实现 12.5 递归下降语法：AST + 拒绝清单。
- Parser.h/cpp：POU 外壳（PROGRAM/FUNCTION/FUNCTION_BLOCK）、变量段、语句（赋值/IF/WHILE/FB 调用）、表达式优先级爬升（NOT/AND/OR 短路/比较/算术/函数调用/负号） - Unit 结构：顶层 VAR_GLOBAL 段（GVL 文件形态）+ POU 列表 - 拒绝：VAR_IN_OUT/REF/CLASS/ANY 等保留名、链式比较、FB 字段赋值、顶层非 GVL 段 - THEN/DO 补入关键字表（12.5 修订，同步 12.1 与词法文档） - parser_test：98 断言（line1 三文件 AST、FUNCTION 调用、IF/WHILE/TON、9 类负例），ctest 6/6
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@@ -34,3 +34,14 @@ target_compile_definitions(lexer_test PRIVATE
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add_test(NAME lexer_tokens
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COMMAND lexer_test)
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# 语法测试：line1 AST 结构 + 负例（REPO_ROOT 注入源目录绝对路径）
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add_executable(parser_test
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./src/parser_test.cpp)
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target_link_libraries(parser_test PRIVATE compiler)
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target_compile_definitions(parser_test PRIVATE
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REPO_ROOT="${CMAKE_SOURCE_DIR}")
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add_test(NAME parser_syntax
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COMMAND parser_test)
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@@ -0,0 +1,301 @@
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/**
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* @file parser_test.cpp
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* @brief 语法测试：line1 AST 结构 + 负例
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* @author
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* @date 2026-08-21
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*/
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#include <cstdio>
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#include <string>
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#include "compiler/Parser.h"
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#ifndef REPO_ROOT
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#define REPO_ROOT "."
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#endif
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static int g_checks = 0;
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#define CHECK(cond) \
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do { \
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if (!(cond)) { \
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std::printf("FAIL %s:%d: %s\n", __FILE__, __LINE__, #cond); \
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return false; \
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} \
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++g_checks; \
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} while (0)
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// ---- 1. GVL 文件（顶层 VAR_GLOBAL，无 POU）----
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static bool test_gvl_file() {
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using namespace compiler;
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Unit u;
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std::string err;
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CHECK(parse_pous_file(std::string(REPO_ROOT) + "/examples/line1/globals.st", &u, &err));
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CHECK(u.globals.size() == 1);
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CHECK(u.pous.empty());
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const VarBlock& g = u.globals[0];
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CHECK(g.section == VarSection::Global);
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CHECK(g.vars.size() == 4);
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CHECK(g.vars[0].name == "emergencystop");
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CHECK(g.vars[0].type.kind == TypeKind::Bool);
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CHECK(g.vars[0].has_init && g.vars[0].init_value == 0); // := FALSE
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CHECK(!g.vars[1].has_init); // I0_0
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return true;
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}
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// ---- 2. motor.st：FUNCTION_BLOCK ----
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static bool test_fb() {
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using namespace compiler;
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Unit u;
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std::string err;
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CHECK(parse_pous_file(std::string(REPO_ROOT) + "/examples/line1/motor.st", &u, &err));
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CHECK(u.globals.empty());
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CHECK(u.pous.size() == 1);
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const POU& p = u.pous[0];
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CHECK(p.kind == PouKind::FunctionBlock);
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CHECK(p.name == "motorstarter");
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CHECK(p.blocks.size() == 3);
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CHECK(p.blocks[0].section == VarSection::External);
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CHECK(p.blocks[0].vars[0].name == "emergencystop");
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CHECK(p.blocks[1].section == VarSection::Input);
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CHECK(p.blocks[1].vars.size() == 2);
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CHECK(p.blocks[2].section == VarSection::Output);
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CHECK(p.blocks[2].vars[0].name == "q");
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CHECK(p.body.size() == 1);
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const Stmt& s = p.body[0];
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CHECK(s.kind == StmtKind::Assign);
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CHECK(s.target == "q");
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CHECK(!s.target_is_field);
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// Q := start AND NOT stop AND NOT EmergencyStop
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// 左结合：(start AND NOT stop) AND NOT EmergencyStop
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CHECK(s.value->kind == ExprKind::And);
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CHECK(s.value->rhs->kind == ExprKind::Not);
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CHECK(s.value->rhs->operand->kind == ExprKind::VarRef &&
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s.value->rhs->operand->name == "emergencystop");
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CHECK(s.value->lhs->kind == ExprKind::And);
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CHECK(s.value->lhs->lhs->kind == ExprKind::VarRef &&
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s.value->lhs->lhs->name == "start");
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CHECK(s.value->lhs->rhs->kind == ExprKind::Not);
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CHECK(s.value->lhs->rhs->operand->kind == ExprKind::VarRef &&
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s.value->lhs->rhs->operand->name == "stop");
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return true;
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}
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// ---- 3. main.st：PROGRAM + FB 调用 + 字段读 ----
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static bool test_program() {
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using namespace compiler;
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Unit u;
