src/highlighter.c

Thu, 11 Jul 2024 19:30:55 +0200

author
Mike Becker <universe@uap-core.de>
date
Thu, 11 Jul 2024 19:30:55 +0200
changeset 77
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parent 76
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child 80
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permissions
-rw-r--r--

Added tag v3.1 for changeset 44c7423d6ce2

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2016 Mike Becker. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 *
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28 */
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29
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30 #include "highlighter.h"
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31
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32 #include <string.h>
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33 #include <ctype.h>
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34
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35 #include <cx/string.h>
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36 #include <cx/printf.h>
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37
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38 static void put_htmlescaped(CxBuffer *dest, char c) {
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39 if (c == '>') {
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40 cxBufferPutString(dest, "&gt;");
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41 } else if (c == '<') {
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42 cxBufferPutString(dest, "&lt;");
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43 } else if (c) {
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44 cxBufferPut(dest, c);
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45 }
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46 }
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47
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48 static void put_htmlescapedstr(CxBuffer *dest, cxstring s) {
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49 for (int i = 0 ; i < s.length ; i++) {
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50 put_htmlescaped(dest, s.ptr[i]);
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51 }
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52 }
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53
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54 static int check_keyword(cxstring word, const char** keywords) {
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55 for (int i = 0 ; keywords[i] ; i++) {
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56 if (cx_strcmp(word, cx_str(keywords[i])) == 0) {
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57 return 1;
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58 }
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59 }
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60 return 0;
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61 }
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62
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63 static int check_capsonly(cxstring word) {
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64 for (size_t i = 0 ; i < word.length ; i++) {
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65 if (!isupper(word.ptr[i]) && !isdigit(word.ptr[i])
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66 && word.ptr[i] != '_') {
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67 return 0;
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68 }
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69 }
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70 return 1;
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71 }
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72
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73 /* Plaintext Highlighter */
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74
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75 void c2html_plain_highlighter(char const *src, CxBuffer *dest,
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76 c2html_highlighter_data *hd) {
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77 while (*src && *src != '\n') {
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78 if (*src != '\r') {
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79 put_htmlescaped(dest, *src);
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80 }
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81 src++;
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82 }
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83 cxBufferPut(dest, '\n');
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84 }
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85
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86 /* C Highlighter */
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87
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88 static const char* ckeywords[] = {
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89 "auto", "break", "case", "char", "const", "continue", "default", "do",
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90 "double", "else", "enum", "extern", "float", "for", "goto", "if", "int",
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91 "long", "register", "return", "short", "signed", "sizeof", "static",
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92 "struct", "switch", "typedef", "union", "unsigned", "void", "volatile",
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93 "while", NULL
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94 };
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95
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96 void c2html_c_highlighter(char const *src, CxBuffer *dest,
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97 c2html_highlighter_data *hd) {
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98 /* reset buffers without clearing them */
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99 hd->primary_buffer.size = hd->primary_buffer.pos = 0;
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100 hd->secondary_buffer.size = hd->secondary_buffer.pos = 0;
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101
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102 /* alias the buffers for better handling */
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103 CxBuffer *wbuf = &hd->primary_buffer;
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104 CxBuffer *ifilebuf = &hd->secondary_buffer;
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105
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106 /* local information */
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107 size_t sp = (size_t)-1;
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108
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109 int isstring = 0, iscomment = 0, isinclude = 0, parseinclude = 0;
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110 char quote = '\0';
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111 int isescaping = 0;
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112
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113 int continuation_enabled = 0;
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114 const char* current_highlight = NULL;
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115
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116 /* define convenience macros */
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117 #define start_span(cl) \
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118 current_highlight = cl; \
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119 cx_bprintf(dest, "<span class=\"c2html-%s\">", current_highlight)
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120 #define stop_span \
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121 current_highlight = NULL;\
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122 cxBufferPutString(dest, "</span>")
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123
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124 /* continue a multi line comment highlighting */
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125 if (hd->multiline_comment) {
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126 iscomment = 1;
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127 start_span("comment");
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128 }
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129
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130 /* continue highlighting in case of line continuation */
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131 if (hd->continue_highlight) {
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132 start_span(hd->continue_highlight);
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133 isinclude = hd->continuation_info & 0x1;
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134 isstring = (hd->continuation_info & 0x2) >> 1;
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135 iscomment = (hd->continuation_info & 0x4) >> 2;
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136 if (hd->continuation_info & 0x10) {
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137 quote = '\'';
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138 } else if (hd->continuation_info & 0x20) {
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139 quote = '\"';
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140 }
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141 hd->continue_highlight = NULL;
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142 hd->continuation_info = 0;
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143 }
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144
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145 char c;
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146 do {
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147 c = src[++sp];
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148 if (c == '\r') continue;
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149
