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- /**
- * Copyright (c) 1985 Sun Microsystems, Inc.
- * Copyright (c) 1980 The Regents of the University of California.
- * Copyright (c) 1976 Board of Trustees of the University of Illinois.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted provided
- * that the above copyright notice and this paragraph are duplicated in all
- * such forms and that any documentation, advertising materials, and other
- * materials related to such distribution and use acknowledge that the
- * software was developed by the University of California, Berkeley, the
- * University of Illinois, Urbana, and Sun Microsystems, Inc. The name of
- * either University or Sun Microsystems may not be used to endorse or
- * promote products derived from this software without specific prior written
- * permission. THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES
- * OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #include "globals.h"
- #include "codes.h"
-
- #ifndef lint
- # ifndef ANSIC
- static char sccsid[] = "@(#)lexi.c 6.0 (Berkeley) 92/06/15";
- # endif /* ANSIC */
- #endif /* not lint */
-
- /* Here we have the token scanner for indent. It scans off one token and
- * puts it in the global variable "token". It returns a code, indicating the
- * type of token scanned. */
-
- #include <ctype.h>
- #include <string.h>
-
- typedef enum char_type {
- alphanum = 1,
- opchar = 3,
- colonchar = 4
- } char_type;
-
- struct templ {
- char *rwd;
- int rwcode;
- cplus_flag cplus;
- };
-
- struct templ specials[100] =
- {
- {"switch", 1, c_and_cplus},
- {"case", 2, c_and_cplus},
- {"break", 0, c_and_cplus},
- {"struct", 3, c_and_cplus},
- {"union", 3, c_and_cplus},
- {"enum", 3, c_and_cplus},
- {"default", 2, c_and_cplus},
- {"int", 4, c_and_cplus},
- {"char", 4, c_and_cplus},
- {"float", 4, c_and_cplus},
- {"double", 4, c_and_cplus},
- {"long", 4, c_and_cplus},
- {"short", 4, c_and_cplus},
- {"typedef", 8, c_and_cplus},
- {"unsigned", 4, c_and_cplus},
- {"register", 4, c_and_cplus},
- {"static", 4, c_and_cplus},
- {"global", 4, c_and_cplus},
- {"extern", 4, c_and_cplus},
- {"void", 4, c_and_cplus},
- {"goto", 0, c_and_cplus},
- {"return", 0, c_and_cplus},
- {"if", 5, c_and_cplus},
- {"while", 5, c_and_cplus},
- {"for", 5, c_and_cplus},
- {"else", 6, c_and_cplus},
- {"do", 6, c_and_cplus},
- {"sizeof", 7, c_and_cplus},
- {"class", 3, cplus_only},
- {"public", 2, cplus_only},
- {"private", 2, cplus_only},
- {"protected", 2, cplus_only},
- {"volatile", 4, c_and_cplus},
- {0, 0}
- };
-
- char chartype[128] =
- { /* this is used to facilitate the decision of
- * what type (alphanumeric, operator) each
- * character is */
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 3, 0, 0, 1, 3, 3, 0,
- 0, 0, 3, 3, 0, 3, 0, 3,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 4, 0, 3, 3, 3, 3,
- 0, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 0, 0, 0, 3, 1,
- 0, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 0, 3, 0, 3, 0
- };
-
-
-
- #ifdef ANSIC
- int lexi(void)
- #else /* ANSIC */
- int lexi()
- #endif /* ANSIC */
- {
- register char *tok = NULL; /* local pointer to next char in token */
- int unary_delim;/* this is set to 1 if the current token
- *
- * forces a following operator to be unary */
- static int last_code = 0; /* the last token type returned */
- static int l_struct = 0; /* set to 1 if the last token was
- * 'struct' */
- static int l_struct_start = 0; /* set at struct, cleared at { or ; */
- static int l_class = 0;/* in c++, class name coming next. */
- int code; /* internal code to be returned */
- char qchar; /* the delimiter character for a string */
-
- tok = token; /* point to start of place to save token */
- unary_delim = false;
- ps.col_1 = ps.last_nl; /* tell world that this token started in
- * column 1 iff the last thing scanned was a
- * newline */
- ps.last_nl = false;
-
- while (*buf_ptr == ' ' || *buf_ptr == '\t') { /* get rid of blanks */
- ps.col_1 = false; /* leading blanks imply token is not in
- * column 1 */
- if (++buf_ptr >= buf_end)
- fill_buffer();
- }
-
- /* Scan an alphanumeric token */
- /* In c++, :: starting token is OK, as is ~ sometimes */
- /* well, int x = ~y; will work oddly here */
- if (((char_type) chartype[*buf_ptr] == alphanum || buf_ptr[0] == '.' && isdigit(buf_ptr[1])) ||
- (cplus && buf_ptr[0] == ':' && buf_ptr[1] == ':') ||
- (cplus && ps.in_decl && *buf_ptr == '~'
- && (char_type) chartype[buf_ptr[1]] == alphanum) /* destructors in
- * classdefs */
- ) {
- /* we have a character or number */
- register char *j = NULL; /* used for searching through list of
- * reserved words */
- register struct templ *p;
-
- if (isdigit(*buf_ptr) || buf_ptr[0] == '.' && isdigit(buf_ptr[1])) {
- int seendot = 0,
- seenexp = 0;
-
- if (*buf_ptr == '0' &&
- (buf_ptr[1] == 'x' || buf_ptr[1] == 'X')) {
- *tok++ = *buf_ptr++;
- *tok++ = *buf_ptr++;
- while (isxdigit(*buf_ptr))
- *tok++ = *buf_ptr++;
- } else
- while (1) {
- if (*buf_ptr == '.')
