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404 lines
13 KiB
C++
404 lines
13 KiB
C++
#include "lex_utils.h"
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#include <doctest/doctest.h>
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#include <algorithm>
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#include <iostream>
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// VSCode (UTF-16) disagrees with Emacs lsp-mode (UTF-8) on how to represent
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// text documents.
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// We use a UTF-8 iterator to approximate UTF-16 in the specification (weird).
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// This is good enough and fails only for UTF-16 surrogate pairs.
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int GetOffsetForPosition(lsPosition position, std::string_view content) {
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size_t i = 0;
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for (; position.line > 0 && i < content.size(); i++)
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if (content[i] == '\n')
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position.line--;
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for (; position.character > 0 && i < content.size(); position.character--)
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if (uint8_t(content[i++]) >= 128) {
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// Skip 0b10xxxxxx
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while (i < content.size() && uint8_t(content[i]) >= 128 &&
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uint8_t(content[i]) < 192)
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i++;
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}
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return int(i);
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}
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lsPosition CharPos(std::string_view search,
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char character,
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int character_offset) {
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lsPosition result;
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size_t index = 0;
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while (index < search.size()) {
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char c = search[index];
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if (c == character)
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break;
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if (c == '\n') {
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result.line += 1;
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result.character = 0;
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} else {
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result.character += 1;
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}
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++index;
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}
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assert(index < search.size());
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result.character += character_offset;
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return result;
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}
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// TODO: eliminate |line_number| param.
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optional<lsRange> ExtractQuotedRange(int line_number, const std::string& line) {
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// Find starting and ending quote.
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int start = 0;
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while (start < (int)line.size()) {
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char c = line[start];
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++start;
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if (c == '"' || c == '<')
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break;
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}
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if (start == (int)line.size())
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return nullopt;
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int end = (int)line.size();
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while (end > 0) {
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char c = line[end];
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if (c == '"' || c == '>')
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break;
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--end;
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}
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if (start >= end)
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return nullopt;
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return lsRange(lsPosition(line_number, start), lsPosition(line_number, end));
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}
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void LexFunctionDeclaration(const std::string& buffer_content,
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lsPosition declaration_spelling,
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optional<std::string> type_name,
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std::string* insert_text,
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int* newlines_after_name) {
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int name_start = GetOffsetForPosition(declaration_spelling, buffer_content);
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bool parse_return_type = true;
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// We need to check if we have a return type (ctors and dtors do not).
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if (type_name) {
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int name_end = name_start;
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while (name_end < buffer_content.size()) {
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char c = buffer_content[name_end];
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if (isspace(c) || c == '(')
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break;
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++name_end;
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}
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std::string func_name =
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buffer_content.substr(name_start, name_end - name_start);
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if (func_name == *type_name || func_name == ("~" + *type_name))
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parse_return_type = false;
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}
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// We need to fetch the return type. This can get complex, ie,
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//
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// std::vector <int> foo();
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//
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int return_start = name_start;
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if (parse_return_type) {
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int paren_balance = 0;
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int angle_balance = 0;
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bool expect_token = true;
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while (return_start > 0) {
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char c = buffer_content[return_start - 1];
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if (paren_balance == 0 && angle_balance == 0) {
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if (isspace(c) && !expect_token) {
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break;
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}
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if (!isspace(c))
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expect_token = false;
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}
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if (c == ')')
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++paren_balance;
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if (c == '(') {
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--paren_balance;
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expect_token = true;
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}
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if (c == '>')
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++angle_balance;
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if (c == '<') {
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--angle_balance;
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expect_token = true;
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}
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return_start -= 1;
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}
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}
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// We need to fetch the arguments. Just scan for the next ';'.
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*newlines_after_name = 0;
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int end = name_start;
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while (end < buffer_content.size()) {
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char c = buffer_content[end];
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if (c == ';')
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break;
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if (c == '\n')
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*newlines_after_name += 1;
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++end;
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}
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std::string result;
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result += buffer_content.substr(return_start, name_start - return_start);
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if (type_name && !type_name->empty())
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result += *type_name + "::";
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result += buffer_content.substr(name_start, end - name_start);
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TrimEndInPlace(result);
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result += " {\n}";
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*insert_text = result;
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}
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std::string_view LexIdentifierAroundPos(lsPosition position,
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std::string_view content) {
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int start = GetOffsetForPosition(position, content);
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int end = start + 1;
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char c;
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// We search for :: before the cursor but not after to get the qualifier.
