From 255a49ba5a41b3854dbdfebdec75fb6229450507 Mon Sep 17 00:00:00 2001 From: Galin Simeonov Date: Mon, 31 May 2021 22:02:10 +0300 Subject: added cmake file --- src/frontend/parser.c | 669 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 669 insertions(+) create mode 100644 src/frontend/parser.c (limited to 'src/frontend/parser.c') diff --git a/src/frontend/parser.c b/src/frontend/parser.c new file mode 100644 index 0000000..3e4e449 --- /dev/null +++ b/src/frontend/parser.c @@ -0,0 +1,669 @@ +#ifndef PARSER_C +#define PARSER_C PARSER_C +#include + +/* + * parse-unit: machine + * + */ +struct AST* parse_unit(struct Translation_Data *translation_data) +{ + return (struct AST*)parse_machine(translation_data); +} +/* + * machine: 'machine' id '[' machine-inner ']' ';' + * + */ +struct AST_Machine* parse_machine(struct Translation_Data *translation_data) +{ + struct AST_Machine *ret; + struct token *hold_id; + if(get_and_check(translation_data,KW_MACHINE)) + { + if(get_kw(translation_data)==KW_ID) + { + hold_id=Queue_Pop(translation_data->tokens); + if(get_and_check(translation_data,KW_OPEN_SQUARE)) + { + ret=(struct AST_Machine*)parse_machine_inner(hold_id,translation_data); + if(has_new_errors(translation_data)) + { + delete_ast_machine(ret); + touch_errors(translation_data); + + return NULL; + } + if(get_and_check(translation_data,KW_CLOSE_SQUARE)) + { + if(get_and_check(translation_data,KW_SEMI_COLUMN)) + return ret; + else + { + push_parsing_error("';' expected after machine definition",translation_data); + delete_ast_machine(ret); + return NULL; + } + }else + { + push_parsing_error("closing ']' expected",translation_data); + delete_ast_machine(ret); + return NULL; + } + }else + { + push_parsing_error("opening '[' expected",translation_data); + return NULL; + } + }else + { + push_parsing_error("expected a name for the machine",translation_data); + return NULL; + } + }else + { + push_parsing_error("'machine' expected",translation_data); + return NULL; + } +} +/* + * machine-inner : 'states' '[' states-inner ']' ';' + * 'events' '[' events-inner ']' ';' + * 'transitions' '[' transitions-inner ']' ';' + * 'starting' start-on-inner ';' + */ +struct AST_Machine* parse_machine_inner(struct token *machine_id,struct Translation_Data *translation_data) +{ + struct AST_States *states=NULL; + struct AST_Events *events=NULL; + struct AST_Transitions *transitions=NULL; + struct AST_State *starting_state=NULL; + unsigned char i; + for(i=0;i<4;++i) + switch(get_kw(translation_data)) + { + case KW_STATES: + if(states) + { + push_parsing_error("defining two sets of states",translation_data); + goto error_cleanup; + }else + { + chomp(translation_data); + if(get_and_check(translation_data,KW_OPEN_SQUARE)) + { + states=parse_states_inner(translation_data); + if(!get_and_check(translation_data,KW_CLOSE_SQUARE) + || !get_and_check(translation_data,KW_SEMI_COLUMN)) + { + push_parsing_error("expected ']' and ';' at " + "end of states definition",translation_data); + goto error_cleanup; + } + + }else + { + push_parsing_error("expected '[' ",translation_data); + goto error_cleanup; + } + } + break; + case KW_TRANSITIONS: + if(states==NULL && events==NULL) + { + push_parsing_error("defining transitions before states and events",translation_data); + goto error_cleanup; + }else if(transitions) + { + push_parsing_error("defining two sets of transitions",translation_data); + goto error_cleanup; + }else + { + chomp(translation_data); + if(get_and_check(translation_data,KW_OPEN_SQUARE)) + { + transitions=parse_transitions_inner(translation_data,states,events); + if(!get_and_check(translation_data,KW_CLOSE_SQUARE) + || !get_and_check(translation_data,KW_SEMI_COLUMN)) + { + push_parsing_error("expected ']' and ';' at " + "end of transitions definition",translation_data); + goto error_cleanup; + } + }else + { + push_parsing_error("expected '[' ",translation_data); + goto error_cleanup; + } + } + break; + case KW_EVENTS: + if(events) + { + push_parsing_error("defining two sets of transitions",translation_data); + goto error_cleanup; + }else + { + chomp(translation_data); + if(get_and_check(translation_data,KW_OPEN_SQUARE)) + { + events=parse_events_inner(translation_data); + if(!get_and_check(translation_data,KW_CLOSE_SQUARE) + || !get_and_check(translation_data,KW_SEMI_COLUMN)) + { + push_parsing_error("expected ']' and ';' at " + "end of events definition",translation_data); + goto error_cleanup; + } + }else + { + push_parsing_error("expected '[' ",translation_data); + goto error_cleanup; + } + } + break; + case KW_STARTING: + chomp(translation_data); + if(!starting_state) + { + if(states) + { + starting_state=parse_start_on(translation_data,states); + if(!get_and_check(translation_data,KW_SEMI_COLUMN)) + { + push_parsing_error("expected ';' at end " + "of starting state declaration",translation_data); + goto error_cleanup; + } + }else + { + push_parsing_error("states need to be defined" + " before defining a starting one",translation_data); + goto error_cleanup; + } + }else + { + push_parsing_error("starting state is defined",translation_data); + goto error_cleanup; + } + break; + default: + push_parsing_error("expected states transitions or events",translation_data); + goto error_cleanup; + + } + + return get_ast_machine(machine_id,states,events,transitions,starting_state); + +error_cleanup: + push_parsing_error("in machine",translation_data); + if(states)delete_ast_states(states); + if(events)delete_ast_events(events); + if(transitions)delete_ast_transitions(transitions); + return NULL; +} +/* + * states-inner: state (, state)* + * + */ +struct AST_States* parse_states_inner(struct Translation_Data *translation_data) +{ + struct Queue *ids; + struct AST_State *hold_state; + + ids=parse_list((struct AST*(*)(struct Translation_Data*))parse_state,translation_data,KW_COMMA); + if(ids->size==0) + { + push_parsing_error("there needs to be atleast one state",translation_data); + free(ids); + return NULL; + }else + { + + return get_ast_states(ids); + } +} +/* + * state : id + * + */ +struct AST_State* parse_state(struct Translation_Data *translation_data) +{ + if(get_kw(translation_data)==KW_ID) + return get_ast_state(Queue_Pop(translation_data->tokens)); + else + return NULL; +} +/* + * events-inner: id (, id)* + * + */ +struct AST_Events* parse_events_inner(struct Translation_Data *translation_data) +{ + struct Queue *ids; + ids=parse_list((struct AST*(*)(struct Translation_Data*))parse_event,translation_data,KW_COMMA); + if(ids->size==0) + { + push_parsing_error("there needs to be atleast one event",translation_data); + return NULL; + }else + { + return get_ast_events(ids); + } +} +struct AST_Event* parse_event(struct Translation_Data *translation_data) +{ + if(get_kw(translation_data)==KW_ID) + return get_ast_event(Queue_Pop(translation_data->tokens)); + else + return NULL; +} +/* + * transitions-inner: ( transition ;)* + */ +struct AST_Transitions* parse_transitions_inner(struct Translation_Data *translation_data,struct AST_States *states,struct AST_Events *events) +{ + struct Queue *transitions; + struct AST_Transition *hold_transition; + + transitions=malloc(sizeof(struct Queue)); + Queue_Init(transitions); + + while((hold_transition=parse_transition(translation_data,states,events))!