- if (seendot)
- break;
- else
- seendot++;
- *tok++ = *buf_ptr++;
- if (!isdigit(*buf_ptr) && *buf_ptr != '.')
- if ((*buf_ptr != 'E' && *buf_ptr != 'e') || seenexp)
- break;
- else {
- seenexp++;
- seendot++;
- *tok++ = *buf_ptr++;
- if (*buf_ptr == '+' || *buf_ptr == '-')
- *tok++ = *buf_ptr++;
- }
- }
- if (*buf_ptr == 'L' || *buf_ptr == 'l')
- *tok++ = *buf_ptr++;
- } else {
- int first;
-
- first = 1;
- while ((char_type) chartype[*buf_ptr] == alphanum ||
- (buf_ptr[0] == ':' && buf_ptr[1] == ':' && cplus) ||
- (cplus && first && buf_ptr[0] == '~')) { /* copy it over */
- int colonp;
-
- first = 0;
- colonp = *buf_ptr == ':';
- *tok++ = *buf_ptr++;
- if (colonp) {
- *tok++ = *buf_ptr++;
- /* foo::~foo */
- if (*buf_ptr == '~')
- *tok++ = *buf_ptr++;
- colonp = 0;
- }
- if (buf_ptr >= buf_end)
- fill_buffer();
- }
- }
- *tok++ = '\0';
- while (*buf_ptr == ' ' || *buf_ptr == '\t') { /* get rid of blanks */
- if (++buf_ptr >= buf_end)
- fill_buffer();
- }
- ps.its_a_keyword = false;
- ps.sizeof_keyword = false;
- if (l_struct) { /* if last token was 'struct', then this
- * token should be treated as a declaration */
- if (l_class)
- addkey(tok, 4);
- l_class = false;
- l_struct = false;
- last_code = ident;
- ps.last_u_d = true;
- return (decl);
- }
- ps.last_u_d = false; /* Operator after identifier is binary */
- last_code = ident; /* Remember that this is the code we will
- * return */
-
- /* This loop will check if the token is a keyword. */
- for (p = specials; (j = p->rwd) != 0; p++) {
- tok = token; /* point at scanned token */
- if (*j++ != *tok++ || *j++ != *tok++)
- continue; /* This test depends on the fact that
- * identifiers are always at least 1
- * character long (i.e. the first two bytes
- * of the identifier are always meaningful) */
- if (tok[-1] == 0)
- break; /* If its a one-character identifier */
- while (*tok++ == *j)
- if (*j++ == 0 &&
- (p->cplus == c_and_cplus ||
- (cplus && p->cplus == cplus_only) ||
- (!cplus && p->cplus == c_only)))
- goto found_keyword; /* I wish that C had a multi-level
- * break... */
- }
- if (p->rwd) { /* we have a keyword */
- found_keyword:
- ps.its_a_keyword = true;
- ps.last_u_d = true;
- switch (p->rwcode) {
- case 1: /* it is a switch */
- return (swstmt);
- case 2: /* a case or default */
- return (casestmt);
- case 3: /* a "struct" */
- if (ps.p_l_follow)
- break; /* inside parens: cast */
- l_struct = true;
- if (cplus)
- l_struct_start = true;
- /* automatically note keywords */
- if (cplus && strcmp(tok, "class") == 0 ||
- strcmp(tok, "struct") == 0 ||
- strcmp(tok, "union") == 0 ||
- strcmp(tok, "enum") == 0)
- l_class = true;
- /* Next time around, we will want to know that we have had a
- * 'struct' */
- case 4: /* one of the declaration keywords */
- if (ps.p_l_follow) {
- ps.cast_mask |= 1 << ps.p_l_follow;
- break; /* inside parens: cast */
- }
- last_code = decl;
- return (decl);
- case 5: /* if, while, for */
- return (sp_paren);
- case 6: /* do, else */
- return (sp_nparen);
- case 7:
- ps.sizeof_keyword = true;
- return (ident);
- case 8: /* typedef is a decl */
- last_code = decl;
- return (decl);
- default: /* all others are treated like any other
- * identifier */
- return (ident);
- } /* end of switch */
- } /* end of if (found_it) */
- if (*buf_ptr == '(' && ps.tos <= 1 && ps.ind_level == 0) {
- register char *tp = buf_ptr;
-
- while (tp < buf_end)
- if (*tp++ == ')' && *tp == ';')
