/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { assertEqual, throwError } from '../../util/assert';
// Global state of the parser. (This makes parser non-reentrant, but that is not an issue)
const parserState = {
    textEnd: 0,
    key: 0,
    keyEnd: 0,
    value: 0,
    valueEnd: 0,
};
/**
 * Retrieves the last parsed `key` of style.
 * @param text the text to substring the key from.
 */
export function getLastParsedKey(text) {
    return text.substring(parserState.key, parserState.keyEnd);
}
/**
 * Retrieves the last parsed `value` of style.
 * @param text the text to substring the key from.
 */
export function getLastParsedValue(text) {
    return text.substring(parserState.value, parserState.valueEnd);
}
/**
 * Initializes `className` string for parsing and parses the first token.
 *
 * This function is intended to be used in this format:
 * ```
 * for (let i = parseClassName(text); i >= 0; i = parseClassNameNext(text, i)) {
 *   const key = getLastParsedKey();
 *   ...
 * }
 * ```
 * @param text `className` to parse
 * @returns index where the next invocation of `parseClassNameNext` should resume.
 */
export function parseClassName(text) {
    resetParserState(text);
    return parseClassNameNext(text, consumeWhitespace(text, 0, parserState.textEnd));
}
/**
 * Parses next `className` token.
 *
 * This function is intended to be used in this format:
 * ```
 * for (let i = parseClassName(text); i >= 0; i = parseClassNameNext(text, i)) {
 *   const key = getLastParsedKey();
 *   ...
 * }
 * ```
 *
 * @param text `className` to parse
 * @param index where the parsing should resume.
 * @returns index where the next invocation of `parseClassNameNext` should resume.
 */
export function parseClassNameNext(text, index) {
    const end = parserState.textEnd;
    if (end === index) {
        return -1;
    }
    index = parserState.keyEnd = consumeClassToken(text, parserState.key = index, end);
    return consumeWhitespace(text, index, end);
}
/**
 * Initializes `cssText` string for parsing and parses the first key/values.
 *
 * This function is intended to be used in this format:
 * ```
 * for (let i = parseStyle(text); i >= 0; i = parseStyleNext(text, i))) {
 *   const key = getLastParsedKey();
 *   const value = getLastParsedValue();
 *   ...
 * }
 * ```
 * @param text `cssText` to parse
 * @returns index where the next invocation of `parseStyleNext` should resume.
 */
export function parseStyle(text) {
    resetParserState(text);
    return parseStyleNext(text, consumeWhitespace(text, 0, parserState.textEnd));
}
/**
 * Parses the next `cssText` key/values.
 *
 * This function is intended to be used in this format:
 * ```
 * for (let i = parseStyle(text); i >= 0; i = parseStyleNext(text, i))) {
 *   const key = getLastParsedKey();
 *   const value = getLastParsedValue();
 *   ...
 * }
 *
 * @param text `cssText` to parse
 * @param index where the parsing should resume.
 * @returns index where the next invocation of `parseStyleNext` should resume.
 */
export function parseStyleNext(text, startIndex) {
    const end = parserState.textEnd;
    let index = parserState.key = consumeWhitespace(text, startIndex, end);
    if (end === index) {
        // we reached an end so just quit
        return -1;
    }
    index = parserState.keyEnd = consumeStyleKey(text, index, end);
    index = consumeSeparator(text, index, end, 58 /* CharCode.COLON */);
    index = parserState.value = consumeWhitespace(text, index, end);
    index = parserState.valueEnd = consumeStyleValue(text, index, end);
    return consumeSeparator(text, index, end, 59 /* CharCode.SEMI_COLON */);
}
/**
 * Reset the global state of the styling parser.
 * @param text The styling text to parse.
 */
export function resetParserState(text) {
    parserState.key = 0;
    parserState.keyEnd = 0;
    parserState.value = 0;
    parserState.valueEnd = 0;
    parserState.textEnd = text.length;
}
/**
 * Returns index of next non-whitespace character.
 *
 * @param text Text to scan
 * @param startIndex Starting index of character where the scan should start.
 * @param endIndex Ending index of character where the scan should end.
 * @returns Index of next non-whitespace character (May be the same as `start` if no whitespace at
 *          that location.)
