392 lines
12 KiB
C
392 lines
12 KiB
C
/*
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* Perl Source mode for QEmacs.
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*
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* Copyright (c) 2000-2017 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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/*---------------- Perl colors ----------------*/
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static char const perl_keywords[] = {
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/* Perl keywords */
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"ge|gt|le|lt|cmp|eq|ne|int|x|or|and|not|xor|" // special case x=
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"do|else|elsif|if|for|until|while|foreach|unless|last|"
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"require|package|use|strict|BEGIN|bless|isa|"
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"sub|return|eval|try|catch|with|throw|except|otherwise|finally|"
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"undef|true|false|"
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"exit|die|warn|system|"
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"print|printf|open|close|readline|read|binmode|seek|tell|flock|"
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"opendir|closedir|readdir|unlink|rename|chdir|truncate|"
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"chmod|kill|killall|"
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"chomp|pos|length|substr|lc|uc|lcfirst|ucfirst|split|hex|"
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"sprintf|index|"
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"reverse|pop|push|shift|unshift|splice|join|map|sort|"
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"delete|insert|keys|values|exists|defined|"
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"scalar|wantarray|ref|"
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"STDIN|STDOUT|STDERR|"
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};
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static char const perl_types[] = {
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"my|local|"
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};
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// qq~ multiline string ~
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enum {
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PERL_STYLE_TEXT = QE_STYLE_DEFAULT,
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PERL_STYLE_COMMENT = QE_STYLE_COMMENT,
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PERL_STYLE_STRING = QE_STYLE_STRING,
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PERL_STYLE_REGEX = QE_STYLE_STRING,
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PERL_STYLE_DELIM = QE_STYLE_KEYWORD,
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PERL_STYLE_KEYWORD = QE_STYLE_KEYWORD,
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PERL_STYLE_VAR = QE_STYLE_VARIABLE,
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PERL_STYLE_NUMBER = QE_STYLE_NUMBER,
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};
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enum {
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IN_PERL_STRING1 = 0x01, /* single quote */
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IN_PERL_STRING2 = 0x02, /* double quote */
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IN_PERL_FORMAT = 0x04, /* format = ... */
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IN_PERL_HEREDOC = 0x08,
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IN_PERL_POD = 0x10,
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};
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/* CG: bogus if multiple regions are colorized, should use signature */
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/* XXX: should move this to mode data */
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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, qe__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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/* hexadecimal numbers */
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// XXX: should verify if 'X' is really accepted
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// XXX: should accept embedded '_'
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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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/* octal numbers */
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// XXX: should accept embedded '_'
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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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// XXX: should accept embedded '_'
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while (qe_isdigit(str[j]))
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j++;
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/* integral part is optional */
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if (str[j] == '.') {
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// XXX: should accept embedded '_'
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do { j++; } while (qe_isdigit(str[j]));
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}
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// XXX: should verify if 'E' is really accepted
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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(QEColorizeContext *cp,
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unsigned int *str, int n, ModeDef *syn)
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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 = cp->colorize_state;
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if (colstate & (IN_PERL_STRING1 | IN_PERL_STRING2)) {
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delim = (colstate & IN_PERL_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_PERL_STRING1 | IN_PERL_STRING2);
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}
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SET_COLOR(str, j, i, PERL_STYLE_STRING);
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} else
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if (colstate & IN_PERL_FORMAT) {
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i = n;
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if (n == 1 && str[0] == '.')
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colstate &= ~IN_PERL_FORMAT;
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SET_COLOR(str, j, i, PERL_STYLE_STRING);
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}
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if (colstate & IN_PERL_HEREDOC) {
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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_PERL_HEREDOC;
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SET_COLOR(str, j, i, PERL_STYLE_KEYWORD);
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} else {
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SET_COLOR(str, j, i, PERL_STYLE_STRING);
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}
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}
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if (str[i] == '=' && qe_isalpha(str[i + 1])) {
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colstate |= IN_PERL_POD;
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}
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if (colstate & IN_PERL_POD) {
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if (ustrstart(str + i, "=cut", NULL)) {
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colstate &= ~IN_PERL_POD;
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}
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if (str[i] == '=' && qe_isalpha(str[i + 1])) {
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i = n;
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SET_COLOR(str, j, i, PERL_STYLE_KEYWORD);
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} else {
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i = n;
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SET_COLOR(str, j, i, PERL_STYLE_COMMENT);
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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, s1, PERL_STYLE_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, n, PERL_STYLE_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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while (qe_isblank(str[s1]))
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s1++;
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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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perl_eos_len = min((int)(s2 - s1), countof(perl_eos) - 1);
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umemcpy(perl_eos, str + s1, perl_eos_len);
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perl_eos[perl_eos_len] = '\0';
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colstate |= IN_PERL_HEREDOC;
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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_STYLE_DELIM);
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SET_COLOR(str, i + 1, s1, PERL_STYLE_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, i, PERL_STYLE_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, n, PERL_STYLE_STRING);
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i = n;
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colstate |= IN_PERL_STRING1;
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continue;
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}
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if (c == '\"') {
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SET_COLOR(str, i, n, PERL_STYLE_STRING);
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i = n;
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colstate |= IN_PERL_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, s1, PERL_STYLE_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, j, PERL_STYLE_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, j + 1, PERL_STYLE_DELIM);
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SET_COLOR(str, j + 1, s1, PERL_STYLE_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, i, PERL_STYLE_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, j + 1, PERL_STYLE_DELIM);
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SET_COLOR(str, j + 1, s1, PERL_STYLE_REGEX);
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SET_COLOR1(str, s1, PERL_STYLE_DELIM);
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SET_COLOR(str, s1 + 1, s2, PERL_STYLE_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, i, PERL_STYLE_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_isblank(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_PERL_FORMAT;
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}
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}
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SET_COLOR(str, i, j, PERL_STYLE_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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cp->colorize_state = colstate;
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}
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static ModeDef perl_mode = {
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.name = "Perl",
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.extensions = "pl|perl|pm",
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.shell_handlers = "perl|perl5",
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.colorize_func = perl_colorize_line,
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.keywords = perl_keywords,
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.types = perl_types,
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};
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static int perl_init(void)
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{
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qe_register_mode(&perl_mode, MODEF_SYNTAX);
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return 0;
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}
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qe_module_init(perl_init);
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