Function jsonLexer

Convenience function to create a [JsonLexer] and infer the range type.

import std.exception : assertNotThrown;

struct Test {
  string text;
  Token expected;
  bool function(JsonLexer!string) lexerValidator;
}

Test[] tests = [
    Test("null", Token.NULL, (p) => true),
    Test("  true", Token.BOOL, (p) => p.boolValue() == true),
    Test("false ", Token.BOOL, (p) => p.boolValue() == false),
    Test("7", Token.LONG, (p) => p.longValue() == 7),
    Test("-6", Token.LONG, (p) => p.longValue() == -6),
    Test("34.56", Token.DOUBLE, (p) => p.doubleValue() == 34.56),
    Test("-4.567", Token.DOUBLE, (p) => p.doubleValue() == -4.567),
    Test("1.23e20", Token.DOUBLE, (p) => p.doubleValue() == 1.23e20),
    Test("-1.23e+20", Token.DOUBLE, (p) => p.doubleValue() == -1.23e20),
    Test("-1.23e-20", Token.DOUBLE, (p) => p.doubleValue() == -1.23e-20),
    Test("\"b\\t\\u25BDb\"", Token.STRING, (p) => p.rawString() == "b\\t\\u25BDb"),
    Test("\"b\\t\\u25BDb\"", Token.STRING, (p) => p.stringValue() == "b\t▽b"),
  ];
foreach (size_t i, Test test; tests) {
  auto lexer = jsonLexer(test.text);
  assertNotThrown(lexer.expectToken(test.expected), "Invalid token in test " ~ i.to!string);
  assert(test.lexerValidator(lexer), "Lexer invalid in test " ~ i.to!string);
}

auto lexer = jsonLexer(" [\"b[ob\" ,\"h]am\"] ");
lexer.expectToken(Token.ARRAY_START);
lexer.expectToken(Token.STRING);
lexer.expectToken(Token.STRING);
lexer.expectToken(Token.ARRAY_END);

auto lexer = jsonLexer("{\n  \"a\" : \"b[]{}ob\"\n ,\"b\" : \"h{[]}m\"} ");
lexer.expectToken(Token.OBJECT_START);
lexer.expectToken(Token.STRING);
lexer.expectToken(Token.STRING);
lexer.expectToken(Token.STRING);
lexer.expectToken(Token.STRING);
lexer.expectToken(Token.OBJECT_END);

import std.exception : assertThrown;
auto lexer = jsonLexer(" [\"b[ob\" ,\"h]am\"] ");
assertThrown!JsonLexException(lexer.expectToken(Token.OBJECT_START));

auto lexer = jsonLexer("{\n  \"a\" : \"b[]{}ob\"\n ,\"b\" : \"h{[]}m\"} ");
assert(lexer.peek() == Token.OBJECT_START);
assert(lexer.peek() == Token.OBJECT_START);
assert(lexer.advance() == Token.OBJECT_START);
assert(lexer.advance() == Token.STRING);
assert(lexer.advance() == Token.STRING);
assert(lexer.peek() == Token.STRING);
assert(lexer.peek() == Token.STRING);
assert(lexer.advance() == Token.STRING);
assert(lexer.advance() == Token.STRING);
assert(lexer.advance() == Token.OBJECT_END);