378 lines
11 KiB
C
378 lines
11 KiB
C
/*
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* Perl Source mode for QEmacs.
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*
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* Copyright (c) 2000-2008 Charlie Gordon.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "qe.h"
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static const char *perl_mode_extensions = "pl|perl|pm";
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/*---------------- Perl colors ----------------*/
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#define PERL_TEXT QE_STYLE_DEFAULT
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#define PERL_COMMENT QE_STYLE_COMMENT
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#define PERL_STRING QE_STYLE_STRING
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#define PERL_REGEX QE_STYLE_STRING
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#define PERL_DELIM QE_STYLE_KEYWORD
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#define PERL_KEYWORD QE_STYLE_KEYWORD
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#define PERL_VAR QE_STYLE_VARIABLE
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#define PERL_NUMBER QE_STYLE_NUMBER
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#define IN_STRING1 0x01 /* single quote */
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#define IN_STRING2 0x02 /* double quote */
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#define IN_FORMAT 0x04 /* format = ... */
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#define IN_INPUT 0x08
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/* CG: bogus if multiple regions are colorized, should use signature */
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static unsigned int perl_eos[100];
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static int perl_eos_len;
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static int perl_var(const unsigned int *str, int j, int n)
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{
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if (qe_isdigit(str[j]))
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return j;
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for (; j < n; j++) {
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if (qe_isalnum_(str[j]))
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continue;
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if (str[j] == '\'' && qe_isalpha_(str[j + 1]))
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j++;
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else
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break;
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}
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return j;
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}
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static int perl_number(const unsigned int *str, int j, __unused__ int n)
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{
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if (str[j] == '0') {
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j++;
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if (str[j] == 'x' || str[j] == 'X') {
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do j++; while (qe_isxdigit(str[j]));
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return j;
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}
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if (str[j] >= '0' && str[j] <= '7') {
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do j++; while (str[j] >= '0' && str[j] <= '7');
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return j;
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}
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}
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while (qe_isdigit(str[j]))
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j++;
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if (str[j] == '.')
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do j++; while (qe_isdigit(str[j]));
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if (str[j] == 'E' || str[j] == 'e') {
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j++;
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if (str[j] == '-' || str[j] == '+')
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j++;
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while (qe_isdigit(str[j]))
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j++;
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}
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return j;
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}
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/* return offset of matching delimiter or end of string */
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static int perl_string(const unsigned int *str, unsigned int delim,
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int j, int n)
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{
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for (; j < n; j++) {
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if (str[j] == '\\')
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j++;
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else
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if (str[j] == delim)
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return j;
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}
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return j;
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}
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static void perl_colorize_line(unsigned int *str, int n, int *statep,
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__unused__ int state_only)
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{
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int i = 0, c, c1, c2, j = i, s1, s2, delim = 0;
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int colstate = *statep;
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if (colstate & (IN_STRING1|IN_STRING2)) {
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delim = (colstate & IN_STRING1) ? '\'' : '\"';
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i = perl_string(str, delim, j, n);
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if (i < n) {
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i++;
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colstate &= ~(IN_STRING1|IN_STRING2);
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}
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set_color(str + j, str + i, PERL_STRING);
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} else
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if (colstate & IN_FORMAT) {
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i = n;
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if (n == 1 && str[0] == '.')
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colstate &= ~IN_FORMAT;
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set_color(str + j, str + i, PERL_STRING);
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}
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if (colstate & IN_INPUT) {
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i = n;
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if (n == perl_eos_len && !umemcmp(perl_eos, str, n)) {
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colstate &= ~IN_INPUT;
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set_color(str + j, str + i, PERL_KEYWORD);
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} else {
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set_color(str + j, str + i, PERL_STRING);
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}
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}
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while (i < n) {
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j = i + 1;
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c1 = str[j];
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switch (c = str[i]) {
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case '$':
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if (c1 == '^' && qe_isalpha(str[i + 2])) {
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j = i + 3;
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goto keyword;
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}
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if (c1 == '#' && qe_isalpha_(str[i + 2]))
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j++;
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else
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if (memchr("|%=-~^123456789&`'+_./\\,\"#$?*0[];!@", c1, 35)) {
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/* Special variable */
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j = i + 2;
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goto keyword;
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}
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/* FALL THRU */
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case '*':
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case '@': /* arrays */
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case '%': /* associative arrays */
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case '&':
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if (j >= n)
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break;
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s1 = perl_var(str, j, n);
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if (s1 > j) {
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set_color(str + i, str + s1, PERL_VAR);
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i = s1;
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continue;
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}
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break;
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case '-':
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if (c1 == '-') {
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i += 2;
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continue;
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}
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if (qe_isalpha(c1) && !qe_isalnum(str[i + 2])) {
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j = i + 2;
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goto keyword;
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}
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break;
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case '#':
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set_color(str + i, str + n, PERL_COMMENT);
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i = n;
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continue;
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case '<':
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if (c1 == '<') {
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/* Should check for unary context */
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s1 = i + 2;
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c2 = str[s1];
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if (c2 == '"' || c2 == '\'' || c2 == '`') {
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s2 = perl_string(str, c2, ++s1, n);
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} else {
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s2 = perl_var(str, s1, n);
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}
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if (s2 > s1) {
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umemcpy(perl_eos, str + s1, s2 - s1);
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perl_eos_len = s2 - s1;
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colstate |= IN_INPUT;
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}
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i += 2;
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continue;
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}
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delim = '>';
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goto string;
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case '/':
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case '?':
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/* Should check for unary context */
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/* parse regex */
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s1 = perl_string(str, c, j, n);
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if (s1 >= n)
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break;
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set_color1(str + i, PERL_DELIM);
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set_color(str + i + 1, str + s1, PERL_REGEX);
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i = s1;
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while (++i < n && qe_isalpha(str[i]))
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continue;
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set_color(str + s1, str + i, PERL_DELIM);
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continue;
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case '\'':
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case '`':
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case '"':
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delim = c;
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string:
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/* parse string const */
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s1 = perl_string(str, delim, j, n);
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if (s1 >= n) {
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if (c == '\'') {
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set_color(str + i, str + n, PERL_STRING);
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i = n;
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colstate |= IN_STRING1;
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continue;
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}
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if (c == '\"') {
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set_color(str + i, str + n, PERL_STRING);
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i = n;
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colstate |= IN_STRING2;
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continue;
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}
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/* ` string spanning more than one line treated as
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* operator.
