src/highlighter.c

Thu, 11 Jul 2024 20:05:26 +0200

author
Mike Becker <universe@uap-core.de>
date
Thu, 11 Jul 2024 20:05:26 +0200
changeset 81
9e483a0e3f52
parent 80
0f1c55d2a90a
permissions
-rw-r--r--

Added tag v3.1 for changeset 0f1c55d2a90a

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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 cxBufferPutString(dest, "&amp;");
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45 } else if (c) {
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46 cxBufferPut(dest, c);
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47 }
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48 }
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49
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50 static void put_htmlescapedstr(CxBuffer *dest, cxstring s) {
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51 for (int i = 0 ; i < s.length ; i++) {
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52 put_htmlescaped(dest, s.ptr[i]);
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53 }
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54 }
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55
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56 static int check_keyword(cxstring word, const char** keywords) {
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57 for (int i = 0 ; keywords[i] ; i++) {
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58 if (cx_strcmp(word, cx_str(keywords[i])) == 0) {
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59 return 1;
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60 }
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61 }
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62 return 0;
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63 }
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64
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65 static int check_capsonly(cxstring word) {
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66 for (size_t i = 0 ; i < word.length ; i++) {
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67 if (!isupper(word.ptr[i]) && !isdigit(word.ptr[i])
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68 && word.ptr[i] != '_') {
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69 return 0;
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70 }
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71 }
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72 return 1;
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73 }
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74
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75 /* Plaintext Highlighter */
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76
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77 void c2html_plain_highlighter(char const *src, CxBuffer *dest,
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78 c2html_highlighter_data *hd) {
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79 while (*src && *src != '\n') {
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80 if (*src != '\r') {
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81 put_htmlescaped(dest, *src);
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82 }
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83 src++;
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84 }
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85 cxBufferPut(dest, '\n');
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86 }
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87
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88 /* C Highlighter */
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89
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90 static const char* ckeywords[] = {
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91 "auto", "break", "case", "char", "const", "continue", "default", "do",
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92 "double", "else", "enum", "extern", "float", "for", "goto", "if", "int",
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93 "long", "register", "return", "short", "signed", "sizeof", "static",
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94 "struct", "switch", "typedef", "union", "unsigned", "void", "volatile",
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95 "while", NULL
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96 };
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97
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98 void c2html_c_highlighter(char const *src, CxBuffer *dest,
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99 c2html_highlighter_data *hd) {
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100 /* reset buffers without clearing them */
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101 hd->primary_buffer.size = hd->primary_buffer.pos = 0;
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102 hd->secondary_buffer.size = hd->secondary_buffer.pos = 0;
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103
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104 /* alias the buffers for better handling */
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105 CxBuffer *wbuf = &hd->primary_buffer;
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106 CxBuffer *ifilebuf = &hd->secondary_buffer;
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107
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108 /* local information */
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109 size_t sp = (size_t)-1;
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110
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111 int isstring = 0, iscomment = 0, isinclude = 0, parseinclude = 0;
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112 char quote = '\0';
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113 int isescaping = 0;
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114
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115 int continuation_enabled = 0;
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116 const char* current_highlight = NULL;
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117
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118 /* define convenience macros */
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119 #define start_span(cl) \
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120 current_highlight = cl; \
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121 cx_bprintf(dest, "<span class=\"c2html-%s\">", current_highlight)
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122 #define stop_span \
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123 current_highlight = NULL;\
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124 cxBufferPutString(dest, "</span>")
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125
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126 /* continue a multi line comment highlighting */
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127 if (hd->multiline_comment) {
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128 iscomment = 1;
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129 start_span("comment");
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130 }
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131
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132 /* continue highlighting in case of line continuation */
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133 if (hd->continue_highlight) {
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134 start_span(hd->continue_highlight);
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135 isinclude = hd->continuation_info & 0x1;
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136 isstring = (hd->continuation_info & 0x2) >> 1;
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137 iscomment = (hd->continuation_info & 0x4) >> 2;
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138 if (hd->continuation_info & 0x10) {
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139 quote = '\'';
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140 } else if (hd->continuation_info & 0x20) {
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141 quote = '\"';
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142 }
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143 hd->continue_highlight = NULL;
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144 hd->continuation_info = 0;
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145 }
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146
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147 char c;
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148 do {
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149 c = src[++sp];
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150 if (c == '\r') continue;
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151
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152 /* line continuation */
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153 if (c == '\\') {
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154 /* currently do not support continuations in user includes */
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155 // TODO: also support user includes
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156 if (!parseinclude) {
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157 continuation_enabled = 1;
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158 }
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159 } else if (continuation_enabled) {
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160 if (!isspace(c)) {
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161 continuation_enabled = 0;
