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| 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | 15x 13x 12x 3x 3x 3x 6x 4x 55x 55x 55x 55x 308x 12x 296x 308x 55x | /**
* String utilities for C code generation.
* Pure functions that generate C code strings for string operations.
*
* Extracted from CodeGenerator.ts as part of ADR-109 decomposition.
*/
/** C null terminator character literal for generated code */
const C_NULL_CHAR = String.raw`'\0'`;
class StringUtils {
/**
* Generate strncpy with explicit null termination.
* Used for simple string assignments: str <- "hello"
*
* Pattern: strncpy(target, value, capacity); target[capacity] = '\0';
*
* @param target - The destination variable/expression
* @param value - The source string expression
* @param capacity - Maximum string length (excluding null)
* @returns C code string for the copy operation
*/
static copyWithNull(target: string, value: string, capacity: number): string {
return `strncpy(${target}, ${value}, ${capacity}); ${target}[${capacity}] = ${C_NULL_CHAR};`;
}
/**
* Generate strncpy without explicit null termination.
* Used for string array elements where the buffer is pre-zeroed.
*
* Pattern: strncpy(target, value, capacity);
*
* @param target - The destination expression (may include subscripts)
* @param value - The source string expression
* @param capacity - Maximum string length (excluding null)
* @returns C code string for the copy operation
*/
static copy(target: string, value: string, capacity: number): string {
return `strncpy(${target}, ${value}, ${capacity});`;
}
/**
* Generate string concatenation sequence.
* Used for: result <- left + right
*
* Pattern:
* strncpy(target, left, capacity);
* strncat(target, right, capacity - strlen(target));
* target[capacity] = '\0';
*
* @param target - The destination variable
* @param left - Left operand string expression
* @param right - Right operand string expression
* @param capacity - Maximum string length (excluding null)
* @param indent - Indentation for multi-line output
* @returns Array of C code lines for the concatenation
*/
static concat(
target: string,
left: string,
right: string,
capacity: number,
indent: string = "",
): string[] {
return [
`${indent}strncpy(${target}, ${left}, ${capacity});`,
`${indent}strncat(${target}, ${right}, ${capacity} - strlen(${target}));`,
`${indent}${target}[${capacity}] = ${C_NULL_CHAR};`,
];
}
/**
* Generate substring extraction.
* Used for: result <- source[start, length]
*
* Pattern:
* strncpy(target, source + start, length);
* target[length] = '\0';
*
* @param target - The destination variable
* @param source - Source string expression
* @param start - Starting position expression
* @param length - Length to extract
* @param indent - Indentation for multi-line output
* @returns Array of C code lines for the substring
*/
static substring(
target: string,
source: string,
start: string,
length: number,
indent: string = "",
): string[] {
return [
`${indent}strncpy(${target}, ${source} + ${start}, ${length});`,
`${indent}${target}[${length}] = ${C_NULL_CHAR};`,
];
}
/**
* Generate struct field string copy.
* Used for: config.name <- "value"
*
* @param structName - The struct variable name
* @param fieldName - The field name
* @param value - The source string expression
* @param capacity - Maximum string length (excluding null)
* @returns C code string for the copy operation
*/
static copyToStructField(
structName: string,
fieldName: string,
value: string,
capacity: number,
): string {
return StringUtils.copyWithNull(
`${structName}.${fieldName}`,
value,
capacity,
);
}
/**
* Generate string array element copy.
* Used for: names[i] <- "value"
*
* @param arrayName - The array variable name
* @param index - The array index expression
* @param value - The source string expression
* @param capacity - Maximum string length (excluding null)
* @returns C code string for the copy operation
*/
static copyToArrayElement(
arrayName: string,
index: string,
value: string,
capacity: number,
): string {
return StringUtils.copy(`${arrayName}[${index}]`, value, capacity);
}
/**
* Generate struct field array element string copy.
* Used for: config.names[i] <- "value"
*
* @param structName - The struct variable name
* @param fieldName - The field name
* @param index - The array index expression
* @param value - The source string expression
* @param capacity - Maximum string length (excluding null)
* @returns C code string for the copy operation
*/
static copyToStructFieldArrayElement(
structName: string,
fieldName: string,
index: string,
value: string,
capacity: number,
): string {
return StringUtils.copy(
`${structName}.${fieldName}[${index}]`,
value,
capacity,
);
}
/**
* Get the actual character length of a string literal,
* accounting for escape sequences like \n, \t, \\, etc.
*
* @param literal - The string literal including quotes (e.g., "hello\n")
* @returns The character count (escape sequences count as 1)
*/
static literalLength(literal: string): number {
// Remove surrounding quotes
const content = literal.slice(1, -1);
let length = 0;
let i = 0;
while (i < content.length) {
if (content[i] === "\\" && i + 1 < content.length) {
// Escape sequence counts as 1 character
i += 2;
} else {
i += 1;
}
length += 1;
}
return length;
}
}
export default StringUtils;
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