75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
#include "runtime/runtime_spec_helper.h"
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#include "runtime/helpers/spy_reader.h"
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#include "runtime/helpers/dummy_parser.h"
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#include "tree_sitter/parser/lr_parser.h"
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TSTree *lex_fn_node_to_return;
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TSStateId lex_fn_state_received;
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TSLexer *lex_fn_lexer_received;
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TSTree * fake_lex(TSLexer *lexer, TSStateId state_id) {
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lex_fn_lexer_received = lexer;
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lex_fn_state_received = state_id;
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return lex_fn_node_to_return;
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}
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START_TEST
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describe("LR Parsers", [&]() {
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ts_lr_parser *parser;
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SpyReader *reader;
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before_each([&]() {
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reader = new SpyReader("some structured text", 5);
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parser = ts_lr_parser_make(dummy_parser.symbol_count,
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(const TSParseAction *)dummy_parser.parse_table,
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dummy_parser.lex_states,
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fake_lex,
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dummy_parser.hidden_symbols);
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});
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after_each([&]() {
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delete reader;
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});
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describe("when starting at the beginning of the input (edit is NULL)", [&]() {
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before_each([&]() {
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ts_lr_parser_initialize(parser, reader->input, nullptr);
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});
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it("runs the lexer with the lex state corresponding to the initial state", [&]() {
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lex_fn_node_to_return = ts_tree_make_leaf(dummy_sym2, 5, 1);
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ts_lr_parser_parse(parser, nullptr);
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AssertThat(lex_fn_state_received, Equals(100));
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});
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describe("when the returned symbol indicates a shift action", [&]() {
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before_each([&]() {
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lex_fn_node_to_return = ts_tree_make_leaf(dummy_sym2, 5, 1);
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});
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it("advances to the state specified in the action", [&]() {
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ts_lr_parser_parse(parser, nullptr);
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AssertThat(ts_stack_top_state(&parser->stack), Equals(12));
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});
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it("continues parsing (returns NULL)", [&]() {
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auto result = ts_lr_parser_parse(parser, nullptr);
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AssertThat(result, Equals((TSTree *)nullptr));
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});
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});
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describe("when the returned symbol indicates an error", [&]() {
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before_each([&]() {
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lex_fn_node_to_return = ts_tree_make_leaf(dummy_sym1, 5, 1);
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});
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it("ends the parse, returning an error tree", [&]() {
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auto result = ts_lr_parser_parse(parser, nullptr);
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AssertThat(ts_tree_symbol(result), Equals(ts_builtin_sym_error));
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});
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});
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});
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});
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END_TEST
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