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basic scanner done

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overflowerror 2021-05-20 17:04:16 +02:00
commit c592ef5369
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whitespace [\n\t\r ]
params_begin "{$"
params_end "$}"
section "%%"
statement_begin "{%"
statement_end "%}"
output_begin "{{"
output_end "}}"
block_end "end"
type_prefixes "enum"|"struct"
type_prefix {type_prefixes}{whitespace}+
type_pointer {whitespace}*"*"
type {type_prefix}?[a-zA-Z0-9_]+{type_pointer}?
%option noyywrap
%option nodefault
%option nounput
%option noinput
%option yylineno
%x PARAMS
%x STATEMENT
%x OUTPUT
%x META_SECTION
%x MAIN_SECTION
%s META_SECTION
%%
%{
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
bool isMetaSection = true;
%}
<META_SECTION>{params_begin} { BEGIN(PARAMS); return PARAMS_BEGIN; }
<META_SECTION>{statement_begin} { BEGIN(STATEMENT); return STATEMENT_BEGIN; }
<META_SECTION>{section} { isMetaSection = false; BEGIN(MAIN_SECTION); }
<META_SECTION>{output_begin} { fprintf(stderr, "error: output block not allowed in meta section (line %d)\n", yylineno); exit(1); }
<META_SECTION>. { fprintf(stderr, "error: raw text not allowed in meta section (line %d)\n", yylineno); exit(1); }
<PARAMS>{type} { return TEXT; }
<PARAMS>{params_end} { BEGIN(META_SECTION); return PARAMS_END; }
<PARAMS>"," { return COMMA; }
<PARAMS>{whitespace}+ { /* ignore whitespaces */ }
<PARAMS>$ { return TEXT; /* catch $ as text */ }
<PARAMS>. { fprintf(stderr, "error: illegal token '%s' in parameter block (line %d)\n", yytext, yylineno); exit(1); }
<STATEMENT>[^%]+ { return TEXT; }
<STATEMENT>% { return TEXT; /* catch % as text */ }
<STATEMENT>{statement_end} { if (isMetaSection) BEGIN(META_SECTION); else BEGIN(MAIN_SECTION); return STATEMENT_END; }
<MAIN_SECTION>{params_begin} { fprintf(stderr, "warning: parameter block not allowed in main section (line %d); assuming to be text\n", yylineno); return TEXT; }
<MAIN_SECTION>{statement_begin} { BEGIN(STATEMENT); return STATEMENT_BEGIN; }
<MAIN_SECTION>{output_begin} { BEGIN(OUTPUT); return OUTPUT_BEGIN; }
<MAIN_SECTION>. { return TEXT; }
<OUTPUT>[^}]+ { return TEXT; }
<OUTPUT>{output_end} { BEGIN(MAIN_SECTION); return OUTPUT_END; }
<OUTPUT>"}" { return TEXT; /* catch } as text */ }