Add C support
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1 changed files with 276 additions and 39 deletions
315
nsh.c
315
nsh.c
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@ -1,47 +1,284 @@
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ctype.h>
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#define COLOR_RESET "\033[0m"
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#define COLOR_TEAL "\033[38;2;148;226;213m"
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#define COLOR_GREEN "\033[38;2;166;227;161m"
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#define COLOR_RED "\033[38;2;243;139;168m"
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#define COLOR_BLUE "\033[38;2;137;180;250m"
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#define COLOR_PEACH "\033[38;2;250;179;135m"
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#define COLOR_YELLOW "\033[38;2;249;226;175m"
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#define COLOR_OVERLAY0 "\033[38;2;108;112;134m"
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#define COLOR_RESET "\033[0m"
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#define COLOR_BLUE "\033[38;2;137;180;250m"
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#define COLOR_GREEN "\033[38;2;166;227;161m"
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#define COLOR_ORANGE "\033[38;2;250;179;135m"
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#define COLOR_OVERLAY0 "\033[38;2;108;112;134m"
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#define COLOR_TEAL "\033[38;2;148;226;213m"
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#define COLOR_MAUVE "\033[38;2;203;166;247m"
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#define COLOR_YELLOW "\033[38;2;249;226;175m"
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#define COLOR_SKY "\033[38;2;137;220;235m"
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#define COLOR_RED "\033[38;2;243;139;168m"
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#define COLOR_PEACH "\033[38;2;250;179;135m"
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#define MAX_LINE_LENGTH 1024
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const char *keywords[] = {
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"if", "else", "while", "for", "return", "switch", "case", "default", "break", "continue", "const", "#define", "#include", NULL
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};
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int main()
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const char *types[] = {
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"void", "int", "char", "float", "double", "long", "short", "unsigned", "signed", "struct", "enum", "union", NULL
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};
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/* Function declarations for different token handling */
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void highlight_keyword(const char *word);
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void highlight_type(const char *word);
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void highlight_function(const char *word);
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void highlight_string(const char *line, int *i);
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void highlight_char(const char *line, int *i);
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void highlight_single_comment(const char *line, int *i);
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void highlight_multi_comment(const char *line, int *i);
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/* Check if a word is a keyword */
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int is_keyword(const char *word)
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{
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char buffer[MAX_LINE_LENGTH];
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while (fgets(buffer, sizeof(buffer), stdin) != NULL) {
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/* Remove newline from buffer, if present */
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size_t len = strlen(buffer);
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if (len > 0 && buffer[len - 1] == '\n') {
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buffer[len - 1] = '\0';
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}
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if (strncmp(buffer, "---", 3) == 0) {
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printf(COLOR_YELLOW "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "+++", 3) == 0) {
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printf(COLOR_PEACH "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "@@", 2) == 0) {
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printf(COLOR_OVERLAY0 "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "index", 5) == 0) {
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printf(COLOR_TEAL "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "diff", 4) == 0) {
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printf(COLOR_BLUE "%s" COLOR_RESET "\n", buffer);
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} else if (buffer[0] == '+') {
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printf(COLOR_GREEN "%s" COLOR_RESET "\n", buffer);
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} else if (buffer[0] == '-') {
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printf(COLOR_RED "%s" COLOR_RESET "\n", buffer);
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} else {
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printf("%s\n", buffer);
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}
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}
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return 0;
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for (int i = 0; keywords[i] != NULL; i++) {
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if (strcmp(word, keywords[i]) == 0) {
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return 1;
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}
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}
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return 0;
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}
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/* Check if a word is a type */
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int is_type(const char *word)
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{
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for (int i = 0; types[i] != NULL; i++) {
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if (strcmp(word, types[i]) == 0) {
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return 1;
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}
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}
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return 0;
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}
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/* Function to handle and highlight keywords */
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void highlight_keyword(const char *word)
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{
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printf(COLOR_MAUVE "%s" COLOR_RESET, word);
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}
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/* Function to handle and highlight types */
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void highlight_type(const char *word)
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{
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printf(COLOR_YELLOW "%s" COLOR_RESET, word);
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}
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/* Function to handle and highlight function names */