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for (; start > 0; start--) {
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c = content[start - 1];
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if (isalnum(c) || c == '_')
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;
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else if (c == ':' && start > 1 && content[start - 2] == ':')
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start--;
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else
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break;
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}
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for (; end < (int)content.size(); end++)
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if (c = content[end], !(isalnum(c) || c == '_'))
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break;
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return content.substr(start, end - start);
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}
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bool SubsequenceMatchIgnoreCase(std::string_view search, std::string_view content) {
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size_t j = 0;
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for (size_t i = 0; i < search.size(); i++) {
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char search_char = tolower(search[i]);
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while (j < content.size() && tolower(content[j]) != search_char)
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j++;
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if (j == content.size())
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return false;
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j++;
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}
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return true;
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}
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// Find discontinous |search| in |content|.
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// Return |found| and the count of skipped chars before found.
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std::tuple<bool, int> SubsequenceCountSkip(std::string_view search,
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std::string_view content) {
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bool hasUppercaseLetter = std::any_of(search.begin(), search.end(), isupper);
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int skip = 0;
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size_t j = 0;
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for (char c : search) {
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while (j < content.size() &&
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(hasUppercaseLetter ? content[j] != c
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: tolower(content[j]) != tolower(c)))
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++j, ++skip;
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if (j == content.size())
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return std::make_tuple(false, skip);
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++j;
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}
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return std::make_tuple(true, skip);
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}
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TEST_SUITE("Offset") {
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TEST_CASE("past end") {
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std::string content = "foo";
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int offset = GetOffsetForPosition(lsPosition(10, 10), content);
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REQUIRE(offset <= content.size());
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}
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TEST_CASE("in middle of content") {
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std::string content = "abcdefghijk";
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for (int i = 0; i < content.size(); ++i) {
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int offset = GetOffsetForPosition(lsPosition(0, i), content);
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REQUIRE(i == offset);
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}
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}
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TEST_CASE("at end of content") {
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REQUIRE(GetOffsetForPosition(lsPosition(0, 0), "") == 0);
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REQUIRE(GetOffsetForPosition(lsPosition(0, 1), "a") == 1);
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}
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}
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TEST_SUITE("Substring") {
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TEST_CASE("match") {
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// Empty string matches anything.
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REQUIRE(SubsequenceMatchIgnoreCase("", ""));
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REQUIRE(SubsequenceMatchIgnoreCase("", "aa"));
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// Match in start/middle/end.
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REQUIRE(SubsequenceMatchIgnoreCase("a", "abbbb"));
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REQUIRE(SubsequenceMatchIgnoreCase("a", "bbabb"));
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REQUIRE(SubsequenceMatchIgnoreCase("a", "bbbba"));
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REQUIRE(SubsequenceMatchIgnoreCase("aa", "aabbb"));
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REQUIRE(SubsequenceMatchIgnoreCase("aa", "bbaab"));
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REQUIRE(SubsequenceMatchIgnoreCase("aa", "bbbaa"));
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// Capitalization.
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REQUIRE(SubsequenceMatchIgnoreCase("aa", "aA"));
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REQUIRE(SubsequenceMatchIgnoreCase("aa", "Aa"));
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REQUIRE(SubsequenceMatchIgnoreCase("aa", "AA"));
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// Token skipping.
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REQUIRE(SubsequenceMatchIgnoreCase("ad", "abcd"));
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REQUIRE(SubsequenceMatchIgnoreCase("ad", "ABCD"));
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// Ordering.
