611 lines
20 KiB
C
611 lines
20 KiB
C
/* Driver template for the LEMON parser generator.
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** The author disclaims copyright to this source code.
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*/
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/* First off, code is include which follows the "include" declaration
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** in the input file. */
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#include <stdio.h>
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%%
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/* Next is all token values, in a form suitable for use by makeheaders.
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** This section will be null unless lemon is run with the -m switch.
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*/
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/*
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** These constants (all generated automatically by the parser generator)
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** specify the various kinds of tokens (terminals) that the parser
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** understands.
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**
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** Each symbol here is a terminal symbol in the grammar.
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*/
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%%
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/* Make sure the INTERFACE macro is defined.
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*/
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#ifndef INTERFACE
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# define INTERFACE 1
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#endif
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/* The next thing included is series of defines which control
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** various aspects of the generated parser.
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** YYCODETYPE is the data type used for storing terminal
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** and nonterminal numbers. "unsigned char" is
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** used if there are fewer than 250 terminals
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** and nonterminals. "int" is used otherwise.
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** YYNOCODE is a number of type YYCODETYPE which corresponds
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** to no legal terminal or nonterminal number. This
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** number is used to fill in empty slots of the hash
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** table.
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** YYACTIONTYPE is the data type used for storing terminal
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** and nonterminal numbers. "unsigned char" is
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** used if there are fewer than 250 rules and
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** states combined. "int" is used otherwise.
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** ParseTOKENTYPE is the data type used for minor tokens given
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** directly to the parser from the tokenizer.
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** YYMINORTYPE is the data type used for all minor tokens.
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** This is typically a union of many types, one of
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** which is ParseTOKENTYPE. The entry in the union
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** for base tokens is called "yy0".
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** YYSTACKDEPTH is the maximum depth of the parser's stack.
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** ParseARG_SDECL A static variable declaration for the %extra_argument
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** ParseARG_PDECL A parameter declaration for the %extra_argument
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** ParseARG_STORE Code to store %extra_argument into yypParser
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** ParseARG_FETCH Code to extract %extra_argument from yypParser
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** YYNSTATE the combined number of states.
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** YYNRULE the number of rules in the grammar
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** YYERRORSYMBOL is the code number of the error symbol. If not
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** defined, then do no error processing.
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*/
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%%
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#define YY_NO_ACTION (YYNSTATE+YYNRULE+2)
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#define YY_ACCEPT_ACTION (YYNSTATE+YYNRULE+1)
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#define YY_ERROR_ACTION (YYNSTATE+YYNRULE)
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/* Next is the action table. Each entry in this table contains
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**
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** + An integer which is the number representing the look-ahead
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** token
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**
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** + An integer indicating what action to take. Number (N) between
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** 0 and YYNSTATE-1 mean shift the look-ahead and go to state N.
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** Numbers between YYNSTATE and YYNSTATE+YYNRULE-1 mean reduce by
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** rule N-YYNSTATE. Number YYNSTATE+YYNRULE means that a syntax
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** error has occurred. Number YYNSTATE+YYNRULE+1 means the parser
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** accepts its input.
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**
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** + A pointer to the next entry with the same hash value.
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**
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** The action table is really a series of hash tables. Each hash
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** table contains a number of entries which is a power of two. The
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** "state" table (which follows) contains information about the starting
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** point and size of each hash table.
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*/
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struct yyActionEntry {
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YYCODETYPE lookahead; /* The value of the look-ahead token */
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YYCODETYPE next; /* Next entry + 1. Zero at end of collision chain */
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YYACTIONTYPE action; /* Action to take for this look-ahead */
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};
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typedef struct yyActionEntry yyActionEntry;
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static const yyActionEntry yyActionTable[] = {
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%%
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};
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/* The state table contains information needed to look up the correct
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** action in the action table, given the current state of the parser.
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** Information needed includes:
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**
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** + A pointer to the start of the action hash table in yyActionTable.
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**
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** + The number of entries in the action hash table.
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**
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** + The default action. This is the action to take if no entry for
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** the given look-ahead is found in the action hash table.