 */
export function consumeWhitespace(text, startIndex, endIndex) {
    while (startIndex < endIndex && text.charCodeAt(startIndex) <= 32 /* CharCode.SPACE */) {
        startIndex++;
    }
    return startIndex;
}
/**
 * Returns index of last char in class token.
 *
 * @param text Text to scan
 * @param startIndex Starting index of character where the scan should start.
 * @param endIndex Ending index of character where the scan should end.
 * @returns Index after last char in class token.
 */
export function consumeClassToken(text, startIndex, endIndex) {
    while (startIndex < endIndex && text.charCodeAt(startIndex) > 32 /* CharCode.SPACE */) {
        startIndex++;
    }
    return startIndex;
}
/**
 * Consumes all of the characters belonging to style key and token.
 *
 * @param text Text to scan
 * @param startIndex Starting index of character where the scan should start.
 * @param endIndex Ending index of character where the scan should end.
 * @returns Index after last style key character.
 */
export function consumeStyleKey(text, startIndex, endIndex) {
    let ch;
    while (startIndex < endIndex &&
        ((ch = text.charCodeAt(startIndex)) === 45 /* CharCode.DASH */ || ch === 95 /* CharCode.UNDERSCORE */ ||
            ((ch & -33 /* CharCode.UPPER_CASE */) >= 65 /* CharCode.A */ && (ch & -33 /* CharCode.UPPER_CASE */) <= 90 /* CharCode.Z */) ||
            (ch >= 48 /* CharCode.ZERO */ && ch <= 57 /* CharCode.NINE */))) {
        startIndex++;
    }
    return startIndex;
}
/**
 * Consumes all whitespace and the separator `:` after the style key.
 *
 * @param text Text to scan
 * @param startIndex Starting index of character where the scan should start.
 * @param endIndex Ending index of character where the scan should end.
 * @returns Index after separator and surrounding whitespace.
 */
export function consumeSeparator(text, startIndex, endIndex, separator) {
    startIndex = consumeWhitespace(text, startIndex, endIndex);
    if (startIndex < endIndex) {
        if (ngDevMode && text.charCodeAt(startIndex) !== separator) {
            malformedStyleError(text, String.fromCharCode(separator), startIndex);
        }
        startIndex++;
    }
    return startIndex;
}
/**
 * Consumes style value honoring `url()` and `""` text.
 *
 * @param text Text to scan
 * @param startIndex Starting index of character where the scan should start.
 * @param endIndex Ending index of character where the scan should end.
 * @returns Index after last style value character.
 */
export function consumeStyleValue(text, startIndex, endIndex) {
    let ch1 = -1; // 1st previous character
    let ch2 = -1; // 2nd previous character
    let ch3 = -1; // 3rd previous character
    let i = startIndex;
    let lastChIndex = i;
    while (i < endIndex) {
        const ch = text.charCodeAt(i++);
        if (ch === 59 /* CharCode.SEMI_COLON */) {
            return lastChIndex;
        }
        else if (ch === 34 /* CharCode.DOUBLE_QUOTE */ || ch === 39 /* CharCode.SINGLE_QUOTE */) {
            lastChIndex = i = consumeQuotedText(text, ch, i, endIndex);
        }
        else if (startIndex ===
            i - 4 && // We have seen only 4 characters so far "URL(" (Ignore "foo_URL()")
            ch3 === 85 /* CharCode.U */ &&
            ch2 === 82 /* CharCode.R */ && ch1 === 76 /* CharCode.L */ && ch === 40 /* CharCode.OPEN_PAREN */) {
            lastChIndex = i = consumeQuotedText(text, 41 /* CharCode.CLOSE_PAREN */, i, endIndex);
        }
        else if (ch > 32 /* CharCode.SPACE */) {
            // if we have a non-whitespace character then capture its location
            lastChIndex = i;
        }
        ch3 = ch2;
        ch2 = ch1;
        ch1 = ch & -33 /* CharCode.UPPER_CASE */;
    }
    return lastChIndex;
}
/**
 * Consumes all of the quoted characters.
 *
 * @param text Text to scan
 * @param quoteCharCode CharCode of either `"` or `'` quote or `)` for `url(...)`.