=NULL) + { + Queue_Push(transitions,hold_transition); + if(!get_and_check(translation_data,KW_SEMI_COLUMN)) + break; + } + + if(transitions->size==0) + { + push_parsing_error("there are no transitions",translation_data); + return NULL; + }else + { + return get_ast_transitions(transitions); + } +} +/* + * transition: 'from' state_id 'to' state_id 'on' 'event' event_id [ 'execute' pipeline ] + * + */ +struct AST_Transition* parse_transition(struct Translation_Data *translation_data,struct AST_States *states,struct AST_Events *events) +{ + struct AST_Transition *ret; + struct AST_State *hold_from; + struct AST_State *hold_to; + struct AST_Event *hold_event; + struct AST_Pipeline *hold_pipeline=NULL; + struct token *hold_token; + + if(get_and_check(translation_data,KW_FROM)) + { + if(get_kw(translation_data)==KW_ID) + { + hold_token=Queue_Pop(translation_data->tokens); + hold_from=Map_Check(states->states_map,hold_token->data,hold_token->size); + delete_token(hold_token); + if(hold_from!=NULL) + { + if(get_and_check(translation_data,KW_TO)) + { + if(get_kw(translation_data)==KW_ID) + { + hold_token=Queue_Pop(translation_data->tokens); + hold_to=Map_Check(states->states_map,hold_token->data,hold_token->size); + delete_token(hold_token); + if(hold_to!=NULL) + { + if(get_and_check(translation_data,KW_ON) && get_and_check(translation_data,KW_EVENT) ) + { + if(get_kw(translation_data)==KW_ID) + { + hold_token=Queue_Pop(translation_data->tokens); + hold_event=Map_Check(events->events_map,hold_token->data,hold_token->size); + delete_token(hold_token); + if(hold_event!=NULL) + { + if(get_and_check(translation_data,KW_EXECUTE)) + if((hold_pipeline=parse_pipeline(translation_data))==NULL) + { push_parsing_error("after execute",translation_data); return NULL; } + /*GOAL*/ + return get_ast_transition(hold_from,hold_to,hold_event,hold_pipeline); + }else { push_parsing_error("event not defined",translation_data); return NULL; } + }else { push_parsing_error("no event name given in transition",translation_data); return NULL; } + }else { push_parsing_error("expected 'on event'",translation_data); return NULL; } + }else { push_parsing_error("using undefined to state in transition",translation_data); } + }else { push_parsing_error("expected id in transition expression",translation_data); return NULL; } + }else { push_parsing_error("expected 'to'",translation_data); return NULL; } + }else { push_parsing_error("using undefined from state in transition",translation_data); return NULL; } + }else { push_parsing_error("expected id in transition expression",translation_data); return NULL; } + }else { return NULL; } +} +/* + * pipeline: [ command ( | command )* ] + * + */ +struct AST_Pipeline* parse_pipeline(struct Translation_Data *translation_data) +{ + struct Queue *pipeline; + pipeline=parse_list((struct AST*(*)(struct Translation_Data*))parse_command,translation_data,KW_PIPE); + if(pipeline->size==0) + { + free(pipeline); + push_parsing_error("pipeline is empty",translation_data); + return NULL; + }else + { + return get_ast_pipeline(pipeline); + } +} +/* + * command: id [ string ] + * + */ +struct AST_Command* parse_command(struct Translation_Data *translation_data) +{ + struct token *id; + struct token *string=NULL; + if(get_kw(translation_data)==KW_ID) + { + id=Queue_Pop(translation_data->tokens); + if(get_kw(translation_data)==KW_STRING) + string=Queue_Pop(translation_data->tokens); + return get_ast_command(id,string); + }else + { + push_parsing_error("expected command id",translation_data); + return