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std::string err;
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CHECK(parse_pous_file(std::string(REPO_ROOT) + "/examples/line1/main.st", &u, &err));
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CHECK(u.pous.size() == 1);
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const POU& p = u.pous[0];
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CHECK(p.kind == PouKind::Program);
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CHECK(p.name == "main");
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CHECK(p.blocks.size() == 1);
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CHECK(p.blocks[0].section == VarSection::Local);
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CHECK(p.blocks[0].vars[0].name == "starter");
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CHECK(p.blocks[0].vars[0].type.kind == TypeKind::FbUser);
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CHECK(p.blocks[0].vars[0].type.name == "motorstarter");
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CHECK(p.body.size() == 2);
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const Stmt& call = p.body[0];
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CHECK(call.kind == StmtKind::FbCall);
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CHECK(call.instance == "starter");
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CHECK(call.args.size() == 2);
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CHECK(call.args[0].name == "start");
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CHECK(call.args[0].value->kind == ExprKind::VarRef &&
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call.args[0].value->name == "i0_0");
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CHECK(call.args[1].name == "stop");
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CHECK(call.args[1].value->kind == ExprKind::VarRef &&
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call.args[1].value->name == "i0_1");
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const Stmt& assign = p.body[1];
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CHECK(assign.kind == StmtKind::Assign);
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CHECK(assign.target == "q0_0");
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CHECK(assign.value->kind == ExprKind::Field);
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CHECK(assign.value->name == "starter");
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CHECK(assign.value->field == "q");
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return true;
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}
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// ---- 4. FUNCTION：返回值类型 + 函数调用表达式 ----
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static bool test_function() {
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using namespace compiler;
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Unit u;
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std::string err;
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const char* src =
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"FUNCTION Add : INT\n"
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"VAR_INPUT\n"
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" a, b : INT;\n"
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"END_VAR\n"
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" Add := a + b;\n"
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"END_FUNCTION\n"
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"PROGRAM MAIN\n"
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"VAR\n"
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" x : INT;\n"
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"END_VAR\n"
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" x := Add(3, 4) * 2;\n"
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"END_PROGRAM\n";
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CHECK(parse_pous("t.st", src, &u, &err));
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CHECK(u.pous.size() == 2);
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const POU& f = u.pous[0];
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CHECK(f.kind == PouKind::Function);
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CHECK(f.name == "add");
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CHECK(f.result_type.kind == TypeKind::Int);
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CHECK(f.body[0].kind == StmtKind::Assign);
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CHECK(f.body[0].value->kind == ExprKind::Add);
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const POU& m = u.pous[1];
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const Stmt& s = m.body[0];
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CHECK(s.value->kind == ExprKind::Mul);
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CHECK(s.value->lhs->kind == ExprKind::Call);
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CHECK(s.value->lhs->name == "add");
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CHECK(s.value->lhs->args.size() == 2);
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CHECK(s.value->lhs->args[0]->kind == ExprKind::LitInt &&
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s.value->lhs->args[0]->int_value == 3);
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CHECK(s.value->lhs->args[1]->kind == ExprKind::LitInt &&
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s.value->lhs->args[1]->int_value == 4);
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return true;
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}
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// ---- 5. IF / WHILE / 内建 FB 类型 ----
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static bool test_control() {
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using namespace compiler;
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Unit u;
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std::string err;
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const char* src =
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"PROGRAM MAIN\n"
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"VAR\n"
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" sel : INT;\n"
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" out : INT;\n"
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" t : TON;\n"
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" n : INT;\n"
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"END_VAR\n"
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" IF sel = 0 THEN\n"
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" out := 10;\n"
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" ELSIF sel = 1 THEN\n"
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" out := 20;\n"
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" ELSE\n"
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" out := 30;\n"
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" END_IF\n"
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" n := 0;\n"
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" WHILE n < 10 DO\n"
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" n := n + 1;\n"
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" END_WHILE\n"
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" t(in := TRUE, pt := T#30ms);\n"
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"END_PROGRAM\n";
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CHECK(parse_pous("t.st", src, &u, &err));
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const POU& p = u.pous[0];
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CHECK(p.blocks[0].vars[2].name == "t");
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CHECK(p.blocks[0].vars[2].type.kind == TypeKind::FbBuiltin);
