138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
#include "runtime/helpers/spy_input.h"
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#include <string.h>
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#include <algorithm>
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#include "utf8proc.h"
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#include <assert.h>
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using std::string;
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static const size_t UTF8_MAX_CHAR_SIZE = 4;
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static size_t string_char_count(const string &text) {
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const char *bytes = text.data();
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size_t len = text.size();
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size_t character = 0, byte = 0;
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int32_t dest_char;
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while (byte < len) {
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byte += utf8proc_iterate(
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(uint8_t *)bytes + byte,
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len - byte,
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&dest_char);
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character++;
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}
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return character;
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}
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static long byte_for_character(const char *str, size_t len, size_t goal_character) {
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size_t character = 0, byte = 0;
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int32_t dest_char;
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while (character < goal_character) {
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if (byte >= len)
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return -1;
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byte += utf8proc_iterate(
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(uint8_t *)str + byte,
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len - byte,
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&dest_char);
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character++;
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}
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return byte;
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}
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SpyInput::SpyInput(string content, size_t chars_per_chunk) :
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chars_per_chunk(chars_per_chunk),
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buffer_size(UTF8_MAX_CHAR_SIZE * chars_per_chunk),
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buffer(new char[buffer_size]),
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byte_offset(0),
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content(content),
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strings_read({""}) {}
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SpyInput::~SpyInput() {
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delete buffer;
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}
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const char * SpyInput::read(void *payload, size_t *bytes_read) {
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auto spy = static_cast<SpyInput *>(payload);
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if (spy->byte_offset > spy->content.size()) {
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*bytes_read = 0;
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return "";
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}
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const char *start = spy->content.data() + spy->byte_offset;
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long byte_count = byte_for_character(start, spy->content.size() - spy->byte_offset, spy->chars_per_chunk);
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if (byte_count < 0)
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byte_count = spy->content.size() - spy->byte_offset;
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*bytes_read = byte_count;
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spy->byte_offset += byte_count;
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spy->strings_read.back() += string(start, byte_count);
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/*
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* This class stores its entire `content` in a contiguous buffer, but we want
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* to ensure that the code under test cannot accidentally read more than
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* `*bytes_read` bytes past the returned pointer. To make sure that this type
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* of error does not fly, we copy the chunk into a zeroed-out buffer and
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* return a reference to that buffer, rather than a pointer into the main
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* content.
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*/
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memset(spy->buffer, 0, spy->buffer_size);
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memcpy(spy->buffer, start, byte_count);
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return spy->buffer;
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}
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int SpyInput::seek(void *payload, size_t character, size_t byte) {
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auto spy = static_cast<SpyInput *>(payload);
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if (spy->strings_read.size() == 0 || spy->strings_read.back().size() > 0)
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spy->strings_read.push_back("");
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spy->byte_offset = byte;
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return 0;
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}
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TSInput SpyInput::input() {
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TSInput result;
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result.payload = this;
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result.seek_fn = seek;
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result.read_fn = read;
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return result;
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}
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TSInputEdit SpyInput::replace(size_t start_char, size_t chars_removed, string text) {
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string text_removed = swap_substr(start_char, chars_removed, text);
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size_t chars_inserted = string_char_count(text);
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undo_stack.push_back(SpyInputEdit{start_char, chars_inserted, text_removed});
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return {start_char, chars_inserted, chars_removed};
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}
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TSInputEdit SpyInput::undo() {
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SpyInputEdit entry = undo_stack.back();
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undo_stack.pop_back();
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swap_substr(entry.position, entry.chars_removed, entry.text_inserted);
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size_t chars_inserted = string_char_count(entry.text_inserted);
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return TSInputEdit{entry.position, chars_inserted, entry.chars_removed};
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}
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string SpyInput::swap_substr(size_t start_char, size_t chars_removed, string text) {
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const char *bytes = content.data();
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size_t size = content.size();
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long start_byte = byte_for_character(bytes, size, start_char);
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assert(start_byte >= 0);
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long bytes_removed = byte_for_character(bytes + start_byte, size - start_byte, chars_removed);
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if (bytes_removed < 0)
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bytes_removed = size - start_byte;
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string text_removed = content.substr(start_byte, bytes_removed);
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content.erase(start_byte, bytes_removed);
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content.insert(start_byte, text);
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return text_removed;
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}
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void SpyInput::clear() {
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strings_read.clear();
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}
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