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Current File : //usr/include/pgsql/server/parser/scanner.h

/*-------------------------------------------------------------------------
 *
 * scanner.h
 *		API for the core scanner (flex machine)
 *
 * The core scanner is also used by PL/pgsql, so we provide a public API
 * for it.  However, the rest of the backend is only expected to use the
 * higher-level API provided by parser.h.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/parser/scanner.h
 *
 *-------------------------------------------------------------------------
 */

#ifndef SCANNER_H
#define SCANNER_H

#include "parser/keywords.h"

/*
 * The scanner returns extra data about scanned tokens in this union type.
 * Note that this is a subset of the fields used in YYSTYPE of the bison
 * parsers built atop the scanner.
 */
typedef union core_YYSTYPE
{
	int			ival;			/* for integer literals */
	char	   *str;			/* for identifiers and non-integer literals */
	const char *keyword;		/* canonical spelling of keywords */
} core_YYSTYPE;

/*
 * We track token locations in terms of byte offsets from the start of the
 * source string, not the column number/line number representation that
 * bison uses by default.  Also, to minimize overhead we track only one
 * location (usually the first token location) for each construct, not
 * the beginning and ending locations as bison does by default.  It's
 * therefore sufficient to make YYLTYPE an int.
 */
#define YYLTYPE  int

/*
 * Another important component of the scanner's API is the token code numbers.
 * However, those are not defined in this file, because bison insists on
 * defining them for itself.  The token codes used by the core scanner are
 * the ASCII characters plus these:
 *	%token <str>	IDENT FCONST SCONST BCONST XCONST Op
 *	%token <ival>	ICONST PARAM
 *	%token			TYPECAST DOT_DOT COLON_EQUALS
 * The above token definitions *must* be the first ones declared in any
 * bison parser built atop this scanner, so that they will have consistent
 * numbers assigned to them (specifically, IDENT = 258 and so on).
 */

/*
 * The YY_EXTRA data that a flex scanner allows us to pass around.
 * Private state needed by the core scanner goes here.  Note that the actual
 * yy_extra struct may be larger and have this as its first component, thus
 * allowing the calling parser to keep some fields of its own in YY_EXTRA.
 */
typedef struct core_yy_extra_type
{
	/*
	 * The string the scanner is physically scanning.  We keep this mainly so
	 * that we can cheaply compute the offset of the current token (yytext).
	 */
	char	   *scanbuf;
	Size		scanbuflen;

	/*
	 * The keyword list to use.
	 */
	const ScanKeyword *keywords;
	int			num_keywords;

	/*
	 * literalbuf is used to accumulate literal values when multiple rules are
	 * needed to parse a single literal.  Call startlit() to reset buffer to
	 * empty, addlit() to add text.  NOTE: the string in literalbuf is NOT
	 * necessarily null-terminated, but there always IS room to add a trailing
	 * null at offset literallen.  We store a null only when we need it.
	 */
	char	   *literalbuf;		/* palloc'd expandable buffer */
	int			literallen;		/* actual current string length */
	int			literalalloc;	/* current allocated buffer size */

	int			xcdepth;		/* depth of nesting in slash-star comments */
	char	   *dolqstart;		/* current $foo$ quote start string */

	/* first part of UTF16 surrogate pair for Unicode escapes */
	int32		utf16_first_part;

	/* state variables for literal-lexing warnings */
	bool		warn_on_first_escape;
	bool		saw_non_ascii;
} core_yy_extra_type;

/*
 * The type of yyscanner is opaque outside scan.l.
 */
typedef void *core_yyscan_t;


/* Entry points in parser/scan.l */
extern core_yyscan_t scanner_init(const char *str,
			 core_yy_extra_type *yyext,
			 const ScanKeyword *keywords,
			 int num_keywords);
extern void scanner_finish(core_yyscan_t yyscanner);
extern int core_yylex(core_YYSTYPE *lvalp, YYLTYPE *llocp,
		   core_yyscan_t yyscanner);
extern int	scanner_errposition(int location, core_yyscan_t yyscanner);
extern void scanner_yyerror(const char *message, core_yyscan_t yyscanner);

#endif   /* SCANNER_H */

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ITAY HOD

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Case Studies

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CBS News

We have started to work with CBS News, bringing our ideas of character-driven storytelling to one of the most successful and biggest networks in the United States. Since beginning to work with them ratings have climbed and more importantly, audience engagement is through the ceiling.

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New York Times Television

We started New York Times Television in 1990 and it was the first paper to be brought into the world of TV. It quickly became one of the most successful non-fiction production companies in the United States. The series and documentaries we produced won many awards including multiple Emmys.

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The BBC

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For the past five years we have worked with Spectrum News to introduce and train their journalists on visual, character driven storytelling using smartphones helping to create a different kind of local news for their network of 24-Hour News Stations across the United States.

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The United Nations

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The Newark Star-Ledger

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Mcgraw Hill

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Voice of America

In 1990, we were approached by The Voice of America, the official broadcasting agency for the United States Government. When we met with VOA, they were only a short wave radio broadcaster, but working with them, we took them into television, launching VOA-TV.

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Michael on Media

Michael Rosenblum has been writing about the media since 1988. His work and ideas have appeared in The Guardian, The Huffington Post, Ilkeston Life and many other publications.

He has been blogging regularly for the past 35 years on this subject. Having taught media studies at Columbia University, NYU and now the University of Oxford, he is considered an expert on this subject.

Continue reading this post or look back at previous posts.

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