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V0.8: add `elsif add some conditional directive syntax checks. 

This is a direct back port from the development branch. It adds
the `elsif directive and adds check that the conditional
directives are used correctly.
This commit is contained in:
Cary R 2007-12-28 20:22:42 -08:00 committed by Stephen Williams
parent 304a63d8e3
commit 3f16d3402a
1 changed files with 53 additions and 0 deletions
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53
ivlpp/lexor.lex
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@ -310,6 +310,23 @@ W [ \t\b\f]+
yy_push_state(IFDEF_SUPR);
}
<IFDEF_TRUE>`elsif{W}[a-zA-Z_][a-zA-Z0-9_$]* {
BEGIN(IFDEF_SUPR);
}
<IFDEF_FALSE>`elsif{W}[a-zA-Z_][a-zA-Z0-9_$]* {
char*name = strchr(yytext, '`');
assert(name);
name += 6;
name += strspn(name, " \t\b\f");
if (is_defined(name)) {
BEGIN(IFDEF_TRUE);
} else {
BEGIN(IFDEF_FALSE);
}
}
<IFDEF_SUPR>`elsif{W}[a-zA-Z_][a-zA-Z0-9_$]* { }
<IFDEF_TRUE>`else { BEGIN(IFDEF_FALSE); }
<IFDEF_FALSE>`else { BEGIN(IFDEF_TRUE); }
<IFDEF_SUPR>`else { }
@ -332,6 +349,42 @@ W [ \t\b\f]+
<IFDEF_FALSE,IFDEF_TRUE,IFDEF_SUPR>`endif { ifdef_leave(); yy_pop_state(); }
`ifdef {
fprintf(stderr, "%s:%u: `ifdef without a macro name - ignored.\n",
istack->path, istack->lineno+1);
error_count += 1;
}
`ifndef {
fprintf(stderr, "%s:%u: `ifndef without a macro name - ignored.\n",
istack->path, istack->lineno+1);
error_count += 1;
}
`elsif {
fprintf(stderr, "%s:%u: `elsif without a macro name - ignored.\n",
istack->path, istack->lineno+1);
error_count += 1;
}
`elsif{W}[a-zA-Z_][a-zA-Z0-9_$]* {
fprintf(stderr, "%s:%u: `elsif without a matching `ifdef - ignored.\n",
istack->path, istack->lineno+1);
error_count += 1;
}
`else {
fprintf(stderr, "%s:%u: `else without a matching `ifdef - ignored.\n",
istack->path, istack->lineno+1);
error_count += 1;
}
`endif {
fprintf(stderr, "%s:%u: `endif without a matching `ifdef - ignored.\n",
istack->path, istack->lineno+1);
error_count += 1;
}
/* This pattern notices macros and arranges for them to be replaced. */
`[a-zA-Z_][a-zA-Z0-9_$]* { def_match(); }