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void highlight_function(const char *word)
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{
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printf(COLOR_BLUE "%s" COLOR_RESET, word);
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}
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void highlight_symbol(const char *word)
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{
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printf(COLOR_SKY "%s" COLOR_RESET, word);
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}
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void highlight_number(const char *word)
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{
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printf(COLOR_ORANGE "%s" COLOR_RESET, word);
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}
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void highlight_normal(const char *word)
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{
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int is_constant = 1;
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for (int i = 0; i < strlen(word); i++) {
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if (word[i] == '_') continue;
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if (word[i] > 'a' && word[i] < 'z') {
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is_constant = 0;
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}
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}
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if (is_constant) {
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printf(COLOR_ORANGE "%s" COLOR_RESET, word);
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} else {
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printf("%s", word);
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}
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}
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void highlight_brackets(const char *word)
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{
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printf(COLOR_RED "%s" COLOR_RESET, word);
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}
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/* Function to handle and highlight single-line comments */
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void highlight_single_comment(const char *line, int *i)
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{
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printf(COLOR_OVERLAY0 "//");
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(*i) += 2;
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while (line[*i] != '\0') {
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printf("%c", line[*i]);
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(*i)++;
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}
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printf(COLOR_RESET);
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}
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/* Function to handle and highlight multi-line comments */
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void highlight_multi_comment(const char *line, int *i)
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{
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printf(COLOR_OVERLAY0 "/*");
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(*i) += 2;
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while (!(line[*i] == '*' && line[*i + 1] == '/') && line[*i] != '\0') {
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printf("%c", line[*i]);
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(*i)++;
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}
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if (line[*i] == '*' && line[*i + 1] == '/') {
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printf("*/" COLOR_RESET);
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(*i) += 2;
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}
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}
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/* Function to handle and highlight character literals */
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void highlight_char(const char *line, int *i)
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{
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printf(COLOR_TEAL "'");
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(*i)++;
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while (line[*i] != '\'' && line[*i] != '\0') {
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if (line[*i] == '\\' && (line[*i + 1] == '\'' || line[*i + 1] == '\\')) {
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printf("%c%c", line[*i], line[*i + 1]); // Handle escape sequences
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(*i) += 2;
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} else {
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printf("%c", line[*i]);
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(*i)++;
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}
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}
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if (line[*i] == '\'') {
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printf("'" COLOR_RESET); // Print closing single quote and reset color
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}
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}
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/* Function to handle and highlight string literals */
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void highlight_string(const char *line, int *i)
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{
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printf(COLOR_GREEN "\""); // Print opening quote in green
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(*i)++;
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while (line[*i] != '"' && line[*i] != '\0') {
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if (line[*i] == '\\' && (line[*i + 1] == '"' || line[*i + 1] == '\\')) {
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printf("%c%c", line[*i], line[*i + 1]); // Print the escape character and the next character
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(*i) += 2; // Move past the escape character and the next character
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} else {
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printf("%c", line[*i]);
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(*i)++;
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}
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}
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if (line[*i] == '"') {
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printf("\"" COLOR_RESET); // Print the closing quote and reset color
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}
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}
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/* Main function to process input */
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int main(int argc, char **argv)
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{
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if (argc < 2) {
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fprintf(stderr, "nsh <file> <file2> ...\n");
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exit(1);
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}
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for (int i = 1; i < argc; i++) {
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FILE *f = fopen(argv[i], "r");
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if (!f) {
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fprintf(stderr, "Unable to open file: %s\n", argv[i]);
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exit(1);
