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