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*/
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break;
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}
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s1++;
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set_color(str + i, str + s1, PERL_STRING);
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i = s1;
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continue;
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case '.':
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if (qe_isdigit(c1))
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goto number;
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break;
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default:
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if (qe_isdigit(c)) {
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number:
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j = perl_number(str, i, n);
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set_color(str + i, str + j, PERL_NUMBER);
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i = j;
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continue;
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}
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if (!qe_isalpha_(c))
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break;
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j = perl_var(str, i, n);
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if (j == i)
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break;
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if (j >= n)
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goto keyword;
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/* Should check for context */
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if ((j == i + 1 && (c == 'm' || c == 'q'))
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|| (j == i + 2 && c == 'q' && (c1 == 'q' || c1 == 'x'))) {
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s1 = perl_string(str, str[j], j + 1, n);
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if (s1 >= n)
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goto keyword;
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set_color(str + i, str + j + 1, PERL_DELIM);
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set_color(str + j + 1, str + s1, PERL_REGEX);
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i = s1;
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while (++i < n && qe_isalpha(str[i]))
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continue;
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set_color(str + s1, str + i, PERL_DELIM);
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continue;
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}
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/* Should check for context */
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if ((j == i + 1 && (c == 's' /* || c == 'y' */))
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|| (j == i + 2 && c == 't' && c1 == 'r')) {
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s1 = perl_string(str, str[j], j + 1, n);
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if (s1 >= n)
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goto keyword;
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s2 = perl_string(str, str[j], s1 + 1, n);
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if (s2 >= n)
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goto keyword;
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set_color(str + i, str + j + 1, PERL_DELIM);
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set_color(str + j + 1, str + s1, PERL_REGEX);
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set_color1(str + s1, PERL_DELIM);
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set_color(str + s1 + 1, str + s2, PERL_REGEX);
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i = s2;
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while (++i < n && qe_isalpha(str[i]))
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continue;
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set_color(str + s2, str + i, PERL_DELIM);
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continue;
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}
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keyword:
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if (j - i == 6 && ustristart(str + i, "format", NULL)) {
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for (s1 = 0; s1 < i; s1++) {
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if (!qe_isspace(str[s1]))
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break;
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}
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if (s1 == i) {
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/* keyword is first on line */
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colstate |= IN_FORMAT;
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}
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}
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set_color(str + i, str + j, PERL_KEYWORD);
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i = j;
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continue;
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}
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i++;
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continue;
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}
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*statep = colstate;
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}
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#undef PERL_TEXT
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#undef PERL_COMMENT
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#undef PERL_STRING
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#undef PERL_REGEX
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#undef PERL_DELIM
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#undef PERL_KEYWORD
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#undef PERL_VAR
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#undef PERL_NUMBER
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#undef IN_STRING1
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#undef IN_STRING2
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#undef IN_FORMAT
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#undef IN_INPUT
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static int perl_mode_probe(ModeProbeData *p)
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{
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/* just check file extension */
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if (match_extension(p->filename, perl_mode_extensions))
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return 80;
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if (p->buf[0] == '#' && p->buf[1] == '!' &&
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memstr(p->buf, p->line_len, "/usr/bin/perl"))
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return 80;
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return 0;
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}
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static int perl_mode_init(EditState *s, ModeSavedData *saved_data)
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{
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int ret;
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ret = text_mode_init(s, saved_data);
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if (ret)
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return ret;
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set_colorize_func(s, perl_colorize_line);
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return ret;
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}
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/* specific perl commands */
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static CmdDef perl_commands[] = {
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CMD_DEF_END,
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};
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static ModeDef perl_mode;
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static int perl_init(void)
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{
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/* c mode is almost like the text mode, so we copy and patch it */
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memcpy(&perl_mode, &text_mode, sizeof(ModeDef));
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perl_mode.name = "Perl";
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perl_mode.mode_probe = perl_mode_probe;
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perl_mode.mode_init = perl_mode_init;
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qe_register_mode(&perl_mode);
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qe_register_cmd_table(perl_commands, &perl_mode);
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return 0;
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}
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qe_module_init(perl_init);
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