286 lines
9.1 KiB
C
286 lines
9.1 KiB
C
/*
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* Rust mode for QEmacs.
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*
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* Copyright (c) 2015-2017 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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/* XXX: should handle :: */
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static const char rust_keywords[] = {
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/* keywords */
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"_|as|box|break|const|continue|crate|else|enum|extern|"
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"fn|for|if|impl|in|let|loop|match|mod|move|mut|"
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"priv|proc|pub|ref|return|self|static|struct|trait|"
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"type|typeof|unsafe|use|where|while|"
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/* Constants */
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"false|true|"
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};
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static const char rust_types[] = {
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"bool|char|i8|i16|i32|i64|isize|u8|u16|u32|u64|usize|f32|f64|str|"
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"String|PathBuf|None|Option|Vec|List|Box|Cons|"
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};
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enum {
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RUST_STYLE_DEFAULT = 0,
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RUST_STYLE_PREPROCESS = QE_STYLE_PREPROCESS,
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RUST_STYLE_COMMENT = QE_STYLE_COMMENT,
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RUST_STYLE_REGEX = QE_STYLE_STRING_Q,
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RUST_STYLE_STRING = QE_STYLE_STRING,
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RUST_STYLE_STRING_Q = QE_STYLE_STRING_Q,
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RUST_STYLE_NUMBER = QE_STYLE_NUMBER,
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RUST_STYLE_KEYWORD = QE_STYLE_KEYWORD,
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RUST_STYLE_TYPE = QE_STYLE_TYPE,
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RUST_STYLE_FUNCTION = QE_STYLE_FUNCTION,
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RUST_STYLE_VARIABLE = QE_STYLE_VARIABLE,
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};
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/* rust-mode colorization states */
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enum {
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IN_RUST_COMMENT = 0x01, /* multiline comment */
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IN_RUST_STRING = 0x04, /* double-quoted string */
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IN_RUST_STRING_Q = 0x08, /* single-quoted string */
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};
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static void rust_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, start, i1, i2, indent, c, state, style, klen, delim;
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char kbuf[64];
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for (indent = 0; qe_isblank(str[indent]); indent++)
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continue;
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state = cp->colorize_state;
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start = i;
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c = 0;
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style = RUST_STYLE_DEFAULT;
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if (i >= n)
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goto the_end;
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if (state) {
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/* if already in a state, go directly in the code parsing it */
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if (state & IN_RUST_COMMENT)
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goto parse_comment;
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if (state & IN_RUST_STRING)
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goto parse_string;
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if (state & IN_RUST_STRING_Q)
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goto parse_string_q;
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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] == '*') {
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/* multi-line comment */
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i++;
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parse_comment:
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style = RUST_STYLE_COMMENT;
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state |= IN_RUST_COMMENT;
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for (; i < n; i++) {
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if (str[i] == '*' && str[i + 1] == '/') {
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i += 2;
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state &= ~IN_RUST_COMMENT;
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break;
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}
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}
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break;
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} else
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if (str[i] == '/') {
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/* line comment */
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/* XXX: handle doc-comments introduced by /// or //! */
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style = RUST_STYLE_COMMENT;
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i = n;
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break;
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}
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break;
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case '#': /* preprocessor */
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if (i == indent + 1) {
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if (str[i] == '!') i++;
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style = RUST_STYLE_PREPROCESS;
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break;
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}
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break;
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// case 'r': /* XXX: rust language r" regex " */
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case '\'': /* character constant */
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/* rust accepts quoted characters and quoted symbols */
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if (i + 1 < n && (str[i] == '\\' || str[i+1] == '\''))
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goto parse_string_q;
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else
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goto normal;
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parse_string_q:
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state |= IN_RUST_STRING_Q;
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style = RUST_STYLE_STRING_Q;
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delim = '\'';
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goto string;
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case '\"': /* string literal */
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parse_string:
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state |= IN_RUST_STRING;
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style = RUST_STYLE_STRING;
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delim = '\"';
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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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break;
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i++;
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} else
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if (c == delim) {
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state &= ~(IN_RUST_STRING | IN_RUST_STRING_Q);
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break;
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}
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}
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break;
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default:
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normal:
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if (qe_isdigit(c)) {
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int j;
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// Integers:
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// 0x[0-9a-fA-F_]+ //
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// 0o[0-8_]+ //
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// 0b[01_]+ //
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// [0-9][0-9_]* //
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// Floats:
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// [0-9][0-9_]*\.[0-9_]*([eE][-\+]?[0-9_]+)?