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162 } else if (c == '\n') {
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163 cxBufferPut(dest, '\n');
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164 hd->continue_highlight = current_highlight;
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165 hd->continuation_info = \
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166 isinclude | \
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167 (isstring << 1) | \
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168 (iscomment << 2);
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169 if (quote == '\'') {
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170 hd->continuation_info |= 0x10;
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171 } else if (quote == '\"') {
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172 hd->continuation_info |= 0x20;
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173 }
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174 stop_span;
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175 continue;
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176 }
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177 }
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178
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179 /* comments */
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180 if (!isstring && c == '/') {
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181 if (hd->multiline_comment && sp > 0 && src[sp-1] == '*') {
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182 iscomment = 0;
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183 hd->multiline_comment = 0;
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184 cxBufferPut(dest, '/');
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185 stop_span;
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186 continue;
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187 } else if (!iscomment && (src[sp+1] == '/' || src[sp+1] == '*')) {
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188 iscomment = 1;
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189 hd->multiline_comment = (src[sp+1] == '*');
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190 start_span("comment");
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191 }
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192 }
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193
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194 if (iscomment) {
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195 if (c == '\n') {
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196 stop_span;
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197 cxBufferPut(dest, '\n');
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198 } else {
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199 put_htmlescaped(dest, c);
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200 }
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201 } else if (isinclude) {
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202 if (c == '<') {
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203 start_span("stdinclude");
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204 cxBufferPutString(dest, "&lt;");
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205 } else if (c == '\"') {
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206 if (parseinclude) {
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207 cxBufferPutString(dest, "\">");
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208 cxBufferWrite(ifilebuf->space, 1, ifilebuf->size, dest);
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209 cxBufferPutString(dest, "\"</a>");
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210 parseinclude = 0;
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211 } else {
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212 cxBufferPutString(dest,
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213 "<a class=\"c2html-userinclude\" href=\"");
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214 cxBufferPut(ifilebuf, '\"');
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215 parseinclude = 1;
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216 }
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217 } else if (c == '>') {
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218 cxBufferPutString(dest, "&gt;");
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219 stop_span;
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220 } else {
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221 if (parseinclude) {
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222 cxBufferPut(ifilebuf, c);
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223 }
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224 put_htmlescaped(dest, c);
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225 }
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226 } else {
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227 /* strings */
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228 if (!isescaping && (c == '\'' || c == '\"')) {
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229 if (isstring) {
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230 put_htmlescaped(dest, c);
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231 if (c == quote) {
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232 isstring = 0;
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233 stop_span;
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234 } else {
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235 put_htmlescaped(dest, c);
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236 }
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237 } else {
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238 isstring = 1;
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239 quote = c;
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240 start_span("string");
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241 put_htmlescaped(dest, c);
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242 }
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243 } else {
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244 if (isstring) {
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245 put_htmlescaped(dest, c);
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246 } else if (isalnum(c) || c == '_' || c == '#') {
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247 /* buffer the current word */
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248 cxBufferPut(wbuf, c);
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249 } else {
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250 /* write buffered word, if any */
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251 if (wbuf->size > 0) {
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252 cxstring word = cx_strn(wbuf->space, wbuf->size);
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253 int closespan = 1;
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254 cxstring typesuffix = CX_STR("_t");
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255 if (check_keyword(word, ckeywords)) {
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256 start_span("keyword");
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257 } else if (cx_strsuffix(word, typesuffix)) {
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258 start_span("type");
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259 } else if (word.ptr[0] == '#') {
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260 isinclude = !cx_strcmp(word, CX_STR("#include"));
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261 start_span("directive");
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262 } else if (check_capsonly(word)) {
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263 start_span("macroconst");
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264 } else {
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265 closespan = 0;
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266 }
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267 put_htmlescapedstr(dest, word);
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268 if (closespan) {
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269 stop_span;
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270 }
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271 }
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272 wbuf->pos = wbuf->size = 0; /* reset word buffer */
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273
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274 /* write current character */
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275 put_htmlescaped(dest, c);
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276 }
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277 }
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278
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279 isescaping = !isescaping & (c == '\\');
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280 }
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281 } while (c && c != '\n');
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282
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283 #undef start_span
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284 #undef stop_span
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285 }
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286
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287 /* Java Highlighter */
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288
