Initial revision

src/cmd/sam/parse.h

@@ -0,0 +1,68 @@
+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
+
+extern 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 */
+}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*);