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ptucc_lex.l
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%{
#include "ptucc_parser.tab.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cgen.h"
int line_num = 1;
/*
A primitive macro facility:
just one macro is allowed to be defined!
*/
#define MAXMACRO 32
char* mactable[MAXMACRO][2];
int mactable_size = 0;
/* Return 1 on success, 0 on failure (macro table full) */
int set_macro(char* name, char* def);
/* Return def for macro, or NULL if no such macro is defined. */
char* get_macro(char* name);
%}
ID [a-zA-Z_][0-9a-zA-Z_]*
DIGIT [0-9]
DOT [\.]
SIGN_OPERATOR [\+\-]
EXP [eE]({SIGN_OPERATOR}?)([1-9]{DIGIT}*)
KEYWORD_AND [aA][nN][dD]
KEYWORD_ARRAY [aA][rR][rR][aA][yY]
KEYWORD_BOOLEAN [bB][oO][oO][lL][eE][aA][nN]
KEYWORD_CHAR [cC][hH][aA][rR]
KEYWORD_BEGIN [bB][eE][gG][iI][nN]
KEYWORD_DIV [dD][iI][vV]
KEYWORD_DO [dD][oO]
KEYWORD_ELSE [eE][lL][sS][eE]
KEYWORD_FOR [fF][oO][rR]
KEYWORD_END [eE][nN][dD]
KEYWORD_FUNCTION [fF][uU][nN][cC][tT][iI][oO][nN]
KEYWORD_GOTO [gG][oO][tT][oO]
KEYWORD_IF [iI][fF]
KEYWORD_INTEGER [iI][nN][tT][eE][gG][eE][rR]
KEYWORD_VAR [vV][aA][rR]
KEYWORD_MOD [mM][oO][dD]
KEYWORD_NOT [nN][oO][tT]
KEYWORD_OF [oO][fF]
KEYWORD_OR [oO][rR]
KEYWORD_WHILE [wW][hH][iI][lL][eE]
KEYWORD_PROCEDURE [pP][rR][oO][cC][eE][dD][uU][rR][eE]
KEYWORD_PROGRAM [pP][rR][oO][gG][rR][aA][mM]
KEYWORD_REAL [rR][eE][aA][lL]
KEYWORD_REPEAT [rR][eE][pP][eE][aA][tT]
KEYWORD_TO [tT][oO]
KEYWORD_RESULT [rR][eE][sS][uU][lL][tT]
KEYWORD_RETURN [rR][eE][tT][uU][rR][nN]
KEYWORD_THEN [tT][hH][eE][nN]
KEYWORD_UNTIL [uU][nN][tT][iI][lL]
KEYWORD_DOWNTO [dD][oO][wW][nN][tT][oO]
KEYWORD_TRUE [tT][rR][uU][eE]
KEYWORD_FALSE [fF][aA][lL][sS][eE]
READSTRING [Rr][Ee][Aa][Dd][Ss][Tt][Rr][iI][Nn][Gg]
READINTEGER [Rr][Ee][Aa][Dd][Ii][Nn][Tt][Ee][Gg][Ee][Rr]
READREAL [Rr][Ee][Aa][Dd][Rr][Ee][Aa][Ll]
WRITESTRING [Ww][Rr][Ii][Tt][Ee][Ss][Tt][Rr][Ii][Nn][Gg]
WRITEINTEGER [Ww][Rr][Ii][Tt][Ee][Ii][Nn][Tt][Ee][Gg][Ee][Rr]
WRITEREAL [Ww][Rr][Ii][Tt][Ee][Rr][Ee][Aa][Ll]
IDENTIFIER [a-zA-Z]([0-9a-zA-Z_])*
POSITIVEINT [0]|[1-9][0-9]*
POSITIVEREAL {POSITIVEINT}{DOT}{DIGIT}+{EXP}?
