zzy
79ee7a657a
新增libs/ast模块的基础定义文件，包括： - AST节点类型枚举定义，涵盖声明、语句、表达式、类型等各类节点 - AST操作符枚举，定义所有二元、一元、逻辑、算术等操作符 - AST节点结构体定义，包含表达式、语句、声明、类型等具体实现 - AST dump工具接口，支持树形结构输出和颜色显示 - 语义分析回调函数类型定义，为后续语义分析提供基础
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/**
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* @file parser.c
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* @brief 新的解析器实现
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*/
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#include "parser.h"
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#include <log.h>
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static void dummy_sema_callback(void *context, scc_ast_node_type_t node_type,
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void *node) {
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(void)context;
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(void)node_type;
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(void)node;
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return;
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}
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#define ASSIGN_PTR_OR_DEFAULT(assigned_val, value, default) \
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assigned_val = value ? value : default
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void scc_parser_init(scc_parser_t *parser, scc_lexer_stream_t *lexer,
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scc_sema_callbacks_t *callbacks) {
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Assert(parser != null && lexer != null);
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parser->lex_stream = lexer;
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parser->has_error = false;
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parser->translation_unit = null;
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if (callbacks) {
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ASSIGN_PTR_OR_DEFAULT(parser->sema_callbacks.on_decl,
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callbacks->on_decl, dummy_sema_callback);
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ASSIGN_PTR_OR_DEFAULT(parser->sema_callbacks.on_stmt,
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callbacks->on_stmt, dummy_sema_callback);
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ASSIGN_PTR_OR_DEFAULT(parser->sema_callbacks.on_expr,
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callbacks->on_expr, dummy_sema_callback);
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ASSIGN_PTR_OR_DEFAULT(parser->sema_callbacks.on_type,
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callbacks->on_type, dummy_sema_callback);
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parser->sema_callbacks.context = callbacks->context;
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} else {
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parser->sema_callbacks.on_decl = dummy_sema_callback;
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parser->sema_callbacks.on_stmt = dummy_sema_callback;
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parser->sema_callbacks.on_expr = dummy_sema_callback;
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parser->sema_callbacks.on_type = dummy_sema_callback;
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parser->sema_callbacks.context = dummy_sema_callback;
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}
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// // ONLY FOR INIT TYPE
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// parser->current_token.type = SCC_TOK_UNKNOWN;
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}
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void scc_parser_drop(scc_parser_t *parser) {
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// TODO: 释放 AST 内存
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(void)parser;
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}
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scc_ast_translation_unit_t *scc_parse_translation_unit(scc_parser_t *parser) {
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scc_ast_translation_unit_t *unit =
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scc_malloc(sizeof(scc_ast_translation_unit_t));
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if (!unit)
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return null;
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unit->base.type = SCC_AST_TRANSLATION_UNIT;
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scc_vec_init(unit->declarations);
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/**
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* Program := (Declaration | Definition)*
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* same as
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* Program := Declaration* Definition*
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*/
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do {
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scc_ast_decl_t *decl = scc_parse_declaration(parser);
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if (decl != null) {
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scc_vec_push(unit->declarations, decl);
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} else {
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break;
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// MAYBE return or next
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}
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} while (!scc_lexer_tok_match(scc_lexer_stream_current(parser->lex_stream),
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SCC_TOK_EOF) &&
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!parser->has_error);
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if (parser->has_error) {
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// TODO: 清理
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scc_free(unit);
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return null;
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}
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Assert(unit->base.type == SCC_AST_TRANSLATION_UNIT);
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return unit;
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}
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