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// [0-9][0-9_]*(\.[0-9_]*)?[eE][-\+]?[0-9_]+
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// number suffixes:
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static const char * const suffixes[] = {
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"i8", "i16", "i32", "i64", "u8", "u16", "u32", "u64",
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"f32", "f64",
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};
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if (c == '0' && str[i] == 'x' && qe_isxdigit_(str[i + 1])) {
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for (i += 3; qe_isxdigit_(str[i]); i++)
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continue;
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} else
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if (c == '0' && str[i] == 'o' && qe_isoctdigit_(str[i + 1])) {
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for (i += 3; qe_isoctdigit_(str[i]); i++)
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continue;
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} else
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if (c == '0' && str[i] == 'b' && qe_isbindigit_(str[i + 1])) {
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for (i += 3; qe_isbindigit_(str[i]); i++)
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continue;
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} else {
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while (qe_isdigit_(str[i]))
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i++;
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if (str[i] == '.' && qe_isdigit_(str[i + 1])) {
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for (i += 2; qe_isdigit_(str[i]); i++)
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continue;
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}
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if (str[i] == 'e' || str[i] == 'E') {
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j = i + 1;
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if (str[j] == '+' || str[j] == '-')
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j++;
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if (qe_isdigit_(str[j])) {
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for (i = j + 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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if (qe_isalpha(str[i])) {
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for (j = 0; j < countof(suffixes); j++) {
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if (ustrstart(str + i, suffixes[j], &klen)) {
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i += klen;
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break;
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}
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}
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}
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style = RUST_STYLE_NUMBER;
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break;
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}
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if (qe_isword(c) || c == '$') {
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/* identifiers match:
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* "[a-zA-Z_\x80-\xff][a-zA-Z_0-9\x80-\xff]*"
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*/
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klen = get_c_identifier(kbuf, countof(kbuf),
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str + start, CLANG_RUST);
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i = start + klen;
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if (str[i] == '!'
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&& (str[i + 1] == '(' || !strcmp(kbuf, "macro_rules"))) {
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/* macro definition or invokation */
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i += 1;
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style = RUST_STYLE_PREPROCESS;
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break;
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}
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if (strfind(syn->keywords, kbuf)) {
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style = RUST_STYLE_KEYWORD;
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break;
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}
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i1 = i;
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while (qe_isblank(str[i1]))
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i1++;
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i2 = i1;
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while (qe_isblank(str[i2]))
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i2++;
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if ((start == 0 || str[start - 1] != '.')
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&& !qe_findchar(".(:", str[i])
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&& strfind(syn->types, kbuf)) {
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style = RUST_STYLE_TYPE;
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break;
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}
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if (str[i1] == '(') {
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/* function call */
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/* XXX: different styles for call and definition */
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style = RUST_STYLE_FUNCTION;
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break;
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}
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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_COLOR(str, start, i, style);
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style = 0;
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}
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}
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the_end:
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/* set style on eol char */
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SET_COLOR1(str, n, style);
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cp->colorize_state = state;
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}
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static ModeDef rust_mode = {
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.name = "Rust",
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.extensions = "rs",
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.shell_handlers = "rustc",
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.colorize_func = rust_colorize_line,
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.colorize_flags = CLANG_RUST,
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.keywords = rust_keywords,
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.types = rust_types,
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.indent_func = c_indent_line,
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.auto_indent = 1,
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.fallback = &c_mode,
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};
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static int rust_init(void)
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{
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qe_register_mode(&rust_mode, MODEF_SYNTAX);
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return 0;
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}
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