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REQUIRE(!SubsequenceMatchIgnoreCase("ad", "dcba"));
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}
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TEST_CASE("skip") {
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REQUIRE(SubsequenceCountSkip("a", "a") == std::make_tuple(true, 0));
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REQUIRE(SubsequenceCountSkip("b", "a") == std::make_tuple(false, 1));
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REQUIRE(SubsequenceCountSkip("", "") == std::make_tuple(true, 0));
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REQUIRE(SubsequenceCountSkip("a", "ba") == std::make_tuple(true, 1));
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REQUIRE(SubsequenceCountSkip("aa", "aba") == std::make_tuple(true, 1));
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REQUIRE(SubsequenceCountSkip("aa", "baa") == std::make_tuple(true, 1));
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REQUIRE(SubsequenceCountSkip("aA", "aA") == std::make_tuple(true, 0));
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REQUIRE(SubsequenceCountSkip("aA", "aa") == std::make_tuple(false, 1));
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REQUIRE(SubsequenceCountSkip("incstdioh", "include <stdio.h>") ==
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std::make_tuple(true, 7));
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}
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}
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TEST_SUITE("LexFunctionDeclaration") {
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TEST_CASE("simple") {
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std::string buffer_content = " void Foo(); ";
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lsPosition declaration = CharPos(buffer_content, 'F');
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std::string insert_text;
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int newlines_after_name = 0;
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LexFunctionDeclaration(buffer_content, declaration, nullopt, &insert_text,
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&newlines_after_name);
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REQUIRE(insert_text == "void Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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LexFunctionDeclaration(buffer_content, declaration, std::string("Type"),
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&insert_text, &newlines_after_name);
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REQUIRE(insert_text == "void Type::Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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}
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TEST_CASE("ctor") {
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std::string buffer_content = " Foo(); ";
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lsPosition declaration = CharPos(buffer_content, 'F');
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std::string insert_text;
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int newlines_after_name = 0;
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LexFunctionDeclaration(buffer_content, declaration, std::string("Foo"),
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&insert_text, &newlines_after_name);
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REQUIRE(insert_text == "Foo::Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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}
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TEST_CASE("dtor") {
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std::string buffer_content = " ~Foo(); ";
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lsPosition declaration = CharPos(buffer_content, '~');
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std::string insert_text;
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int newlines_after_name = 0;
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LexFunctionDeclaration(buffer_content, declaration, std::string("Foo"),
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&insert_text, &newlines_after_name);
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REQUIRE(insert_text == "Foo::~Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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}
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TEST_CASE("complex return type") {
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std::string buffer_content = " std::vector<int> Foo(); ";
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lsPosition declaration = CharPos(buffer_content, 'F');
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std::string insert_text;
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int newlines_after_name = 0;
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LexFunctionDeclaration(buffer_content, declaration, nullopt, &insert_text,
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&newlines_after_name);
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REQUIRE(insert_text == "std::vector<int> Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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LexFunctionDeclaration(buffer_content, declaration, std::string("Type"),
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&insert_text, &newlines_after_name);
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REQUIRE(insert_text == "std::vector<int> Type::Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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}
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TEST_CASE("extra complex return type") {
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std::string buffer_content = " std::function < int() > \n Foo(); ";
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lsPosition declaration = CharPos(buffer_content, 'F');
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std::string insert_text;
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int newlines_after_name = 0;
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LexFunctionDeclaration(buffer_content, declaration, nullopt, &insert_text,
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&newlines_after_name);
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REQUIRE(insert_text == "std::function < int() > \n Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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LexFunctionDeclaration(buffer_content, declaration, std::string("Type"),
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&insert_text, &newlines_after_name);
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REQUIRE(insert_text == "std::function < int() > \n Type::Foo() {\n}");
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REQUIRE(newlines_after_name == 0);
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}
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TEST_CASE("parameters") {
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std::string buffer_content = "void Foo(int a,\n\n int b); ";
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lsPosition declaration = CharPos(buffer_content, 'F');
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std::string insert_text;
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int newlines_after_name = 0;
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LexFunctionDeclaration(buffer_content, declaration, nullopt, &insert_text,
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&newlines_after_name);
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REQUIRE(insert_text == "void Foo(int a,\n\n int b) {\n}");
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REQUIRE(newlines_after_name == 2);
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LexFunctionDeclaration(buffer_content, declaration, std::string("Type"),
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&insert_text, &newlines_after_name);
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REQUIRE(insert_text == "void Type::Foo(int a,\n\n int b) {\n}");
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REQUIRE(newlines_after_name == 2);
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}
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}
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TEST_SUITE("LexWordAroundPos") {
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TEST_CASE("edges") {
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std::string content = "Foobar";
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'F'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'o'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'b'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'a'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'r'), content) == "Foobar");
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}
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TEST_CASE("simple") {
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std::string content = " Foobar ";
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'F'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'o'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'b'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'a'), content) == "Foobar");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'r'), content) == "Foobar");
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}
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TEST_CASE("underscores, numbers and ::") {
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std::string content = " file:ns::_my_t5ype7 ";
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'f'), content) == "file");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 's'), content) == "ns");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, 'y'), content) == "ns::_my_t5ype7");
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}
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TEST_CASE("dot, dash, colon are skipped") {
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std::string content = "1. 2- 3:";
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REQUIRE(LexIdentifierAroundPos(CharPos(content, '1'), content) == "1");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, '2'), content) == "2");
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REQUIRE(LexIdentifierAroundPos(CharPos(content, '3'), content) == "3");
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}
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}
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