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*/
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struct yyStateEntry {
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const yyActionEntry *hashtbl; /* Start of the hash table in yyActionTable */
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YYCODETYPE nEntry; /* Number of entries in action hash table */
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YYACTIONTYPE actionDefault; /* Default action if look-ahead not found */
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};
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typedef struct yyStateEntry yyStateEntry;
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static const yyStateEntry yyStateTable[] = {
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%%
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};
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/* The following structure represents a single element of the
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** parser's stack. Information stored includes:
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**
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** + The state number for the parser at this level of the stack.
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**
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** + The value of the token stored at this level of the stack.
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** (In other words, the "major" token.)
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**
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** + The semantic value stored at this level of the stack. This is
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** the information used by the action routines in the grammar.
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** It is sometimes called the "minor" token.
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*/
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struct yyStackEntry {
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int stateno; /* The state-number */
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int major; /* The major token value. This is the code
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** number for the token at this stack level */
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YYMINORTYPE minor; /* The user-supplied minor token value. This
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** is the value of the token */
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};
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typedef struct yyStackEntry yyStackEntry;
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/* The state of the parser is completely contained in an instance of
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** the following structure */
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struct yyParser {
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int yyidx; /* Index of top element in stack */
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int yyerrcnt; /* Shifts left before out of the error */
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yyStackEntry *yytop; /* Pointer to the top stack element */
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ParseARG_SDECL /* A place to hold %extra_argument */
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yyStackEntry yystack[YYSTACKDEPTH]; /* The parser's stack */
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};
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typedef struct yyParser yyParser;
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#ifndef NDEBUG
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#include <stdio.h>
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static FILE *yyTraceFILE = 0;
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static char *yyTracePrompt = 0;
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/*
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** Turn parser tracing on by giving a stream to which to write the trace
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** and a prompt to preface each trace message. Tracing is turned off
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** by making either argument NULL
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**
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** Inputs:
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** <ul>
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** <li> A FILE* to which trace output should be written.
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** If NULL, then tracing is turned off.
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** <li> A prefix string written at the beginning of every
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** line of trace output. If NULL, then tracing is
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** turned off.
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** </ul>
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**
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** Outputs:
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** None.
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*/
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void ParseTrace(FILE *TraceFILE, char *zTracePrompt){
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yyTraceFILE = TraceFILE;
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yyTracePrompt = zTracePrompt;
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if( yyTraceFILE==0 ) yyTracePrompt = 0;
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else if( yyTracePrompt==0 ) yyTraceFILE = 0;
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}
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/* For tracing shifts, the names of all terminals and nonterminals
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** are required. The following table supplies these names */
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static const char *yyTokenName[] = {
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%%
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};
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#define YYTRACE(X) if( yyTraceFILE ) fprintf(yyTraceFILE,"%sReduce [%s].\n",yyTracePrompt,X);
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#else
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#define YYTRACE(X)
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#endif
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/*
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** This function returns the symbolic name associated with a token
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** value.
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*/
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const char *ParseTokenName(int tokenType){
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#ifndef NDEBUG
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if( tokenType>0 && tokenType<(sizeof(yyTokenName)/sizeof(yyTokenName[0])) ){
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return yyTokenName[tokenType];
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}else{
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return "Unknown";
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}
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#else
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return "";
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#endif
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}
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/*
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** This function allocates a new parser.
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** The only argument is a pointer to a function which works like
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** malloc.
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**
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** Inputs:
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** A pointer to the function used to allocate memory.
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**
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** Outputs:
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** A pointer to a parser. This pointer is used in subsequent calls
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** to Parse and ParseFree.
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*/
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void *ParseAlloc(void *(*mallocProc)(size_t)){
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yyParser *pParser;
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pParser = (yyParser*)(*mallocProc)( (size_t)sizeof(yyParser) );
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if( pParser ){
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pParser->yyidx = -1;
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}
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return pParser;
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}
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/* The following function deletes the value associated with a
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** symbol. The symbol can be either a terminal or nonterminal.
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** "yymajor" is the symbol code, and "yypminor" is a pointer to
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** the value.
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*/
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static void yy_destructor(YYCODETYPE yymajor, YYMINORTYPE *yypminor){
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switch( yymajor ){
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/* Here is inserted the actions which take place when a
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** terminal or non-terminal is destroyed. This can happen
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** when the symbol is popped from the stack during a
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** reduce or during error processing or when a parser is
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** being destroyed before it is finished parsing.
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**
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** Note: during a reduce, the only symbols destroyed are those
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** which appear on the RHS of the rule, but which are not used
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** inside the C code.
