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delimiter keyword string identifier number block
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punctuation and operators keywords quoted strings variable and function names numeric constant { or }
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The function that returns tokens from the source code for the Little C interpreter is called get_token ( ), and it is shown here:
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/* Get a token */ int get_token(void) { register char *temp; token_type = 0; tok = 0; temp = token; *temp = '\0'; /* skip over white space */ while(iswhite(*prog) && *prog) ++prog; if(*prog == '\r') { ++prog; ++prog; /* skip over white space */ while(iswhite(*prog) && *prog) ++prog; } if(*prog == '\0') { /* end of file */ *token = '\0'; tok = FINISHED; return (token_type = DELIMITER); } if(strchr("{}", *prog)) { /* block delimiters */ *temp = *prog; temp++; *temp = '\0'; prog++; return (token_type = BLOCK); } /* look for comments */ if(*prog == '/') if(*(prog+1) == '*') { /* is a comment */ prog += 2; do { /* find end of comment */
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Page 726 while(*prog != '*') prog++; prog++; } while (*prog != '/'); prog++; } if(strchr("!<>=", *prog)) { /* is or might be a relational operator */ switch(*prog) { case '=': if(*(prog+1) == '=') { prog++; prog++; *temp = EQ; temp++; *temp = EQ; temp++; *temp = '\0'; } break; case '!': if(*(prog+1) == '=') { prog++; prog++; *temp = NE; temp++; *temp = NE; temp++; *temp = '\0'; } break; case '<': if(*(prog+1) == '=') { prog++; prog++; *temp = LE; temp++; *temp = LE; } else { prog++; *temp = LT; } temp++; *temp = '\0'; break; case '>': if(*(prog+1) == '=') { prog++; prog++; *temp = GE; temp++; *temp = GE; } else { prog++; *temp = GT; } temp++;
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Page 727 *temp = '\0'; break; } if(*token) return (token_type = DELIMITER); } if(strchr("+-*^/%=;(),'", *prog)){ /* delimiter */ *temp = *prog; prog++; /* advance to next position */ temp++; *temp = '\0'; return (token_type = DELIMITER); } if(*prog=='"') { /* quoted string */ prog+--; while(*prog != ''''&& *prog != '\r') *temp++ = *prog++; if(*prog == '\r' ) sntx_err(SYNTAX); prog++; *temp = '\0'; return (token_type = STRING); } if(isdigit(*prog)) { /* number */ while(!isdelim(*prog)) *temp++ = *prog++; *temp = '\0'; return (token_type = NUMBER); } if(isalpha(*prog)) { /* var or command */ while(!isdelim(*prog)) *temp++ = *prog++; token_type = TEMP; } *temp = '\0'; /* see if a string is a command or a variable */ if(token_type==TEMP) { tok = look_up(token); /* convert to internal rep */ if(tok) token_type = KEYWORD; /* is a keyword */ else token_type = IDENTIFIER; } return token_type; }
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The get_token( ) function uses the following global data and enumeration types:
extern char *prog; /* current location in source code */ extern char *p_buf; /* points to start of program buffer */ extern char token[80]; /* string representation of token */ extern char token_type; /* contains type of token */ extern char tok; /* internal representation of token */ enum tok_types {DELIMITER, IDENTIFIER, NUMBER, KEYWORD, TEMP, STRING, BLOCK}; enum double_ops {LT=1, LE, GT, GE, EQ, NE}; /* These are the constants used to call sntx_err() when a syntax error occurs Add more if you like NOTE: SYNTAX is a generic error message used when nothing else seems appropriate */ enum error_msg {SYNTAX, UNBAL_PARENS, NO_EXP, EQUALS_EXPECTED, NOT_VAR, PARAM_ERR, SEMI_EXPECTED, UNBAL_BRACES, FUNC_UNDEF, TYPE_EXPECTED, NEST_FUNC, RET_NOCALL, PAREN_EXPECTED, WHILE_EXPECTED, QUOTE_EXPECTED, NOT_TEMP, TOO_MANY_LVARS, DIV_BY_ZERO};
The current location in the source code is pointed to by prog The p_buf pointer is unchanged by the interpreter and always points to the start of the program being interpreted The get_token( ) function begins by skipping over all white space, including carriage returns and linefeeds Since no C token (except for a quoted string or character constant) contains a space, spaces must be bypassed The get_token( ) function also skips over comments (Remember, only /* */ comments are accepted) Next, the string representation of each token is placed into token; its type (as defined by the tok_types enumeration) is put into token_type; and, if the token is a keyword, its internal representation is assigned to tok via the look_up( ) function (shown in the full parser listing that follows) The reason for the internal representation of keywords will be discussed later As you can see by looking at get_token( ), it converts C's two -character relational operators into their corresponding enumeration value Although not technically necessary, this step makes the parser easier to implement Finally, if the parser encounters a syntax error, it calls the function sntx_err( ) with an enumerated value that corresponds to the type of error found The sntx_err( ) function
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