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2517be1 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | #pragma once
#include "utils.h"
#include <cctype>
#include <map>
#include <stdexcept>
#include <string>
#include <vector>
namespace jinja {
struct token {
enum type {
eof, // end of source
text, // The text between Jinja statements or expressions
numeric_literal, // e.g., 123, 1.0
string_literal, // 'string'
identifier, // Variables, functions, statements, booleans, etc.
equals, // =
open_paren, // (
close_paren, // )
open_statement, // {%
close_statement, // %}
open_expression, // {{
close_expression, // }}
open_square_bracket, // [
close_square_bracket, // ]
open_curly_bracket, // {
close_curly_bracket, // }
comma, // ,
dot, // .
colon, // :
pipe, // |
call_operator, // ()
additive_binary_operator, // + - ~
multiplicative_binary_operator, // * / %
comparison_binary_operator, // < > <= >= == !=
unary_operator, // ! - +
comment, // {# ... #}
};
type t;
std::string value;
size_t pos;
};
static std::string type_to_string(token::type t) {
switch (t) {
case token::eof: return "eof";
case token::text: return "text";
case token::numeric_literal: return "numeric_literal";
case token::string_literal: return "string_literal";
case token::identifier: return "identifier";
case token::equals: return "equals";
case token::open_paren: return "open_paren";
case token::close_paren: return "close_paren";
case token::open_statement: return "open_statement";
case token::close_statement: return "close_statement";
case token::open_expression: return "open_expression";
case token::close_expression: return "close_expression";
case token::open_square_bracket: return "open_square_bracket";
case token::close_square_bracket: return "close_square_bracket";
case token::open_curly_bracket: return "open_curly_bracket";
case token::close_curly_bracket: return "close_curly_bracket";
case token::comma: return "comma";
case token::dot: return "dot";
case token::colon: return "colon";
case token::pipe: return "pipe";
case token::call_operator: return "call_operator";
case token::additive_binary_operator: return "additive_binary_operator";
case token::multiplicative_binary_operator: return "multiplicative_binary_operator";
case token::comparison_binary_operator: return "comparison_binary_operator";
case token::unary_operator: return "unary_operator";
case token::comment: return "comment";
default: return "unknown";
}
}
struct lexer_result {
std::vector<token> tokens;
std::string source;
};
struct lexer {
const std::map<char, char> escape_chars = {
{'n', '\n'},
{'t', '\t'},
{'r', '\r'},
{'b', '\b'},
{'f', '\f'},
{'v', '\v'},
{'\\', '\\'},
{'\'', '\''},
{'\"', '\"'},
};
static bool is_word(char c) {
return std::isalnum(static_cast<unsigned char>(c)) || c == '_';
}
static bool is_integer(char c) {
return std::isdigit(static_cast<unsigned char>(c));
}
const std::vector<std::pair<std::string, token::type>> ordered_mapping_table = {
// Trimmed control sequences
{"{%-", token::open_statement},
{"-%}", token::close_statement},
{"{{-", token::open_expression},
{"-}}", token::close_expression},
// Control sequences
{"{%", token::open_statement},
{"%}", token::close_statement},
{"{{", token::open_expression},
{"}}", token::close_expression},
// Single character tokens
{"(", token::open_paren},
{")", token::close_paren},
{"{", token::open_curly_bracket},
{"}", token::close_curly_bracket},
{"[", token::open_square_bracket},
{"]", token::close_square_bracket},
{",", token::comma},
{".", token::dot},
{":", token::colon},
{"|", token::pipe},
// Comparison operators
{"<=", token::comparison_binary_operator},
{">=", token::comparison_binary_operator},
{"==", token::comparison_binary_operator},
{"!=", token::comparison_binary_operator},
{"<", token::comparison_binary_operator},
{">", token::comparison_binary_operator},
// Arithmetic operators
{"+", token::additive_binary_operator},
{"-", token::additive_binary_operator},
{"~", token::additive_binary_operator},
{"*", token::multiplicative_binary_operator},
{"/", token::multiplicative_binary_operator},
{"%", token::multiplicative_binary_operator},
// Assignment operator
{"=", token::equals},
};
// tokenize the source string into a list of tokens
// may throw lexer_exception on error
lexer_result tokenize(const std::string & source);
};
struct lexer_exception : public std::runtime_error {
lexer_exception(const std::string & msg, const std::string & source, size_t pos)
: std::runtime_error(fmt_error_with_source("lexer", msg, source, pos)) {}
};
} // namespace jinja
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