 * @param startIndex Starting index of character where the scan should start.
 * @param endIndex Ending index of character where the scan should end.
 * @returns Index after quoted characters.
 */
export function consumeQuotedText(text, quoteCharCode, startIndex, endIndex) {
    let ch1 = -1; // 1st previous character
    let index = startIndex;
    while (index < endIndex) {
        const ch = text.charCodeAt(index++);
        if (ch == quoteCharCode && ch1 !== 92 /* CharCode.BACK_SLASH */) {
            return index;
        }
        if (ch == 92 /* CharCode.BACK_SLASH */ && ch1 === 92 /* CharCode.BACK_SLASH */) {
            // two back slashes cancel each other out. For example `"\\"` should properly end the
            // quotation. (It should not assume that the last `"` is escaped.)
            ch1 = 0;
        }
        else {
            ch1 = ch;
        }
    }
    throw ngDevMode ? malformedStyleError(text, String.fromCharCode(quoteCharCode), endIndex) :
        new Error();
}
function malformedStyleError(text, expecting, index) {
    ngDevMode && assertEqual(typeof text === 'string', true, 'String expected here');
    throw throwError(`Malformed style at location ${index} in string '` + text.substring(0, index) + '[>>' +
        text.substring(index, index + 1) + '<<]' + text.slice(index + 1) +
        `'. Expecting '${expecting}'.`);
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {assertEqual, throwError} from '../../util/assert';\nimport {CharCode} from '../../util/char_code';\n\n/**\n * Stores the locations of key/value indexes while parsing styling.\n *\n * In case of `cssText` parsing the indexes are like so:\n * ```\n *   \"key1: value1; key2: value2; key3: value3\"\n *                  ^   ^ ^     ^             ^\n *                  |   | |     |             +-- textEnd\n *                  |   | |     +---------------- valueEnd\n *                  |   | +---------------------- value\n *                  |   +------------------------ keyEnd\n *                  +---------------------------- key\n * ```\n *\n * In case of `className` parsing the indexes are like so:\n * ```\n *   \"key1 key2 key3\"\n *         ^   ^    ^\n *         |   |    +-- textEnd\n *         |   +------------------------ keyEnd\n *         +---------------------------- key\n * ```\n * NOTE: `value` and `valueEnd` are used only for styles, not classes.\n */\ninterface ParserState {\n  textEnd: number;\n  key: number;\n  keyEnd: number;\n  value: number;\n  valueEnd: number;\n}\n// Global state of the parser. (This makes parser non-reentrant, but that is not an issue)\nconst parserState: ParserState = {\n  textEnd: 0,\n  key: 0,\n  keyEnd: 0,\n  value: 0,\n  valueEnd: 0,\n};\n\n/**\n * Retrieves the last parsed `key` of style.\n * @param text the text to substring the key from.\n */\nexport function getLastParsedKey(text: string): string {\n  return text.substring(parserState.key, parserState.keyEnd);\n}\n\n/**\n * Retrieves the last parsed `value` of style.\n * @param text the text to substring the key from.\n */\nexport function getLastParsedValue(text: string): string {\n  return text.substring(parserState.value, parserState.valueEnd);\n}\n\n/**\n * Initializes `className` string for parsing and parses the first token.\n *\n * This function is intended to be used in this format:\n * ```\n * for (let i = parseClassName(text); i >= 0; i = parseClassNameNext(text, i)) {\n *   const key = getLastParsedKey();\n *   ...\n * }\n * ```\n * @param text `className` to parse\n * @returns index where the next invocation of `parseClassNameNext` should resume.\n */\nexport function parseClassName(text: string): number {\n  resetParserState(text);\n  return parseClassNameNext(text, consumeWhitespace(text, 0, parserState.textEnd));\n}\n\n/**\n * Parses next `className` token.\n *\n * This function is intended to be used in this format:\n * ```\n * for (let i = parseClassName(text); i >= 0; i = parseClassNameNext(text, i)) {\n *   const key = getLastParsedKey();\n *   ...