Kyle Isom
d15b241140
- Moved all language highlighter implementations (`CppHighlighter`, `GoHighlighter`, `JsonHighlighter`, etc.), the engine, and registry to `syntax/`.
90 lines
2.0 KiB
C++
90 lines
2.0 KiB
C++
#include "JsonHighlighter.h"
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#include "../Buffer.h"
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#include <cctype>
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namespace kte {
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static bool
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is_digit(char c)
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{
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return c >= '0' && c <= '9';
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}
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void
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JSONHighlighter::HighlightLine(const Buffer &buf, int row, std::vector<HighlightSpan> &out) const
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{
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const auto &rows = buf.Rows();
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if (row < 0 || static_cast<std::size_t>(row) >= rows.size())
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return;
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std::string s = static_cast<std::string>(rows[static_cast<std::size_t>(row)]);
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int n = static_cast<int>(s.size());
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auto push = [&](int a, int b, TokenKind k) {
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if (b > a)
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out.push_back({a, b, k});
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};
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int i = 0;
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while (i < n) {
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char c = s[i];
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if (c == ' ' || c == '\t') {
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int j = i + 1;
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while (j < n && (s[j] == ' ' || s[j] == '\t'))
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++j;
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push(i, j, TokenKind::Whitespace);
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i = j;
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continue;
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}
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if (c == '"') {
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int j = i + 1;
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bool esc = false;
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while (j < n) {
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char d = s[j++];
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if (esc) {
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esc = false;
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continue;
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}
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if (d == '\\') {
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esc = true;
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continue;
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}
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if (d == '"')
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break;
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}
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push(i, j, TokenKind::String);
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i = j;
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continue;
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}
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if (is_digit(c) || (c == '-' && i + 1 < n && is_digit(s[i + 1]))) {
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int j = i + 1;
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while (j < n && (std::isdigit(static_cast<unsigned char>(s[j])) || s[j] == '.' || s[j] == 'e' ||
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s[j] == 'E' || s[j] == '+' || s[j] == '-' || s[j] == '_'))
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++j;
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push(i, j, TokenKind::Number);
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i = j;
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continue;
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}
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// booleans/null
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if (std::isalpha(static_cast<unsigned char>(c))) {
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int j = i + 1;
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while (j < n && std::isalpha(static_cast<unsigned char>(s[j])))
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++j;
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std::string id = s.substr(i, j - i);
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if (id == "true" || id == "false" || id == "null")
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push(i, j, TokenKind::Constant);
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else
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push(i, j, TokenKind::Identifier);
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i = j;
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continue;
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}
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// punctuation
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if (c == '{' || c == '}' || c == '[' || c == ']' || c == ',' || c == ':') {
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push(i, i + 1, TokenKind::Punctuation);
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++i;
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continue;
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}
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// fallback
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push(i, i + 1, TokenKind::Default);
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++i;
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}
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}
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} // namespace kte
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