmdtab Cmdtab;
struct Cmdtab {
ushort cmdc; /* command character */
uchar text; /* takes a textual argument? */
uchar regexp; /* takes a regular expression? */
uchar addr; /* takes an address (m or t)? */
uchar defcmd; /* default command; 0==>none */
uchar defaddr; /* default address */
uchar count; /* takes a count e.g. s2/// */
char *token; /* takes text terminated by one of these */
int (*fn)(File*, Cmd*); /* function to call with parse tree */
};
extern Cmdtab cmdtab[];
enum Defaddr{ /* default addresses */
aNo,
aDot,
aAll
};
int nl_cmd(File*, Cmd*), a_cmd(File*, Cmd*), b_cmd(File*, Cmd*);
int c_cmd(File*, Cmd*), cd_cmd(File*, Cmd*), d_cmd(File*, Cmd*);
int D_cmd(File*, Cmd*), e_cmd(File*, Cmd*);
int f_cmd(File*, Cmd*), g_cmd(File*, Cmd*), i_cmd(File*, Cmd*);
int k_cmd(File*, Cmd*), m_cmd(File*, Cmd*), n_cmd(File*, Cmd*);
int p_cmd(File*, Cmd*), q_cmd(File*, Cmd*);
int s_cmd(File*, Cmd*), u_cmd(File*, Cmd*), w_cmd(File*, Cmd*);
int x_cmd(File*, Cmd*), X_cmd(File*, Cmd*), plan9_cmd(File*, Cmd*);
int eq_cmd(File*, Cmd*);
String *getregexp(int);
Addr *newaddr(void);
Address address(Addr*, Address, int);
int cmdexec(File*, Cmd*);
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