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289 static const char* jkeywords[] = {
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290 "abstract", "continue", "for", "new", "switch", "assert", "default", "goto",
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291 "package", "synchronized", "boolean", "do", "if", "private", "this",
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292 "break", "double", "implements", "protected", "throw", "byte", "else",
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293 "import", "public", "throws", "case", "enum", "instanceof", "return",
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294 "transient", "catch", "extends", "int", "short", "try", "char", "final",
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295 "interface", "static", "void", "class", "finally", "long", "strictfp",
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296 "volatile", "const", "float", "native", "super", "while", NULL
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297 };
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298
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299 void c2html_java_highlighter(char const *src, CxBuffer *dest,
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300 c2html_highlighter_data *hd) {
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301 /* reset buffers without clearing them */
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302 hd->primary_buffer.size = hd->primary_buffer.pos = 0;
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303 hd->secondary_buffer.size = hd->secondary_buffer.pos = 0;
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304
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305 /* alias the buffers for better handling */
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306 CxBuffer *wbuf = &hd->primary_buffer;
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307
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308 /* local information */
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309 size_t sp = (size_t)-1;
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310 int isstring = 0, iscomment = 0, isimport = 0;
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311 char quote = '\0';
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312 int isescaping = 0;
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313
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314 if (hd->multiline_comment) {
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315 iscomment = 1;
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316 cxBufferPutString(dest, "<span class=\"c2html-comment\">");
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317 }
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318
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319 char c;
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320 do {
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321 c = src[++sp];
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322 if (c == '\r') continue;
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323
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324 /* comments */
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325 if (!isstring && c == '/') {
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326 if (hd->multiline_comment && sp > 0 && src[sp-1] == '*') {
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327 iscomment = 0;
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328 hd->multiline_comment = 0;
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329 cxBufferPutString(dest, "/</span>");
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330 continue;
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331 } else if (!iscomment && (src[sp+1] == '/' || src[sp+1] == '*')) {
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332 iscomment = 1;
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333 hd->multiline_comment = (src[sp+1] == '*');
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334 cxBufferPutString(dest, "<span class=\"c2html-comment\">");
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335 }
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336 }
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337
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338 if (iscomment) {
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339 if (c == '\n') {
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340 cxBufferPutString(dest, "</span>\n");
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341 } else {
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342 put_htmlescaped(dest, c);
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343 }
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344 } else if (isimport) {
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345 /* TODO: local imports */
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346 } else {
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347 /* strings */
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348 if (!isescaping && (c == '\'' || c == '\"')) {
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349 if (isstring) {
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350 put_htmlescaped(dest, c);
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351 if (c == quote) {
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352 isstring = 0;
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353 cxBufferPutString(dest, "</span>");
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354 } else {
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355 put_htmlescaped(dest, c);
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356 }
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357 } else {
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358 isstring = 1;
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359 quote = c;
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360 cxBufferPutString(dest,
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361 "<span class=\"c2html-string\">");
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362 put_htmlescaped(dest, c);
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363 }
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364 } else {
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365 if (isstring) {
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366 put_htmlescaped(dest, c);
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367 } else if (isalnum(c) || c == '_' || c == '@') {
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368 /* buffer the current word */
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369 cxBufferPut(wbuf, c);
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370 } else {
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371 /* write buffered word, if any */
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372 if (wbuf->size > 0) {
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373 cxstring word = cx_strn(wbuf->space, wbuf->size);
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374 int closespan = 1;
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375 if (check_keyword(word, jkeywords)) {
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376 cxBufferPutString(dest,
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377 "<span class=\"c2html-keyword\">");
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378 } else if (isupper(word.ptr[0])) {
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379 cxBufferPutString(dest,
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380 "<span class=\"c2html-type\">");
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381 } else if (word.ptr[0] == '@') {
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382 cxBufferPutString(dest,
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383 "<span class=\"c2html-directive\">");
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384 } else if (check_capsonly(word)) {
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385 cxBufferPutString(dest,
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386 "<span class=\"c2html-macroconst\">");
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387 } else {
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388 closespan = 0;
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389 }
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390 put_htmlescapedstr(dest, word);
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391
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392 if (closespan) {
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393 cxBufferPutString(dest, "</span>");
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394 }
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395 }
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396 wbuf->pos = wbuf->size = 0; /* reset buffer */
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397
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398 /* write current character */
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399 put_htmlescaped(dest, c);
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400 }
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401 }
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402
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403 isescaping = !isescaping & (c == '\\');
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404 }
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405 } while (c && c != '\n');
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406 }
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407

mercurial