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parse.h

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    Damien George authored
    Previously, a failed malloc/realloc would throw an exception, which was
    not caught.  I think it's better to keep the parser free from NLR
    (exception throwing), hence this patch.
    58ba4c3b
    History
    parse.h 3.58 KiB
    struct _mp_lexer_t;
    
    // a mp_parse_node_t is:
    //  - 0000...0000: no node
    //  - xxxx...xxx1: a small integer; bits 1 and above are the signed value, 2's complement
    //  - xxxx...xx00: pointer to mp_parse_node_struct_t
    //  - xx...x00010: an identifier; bits 5 and above are the qstr
    //  - xx...x00110: an integer; bits 5 and above are the qstr holding the value
    //  - xx...x01010: a decimal; bits 5 and above are the qstr holding the value
    //  - xx...x01110: a string; bits 5 and above are the qstr holding the value
    //  - xx...x10010: a string of bytes; bits 5 and above are the qstr holding the value
    //  - xx...x10110: a token; bits 5 and above are mp_token_kind_t
    
    // TODO: these can now be unified with MP_OBJ_FITS_SMALL_INT(x)
    // makes sure the top 2 bits of x are all cleared (positive number) or all set (negavite number)
    // these macros can probably go somewhere else because they are used more than just in the parser
    #define MP_UINT_HIGH_2_BITS (~((~((machine_uint_t)0)) >> 2))
    // parser's small ints are different from VM small int
    #define MP_PARSE_FITS_SMALL_INT(x) (((((machine_uint_t)(x)) & MP_UINT_HIGH_2_BITS) == 0) || ((((machine_uint_t)(x)) & MP_UINT_HIGH_2_BITS) == MP_UINT_HIGH_2_BITS))
    
    #define MP_PARSE_NODE_NULL      (0)
    #define MP_PARSE_NODE_SMALL_INT (0x1)
    #define MP_PARSE_NODE_ID        (0x02)
    #define MP_PARSE_NODE_INTEGER   (0x06)
    #define MP_PARSE_NODE_DECIMAL   (0x0a)
    #define MP_PARSE_NODE_STRING    (0x0e)
    #define MP_PARSE_NODE_BYTES     (0x12)
    #define MP_PARSE_NODE_TOKEN     (0x16)
    
    typedef machine_uint_t mp_parse_node_t; // must be pointer size
    
    typedef struct _mp_parse_node_struct_t {
        uint32_t source_line;       // line number in source file
        uint32_t kind_num_nodes;    // parse node kind, and number of nodes
        mp_parse_node_t nodes[];    // nodes
    } mp_parse_node_struct_t;
    
    // macros for mp_parse_node_t usage
    // some of these evaluate their argument more than once
    
    #define MP_PARSE_NODE_IS_NULL(pn) ((pn) == MP_PARSE_NODE_NULL)
    #define MP_PARSE_NODE_IS_LEAF(pn) ((pn) & 3)
    #define MP_PARSE_NODE_IS_STRUCT(pn) ((pn) != MP_PARSE_NODE_NULL && ((pn) & 3) == 0)
    #define MP_PARSE_NODE_IS_STRUCT_KIND(pn, k) ((pn) != MP_PARSE_NODE_NULL && ((pn) & 3) == 0 && MP_PARSE_NODE_STRUCT_KIND((mp_parse_node_struct_t*)(pn)) == (k))
    
    #define MP_PARSE_NODE_IS_SMALL_INT(pn) (((pn) & 0x1) == MP_PARSE_NODE_SMALL_INT)
    #define MP_PARSE_NODE_IS_ID(pn) (((pn) & 0x1f) == MP_PARSE_NODE_ID)
    #define MP_PARSE_NODE_IS_TOKEN(pn) (((pn) & 0x1f) == MP_PARSE_NODE_TOKEN)
    #define MP_PARSE_NODE_IS_TOKEN_KIND(pn, k) ((pn) == (MP_PARSE_NODE_TOKEN | ((k) << 5)))
    
    #define MP_PARSE_NODE_LEAF_KIND(pn) ((pn) & 0x1f)
    // TODO should probably have int and uint versions of this macro
    #define MP_PARSE_NODE_LEAF_ARG(pn) (((machine_uint_t)(pn)) >> 5)
    #define MP_PARSE_NODE_LEAF_SMALL_INT(pn) (((machine_int_t)(pn)) >> 1)
    #define MP_PARSE_NODE_STRUCT_KIND(pns) ((pns)->kind_num_nodes & 0xff)
    #define MP_PARSE_NODE_STRUCT_NUM_NODES(pns) ((pns)->kind_num_nodes >> 8)
    
    mp_parse_node_t mp_parse_node_new_leaf(machine_int_t kind, machine_int_t arg);
    uint mp_parse_node_free(mp_parse_node_t pn);
    
    void mp_parse_node_print(mp_parse_node_t pn, int indent);
    
    typedef enum {
        MP_PARSE_SINGLE_INPUT,
        MP_PARSE_FILE_INPUT,
        MP_PARSE_EVAL_INPUT,
    } mp_parse_input_kind_t;
    
    typedef enum {
        MP_PARSE_ERROR_MEMORY,
        MP_PARSE_ERROR_UNEXPECTED_INDENT,
        MP_PARSE_ERROR_UNMATCHED_UNINDENT,
        MP_PARSE_ERROR_INVALID_SYNTAX,
    } mp_parse_error_kind_t;
    
    // returns MP_PARSE_NODE_NULL on error, and then parse_error_kind_out is valid
    mp_parse_node_t mp_parse(struct _mp_lexer_t *lex, mp_parse_input_kind_t input_kind, mp_parse_error_kind_t *parse_error_kind_out);