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*/
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%%
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default: break; /* If no destructor action specified: do nothing */
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}
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}
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/*
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** Pop the parser's stack once.
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**
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** If there is a destructor routine associated with the token which
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** is popped from the stack, then call it.
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**
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** Return the major token number for the symbol popped.
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*/
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static int yy_pop_parser_stack(yyParser *pParser){
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YYCODETYPE yymajor;
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if( pParser->yyidx<0 ) return 0;
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#ifndef NDEBUG
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if( yyTraceFILE && pParser->yyidx>=0 ){
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fprintf(yyTraceFILE,"%sPopping %s\n",
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yyTracePrompt,
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yyTokenName[pParser->yytop->major]);
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}
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#endif
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yymajor = pParser->yytop->major;
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yy_destructor( yymajor, &pParser->yytop->minor);
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pParser->yyidx--;
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pParser->yytop--;
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return yymajor;
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}
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/*
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** Deallocate and destroy a parser. Destructors are all called for
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** all stack elements before shutting the parser down.
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**
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** Inputs:
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** <ul>
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** <li> A pointer to the parser. This should be a pointer
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** obtained from ParseAlloc.
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** <li> A pointer to a function used to reclaim memory obtained
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** from malloc.
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** </ul>
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*/
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void ParseFree(
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void *p, /* The parser to be deleted */
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void (*freeProc)(void*) /* Function used to reclaim memory */
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){
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yyParser *pParser = (yyParser*)p;
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if( pParser==0 ) return;
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while( pParser->yyidx>=0 ) yy_pop_parser_stack(pParser);
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(*freeProc)((void*)pParser);
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}
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/*
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** Find the appropriate action for a parser given the look-ahead token.
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**
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** If the look-ahead token is YYNOCODE, then check to see if the action is
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** independent of the look-ahead. If it is, return the action, otherwise
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** return YY_NO_ACTION.
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*/
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static int yy_find_parser_action(
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yyParser *pParser, /* The parser */
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int iLookAhead /* The look-ahead token */
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){
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const yyStateEntry *pState; /* Appropriate entry in the state table */
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const yyActionEntry *pAction; /* Action appropriate for the look-ahead */
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/* if( pParser->yyidx<0 ) return YY_NO_ACTION; */
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pState = &yyStateTable[pParser->yytop->stateno];
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if( pState->nEntry==0 ){
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return pState->actionDefault;
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}else if( iLookAhead!=YYNOCODE ){
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pAction = &pState->hashtbl[iLookAhead % pState->nEntry];
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while( 1 ){
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if( pAction->lookahead==iLookAhead ) return pAction->action;
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if( pAction->next==0 ) return pState->actionDefault;
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pAction = &pState->hashtbl[pAction->next-1];
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}
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}else if( pState->hashtbl->lookahead!=YYNOCODE ){
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return YY_NO_ACTION;
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}
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return pState->actionDefault;
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}
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/*
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** Perform a shift action.
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*/
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static void yy_shift(
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yyParser *yypParser, /* The parser to be shifted */
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int yyNewState, /* The new state to shift in */
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int yyMajor, /* The major token to shift in */
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YYMINORTYPE *yypMinor /* Pointer ot the minor token to shift in */
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){
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yypParser->yyidx++;
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yypParser->yytop++;
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if( yypParser->yyidx>=YYSTACKDEPTH ){
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ParseARG_FETCH;
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yypParser->yyidx--;
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yypParser->yytop--;
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#ifndef NDEBUG
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if( yyTraceFILE ){
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fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
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}
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#endif
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while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will execute if the parser
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** stack every overflows */
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%%
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ParseARG_STORE; /* Suppress warning about unused %extra_argument var */
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return;
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}
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yypParser->yytop->stateno = yyNewState;
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yypParser->yytop->major = yyMajor;
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yypParser->yytop->minor = *yypMinor;
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#ifndef NDEBUG
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if( yyTraceFILE && yypParser->yyidx>0 ){
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int i;
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fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
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fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
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for(i=1; i<=yypParser->yyidx; i++)
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fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
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fprintf(yyTraceFILE,"\n");
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}
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#endif
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}
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/* The following table contains information about every rule that
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** is used during the reduce.