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CHECK(p.blocks[0].vars[2].type.name == "ton");
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CHECK(p.body.size() == 4);
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const Stmt& ifs = p.body[0];
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CHECK(ifs.kind == StmtKind::If);
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CHECK(ifs.cond->kind == ExprKind::Cmp);
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CHECK(ifs.cond->op == BinOp::Eq);
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CHECK(ifs.cond->lhs->kind == ExprKind::VarRef && ifs.cond->lhs->name == "sel");
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CHECK(ifs.body.size() == 1);
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CHECK(ifs.elsifs.size() == 1);
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CHECK(ifs.elsifs[0].cond->lhs->name == "sel");
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CHECK(ifs.else_body.size() == 1);
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const Stmt& w = p.body[2];
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CHECK(w.kind == StmtKind::While);
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CHECK(w.cond->kind == ExprKind::Cmp);
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CHECK(w.cond->op == BinOp::Lt);
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CHECK(w.body.size() == 1);
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const Stmt& ton = p.body[3];
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CHECK(ton.kind == StmtKind::FbCall);
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CHECK(ton.instance == "t");
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CHECK(ton.args[1].name == "pt");
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CHECK(ton.args[1].value->kind == ExprKind::LitTime);
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CHECK(ton.args[1].value->int_value == 30);
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return true;
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}
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// ---- 6. 负例 ----
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static bool expect_syntax_err(const std::string& src, const char* keyword) {
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compiler::Unit u;
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std::string err;
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if (compiler::parse_pous("t.st", src, &u, &err)) {
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std::printf("FAIL: parsed ok: %s\n", src.c_str());
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return false;
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}
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if (err.find("syntax error") != 0) {
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std::printf("FAIL: want 'syntax error', got '%s'\n", err.c_str());
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return false;
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}
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if (std::string(keyword).empty()) {
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++g_checks;
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return true;
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}
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if (err.find(keyword) == std::string::npos) {
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std::printf("FAIL: want keyword '%s', got '%s'\n", keyword, err.c_str());
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return false;
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}
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++g_checks;
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return true;
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}
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static bool test_negative() {
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// VAR_IN_OUT / REF / CLASS / ANY 明确拒绝
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if (!expect_syntax_err(
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"PROGRAM MAIN\nVAR_IN_OUT\nx : INT;\nEND_VAR\nEND_PROGRAM", "not supported")) {
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return false;
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}
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if (!expect_syntax_err("FUNCTION F : INT\n F := 1;\n REF := 2;\nEND_FUNCTION",
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"not supported")) {
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return false;
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}
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// 缺 END_*
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if (!expect_syntax_err("PROGRAM MAIN\nIF x THEN\ny := 1;\nEND_PROGRAM", "")) {
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return false;
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}
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if (!expect_syntax_err("FUNCTION_BLOCK F\nEND_PROGRAM", "")) {
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return false;
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}
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// 链式比较
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if (!expect_syntax_err("PROGRAM MAIN\na := b < c < d;\nEND_PROGRAM",
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"chained comparison")) {
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return false;
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}
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// 字段赋值
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if (!expect_syntax_err("PROGRAM MAIN\nstarter.Q := TRUE;\nEND_PROGRAM",
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"FB field")) {
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return false;
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}
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// 顶层非 VAR_GLOBAL 段
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if (!expect_syntax_err("VAR\nx : INT;\nEND_VAR\n", "top level")) {
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return false;
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}
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// 初值非字面量
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if (!expect_syntax_err("PROGRAM MAIN\nVAR\nx : INT := y;\nEND_VAR\nEND_PROGRAM", "")) {
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return false;
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}
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// 坏类型名
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if (!expect_syntax_err("PROGRAM MAIN\nVAR\nx : ;\nEND_VAR\nEND_PROGRAM",
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"expected type name")) {
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return false;
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}
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return true;
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}
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int main() {
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if (!test_gvl_file()) return 1;
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if (!test_fb()) return 1;
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if (!test_program()) return 1;
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if (!test_function()) return 1;
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if (!test_control()) return 1;
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if (!test_negative()) return 1;
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std::printf("parser_test: %d checks passed\n", g_checks);
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return 0;
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}
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