- goto not_proc;
- strncpy(ps.procname, token, sizeof ps.procname - 1);
- ps.in_parameter_declaration = 1;
- not_proc:;
- }
- /* The following hack attempts to guess whether or not the current
- * token is in fact a declaration keyword -- one that has been
- * typedefd */
- if (((*buf_ptr == '*' && buf_ptr[1] != '=') || isalpha(*buf_ptr) || *buf_ptr == '_')
- && !ps.p_l_follow
- && !ps.block_init
- && (ps.last_token == rparen || ps.last_token == semicolon ||
- ps.last_token == decl ||
- ps.last_token == lbrace || ps.last_token == rbrace)) {
- ps.its_a_keyword = true;
- ps.last_u_d = true;
- last_code = decl;
- return decl;
- }
- if (last_code == decl) /* if this is a declared variable, then
- * following sign is unary */
- ps.last_u_d = true; /* will make "int a -1" work */
- last_code = ident;
- return (ident); /* the ident is not in the list */
- } /* end of processing for alpanum character */
- /* l l l Scan a non-alphanumeric token */
- l_class = false; /* struct { are not defining a class. */
- *tok++ = *buf_ptr; /* if it is only a one-character token, it is
- * moved here */
- *tok = '\0';
- if (++buf_ptr >= buf_end)
- fill_buffer();
-
- switch (*token) {
- case '\n':
- unary_delim = ps.last_u_d;
- ps.last_nl = true; /* remember that we just had a newline */
- code = (had_eof ? 0 : newline);
-
- /* if data has been exhausted, the newline is a dummy, and we should
- * return code to stop */
- break;
-
- case '\'': /* start of quoted character */
- case '"': /* start of string */
- qchar = *token;
- if (troff) {
- tok[-1] = '`';
- if (qchar == '"')
- *tok++ = '`';
- tok = chfont(&bodyf, &stringf, tok);
- }
- do { /* copy the string */
- while (1) { /* move one character or [/<char>]<char> */
- if (*buf_ptr == '\n') {
- fprintf(stderr, "%d: Unterminated literal\n", line_no);
- goto stop_lit;
- }
- *tok = *buf_ptr++;
- if (buf_ptr >= buf_end)
- fill_buffer();
-
- if (had_eof || ((tok - token) > (bufsize - 2))) {
- printf("Unterminated literal\n");
- ++tok;
- goto stop_lit;
- /* get outof literal copying loop */
- }
- if (*tok == BACKSLASH) { /* if escape, copy extra char */
- if (*buf_ptr == '\n') /* check for escaped newline */
- ++line_no;
- if (troff) {
- *++tok = BACKSLASH;
- if (*buf_ptr == BACKSLASH)
- *++tok = BACKSLASH;
- }
- *++tok = *buf_ptr++;
- ++tok; /* we must increment this again because we
- * copied two chars */
- if (buf_ptr >= buf_end)
- fill_buffer();
- } else
- break; /* we copied one character */
- } /* end of while (1) */
- } while (*tok++ != qchar);
- if (troff) {
- tok = chfont(&stringf, &bodyf, tok - 1);
- if (qchar == '"')
- *tok++ = '\'';
- }
- stop_lit:
- code = ident;
- break;
-
- case ('('):
- case ('['):
- unary_delim = true;
- code = lparen;
- break;
-
- case (')'):
- case (']'):
- code = rparen;
- break;
-
- case '#':
- unary_delim = ps.last_u_d;
- code = preesc;
- break;
-
- case '?':
- unary_delim = true;
- code = question;
- break;
-
- case (':'):
- if (l_struct_start)
- code = ident;
- else
- code = colon;
- unary_delim = true;
- break;
-
- case (';'):
- l_struct_start = false;
- unary_delim = true;
- code = semicolon;
- break;
-
- case ('{'):
- l_struct_start = false;
- unary_delim = true;
-
- /* if (ps.in_or_st) ps.block_init = 1; */
- /* ? code = ps.block_init ? lparen : lbrace; */
- code = lbrace;
- break;
-
- case ('}'):
- unary_delim = true;
- /* ? code = ps.block_init ? rparen : rbrace; */
- code = rbrace;
- break;
-
