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Previously, you could do \set variable operand1 operator operand2, but nothing more complicated. Now, you can \set variable expression, which makes it much simpler to do multi-step calculations here. This also adds support for the modulo operator (%), with the same semantics as in C. Robert Haas and Fabien Coelho, reviewed by Álvaro Herrera and Stephen Frost
97 lines
2.2 KiB
Plaintext
97 lines
2.2 KiB
Plaintext
%{
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/*-------------------------------------------------------------------------
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*
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* exprparse.y
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* bison grammar for a simple expression syntax
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*
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* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include "pgbench.h"
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PgBenchExpr *expr_parse_result;
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static PgBenchExpr *make_integer_constant(int64 ival);
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static PgBenchExpr *make_variable(char *varname);
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static PgBenchExpr *make_op(char operator, PgBenchExpr *lexpr,
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PgBenchExpr *rexpr);
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%}
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%expect 0
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%name-prefix="expr_yy"
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%union
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{
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int64 ival;
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char *str;
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PgBenchExpr *expr;
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}
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%type <expr> expr
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%type <ival> INTEGER
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%type <str> VARIABLE
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%token INTEGER VARIABLE
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%token CHAR_ERROR /* never used, will raise a syntax error */
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%left '+' '-'
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%left '*' '/' '%'
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%right UMINUS
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%%
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result: expr { expr_parse_result = $1; }
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expr: '(' expr ')' { $$ = $2; }
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| '+' expr %prec UMINUS { $$ = $2; }
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| '-' expr %prec UMINUS { $$ = make_op('-', make_integer_constant(0), $2); }
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| expr '+' expr { $$ = make_op('+', $1, $3); }
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| expr '-' expr { $$ = make_op('-', $1, $3); }
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| expr '*' expr { $$ = make_op('*', $1, $3); }
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| expr '/' expr { $$ = make_op('/', $1, $3); }
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| expr '%' expr { $$ = make_op('%', $1, $3); }
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| INTEGER { $$ = make_integer_constant($1); }
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| VARIABLE { $$ = make_variable($1); }
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;
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%%
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static PgBenchExpr *
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make_integer_constant(int64 ival)
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{
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PgBenchExpr *expr = pg_malloc(sizeof(PgBenchExpr));
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expr->etype = ENODE_INTEGER_CONSTANT;
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expr->u.integer_constant.ival = ival;
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return expr;
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}
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static PgBenchExpr *
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make_variable(char *varname)
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{
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PgBenchExpr *expr = pg_malloc(sizeof(PgBenchExpr));
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expr->etype = ENODE_VARIABLE;
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expr->u.variable.varname = varname;
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return expr;
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}
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static PgBenchExpr *
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make_op(char operator, PgBenchExpr *lexpr, PgBenchExpr *rexpr)
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{
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PgBenchExpr *expr = pg_malloc(sizeof(PgBenchExpr));
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expr->etype = ENODE_OPERATOR;
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expr->u.operator.operator = operator;
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expr->u.operator.lexpr = lexpr;
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expr->u.operator.rexpr = rexpr;
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return expr;
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}
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#include "exprscan.c"
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