COMMON_CHARS [\`\~\!\@\#\$\%\^\&\*\(\)\_\{\}\[\]\:\;\|\?\/\<\>\,\.\-\+\=\ ]
ESCAPE_CHARS [\\n\\t\\r\\\\\'\\"]
CONSTANT_STRINGS1 [\']({COMMON_CHARS}|{ESCAPE_CHARS}|[A-Za-z])*[\']
CONSTANT_STRINGS2 [\"]({COMMON_CHARS}|{ESCAPE_CHARS}|[A-Za-z])*[\"]
CONSTANT_STRING ({CONSTANT_STRINGS1}|{CONSTANT_STRINGS2})
%x comment
%%
"(*" BEGIN(comment);
<comment>[^*\n]* /* eat anything that's not a '*' */
<comment>"*"+[^*)\n]* /* eat up '*'s not followed by ')'s */
<comment>\n ++line_num;
<comment>"*"+")" BEGIN(INITIAL);
\n {++line_num;}
{KEYWORD_AND} { return TK_AND;}
{KEYWORD_ARRAY} { return TK_ARRAY;}
{KEYWORD_BOOLEAN} { return TK_BOOLEAN;}
{KEYWORD_CHAR} { return TK_CHAR;}
{KEYWORD_BEGIN} { return TK_BEGIN;}
{KEYWORD_DIV} { return TK_DIV;}
{KEYWORD_DO} { return TK_DO;}
{KEYWORD_ELSE} { return TK_ELSE;}
{KEYWORD_FOR} { return TK_FOR;}
{KEYWORD_END} { return TK_END;}
{KEYWORD_FUNCTION} { return TK_FUNCTION;}
{KEYWORD_GOTO} { return TK_GOTO;}
{KEYWORD_IF} { return TK_IF;}
{KEYWORD_INTEGER} { return TK_INTEGER;}
{KEYWORD_VAR} { return TK_VAR;}
{KEYWORD_MOD} { return TK_MOD;}
{KEYWORD_NOT} { return TK_NOT;}
{KEYWORD_OF} { return TK_OF;}
{KEYWORD_OR} { return TK_OR;}
{KEYWORD_WHILE} { return TK_WHILE;}
{KEYWORD_PROCEDURE} { return TK_PROCEDURE;}
{KEYWORD_PROGRAM} { return TK_PROGRAM;}
{KEYWORD_REAL} { return TK_REAL;}
{KEYWORD_REPEAT} { return TK_REPEAT;}
{KEYWORD_TO} {return TK_TO;}
{KEYWORD_RESULT} {return TK_RESULT;}
{KEYWORD_RETURN} { return TK_RETURN;}
{KEYWORD_THEN} {return TK_THEN;}
{KEYWORD_UNTIL} { return TK_UNTIL;}
{KEYWORD_DOWNTO} { return TK_DOWNTO;}
{KEYWORD_TRUE} { return TK_TRUE;}
{KEYWORD_FALSE} { return TK_FALSE;}
{READSTRING} { return TK_READSTRING;}
{READINTEGER} { return TK_READINTEGER;}
{READREAL} { return TK_READREAL;}
{WRITESTRING} { return TK_WRITESTRING; }
{WRITEINTEGER} { return TK_WRITEINTEGER; }
{WRITEREAL} { return TK_WRITEREAL; }
{IDENTIFIER} { yylval.crepr = strdup(yytext); return TK_IDENTIFIER;}
{POSITIVEINT} { yylval.crepr = strdup(yytext); return TK_POSITIVEINT;}
{POSITIVEREAL} { yylval.crepr = strdup(yytext); return TK_POSITIVEREAL;}
{CONSTANT_STRING} { yylval.crepr = strdup(yytext); return TK_CONSTANT_STRING;}
"+" {return OP_PLUS;}
"-" { return OP_MINUS;}
"*" { return OP_MULT;}
"/" { return OP_DIV;}
"=" { return OP_EQUAL;}
"<>" { return OP_NOTEQUAL;}
"<" { return OP_LESS;}
">" { return OP_GREATER;}
"<=" { return OP_LESSEQUAL;}
">=" { return OP_GREATEREQUAL;}
"&&" { return OP_AND;}
"||" { return OP_OR;}
"!" { return OP_NOT;}
":=" { return ASSIGNMENT;}
";" { return SEMICOLON;}
"(" { return LEFT_PARENTHESIS;}
")" { return RIGHT_PARENTHESIS;}
"," { return TK_COMMA;}
"[" { return LEFT_BRACKET;}
"]" { return RIGHT_BRACKET;}
":" { return COLON;}
"." { return DOT;}
[ \r\n\t] /* skip whitespace */
%%