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qse/lib/sed/sed.h

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+/*
+ * $Id$
+ *
+   Copyright 2006-2009 Chung, Hyung-Hwan.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+ */
+
+#ifndef _QSE_LIB_SED_SED_H_
+#define _QSE_LIB_SED_SED_H_
+
+#include <qse/sed/sed.h>
+#include <qse/cmn/str.h>
+
+typedef qse_int_t qse_sed_line_t;
+typedef struct qse_sed_adr_t qse_sed_adr_t; 
+typedef struct qse_sed_cmd_t qse_sed_cmd_t;
+
+/** 
+ * The qse_sed_t type defines a stream editor 
+ */
+struct qse_sed_t
+{
+	QSE_DEFINE_COMMON_FIELDS (sed)
+
+	qse_sed_errnum_t errnum; /**< stores an error number */
+	int option;              /**< stores options */
+
+	/** source text pointers */
+	struct
+	{
+		const qse_char_t* ptr; /**< beginning of the source text */
+		const qse_char_t* end; /**< end of the source text */
+		const qse_char_t* cur; /**< current source text pointer */
+	} src;
+
+	/** temporary regular expression buffer */
+	qse_str_t rexbuf;
+
+	/** compiled commands */
+	struct
+	{
+		qse_sed_cmd_t* buf; /**< buffer holding compiled commands */
+		qse_sed_cmd_t* end; /**< end of the buffer */
+		qse_sed_cmd_t* cur; /**< points next to the last command */
+	} cmd;
+
+	/** a table storing labels seen */
+	qse_map_t labs; 
+
+	/** data structure to compile command groups */
+	struct
+	{
+		/** current level of command group nesting */
+		int level;
+		/** keeps track of the begining of nested command groups */
+		qse_sed_cmd_t* cmd[128];
+	} grp;
+
+	/** data for execution */
+	struct
+	{
+		/** data needed for output streams and files */
+		struct
+		{
+			qse_sed_io_fun_t fun; /**< an output handler */
+			qse_sed_io_arg_t arg; /**< output handling data */
+
+			qse_char_t buf[2048];
+			qse_size_t len;
+			int        eof;
+
+			/*****************************************************/
+			/* the following two fields are very tightly-coupled.
+			 * don't make any partial changes */
+			qse_map_t  files;
+			qse_sed_t* files_ext;
+			/*****************************************************/
+		} out;
+
+		/** data needed for input streams */
+		struct
+		{
+			qse_sed_io_fun_t fun; /**< an input handler */
+			qse_sed_io_arg_t arg; /**< input handling data */
+
+			qse_char_t xbuf[1]; /**< a read-ahead buffer */
+			int xbuf_len; /**< data length in the buffer */
+
+			qse_char_t buf[2048]; /**< input buffer */
+			qse_size_t len; /**< data length in the buffer */
+			qse_size_t pos; /**< current position in the buffer */
+			int        eof; /**< EOF indicator */
+
+			qse_str_t line; /**< pattern space */
+			qse_size_t num; /**< current line number */
+		} in;
+
+		/** text buffers */
+		struct
+		{
+			qse_lda_t appended;
+			qse_str_t read;
+			qse_str_t held;
+			qse_str_t subst;
+		} txt;
+
+		/** indicates if a successful substitution has been made 
+		 *  since the last read on the input stream. */
+		int subst_done;
+	} e;
+};
+
+struct qse_sed_adr_t
+{
+	enum
+	{
+		QSE_SED_ADR_NONE,  /* no address */
+		QSE_SED_ADR_DOL,   /* $ - last line */
+		QSE_SED_ADR_LINE,  /* specified line */
+		QSE_SED_ADR_REX,   /* lines matching regular expression */
+		QSE_SED_ADR_STEP   /* line steps - only in the second address */
+	} type;
+
+	union 
+	{
+		qse_sed_line_t line;
+		void*  rex;
+	} u;
+};
+
+struct qse_sed_cmd_t
+{
+	enum
+	{
+		QSE_SED_CMD_QUIT           = QSE_T('q'),
+		QSE_SED_CMD_QUIT_QUIET     = QSE_T('Q'),
+
+		QSE_SED_CMD_APPEND         = QSE_T('a'),
+		QSE_SED_CMD_INSERT         = QSE_T('i'),
+		QSE_SED_CMD_CHANGE         = QSE_T('c'),
+
+		QSE_SED_CMD_DELETE         = QSE_T('d'),
+		QSE_SED_CMD_DELETE_FIRSTLN = QSE_T('D'),
+
+		QSE_SED_CMD_PRINT_LNNUM    = QSE_T('='),
+		QSE_SED_CMD_PRINT          = QSE_T('p'),
+		QSE_SED_CMD_PRINT_FIRSTLN  = QSE_T('P'),
+		QSE_SED_CMD_PRINT_CLEARLY  = QSE_T('l'),
+
+		QSE_SED_CMD_HOLD           = QSE_T('h'),
+		QSE_SED_CMD_HOLD_APPEND    = QSE_T('H'),
+		QSE_SED_CMD_RELEASE        = QSE_T('g'),
+		QSE_SED_CMD_RELEASE_APPEND = QSE_T('G'),
+		QSE_SED_CMD_EXCHANGE       = QSE_T('x'), 
+
+		QSE_SED_CMD_NEXT           = QSE_T('n'),
+		QSE_SED_CMD_NEXT_APPEND    = QSE_T('N'),
+
+		QSE_SED_CMD_READ_FILE      = QSE_T('r'),
+		QSE_SED_CMD_READ_FILELN    = QSE_T('R'),
+		QSE_SED_CMD_WRITE_FILE     = QSE_T('w'),
+		QSE_SED_CMD_WRITE_FILELN   = QSE_T('W'),
+
+		QSE_SED_CMD_BRANCH         = QSE_T('b'), 
+		QSE_SED_CMD_BRANCH_COND    = QSE_T('t'),
+
+		QSE_SED_CMD_SUBSTITUTE     = QSE_T('s'),
+		QSE_SED_CMD_TRANSLATE      = QSE_T('y')
+
+	} type;
+
+	int negated;
+
+	qse_sed_adr_t a1; /* optional start address */
+	qse_sed_adr_t a2; /* optional end address */
+
+	union
+	{
+		/* text for the a, i, c commands */
+		qse_xstr_t text;  
+
+		/* file name for r, w, R, W */
+		qse_xstr_t file;
+
+		/* data for the s command */
+		struct
+		{
+			void* rex; /* regular expression */
+			qse_xstr_t rpl;  /* replacement */
+
+			/* flags */
+			qse_xstr_t file; /* file name for w */
+			unsigned short occ;
+			unsigned short g: 1; /* global */
+			unsigned short p: 1; /* print */
+			unsigned short i: 1; /* case insensitive */
+		} subst;
+
+		/* translation set for the y command */
+		qse_xstr_t transet;
+
+		/* branch target for b and t */
+		struct
+		{
+			qse_xstr_t label;
+			qse_sed_cmd_t* target;
+		} branch;
+	} u;	
+
+	struct
+	{
+		int a1_matched;
+		int c_ready;
+	} state;
+};
+
+#endif