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150 /* line continuation */
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151 if (c == '\\') {
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152 /* currently do not support continuations in user includes */
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153 // TODO: also support user includes
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154 if (!parseinclude) {
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155 continuation_enabled = 1;
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156 }
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157 } else if (continuation_enabled) {
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158 if (!isspace(c)) {
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159 continuation_enabled = 0;
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160 } else if (c == '\n') {
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161 cxBufferPut(dest, '\n');
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162 hd->continue_highlight = current_highlight;
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163 hd->continuation_info = \
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164 isinclude | \
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165 (isstring << 1) | \
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166 (iscomment << 2);
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167 if (quote == '\'') {
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168 hd->continuation_info |= 0x10;
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169 } else if (quote == '\"') {
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170 hd->continuation_info |= 0x20;
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171 }
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172 stop_span;
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173 continue;
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174 }
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175 }
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176
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177 /* comments */
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178 if (!isstring && c == '/') {
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179 if (hd->multiline_comment && sp > 0 && src[sp-1] == '*') {
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180 iscomment = 0;
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181 hd->multiline_comment = 0;
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182 cxBufferPut(dest, '/');
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183 stop_span;
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184 continue;
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185 } else if (!iscomment && (src[sp+1] == '/' || src[sp+1] == '*')) {
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186 iscomment = 1;
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187 hd->multiline_comment = (src[sp+1] == '*');
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188 start_span("comment");
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189 }
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190 }
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191
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192 if (iscomment) {
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193 if (c == '\n') {
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194 stop_span;
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195 cxBufferPut(dest, '\n');
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196 } else {
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197 put_htmlescaped(dest, c);
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198 }
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199 } else if (isinclude) {
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200 if (c == '<') {
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201 start_span("stdinclude");
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202 cxBufferPutString(dest, "&lt;");
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203 } else if (c == '\"') {
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204 if (parseinclude) {
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205 cxBufferPutString(dest, "\">");
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206 cxBufferWrite(ifilebuf->space, 1, ifilebuf->size, dest);
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207 cxBufferPutString(dest, "\"</a>");
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208 parseinclude = 0;
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209 } else {
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210 cxBufferPutString(dest,
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211 "<a class=\"c2html-userinclude\" href=\"");
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212 cxBufferPut(ifilebuf, '\"');
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213 parseinclude = 1;
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214 }
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215 } else if (c == '>') {
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216 cxBufferPutString(dest, "&gt;");
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217 stop_span;
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218 } else {
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219 if (parseinclude) {
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220 cxBufferPut(ifilebuf, c);
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221 }
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222 put_htmlescaped(dest, c);
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223 }
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224 } else {
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225 /* strings */
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226 if (!isescaping && (c == '\'' || c == '\"')) {
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227 if (isstring) {
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228 put_htmlescaped(dest, c);
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229 if (c == quote) {
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230 isstring = 0;
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231 stop_span;
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232 } else {
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233 put_htmlescaped(dest, c);
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234 }
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235 } else {
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236 isstring = 1;
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237 quote = c;
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238 start_span("string");
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239 put_htmlescaped(dest, c);
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240 }
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241 } else {
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242 if (isstring) {
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243 put_htmlescaped(dest, c);
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244 } else if (isalnum(c) || c == '_' || c == '#') {
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245 /* buffer the current word */
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246 cxBufferPut(wbuf, c);
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247 } else {
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248 /* write buffered word, if any */
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249 if (wbuf->size > 0) {
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250 cxstring word = cx_strn(wbuf->space, wbuf->size);
52
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251 int closespan = 1;
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252 cxstring typesuffix = CX_STR("_t");
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253 if (check_keyword(word, ckeywords)) {
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254 start_span("keyword");
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255 } else if (cx_strsuffix(word, typesuffix)) {
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256 start_span("type");
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257 } else if (word.ptr[0] == '#') {
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258 isinclude = !cx_strcmp(word, CX_STR("#include"));
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259 start_span("directive");
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260 } else if (check_capsonly(word)) {
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261 start_span("macroconst");
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262 } else {
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263 closespan = 0;
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264 }
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265 put_htmlescapedstr(dest, word);
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266 if (closespan) {
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267 stop_span;
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268 }
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269 }
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270 wbuf->pos = wbuf->size = 0; /* reset word buffer */
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271
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272 /* write current character */
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273 put_htmlescaped(dest, c);
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274 }
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275 }
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276
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277 isescaping = !isescaping & (c == '\\');
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278 }
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279 } while (c && c != '\n');
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280