\n * }\n * ```\n *\n * @param text `className` to parse\n * @param index where the parsing should resume.\n * @returns index where the next invocation of `parseClassNameNext` should resume.\n */\nexport function parseClassNameNext(text: string, index: number): number {\n  const end = parserState.textEnd;\n  if (end === index) {\n    return -1;\n  }\n  index = parserState.keyEnd = consumeClassToken(text, parserState.key = index, end);\n  return consumeWhitespace(text, index, end);\n}\n\n/**\n * Initializes `cssText` string for parsing and parses the first key/values.\n *\n * This function is intended to be used in this format:\n * ```\n * for (let i = parseStyle(text); i >= 0; i = parseStyleNext(text, i))) {\n *   const key = getLastParsedKey();\n *   const value = getLastParsedValue();\n *   ...\n * }\n * ```\n * @param text `cssText` to parse\n * @returns index where the next invocation of `parseStyleNext` should resume.\n */\nexport function parseStyle(text: string): number {\n  resetParserState(text);\n  return parseStyleNext(text, consumeWhitespace(text, 0, parserState.textEnd));\n}\n\n/**\n * Parses the next `cssText` key/values.\n *\n * This function is intended to be used in this format:\n * ```\n * for (let i = parseStyle(text); i >= 0; i = parseStyleNext(text, i))) {\n *   const key = getLastParsedKey();\n *   const value = getLastParsedValue();\n *   ...\n * }\n *\n * @param text `cssText` to parse\n * @param index where the parsing should resume.\n * @returns index where the next invocation of `parseStyleNext` should resume.\n */\nexport function parseStyleNext(text: string, startIndex: number): number {\n  const end = parserState.textEnd;\n  let index = parserState.key = consumeWhitespace(text, startIndex, end);\n  if (end === index) {\n    // we reached an end so just quit\n    return -1;\n  }\n  index = parserState.keyEnd = consumeStyleKey(text, index, end);\n  index = consumeSeparator(text, index, end, CharCode.COLON);\n  index = parserState.value = consumeWhitespace(text, index, end);\n  index = parserState.valueEnd = consumeStyleValue(text, index, end);\n  return consumeSeparator(text, index, end, CharCode.SEMI_COLON);\n}\n\n/**\n * Reset the global state of the styling parser.\n * @param text The styling text to parse.\n */\nexport function resetParserState(text: string): void {\n  parserState.key = 0;\n  parserState.keyEnd = 0;\n  parserState.value = 0;\n  parserState.valueEnd = 0;\n  parserState.textEnd = text.length;\n}\n\n/**\n * Returns index of next non-whitespace character.\n *\n * @param text Text to scan\n * @param startIndex Starting index of character where the scan should start.\n * @param endIndex Ending index of character where the scan should end.\n * @returns Index of next non-whitespace character (May be the same as `start` if no whitespace at\n *          that location.)\n */\nexport function consumeWhitespace(text: string, startIndex: number, endIndex: number): number {\n  while (startIndex < endIndex && text.charCodeAt(startIndex) <= CharCode.SPACE) {\n    startIndex++;\n  }\n  return startIndex;\n}\n\n/**\n * Returns index of last char in class token.\n *\n * @param text Text to scan\n * @param startIndex Starting index of character where the scan should start.\n * @param endIndex Ending index of character where the scan should end.\n * @returns Index after last char in class token.\n */\nexport function consumeClassToken(text: string, startIndex: number, endIndex: number): number {\n  while (startIndex < endIndex && text.charCodeAt(startIndex) > CharCode.SPACE) {\n    startIndex++;\n  }\n  return startIndex;\n}\n\n/**\n * Consumes all of the characters belonging to style key and token.\n *\n * @param text Text to scan\n * @param startIndex Starting index of character where the scan should start.\n * @param endIndex Ending index of character where the scan should end.\n * @returns Index after last style key character.