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}
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/* handle file without extension
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* ext is the extension if . exist in filename, otherwise nothing */
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char *ext = strrchr(argv[i], '.');
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if (ext != NULL) {
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/* how to identify file type if there isn't extension? */
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ext++;
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}
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char buffer[1024];
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char word[256];
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int word_len = 0;
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while (fgets(buffer, sizeof(buffer), f) != NULL) {
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if (ext && strcmp(ext, "c") == 0) {
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for (int i = 0; buffer[i] != '\0'; i++) {
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if (buffer[i] == '\'') {
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highlight_char(buffer, &i);
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continue;
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}
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if (buffer[i] == '"') {
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highlight_string(buffer, &i);
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continue;
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}
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if (buffer[i] == '/' && buffer[i+1] == '/') {
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highlight_single_comment(buffer, &i);
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break;
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}
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if (buffer[i] == '/' && buffer[i+1] == '*') {
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highlight_multi_comment(buffer, &i);
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}
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if (isspace(buffer[i]) || (ispunct(buffer[i]) && buffer[i] != '_' && buffer[i] != '#')) {
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if (word_len > 0 && buffer[i] != '*' && buffer[i] != '&' && buffer[i] != '=' && buffer[i] != '+' && buffer[i] != '|') {
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word[word_len] = '\0';
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if (buffer[i] == '(' && !is_keyword(word) && !is_type(word)) {
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highlight_function(word); // Highlight function if it’s not a keyword or type
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} else if (is_type(word)) {
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highlight_type(word); // Highlight types correctly
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} else if (is_keyword(word)) {
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highlight_keyword(word); // Highlight keywords or other words
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} else {
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highlight_normal(word);
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}
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word_len = 0;
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}
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if (buffer[i] == '[' || buffer[i] == ']' || buffer[i] == '(' || buffer[i] == ')' || buffer[i] == '{' || buffer[i] == '}') {
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word[word_len++] = buffer[i];
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word[word_len] = '\0';
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highlight_brackets(word);
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word_len = 0;
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continue;
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}
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if (buffer[i] == '*' || buffer[i] == '&' || buffer[i] == '=' || buffer[i] == '+' || buffer[i] == '|') {
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word[word_len++] = buffer[i];
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if (buffer[i+1] != '*' && buffer[i+1] != '&' && buffer[i+1] != '=' && buffer[i+1] != '+' && buffer[i+1] != '|') {
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word[word_len] = '\0';
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highlight_symbol(word);
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word_len = 0;
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}
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continue;
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}
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printf("%c", buffer[i]);
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} else if (isdigit(buffer[i]) ) {
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word[word_len++] = buffer[i];
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if (isdigit(buffer[i+1]) == 0) {
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word[word_len] = '\0';
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highlight_number(word);
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word_len = 0;
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}
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} else {
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word[word_len++] = buffer[i];
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}
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}
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} else {
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/* Remove newline from buffer, if present */
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size_t len = strlen(buffer);
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if (len > 0 && buffer[len - 1] == '\n') {
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buffer[len - 1] = '\0';
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}
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if (strncmp(buffer, "---", 3) == 0) {
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printf(COLOR_YELLOW "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "+++", 3) == 0) {
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printf(COLOR_PEACH "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "@@", 2) == 0) {
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printf(COLOR_OVERLAY0 "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "index", 5) == 0) {
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printf(COLOR_TEAL "%s" COLOR_RESET "\n", buffer);
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} else if (strncmp(buffer, "diff", 4) == 0) {
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printf(COLOR_BLUE "%s" COLOR_RESET "\n", buffer);
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} else if (buffer[0] == '+') {
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printf(COLOR_GREEN "%s" COLOR_RESET "\n", buffer);
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} else if (buffer[0] == '-') {
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printf(COLOR_RED "%s" COLOR_RESET "\n", buffer);
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} else {
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printf("%s\n", buffer);
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}
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}
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}
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}
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return 0;
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}
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