NULL; + } +} +/* + * starting-on-inner: 'on' id ; + */ +struct AST_State* parse_start_on(struct Translation_Data *translation_data,struct AST_States *states) +{ + struct token *hold_id; + struct AST_State *hold_state; + + if(get_and_check(translation_data,KW_ON)) + { + if(get_kw(translation_data)==KW_ID) + { + hold_id=Queue_Pop(translation_data->tokens); + hold_state=Map_Check(states->states_map,hold_id->data,hold_id->size); + free(hold_id); + if(hold_state) + { + + return hold_state; + + }else { push_parsing_error("starting state is not defined",translation_data); return NULL; } + }else { push_parsing_error("expected an identifier for starting state",translation_data); return NULL; } + }else { push_parsing_error("expected 'on'",translation_data); return NULL; } +} +struct AST_State* get_ast_state(struct token *id) +{ + struct AST_State *ret; + + ret=malloc(sizeof(struct AST_State)); + ret->type=AST_TYPE_STATE; + ret->id=id; + + return ret; +} +struct AST_Event* get_ast_event(struct token *id) +{ + struct AST_Event *ret; + + ret=malloc(sizeof(struct AST_Event)); + ret->type=AST_TYPE_EVENT; + ret->id=id; + + return ret; +} +struct AST_States* get_ast_states(struct Queue *states) +{ + struct AST_States *ret; + struct AST_State *hold_state; + + /*perhaps no states error should be handled here*/ + assert(states && states->size>0); + + ret=malloc(sizeof(struct AST_States)+sizeof(struct AST_Event *[states->size])); + ret->type=AST_TYPE_STATES; + ret->number_of_states=states->size; + ret->states_map=malloc(sizeof(struct Map)); + + Map_Init(ret->states_map); + + while(states->size>0) + { + hold_state=Queue_Pop(states); + Map_Push(ret->states_map,hold_state->id->data,hold_state->id->size,hold_state); + ret->states[states->size]=hold_state; + } + + assert(states->size==0); + free(states); + + return ret; +} +struct AST_Events* get_ast_events(struct Queue *events) +{ + struct AST_Events *ret; + struct AST_Event *hold_event; + + /*perhaps no events error should be handled here*/ + assert(events && events->size>0); + + ret=malloc(sizeof(struct AST_Events)+sizeof(struct AST_Event *[events->size])); + ret->type=AST_TYPE_EVENTS; + ret->number_of_events=events->size; + ret->events_map=malloc(sizeof(struct Map)); + + Map_Init(ret->events_map); + + while(events->size>0) + { + hold_event=Queue_Pop(events); + Map_Push(ret->events_map,hold_event->id->data,hold_event->id->size,hold_event); + ret->events[events->size]=hold_event; + } + + assert(events->size==0); + free(events); + + return ret; +} +struct AST_Transition* get_ast_transition(struct AST_State *from,struct AST_State *to,struct AST_Event *event,struct AST_Pipeline *pipeline) +{ + struct AST_Transition *ret; + ret=malloc(sizeof(struct AST_Transition)); + ret->type=AST_TYPE_TRANSITION; + ret->from=from; + ret->to=to; + ret->event=event; + ret->pipeline=pipeline; + + return ret; +} +struct AST_Command* get_ast_command(struct token *function_name,struct token *argument) +{ + struct AST_Command *ret; + ret=malloc(sizeof(struct AST_Command)); + ret->type=AST_TYPE_COMMAND; + ret->function_name=function_name; + ret->argument=argument; + + return ret; +} +struct AST_Pipeline* get_ast_pipeline(struct Queue *pipeline) +{ + struct AST_Pipeline *ret; + + ret=malloc(sizeof(struct AST_Pipeline)+sizeof(struct AST_Command *[pipeline->size])); + ret->type=AST_TYPE_PIPELINE; + ret->size=pipeline->size; + pointer_array_fill((void**)ret->pipeline,pipeline); + + assert(pipeline->size==0); + free(pipeline); + + return ret; +} +struct AST_Machine* get_ast_machine(struct token *id,struct AST_States *states,struct AST_Events *events,struct