261 lines
8.3 KiB
C
261 lines
8.3 KiB
C
/*
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* Haskell language mode for QEmacs.
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*
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* Copyright (c) 2000-2024 Charlie Gordon.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qe.h"
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/*---------------- Haskell coloring ----------------*/
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static char const haskell_keywords[] = {
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"|_|case|class|data|default|deriving|do|else|foreign"
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"|if|import|in|infix|infixl|infixr|instance|let"
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"|module|newtype|of|then|type|where|as|qualified"
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"|return"
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"|True|False"
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};
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static char const haskell_types[] = {
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//String|Int|Char|Bool
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"|"
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};
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enum {
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HASKELL_STYLE_TEXT = QE_STYLE_DEFAULT,
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HASKELL_STYLE_COMMENT = QE_STYLE_COMMENT,
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HASKELL_STYLE_PP_COMMENT = QE_STYLE_PREPROCESS,
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HASKELL_STYLE_STRING = QE_STYLE_STRING,
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HASKELL_STYLE_NUMBER = QE_STYLE_NUMBER,
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HASKELL_STYLE_KEYWORD = QE_STYLE_KEYWORD,
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HASKELL_STYLE_FUNCTION = QE_STYLE_FUNCTION,
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HASKELL_STYLE_TYPE = QE_STYLE_TYPE,
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HASKELL_STYLE_SYMBOL = QE_STYLE_NUMBER,
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};
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enum {
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IN_HASKELL_COMMENT = 0x0F,
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IN_HASKELL_COMMENT_SHIFT = 0,
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IN_HASKELL_PP_COMMENT = 0x10, /* compiler directives {-# ... #-} */
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IN_HASKELL_STRING = 0x20,
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};
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static inline int haskell_is_symbol(char32_t c)
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{
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return qe_findchar("!#$%&+./<=>?@\\^|-~:", c);
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}
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static void haskell_colorize_line(QEColorizeContext *cp,
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const char32_t *str, int n,
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QETermStyle *sbuf, ModeDef *syn)
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{
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int i = 0, start = i, style = 0, level = 0, klen;
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char32_t c, sep = 0;
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int state = cp->colorize_state;
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char kbuf[64];
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if (state & IN_HASKELL_COMMENT)
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goto parse_comment;
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if (state & IN_HASKELL_STRING) {
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sep = '\"';
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state = 0;
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i = cp_skip_blanks(str, i, n);
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if (str[i] == '\\')
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i++;
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goto parse_string;
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}
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while (i < n) {
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start = i;
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c = str[i++];
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switch (c) {
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case '-':
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if (str[i] == '-' && !haskell_is_symbol(str[i + 1])) {
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i = n;
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style = HASKELL_STYLE_COMMENT;
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break;
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}
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goto parse_symbol;
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case '{':
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if (str[i] == '-') {
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state |= 1 << IN_HASKELL_COMMENT_SHIFT;
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i++;
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if (str[i] == '#') {
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state |= IN_HASKELL_PP_COMMENT;
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i++;
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}
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parse_comment:
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level = (state & IN_HASKELL_COMMENT) >> IN_HASKELL_COMMENT_SHIFT;
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style = HASKELL_STYLE_COMMENT;
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if (state & IN_HASKELL_PP_COMMENT)
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style = HASKELL_STYLE_PP_COMMENT;
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while (i < n) {
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c = str[i++];
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if (c == '{' && str[i] == '-') {
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level++;
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i++;
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continue;
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}
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if (c == '-' && str[i] == '}') {
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i++;
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level--;
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if (level == 0) {
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state &= ~IN_HASKELL_PP_COMMENT;
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i++;
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break;
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}
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}
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}
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state &= ~IN_HASKELL_COMMENT;
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state |= level << IN_HASKELL_COMMENT_SHIFT;
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break;
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}
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FALLTHROUGH;
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case '}':
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case '(':
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case ')':
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case '[':
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case ']':
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case ',':
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case ';':
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case '`':
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/* special */
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continue;
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case '\'':
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case '\"':
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/* parse string const */
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sep = c;
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parse_string:
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while (i < n) {
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c = str[i++];
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if (c == '\\') {
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if (i == n) {
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if (sep == '\"') {
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/* XXX: should ignore whitespace */
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state |= IN_HASKELL_STRING;
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}
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} else
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if (str[i] == '^' && i + 1 < n && str[i + 1] != sep) {
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i += 2;
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} else {
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i += 1;
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}
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} else
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if (c == sep) {
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state &= ~IN_HASKELL_STRING;
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break;
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}
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}
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style = HASKELL_STYLE_STRING;
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break;
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default:
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if (qe_isdigit(c)) {
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if (c == '0' && qe_tolower(str[i]) == 'o') {
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/* octal numbers */
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for (i += 1; qe_isoctdigit(str[i]); i++)
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continue;
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} else
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if (c == '0' && qe_tolower(str[i]) == 'x') {
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/* hexadecimal numbers */
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for (i += 1; qe_isxdigit(str[i]); i++)
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continue;
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} else {
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/* decimal numbers */
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for (; qe_isdigit(str[i]); i++)
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continue;
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if (str[i] == '.' && qe_isdigit(str[i + 1])) {
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/* decimal floats require a digit after the '.' */
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for (i += 2; qe_isdigit(str[i]); i++)
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continue;
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if (qe_tolower(str[i]) == 'e') {
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int k = i + 1;
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if (str[k] == '+' || str[k] == '-')
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k++;
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if (qe_isdigit(str[k])) {
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for (i = k + 1; qe_isdigit(str[i]); i++)
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continue;
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}
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}
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}
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}
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/* XXX: should detect malformed number constants */
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style = HASKELL_STYLE_NUMBER;
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break;
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}
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if (qe_isalpha_(c)) {
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for (klen = 0, i--; qe_isalnum_(str[i]) || str[i] == '\''; i++) {
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if (klen < countof(kbuf) - 1)
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kbuf[klen++] = str[i];
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}
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kbuf[klen] = '\0';
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if (strfind(syn->keywords, kbuf)) {
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style = HASKELL_STYLE_KEYWORD;
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break;
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}
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if (strfind(syn->types, kbuf)) {
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style = HASKELL_STYLE_TYPE;
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break;
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}
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if (check_fcall(str, i)) {
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style = HASKELL_STYLE_FUNCTION;
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break;
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}
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continue;
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}
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parse_symbol:
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if (haskell_is_symbol(c)) {
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for (; haskell_is_symbol(str[i]); i++)
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continue;
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style = HASKELL_STYLE_SYMBOL;
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break;
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}
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continue;
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}
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if (style) {
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SET_STYLE(sbuf, start, i, style);
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style = 0;
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}
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}
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cp->colorize_state = state;
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}
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static ModeDef haskell_mode = {
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.name = "Haskell",
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.extensions = "hs|haskell",
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.shell_handlers = "haskell",
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.keywords = haskell_keywords,
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.types = haskell_types,
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.colorize_func = haskell_colorize_line,
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};
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static int haskell_init(QEmacsState *qs)
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{
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qe_register_mode(qs, &haskell_mode, MODEF_SYNTAX);
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return 0;
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}
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qe_module_init(haskell_init);
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