- case 014: /* a form feed */
- unary_delim = ps.last_u_d;
- ps.last_nl = true; /* remember this so we can set 'ps.col_1'
- * right */
- code = form_feed;
- break;
-
- case (','):
- unary_delim = true;
- code = comma;
- break;
-
- case '.':
- unary_delim = false;
- code = period;
- break;
-
- case '-':
- case '+': /* check for -, +, --, ++ */
- code = (ps.last_u_d ? unary_op : binary_op);
- unary_delim = true;
-
- if (*buf_ptr == token[0]) {
- /* check for doubled character */
- *tok++ = *buf_ptr++;
- /* buffer overflow will be checked at end of loop */
- if (last_code == ident || last_code == rparen) {
- code = (ps.last_u_d ? unary_op : postop);
- /* check for following ++ or -- */
- unary_delim = false;
- }
- } else if (*buf_ptr == '=')
- /* check for operator += */
- *tok++ = *buf_ptr++;
- else if (*buf_ptr == '>') {
- /* check for operator -> */
- *tok++ = *buf_ptr++;
- if (!pointer_as_binop) {
- unary_delim = false;
- code = unary_op;
- ps.want_blank = false;
- }
- }
- break; /* buffer overflow will be checked at end of
- * switch */
-
- case '=':
- if (ps.in_or_st)
- ps.block_init = 1;
- #if 0
- if (chartype[*buf_ptr] == opchar) { /* we have two char assignment */
- tok[-1] = *buf_ptr++;
- if ((tok[-1] == '<' || tok[-1] == '>') && tok[-1] == *buf_ptr)
- *tok++ = *buf_ptr++;
- *tok++ = '='; /* Flip =+ to += */
- *tok = 0;
- }
- #else /* 0 */
- if (*buf_ptr == '=') { /* == */
- *tok++ = '='; /* Flip =+ to += */
- buf_ptr++;
- *tok = 0;
- }
- #endif /* 0 */
- code = binary_op;
- unary_delim = true;
- break;
- /* can drop through!!! */
-
- case '>':
- case '<':
- case '!': /* ops like <, <<, <=, !=, etc. */
- if (*buf_ptr == '>' || *buf_ptr == '<' || *buf_ptr == '=') {
- *tok++ = *buf_ptr;
- if (++buf_ptr >= buf_end)
- fill_buffer();
- }
- if (*buf_ptr == '=')
- *tok++ = *buf_ptr++;
- code = (ps.last_u_d ? unary_op : binary_op);
- unary_delim = true;
- break;
-
- default:
- if (token[0] == '/' && *buf_ptr == '*') {
- /* it is start of a C comment */
- *tok++ = '*';
-
- if (++buf_ptr >= buf_end)
- fill_buffer();
-
- code = comment;
- unary_delim = ps.last_u_d;
- break;
- }
- if (token[0] == '/' && *buf_ptr == '/') {
- /* it is start of a C++ comment */
- *tok++ = '/';
-
- if (++buf_ptr >= buf_end)
- fill_buffer();
-
- code = cc_commnt;
- ps.cc_comment++;
- unary_delim = ps.last_u_d;
- break;
- }
- while (*(tok - 1) == *buf_ptr || *buf_ptr == '=') {
- /* handle ||, &&, etc, and also things as in int *****i */
- *tok++ = *buf_ptr;
- if (++buf_ptr >= buf_end)
- fill_buffer();
- }
- code = (ps.last_u_d ? unary_op : binary_op);
- unary_delim = true;
-
-
- } /* end of switch */
- if (code != newline) {
- l_struct = false;
- last_code = code;
- }
- if (buf_ptr >= buf_end) /* check for input buffer empty */
- fill_buffer();
- ps.last_u_d = unary_delim;
- *tok = '\0'; /* null terminate the token */
- return (code);
- };
-
- /* Add the given keyword to the keyword table, using val as the keyword type */
- #ifdef ANSIC
- void addkey(char *key, int val)
- #else /* ANSIC */
- addkey(key, val)
- char *key;
- int val;
- #endif /* ANSIC */
- {
- register struct templ *p = specials;
-
- while (p->rwd)
- if (p->rwd[0] == key[0] && strcmp(p->rwd, key) == 0)
- return;
- else
- p++;
- if (p >= specials + sizeof specials / sizeof specials[0])
- return; /* For now, table overflows are silently
- * ignored */
- p->rwd = key;
- p->rwcode = val;
- p[1].rwd = 0;
- p[1].rwcode = 0;
- return;
- }
-