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281 #undef start_span
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282 #undef stop_span
52
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283 }
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284
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285 /* Java Highlighter */
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286
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287 static const char* jkeywords[] = {
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288 "abstract", "continue", "for", "new", "switch", "assert", "default", "goto",
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289 "package", "synchronized", "boolean", "do", "if", "private", "this",
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290 "break", "double", "implements", "protected", "throw", "byte", "else",
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291 "import", "public", "throws", "case", "enum", "instanceof", "return",
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292 "transient", "catch", "extends", "int", "short", "try", "char", "final",
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293 "interface", "static", "void", "class", "finally", "long", "strictfp",
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294 "volatile", "const", "float", "native", "super", "while", NULL
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295 };
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296
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297 void c2html_java_highlighter(char const *src, CxBuffer *dest,
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298 c2html_highlighter_data *hd) {
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299 /* reset buffers without clearing them */
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300 hd->primary_buffer.size = hd->primary_buffer.pos = 0;
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301 hd->secondary_buffer.size = hd->secondary_buffer.pos = 0;
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302
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303 /* alias the buffers for better handling */
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304 CxBuffer *wbuf = &hd->primary_buffer;
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305
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306 /* local information */
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307 size_t sp = (size_t)-1;
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308 int isstring = 0, iscomment = 0, isimport = 0;
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309 char quote = '\0';
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310 int isescaping = 0;
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311
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312 if (hd->multiline_comment) {
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313 iscomment = 1;
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314 cxBufferPutString(dest, "<span class=\"c2html-comment\">");
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315 }
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316
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317 char c;
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318 do {
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319 c = src[++sp];
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320 if (c == '\r') continue;
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321
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322 /* comments */
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323 if (!isstring && c == '/') {
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324 if (hd->multiline_comment && sp > 0 && src[sp-1] == '*') {
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325 iscomment = 0;
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326 hd->multiline_comment = 0;
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327 cxBufferPutString(dest, "/</span>");
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328 continue;
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329 } else if (!iscomment && (src[sp+1] == '/' || src[sp+1] == '*')) {
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330 iscomment = 1;
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331 hd->multiline_comment = (src[sp+1] == '*');
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332 cxBufferPutString(dest, "<span class=\"c2html-comment\">");
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333 }
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334 }
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335
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336 if (iscomment) {
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337 if (c == '\n') {
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338 cxBufferPutString(dest, "</span>\n");
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339 } else {
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340 put_htmlescaped(dest, c);
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341 }
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342 } else if (isimport) {
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343 /* TODO: local imports */
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344 } else {
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345 /* strings */
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346 if (!isescaping && (c == '\'' || c == '\"')) {
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347 if (isstring) {
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348 put_htmlescaped(dest, c);
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349 if (c == quote) {
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350 isstring = 0;
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351 cxBufferPutString(dest, "</span>");
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352 } else {
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353 put_htmlescaped(dest, c);
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354 }
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355 } else {
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356 isstring = 1;
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357 quote = c;
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358 cxBufferPutString(dest,
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359 "<span class=\"c2html-string\">");
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360 put_htmlescaped(dest, c);
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361 }
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362 } else {
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363 if (isstring) {
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364 put_htmlescaped(dest, c);
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365 } else if (isalnum(c) || c == '_' || c == '@') {
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366 /* buffer the current word */
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367 cxBufferPut(wbuf, c);
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368 } else {
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369 /* write buffered word, if any */
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370 if (wbuf->size > 0) {
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371 cxstring word = cx_strn(wbuf->space, wbuf->size);
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372 int closespan = 1;
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373 if (check_keyword(word, jkeywords)) {
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374 cxBufferPutString(dest,
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375 "<span class=\"c2html-keyword\">");
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376 } else if (isupper(word.ptr[0])) {
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377 cxBufferPutString(dest,
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378 "<span class=\"c2html-type\">");
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379 } else if (word.ptr[0] == '@') {
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380 cxBufferPutString(dest,
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381 "<span class=\"c2html-directive\">");
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382 } else if (check_capsonly(word)) {
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383 cxBufferPutString(dest,
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384 "<span class=\"c2html-macroconst\">");
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385 } else {
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386 closespan = 0;
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387 }
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388 put_htmlescapedstr(dest, word);
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389
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390 if (closespan) {
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391 cxBufferPutString(dest, "</span>");
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392 }
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393 }
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394 wbuf->pos = wbuf->size = 0; /* reset buffer */
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395
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396 /* write current character */
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397 put_htmlescaped(dest, c);
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398 }
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399 }
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400
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401 isescaping = !isescaping & (c == '\\');
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402 }
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403 } while (c && c != '\n');
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404 }
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405

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