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*/
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static struct {
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YYCODETYPE lhs; /* Symbol on the left-hand side of the rule */
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unsigned char nrhs; /* Number of right-hand side symbols in the rule */
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} yyRuleInfo[] = {
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%%
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};
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static void yy_accept(yyParser*); /* Forward Declaration */
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/*
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** Perform a reduce action and the shift that must immediately
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** follow the reduce.
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*/
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static void yy_reduce(
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yyParser *yypParser, /* The parser */
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int yyruleno /* Number of the rule by which to reduce */
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){
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int yygoto; /* The next state */
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int yyact; /* The next action */
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YYMINORTYPE yygotominor; /* The LHS of the rule reduced */
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yyStackEntry *yymsp; /* The top of the parser's stack */
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int yysize; /* Amount to pop the stack */
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ParseARG_FETCH;
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yymsp = yypParser->yytop;
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switch( yyruleno ){
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/* Beginning here are the reduction cases. A typical example
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** follows:
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** case 0:
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** YYTRACE("<text of the rule>");
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** #line <lineno> <grammarfile>
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** { ... } // User supplied code
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** #line <lineno> <thisfile>
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** break;
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*/
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%%
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};
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yygoto = yyRuleInfo[yyruleno].lhs;
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yysize = yyRuleInfo[yyruleno].nrhs;
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yypParser->yyidx -= yysize;
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yypParser->yytop -= yysize;
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yyact = yy_find_parser_action(yypParser,yygoto);
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if( yyact < YYNSTATE ){
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yy_shift(yypParser,yyact,yygoto,&yygotominor);
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}else if( yyact == YYNSTATE + YYNRULE + 1 ){
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yy_accept(yypParser);
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}
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}
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/*
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** The following code executes when the parse fails
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*/
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static void yy_parse_failed(
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yyParser *yypParser /* The parser */
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){
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ParseARG_FETCH;
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#ifndef NDEBUG
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if( yyTraceFILE ){
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fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
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}
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#endif
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while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will be executed whenever the
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** parser fails */
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%%
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ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
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}
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/*
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** The following code executes when a syntax error first occurs.
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*/
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static void yy_syntax_error(
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yyParser *yypParser, /* The parser */
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int yymajor, /* The major type of the error token */
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YYMINORTYPE yyminor /* The minor type of the error token */
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){
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ParseARG_FETCH;
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#define TOKEN (yyminor.yy0)
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%%
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ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
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}
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/*
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** The following is executed when the parser accepts
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*/
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static void yy_accept(
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yyParser *yypParser /* The parser */
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){
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ParseARG_FETCH;
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#ifndef NDEBUG
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if( yyTraceFILE ){
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fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
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}
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#endif
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while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will be executed whenever the
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** parser accepts */
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%%
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ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
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}
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/* The main parser program.
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** The first argument is a pointer to a structure obtained from
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** "ParseAlloc" which describes the current state of the parser.
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** The second argument is the major token number. The third is
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** the minor token. The fourth optional argument is whatever the
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** user wants (and specified in the grammar) and is available for
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** use by the action routines.
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**
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** Inputs:
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** <ul>
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** <li> A pointer to the parser (an opaque structure.)
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** <li> The major token number.
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** <li> The minor token number.
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** <li> An option argument of a grammar-specified type.
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** </ul>
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**
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** Outputs:
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** None.
