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-rw-r--r--parser.c669
1 files changed, 669 insertions, 0 deletions
diff --git a/parser.c b/parser.c
new file mode 100644
index 0000000..3e4e449
--- /dev/null
+++ b/parser.c
@@ -0,0 +1,669 @@
+#ifndef PARSER_C
+#define PARSER_C PARSER_C
+#include <parser.h>
+
+/*
+ * 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;i<ast->number_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;i<ast->number_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;i<ast->size;++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;i<ast->size;++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