162 lines
2.3 KiB
Plaintext
162 lines
2.3 KiB
Plaintext
/* E X P R E S S I O N S */
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{
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static char *RcsId = "$Header$";
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#include <alloc.h>
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#include <em_arith.h>
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#include <em_label.h>
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#include "LLlex.h"
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#include "idf.h"
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#include "def.h"
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#include "scope.h"
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}
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number:
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INTEGER
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REAL
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;
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qualident(int types; struct def **pdf; char *str;)
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{
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int scope;
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int module;
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register struct def *df;
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struct def *lookfor();
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} :
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IDENT { if (types) {
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df = lookfor(dot.TOK_IDF, CurrentScope, 1);
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*pdf = df;
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if (df->df_kind == D_ERROR) types = 0;
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}
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}
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[
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{ if (types &&!(scope = has_selectors(df))) {
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types = 0;
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*pdf = ill_df;
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}
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}
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/* selector */
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'.' IDENT
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{ if (types) {
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module = (df->df_kind == D_MODULE);
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df = lookup(dot.TOK_IDF, scope);
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if (!df) {
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error("identifier \"%s\" not declared",
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dot.TOK_IDF->id_text);
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types = 0;
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df = ill_df;
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}
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else
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if (module &&
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!(df->df_flags&(D_EXPORTED|D_QEXPORTED))) {
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error("identifier \"%s\" not exported from qualifying module", dot.TOK_IDF->id_text);
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}
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}
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}
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]*
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{ if (types && !(types & df->df_kind)) {
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error("identifier \"%s\" is not a %s",
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df->df_idf->id_text, str);
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}
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}
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;
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selector:
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'.' /* field */ IDENT
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;
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ExpList:
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expression [ ',' expression ]*
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;
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ConstExpression:
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expression
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/*
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* Changed rule in new Modula-2.
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* Check that the expression is a constant expression and evaluate!
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*/
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;
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expression:
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SimpleExpression [ relation SimpleExpression ]?
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;
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relation:
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'=' | '#' | UNEQUAL | '<' | LESSEQUAL | '>' | GREATEREQUAL | IN
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;
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SimpleExpression:
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[ '+' | '-' ]? term [ AddOperator term ]*
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;
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AddOperator:
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'+' | '-' | OR
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;
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term:
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factor [ MulOperator factor ]*
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;
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MulOperator:
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'*' | '/' | DIV | MOD | AND | '&'
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;
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factor
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{
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struct def *df;
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} :
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qualident(0, &df, (char *) 0)
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[
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designator_tail? ActualParameters?
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bare_set
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]
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bare_set
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| %default
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number
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STRING
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'(' expression ')'
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NOT factor
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;
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bare_set:
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'{' [ element [ ',' element ]* ]? '}'
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;
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ActualParameters:
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'(' ExpList? ')'
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;
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element:
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expression [ UPTO expression ]?
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;
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designator
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{
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struct def *df;
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} :
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qualident(0, &df, (char *) 0)
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designator_tail?
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;
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designator_tail:
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visible_designator_tail
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[
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selector
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visible_designator_tail
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]*
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;
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visible_designator_tail:
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'[' ExpList ']'
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'^'
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;
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