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*/
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void Parse(
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void *yyp, /* The parser */
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int yymajor, /* The major token code number */
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ParseTOKENTYPE yyminor /* The value for the token */
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ParseARG_PDECL /* Optional %extra_argument parameter */
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){
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YYMINORTYPE yyminorunion;
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int yyact; /* The parser action. */
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int yyendofinput; /* True if we are at the end of input */
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int yyerrorhit = 0; /* True if yymajor has invoked an error */
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yyParser *yypParser; /* The parser */
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/* (re)initialize the parser, if necessary */
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yypParser = (yyParser*)yyp;
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if( yypParser->yyidx<0 ){
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if( yymajor==0 ) return;
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yypParser->yyidx = 0;
|
|
yypParser->yyerrcnt = -1;
|
|
yypParser->yytop = &yypParser->yystack[0];
|
|
yypParser->yytop->stateno = 0;
|
|
yypParser->yytop->major = 0;
|
|
}
|
|
yyminorunion.yy0 = yyminor;
|
|
yyendofinput = (yymajor==0);
|
|
ParseARG_STORE;
|
|
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sInput %s\n",yyTracePrompt,yyTokenName[yymajor]);
|
|
}
|
|
#endif
|
|
|
|
do{
|
|
yyact = yy_find_parser_action(yypParser,yymajor);
|
|
if( yyact<YYNSTATE ){
|
|
yy_shift(yypParser,yyact,yymajor,&yyminorunion);
|
|
yypParser->yyerrcnt--;
|
|
if( yyendofinput && yypParser->yyidx>=0 ){
|
|
yymajor = 0;
|
|
}else{
|
|
yymajor = YYNOCODE;
|
|
}
|
|
}else if( yyact < YYNSTATE + YYNRULE ){
|
|
yy_reduce(yypParser,yyact-YYNSTATE);
|
|
}else if( yyact == YY_ERROR_ACTION ){
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sSyntax Error!\n",yyTracePrompt);
|
|
}
|
|
#endif
|
|
#ifdef YYERRORSYMBOL
|
|
/* A syntax error has occurred.
|
|
** The response to an error depends upon whether or not the
|
|
** grammar defines an error token "ERROR".
|
|
**
|
|
** This is what we do if the grammar does define ERROR:
|
|
**
|
|
** * Call the %syntax_error function.
|
|
**
|
|
** * Begin popping the stack until we enter a state where
|
|
** it is legal to shift the error symbol, then shift
|
|
** the error symbol.
|
|
**
|
|
** * Set the error count to three.
|
|
**
|
|
** * Begin accepting and shifting new tokens. No new error
|
|
** processing will occur until three tokens have been
|
|
** shifted successfully.
|
|
**
|
|
*/
|
|
if( yypParser->yyerrcnt<0 ){
|
|
yy_syntax_error(yypParser,yymajor,yyminorunion);
|
|
}
|
|
if( yypParser->yytop->major==YYERRORSYMBOL || yyerrorhit ){
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sDiscard input token %s\n",
|
|
yyTracePrompt,yyTokenName[yymajor]);
|
|
}
|
|
#endif
|
|
yy_destructor(yymajor,&yyminorunion);
|
|
yymajor = YYNOCODE;
|
|
}else{
|
|
while(
|
|
yypParser->yyidx >= 0 &&
|
|
yypParser->yytop->major != YYERRORSYMBOL &&
|
|
(yyact = yy_find_parser_action(yypParser,YYERRORSYMBOL)) >= YYNSTATE
|
|
){
|
|
yy_pop_parser_stack(yypParser);
|
|
}
|
|
if( yypParser->yyidx < 0 || yymajor==0 ){
|
|
yy_destructor(yymajor,&yyminorunion);
|
|
yy_parse_failed(yypParser);
|
|
yymajor = YYNOCODE;
|
|
}else if( yypParser->yytop->major!=YYERRORSYMBOL ){
|
|
YYMINORTYPE u2;
|
|
u2.YYERRSYMDT = 0;
|
|
yy_shift(yypParser,yyact,YYERRORSYMBOL,&u2);
|
|
}
|
|
}
|
|
yypParser->yyerrcnt = 3;
|
|
yyerrorhit = 1;
|
|
#else /* YYERRORSYMBOL is not defined */
|
|
/* This is what we do if the grammar does not define ERROR:
|
|
**
|
|
** * Report an error message, and throw away the input token.
|
|
**
|
|
** * If the input token is $, then fail the parse.
|
|
**
|
|
** As before, subsequent error messages are suppressed until
|
|
** three input tokens have been successfully shifted.
|
|
*/
|
|
if( yypParser->yyerrcnt<=0 ){
|
|
yy_syntax_error(yypParser,yymajor,yyminorunion);
|
|
}
|
|
yypParser->yyerrcnt = 3;
|
|
yy_destructor(yymajor,&yyminorunion);
|
|
if( yyendofinput ){
|
|
yy_parse_failed(yypParser);
|
|
}
|
|
yymajor = YYNOCODE;
|
|
#endif
|
|
}else{
|
|
yy_accept(yypParser);
|
|
yymajor = YYNOCODE;
|
|
}
|
|
}while( yymajor!=YYNOCODE && yypParser->yyidx>=0 );
|
|
return;
|
|
}
|