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#ifndef ROSCHA_AST_H
#define ROSCHA_AST_H
#include "hmap.h"
#include "token.h"
#include "vector.h"
#include "sds/sds.h"
/* AST node structures */
enum block_type {
BLOCK_CONTENT,
BLOCK_VARIABLE,
BLOCK_TAG,
};
enum tag_type {
TAG_IF,
TAG_FOR,
TAG_BLOCK,
TAG_EXTENDS,
/* keyword-only tags */
TAG_BREAK,
TAG_CLOSE,
};
enum expression_type {
EXPRESSION_IDENT,
EXPRESSION_INT,
EXPRESSION_BOOL,
EXPRESSION_STRING,
EXPRESSION_PREFIX,
EXPRESSION_INFIX,
EXPRESSION_MAPKEY,
EXPRESSION_INDEX,
};
struct ident {
struct token token;
};
struct integer {
struct token token;
int64_t value;
};
struct boolean {
struct token token;
bool value;
};
struct string {
struct token token;
struct slice value;
};
struct prefix {
struct token token;
struct slice operator;
struct expression *right;
};
struct infix {
struct token token;
struct slice operator;
struct expression *left;
struct expression *right;
};
/* Either a map key (map.k) or an array/vector index (arr[i]) */
struct indexkey {
struct token token;
struct expression *left;
struct expression *key;
};
struct expression {
enum expression_type type;
union {
struct token token;
struct ident ident;
struct integer integer;
struct boolean boolean;
struct string string;
struct prefix prefix;
struct infix infix;
struct indexkey indexkey;
};
};
/* if, elif, else branch */
struct branch {
struct token token;
/* if condition is null it means it is an else branch */
struct expression *condition;
struct vector *subblocks;
/* elif or else */
struct branch *next;
};
/* start of if, elif, else */
struct cond {
struct token token;
struct branch *root;
};
/* for loop */
struct loop {
struct token token;
struct ident item;
struct expression *seq;
struct vector *subblocks;
};
/* template block {% block ... %} */
struct tblock {
struct token token;
struct ident name;
struct vector *subblocks;
};
/* {% extends ... %} */
struct parent {
struct token token;
struct string *name;
};
/* {% ... %} blocks */
struct tag {
union {
struct token token;
struct cond cond;
struct loop loop;
struct tblock tblock;
struct parent parent;
};
enum tag_type type;
};
/* {{ ... }} blocks */
struct variable {
struct token token;
struct expression *expression;
};
/* blocks with content that doesn't need evaluation */
struct content {
struct token token;
};
/*
* The template is divided into blocks or chunks which are either plain text
* content, {% %} tags or {{ }} variables. Not to be confused with
* {% block ... %} tags.
*/
struct block {
union {
struct token token;
struct content content;
struct tag tag;
struct variable variable;
};
enum block_type type;
};
/* Root of the AST */
struct template
{
/*
* The name of the template, might be a file name; used to identifiy the
* template in error messages. Will be free'd by template_destroy function
* so a copy should be made if it is needed after destroying the AST.
*/
char *name;
/*
* The source text of the template before parsing. Should be free'd manually
* by the caller of roscha_env_render.
*/
char *source;
/*
* struct that holds references to {% block ... %} tags, for easier/faster
* access to said blocks.
*/
struct hmap *tblocks;
/*
* Holds a child template if there is one. Populated during evaluation,
* NULL'ed after evaluation, since a parent template can have different
* children depending on the context.
*/
struct template *child;
/* vector of blocks */
struct vector *blocks;
};
/* Concatenate to an SDS string a human friendly representation of the node */
sds expression_string(struct expression *, sds str);
sds tag_string(struct tag *, sds str);
sds variable_string(struct variable *, sds str);
sds content_string(struct content *, sds str);
sds block_string(struct block *, sds str);
sds template_string(struct template *, sds str);
/* Free all memory related with the objects */
void branch_destroy(struct branch *);
void tag_destroy(struct tag *);
void expression_destroy(struct expression *);
void block_destroy(struct block *);
void template_destroy(struct template *);
#endif
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