AST_Transitions *transitions,struct AST_State *starting_state) +{ + struct AST_Machine *ret; + + ret=malloc(sizeof(struct AST_Machine)); + ret->type=AST_TYPE_MACHINE; + ret->id=id; + ret->states=states; + ret->events=events; + ret->transitions=transitions; + + return ret; +} +struct AST_Transitions* get_ast_transitions(struct Queue *transitions) +{ + struct AST_Transitions *ret; + ret=malloc(sizeof(struct AST_Transitions)+sizeof(struct AST_Transition *[transitions->size])); + ret->type=AST_TYPE_TRANSITIONS; + ret->size=transitions->size; + + pointer_array_fill((void**)ret->transitions,transitions); + + assert(transitions->size==0); + free(transitions); + + return ret; +} +void delete_ast(struct AST* ast) +{ + switch(ast->type) + { + case AST_TYPE_MACHINE: + delete_ast_machine((struct AST_Machine*)ast); + break; + case AST_TYPE_STATE: + delete_ast_state((struct AST_State*)ast); + break; + case AST_TYPE_STATES: + delete_ast_states((struct AST_States*)ast); + break; + case AST_TYPE_EVENT: + delete_ast_event((struct AST_Event*)ast); + break; + case AST_TYPE_EVENTS: + delete_ast_events((struct AST_Events*)ast); + break; + case AST_TYPE_TRANSITION: + delete_ast_transition((struct AST_Transition*)ast); + break; + case AST_TYPE_TRANSITIONS: + delete_ast_transitions((struct AST_Transitions*)ast); + break; + case AST_TYPE_COMMAND: + delete_ast_command((struct AST_Command*)ast); + break; + case AST_TYPE_PIPELINE: + delete_ast_pipeline((struct AST_Pipeline*)ast); + break; + } +} +void delete_ast_event(struct AST_Event* ast) +{ + if(ast==NULL)return; + delete_token(ast->id); + free(ast); +} +void delete_ast_states(struct AST_States* ast) +{ + size_t i; + if(ast==NULL)return; + for(i=0;inumber_of_states;++i) + delete_ast_state(ast->states[i]); + free(ast); +} +void delete_ast_events(struct AST_Events* ast) +{ + size_t i; + if(ast==NULL)return; + for(i=0;inumber_of_events;++i) + delete_ast_event(ast->events[i]); + free(ast); +} +void delete_ast_transition(struct AST_Transition* ast) +{ + if(ast==NULL)return; + if(ast->pipeline!=NULL) + delete_ast_pipeline(ast->pipeline); + free(ast); +} +void delete_ast_command(struct AST_Command* ast) +{ + if(ast==NULL)return; + delete_token(ast->function_name); + if(ast->argument!=NULL) + delete_token(ast->argument); + free(ast); +} +void delete_ast_pipeline(struct AST_Pipeline* ast) +{ + size_t i; + if(ast==NULL)return; + for(i=0;isize;++i) + delete_ast_command(ast->pipeline[i]); + free(ast); +} +void delete_ast_machine(struct AST_Machine* ast) +{ + if(ast==NULL)return; + if(ast->id!=NULL) + delete_token(ast->id); + if(ast->states!=NULL) + delete_ast_states(ast->states); + if(ast->events!=NULL) + delete_ast_events(ast->events); + if(ast->transitions!=NULL) + delete_ast_transitions(ast->transitions); +} +void delete_ast_transitions(struct AST_Transitions* ast) +{ + size_t i; + if(ast==NULL)return; + for(i=0;isize;++i) + delete_ast_transition(ast->transitions[i]); + free(ast); +} +void delete_ast_state(struct AST_State* ast) +{ + if(ast==NULL)return; + if(ast->id!=NULL) + delete_token(ast->id); + free(ast); +} +void pointer_array_fill(void **array,struct Queue *q) +{ + size_t i; + for(i=0;q->size>0;++i) + array[i]=Queue_Pop(q); +} + +struct Queue* parse_list(struct AST *(*parser)(struct Translation_Data*),struct Translation_Data *translation_data,enum Keyword delim) +{ + struct Queue *q; + struct AST* hold_ast; + + q=malloc(sizeof(struct Queue)); + Queue_Init(q); + while(hold_ast=parser(translation_data)) + { + Queue_Push(q,hold_ast); + if(!get_and_check(translation_data,delim)) + break; + } + return q; +} + +#endif -- cgit v1.2.3