\n */\nexport function consumeStyleKey(text: string, startIndex: number, endIndex: number): number {\n  let ch: number;\n  while (startIndex < endIndex &&\n         ((ch = text.charCodeAt(startIndex)) === CharCode.DASH || ch === CharCode.UNDERSCORE ||\n          ((ch & CharCode.UPPER_CASE) >= CharCode.A && (ch & CharCode.UPPER_CASE) <= CharCode.Z) ||\n          (ch >= CharCode.ZERO && ch <= CharCode.NINE))) {\n    startIndex++;\n  }\n  return startIndex;\n}\n\n/**\n * Consumes all whitespace and the separator `:` after the style key.\n *\n * @param text Text to scan\n * @param startIndex Starting index of character where the scan should start.\n * @param endIndex Ending index of character where the scan should end.\n * @returns Index after separator and surrounding whitespace.\n */\nexport function consumeSeparator(\n    text: string, startIndex: number, endIndex: number, separator: number): number {\n  startIndex = consumeWhitespace(text, startIndex, endIndex);\n  if (startIndex < endIndex) {\n    if (ngDevMode && text.charCodeAt(startIndex) !== separator) {\n      malformedStyleError(text, String.fromCharCode(separator), startIndex);\n    }\n    startIndex++;\n  }\n  return startIndex;\n}\n\n\n/**\n * Consumes style value honoring `url()` and `\"\"` text.\n *\n * @param text Text to scan\n * @param startIndex Starting index of character where the scan should start.\n * @param endIndex Ending index of character where the scan should end.\n * @returns Index after last style value character.\n */\nexport function consumeStyleValue(text: string, startIndex: number, endIndex: number): number {\n  let ch1 = -1;  // 1st previous character\n  let ch2 = -1;  // 2nd previous character\n  let ch3 = -1;  // 3rd previous character\n  let i = startIndex;\n  let lastChIndex = i;\n  while (i < endIndex) {\n    const ch: number = text.charCodeAt(i++);\n    if (ch === CharCode.SEMI_COLON) {\n      return lastChIndex;\n    } else if (ch === CharCode.DOUBLE_QUOTE || ch === CharCode.SINGLE_QUOTE) {\n      lastChIndex = i = consumeQuotedText(text, ch, i, endIndex);\n    } else if (\n        startIndex ===\n            i - 4 &&  // We have seen only 4 characters so far \"URL(\" (Ignore \"foo_URL()\")\n        ch3 === CharCode.U &&\n        ch2 === CharCode.R && ch1 === CharCode.L && ch === CharCode.OPEN_PAREN) {\n      lastChIndex = i = consumeQuotedText(text, CharCode.CLOSE_PAREN, i, endIndex);\n    } else if (ch > CharCode.SPACE) {\n      // if we have a non-whitespace character then capture its location\n      lastChIndex = i;\n    }\n    ch3 = ch2;\n    ch2 = ch1;\n    ch1 = ch & CharCode.UPPER_CASE;\n  }\n  return lastChIndex;\n}\n\n/**\n * Consumes all of the quoted characters.\n *\n * @param text Text to scan\n * @param quoteCharCode CharCode of either `\"` or `'` quote or `)` for `url(...)`.\n * @param startIndex Starting index of character where the scan should start.\n * @param endIndex Ending index of character where the scan should end.\n * @returns Index after quoted characters.\n */\nexport function consumeQuotedText(\n    text: string, quoteCharCode: number, startIndex: number, endIndex: number): number {\n  let ch1 = -1;  // 1st previous character\n  let index = startIndex;\n  while (index < endIndex) {\n    const ch = text.charCodeAt(index++);\n    if (ch == quoteCharCode && ch1 !== CharCode.BACK_SLASH) {\n      return index;\n    }\n    if (ch == CharCode.BACK_SLASH && ch1 === CharCode.BACK_SLASH) {\n      // two back slashes cancel each other out. For example `\"\\\\\"` should properly end the\n      // quotation. (It should not assume that the last `\"` is escaped.)\n      ch1 = 0;\n    } else {\n      ch1 = ch;\n    }\n  }\n  throw ngDevMode ? malformedStyleError(text, String.fromCharCode(quoteCharCode), endIndex) :\n                    new Error();\n}\n\nfunction malformedStyleError(text: string, expecting: string, index: number): never {\n  ngDevMode && assertEqual(typeof text === 'string', true, 'String expected here');\n  throw throwError(\n      `Malformed style at location ${index} in string '` + text.substring(0, index) + '[>>' +\n      text.substring(index, index + 1) + '<<]' + text.slice(index + 1) +\n      `'. Expecting '${expecting}'.`);\n}\n"]}