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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,211 @@ | ||
| // -*- mode:c++;indent-tabs-mode:nil;c-basic-offset:4;coding:utf-8 -*- | ||
| // vi: set et ft=cpp ts=4 sts=4 sw=4 fenc=utf-8 :vi | ||
| // | ||
| // Copyright 2024 Mozilla Foundation | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| #include "highlight.h" | ||
| #include "string.h" | ||
| #include <cosmo.h> | ||
| #include <ctype.h> | ||
|
|
||
| enum { | ||
| NORMAL, | ||
| BACKSLASH, | ||
| COMMAND, | ||
| COMMENT, | ||
| DOLLAR, | ||
| MATH, | ||
| MATH_BACKSLASH, | ||
| BACKTICK, | ||
| STRING, | ||
| STRING_QUOTE, | ||
| }; | ||
|
|
||
| HighlightTex::HighlightTex() { | ||
| } | ||
|
|
||
| HighlightTex::~HighlightTex() { | ||
| } | ||
|
|
||
| void HighlightTex::feed(std::string *r, std::string_view input) { | ||
| for (size_t i = 0; i < input.size(); ++i) { | ||
| wchar_t c; | ||
| int b = input[i] & 255; | ||
| if (!u_) { | ||
| if (b < 0300) { | ||
| c = b; | ||
| } else { | ||
| c_ = ThomPikeByte(b); | ||
| u_ = ThomPikeLen(b) - 1; | ||
| continue; | ||
| } | ||
| } else { | ||
| c = c_ = ThomPikeMerge(c_, b); | ||
| if (--u_) | ||
| continue; | ||
| } | ||
| switch (t_) { | ||
|
|
||
| Normal: | ||
| case NORMAL: | ||
| if (c == '\\') { | ||
| t_ = BACKSLASH; | ||
| } else if (c == '$') { | ||
| t_ = DOLLAR; | ||
| } else if (c == '`') { | ||
| t_ = BACKTICK; | ||
| } else if (c == '%') { | ||
| t_ = COMMENT; | ||
| *r += HI_COMMENT; | ||
| *r += '%'; | ||
| } else { | ||
| append_wchar(r, c); | ||
| } | ||
| break; | ||
|
|
||
| case BACKSLASH: | ||
| if (c == '\\') { | ||
| *r += HI_WARNING; | ||
| *r += "\\\\"; | ||
| *r += HI_RESET; | ||
| t_ = NORMAL; | ||
| } else if (isspace(c)) { | ||
| *r += '\\'; | ||
| t_ = NORMAL; | ||
| goto Normal; | ||
| } else if (isalpha(c) || c == '@') { | ||
| *r += HI_KEYWORD; | ||
| *r += '\\'; | ||
| append_wchar(r, c); | ||
| t_ = COMMAND; | ||
| } else { | ||
| *r += HI_ESCAPE; | ||
| *r += '\\'; | ||
| append_wchar(r, c); | ||
| *r += HI_RESET; | ||
| t_ = NORMAL; | ||
| } | ||
| break; | ||
|
|
||
| case COMMAND: | ||
| if (isalpha(c) || c == '@') { | ||
| append_wchar(r, c); | ||
| } else { | ||
| *r += HI_RESET; | ||
| t_ = NORMAL; | ||
| goto Normal; | ||
| } | ||
| break; | ||
|
|
||
| case DOLLAR: | ||
| if (c == '$') { | ||
| *r += "$$"; | ||
| t_ = NORMAL; | ||
| } else if (c == '\\') { | ||
| *r += HI_MATH; | ||
| *r += "$\\"; | ||
| t_ = MATH_BACKSLASH; | ||
| } else { | ||
| *r += HI_MATH; | ||
| *r += "$"; | ||
| append_wchar(r, c); | ||
| t_ = MATH; | ||
| } | ||
| break; | ||
|
|
||
| case MATH: | ||
| if (c == '$') { | ||
| *r += "$"; | ||
| *r += HI_RESET; | ||
| t_ = NORMAL; | ||
| } else if (c == '\\') { | ||
| *r += '\\'; | ||
| t_ = MATH_BACKSLASH; | ||
| } else { | ||
| append_wchar(r, c); | ||
| } | ||
| break; | ||
|
|
||
| case MATH_BACKSLASH: | ||
| append_wchar(r, c); | ||
| t_ = MATH; | ||
| break; | ||
|
|
||
| case COMMENT: | ||
| append_wchar(r, c); | ||
| if (c == '\n') { | ||
| *r += HI_RESET; | ||
| t_ = NORMAL; | ||
| } | ||
| break; | ||
|
|
||
| case BACKTICK: | ||
| if (c == '`') { | ||
| *r += HI_STRING; | ||
| *r += "``"; | ||
| t_ = STRING; | ||
| } else { | ||
| *r += '`'; | ||
| t_ = NORMAL; | ||
| goto Normal; | ||
| } | ||
| break; | ||
|
|
||
| case STRING: | ||
| append_wchar(r, c); | ||
| if (c == '\'') | ||
| t_ = STRING_QUOTE; | ||
| break; | ||
|
|
||
| case STRING_QUOTE: | ||
| append_wchar(r, c); | ||
| if (c == '\'') { | ||
| *r += HI_RESET; | ||
| t_ = NORMAL; | ||
| } else { | ||
| t_ = STRING; | ||
| } | ||
| break; | ||
|
|
||
| default: | ||
| __builtin_unreachable(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void HighlightTex::flush(std::string *r) { | ||
| switch (t_) { | ||
| case BACKTICK: | ||
| *r += '`'; | ||
| break; | ||
| case DOLLAR: | ||
| *r += '$'; | ||
| break; | ||
| case BACKSLASH: | ||
| *r += '\\'; | ||
| break; | ||
| case COMMAND: | ||
| case COMMENT: | ||
| case MATH: | ||
| case MATH_BACKSLASH: | ||
| case STRING: | ||
| case STRING_QUOTE: | ||
| *r += HI_RESET; | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
| t_ = NORMAL; | ||
| } |